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Commit | Line | Data |
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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
1d52bdf7 | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
9d257a2a | 6 | #include <arpa/inet.h> |
8f3e280e CB |
7 | #include <dirent.h> |
8 | #include <errno.h> | |
9 | #include <fcntl.h> | |
10 | #include <grp.h> | |
11 | #include <inttypes.h> | |
12 | #include <libgen.h> | |
9d257a2a CB |
13 | #include <linux/loop.h> |
14 | #include <net/if.h> | |
15 | #include <netinet/in.h> | |
8f3e280e CB |
16 | #include <pwd.h> |
17 | #include <stdarg.h> | |
1b82d721 | 18 | #include <stdbool.h> |
0ad19a3f | 19 | #include <stdio.h> |
0ad19a3f | 20 | #include <stdlib.h> |
0ad19a3f | 21 | #include <string.h> |
8f3e280e CB |
22 | #include <sys/mman.h> |
23 | #include <sys/mount.h> | |
24 | #include <sys/param.h> | |
25 | #include <sys/prctl.h> | |
6a49f05e | 26 | #include <sys/sendfile.h> |
8f3e280e | 27 | #include <sys/socket.h> |
9d257a2a | 28 | #include <sys/stat.h> |
2d76d1d7 | 29 | #include <sys/syscall.h> |
9d257a2a | 30 | #include <sys/sysmacros.h> |
97e9cfa0 | 31 | #include <sys/types.h> |
8f3e280e CB |
32 | #include <sys/utsname.h> |
33 | #include <sys/wait.h> | |
9d257a2a CB |
34 | #include <time.h> |
35 | #include <unistd.h> | |
1d52bdf7 | 36 | |
d38dd64a CB |
37 | #include "af_unix.h" |
38 | #include "caps.h" | |
5f126977 | 39 | #include "cgroups/cgroup.h" |
52ce8504 | 40 | #include "compiler.h" |
d38dd64a CB |
41 | #include "conf.h" |
42 | #include "config.h" | |
43 | #include "confile.h" | |
44 | #include "confile_utils.h" | |
45 | #include "error.h" | |
46 | #include "log.h" | |
47 | #include "lsm/lsm.h" | |
48 | #include "lxclock.h" | |
49 | #include "lxcseccomp.h" | |
50 | #include "macro.h" | |
2f443e88 | 51 | #include "memory_utils.h" |
7f88a1a2 | 52 | #include "mount_utils.h" |
d38dd64a CB |
53 | #include "namespace.h" |
54 | #include "network.h" | |
55 | #include "parse.h" | |
f40988c7 | 56 | #include "process_utils.h" |
d38dd64a CB |
57 | #include "ringbuf.h" |
58 | #include "start.h" | |
5f126977 | 59 | #include "storage/storage.h" |
d38dd64a | 60 | #include "storage/overlay.h" |
1b82d721 | 61 | #include "sync.h" |
6b3d24d7 | 62 | #include "syscall_wrappers.h" |
d38dd64a CB |
63 | #include "terminal.h" |
64 | #include "utils.h" | |
20502652 | 65 | #include "uuid.h" |
d38dd64a | 66 | |
af6824fc | 67 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 68 | #include <sys/mkdev.h> |
af6824fc | 69 | #endif |
af6824fc | 70 | |
614305f3 | 71 | #ifdef HAVE_STATVFS |
2938f7c8 | 72 | #include <sys/statvfs.h> |
614305f3 | 73 | #endif |
e827ff7e | 74 | |
35eb5cdc | 75 | #if HAVE_OPENPTY |
b0a33c1e | 76 | #include <pty.h> |
e827ff7e SG |
77 | #else |
78 | #include <../include/openpty.h> | |
79 | #endif | |
0ad19a3f | 80 | |
9d257a2a CB |
81 | #if HAVE_LIBCAP |
82 | #include <sys/capability.h> | |
83 | #endif | |
84 | ||
f1e05b90 DJ |
85 | #ifndef HAVE_STRLCAT |
86 | #include "include/strlcat.h" | |
87 | #endif | |
88 | ||
9d257a2a CB |
89 | #if IS_BIONIC |
90 | #include <../include/lxcmntent.h> | |
91 | #else | |
92 | #include <mntent.h> | |
93 | #endif | |
94 | ||
95 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
96 | #include <../include/prlimit.h> | |
97 | #endif | |
98 | ||
f6815906 CB |
99 | #ifndef HAVE_STRLCPY |
100 | #include "include/strlcpy.h" | |
101 | #endif | |
102 | ||
60933dae CB |
103 | #ifndef HAVE_STRCHRNUL |
104 | #include "include/strchrnul.h" | |
105 | #endif | |
106 | ||
ac2cecc4 | 107 | lxc_log_define(conf, lxc); |
e5bda9ee | 108 | |
52ce8504 CB |
109 | /* |
110 | * The lxc_conf of the container currently being worked on in an API call. | |
0fd73091 CB |
111 | * This is used in the error calls. |
112 | */ | |
d7f19646 | 113 | thread_local struct lxc_conf *current_config; |
8912711c | 114 | |
0fd73091 CB |
115 | char *lxchook_names[NUM_LXC_HOOKS] = { |
116 | "pre-start", | |
117 | "pre-mount", | |
118 | "mount", | |
119 | "autodev", | |
120 | "start", | |
121 | "stop", | |
122 | "post-stop", | |
123 | "clone", | |
124 | "destroy", | |
125 | "start-host" | |
126 | }; | |
72d0e1cb | 127 | |
998ac676 RT |
128 | struct mount_opt { |
129 | char *name; | |
130 | int clear; | |
1b82d721 CB |
131 | bool recursive; |
132 | __u64 flag; | |
1e4bce2c | 133 | int legacy_flag; |
998ac676 RT |
134 | }; |
135 | ||
81810dd1 DL |
136 | struct caps_opt { |
137 | char *name; | |
138 | int value; | |
139 | }; | |
140 | ||
c6d09e15 WB |
141 | struct limit_opt { |
142 | char *name; | |
143 | int value; | |
144 | }; | |
145 | ||
998ac676 | 146 | static struct mount_opt mount_opt[] = { |
1b82d721 CB |
147 | { "atime", 1, false, MOUNT_ATTR_NOATIME, MS_NOATIME }, |
148 | { "dev", 1, false, MOUNT_ATTR_NODEV, MS_NODEV }, | |
149 | { "diratime", 1, false, MOUNT_ATTR_NODIRATIME, MS_NODIRATIME }, | |
150 | { "exec", 1, false, MOUNT_ATTR_NOEXEC, MS_NOEXEC }, | |
151 | { "noatime", 0, false, MOUNT_ATTR_NOATIME, MS_NOATIME }, | |
152 | { "nodev", 0, false, MOUNT_ATTR_NODEV, MS_NODEV }, | |
153 | { "nodiratime", 0, false, MOUNT_ATTR_NODIRATIME, MS_NODIRATIME }, | |
154 | { "noexec", 0, false, MOUNT_ATTR_NOEXEC, MS_NOEXEC }, | |
155 | { "norelatime", 1, false, MOUNT_ATTR_RELATIME, MS_RELATIME }, | |
156 | { "nostrictatime", 1, false, MOUNT_ATTR_STRICTATIME, MS_STRICTATIME }, | |
157 | { "nosuid", 0, false, MOUNT_ATTR_NOSUID, MS_NOSUID }, | |
158 | { "relatime", 0, false, MOUNT_ATTR_RELATIME, MS_RELATIME }, | |
159 | { "ro", 0, false, MOUNT_ATTR_RDONLY, MS_RDONLY }, | |
160 | { "rw", 1, false, MOUNT_ATTR_RDONLY, MS_RDONLY }, | |
161 | { "strictatime", 0, false, MOUNT_ATTR_STRICTATIME, MS_STRICTATIME }, | |
162 | { "suid", 1, false, MOUNT_ATTR_NOSUID, MS_NOSUID }, | |
163 | ||
164 | { "bind", 0, false, 0, MS_BIND }, | |
165 | { "defaults", 0, false, 0, 0 }, | |
166 | { "rbind", 0, true, 0, MS_BIND | MS_REC }, | |
167 | ||
168 | { "sync", 0, false, ~0, MS_SYNCHRONOUS }, | |
169 | { "async", 1, false, ~0, MS_SYNCHRONOUS }, | |
170 | { "dirsync", 0, false, ~0, MS_DIRSYNC }, | |
171 | { "lazytime", 0, false, ~0, MS_LAZYTIME }, | |
172 | { "mand", 0, false, ~0, MS_MANDLOCK }, | |
173 | { "nomand", 1, false, ~0, MS_MANDLOCK }, | |
174 | { "remount", 0, false, ~0, MS_REMOUNT }, | |
175 | ||
176 | { NULL, 0, false, ~0, ~0 }, | |
998ac676 RT |
177 | }; |
178 | ||
d840039e | 179 | static struct mount_opt propagation_opt[] = { |
1b82d721 CB |
180 | { "private", 0, false, MS_PRIVATE, MS_PRIVATE }, |
181 | { "shared", 0, false, MS_SHARED, MS_SHARED }, | |
182 | { "slave", 0, false, MS_SLAVE, MS_SLAVE }, | |
183 | { "unbindable", 0, false, MS_UNBINDABLE, MS_UNBINDABLE }, | |
184 | { "rprivate", 0, true, MS_PRIVATE, MS_PRIVATE | MS_REC }, | |
185 | { "rshared", 0, true, MS_SHARED, MS_SHARED | MS_REC }, | |
186 | { "rslave", 0, true, MS_SLAVE, MS_SLAVE | MS_REC }, | |
187 | { "runbindable", 0, true, MS_UNBINDABLE, MS_UNBINDABLE | MS_REC }, | |
188 | { NULL, 0, 0 }, | |
d840039e YT |
189 | }; |
190 | ||
81810dd1 | 191 | static struct caps_opt caps_opt[] = { |
8560cd36 | 192 | #if HAVE_LIBCAP |
7b4cd468 CB |
193 | { "chown", CAP_CHOWN }, |
194 | { "dac_override", CAP_DAC_OVERRIDE }, | |
195 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
196 | { "fowner", CAP_FOWNER }, | |
197 | { "fsetid", CAP_FSETID }, | |
198 | { "kill", CAP_KILL }, | |
199 | { "setgid", CAP_SETGID }, | |
200 | { "setuid", CAP_SETUID }, | |
201 | { "setpcap", CAP_SETPCAP }, | |
202 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
203 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
204 | { "net_broadcast", CAP_NET_BROADCAST }, | |
205 | { "net_admin", CAP_NET_ADMIN }, | |
206 | { "net_raw", CAP_NET_RAW }, | |
207 | { "ipc_lock", CAP_IPC_LOCK }, | |
208 | { "ipc_owner", CAP_IPC_OWNER }, | |
209 | { "sys_module", CAP_SYS_MODULE }, | |
210 | { "sys_rawio", CAP_SYS_RAWIO }, | |
211 | { "sys_chroot", CAP_SYS_CHROOT }, | |
212 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
213 | { "sys_pacct", CAP_SYS_PACCT }, | |
214 | { "sys_admin", CAP_SYS_ADMIN }, | |
215 | { "sys_boot", CAP_SYS_BOOT }, | |
216 | { "sys_nice", CAP_SYS_NICE }, | |
217 | { "sys_resource", CAP_SYS_RESOURCE }, | |
218 | { "sys_time", CAP_SYS_TIME }, | |
219 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
220 | { "mknod", CAP_MKNOD }, | |
221 | { "lease", CAP_LEASE }, | |
222 | { "audit_write", CAP_AUDIT_WRITE }, | |
223 | { "audit_control", CAP_AUDIT_CONTROL }, | |
224 | { "setfcap", CAP_SETFCAP }, | |
225 | { "mac_override", CAP_MAC_OVERRIDE }, | |
226 | { "mac_admin", CAP_MAC_ADMIN }, | |
227 | { "syslog", CAP_SYSLOG }, | |
228 | { "wake_alarm", CAP_WAKE_ALARM }, | |
229 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
230 | { "audit_read", CAP_AUDIT_READ }, | |
231 | { "perfmon", CAP_PERFMON }, | |
232 | { "bpf", CAP_BPF }, | |
233 | { "checkpoint_restore", CAP_CHECKPOINT_RESTORE }, | |
2b54359b | 234 | #endif |
8560cd36 | 235 | }; |
81810dd1 | 236 | |
c6d09e15 WB |
237 | static struct limit_opt limit_opt[] = { |
238 | #ifdef RLIMIT_AS | |
239 | { "as", RLIMIT_AS }, | |
240 | #endif | |
241 | #ifdef RLIMIT_CORE | |
242 | { "core", RLIMIT_CORE }, | |
243 | #endif | |
244 | #ifdef RLIMIT_CPU | |
245 | { "cpu", RLIMIT_CPU }, | |
246 | #endif | |
247 | #ifdef RLIMIT_DATA | |
248 | { "data", RLIMIT_DATA }, | |
249 | #endif | |
250 | #ifdef RLIMIT_FSIZE | |
251 | { "fsize", RLIMIT_FSIZE }, | |
252 | #endif | |
253 | #ifdef RLIMIT_LOCKS | |
254 | { "locks", RLIMIT_LOCKS }, | |
255 | #endif | |
256 | #ifdef RLIMIT_MEMLOCK | |
257 | { "memlock", RLIMIT_MEMLOCK }, | |
258 | #endif | |
259 | #ifdef RLIMIT_MSGQUEUE | |
260 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
261 | #endif | |
262 | #ifdef RLIMIT_NICE | |
263 | { "nice", RLIMIT_NICE }, | |
264 | #endif | |
265 | #ifdef RLIMIT_NOFILE | |
266 | { "nofile", RLIMIT_NOFILE }, | |
267 | #endif | |
268 | #ifdef RLIMIT_NPROC | |
269 | { "nproc", RLIMIT_NPROC }, | |
270 | #endif | |
271 | #ifdef RLIMIT_RSS | |
272 | { "rss", RLIMIT_RSS }, | |
273 | #endif | |
274 | #ifdef RLIMIT_RTPRIO | |
275 | { "rtprio", RLIMIT_RTPRIO }, | |
276 | #endif | |
277 | #ifdef RLIMIT_RTTIME | |
278 | { "rttime", RLIMIT_RTTIME }, | |
279 | #endif | |
280 | #ifdef RLIMIT_SIGPENDING | |
281 | { "sigpending", RLIMIT_SIGPENDING }, | |
282 | #endif | |
283 | #ifdef RLIMIT_STACK | |
284 | { "stack", RLIMIT_STACK }, | |
285 | #endif | |
286 | }; | |
287 | ||
91c3830e SH |
288 | static int run_buffer(char *buffer) |
289 | { | |
cc6a0e78 | 290 | __do_free char *output = NULL; |
55022530 | 291 | __do_lxc_pclose struct lxc_popen_FILE *f = NULL; |
ebf3a6af | 292 | int fd, ret; |
91c3830e | 293 | |
ebec9176 | 294 | f = lxc_popen(buffer); |
55022530 CB |
295 | if (!f) |
296 | return log_error_errno(-1, errno, "Failed to popen() %s", buffer); | |
91c3830e | 297 | |
b8e43ef0 | 298 | output = zalloc(LXC_LOG_BUFFER_SIZE); |
55022530 CB |
299 | if (!output) |
300 | return log_error_errno(-1, ENOMEM, "Failed to allocate memory for %s", buffer); | |
91c3830e | 301 | |
ebf3a6af | 302 | fd = fileno(f->f); |
55022530 CB |
303 | if (fd < 0) |
304 | return log_error_errno(-1, errno, "Failed to retrieve underlying file descriptor"); | |
ebf3a6af CB |
305 | |
306 | for (int i = 0; i < 10; i++) { | |
307 | ssize_t bytes_read; | |
308 | ||
309 | bytes_read = lxc_read_nointr(fd, output, LXC_LOG_BUFFER_SIZE - 1); | |
310 | if (bytes_read > 0) { | |
311 | output[bytes_read] = '\0'; | |
312 | DEBUG("Script %s produced output: %s", buffer, output); | |
313 | continue; | |
314 | } | |
315 | ||
316 | break; | |
317 | } | |
91c3830e | 318 | |
55022530 CB |
319 | ret = lxc_pclose(move_ptr(f)); |
320 | if (ret == -1) | |
321 | return log_error_errno(-1, errno, "Script exited with error"); | |
322 | else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) | |
323 | return log_error(-1, "Script exited with status %d", WEXITSTATUS(ret)); | |
324 | else if (WIFSIGNALED(ret)) | |
325 | return log_error(-1, "Script terminated by signal %d", WTERMSIG(ret)); | |
91c3830e SH |
326 | |
327 | return 0; | |
328 | } | |
329 | ||
14a7b0f9 CB |
330 | int run_script_argv(const char *name, unsigned int hook_version, |
331 | const char *section, const char *script, | |
586b1ce7 | 332 | const char *hookname, char **argv) |
148e91f5 | 333 | { |
e1a94937 | 334 | __do_free char *buffer = NULL; |
3f60c2f7 | 335 | int buf_pos, i, ret; |
d08e5708 | 336 | size_t size = 0; |
148e91f5 | 337 | |
3f60c2f7 | 338 | if (hook_version == 0) |
55022530 CB |
339 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
340 | script, name, section); | |
3f60c2f7 CB |
341 | else |
342 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 343 | |
586b1ce7 CB |
344 | for (i = 0; argv && argv[i]; i++) |
345 | size += strlen(argv[i]) + 1; | |
148e91f5 | 346 | |
6333c915 CB |
347 | size += STRLITERALLEN("exec"); |
348 | size++; | |
148e91f5 | 349 | size += strlen(script); |
3f60c2f7 CB |
350 | size++; |
351 | ||
148e91f5 | 352 | if (size > INT_MAX) |
3f60c2f7 | 353 | return -EFBIG; |
148e91f5 | 354 | |
3f60c2f7 | 355 | if (hook_version == 0) { |
d08e5708 CB |
356 | size += strlen(hookname); |
357 | size++; | |
358 | ||
359 | size += strlen(name); | |
360 | size++; | |
361 | ||
362 | size += strlen(section); | |
363 | size++; | |
364 | ||
365 | if (size > INT_MAX) | |
366 | return -EFBIG; | |
327cce76 | 367 | } |
3f60c2f7 | 368 | |
b8e43ef0 | 369 | buffer = zalloc(size); |
6f8d00d2 CB |
370 | if (!buffer) |
371 | return -ENOMEM; | |
372 | ||
327cce76 | 373 | if (hook_version == 0) |
9bcde680 | 374 | buf_pos = strnprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 375 | else |
9bcde680 CB |
376 | buf_pos = strnprintf(buffer, size, "exec %s", script); |
377 | if (buf_pos < 0) | |
55022530 | 378 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); |
3f60c2f7 | 379 | |
327cce76 | 380 | if (hook_version == 1) { |
3f60c2f7 CB |
381 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
382 | if (ret < 0) { | |
55022530 | 383 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 | 384 | } |
90f20466 | 385 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
386 | |
387 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
55022530 CB |
388 | if (ret < 0) |
389 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_SECTION=%s", section); | |
3f60c2f7 | 390 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); |
14a7b0f9 | 391 | |
71528742 | 392 | if (strequal(section, "net")) { |
14a7b0f9 CB |
393 | char *parent; |
394 | ||
586b1ce7 | 395 | if (!argv || !argv[0]) |
e1a94937 | 396 | return -1; |
14a7b0f9 | 397 | |
586b1ce7 | 398 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
55022530 CB |
399 | if (ret < 0) |
400 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_TYPE=%s", argv[0]); | |
586b1ce7 | 401 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 402 | |
586b1ce7 | 403 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 404 | |
71528742 | 405 | if (strequal(argv[0], "macvlan")) { |
14a7b0f9 | 406 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
407 | if (ret < 0) |
408 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 409 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
71528742 | 410 | } else if (strequal(argv[0], "phys")) { |
14a7b0f9 | 411 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
412 | if (ret < 0) |
413 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 414 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
71528742 | 415 | } else if (strequal(argv[0], "veth")) { |
586b1ce7 | 416 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
417 | |
418 | ret = setenv("LXC_NET_PEER", peer, 1); | |
55022530 CB |
419 | if (ret < 0) |
420 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PEER=%s", peer); | |
14a7b0f9 CB |
421 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); |
422 | ||
423 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
55022530 CB |
424 | if (ret < 0) |
425 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 CB |
426 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
427 | } | |
428 | } | |
148e91f5 SH |
429 | } |
430 | ||
586b1ce7 | 431 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
432 | size_t len = size - buf_pos; |
433 | ||
9bcde680 CB |
434 | ret = strnprintf(buffer + buf_pos, len, " %s", argv[i]); |
435 | if (ret < 0) | |
55022530 | 436 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); |
3f60c2f7 | 437 | buf_pos += ret; |
148e91f5 SH |
438 | } |
439 | ||
e1a94937 | 440 | return run_buffer(buffer); |
148e91f5 SH |
441 | } |
442 | ||
811ef482 | 443 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 444 | { |
2f443e88 | 445 | __do_free char *buffer = NULL; |
abbfd20b | 446 | int ret; |
2f443e88 | 447 | char *p; |
abbfd20b | 448 | va_list ap; |
0fd73091 | 449 | size_t size = 0; |
751d9dcd | 450 | |
0fd73091 | 451 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 452 | script, name, section); |
e3b4c4c4 | 453 | |
abbfd20b DL |
454 | va_start(ap, script); |
455 | while ((p = va_arg(ap, char *))) | |
95642a10 | 456 | size += strlen(p) + 1; |
abbfd20b DL |
457 | va_end(ap); |
458 | ||
6333c915 | 459 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
460 | size += strlen(script); |
461 | size += strlen(name); | |
462 | size += strlen(section); | |
6d1a5f93 | 463 | size += 4; |
abbfd20b | 464 | |
95642a10 MS |
465 | if (size > INT_MAX) |
466 | return -1; | |
467 | ||
2f443e88 | 468 | buffer = must_realloc(NULL, size); |
9bcde680 CB |
469 | ret = strnprintf(buffer, size, "exec %s %s %s", script, name, section); |
470 | if (ret < 0) | |
9ba8130c | 471 | return -1; |
751d9dcd | 472 | |
abbfd20b | 473 | va_start(ap, script); |
9ba8130c | 474 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 475 | int len = size - ret; |
9ba8130c | 476 | int rc; |
9bcde680 CB |
477 | rc = strnprintf(buffer + ret, len, " %s", p); |
478 | if (rc < 0) { | |
7b5a2435 | 479 | va_end(ap); |
9ba8130c | 480 | return -1; |
7b5a2435 | 481 | } |
9ba8130c SH |
482 | ret += rc; |
483 | } | |
abbfd20b | 484 | va_end(ap); |
751d9dcd | 485 | |
91c3830e | 486 | return run_buffer(buffer); |
e3b4c4c4 ST |
487 | } |
488 | ||
4e86cad3 CB |
489 | int lxc_storage_prepare(struct lxc_conf *conf) |
490 | { | |
491 | int ret; | |
492 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
493 | ||
494 | if (!rootfs->path) { | |
495 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); | |
496 | if (ret < 0) | |
497 | return log_error_errno(-1, errno, "Failed to recursively turn root mount tree into dependent mount"); | |
498 | ||
499 | rootfs->dfd_mnt = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); | |
500 | if (rootfs->dfd_mnt < 0) | |
501 | return -errno; | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | ret = access(rootfs->mount, F_OK); | |
507 | if (ret != 0) | |
508 | return log_error_errno(-1, errno, "Failed to access to \"%s\". Check it is present", | |
509 | rootfs->mount); | |
510 | ||
511 | rootfs->storage = storage_init(conf); | |
512 | if (!rootfs->storage) | |
513 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
514 | rootfs->path, rootfs->mount, | |
e73af35b | 515 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
4e86cad3 CB |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
520 | void lxc_storage_put(struct lxc_conf *conf) | |
521 | { | |
522 | storage_put(conf->rootfs.storage); | |
523 | conf->rootfs.storage = NULL; | |
524 | } | |
525 | ||
79ff643d | 526 | /* lxc_rootfs_prepare |
63fc76c3 | 527 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
528 | * the duration of the container run, to prevent the container from marking |
529 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
530 | * no name pollution is happens. |
531 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 | 532 | */ |
239f29c9 | 533 | int lxc_rootfs_init(struct lxc_conf *conf, bool userns) |
0c547523 | 534 | { |
1b82d721 | 535 | __do_close int dfd_path = -EBADF, fd_pin = -EBADF; |
79ff643d CB |
536 | int ret; |
537 | struct stat st; | |
538 | struct statfs stfs; | |
4e86cad3 CB |
539 | struct lxc_rootfs *rootfs = &conf->rootfs; |
540 | ||
541 | ret = lxc_storage_prepare(conf); | |
542 | if (ret) | |
543 | return syserror_set(-EINVAL, "Failed to prepare rootfs storage"); | |
0c547523 | 544 | |
e26cf563 | 545 | if (!is_empty_string(rootfs->mnt_opts.userns_path)) { |
657ed14a CB |
546 | if (!rootfs->path) |
547 | return syserror_set(-EINVAL, "Idmapped rootfs currently only supported with separate rootfs for container"); | |
548 | ||
549 | if (rootfs->bdev_type && !strequal(rootfs->bdev_type, "dir")) | |
550 | return syserror_set(-EINVAL, "Idmapped rootfs currently only supports the \"dir\" storage driver"); | |
e26cf563 CB |
551 | } |
552 | ||
c119f018 CB |
553 | if (!rootfs->path) |
554 | return log_trace(0, "Not pinning because container does not have a rootfs"); | |
e99ee0de | 555 | |
c119f018 CB |
556 | if (userns) |
557 | return log_trace(0, "Not pinning because container runs in user namespace"); | |
79ff643d | 558 | |
c119f018 CB |
559 | if (rootfs->bdev_type) { |
560 | if (strequal(rootfs->bdev_type, "overlay") || | |
561 | strequal(rootfs->bdev_type, "overlayfs")) | |
562 | return log_trace_errno(0, EINVAL, "Not pinning on stacking filesystem"); | |
0c547523 | 563 | |
c119f018 CB |
564 | if (strequal(rootfs->bdev_type, "zfs")) |
565 | return log_trace_errno(0, EINVAL, "Not pinning on ZFS filesystem"); | |
e26cf563 | 566 | } |
79ff643d | 567 | |
c119f018 CB |
568 | dfd_path = open_at(-EBADF, rootfs->path, PROTECT_OPATH_FILE, 0, 0); |
569 | if (dfd_path < 0) | |
570 | return syserror("Failed to open \"%s\"", rootfs->path); | |
571 | ||
79ff643d | 572 | ret = fstat(dfd_path, &st); |
957c4704 | 573 | if (ret < 0) |
79ff643d | 574 | return log_trace_errno(-errno, errno, "Failed to retrieve file status"); |
0c547523 | 575 | |
79ff643d CB |
576 | if (!S_ISDIR(st.st_mode)) |
577 | return log_trace_errno(0, ENOTDIR, "Not pinning because file descriptor is not a directory"); | |
0c547523 | 578 | |
79ff643d CB |
579 | fd_pin = open_at(dfd_path, ".lxc_keep", |
580 | PROTECT_OPEN | O_CREAT, | |
581 | PROTECT_LOOKUP_BENEATH, | |
582 | S_IWUSR | S_IRUSR); | |
e859a5ee WM |
583 | if (fd_pin < 0) { |
584 | if (errno == EROFS) { | |
585 | return log_trace_errno(0, EROFS, "Not pinning on read-only filesystem"); | |
586 | } | |
e26cf563 | 587 | return syserror("Failed to pin rootfs"); |
e859a5ee | 588 | } |
0c547523 | 589 | |
79ff643d | 590 | TRACE("Pinned rootfs %d(.lxc_keep)", fd_pin); |
0fd73091 | 591 | |
79ff643d CB |
592 | ret = fstatfs(fd_pin, &stfs); |
593 | if (ret < 0) { | |
594 | SYSWARN("Failed to retrieve filesystem status"); | |
595 | goto out; | |
596 | } | |
63fc76c3 | 597 | |
79ff643d CB |
598 | if (stfs.f_type == NFS_SUPER_MAGIC) { |
599 | DEBUG("Not unlinking pinned file on NFS"); | |
600 | goto out; | |
601 | } | |
63fc76c3 | 602 | |
79ff643d CB |
603 | if (unlinkat(dfd_path, ".lxc_keep", 0)) |
604 | SYSTRACE("Failed to unlink rootfs pinning file %d(.lxc_keep)", dfd_path); | |
605 | else | |
606 | TRACE("Unlinked pinned file %d(.lxc_keep)", dfd_path); | |
0fd73091 | 607 | |
79ff643d CB |
608 | out: |
609 | rootfs->fd_path_pin = move_fd(fd_pin); | |
610 | return 0; | |
0c547523 SH |
611 | } |
612 | ||
4b875ef9 CB |
613 | int lxc_rootfs_prepare_parent(struct lxc_handler *handler) |
614 | { | |
615 | __do_close int dfd_idmapped = -EBADF, fd_userns = -EBADF; | |
616 | struct lxc_rootfs *rootfs = &handler->conf->rootfs; | |
617 | struct lxc_storage *storage = rootfs->storage; | |
704cadd5 | 618 | const struct lxc_mount_options *mnt_opts = &rootfs->mnt_opts; |
4b875ef9 CB |
619 | int ret; |
620 | const char *path_source; | |
621 | ||
0589d744 | 622 | if (list_empty(&handler->conf->id_map)) |
4b875ef9 CB |
623 | return 0; |
624 | ||
625 | if (is_empty_string(rootfs->mnt_opts.userns_path)) | |
626 | return 0; | |
627 | ||
628 | if (handler->conf->rootfs_setup) | |
629 | return 0; | |
630 | ||
631 | if (rootfs_is_blockdev(handler->conf)) | |
632 | return syserror_set(-EOPNOTSUPP, "Idmapped mounts on block-backed storage not yet supported"); | |
633 | ||
634 | if (!can_use_bind_mounts()) | |
635 | return syserror_set(-EOPNOTSUPP, "Kernel does not support the new mount api"); | |
636 | ||
1b82d721 | 637 | if (strequal(rootfs->mnt_opts.userns_path, "container")) |
4b875ef9 CB |
638 | fd_userns = dup_cloexec(handler->nsfd[LXC_NS_USER]); |
639 | else | |
640 | fd_userns = open_at(-EBADF, rootfs->mnt_opts.userns_path, | |
641 | PROTECT_OPEN_WITH_TRAILING_SYMLINKS, 0, 0); | |
642 | if (fd_userns < 0) | |
643 | return syserror("Failed to open user namespace"); | |
644 | ||
645 | path_source = lxc_storage_get_path(storage->src, storage->type); | |
646 | ||
704cadd5 CB |
647 | dfd_idmapped = create_detached_idmapped_mount(path_source, fd_userns, true, |
648 | mnt_opts->attr.attr_set, | |
649 | mnt_opts->attr.attr_clr); | |
4b875ef9 CB |
650 | if (dfd_idmapped < 0) |
651 | return syserror("Failed to create detached idmapped mount"); | |
652 | ||
653 | ret = lxc_abstract_unix_send_fds(handler->data_sock[0], &dfd_idmapped, 1, NULL, 0); | |
654 | if (ret < 0) | |
655 | return syserror("Failed to send detached idmapped mount fd"); | |
656 | ||
657 | TRACE("Created detached idmapped mount %d", dfd_idmapped); | |
658 | return 0; | |
659 | } | |
660 | ||
6b741397 CB |
661 | static int add_shmount_to_list(struct lxc_conf *conf) |
662 | { | |
6b5a54cd | 663 | char new_mount[PATH_MAX]; |
0d190408 | 664 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
665 | * is absolute inside the container. |
666 | */ | |
667 | int offset = 1, ret = -1; | |
0d190408 | 668 | |
9bcde680 | 669 | ret = strnprintf(new_mount, sizeof(new_mount), |
6b741397 CB |
670 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, |
671 | conf->shmount.path_cont + offset); | |
9bcde680 | 672 | if (ret < 0) |
0d190408 LT |
673 | return -1; |
674 | ||
6b741397 | 675 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
676 | } |
677 | ||
6d25a524 | 678 | static int lxc_mount_auto_mounts(struct lxc_handler *handler, int flags) |
368bbc02 | 679 | { |
7b371c1e | 680 | int i, ret; |
b06b8511 CS |
681 | static struct { |
682 | int match_mask; | |
683 | int match_flag; | |
684 | const char *source; | |
685 | const char *destination; | |
686 | const char *fstype; | |
687 | unsigned long flags; | |
688 | const char *options; | |
e8b9c9ec | 689 | bool requires_cap_net_admin; |
b06b8511 | 690 | } default_mounts[] = { |
0fd73091 CB |
691 | /* Read-only bind-mounting... In older kernels, doing that |
692 | * required to do one MS_BIND mount and then | |
693 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
694 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
695 | * onwards. However, this apparently does not work on kernel | |
696 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
697 | * trick as above doesn't seem to work either, there one needs | |
698 | * to ALSO specify MS_BIND for the remount, otherwise the | |
699 | * entire fs is remounted read-only or the mount fails because | |
700 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
701 | * kernels as low as 2.6.32... | |
368bbc02 | 702 | */ |
5d1bf4c4 | 703 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL, false }, |
592fd47a | 704 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
cb4889ab | 705 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL, true, }, |
5d1bf4c4 CB |
706 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL, false }, |
707 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL, false }, | |
708 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL, true }, | |
709 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL, false }, | |
710 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL, false }, | |
711 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL, false }, | |
712 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL, false }, | |
713 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL, false }, | |
cb4889ab CB |
714 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL, false }, |
715 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL, false }, | |
716 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL, false }, | |
5d1bf4c4 | 717 | { 0, 0, NULL, NULL, NULL, 0, NULL, false } |
b06b8511 | 718 | }; |
6d25a524 | 719 | struct lxc_conf *conf = handler->conf; |
e25af1bc CB |
720 | struct lxc_rootfs *rootfs = &conf->rootfs; |
721 | bool has_cap_net_admin; | |
368bbc02 | 722 | |
f4bea7cc | 723 | if (flags & LXC_AUTO_PROC_MASK) { |
f6c5aab0 CB |
724 | if (rootfs->path) { |
725 | /* | |
726 | * Only unmount procfs if we have a separate rootfs so | |
727 | * we can still access it in safe_mount() below. | |
728 | */ | |
729 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/proc", | |
730 | rootfs->path ? rootfs->mount : ""); | |
731 | if (ret < 0) | |
732 | return ret_errno(EIO); | |
95258e34 | 733 | |
f6c5aab0 CB |
734 | ret = umount2(rootfs->buf, MNT_DETACH); |
735 | if (ret) | |
736 | SYSDEBUG("Tried to ensure procfs is unmounted"); | |
737 | } | |
95258e34 | 738 | |
ea57e424 | 739 | ret = mkdirat(rootfs->dfd_mnt, "proc" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
f4bea7cc | 740 | if (ret < 0 && errno != EEXIST) |
0d33a382 | 741 | return syserror("Failed to create procfs mountpoint under %d", rootfs->dfd_mnt); |
c119f018 CB |
742 | |
743 | TRACE("Created procfs mountpoint under %d", rootfs->dfd_mnt); | |
f4bea7cc CB |
744 | } |
745 | ||
746 | if (flags & LXC_AUTO_SYS_MASK) { | |
f6c5aab0 CB |
747 | if (rootfs->path) { |
748 | /* | |
749 | * Only unmount sysfs if we have a separate rootfs so | |
750 | * we can still access it in safe_mount() below. | |
751 | */ | |
752 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/sys", | |
753 | rootfs->path ? rootfs->mount : ""); | |
754 | if (ret < 0) | |
755 | return ret_errno(EIO); | |
95258e34 | 756 | |
f6c5aab0 CB |
757 | ret = umount2(rootfs->buf, MNT_DETACH); |
758 | if (ret) | |
759 | SYSDEBUG("Tried to ensure sysfs is unmounted"); | |
760 | } | |
95258e34 | 761 | |
ea57e424 | 762 | ret = mkdirat(rootfs->dfd_mnt, "sys" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
f4bea7cc | 763 | if (ret < 0 && errno != EEXIST) |
0d33a382 | 764 | return syserror("Failed to create sysfs mountpoint under %d", rootfs->dfd_mnt); |
c119f018 CB |
765 | |
766 | TRACE("Created sysfs mountpoint under %d", rootfs->dfd_mnt); | |
f4bea7cc CB |
767 | } |
768 | ||
e25af1bc | 769 | has_cap_net_admin = lxc_wants_cap(CAP_NET_ADMIN, conf); |
d84b26bc | 770 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 771 | __do_free char *destination = NULL, *source = NULL; |
cb4889ab | 772 | unsigned long mflags = default_mounts[i].flags; |
96f306e6 | 773 | |
0fd73091 CB |
774 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
775 | continue; | |
776 | ||
777 | if (default_mounts[i].source) { | |
cc4fd506 | 778 | /* will act like strdup if %r is not present */ |
e25af1bc | 779 | source = lxc_string_replace("%r", rootfs->path ? rootfs->mount : "", default_mounts[i].source); |
0fd73091 | 780 | if (!source) |
75fca1ac | 781 | return syserror_set(-ENOMEM, "Failed to create source path"); |
0fd73091 | 782 | } |
f24a52d5 | 783 | |
55022530 | 784 | if (!default_mounts[i].destination) |
75fca1ac | 785 | return syserror_set(-EINVAL, "BUG: auto mounts destination %d was NULL", i); |
0fd73091 | 786 | |
e8b9c9ec | 787 | if (!has_cap_net_admin && default_mounts[i].requires_cap_net_admin) { |
788 | TRACE("Container does not have CAP_NET_ADMIN. Skipping \"%s\" mount", default_mounts[i].source ?: "(null)"); | |
789 | continue; | |
790 | } | |
791 | ||
0fd73091 | 792 | /* will act like strdup if %r is not present */ |
e25af1bc | 793 | destination = lxc_string_replace("%r", rootfs->path ? rootfs->mount : "", default_mounts[i].destination); |
55022530 | 794 | if (!destination) |
75fca1ac | 795 | return syserror_set(-ENOMEM, "Failed to create target path"); |
0fd73091 | 796 | |
cb4889ab CB |
797 | ret = safe_mount(source, destination, |
798 | default_mounts[i].fstype, | |
799 | mflags, | |
800 | default_mounts[i].options, | |
75fca1ac | 801 | rootfs->path ? rootfs->mount : NULL); |
7b371c1e | 802 | if (ret < 0) { |
75fca1ac CB |
803 | if (errno != ENOENT) |
804 | return syserror("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
805 | ||
806 | INFO("Mount source or target for \"%s\" on \"%s\" does not exist. Skipping", source, destination); | |
807 | continue; | |
368bbc02 | 808 | } |
cb4889ab CB |
809 | |
810 | if (mflags & MS_REMOUNT) | |
811 | TRACE("Remounted automount \"%s\" on \"%s\" %s with flags %lu", source, destination, (mflags & MS_RDONLY) ? "read-only" : "read-write", mflags); | |
812 | else | |
813 | TRACE("Mounted automount \"%s\" on \"%s\" %s with flags %lu", source, destination, (mflags & MS_RDONLY) ? "read-only" : "read-write", mflags); | |
368bbc02 CS |
814 | } |
815 | ||
b06b8511 | 816 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
817 | int cg_flags; |
818 | ||
3f69fb12 | 819 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
820 | /* If the type of cgroup mount was not specified, it depends on |
821 | * the container's capabilities as to what makes sense: if we | |
822 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
823 | * read-write anyway, so we may as well default to read-write; | |
824 | * then the admin will not be given a false sense of security. | |
825 | * (And if they really want mixed r/o r/w, then they can | |
826 | * explicitly specify :mixed.) OTOH, if the container lacks | |
827 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
828 | * container can't remount it read-write. | |
829 | */ | |
9394b6dc | 830 | if ((cg_flags == LXC_AUTO_CGROUP_NOSPEC) || (cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC)) { |
0769b82a | 831 | int has_sys_admin = 0; |
b0ee5983 CB |
832 | |
833 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 834 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 835 | else |
0769b82a | 836 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
837 | |
838 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 839 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 840 | else |
0769b82a | 841 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 842 | } |
0fd73091 | 843 | |
3f69fb12 | 844 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
845 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
846 | ||
ab8cd5d9 | 847 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, handler, cg_flags)) |
55022530 | 848 | return log_error_errno(-1, errno, "Failed to mount \"/sys/fs/cgroup\""); |
368bbc02 CS |
849 | } |
850 | ||
0d190408 | 851 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
7b371c1e | 852 | ret = add_shmount_to_list(conf); |
55022530 CB |
853 | if (ret < 0) |
854 | return log_error(-1, "Failed to add shmount entry to container config"); | |
0d190408 LT |
855 | } |
856 | ||
368bbc02 | 857 | return 0; |
368bbc02 CS |
858 | } |
859 | ||
4e5440c6 | 860 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 861 | { |
0fd73091 CB |
862 | int ret; |
863 | ||
4e5440c6 DL |
864 | if (!utsname) |
865 | return 0; | |
0ad19a3f | 866 | |
0fd73091 | 867 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
55022530 CB |
868 | if (ret < 0) |
869 | return log_error_errno(-1, errno, "Failed to set the hostname to \"%s\"", | |
870 | utsname->nodename); | |
0ad19a3f | 871 | |
0fd73091 | 872 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 873 | |
0ad19a3f | 874 | return 0; |
875 | } | |
876 | ||
69aa6655 DE |
877 | struct dev_symlinks { |
878 | const char *oldpath; | |
879 | const char *name; | |
880 | }; | |
881 | ||
882 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
883 | { "/proc/self/fd", "fd" }, |
884 | { "/proc/self/fd/0", "stdin" }, | |
885 | { "/proc/self/fd/1", "stdout" }, | |
886 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
887 | }; |
888 | ||
ed8704d0 | 889 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 890 | { |
79019997 CB |
891 | for (int i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
892 | int ret; | |
893 | struct stat s; | |
69aa6655 | 894 | const struct dev_symlinks *d = &dev_symlinks[i]; |
0fd73091 | 895 | |
79019997 CB |
896 | /* |
897 | * Stat the path first. If we don't get an error accept it as | |
0fd73091 | 898 | * is and don't try to create it |
09227be2 | 899 | */ |
a5a08920 | 900 | ret = fstatat(rootfs->dfd_dev, d->name, &s, 0); |
0fd73091 | 901 | if (ret == 0) |
09227be2 | 902 | continue; |
09227be2 | 903 | |
a5a08920 | 904 | ret = symlinkat(d->oldpath, rootfs->dfd_dev, d->name); |
79019997 CB |
905 | if (ret) { |
906 | switch (errno) { | |
907 | case EROFS: | |
908 | WARN("Failed to create \"%s\" on read-only filesystem", d->name); | |
909 | __fallthrough; | |
910 | case EEXIST: | |
911 | break; | |
912 | default: | |
913 | return log_error_errno(-errno, errno, "Failed to create \"%s\"", d->name); | |
914 | } | |
69aa6655 DE |
915 | } |
916 | } | |
0fd73091 | 917 | |
69aa6655 DE |
918 | return 0; |
919 | } | |
920 | ||
2187efd3 | 921 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 922 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 923 | { |
393903d1 | 924 | char *p; |
f1e05b90 | 925 | size_t size; |
393903d1 SH |
926 | |
927 | if (!*pp) { | |
b8e43ef0 | 928 | *pp = zalloc(strlen(name) + strlen("container_ttys=") + 1); |
393903d1 SH |
929 | if (!*pp) |
930 | return false; | |
0fd73091 | 931 | |
393903d1 SH |
932 | sprintf(*pp, "container_ttys=%s", name); |
933 | return true; | |
934 | } | |
0fd73091 | 935 | |
f1e05b90 DJ |
936 | size = strlen(*pp) + strlen(name) + 2; |
937 | p = realloc(*pp, size); | |
393903d1 SH |
938 | if (!p) |
939 | return false; | |
0fd73091 | 940 | |
393903d1 | 941 | *pp = p; |
f1e05b90 DJ |
942 | (void)strlcat(p, " ", size); |
943 | (void)strlcat(p, name, size); | |
0fd73091 | 944 | |
393903d1 SH |
945 | return true; |
946 | } | |
947 | ||
128655e7 PM |
948 | static int open_ttymnt_at(int dfd, const char *path) |
949 | { | |
950 | int fd; | |
951 | ||
777827cb CB |
952 | fd = open_at(dfd, path, |
953 | PROTECT_OPEN | O_CREAT | O_EXCL, | |
954 | PROTECT_LOOKUP_BENEATH, | |
955 | 0); | |
956 | if (fd < 0) { | |
957 | if (!IN_SET(errno, ENXIO, EEXIST)) | |
958 | return syserror("Failed to create \"%d/\%s\"", dfd, path); | |
959 | ||
960 | SYSINFO("Failed to create \"%d/\%s\"", dfd, path); | |
961 | fd = open_at(dfd, path, | |
962 | PROTECT_OPATH_FILE, | |
963 | PROTECT_LOOKUP_BENEATH, | |
964 | 0); | |
965 | } | |
128655e7 PM |
966 | |
967 | return fd; | |
968 | } | |
969 | ||
2187efd3 | 970 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 971 | { |
7369e6bf CB |
972 | int ret; |
973 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
0e4be3cf | 974 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 975 | char *ttydir = ttys->dir; |
b0a33c1e | 976 | |
e8bd4e43 | 977 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
978 | return 0; |
979 | ||
7369e6bf CB |
980 | for (int i = 0; i < ttys->max; i++) { |
981 | __do_close int fd_to = -EBADF; | |
0e4be3cf | 982 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 983 | |
7c6ef2a2 | 984 | if (ttydir) { |
7369e6bf | 985 | char *tty_name, *tty_path; |
9e1045e3 | 986 | |
9bcde680 | 987 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), |
7369e6bf | 988 | "/dev/%s/tty%d", ttydir, i + 1); |
9bcde680 | 989 | if (ret < 0) |
7369e6bf CB |
990 | return ret_errno(-EIO); |
991 | ||
992 | tty_path = &rootfs->buf[STRLITERALLEN("/dev/")]; | |
993 | tty_name = tty_path + strlen(ttydir) + 1; | |
994 | ||
995 | /* create bind-mount target */ | |
128655e7 | 996 | fd_to = open_ttymnt_at(rootfs->dfd_dev, tty_path); |
7369e6bf CB |
997 | if (fd_to < 0) |
998 | return log_error_errno(-errno, errno, | |
999 | "Failed to create tty mount target %d(%s)", | |
1000 | rootfs->dfd_dev, tty_path); | |
1001 | ||
1002 | ret = unlinkat(rootfs->dfd_dev, tty_name, 0); | |
1003 | if (ret < 0 && errno != ENOENT) | |
1004 | return log_error_errno(-errno, errno, | |
1005 | "Failed to unlink %d(%s)", | |
1006 | rootfs->dfd_dev, tty_name); | |
1007 | ||
84f8f9e4 | 1008 | if (can_use_mount_api()) |
7369e6bf CB |
1009 | ret = fd_bind_mount(tty->pty, "", |
1010 | PROTECT_OPATH_FILE, | |
1011 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1012 | fd_to, "", | |
1013 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1014 | PROTECT_LOOKUP_BENEATH_XDEV, |
1015 | 0, | |
1016 | 0, | |
1017 | 0, | |
7369e6bf | 1018 | false); |
84f8f9e4 CB |
1019 | else |
1020 | ret = mount_fd(tty->pty, fd_to, "none", MS_BIND, 0); | |
7369e6bf CB |
1021 | if (ret < 0) |
1022 | return log_error_errno(-errno, errno, | |
1023 | "Failed to bind mount \"%s\" onto \"%s\"", | |
1024 | tty->name, rootfs->buf); | |
1025 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, rootfs->buf); | |
9e1045e3 | 1026 | |
7369e6bf | 1027 | ret = symlinkat(tty_path, rootfs->dfd_dev, tty_name); |
55022530 | 1028 | if (ret < 0) |
7369e6bf CB |
1029 | return log_error_errno(-errno, errno, |
1030 | "Failed to create symlink \"%d(%s)\" -> \"%d(%s)\"", | |
1031 | rootfs->dfd_dev, tty_name, | |
1032 | rootfs->dfd_dev, tty_path); | |
7c6ef2a2 | 1033 | } else { |
9bcde680 CB |
1034 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "tty%d", i + 1); |
1035 | if (ret < 0) | |
7369e6bf CB |
1036 | return ret_errno(-EIO); |
1037 | ||
1038 | /* If we populated /dev, then we need to create /dev/tty<idx>. */ | |
128655e7 | 1039 | fd_to = open_ttymnt_at(rootfs->dfd_dev, rootfs->buf); |
7369e6bf CB |
1040 | if (fd_to < 0) |
1041 | return log_error_errno(-errno, errno, | |
1042 | "Failed to create tty mount target %d(%s)", | |
1043 | rootfs->dfd_dev, rootfs->buf); | |
1044 | ||
84f8f9e4 | 1045 | if (can_use_mount_api()) |
7369e6bf CB |
1046 | ret = fd_bind_mount(tty->pty, "", |
1047 | PROTECT_OPATH_FILE, | |
1048 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1049 | fd_to, "", | |
1050 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1051 | PROTECT_LOOKUP_BENEATH, |
1052 | 0, | |
1053 | 0, | |
1054 | 0, | |
7369e6bf | 1055 | false); |
84f8f9e4 CB |
1056 | else |
1057 | ret = mount_fd(tty->pty, fd_to, "none", MS_BIND, 0); | |
7369e6bf CB |
1058 | if (ret < 0) |
1059 | return log_error_errno(-errno, errno, | |
1060 | "Failed to bind mount \"%s\" onto \"%s\"", | |
1061 | tty->name, rootfs->buf); | |
1062 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, rootfs->buf); | |
393903d1 | 1063 | } |
9e1045e3 | 1064 | |
55022530 CB |
1065 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) |
1066 | return log_error(-1, "Error setting up container_ttys string"); | |
b0a33c1e | 1067 | } |
1068 | ||
885766f5 | 1069 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 1070 | return 0; |
1071 | } | |
1072 | ||
9d0e129b CB |
1073 | define_cleanup_function(struct lxc_tty_info *, lxc_delete_tty); |
1074 | ||
59eac805 | 1075 | static int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 1076 | { |
9d0e129b | 1077 | call_cleaner(lxc_delete_tty) struct lxc_tty_info *ttys = &conf->ttys; |
fca23691 | 1078 | int ret; |
2187efd3 CB |
1079 | |
1080 | /* no tty in the configuration */ | |
885766f5 | 1081 | if (ttys->max == 0) |
2187efd3 CB |
1082 | return 0; |
1083 | ||
9d0e129b CB |
1084 | ttys->tty = zalloc(sizeof(struct lxc_terminal_info) * ttys->max); |
1085 | if (!ttys->tty) | |
2187efd3 | 1086 | return -ENOMEM; |
2187efd3 | 1087 | |
7369e6bf | 1088 | for (size_t i = 0; i < conf->ttys.max; i++) { |
d926c261 | 1089 | int pty_nr = -1; |
9d0e129b | 1090 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1091 | |
4dcf0c43 | 1092 | ret = lxc_devpts_terminal(conf->devpts_fd, &tty->ptx, |
18129d94 | 1093 | &tty->pty, &pty_nr, false); |
77a39805 | 1094 | if (ret < 0) { |
7369e6bf | 1095 | conf->ttys.max = i; |
6a2ca1b4 | 1096 | return syserror_set(-ENOTTY, "Failed to create tty %zu", i); |
2187efd3 | 1097 | } |
d926c261 CB |
1098 | DEBUG("Created tty with ptx fd %d and pty fd %d and index %d", |
1099 | tty->ptx, tty->pty, pty_nr); | |
7581d645 | 1100 | tty->busy = -1; |
2187efd3 CB |
1101 | } |
1102 | ||
885766f5 | 1103 | INFO("Finished creating %zu tty devices", ttys->max); |
9d0e129b | 1104 | move_ptr(ttys); |
2187efd3 CB |
1105 | return 0; |
1106 | } | |
1107 | ||
0e4be3cf | 1108 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 | 1109 | { |
b35f8f7e | 1110 | if (!ttys || !ttys->tty) |
386e6768 CB |
1111 | return; |
1112 | ||
55022530 | 1113 | for (int i = 0; i < ttys->max; i++) { |
0e4be3cf | 1114 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
36a94ce8 | 1115 | close_prot_errno_disarm(tty->ptx); |
41808e20 | 1116 | close_prot_errno_disarm(tty->pty); |
2187efd3 CB |
1117 | } |
1118 | ||
55022530 | 1119 | free_disarm(ttys->tty); |
2187efd3 CB |
1120 | } |
1121 | ||
1b82d721 | 1122 | static int __lxc_send_ttys_to_parent(struct lxc_handler *handler) |
2187efd3 CB |
1123 | { |
1124 | int i; | |
0fd73091 | 1125 | int ret = -1; |
2187efd3 | 1126 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1127 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1128 | int sock = handler->data_sock[0]; |
2187efd3 | 1129 | |
885766f5 | 1130 | if (ttys->max == 0) |
2187efd3 CB |
1131 | return 0; |
1132 | ||
885766f5 | 1133 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1134 | int ttyfds[2]; |
0e4be3cf | 1135 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1136 | |
36a94ce8 | 1137 | ttyfds[0] = tty->ptx; |
41808e20 | 1138 | ttyfds[1] = tty->pty; |
2187efd3 CB |
1139 | |
1140 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1141 | if (ret < 0) | |
1142 | break; | |
1143 | ||
41808e20 CB |
1144 | TRACE("Sent tty \"%s\" with ptx fd %d and pty fd %d to parent", |
1145 | tty->name, tty->ptx, tty->pty); | |
2187efd3 CB |
1146 | } |
1147 | ||
1148 | if (ret < 0) | |
6d1400b5 | 1149 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1150 | else |
885766f5 | 1151 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1152 | |
1153 | return ret; | |
1154 | } | |
1155 | ||
1156 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1157 | { | |
1158 | int ret = -1; | |
1159 | struct lxc_conf *conf = handler->conf; | |
1160 | ||
663014ee | 1161 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1162 | if (ret < 0) { |
1163 | ERROR("Failed to allocate ttys"); | |
1164 | goto on_error; | |
1165 | } | |
1166 | ||
2187efd3 CB |
1167 | if (!conf->is_execute) { |
1168 | ret = lxc_setup_ttys(conf); | |
1169 | if (ret < 0) { | |
1170 | ERROR("Failed to setup ttys"); | |
1171 | goto on_error; | |
1172 | } | |
1173 | } | |
1174 | ||
885766f5 CB |
1175 | if (conf->ttys.tty_names) { |
1176 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
1b82d721 | 1177 | if (ret < 0) { |
885766f5 | 1178 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
1b82d721 CB |
1179 | goto on_error; |
1180 | } | |
2187efd3 CB |
1181 | } |
1182 | ||
1b82d721 | 1183 | return 0; |
2187efd3 CB |
1184 | |
1185 | on_error: | |
0e4be3cf | 1186 | lxc_delete_tty(&conf->ttys); |
2187efd3 | 1187 | |
1b82d721 CB |
1188 | return -1; |
1189 | } | |
1190 | ||
111ed96e | 1191 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) |
1b82d721 CB |
1192 | { |
1193 | int ret = -1; | |
1194 | ||
1195 | ret = __lxc_send_ttys_to_parent(handler); | |
1196 | lxc_delete_tty(&handler->conf->ttys); | |
2187efd3 CB |
1197 | return ret; |
1198 | } | |
1199 | ||
7133b912 CB |
1200 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1201 | * error, log it but don't fail yet. | |
91c3830e | 1202 | */ |
7133b912 | 1203 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
63012bdd | 1204 | int autodevtmpfssize, const char *lxcpath) |
91c3830e | 1205 | { |
bfbfeedf | 1206 | __do_close int fd_fs = -EBADF; |
ee8eeba8 | 1207 | const char *path = rootfs->path ? rootfs->mount : NULL; |
bfbfeedf | 1208 | size_t tmpfs_size = (autodevtmpfssize != 0) ? autodevtmpfssize : 500000; |
91c3830e | 1209 | int ret; |
87e0e273 | 1210 | mode_t cur_mask; |
63012bdd | 1211 | char mount_options[128]; |
91c3830e | 1212 | |
7133b912 | 1213 | INFO("Preparing \"/dev\""); |
bc6928ff | 1214 | |
87e0e273 | 1215 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
ea57e424 | 1216 | ret = mkdirat(rootfs->dfd_mnt, "dev" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
87e0e273 CB |
1217 | if (ret < 0 && errno != EEXIST) { |
1218 | SYSERROR("Failed to create \"/dev\" directory"); | |
1219 | ret = -errno; | |
1220 | goto reset_umask; | |
bc6928ff | 1221 | } |
87da4ec3 | 1222 | |
de7f9f33 | 1223 | if (can_use_mount_api()) { |
635e7bac CB |
1224 | fd_fs = fs_prepare("tmpfs", -EBADF, "", 0, 0); |
1225 | if (fd_fs < 0) | |
1226 | return log_error_errno(-errno, errno, "Failed to prepare filesystem context for tmpfs"); | |
ee8eeba8 | 1227 | |
bfbfeedf CB |
1228 | sprintf(mount_options, "%zu", tmpfs_size); |
1229 | ||
1230 | ret = fs_set_property(fd_fs, "mode", "0755"); | |
1231 | if (ret < 0) | |
1232 | return log_error_errno(-errno, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs); | |
1233 | ||
1234 | ret = fs_set_property(fd_fs, "size", mount_options); | |
1235 | if (ret < 0) | |
1236 | return log_error_errno(-errno, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs); | |
1237 | ||
89606dfb CB |
1238 | ret = fs_attach(fd_fs, rootfs->dfd_mnt, "dev", |
1239 | PROTECT_OPATH_DIRECTORY, | |
1240 | PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
635e7bac CB |
1241 | } else { |
1242 | __do_free char *fallback_path = NULL; | |
1243 | ||
1244 | sprintf(mount_options, "size=%zu,mode=755", tmpfs_size); | |
1245 | DEBUG("Using mount options: %s", mount_options); | |
1246 | ||
1247 | if (path) { | |
1248 | fallback_path = must_make_path(path, "/dev", NULL); | |
1249 | ret = safe_mount("none", fallback_path, "tmpfs", 0, mount_options, path); | |
1250 | } else { | |
1251 | ret = safe_mount("none", "dev", "tmpfs", 0, mount_options, NULL); | |
1252 | } | |
87e0e273 | 1253 | } |
bfbfeedf CB |
1254 | if (ret < 0) { |
1255 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1256 | goto reset_umask; | |
1257 | } | |
1258 | ||
7133b912 | 1259 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1260 | * If not, then create it and exit if that fails... |
1261 | */ | |
ea57e424 | 1262 | ret = mkdirat(rootfs->dfd_mnt, "dev/pts", S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
87e0e273 | 1263 | if (ret < 0 && errno != EEXIST) { |
bfbfeedf | 1264 | SYSERROR("Failed to create directory \"dev/pts\""); |
87e0e273 CB |
1265 | ret = -errno; |
1266 | goto reset_umask; | |
91c3830e SH |
1267 | } |
1268 | ||
87e0e273 CB |
1269 | ret = 0; |
1270 | ||
1271 | reset_umask: | |
1272 | (void)umask(cur_mask); | |
1273 | ||
7133b912 | 1274 | INFO("Prepared \"/dev\""); |
87e0e273 | 1275 | return ret; |
91c3830e SH |
1276 | } |
1277 | ||
5e73416f | 1278 | struct lxc_device_node { |
74a3920a | 1279 | const char *name; |
5e73416f CB |
1280 | const mode_t mode; |
1281 | const int maj; | |
1282 | const int min; | |
c6883f38 SH |
1283 | }; |
1284 | ||
5e73416f | 1285 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1286 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1287 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1288 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1289 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1290 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1291 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1292 | }; |
1293 | ||
5067e4dd CB |
1294 | |
1295 | enum { | |
1296 | LXC_DEVNODE_BIND, | |
1297 | LXC_DEVNODE_MKNOD, | |
1298 | LXC_DEVNODE_PARTIAL, | |
1299 | LXC_DEVNODE_OPEN, | |
1300 | }; | |
1301 | ||
887ae844 | 1302 | static int lxc_fill_autodev(struct lxc_rootfs *rootfs) |
c6883f38 | 1303 | { |
5e73416f | 1304 | int i, ret; |
3a32201c | 1305 | mode_t cmask; |
5067e4dd | 1306 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1307 | |
a5a08920 | 1308 | if (rootfs->dfd_dev < 0) |
81498328 | 1309 | return log_info(0, "No /dev directory found, skipping setup"); |
d43d5191 | 1310 | |
3999be0a CB |
1311 | INFO("Populating \"/dev\""); |
1312 | ||
3a32201c | 1313 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1314 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
5e73416f | 1315 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1316 | |
5067e4dd | 1317 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
a5a08920 | 1318 | ret = mknodat(rootfs->dfd_dev, device->name, device->mode, makedev(device->maj, device->min)); |
5e73416f | 1319 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { |
d43d5191 | 1320 | DEBUG("Created device node \"%s\"", device->name); |
5067e4dd | 1321 | } else if (ret < 0) { |
55022530 | 1322 | if (errno != EPERM) |
d43d5191 | 1323 | return log_error_errno(-1, errno, "Failed to create device node \"%s\"", device->name); |
0bbf8572 | 1324 | |
5067e4dd | 1325 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1326 | } |
3999be0a | 1327 | |
5067e4dd CB |
1328 | /* Device nodes are fully useable. */ |
1329 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1330 | continue; | |
1331 | ||
1332 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
d43d5191 | 1333 | __do_close int fd = -EBADF; |
5067e4dd CB |
1334 | /* See |
1335 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1336 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1337 | */ | |
a5a08920 | 1338 | fd = open_at(rootfs->dfd_dev, device->name, PROTECT_OPEN, PROTECT_LOOKUP_BENEATH, 0); |
d43d5191 | 1339 | if (fd >= 0) { |
5067e4dd CB |
1340 | /* Device nodes are fully useable. */ |
1341 | use_mknod = LXC_DEVNODE_OPEN; | |
1342 | continue; | |
1343 | } | |
1344 | ||
d43d5191 | 1345 | SYSTRACE("Failed to open \"%s\" device", device->name); |
5067e4dd CB |
1346 | /* Device nodes are only partially useable. */ |
1347 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1348 | } | |
5e73416f CB |
1349 | } |
1350 | ||
5067e4dd CB |
1351 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1352 | /* If we are dealing with partially functional device | |
1353 | * nodes the prio mknod() call will have created the | |
1354 | * device node so we can use it as a bind-mount target. | |
1355 | */ | |
a5a08920 | 1356 | ret = mknodat(rootfs->dfd_dev, device->name, S_IFREG | 0000, 0); |
55022530 | 1357 | if (ret < 0 && errno != EEXIST) |
d43d5191 | 1358 | return log_error_errno(-1, errno, "Failed to create file \"%s\"", device->name); |
5e73416f CB |
1359 | } |
1360 | ||
1361 | /* Fallback to bind-mounting the device from the host. */ | |
9bcde680 CB |
1362 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "dev/%s", device->name); |
1363 | if (ret < 0) | |
b41ff502 | 1364 | return ret_errno(EIO); |
5e73416f | 1365 | |
de7f9f33 | 1366 | if (can_use_mount_api()) { |
887ae844 | 1367 | ret = fd_bind_mount(rootfs->dfd_host, rootfs->buf, |
635e7bac CB |
1368 | PROTECT_OPATH_FILE, |
1369 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1370 | rootfs->dfd_dev, device->name, | |
1371 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1372 | PROTECT_LOOKUP_BENEATH, |
1373 | 0, | |
1374 | 0, | |
1375 | 0, | |
1376 | false); | |
635e7bac | 1377 | } else { |
927ea337 CB |
1378 | char path[PATH_MAX]; |
1379 | ||
9bcde680 CB |
1380 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/dev/%s", device->name); |
1381 | if (ret < 0) | |
927ea337 CB |
1382 | return ret_errno(EIO); |
1383 | ||
9bcde680 CB |
1384 | ret = strnprintf(path, sizeof(path), "%s/dev/%s", get_rootfs_mnt(rootfs), device->name); |
1385 | if (ret < 0) | |
927ea337 CB |
1386 | return log_error(-1, "Failed to create device path for %s", device->name); |
1387 | ||
887ae844 | 1388 | ret = safe_mount(rootfs->buf, path, 0, MS_BIND, NULL, get_rootfs_mnt(rootfs)); |
927ea337 | 1389 | if (ret < 0) |
887ae844 | 1390 | return log_error_errno(-1, errno, "Failed to bind mount host device node \"%s\" to \"%s\"", rootfs->buf, path); |
927ea337 | 1391 | |
887ae844 | 1392 | DEBUG("Bind mounted host device node \"%s\" to \"%s\"", rootfs->buf, path); |
927ea337 | 1393 | continue; |
d43d5191 | 1394 | } |
887ae844 | 1395 | DEBUG("Bind mounted host device %d(%s) to %d(%s)", rootfs->dfd_host, rootfs->buf, rootfs->dfd_dev, device->name); |
c6883f38 | 1396 | } |
5e73416f | 1397 | (void)umask(cmask); |
c6883f38 | 1398 | |
3999be0a | 1399 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1400 | return 0; |
1401 | } | |
1402 | ||
4e86cad3 | 1403 | static int lxc_mount_rootfs(struct lxc_rootfs *rootfs) |
0ad19a3f | 1404 | { |
9aa76a17 | 1405 | int ret; |
cc28d0b0 | 1406 | |
a0f379bf | 1407 | if (!rootfs->path) { |
0fd73091 | 1408 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
55022530 | 1409 | if (ret < 0) |
9e61fb1f | 1410 | return log_error_errno(-1, errno, "Failed to recursively turn root mount tree into dependent mount"); |
0fd73091 | 1411 | |
ea57e424 CB |
1412 | rootfs->dfd_mnt = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
1413 | if (rootfs->dfd_mnt < 0) | |
31f8b2fd CB |
1414 | return -errno; |
1415 | ||
c119f018 | 1416 | return log_trace(0, "Container doesn't use separate rootfs. Opened host's rootfs"); |
a0f379bf | 1417 | } |
0ad19a3f | 1418 | |
0fd73091 | 1419 | ret = access(rootfs->mount, F_OK); |
55022530 CB |
1420 | if (ret != 0) |
1421 | return log_error_errno(-1, errno, "Failed to access to \"%s\". Check it is present", | |
1422 | rootfs->mount); | |
b1789442 | 1423 | |
4e86cad3 | 1424 | ret = rootfs->storage->ops->mount(rootfs->storage); |
55022530 CB |
1425 | if (ret < 0) |
1426 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
1427 | rootfs->path, rootfs->mount, | |
e73af35b | 1428 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
0ad19a3f | 1429 | |
0fd73091 | 1430 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 | 1431 | rootfs->path, rootfs->mount, |
e73af35b | 1432 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
9aa76a17 | 1433 | |
ea57e424 CB |
1434 | rootfs->dfd_mnt = open_at(-EBADF, rootfs->mount, PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); |
1435 | if (rootfs->dfd_mnt < 0) | |
31f8b2fd CB |
1436 | return -errno; |
1437 | ||
c119f018 | 1438 | return log_trace(0, "Container uses separate rootfs. Opened container's rootfs"); |
ac778708 DL |
1439 | } |
1440 | ||
59eac805 | 1441 | static int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1442 | { |
b8d88764 | 1443 | __do_free char *nroot = NULL; |
0fd73091 | 1444 | int i, ret; |
8ce1abc2 | 1445 | char *root = rootfs->mount; |
91e93c71 | 1446 | |
74e7b662 | 1447 | nroot = realpath(root, NULL); |
55022530 CB |
1448 | if (!nroot) |
1449 | return log_error_errno(-1, errno, "Failed to resolve \"%s\"", root); | |
91e93c71 | 1450 | |
0fd73091 | 1451 | ret = chdir("/"); |
b8d88764 | 1452 | if (ret < 0) |
0fd73091 | 1453 | return -1; |
91e93c71 | 1454 | |
0fd73091 CB |
1455 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1456 | * can't be moved. | |
91e93c71 | 1457 | */ |
8ce1abc2 | 1458 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
55022530 CB |
1459 | if (ret < 0) |
1460 | return log_error_errno(-1, errno, "Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); | |
91e93c71 | 1461 | |
0fd73091 | 1462 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
55022530 CB |
1463 | if (ret < 0) |
1464 | return log_error_errno(-1, errno, "Failed to remount \"/\""); | |
91e93c71 | 1465 | |
aa899945 | 1466 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1467 | * for CT. |
91e93c71 AV |
1468 | * |
1469 | * The mountinfo file shows not all mounts, if a few points have been | |
1470 | * unmounted between read operations from the mountinfo. So we need to | |
1471 | * read mountinfo a few times. | |
1472 | * | |
7ded5fa7 | 1473 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1474 | * inherited mounts are locked and we should live with all this trash. |
1475 | */ | |
0fd73091 | 1476 | for (;;) { |
4fdd1f72 | 1477 | __do_fclose FILE *f = NULL; |
f3d38164 CB |
1478 | __do_free char *line = NULL; |
1479 | char *slider1, *slider2; | |
91e93c71 | 1480 | int progress = 0; |
f3d38164 | 1481 | size_t len = 0; |
91e93c71 | 1482 | |
4110345b | 1483 | f = fopen("./proc/self/mountinfo", "re"); |
55022530 CB |
1484 | if (!f) |
1485 | return log_error_errno(-1, errno, "Failed to open \"/proc/self/mountinfo\""); | |
0fd73091 | 1486 | |
f3d38164 CB |
1487 | while (getline(&line, &len, f) > 0) { |
1488 | for (slider1 = line, i = 0; slider1 && i < 4; i++) | |
1489 | slider1 = strchr(slider1 + 1, ' '); | |
0fd73091 | 1490 | |
f3d38164 | 1491 | if (!slider1) |
91e93c71 | 1492 | continue; |
0fd73091 | 1493 | |
f3d38164 CB |
1494 | slider2 = strchr(slider1 + 1, ' '); |
1495 | if (!slider2) | |
91e93c71 AV |
1496 | continue; |
1497 | ||
f3d38164 CB |
1498 | *slider2 = '\0'; |
1499 | *slider1 = '.'; | |
91e93c71 | 1500 | |
71528742 | 1501 | if (strequal(slider1 + 1, "/")) |
91e93c71 | 1502 | continue; |
0fd73091 | 1503 | |
71528742 | 1504 | if (strequal(slider1 + 1, "/proc")) |
91e93c71 AV |
1505 | continue; |
1506 | ||
f3d38164 | 1507 | ret = umount2(slider1, MNT_DETACH); |
0fd73091 | 1508 | if (ret == 0) |
91e93c71 AV |
1509 | progress++; |
1510 | } | |
0fd73091 | 1511 | |
91e93c71 AV |
1512 | if (!progress) |
1513 | break; | |
1514 | } | |
1515 | ||
7ded5fa7 | 1516 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1517 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1518 | |
1519 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 | 1520 | ret = chdir(".."); |
55022530 CB |
1521 | if (ret < 0) |
1522 | return log_error_errno(-1, errno, "Failed to chdir(\"..\")"); | |
91e93c71 | 1523 | |
0fd73091 | 1524 | ret = chroot("."); |
55022530 CB |
1525 | if (ret < 0) |
1526 | return log_error_errno(-1, errno, "Failed to chroot(\".\")"); | |
91e93c71 AV |
1527 | |
1528 | return 0; | |
1529 | } | |
1530 | ||
8ce1abc2 CB |
1531 | /* (The following explanation is copied verbatim from the kernel.) |
1532 | * | |
1533 | * pivot_root Semantics: | |
1534 | * Moves the root file system of the current process to the directory put_old, | |
1535 | * makes new_root as the new root file system of the current process, and sets | |
1536 | * root/cwd of all processes which had them on the current root to new_root. | |
1537 | * | |
1538 | * Restrictions: | |
1539 | * The new_root and put_old must be directories, and must not be on the | |
1540 | * same file system as the current process root. The put_old must be | |
1541 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1542 | * pointed to by put_old must yield the same directory as new_root. No other | |
1543 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1544 | * | |
1545 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1546 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1547 | * in this situation. | |
1548 | * | |
1549 | * Notes: | |
1550 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1551 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1552 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1553 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1554 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1555 | * first. | |
1556 | */ | |
7f50ec8b | 1557 | static int lxc_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1558 | { |
7f50ec8b | 1559 | __do_close int fd_oldroot = -EBADF; |
b0d7aac4 | 1560 | int ret; |
0fd73091 | 1561 | |
7f50ec8b CB |
1562 | fd_oldroot = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
1563 | if (fd_oldroot < 0) | |
55022530 | 1564 | return log_error_errno(-1, errno, "Failed to open old root directory"); |
ac778708 | 1565 | |
8ce1abc2 | 1566 | /* change into new root fs */ |
ea57e424 | 1567 | ret = fchdir(rootfs->dfd_mnt); |
55022530 | 1568 | if (ret < 0) |
7f50ec8b | 1569 | return log_error_errno(-errno, errno, "Failed to change into new root directory \"%s\"", rootfs->mount); |
39c7b795 | 1570 | |
8ce1abc2 CB |
1571 | /* pivot_root into our new root fs */ |
1572 | ret = pivot_root(".", "."); | |
55022530 | 1573 | if (ret < 0) |
7f50ec8b | 1574 | return log_error_errno(-errno, errno, "Failed to pivot into new root directory \"%s\"", rootfs->mount); |
39c7b795 | 1575 | |
8ce1abc2 CB |
1576 | /* At this point the old-root is mounted on top of our new-root. To |
1577 | * unmounted it we must not be chdir'd into it, so escape back to | |
1578 | * old-root. | |
1579 | */ | |
7f50ec8b | 1580 | ret = fchdir(fd_oldroot); |
55022530 | 1581 | if (ret < 0) |
7f50ec8b | 1582 | return log_error_errno(-errno, errno, "Failed to enter old root directory"); |
c69bd12f | 1583 | |
7f50ec8b CB |
1584 | /* |
1585 | * Make fd_oldroot a depedent mount to make sure our umounts don't | |
1586 | * propagate to the host. | |
8ce1abc2 CB |
1587 | */ |
1588 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
55022530 | 1589 | if (ret < 0) |
7f50ec8b | 1590 | return log_error_errno(-errno, errno, "Failed to recursively turn old root mount tree into dependent mount"); |
8ce1abc2 CB |
1591 | |
1592 | ret = umount2(".", MNT_DETACH); | |
55022530 | 1593 | if (ret < 0) |
7f50ec8b | 1594 | return log_error_errno(-errno, errno, "Failed to detach old root directory"); |
8ce1abc2 | 1595 | |
ea57e424 | 1596 | ret = fchdir(rootfs->dfd_mnt); |
55022530 | 1597 | if (ret < 0) |
7f50ec8b | 1598 | return log_error_errno(-errno, errno, "Failed to re-enter new root directory \"%s\"", rootfs->mount); |
8ce1abc2 | 1599 | |
7f50ec8b | 1600 | TRACE("Changed into new rootfs \"%s\"", rootfs->mount); |
b0d7aac4 | 1601 | return 0; |
0ad19a3f | 1602 | } |
1603 | ||
8ce1abc2 CB |
1604 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1605 | { | |
55022530 CB |
1606 | if (!rootfs->path) |
1607 | return log_debug(0, "Container does not have a rootfs"); | |
8ce1abc2 CB |
1608 | |
1609 | if (detect_ramfs_rootfs()) | |
1610 | return lxc_chroot(rootfs); | |
1611 | ||
7f50ec8b | 1612 | return lxc_pivot_root(rootfs); |
0ad19a3f | 1613 | } |
1614 | ||
7581a82f | 1615 | static const struct id_map *find_mapped_nsid_entry(const struct lxc_conf *conf, |
8ce1abc2 CB |
1616 | unsigned id, |
1617 | enum idtype idtype) | |
f4900711 | 1618 | { |
f4900711 CB |
1619 | struct id_map *map; |
1620 | struct id_map *retmap = NULL; | |
1621 | ||
dcf0ffdf CB |
1622 | /* Shortcut for container's root mappings. */ |
1623 | if (id == 0) { | |
1624 | if (idtype == ID_TYPE_UID) | |
1625 | return conf->root_nsuid_map; | |
1626 | ||
1627 | if (idtype == ID_TYPE_GID) | |
1628 | return conf->root_nsgid_map; | |
1629 | } | |
1630 | ||
0589d744 | 1631 | list_for_each_entry(map, &conf->id_map, head) { |
f4900711 CB |
1632 | if (map->idtype != idtype) |
1633 | continue; | |
1634 | ||
1635 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1636 | retmap = map; | |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | ||
1641 | return retmap; | |
1642 | } | |
1643 | ||
42c0d056 | 1644 | static int lxc_recv_devpts_from_child(struct lxc_handler *handler) |
68f3899e CB |
1645 | { |
1646 | int ret; | |
1647 | ||
1648 | if (handler->conf->pty_max <= 0) | |
1649 | return 0; | |
1650 | ||
d17c815d CB |
1651 | ret = lxc_abstract_unix_recv_one_fd(handler->data_sock[1], |
1652 | &handler->conf->devpts_fd, | |
1653 | &handler->conf->devpts_fd, | |
1654 | sizeof(handler->conf->devpts_fd)); | |
68f3899e CB |
1655 | if (ret < 0) |
1656 | return log_error_errno(-1, errno, "Failed to receive devpts fd from child"); | |
1657 | ||
1658 | TRACE("Received devpts file descriptor %d from child", handler->conf->devpts_fd); | |
1659 | return 0; | |
1660 | } | |
1661 | ||
96a980e1 | 1662 | static int lxc_setup_devpts_child(struct lxc_handler *handler) |
289b707b | 1663 | { |
96a980e1 | 1664 | __do_close int devpts_fd = -EBADF, fd_fs = -EBADF; |
289b707b | 1665 | struct lxc_conf *conf = handler->conf; |
f30fc74d | 1666 | struct lxc_rootfs *rootfs = &conf->rootfs; |
03585adc | 1667 | size_t pty_max = conf->pty_max; |
289b707b CB |
1668 | int ret; |
1669 | ||
03585adc CB |
1670 | pty_max += conf->ttys.max; |
1671 | if (pty_max <= 0) | |
1672 | return log_debug(0, "No new devpts instance will be mounted since no pts devices are required"); | |
289b707b | 1673 | |
f30fc74d CB |
1674 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), |
1675 | "/proc/self/fd/%d/pts", rootfs->dfd_dev); | |
1676 | if (ret < 0) | |
1677 | return syserror("Failed to create path"); | |
1678 | ||
1679 | (void)umount2(rootfs->buf, MNT_DETACH); | |
1680 | ||
1681 | /* Create mountpoint for devpts instance. */ | |
1682 | ret = mkdirat(rootfs->dfd_dev, "pts", 0755); | |
1683 | if (ret < 0 && errno != EEXIST) | |
1684 | return log_error_errno(-1, errno, "Failed to create \"/dev/pts\" directory"); | |
1685 | ||
96a980e1 CB |
1686 | if (can_use_mount_api()) { |
1687 | fd_fs = fs_prepare("devpts", -EBADF, "", 0, 0); | |
1688 | if (fd_fs < 0) | |
1689 | return syserror("Failed to prepare filesystem context for devpts"); | |
289b707b | 1690 | |
96a980e1 CB |
1691 | ret = fs_set_property(fd_fs, "source", "devpts"); |
1692 | if (ret < 0) | |
1693 | SYSTRACE("Failed to set \"source=devpts\" on devpts filesystem context %d", fd_fs); | |
289b707b | 1694 | |
96a980e1 CB |
1695 | ret = fs_set_property(fd_fs, "gid", "5"); |
1696 | if (ret < 0) | |
1697 | SYSTRACE("Failed to set \"gid=5\" on devpts filesystem context %d", fd_fs); | |
289b707b | 1698 | |
96a980e1 CB |
1699 | ret = fs_set_flag(fd_fs, "newinstance"); |
1700 | if (ret < 0) | |
1701 | return syserror("Failed to set \"newinstance\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1702 | |
96a980e1 CB |
1703 | ret = fs_set_property(fd_fs, "ptmxmode", "0666"); |
1704 | if (ret < 0) | |
1705 | return syserror("Failed to set \"ptmxmode=0666\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1706 | |
96a980e1 CB |
1707 | ret = fs_set_property(fd_fs, "mode", "0620"); |
1708 | if (ret < 0) | |
1709 | return syserror("Failed to set \"mode=0620\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1710 | |
03585adc | 1711 | ret = fs_set_property(fd_fs, "max", fdstr(pty_max)); |
96a980e1 CB |
1712 | if (ret < 0) |
1713 | return syserror("Failed to set \"max=%zu\" property on devpts filesystem context %d", conf->pty_max, fd_fs); | |
f30fc74d | 1714 | |
96a980e1 CB |
1715 | ret = fsconfig(fd_fs, FSCONFIG_CMD_CREATE, NULL, NULL, 0); |
1716 | if (ret < 0) | |
1717 | return syserror("Failed to finalize filesystem context %d", fd_fs); | |
289b707b | 1718 | |
96a980e1 CB |
1719 | devpts_fd = fsmount(fd_fs, FSMOUNT_CLOEXEC, MOUNT_ATTR_NOSUID | MOUNT_ATTR_NOEXEC); |
1720 | if (devpts_fd < 0) | |
1721 | return syserror("Failed to create new mount for filesystem context %d", fd_fs); | |
1722 | TRACE("Created detached devpts mount %d", devpts_fd); | |
77890c6d | 1723 | |
96a980e1 CB |
1724 | ret = move_mount(devpts_fd, "", rootfs->dfd_dev, "pts", MOVE_MOUNT_F_EMPTY_PATH); |
1725 | if (ret) | |
1726 | return syserror("Failed to attach devpts mount %d to %d/pts", conf->devpts_fd, rootfs->dfd_dev); | |
3c26f34e | 1727 | |
96a980e1 CB |
1728 | DEBUG("Attached detached devpts mount %d to %d/pts", devpts_fd, rootfs->dfd_dev); |
1729 | } else { | |
1730 | char **opts; | |
1731 | char devpts_mntopts[256]; | |
1732 | char *mntopt_sets[5]; | |
1733 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
7e40254a | 1734 | |
f30fc74d CB |
1735 | /* |
1736 | * Fallback codepath in case the new mount API can't be used to | |
1737 | * create detached mounts. | |
1738 | */ | |
1739 | ||
289b707b | 1740 | ret = strnprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
03585adc | 1741 | default_devpts_mntopts, pty_max); |
289b707b CB |
1742 | if (ret < 0) |
1743 | return -1; | |
3c26f34e | 1744 | |
289b707b CB |
1745 | /* Create mountpoint for devpts instance. */ |
1746 | ret = mkdirat(rootfs->dfd_dev, "pts", 0755); | |
1747 | if (ret < 0 && errno != EEXIST) | |
1748 | return log_error_errno(-1, errno, "Failed to create \"/dev/pts\" directory"); | |
ce155c60 | 1749 | |
289b707b CB |
1750 | /* gid=5 && max= */ |
1751 | mntopt_sets[0] = devpts_mntopts; | |
ce155c60 | 1752 | |
289b707b CB |
1753 | /* !gid=5 && max= */ |
1754 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; | |
ce155c60 | 1755 | |
289b707b CB |
1756 | /* gid=5 && !max= */ |
1757 | mntopt_sets[2] = default_devpts_mntopts; | |
ce155c60 | 1758 | |
289b707b CB |
1759 | /* !gid=5 && !max= */ |
1760 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; | |
ce155c60 | 1761 | |
289b707b CB |
1762 | /* end */ |
1763 | mntopt_sets[4] = NULL; | |
70761e5e | 1764 | |
289b707b CB |
1765 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { |
1766 | /* mount new devpts instance */ | |
8b0ccdaa CB |
1767 | ret = mount_at(rootfs->dfd_dev, "", 0, |
1768 | rootfs->dfd_dev, "pts", PROTECT_LOOKUP_BENEATH, | |
1769 | "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
289b707b CB |
1770 | if (ret == 0) |
1771 | break; | |
1772 | } | |
289b707b CB |
1773 | if (ret < 0) |
1774 | return log_error_errno(-1, errno, "Failed to mount new devpts instance"); | |
1775 | ||
1776 | devpts_fd = open_at(rootfs->dfd_dev, "pts", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
1777 | if (devpts_fd < 0) { | |
1778 | devpts_fd = -EBADF; | |
1779 | TRACE("Failed to create detached devpts mount"); | |
1780 | } | |
1781 | ||
289b707b CB |
1782 | DEBUG("Mounted new devpts instance with options \"%s\"", *opts); |
1783 | } | |
03585adc | 1784 | |
96a980e1 | 1785 | handler->conf->devpts_fd = move_fd(devpts_fd); |
f797f05e | 1786 | |
03585adc CB |
1787 | /* |
1788 | * In order to allocate terminal devices the devpts filesystem will | |
1789 | * have to be attached to the filesystem at least ones in the new mount | |
1790 | * api. The reason is lengthy but the gist is that until the new mount | |
1791 | * has been attached to the filesystem it is a detached mount with an | |
1792 | * anonymous mount mamespace attached to it for which the kernel | |
1793 | * refuses certain operations. | |
1794 | * We end up here if the user has requested to allocate tty devices | |
1795 | * while not requestig pty devices be made available to the container. | |
1796 | * We only need the devpts_fd to allocate tty devices. | |
1797 | */ | |
1798 | if (conf->pty_max <= 0) | |
1799 | return 0; | |
1800 | ||
d5cb35d6 | 1801 | /* Remove any pre-existing /dev/ptmx file. */ |
a5a08920 | 1802 | ret = unlinkat(rootfs->dfd_dev, "ptmx", 0); |
b29e05d6 | 1803 | if (ret < 0) { |
55022530 CB |
1804 | if (errno != ENOENT) |
1805 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\" file"); | |
b29e05d6 | 1806 | } else { |
0fd73091 | 1807 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1808 | } |
1809 | ||
8de0119d | 1810 | /* Create placeholder /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
a5a08920 | 1811 | ret = mknodat(rootfs->dfd_dev, "ptmx", S_IFREG | 0000, 0); |
55022530 | 1812 | if (ret < 0 && errno != EEXIST) |
8de0119d CB |
1813 | return log_error_errno(-1, errno, "Failed to create \"/dev/ptmx\" file as bind mount target"); |
1814 | DEBUG("Created \"/dev/ptmx\" file as bind mount target"); | |
77890c6d | 1815 | |
d27ae999 | 1816 | /* Main option: use a bind-mount to please AppArmor */ |
8b0ccdaa CB |
1817 | ret = mount_at(rootfs->dfd_dev, "pts/ptmx", (PROTECT_LOOKUP_BENEATH_WITH_SYMLINKS & ~RESOLVE_NO_XDEV), |
1818 | rootfs->dfd_dev, "ptmx", (PROTECT_LOOKUP_BENEATH_WITH_SYMLINKS & ~RESOLVE_NO_XDEV), | |
1819 | NULL, MS_BIND, NULL); | |
55022530 CB |
1820 | if (!ret) |
1821 | return log_debug(0, "Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1822 | else | |
d5cb35d6 | 1823 | /* Fallthrough and try to create a symlink. */ |
0fd73091 | 1824 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 | 1825 | |
8de0119d | 1826 | /* Remove the placeholder /dev/ptmx file we created above. */ |
a5a08920 | 1827 | ret = unlinkat(rootfs->dfd_dev, "ptmx", 0); |
55022530 CB |
1828 | if (ret < 0) |
1829 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\""); | |
d5cb35d6 CB |
1830 | |
1831 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
06853427 | 1832 | ret = symlinkat("/dev/pts/ptmx", rootfs->dfd_dev, "dev/ptmx"); |
55022530 CB |
1833 | if (ret < 0) |
1834 | return log_error_errno(-1, errno, "Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); | |
cd54d859 | 1835 | |
185b9ee9 | 1836 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1837 | return 0; |
1838 | } | |
1839 | ||
03585adc CB |
1840 | static int lxc_finish_devpts_child(struct lxc_handler *handler) |
1841 | { | |
1842 | struct lxc_conf *conf = handler->conf; | |
1843 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
1844 | int ret; | |
1845 | ||
1846 | if (conf->pty_max > 0) | |
1847 | return 0; | |
1848 | ||
1849 | /* | |
1850 | * We end up here if the user has requested to allocate tty devices | |
1851 | * while not requestig pty devices be made available to the container. | |
1852 | * This means we can unmount the devpts instance. We only need the | |
1853 | * devpts_fd to allocate tty devices. | |
1854 | */ | |
1855 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), | |
1856 | "/proc/self/fd/%d/pts", rootfs->dfd_dev); | |
1857 | if (ret < 0) | |
1858 | return syserror("Failed to create path"); | |
1859 | ||
1860 | close_prot_errno_disarm(conf->devpts_fd); | |
1861 | return umount2(rootfs->buf, MNT_DETACH); | |
1862 | } | |
1863 | ||
111ed96e | 1864 | static int lxc_send_devpts_to_parent(struct lxc_handler *handler) |
1b82d721 CB |
1865 | { |
1866 | int ret; | |
1867 | ||
1868 | if (handler->conf->pty_max <= 0) | |
1869 | return log_debug(0, "No devpts file descriptor will be sent since no pts devices are requested"); | |
1870 | ||
1871 | ret = lxc_abstract_unix_send_fds(handler->data_sock[0], &handler->conf->devpts_fd, 1, NULL, 0); | |
1872 | if (ret < 0) | |
1873 | SYSERROR("Failed to send devpts file descriptor %d to parent", handler->conf->devpts_fd); | |
1874 | else | |
1875 | TRACE("Sent devpts file descriptor %d to parent", handler->conf->devpts_fd); | |
1876 | ||
1877 | close_prot_errno_disarm(handler->conf->devpts_fd); | |
1878 | ||
1879 | return 0; | |
1880 | } | |
1881 | ||
64a04c84 | 1882 | static int setup_personality(personality_t persona) |
cccc74b5 | 1883 | { |
0fd73091 CB |
1884 | int ret; |
1885 | ||
9c601e1f CB |
1886 | if (persona == LXC_ARCH_UNCHANGED) |
1887 | return log_debug(0, "Retaining original personality"); | |
cccc74b5 | 1888 | |
64a04c84 | 1889 | ret = lxc_personality(persona); |
55022530 | 1890 | if (ret < 0) |
9c601e1f | 1891 | return syserror("Failed to set personality to \"0lx%lx\"", persona); |
cccc74b5 | 1892 | |
38608992 | 1893 | INFO("Set personality to \"0lx%lx\"", persona); |
cccc74b5 DL |
1894 | return 0; |
1895 | } | |
1896 | ||
9f77617b | 1897 | static int bind_mount_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 1898 | struct lxc_terminal *console, int fd_to) |
37c74fd1 CB |
1899 | { |
1900 | __do_close int fd_pty = -EBADF; | |
1901 | ||
1902 | if (is_empty_string(console->name)) | |
1903 | return ret_errno(EINVAL); | |
1904 | ||
1905 | /* | |
1906 | * When the pty fd stashed in console->pty has been retrieved via the | |
1907 | * TIOCGPTPEER ioctl() to avoid dangerous path-based lookups when | |
1908 | * allocating new pty devices we can't reopen it through openat2() or | |
1909 | * created a detached mount through open_tree() from it. This means we | |
1910 | * would need to mount using the path stased in console->name which is | |
1911 | * unsafe. We could be mounting a device that isn't identical to the | |
1912 | * one we've already safely opened and stashed in console->pty. | |
1913 | * So, what we do is we open an O_PATH file descriptor for | |
1914 | * console->name and verify that the opened fd and the fd we stashed in | |
1915 | * console->pty refer to the same device. If they do we can go on and | |
1916 | * created a detached mount based on the newly opened O_PATH file | |
1917 | * descriptor and then safely mount. | |
1918 | */ | |
9f77617b | 1919 | fd_pty = open_at_same(console->pty, fd_devpts, fdstr(console->pty_nr), |
d94a7f09 | 1920 | PROTECT_OPATH_FILE, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); |
37c74fd1 | 1921 | if (fd_pty < 0) |
d94a7f09 | 1922 | return syserror("Failed to open \"%s\"", console->name); |
37c74fd1 CB |
1923 | |
1924 | /* | |
1925 | * Note, there are intentionally no open or lookup restrictions since | |
1926 | * we're operating directly on the fd. | |
1927 | */ | |
d94a7f09 | 1928 | if (can_use_mount_api()) |
704cadd5 | 1929 | return fd_bind_mount(fd_pty, "", 0, 0, fd_to, "", 0, 0, 0, 0, 0, false); |
d94a7f09 CB |
1930 | |
1931 | return mount_fd(fd_pty, fd_to, "none", MS_BIND, 0); | |
37c74fd1 CB |
1932 | } |
1933 | ||
9f77617b | 1934 | static int lxc_setup_dev_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 1935 | struct lxc_terminal *console) |
6e590161 | 1936 | { |
af0cf9b7 | 1937 | __do_close int fd_console = -EBADF; |
882671aa | 1938 | int ret; |
52e35957 | 1939 | |
cf68ffd9 CB |
1940 | /* |
1941 | * When we are asked to setup a console we remove any previous | |
8b1b1210 CB |
1942 | * /dev/console bind-mounts. |
1943 | */ | |
a5a08920 | 1944 | if (exists_file_at(rootfs->dfd_dev, "console")) { |
af0cf9b7 CB |
1945 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
1946 | ||
9bcde680 CB |
1947 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/dev/console", rootfs_path); |
1948 | if (ret < 0) | |
953db219 CB |
1949 | return -1; |
1950 | ||
58b38111 | 1951 | ret = lxc_unstack_mountpoint(rootfs->buf, false); |
55022530 | 1952 | if (ret < 0) |
58b38111 | 1953 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", rootfs->buf); |
55022530 | 1954 | else |
58b38111 | 1955 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, rootfs->buf); |
8b1b1210 CB |
1956 | } |
1957 | ||
cf68ffd9 CB |
1958 | /* |
1959 | * For unprivileged containers autodev or automounts will already have | |
8b1b1210 CB |
1960 | * taken care of creating /dev/console. |
1961 | */ | |
d94a7f09 CB |
1962 | fd_console = open_at(rootfs->dfd_dev, |
1963 | "console", | |
1964 | PROTECT_OPEN | O_CREAT, | |
1965 | PROTECT_LOOKUP_BENEATH, | |
1966 | 0000); | |
af0cf9b7 | 1967 | if (fd_console < 0) |
d94a7f09 | 1968 | return syserror("Failed to create \"%d/console\"", rootfs->dfd_dev); |
52e35957 | 1969 | |
1dd71c90 | 1970 | ret = fchmod(console->pty, 0620); |
55022530 | 1971 | if (ret < 0) |
d94a7f09 | 1972 | return syserror("Failed to change console mode"); |
13954cce | 1973 | |
9f77617b | 1974 | ret = bind_mount_console(fd_devpts, rootfs, console, fd_console); |
37c74fd1 | 1975 | if (ret < 0) |
d94a7f09 CB |
1976 | return syserror("Failed to mount \"%d(%s)\" on \"%d\"", |
1977 | console->pty, console->name, fd_console); | |
6e590161 | 1978 | |
d94a7f09 | 1979 | TRACE("Setup console \"%s\"", console->name); |
7c6ef2a2 SH |
1980 | return 0; |
1981 | } | |
1982 | ||
9f77617b | 1983 | static int lxc_setup_ttydir_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 1984 | struct lxc_terminal *console, |
37c74fd1 | 1985 | char *ttydir) |
7c6ef2a2 | 1986 | { |
d94a7f09 CB |
1987 | __do_close int fd_ttydir = -EBADF, fd_dev_console = -EBADF, |
1988 | fd_reg_console = -EBADF, fd_reg_ttydir_console = -EBADF; | |
3b7e332f | 1989 | int ret; |
7c6ef2a2 | 1990 | |
f6370f2a CB |
1991 | /* create dev/<ttydir> */ |
1992 | ret = mkdirat(rootfs->dfd_dev, ttydir, 0755); | |
1993 | if (ret < 0 && errno != EEXIST) | |
1994 | return syserror("Failed to create \"%d/%s\"", rootfs->dfd_dev, ttydir); | |
d94a7f09 CB |
1995 | |
1996 | fd_ttydir = open_at(rootfs->dfd_dev, | |
1997 | ttydir, | |
1998 | PROTECT_OPATH_DIRECTORY, | |
1999 | PROTECT_LOOKUP_BENEATH, | |
2000 | 0); | |
2001 | if (fd_ttydir < 0) | |
2002 | return syserror("Failed to open \"%d/%s\"", rootfs->dfd_dev, ttydir); | |
7c6ef2a2 | 2003 | |
f6370f2a | 2004 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/console", ttydir); |
9bcde680 | 2005 | if (ret < 0) |
3d7d929a CB |
2006 | return -1; |
2007 | ||
f6370f2a | 2008 | /* create dev/<ttydir>/console */ |
d94a7f09 CB |
2009 | fd_reg_ttydir_console = open_at(fd_ttydir, |
2010 | "console", | |
2011 | PROTECT_OPEN | O_CREAT, | |
2012 | PROTECT_LOOKUP_BENEATH, | |
2013 | 0000); | |
2014 | if (fd_reg_ttydir_console < 0) | |
2015 | return syserror("Failed to create \"%d/console\"", fd_ttydir); | |
2a12fefd | 2016 | |
f6370f2a | 2017 | if (file_exists(rootfs->buf)) { |
d94a7f09 CB |
2018 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
2019 | ||
2020 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/dev/console", rootfs_path); | |
2021 | if (ret < 0) | |
2022 | return -1; | |
2023 | ||
f6370f2a | 2024 | ret = lxc_unstack_mountpoint(rootfs->buf, false); |
55022530 | 2025 | if (ret < 0) |
f6370f2a | 2026 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", rootfs->buf); |
55022530 | 2027 | else |
f6370f2a | 2028 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, rootfs->buf); |
3dc035f1 | 2029 | } |
2a12fefd | 2030 | |
d94a7f09 CB |
2031 | /* create dev/console */ |
2032 | fd_reg_console = open_at(rootfs->dfd_dev, | |
2033 | "console", | |
2034 | PROTECT_OPEN | O_CREAT, | |
2035 | PROTECT_LOOKUP_BENEATH, | |
2036 | 0000); | |
2037 | if (fd_reg_console < 0) | |
2038 | return syserror("Failed to create \"%d/console\"", rootfs->dfd_dev); | |
7c6ef2a2 | 2039 | |
1dd71c90 | 2040 | ret = fchmod(console->pty, 0620); |
55022530 | 2041 | if (ret < 0) |
d94a7f09 | 2042 | return syserror("Failed to change console mode"); |
2a12fefd | 2043 | |
d94a7f09 | 2044 | /* bind mount console to '/dev/<ttydir>/console' */ |
9f77617b | 2045 | ret = bind_mount_console(fd_devpts, rootfs, console, fd_reg_ttydir_console); |
55022530 | 2046 | if (ret < 0) |
d94a7f09 CB |
2047 | return syserror("Failed to mount \"%d(%s)\" on \"%d\"", |
2048 | console->pty, console->name, fd_reg_ttydir_console); | |
2049 | ||
2050 | fd_dev_console = open_at_same(console->pty, | |
2051 | fd_ttydir, | |
2052 | "console", | |
2053 | PROTECT_OPATH_FILE, | |
2054 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2055 | 0); | |
2056 | if (fd_dev_console < 0) | |
2057 | return syserror("Failed to open \"%d/console\"", fd_ttydir); | |
2058 | ||
2059 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
2060 | if (can_use_mount_api()) | |
2061 | ret = fd_bind_mount(fd_dev_console, | |
2062 | "", | |
2063 | PROTECT_OPATH_FILE, | |
2064 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2065 | fd_reg_console, | |
2066 | "", | |
2067 | PROTECT_OPATH_FILE, | |
2068 | PROTECT_LOOKUP_BENEATH, | |
2069 | 0, | |
704cadd5 CB |
2070 | 0, |
2071 | 0, | |
d94a7f09 CB |
2072 | false); |
2073 | else | |
2074 | ret = mount_fd(fd_dev_console, fd_reg_console, "none", MS_BIND, 0); | |
55022530 | 2075 | if (ret < 0) |
d94a7f09 CB |
2076 | return syserror("Failed to mount \"%d\" on \"%d\"", |
2077 | fd_dev_console, fd_reg_console); | |
3dc035f1 | 2078 | |
d94a7f09 | 2079 | TRACE("Setup console \"%s\"", console->name); |
6e590161 | 2080 | return 0; |
2081 | } | |
2082 | ||
f3dff080 CB |
2083 | static int lxc_setup_console(const struct lxc_handler *handler, |
2084 | struct lxc_rootfs *rootfs, | |
37c74fd1 | 2085 | struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 2086 | { |
9f77617b CB |
2087 | __do_close int fd_devpts_host = -EBADF; |
2088 | int fd_devpts = handler->conf->devpts_fd; | |
2089 | int ret = -1; | |
3d7d929a | 2090 | |
37c74fd1 CB |
2091 | if (!wants_console(console)) |
2092 | return log_trace(0, "Skipping console setup"); | |
7c6ef2a2 | 2093 | |
9f77617b CB |
2094 | if (console->pty < 0) { |
2095 | /* | |
2096 | * Allocate a console from the container's devpts instance. We | |
2097 | * have checked on the host that we have enough pty devices | |
2098 | * available. | |
2099 | */ | |
2100 | ret = lxc_devpts_terminal(handler->conf->devpts_fd, &console->ptx, | |
18129d94 | 2101 | &console->pty, &console->pty_nr, false); |
9f77617b CB |
2102 | if (ret < 0) |
2103 | return syserror("Failed to allocate console from container's devpts instance"); | |
2104 | ||
2105 | ret = strnprintf(console->name, sizeof(console->name), | |
2106 | "/dev/pts/%d", console->pty_nr); | |
2107 | if (ret < 0) | |
2108 | return syserror("Failed to create console path"); | |
2109 | } else { | |
2110 | /* | |
2111 | * We're using a console from the host's devpts instance. Open | |
2112 | * it again so we can later verify that the console we're | |
2113 | * supposed to use is still the same as the one we opened on | |
2114 | * the host. | |
2115 | */ | |
2116 | fd_devpts_host = open_at(rootfs->dfd_host, | |
2117 | "dev/pts", | |
2118 | PROTECT_OPATH_DIRECTORY, | |
2119 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2120 | 0); | |
2121 | if (fd_devpts_host < 0) | |
2122 | return syserror("Failed to open host devpts"); | |
2123 | ||
2124 | fd_devpts = fd_devpts_host; | |
2125 | } | |
2126 | ||
37c74fd1 | 2127 | if (ttydir) |
9f77617b | 2128 | ret = lxc_setup_ttydir_console(fd_devpts, rootfs, console, ttydir); |
37c74fd1 | 2129 | else |
9f77617b | 2130 | ret = lxc_setup_dev_console(fd_devpts, rootfs, console); |
87dfb724 CB |
2131 | if (ret < 0) |
2132 | return syserror("Failed to setup console"); | |
2133 | ||
f3dff080 CB |
2134 | /* |
2135 | * Some init's such as busybox will set sane tty settings on stdin, | |
2136 | * stdout, stderr which it thinks is the console. We already set them | |
2137 | * the way we wanted on the real terminal, and we want init to do its | |
2138 | * setup on its console ie. the pty allocated in lxc_terminal_setup() so | |
2139 | * make sure that that pty is stdin,stdout,stderr. | |
2140 | */ | |
9f77617b | 2141 | if (console->pty >= 0) { |
f3dff080 | 2142 | if (handler->daemonize || !handler->conf->is_execute) |
9f77617b | 2143 | ret = set_stdfds(console->pty); |
f3dff080 | 2144 | else |
9f77617b | 2145 | ret = lxc_terminal_set_stdfds(console->pty); |
f3dff080 | 2146 | if (ret < 0) |
9f77617b CB |
2147 | return syserror("Failed to redirect std{in,out,err} to pty file descriptor %d", console->pty); |
2148 | ||
2149 | /* | |
2150 | * If the console has been allocated from the host's devpts | |
2151 | * we're done and we don't need to send fds to the parent. | |
2152 | */ | |
2153 | if (fd_devpts_host >= 0) | |
2154 | lxc_terminal_delete(console); | |
f3dff080 CB |
2155 | } |
2156 | ||
37c74fd1 | 2157 | return ret; |
7c6ef2a2 SH |
2158 | } |
2159 | ||
a08bfbe3 | 2160 | static int parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 | 2161 | { |
a08bfbe3 | 2162 | ssize_t ret; |
998ac676 | 2163 | |
85c2de39 MB |
2164 | /* If '=' is contained in opt, the option must go into data. */ |
2165 | if (!strchr(opt, '=')) { | |
a08bfbe3 CB |
2166 | /* |
2167 | * If opt is found in mount_opt, set or clear flags. | |
2168 | * Otherwise append it to data. | |
2169 | */ | |
85c2de39 | 2170 | size_t opt_len = strlen(opt); |
a08bfbe3 | 2171 | for (struct mount_opt *mo = &mount_opt[0]; mo->name != NULL; mo++) { |
85c2de39 | 2172 | size_t mo_name_len = strlen(mo->name); |
a08bfbe3 | 2173 | |
eed95eb0 | 2174 | if (opt_len == mo_name_len && strnequal(opt, mo->name, mo_name_len)) { |
85c2de39 | 2175 | if (mo->clear) |
1e4bce2c | 2176 | *flags &= ~mo->legacy_flag; |
85c2de39 | 2177 | else |
1e4bce2c | 2178 | *flags |= mo->legacy_flag; |
a08bfbe3 | 2179 | return 0; |
85c2de39 | 2180 | } |
998ac676 RT |
2181 | } |
2182 | } | |
2183 | ||
a08bfbe3 CB |
2184 | if (strlen(*data)) { |
2185 | ret = strlcat(*data, ",", size); | |
2186 | if (ret < 0) | |
2187 | return log_error_errno(ret, errno, "Failed to append \",\" to %s", *data); | |
2188 | } | |
2189 | ||
2190 | ret = strlcat(*data, opt, size); | |
2191 | if (ret < 0) | |
2192 | return log_error_errno(ret, errno, "Failed to append \"%s\" to %s", opt, *data); | |
efed99a4 | 2193 | |
a08bfbe3 | 2194 | return 0; |
998ac676 RT |
2195 | } |
2196 | ||
d94eb390 | 2197 | int parse_mntopts_legacy(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 2198 | { |
a08bfbe3 CB |
2199 | __do_free char *mntopts_new = NULL, *mntopts_dup = NULL; |
2200 | char *mntopt_cur = NULL; | |
efed99a4 | 2201 | size_t size; |
998ac676 | 2202 | |
a08bfbe3 CB |
2203 | if (*mntdata || *mntflags) |
2204 | return ret_errno(EINVAL); | |
911324ef DL |
2205 | |
2206 | if (!mntopts) | |
998ac676 RT |
2207 | return 0; |
2208 | ||
a08bfbe3 CB |
2209 | mntopts_dup = strdup(mntopts); |
2210 | if (!mntopts_dup) | |
2211 | return ret_errno(ENOMEM); | |
998ac676 | 2212 | |
a08bfbe3 CB |
2213 | size = strlen(mntopts_dup) + 1; |
2214 | mntopts_new = zalloc(size); | |
2215 | if (!mntopts_new) | |
2216 | return ret_errno(ENOMEM); | |
998ac676 | 2217 | |
a08bfbe3 CB |
2218 | lxc_iterate_parts(mntopt_cur, mntopts_dup, ",") |
2219 | if (parse_mntopt(mntopt_cur, mntflags, &mntopts_new, size) < 0) | |
2220 | return ret_errno(EINVAL); | |
998ac676 | 2221 | |
a08bfbe3 CB |
2222 | if (*mntopts_new) |
2223 | *mntdata = move_ptr(mntopts_new); | |
998ac676 RT |
2224 | |
2225 | return 0; | |
2226 | } | |
2227 | ||
1b82d721 CB |
2228 | static int parse_vfs_attr(struct lxc_mount_options *opts, char *opt, size_t size) |
2229 | { | |
2230 | /* | |
2231 | * If opt is found in mount_opt, set or clear flags. | |
2232 | * Otherwise append it to data. | |
2233 | */ | |
2234 | for (struct mount_opt *mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
2235 | if (!strnequal(opt, mo->name, strlen(mo->name))) | |
2236 | continue; | |
2237 | ||
2238 | /* This is a recursive bind-mount. */ | |
2239 | if (strequal(mo->name, "rbind")) { | |
3eb23230 | 2240 | opts->bind_recursively = 1; |
1b82d721 | 2241 | opts->bind = 1; |
0f43436c | 2242 | opts->mnt_flags |= mo->legacy_flag; /* MS_BIND | MS_REC */ |
1b82d721 CB |
2243 | return 0; |
2244 | } | |
2245 | ||
2246 | /* This is a bind-mount. */ | |
2247 | if (strequal(mo->name, "bind")) { | |
2248 | opts->bind = 1; | |
0f43436c | 2249 | opts->mnt_flags |= mo->legacy_flag; /* MS_BIND */ |
1b82d721 CB |
2250 | return 0; |
2251 | } | |
2252 | ||
2253 | if (mo->flag == ~0) | |
2254 | return log_info(0, "Ignoring %s mount option", mo->name); | |
2255 | ||
2256 | if (mo->clear) { | |
2257 | opts->attr.attr_clr |= mo->flag; | |
0f43436c | 2258 | opts->mnt_flags &= ~mo->legacy_flag; |
1b82d721 CB |
2259 | TRACE("Lowering %s", mo->name); |
2260 | } else { | |
2261 | opts->attr.attr_set |= mo->flag; | |
0f43436c | 2262 | opts->mnt_flags |= mo->legacy_flag; |
1b82d721 CB |
2263 | TRACE("Raising %s", mo->name); |
2264 | } | |
2265 | ||
2266 | return 0; | |
2267 | } | |
2268 | ||
0f43436c | 2269 | for (struct mount_opt *mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
1b82d721 CB |
2270 | if (!strnequal(opt, mo->name, strlen(mo->name))) |
2271 | continue; | |
2272 | ||
6b48a575 CB |
2273 | if (strequal(mo->name, "rslave") || |
2274 | strequal(mo->name, "rshared") || | |
2275 | strequal(mo->name, "runbindable") || | |
2276 | strequal(mo->name, "rprivate")) | |
2277 | opts->propagate_recursively = 1; | |
2278 | ||
1b82d721 | 2279 | opts->attr.propagation = mo->flag; |
6b48a575 | 2280 | opts->prop_flags |= mo->legacy_flag; |
1b82d721 CB |
2281 | return 0; |
2282 | } | |
2283 | ||
2284 | return 0; | |
2285 | } | |
2286 | ||
704cadd5 | 2287 | int parse_mount_attrs(struct lxc_mount_options *opts, const char *mntopts) |
1b82d721 CB |
2288 | { |
2289 | __do_free char *mntopts_new = NULL, *mntopts_dup = NULL; | |
380fcc08 | 2290 | char *end = NULL, *mntopt_cur = NULL; |
1b82d721 CB |
2291 | int ret; |
2292 | size_t size; | |
2293 | ||
2294 | if (!opts) | |
2295 | return ret_errno(EINVAL); | |
2296 | ||
2297 | if (!mntopts) | |
2298 | return 0; | |
2299 | ||
2300 | mntopts_dup = strdup(mntopts); | |
2301 | if (!mntopts_dup) | |
2302 | return ret_errno(ENOMEM); | |
2303 | ||
2304 | size = strlen(mntopts_dup) + 1; | |
2305 | mntopts_new = zalloc(size); | |
2306 | if (!mntopts_new) | |
2307 | return ret_errno(ENOMEM); | |
2308 | ||
2309 | lxc_iterate_parts(mntopt_cur, mntopts_dup, ",") { | |
1b82d721 CB |
2310 | /* This is a filesystem specific option. */ |
2311 | if (strchr(mntopt_cur, '=')) { | |
2312 | if (!end) { | |
2313 | end = stpcpy(mntopts_new, mntopt_cur); | |
2314 | } else { | |
2315 | end = stpcpy(end, ","); | |
2316 | end = stpcpy(end, mntopt_cur); | |
2317 | } | |
2318 | ||
2319 | continue; | |
2320 | } | |
2321 | ||
2322 | /* This is a generic vfs option. */ | |
2323 | ret = parse_vfs_attr(opts, mntopt_cur, size); | |
2324 | if (ret < 0) | |
2325 | return syserror("Failed to parse mount attributes: \"%s\"", mntopt_cur); | |
2326 | } | |
2327 | ||
2328 | if (*mntopts_new) | |
2329 | opts->data = move_ptr(mntopts_new); | |
2330 | ||
2331 | return 0; | |
2332 | } | |
2333 | ||
d840039e YT |
2334 | static void parse_propagationopt(char *opt, unsigned long *flags) |
2335 | { | |
2336 | struct mount_opt *mo; | |
2337 | ||
2338 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 2339 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
eed95eb0 | 2340 | if (!strnequal(opt, mo->name, strlen(mo->name))) |
0fd73091 CB |
2341 | continue; |
2342 | ||
2343 | if (mo->clear) | |
1e4bce2c | 2344 | *flags &= ~mo->legacy_flag; |
0fd73091 | 2345 | else |
1e4bce2c | 2346 | *flags |= mo->legacy_flag; |
0fd73091 CB |
2347 | |
2348 | return; | |
d840039e YT |
2349 | } |
2350 | } | |
2351 | ||
8ce1abc2 | 2352 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 2353 | { |
dfd2e059 CB |
2354 | __do_free char *s = NULL; |
2355 | char *p; | |
d840039e YT |
2356 | |
2357 | if (!mntopts) | |
2358 | return 0; | |
2359 | ||
2360 | s = strdup(mntopts); | |
55022530 CB |
2361 | if (!s) |
2362 | return log_error_errno(-ENOMEM, errno, "Failed to allocate memory"); | |
d840039e | 2363 | |
0fd73091 | 2364 | *pflags = 0L; |
8db9d26f | 2365 | lxc_iterate_parts(p, s, ",") |
d840039e | 2366 | parse_propagationopt(p, pflags); |
0fd73091 | 2367 | |
d840039e YT |
2368 | return 0; |
2369 | } | |
2370 | ||
6fd5e769 SH |
2371 | static void null_endofword(char *word) |
2372 | { | |
2373 | while (*word && *word != ' ' && *word != '\t') | |
2374 | word++; | |
2375 | *word = '\0'; | |
2376 | } | |
2377 | ||
0fd73091 | 2378 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
2379 | static char *get_field(char *src, int nfields) |
2380 | { | |
6fd5e769 | 2381 | int i; |
0fd73091 | 2382 | char *p = src; |
6fd5e769 SH |
2383 | |
2384 | for (i = 0; i < nfields; i++) { | |
2385 | while (*p && *p != ' ' && *p != '\t') | |
2386 | p++; | |
0fd73091 | 2387 | |
6fd5e769 SH |
2388 | if (!*p) |
2389 | break; | |
0fd73091 | 2390 | |
6fd5e769 SH |
2391 | p++; |
2392 | } | |
0fd73091 | 2393 | |
6fd5e769 SH |
2394 | return p; |
2395 | } | |
2396 | ||
911324ef DL |
2397 | static int mount_entry(const char *fsname, const char *target, |
2398 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
2399 | unsigned long pflags, const char *data, bool optional, |
2400 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2401 | { |
0ac4b28a | 2402 | int ret; |
6b5a54cd | 2403 | char srcbuf[PATH_MAX]; |
181437fd | 2404 | const char *srcpath = fsname; |
614305f3 | 2405 | #ifdef HAVE_STATVFS |
2938f7c8 | 2406 | struct statvfs sb; |
614305f3 | 2407 | #endif |
2938f7c8 | 2408 | |
181437fd | 2409 | if (relative) { |
9bcde680 CB |
2410 | ret = strnprintf(srcbuf, sizeof(srcbuf), "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
2411 | if (ret < 0) | |
55022530 | 2412 | return log_error_errno(-1, errno, "source path is too long"); |
181437fd YT |
2413 | srcpath = srcbuf; |
2414 | } | |
2415 | ||
2416 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2417 | rootfs); |
2418 | if (ret < 0) { | |
55022530 CB |
2419 | if (optional) |
2420 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
2421 | srcpath ? srcpath : "(null)", target); | |
0ac4b28a | 2422 | |
55022530 CB |
2423 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", |
2424 | srcpath ? srcpath : "(null)", target); | |
911324ef DL |
2425 | } |
2426 | ||
2427 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
0ac4b28a | 2428 | |
55022530 CB |
2429 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount options", |
2430 | srcpath ? srcpath : "(none)", target ? target : "(none)"); | |
0ac4b28a | 2431 | |
614305f3 | 2432 | #ifdef HAVE_STATVFS |
181437fd | 2433 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
94bef7e4 TA |
2434 | unsigned long required_flags = 0; |
2435 | ||
2938f7c8 SH |
2436 | if (sb.f_flag & MS_NOSUID) |
2437 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2438 | |
ae7a770e | 2439 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2440 | required_flags |= MS_NODEV; |
0ac4b28a | 2441 | |
2938f7c8 SH |
2442 | if (sb.f_flag & MS_RDONLY) |
2443 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2444 | |
2938f7c8 SH |
2445 | if (sb.f_flag & MS_NOEXEC) |
2446 | required_flags |= MS_NOEXEC; | |
0ac4b28a | 2447 | |
55022530 CB |
2448 | DEBUG("Flags for \"%s\" were %lu, required extra flags are %lu", |
2449 | srcpath, sb.f_flag, required_flags); | |
0ac4b28a CB |
2450 | |
2451 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2452 | * does not have any flags which are not already in |
0ac4b28a | 2453 | * mountflags, then skip the remount. |
2938f7c8 | 2454 | */ |
94bef7e4 TA |
2455 | if (!(mountflags & MS_REMOUNT) && |
2456 | (!(required_flags & ~mountflags) && !(mountflags & MS_RDONLY))) { | |
15f3e22b CB |
2457 | DEBUG("Mountflags already were %lu, skipping remount", mountflags); |
2458 | goto skipremount; | |
2938f7c8 | 2459 | } |
0ac4b28a | 2460 | |
2938f7c8 | 2461 | mountflags |= required_flags; |
6fd5e769 | 2462 | } |
614305f3 | 2463 | #endif |
911324ef | 2464 | |
181437fd | 2465 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2466 | if (ret < 0) { |
55022530 CB |
2467 | if (optional) |
2468 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
2469 | srcpath ? srcpath : "(null)", | |
2470 | target); | |
2471 | ||
2472 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", | |
2473 | srcpath ? srcpath : "(null)", | |
2474 | target); | |
911324ef DL |
2475 | } |
2476 | } | |
2477 | ||
a3ed9b81 | 2478 | #ifdef HAVE_STATVFS |
2479 | skipremount: | |
2480 | #endif | |
d840039e YT |
2481 | if (pflags) { |
2482 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2483 | if (ret < 0) { | |
55022530 CB |
2484 | if (optional) |
2485 | return log_info_errno(0, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
2486 | else | |
2487 | return log_error_errno(-1, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
d840039e YT |
2488 | } |
2489 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2490 | } | |
2491 | ||
0103eb53 | 2492 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2493 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2494 | |
2495 | return 0; | |
2496 | } | |
2497 | ||
0b932f9d CB |
2498 | const char *lxc_mount_options_info[LXC_MOUNT_MAX] = { |
2499 | "create=dir", | |
2500 | "create=file", | |
2501 | "optional", | |
2502 | "relative", | |
f6815906 | 2503 | "idmap=", |
0b932f9d CB |
2504 | }; |
2505 | ||
c5e30de4 | 2506 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
1b82d721 | 2507 | int parse_lxc_mount_attrs(struct lxc_mount_options *opts, char *mnt_opts) |
4e4ca161 | 2508 | { |
0b932f9d | 2509 | for (size_t i = LXC_MOUNT_CREATE_DIR; i < LXC_MOUNT_MAX; i++) { |
8e05f350 | 2510 | __do_close int fd_userns = -EBADF; |
0b932f9d | 2511 | const char *opt_name = lxc_mount_options_info[i]; |
f6815906 | 2512 | size_t len; |
d97d9e9f | 2513 | char *idmap_path, *opt, *opt_next; |
c5e30de4 | 2514 | |
d97d9e9f CB |
2515 | opt = strstr(mnt_opts, opt_name); |
2516 | if (!opt) | |
4e4ca161 | 2517 | continue; |
c5e30de4 | 2518 | |
0b932f9d CB |
2519 | switch (i) { |
2520 | case LXC_MOUNT_CREATE_DIR: | |
2521 | opts->create_dir = 1; | |
2522 | break; | |
2523 | case LXC_MOUNT_CREATE_FILE: | |
2524 | opts->create_file = 1; | |
2525 | break; | |
2526 | case LXC_MOUNT_OPTIONAL: | |
2527 | opts->optional = 1; | |
2528 | break; | |
2529 | case LXC_MOUNT_RELATIVE: | |
2530 | opts->relative = 1; | |
2531 | break; | |
f6815906 | 2532 | case LXC_MOUNT_IDMAP: |
d97d9e9f CB |
2533 | opt_next = opt; |
2534 | opt_next += STRLITERALLEN("idmap="); | |
2535 | idmap_path = strchrnul(opt_next, ','); | |
2e5c468a | 2536 | len = idmap_path - opt_next + 1; |
f6815906 | 2537 | |
f6815906 | 2538 | if (len >= sizeof(opts->userns_path)) |
16fcdacc CB |
2539 | return syserror_set(-EIO, "Excessive idmap path length for \"idmap=<path>\" LXC specific mount option"); |
2540 | ||
1b82d721 | 2541 | strlcpy(opts->userns_path, opt_next, len); |
2e5c468a | 2542 | |
16fcdacc CB |
2543 | if (is_empty_string(opts->userns_path)) |
2544 | return syserror_set(-EINVAL, "Missing idmap path for \"idmap=<path>\" LXC specific mount option"); | |
2545 | ||
1b82d721 | 2546 | if (!strequal(opts->userns_path, "container")) { |
4b875ef9 CB |
2547 | fd_userns = open(opts->userns_path, O_RDONLY | O_NOCTTY | O_CLOEXEC); |
2548 | if (fd_userns < 0) | |
1b82d721 | 2549 | return syserror("Failed to open user namespace %s", opts->userns_path); |
4b875ef9 | 2550 | } |
e26cf563 CB |
2551 | |
2552 | TRACE("Parse LXC specific mount option %d->\"idmap=%s\"", fd_userns, opts->userns_path); | |
f6815906 | 2553 | break; |
0b932f9d | 2554 | default: |
16fcdacc | 2555 | return syserror_set(-EINVAL, "Unknown LXC specific mount option"); |
4e4ca161 | 2556 | } |
c5e30de4 | 2557 | |
d97d9e9f CB |
2558 | opt_next = strchr(opt, ','); |
2559 | if (!opt_next) | |
2560 | *opt = '\0'; /* no more mntopts, so just chop it here */ | |
0b932f9d | 2561 | else |
d97d9e9f | 2562 | memmove(opt, opt_next + 1, strlen(opt_next + 1) + 1); |
4e4ca161 | 2563 | } |
16fcdacc CB |
2564 | |
2565 | return 0; | |
4e4ca161 SH |
2566 | } |
2567 | ||
4d5b72a1 | 2568 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2569 | const char *path, |
2570 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2571 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2572 | { |
7a76eeaa | 2573 | __do_free char *p1 = NULL; |
3b7e332f | 2574 | int ret; |
7a76eeaa | 2575 | char *p2; |
911324ef | 2576 | |
eed95eb0 | 2577 | if (strnequal(mntent->mnt_type, "overlay", 7)) { |
749f98d9 | 2578 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2579 | if (ret < 0) |
2580 | return -1; | |
2581 | } | |
6e46cc0d | 2582 | |
34cfffb3 | 2583 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 | 2584 | ret = mkdir_p(path, 0755); |
55022530 CB |
2585 | if (ret < 0 && errno != EEXIST) |
2586 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
34cfffb3 SG |
2587 | } |
2588 | ||
0fd73091 CB |
2589 | if (!hasmntopt(mntent, "create=file")) |
2590 | return 0; | |
749f98d9 | 2591 | |
0fd73091 CB |
2592 | ret = access(path, F_OK); |
2593 | if (ret == 0) | |
2594 | return 0; | |
749f98d9 | 2595 | |
0fd73091 CB |
2596 | p1 = strdup(path); |
2597 | if (!p1) | |
2598 | return -1; | |
749f98d9 | 2599 | |
0fd73091 | 2600 | p2 = dirname(p1); |
749f98d9 | 2601 | |
0fd73091 | 2602 | ret = mkdir_p(p2, 0755); |
55022530 CB |
2603 | if (ret < 0 && errno != EEXIST) |
2604 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
749f98d9 | 2605 | |
3b7e332f CB |
2606 | ret = mknod(path, S_IFREG | 0000, 0); |
2607 | if (ret < 0 && errno != EEXIST) | |
2608 | return -errno; | |
0fd73091 | 2609 | |
749f98d9 | 2610 | return 0; |
4d5b72a1 NC |
2611 | } |
2612 | ||
ec50007f CB |
2613 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2614 | * without a rootfs. */ | |
db4aba38 | 2615 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2616 | const char *path, |
2617 | const struct lxc_rootfs *rootfs, | |
2618 | const char *lxc_name, | |
2619 | const char *lxc_path) | |
4d5b72a1 | 2620 | { |
fd214f37 | 2621 | __do_free char *mntdata = NULL; |
a08bfbe3 CB |
2622 | unsigned long mntflags = 0, pflags = 0; |
2623 | char *rootfs_path = NULL; | |
d8b712bc | 2624 | int ret; |
181437fd | 2625 | bool dev, optional, relative; |
0b932f9d | 2626 | struct lxc_mount_options opts = {}; |
d8b712bc CB |
2627 | |
2628 | optional = hasmntopt(mntent, "optional") != NULL; | |
2629 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2630 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2631 | |
ec50007f CB |
2632 | if (rootfs && rootfs->path) |
2633 | rootfs_path = rootfs->mount; | |
2634 | ||
d8b712bc CB |
2635 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2636 | lxc_path); | |
2637 | if (ret < 0) { | |
2638 | if (optional) | |
2639 | return 0; | |
608e3567 | 2640 | |
d8b712bc CB |
2641 | return -1; |
2642 | } | |
16fcdacc | 2643 | |
1b82d721 | 2644 | ret = parse_lxc_mount_attrs(&opts, mntent->mnt_opts); |
16fcdacc CB |
2645 | if (ret < 0) |
2646 | return ret; | |
4e4ca161 | 2647 | |
1b82d721 CB |
2648 | /* |
2649 | * Idmapped mount entries will be setup by the parent for us. Note that | |
2650 | * we rely on mount_entry_create_dir_file() above to have already | |
2651 | * created the target path for us. So the parent can just open the | |
2652 | * target and send us the target fd. | |
2653 | */ | |
2654 | errno = EOPNOTSUPP; | |
fa8e75f0 | 2655 | if (!is_empty_string(opts.userns_path)) |
1b82d721 | 2656 | return systrace_ret(0, "Skipping idmapped mount entry"); |
fa8e75f0 | 2657 | |
d840039e YT |
2658 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2659 | if (ret < 0) | |
2660 | return -1; | |
2661 | ||
d94eb390 | 2662 | ret = parse_mntopts_legacy(mntent->mnt_opts, &mntflags, &mntdata); |
d8b712bc | 2663 | if (ret < 0) |
a08bfbe3 | 2664 | return ret; |
a17b1e65 | 2665 | |
6e46cc0d | 2666 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2667 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2668 | |
911324ef DL |
2669 | return ret; |
2670 | } | |
2671 | ||
8183f09e CB |
2672 | static inline int mount_entry_on_systemfs(struct lxc_rootfs *rootfs, |
2673 | struct mntent *mntent) | |
db4aba38 | 2674 | { |
1433c9f9 CB |
2675 | int ret; |
2676 | ||
2677 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2678 | * absolute paths starting at / on the host. |
2679 | */ | |
1433c9f9 | 2680 | if (mntent->mnt_dir[0] != '/') |
9bcde680 | 2681 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/%s", mntent->mnt_dir); |
1433c9f9 | 2682 | else |
9bcde680 CB |
2683 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s", mntent->mnt_dir); |
2684 | if (ret < 0) | |
1433c9f9 | 2685 | return -1; |
1433c9f9 | 2686 | |
8183f09e | 2687 | return mount_entry_on_generic(mntent, rootfs->buf, NULL, NULL, NULL); |
db4aba38 NC |
2688 | } |
2689 | ||
4e4ca161 | 2690 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
9c0fd29a | 2691 | struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2692 | const char *lxc_name, |
2693 | const char *lxc_path) | |
911324ef | 2694 | { |
bdd2b34c | 2695 | int offset; |
013bd428 | 2696 | char *aux; |
67e571de | 2697 | const char *lxcpath; |
bdd2b34c | 2698 | int ret = 0; |
0ad19a3f | 2699 | |
593e8478 | 2700 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2701 | if (!lxcpath) |
2a59a681 | 2702 | return -1; |
2a59a681 | 2703 | |
bdd2b34c CB |
2704 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2705 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2706 | */ | |
9bcde680 CB |
2707 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s/rootfs", lxcpath, lxc_name); |
2708 | if (ret < 0) | |
80a881b2 SH |
2709 | goto skipvarlib; |
2710 | ||
9c0fd29a | 2711 | aux = strstr(mntent->mnt_dir, rootfs->buf); |
80a881b2 | 2712 | if (aux) { |
9c0fd29a | 2713 | offset = strlen(rootfs->buf); |
80a881b2 SH |
2714 | goto skipabs; |
2715 | } | |
2716 | ||
2717 | skipvarlib: | |
013bd428 | 2718 | aux = strstr(mntent->mnt_dir, rootfs->path); |
55022530 CB |
2719 | if (!aux) |
2720 | return log_warn(ret, "Ignoring mount point \"%s\"", mntent->mnt_dir); | |
80a881b2 SH |
2721 | offset = strlen(rootfs->path); |
2722 | ||
2723 | skipabs: | |
9bcde680 CB |
2724 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s", rootfs->mount, aux + offset); |
2725 | if (ret < 0) | |
a17b1e65 | 2726 | return -1; |
a17b1e65 | 2727 | |
9c0fd29a | 2728 | return mount_entry_on_generic(mntent, rootfs->buf, rootfs, lxc_name, lxc_path); |
911324ef | 2729 | } |
d330fe7b | 2730 | |
4e4ca161 | 2731 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
4806d3b9 | 2732 | struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2733 | const char *lxc_name, |
2734 | const char *lxc_path) | |
911324ef | 2735 | { |
911324ef | 2736 | int ret; |
d330fe7b | 2737 | |
34cfffb3 | 2738 | /* relative to root mount point */ |
9bcde680 CB |
2739 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s", rootfs->mount, mntent->mnt_dir); |
2740 | if (ret < 0) | |
9ba8130c | 2741 | return -1; |
911324ef | 2742 | |
4806d3b9 | 2743 | return mount_entry_on_generic(mntent, rootfs->buf, rootfs, lxc_name, lxc_path); |
911324ef DL |
2744 | } |
2745 | ||
8183f09e | 2746 | static int mount_file_entries(struct lxc_rootfs *rootfs, FILE *file, |
1ae3c19f | 2747 | const char *lxc_name, const char *lxc_path) |
911324ef | 2748 | { |
9d03d857 | 2749 | char buf[PATH_MAX]; |
0fd73091 | 2750 | struct mntent mntent; |
e76b8764 | 2751 | |
aaf901be | 2752 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2753 | int ret; |
2754 | ||
1ae3c19f | 2755 | if (!rootfs->path) |
8183f09e | 2756 | ret = mount_entry_on_systemfs(rootfs, &mntent); |
1ae3c19f CB |
2757 | else if (mntent.mnt_dir[0] != '/') |
2758 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2759 | lxc_name, lxc_path); | |
2760 | else | |
2761 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2762 | lxc_name, lxc_path); |
1ae3c19f CB |
2763 | if (ret < 0) |
2764 | return -1; | |
0ad19a3f | 2765 | } |
cd54d859 | 2766 | |
55022530 CB |
2767 | if (!feof(file) || ferror(file)) |
2768 | return log_error(-1, "Failed to parse mount entries"); | |
9d03d857 CB |
2769 | |
2770 | return 0; | |
e7938e9e MN |
2771 | } |
2772 | ||
55022530 CB |
2773 | static inline void __auto_endmntent__(FILE **f) |
2774 | { | |
2775 | if (*f) | |
2776 | endmntent(*f); | |
2777 | } | |
2778 | ||
2779 | #define __do_endmntent __attribute__((__cleanup__(__auto_endmntent__))) | |
2780 | ||
48e5dcc8 | 2781 | static int setup_mount_fstab(struct lxc_rootfs *rootfs, const char *fstab, |
8183f09e | 2782 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2783 | { |
55022530 | 2784 | __do_endmntent FILE *f = NULL; |
e7938e9e MN |
2785 | int ret; |
2786 | ||
2787 | if (!fstab) | |
2788 | return 0; | |
2789 | ||
55022530 CB |
2790 | f = setmntent(fstab, "re"); |
2791 | if (!f) | |
2792 | return log_error_errno(-1, errno, "Failed to open \"%s\"", fstab); | |
e7938e9e | 2793 | |
a7c6e830 | 2794 | ret = mount_file_entries(rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2795 | if (ret < 0) |
2796 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2797 | |
0ad19a3f | 2798 | return ret; |
2799 | } | |
2800 | ||
1800f924 WB |
2801 | /* |
2802 | * In order for nested containers to be able to mount /proc and /sys they need | |
2803 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2804 | * (like lxcfs). | |
2805 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2806 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2807 | * container's root user can mount them anyway and thus has access to the two | |
2808 | * file systems. But a non-root user in the container should not be allowed to | |
2809 | * access them as a side effect without explicitly allowing it. | |
2810 | */ | |
2811 | static const char nesting_helpers[] = | |
dc691e34 CB |
2812 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2813 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 WB |
2814 | |
2815 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2816 | bool include_nesting_helpers) | |
e7938e9e | 2817 | { |
f62cf1d4 | 2818 | __do_close int fd = -EBADF; |
4110345b | 2819 | FILE *f; |
5ef5c9a3 | 2820 | int ret; |
e7938e9e | 2821 | char *mount_entry; |
5ef5c9a3 | 2822 | struct lxc_list *iterator; |
5ef5c9a3 | 2823 | |
0fd73091 | 2824 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2825 | if (fd < 0) { |
a324e7eb CB |
2826 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2827 | ||
5ef5c9a3 CB |
2828 | if (errno != ENOSYS) |
2829 | return NULL; | |
a324e7eb CB |
2830 | |
2831 | fd = lxc_make_tmpfile(template, true); | |
55022530 CB |
2832 | if (fd < 0) |
2833 | return log_error_errno(NULL, errno, "Could not create temporary mount file"); | |
0fd73091 | 2834 | |
6bd04140 | 2835 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2836 | } |
e7938e9e | 2837 | |
0fd73091 CB |
2838 | lxc_list_for_each (iterator, mount) { |
2839 | size_t len; | |
2840 | ||
e7938e9e | 2841 | mount_entry = iterator->elem; |
0fd73091 | 2842 | len = strlen(mount_entry); |
5ef5c9a3 | 2843 | |
489f39be | 2844 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 | 2845 | if (ret != len) |
79bcf5ee | 2846 | return NULL; |
0fd73091 | 2847 | |
489f39be | 2848 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 | 2849 | if (ret != 1) |
79bcf5ee | 2850 | return NULL; |
e7938e9e MN |
2851 | } |
2852 | ||
1800f924 WB |
2853 | if (include_nesting_helpers) { |
2854 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2855 | STRARRAYLEN(nesting_helpers)); |
2856 | if (ret != STRARRAYLEN(nesting_helpers)) | |
79bcf5ee | 2857 | return NULL; |
1800f924 WB |
2858 | } |
2859 | ||
0fd73091 CB |
2860 | ret = lseek(fd, 0, SEEK_SET); |
2861 | if (ret < 0) | |
79bcf5ee | 2862 | return NULL; |
0fd73091 | 2863 | |
4110345b CB |
2864 | f = fdopen(fd, "re+"); |
2865 | if (f) | |
2866 | move_fd(fd); /* Transfer ownership of fd. */ | |
2867 | return f; | |
9fc7f8c0 TA |
2868 | } |
2869 | ||
06749971 | 2870 | static int setup_mount_entries(const struct lxc_conf *conf, |
48e5dcc8 CB |
2871 | struct lxc_rootfs *rootfs, struct lxc_list *mount, |
2872 | const char *lxc_name, const char *lxc_path) | |
9fc7f8c0 | 2873 | { |
c85ced65 | 2874 | __do_fclose FILE *f = NULL; |
9fc7f8c0 | 2875 | |
1800f924 | 2876 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2877 | if (!f) |
9fc7f8c0 | 2878 | return -1; |
e7938e9e | 2879 | |
a7c6e830 | 2880 | return mount_file_entries(rootfs, f, lxc_name, lxc_path); |
e7938e9e MN |
2881 | } |
2882 | ||
1b82d721 CB |
2883 | static int __lxc_idmapped_mounts_child(struct lxc_handler *handler, FILE *f) |
2884 | { | |
2885 | struct lxc_conf *conf = handler->conf; | |
2886 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
5a782dca | 2887 | int mnt_seq = 0; |
1b82d721 CB |
2888 | int ret; |
2889 | char buf[PATH_MAX]; | |
2890 | struct mntent mntent; | |
2891 | ||
2892 | while (getmntent_r(f, &mntent, buf, sizeof(buf))) { | |
2893 | __do_close int fd_from = -EBADF, fd_to = -EBADF, | |
2894 | fd_userns = -EBADF; | |
2895 | __do_free char *__data = NULL; | |
5a782dca | 2896 | int cur_mnt_seq = -1; |
1b82d721 CB |
2897 | struct lxc_mount_options opts = {}; |
2898 | int dfd_from; | |
2899 | const char *source_relative, *target_relative; | |
6b48a575 | 2900 | struct lxc_mount_attr attr = {}; |
1b82d721 CB |
2901 | |
2902 | ret = parse_lxc_mount_attrs(&opts, mntent.mnt_opts); | |
2903 | if (ret < 0) | |
2904 | return syserror("Failed to parse LXC specific mount options"); | |
2905 | __data = opts.data; | |
2906 | ||
2907 | ret = parse_mount_attrs(&opts, mntent.mnt_opts); | |
2908 | if (ret < 0) | |
2909 | return syserror("Failed to parse mount options"); | |
2910 | ||
2911 | /* No idmapped mount entry so skip it. */ | |
2912 | if (is_empty_string(opts.userns_path)) | |
2913 | continue; | |
2914 | ||
2915 | if (!can_use_bind_mounts()) | |
2916 | return syserror_set(-EINVAL, "Kernel does not support idmapped mounts"); | |
2917 | ||
2918 | if (!opts.bind) | |
2919 | return syserror_set(-EINVAL, "Only bind mounts can currently be idmapped"); | |
2920 | ||
2921 | /* We don't support new filesystem mounts yet. */ | |
2922 | if (!is_empty_string(mntent.mnt_type) && | |
2923 | !strequal(mntent.mnt_type, "none")) | |
2924 | return syserror_set(-EINVAL, "Only bind mounts can currently be idmapped"); | |
2925 | ||
2926 | /* Someone specified additional mount options for a bind-mount. */ | |
2927 | if (!is_empty_string(opts.data)) | |
2928 | return syserror_set(-EINVAL, "Bind mounts don't support non-generic mount options"); | |
2929 | ||
2930 | /* | |
2931 | * The source path is supposed to be taken relative to the | |
2932 | * container's rootfs mount or - if the container does not have | |
2933 | * a separate rootfs - to the host's /. | |
2934 | */ | |
2935 | source_relative = deabs(mntent.mnt_fsname); | |
2936 | if (opts.relative || !rootfs->path) | |
2937 | dfd_from = rootfs->dfd_mnt; | |
2938 | else | |
2939 | dfd_from = rootfs->dfd_host; | |
2940 | fd_from = open_tree(dfd_from, source_relative, | |
2941 | OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC | | |
3eb23230 | 2942 | (opts.bind_recursively ? AT_RECURSIVE : 0)); |
1b82d721 CB |
2943 | if (fd_from < 0) |
2944 | return syserror("Failed to create detached %smount of %d/%s", | |
3eb23230 | 2945 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2946 | dfd_from, source_relative); |
2947 | ||
2948 | if (strequal(opts.userns_path, "container")) | |
2949 | fd_userns = openat(dfd_from, "proc/self/ns/user", O_RDONLY | O_CLOEXEC); | |
2950 | else | |
2951 | fd_userns = open_at(-EBADF, opts.userns_path, | |
2952 | PROTECT_OPEN_WITH_TRAILING_SYMLINKS, 0, 0); | |
2953 | if (fd_userns < 0) { | |
2954 | if (opts.optional) { | |
2955 | TRACE("Skipping optional idmapped mount"); | |
2956 | continue; | |
2957 | } | |
2958 | ||
2959 | return syserror("Failed to open user namespace \"%s\" for detached %smount of %d/%s", | |
3eb23230 | 2960 | opts.userns_path, opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2961 | dfd_from, source_relative); |
2962 | } | |
2963 | ||
2964 | ret = __lxc_abstract_unix_send_two_fds(handler->data_sock[0], | |
2965 | fd_from, fd_userns, | |
2966 | &opts, sizeof(opts)); | |
2967 | if (ret <= 0) { | |
2968 | if (opts.optional) { | |
2969 | TRACE("Skipping optional idmapped mount"); | |
2970 | continue; | |
2971 | } | |
2972 | ||
2973 | return syserror("Failed to send file descriptor %d for detached %smount of %d/%s and file descriptor %d of user namespace \"%s\" to parent", | |
3eb23230 | 2974 | fd_from, opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2975 | dfd_from, source_relative, fd_userns, |
2976 | opts.userns_path); | |
2977 | } | |
2978 | ||
5a782dca CB |
2979 | ret = lxc_abstract_unix_rcv_credential(handler->data_sock[0], |
2980 | &cur_mnt_seq, | |
2981 | sizeof(cur_mnt_seq)); | |
1b82d721 CB |
2982 | if (ret <= 0) { |
2983 | if (opts.optional) { | |
2984 | TRACE("Skipping optional idmapped mount"); | |
2985 | continue; | |
2986 | } | |
2987 | ||
2988 | return syserror("Failed to receive notification that parent idmapped detached %smount %d/%s to user namespace %d", | |
3eb23230 | 2989 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2990 | dfd_from, source_relative, fd_userns); |
2991 | } | |
2992 | ||
5a782dca CB |
2993 | if (mnt_seq != cur_mnt_seq) |
2994 | return syserror("Expected mount sequence number and mount sequence number from parent mismatch: %d != %d", | |
2995 | mnt_seq, cur_mnt_seq); | |
2996 | mnt_seq++; | |
2997 | ||
6b48a575 CB |
2998 | /* Set regular mount options. */ |
2999 | attr = opts.attr; | |
3000 | attr.propagation = 0; | |
3001 | ret = mount_setattr(fd_from, | |
3002 | "", | |
3003 | AT_EMPTY_PATH | | |
3eb23230 | 3004 | (opts.bind_recursively ? AT_RECURSIVE : 0), |
6b48a575 CB |
3005 | &attr, |
3006 | sizeof(attr)); | |
1b82d721 CB |
3007 | if (ret < 0) { |
3008 | if (opts.optional) { | |
3009 | TRACE("Skipping optional idmapped mount"); | |
3010 | continue; | |
3011 | } | |
3012 | ||
6b48a575 | 3013 | return syserror("Failed to set %smount options on detached %d/%s", |
3eb23230 | 3014 | opts.bind_recursively ? "recursive " : "", |
6b48a575 CB |
3015 | dfd_from, source_relative); |
3016 | } | |
3017 | ||
3018 | /* Set propagation mount options. */ | |
3019 | if (opts.attr.propagation) { | |
3020 | attr = (struct lxc_mount_attr) { | |
3021 | attr.propagation = opts.attr.propagation, | |
3022 | }; | |
3023 | ||
3024 | ret = mount_setattr(fd_from, | |
3025 | "", | |
3026 | AT_EMPTY_PATH | | |
3027 | (opts.propagate_recursively ? AT_RECURSIVE : 0), | |
3028 | &attr, | |
3029 | sizeof(attr)); | |
3030 | if (ret < 0) { | |
3031 | if (opts.optional) { | |
3032 | TRACE("Skipping optional idmapped mount"); | |
3033 | continue; | |
3034 | } | |
3035 | ||
3036 | return syserror("Failed to set %spropagation mount options on detached %d/%s", | |
3037 | opts.bind_recursively ? "recursive " : "", | |
3038 | dfd_from, source_relative); | |
3039 | } | |
1b82d721 CB |
3040 | } |
3041 | ||
6b48a575 | 3042 | |
1b82d721 CB |
3043 | /* |
3044 | * In contrast to the legacy mount codepath we will simplify | |
3045 | * our lifes and just always treat the target mountpoint to be | |
3046 | * relative to the container's rootfs mountpoint or - if the | |
3047 | * container does not have a separate rootfs - to the host's /. | |
3048 | */ | |
3049 | ||
3050 | target_relative = deabs(mntent.mnt_dir); | |
3051 | if (rootfs->path) | |
3052 | dfd_from = rootfs->dfd_mnt; | |
3053 | else | |
3054 | dfd_from = rootfs->dfd_host; | |
3055 | fd_to = open_at(dfd_from, target_relative, PROTECT_OPATH_FILE, PROTECT_LOOKUP_BENEATH_WITH_SYMLINKS, 0); | |
3056 | if (fd_to < 0) { | |
3057 | if (opts.optional) { | |
3058 | TRACE("Skipping optional idmapped mount"); | |
3059 | continue; | |
3060 | } | |
3061 | ||
3062 | return syserror("Failed to open target mountpoint %d/%s for detached idmapped %smount %d:%d/%s", | |
3063 | dfd_from, target_relative, | |
3eb23230 | 3064 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
3065 | fd_userns, dfd_from, source_relative); |
3066 | } | |
3067 | ||
3068 | ret = move_detached_mount(fd_from, fd_to, "", 0, 0); | |
3069 | if (ret) { | |
3070 | if (opts.optional) { | |
3071 | TRACE("Skipping optional idmapped mount"); | |
3072 | continue; | |
3073 | } | |
3074 | ||
3075 | return syserror("Failed to attach detached idmapped %smount %d:%d/%s to target mountpoint %d/%s", | |
3eb23230 | 3076 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
3077 | fd_userns, dfd_from, source_relative, dfd_from, target_relative); |
3078 | } | |
3079 | ||
3080 | TRACE("Attached detached idmapped %smount %d:%d/%s to target mountpoint %d/%s", | |
3eb23230 | 3081 | opts.bind_recursively ? "recursive " : "", fd_userns, dfd_from, |
1b82d721 CB |
3082 | source_relative, dfd_from, target_relative); |
3083 | } | |
3084 | ||
3085 | if (!feof(f) || ferror(f)) | |
3086 | return syserror_set(-EINVAL, "Failed to parse mount entries"); | |
3087 | ||
3088 | return 0; | |
3089 | } | |
3090 | ||
3091 | static int lxc_idmapped_mounts_child(struct lxc_handler *handler) | |
3092 | { | |
3093 | __do_fclose FILE *f_entries = NULL; | |
3094 | int fret = -1; | |
3095 | struct lxc_conf *conf = handler->conf; | |
3096 | const char *fstab = conf->fstab; | |
3097 | struct lxc_list *mount = &conf->mount_list; | |
3098 | int ret; | |
3099 | ||
3100 | f_entries = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); | |
3101 | if (!f_entries) { | |
3102 | SYSERROR("Failed to create anonymous mount file"); | |
3103 | goto out; | |
3104 | } | |
3105 | ||
3106 | ret = __lxc_idmapped_mounts_child(handler, f_entries); | |
3107 | if (ret) { | |
3108 | SYSERROR("Failed to setup idmapped mount entries"); | |
3109 | goto out; | |
3110 | } | |
3111 | ||
3112 | TRACE("Finished setting up idmapped mounts"); | |
3113 | ||
3114 | if (fstab) { | |
3115 | __do_endmntent FILE *f_fstab = NULL; | |
3116 | ||
3117 | f_fstab = setmntent(fstab, "re"); | |
3118 | if (!f_fstab) { | |
3119 | SYSERROR("Failed to open fstab format file \"%s\"", fstab); | |
3120 | goto out; | |
3121 | } | |
3122 | ||
3123 | ret = __lxc_idmapped_mounts_child(handler, f_fstab); | |
3124 | if (ret) { | |
3125 | SYSERROR("Failed to setup idmapped mount entries specified in fstab"); | |
3126 | goto out; | |
3127 | } | |
3128 | ||
3129 | TRACE("Finished setting up idmapped mounts specified in fstab"); | |
3130 | } | |
3131 | ||
3132 | fret = 0; | |
3133 | ||
3134 | out: | |
3135 | ret = lxc_abstract_unix_send_credential(handler->data_sock[0], NULL, 0); | |
3136 | if (ret < 0) | |
caaa223b | 3137 | return syserror("Failed to inform parent that we are done setting up mounts"); |
1b82d721 CB |
3138 | |
3139 | return fret; | |
3140 | } | |
3141 | ||
bab88e68 CS |
3142 | static int parse_cap(const char *cap) |
3143 | { | |
84760c11 | 3144 | size_t i; |
3145 | int capid = -1; | |
0fd73091 CB |
3146 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
3147 | char *ptr = NULL; | |
bab88e68 | 3148 | |
71528742 | 3149 | if (strequal(cap, "none")) |
7035407c DE |
3150 | return -2; |
3151 | ||
8560cd36 | 3152 | for (i = 0; i < end; i++) { |
71528742 | 3153 | if (!strequal(cap, caps_opt[i].name)) |
bab88e68 CS |
3154 | continue; |
3155 | ||
3156 | capid = caps_opt[i].value; | |
3157 | break; | |
3158 | } | |
3159 | ||
3160 | if (capid < 0) { | |
0fd73091 CB |
3161 | /* Try to see if it's numeric, so the user may specify |
3162 | * capabilities that the running kernel knows about but we | |
3163 | * don't | |
3164 | */ | |
bab88e68 CS |
3165 | errno = 0; |
3166 | capid = strtol(cap, &ptr, 10); | |
3167 | if (!ptr || *ptr != '\0' || errno != 0) | |
3168 | /* not a valid number */ | |
3169 | capid = -1; | |
3170 | else if (capid > lxc_caps_last_cap()) | |
3171 | /* we have a number but it's not a valid | |
3172 | * capability */ | |
3173 | capid = -1; | |
3174 | } | |
3175 | ||
3176 | return capid; | |
3177 | } | |
3178 | ||
0769b82a CS |
3179 | int in_caplist(int cap, struct lxc_list *caps) |
3180 | { | |
0769b82a | 3181 | int capid; |
0fd73091 | 3182 | struct lxc_list *iterator; |
0769b82a | 3183 | |
0fd73091 | 3184 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
3185 | capid = parse_cap(iterator->elem); |
3186 | if (capid == cap) | |
3187 | return 1; | |
3188 | } | |
3189 | ||
3190 | return 0; | |
3191 | } | |
3192 | ||
81810dd1 DL |
3193 | static int setup_caps(struct lxc_list *caps) |
3194 | { | |
bab88e68 | 3195 | int capid; |
0fd73091 CB |
3196 | char *drop_entry; |
3197 | struct lxc_list *iterator; | |
81810dd1 | 3198 | |
0fd73091 CB |
3199 | lxc_list_for_each (iterator, caps) { |
3200 | int ret; | |
81810dd1 DL |
3201 | |
3202 | drop_entry = iterator->elem; | |
3203 | ||
bab88e68 | 3204 | capid = parse_cap(drop_entry); |
55022530 CB |
3205 | if (capid < 0) |
3206 | return log_error(-1, "unknown capability %s", drop_entry); | |
81810dd1 | 3207 | |
b81689a1 CB |
3208 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
3209 | prctl_arg(0), prctl_arg(0)); | |
55022530 CB |
3210 | if (ret < 0) |
3211 | return log_error_errno(-1, errno, "Failed to remove %s capability", drop_entry); | |
0fd73091 | 3212 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
3213 | } |
3214 | ||
0fd73091 | 3215 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
3216 | return 0; |
3217 | } | |
3218 | ||
3219 | static int dropcaps_except(struct lxc_list *caps) | |
3220 | { | |
2f443e88 | 3221 | __do_free int *caplist = NULL; |
0fd73091 | 3222 | int i, capid, numcaps; |
1fb86a7c | 3223 | char *keep_entry; |
0fd73091 | 3224 | struct lxc_list *iterator; |
1fb86a7c | 3225 | |
0fd73091 | 3226 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
3227 | if (numcaps <= 0 || numcaps > 200) |
3228 | return -1; | |
0fd73091 | 3229 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 3230 | |
1a0e70ac | 3231 | /* caplist[i] is 1 if we keep capability i */ |
2f443e88 | 3232 | caplist = must_realloc(NULL, numcaps * sizeof(int)); |
1fb86a7c SH |
3233 | memset(caplist, 0, numcaps * sizeof(int)); |
3234 | ||
0fd73091 | 3235 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
3236 | keep_entry = iterator->elem; |
3237 | ||
bab88e68 | 3238 | capid = parse_cap(keep_entry); |
7035407c DE |
3239 | if (capid == -2) |
3240 | continue; | |
3241 | ||
55022530 CB |
3242 | if (capid < 0) |
3243 | return log_error(-1, "Unknown capability %s", keep_entry); | |
1fb86a7c | 3244 | |
0fd73091 | 3245 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
3246 | caplist[capid] = 1; |
3247 | } | |
0fd73091 CB |
3248 | |
3249 | for (i = 0; i < numcaps; i++) { | |
3250 | int ret; | |
3251 | ||
1fb86a7c SH |
3252 | if (caplist[i]) |
3253 | continue; | |
0fd73091 | 3254 | |
b81689a1 CB |
3255 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
3256 | prctl_arg(0), prctl_arg(0)); | |
55022530 CB |
3257 | if (ret < 0) |
3258 | return log_error_errno(-1, errno, "Failed to remove capability %d", i); | |
1fb86a7c SH |
3259 | } |
3260 | ||
0fd73091 | 3261 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
3262 | return 0; |
3263 | } | |
3264 | ||
0fd73091 CB |
3265 | static int parse_resource(const char *res) |
3266 | { | |
3267 | int ret; | |
c6d09e15 WB |
3268 | size_t i; |
3269 | int resid = -1; | |
3270 | ||
0fd73091 | 3271 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
71528742 | 3272 | if (strequal(res, limit_opt[i].name)) |
c6d09e15 | 3273 | return limit_opt[i].value; |
c6d09e15 | 3274 | |
0fd73091 | 3275 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 3276 | * resources that the running kernel knows about but |
0fd73091 CB |
3277 | * we don't. |
3278 | */ | |
3279 | ret = lxc_safe_int(res, &resid); | |
3280 | if (ret < 0) | |
3281 | return -1; | |
3282 | ||
3283 | return resid; | |
c6d09e15 WB |
3284 | } |
3285 | ||
223797c3 | 3286 | int setup_resource_limits(struct lxc_conf *conf, pid_t pid) |
0fd73091 CB |
3287 | { |
3288 | int resid; | |
c6d09e15 | 3289 | struct lxc_limit *lim; |
c6d09e15 | 3290 | |
223797c3 CB |
3291 | if (list_empty(&conf->limits)) |
3292 | return 0; | |
c6d09e15 | 3293 | |
223797c3 | 3294 | list_for_each_entry(lim, &conf->limits, head) { |
c6d09e15 | 3295 | resid = parse_resource(lim->resource); |
55022530 CB |
3296 | if (resid < 0) |
3297 | return log_error(-1, "Unknown resource %s", lim->resource); | |
c6d09e15 | 3298 | |
f48b5fd8 | 3299 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
55022530 CB |
3300 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) |
3301 | return log_error_errno(-1, errno, "Failed to set limit %s", lim->resource); | |
2de12765 CB |
3302 | |
3303 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 3304 | #else |
55022530 | 3305 | return log_error(-1, "Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 | 3306 | #endif |
c6d09e15 | 3307 | } |
0fd73091 | 3308 | |
223797c3 | 3309 | TRACE("Setup resource limits"); |
c6d09e15 WB |
3310 | return 0; |
3311 | } | |
3312 | ||
ba9f9347 | 3313 | int setup_sysctl_parameters(struct lxc_conf *conf) |
7edd0540 | 3314 | { |
e6f76452 | 3315 | __do_free char *tmp = NULL; |
0fd73091 | 3316 | int ret = 0; |
6b5a54cd | 3317 | char filename[PATH_MAX] = {0}; |
ba9f9347 | 3318 | struct lxc_sysctl *sysctl, *nsysctl; |
7edd0540 | 3319 | |
ba9f9347 CB |
3320 | if (!list_empty(&conf->sysctls)) |
3321 | return 0; | |
3322 | ||
3323 | list_for_each_entry_safe(sysctl, nsysctl, &conf->sysctls, head) { | |
3324 | tmp = lxc_string_replace(".", "/", sysctl->key); | |
55022530 | 3325 | if (!tmp) |
ba9f9347 | 3326 | return log_error(-1, "Failed to replace key %s", sysctl->key); |
7edd0540 | 3327 | |
9bcde680 CB |
3328 | ret = strnprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); |
3329 | if (ret < 0) | |
55022530 | 3330 | return log_error(-1, "Error setting up sysctl parameters path"); |
7edd0540 | 3331 | |
ba9f9347 CB |
3332 | ret = lxc_write_to_file(filename, sysctl->value, |
3333 | strlen(sysctl->value), false, 0666); | |
55022530 CB |
3334 | if (ret < 0) |
3335 | return log_error_errno(-1, errno, "Failed to setup sysctl parameters %s to %s", | |
ba9f9347 | 3336 | sysctl->key, sysctl->value); |
7edd0540 | 3337 | } |
0fd73091 | 3338 | |
7edd0540 L |
3339 | return 0; |
3340 | } | |
3341 | ||
91d04bf9 | 3342 | int setup_proc_filesystem(struct lxc_conf *conf, pid_t pid) |
61d7a733 | 3343 | { |
0c669152 | 3344 | __do_free char *tmp = NULL; |
0fd73091 | 3345 | int ret = 0; |
6b5a54cd | 3346 | char filename[PATH_MAX] = {0}; |
91d04bf9 CB |
3347 | struct lxc_proc *proc; |
3348 | ||
3349 | if (!list_empty(&conf->procs)) | |
3350 | return 0; | |
61d7a733 | 3351 | |
91d04bf9 CB |
3352 | list_for_each_entry(proc, &conf->procs, head) { |
3353 | tmp = lxc_string_replace(".", "/", proc->filename); | |
55022530 | 3354 | if (!tmp) |
91d04bf9 | 3355 | return log_error(-1, "Failed to replace key %s", proc->filename); |
61d7a733 | 3356 | |
9bcde680 CB |
3357 | ret = strnprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); |
3358 | if (ret < 0) | |
55022530 | 3359 | return log_error(-1, "Error setting up proc filesystem path"); |
61d7a733 | 3360 | |
91d04bf9 CB |
3361 | ret = lxc_write_to_file(filename, proc->value, |
3362 | strlen(proc->value), false, 0666); | |
55022530 | 3363 | if (ret < 0) |
91d04bf9 CB |
3364 | return log_error_errno(-1, errno, "Failed to setup proc filesystem %s to %s", |
3365 | proc->filename, proc->value); | |
61d7a733 | 3366 | } |
0fd73091 | 3367 | |
91d04bf9 | 3368 | TRACE("Setup /proc/%d settings", pid); |
61d7a733 YT |
3369 | return 0; |
3370 | } | |
3371 | ||
ae9242c8 SH |
3372 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
3373 | ||
7b379ab3 | 3374 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 3375 | { |
26ddeedd | 3376 | int i; |
0fd73091 | 3377 | struct lxc_conf *new; |
7b379ab3 | 3378 | |
b8e43ef0 | 3379 | new = zalloc(sizeof(*new)); |
0fd73091 | 3380 | if (!new) |
7b379ab3 | 3381 | return NULL; |
7b379ab3 | 3382 | |
4b73005c | 3383 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
9c601e1f | 3384 | new->personality = LXC_ARCH_UNCHANGED; |
124fa0a8 | 3385 | new->autodev = 1; |
3a784510 | 3386 | new->console.buffer_size = 0; |
596a818d DE |
3387 | new->console.log_path = NULL; |
3388 | new->console.log_fd = -1; | |
861813e5 | 3389 | new->console.log_size = 0; |
28a4b0e5 | 3390 | new->console.path = NULL; |
63376d7d | 3391 | new->console.peer = -1; |
fb87aa6a | 3392 | new->console.proxy.busy = -1; |
36a94ce8 | 3393 | new->console.proxy.ptx = -1; |
41808e20 | 3394 | new->console.proxy.pty = -1; |
f3dff080 CB |
3395 | new->console.ptx = -EBADF; |
3396 | new->console.pty = -EBADF; | |
d926c261 | 3397 | new->console.pty_nr = -1; |
63376d7d | 3398 | new->console.name[0] = '\0'; |
7294a26d | 3399 | new->devpts_fd = -EBADF; |
732375f5 | 3400 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 3401 | new->maincmd_fd = -1; |
258f8051 | 3402 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 3403 | new->nbd_idx = -1; |
54c30e29 | 3404 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 3405 | if (!new->rootfs.mount) { |
53f3f048 SH |
3406 | free(new); |
3407 | return NULL; | |
3408 | } | |
6e54330c | 3409 | new->rootfs.managed = true; |
ea57e424 | 3410 | new->rootfs.dfd_mnt = -EBADF; |
a5a08920 | 3411 | new->rootfs.dfd_dev = -EBADF; |
ea11a215 | 3412 | new->rootfs.dfd_host = -EBADF; |
79ff643d | 3413 | new->rootfs.fd_path_pin = -EBADF; |
4b875ef9 | 3414 | new->rootfs.dfd_idmapped = -EBADF; |
858377e4 | 3415 | new->logfd = -1; |
c9dbb8ed CB |
3416 | INIT_LIST_HEAD(&new->cgroup); |
3417 | INIT_LIST_HEAD(&new->cgroup2); | |
a134099d CB |
3418 | /* Block ("allowlist") all devices by default. */ |
3419 | new->bpf_devices.list_type = LXC_BPF_DEVICE_CGROUP_ALLOWLIST; | |
93de768e | 3420 | INIT_LIST_HEAD(&(new->bpf_devices).devices); |
7b379ab3 | 3421 | lxc_list_init(&new->mount_list); |
81810dd1 | 3422 | lxc_list_init(&new->caps); |
1fb86a7c | 3423 | lxc_list_init(&new->keepcaps); |
0589d744 | 3424 | INIT_LIST_HEAD(&new->id_map); |
46ad64ab CB |
3425 | new->root_nsuid_map = NULL; |
3426 | new->root_nsgid_map = NULL; | |
f979ac15 | 3427 | lxc_list_init(&new->includes); |
4184c3e1 | 3428 | lxc_list_init(&new->aliens); |
7c661726 | 3429 | lxc_list_init(&new->environment); |
223797c3 | 3430 | INIT_LIST_HEAD(&new->limits); |
ba9f9347 | 3431 | INIT_LIST_HEAD(&new->sysctls); |
91d04bf9 | 3432 | INIT_LIST_HEAD(&new->procs); |
44ae0fb6 | 3433 | new->hooks_version = 0; |
28d9e29e | 3434 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 3435 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 3436 | lxc_list_init(&new->groups); |
d2e75eba | 3437 | INIT_LIST_HEAD(&new->state_clients); |
fe4de9a6 | 3438 | new->lsm_aa_profile = NULL; |
1800f924 | 3439 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 3440 | new->lsm_se_context = NULL; |
4fef78bc | 3441 | new->lsm_se_keyring_context = NULL; |
8f818a84 | 3442 | new->keyring_disable_session = false; |
952b5031 | 3443 | new->transient_procfs_mnt = false; |
7a41e857 LT |
3444 | new->shmount.path_host = NULL; |
3445 | new->shmount.path_cont = NULL; | |
7b379ab3 | 3446 | |
72bb04e4 PT |
3447 | /* if running in a new user namespace, init and COMMAND |
3448 | * default to running as UID/GID 0 when using lxc-execute */ | |
3449 | new->init_uid = 0; | |
3450 | new->init_gid = 0; | |
c71f64cb | 3451 | memset(&new->init_groups, 0, sizeof(lxc_groups_t)); |
43654d34 | 3452 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 3453 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
70fd7fc9 | 3454 | memset(&new->timens, 0, sizeof(struct timens_offsets)); |
c3e3c21a | 3455 | seccomp_conf_init(new); |
72bb04e4 | 3456 | |
87d0990c CB |
3457 | INIT_LIST_HEAD(&new->netdevs); |
3458 | ||
7b379ab3 | 3459 | return new; |
089cd8b8 DL |
3460 | } |
3461 | ||
344c9d81 | 3462 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 3463 | size_t buf_size) |
f6d3e3e4 | 3464 | { |
f62cf1d4 | 3465 | __do_close int fd = -EBADF; |
76bcd422 | 3466 | int ret; |
6b5a54cd | 3467 | char path[PATH_MAX]; |
f6d3e3e4 | 3468 | |
a19b974f | 3469 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
f62cf1d4 | 3470 | __do_close int setgroups_fd = -EBADF; |
a19b974f | 3471 | |
9bcde680 CB |
3472 | ret = strnprintf(path, sizeof(path), "/proc/%d/setgroups", pid); |
3473 | if (ret < 0) | |
a19b974f | 3474 | return -E2BIG; |
a19b974f | 3475 | |
76bcd422 | 3476 | setgroups_fd = open(path, O_WRONLY); |
55022530 CB |
3477 | if (setgroups_fd < 0 && errno != ENOENT) |
3478 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
a19b974f | 3479 | |
76bcd422 CB |
3480 | if (setgroups_fd >= 0) { |
3481 | ret = lxc_write_nointr(setgroups_fd, "deny\n", | |
3482 | STRLITERALLEN("deny\n")); | |
55022530 CB |
3483 | if (ret != STRLITERALLEN("deny\n")) |
3484 | return log_error_errno(-1, errno, "Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
395b1a3e | 3485 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 3486 | } |
a19b974f CB |
3487 | } |
3488 | ||
9bcde680 | 3489 | ret = strnprintf(path, sizeof(path), "/proc/%d/%cid_map", pid, |
29053180 | 3490 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
9bcde680 | 3491 | if (ret < 0) |
f6d3e3e4 | 3492 | return -E2BIG; |
29053180 | 3493 | |
55022530 CB |
3494 | fd = open(path, O_WRONLY | O_CLOEXEC); |
3495 | if (fd < 0) | |
3496 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
29053180 | 3497 | |
29053180 | 3498 | ret = lxc_write_nointr(fd, buf, buf_size); |
55022530 CB |
3499 | if (ret != buf_size) |
3500 | return log_error_errno(-1, errno, "Failed to write %cid mapping to \"%s\"", | |
3501 | idtype == ID_TYPE_UID ? 'u' : 'g', path); | |
29053180 CB |
3502 | |
3503 | return 0; | |
f6d3e3e4 SH |
3504 | } |
3505 | ||
6e50e704 CB |
3506 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
3507 | * | |
3508 | * @return 1 if functional binary was found | |
3509 | * @return 0 if binary exists but is lacking privilege | |
3510 | * @return -ENOENT if binary does not exist | |
3511 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 3512 | */ |
df6a2945 CB |
3513 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
3514 | { | |
48411df2 | 3515 | __do_free char *path = NULL; |
df6a2945 CB |
3516 | int ret; |
3517 | struct stat st; | |
df6a2945 | 3518 | |
6e50e704 | 3519 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
83cb7362 | 3520 | return ret_errno(EINVAL); |
6e50e704 | 3521 | |
df6a2945 CB |
3522 | path = on_path(binary, NULL); |
3523 | if (!path) | |
83cb7362 | 3524 | return ret_errno(ENOENT); |
df6a2945 CB |
3525 | |
3526 | ret = stat(path, &st); | |
3275932b | 3527 | if (ret < 0) |
83cb7362 | 3528 | return -errno; |
df6a2945 CB |
3529 | |
3530 | /* Check if the binary is setuid. */ | |
55022530 CB |
3531 | if (st.st_mode & S_ISUID) |
3532 | return log_debug(1, "The binary \"%s\" does have the setuid bit set", path); | |
df6a2945 | 3533 | |
0fd73091 | 3534 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
3535 | /* Check if it has the CAP_SETUID capability. */ |
3536 | if ((cap & CAP_SETUID) && | |
3537 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
55022530 CB |
3538 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) |
3539 | return log_debug(1, "The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
df6a2945 CB |
3540 | |
3541 | /* Check if it has the CAP_SETGID capability. */ | |
3542 | if ((cap & CAP_SETGID) && | |
3543 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
55022530 CB |
3544 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) |
3545 | return log_debug(1, "The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
a864a2e1 CB |
3546 | |
3547 | return 0; | |
0fd73091 | 3548 | #else |
83cb7362 CB |
3549 | /* |
3550 | * If we cannot check for file capabilities we need to give the benefit | |
69924fff CB |
3551 | * of the doubt. Otherwise we might fail even though all the necessary |
3552 | * file capabilities are set. | |
3553 | */ | |
55022530 | 3554 | DEBUG("Cannot check for file capabilities as full capability support is missing. Manual intervention needed"); |
3275932b | 3555 | return 1; |
a864a2e1 | 3556 | #endif |
df6a2945 CB |
3557 | } |
3558 | ||
59eac805 | 3559 | static int lxc_map_ids_exec_wrapper(void *args) |
986ef930 CB |
3560 | { |
3561 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
3562 | return -1; | |
3563 | } | |
3564 | ||
0589d744 | 3565 | static struct id_map *find_mapped_hostid_entry(const struct list_head *idmap, |
86c78011 CB |
3566 | unsigned id, enum idtype idtype); |
3567 | ||
0589d744 | 3568 | int lxc_map_ids(struct list_head *idmap, pid_t pid) |
f6d3e3e4 | 3569 | { |
0589d744 | 3570 | int hostuid, hostgid, fill, left; |
986ef930 | 3571 | char u_or_g; |
4bc3b759 | 3572 | char *pos; |
6b5a54cd | 3573 | char cmd_output[PATH_MAX]; |
0fd73091 | 3574 | struct id_map *map; |
0fd73091 | 3575 | enum idtype type; |
0fd73091 | 3576 | int ret = 0, gidmap = 0, uidmap = 0; |
c6ba8981 CB |
3577 | char mapbuf[STRLITERALLEN("new@idmap") + STRLITERALLEN(" ") + |
3578 | INTTYPE_TO_STRLEN(pid_t) + STRLITERALLEN(" ") + | |
3579 | LXC_IDMAPLEN] = {0}; | |
86c78011 | 3580 | bool had_entry = false, maps_host_root = false, use_shadow = false; |
c724025c JC |
3581 | |
3582 | hostuid = geteuid(); | |
3583 | hostgid = getegid(); | |
df6a2945 | 3584 | |
86c78011 CB |
3585 | /* |
3586 | * Check whether caller wants to map host root. | |
3587 | * Due to a security fix newer kernels require CAP_SETFCAP when mapping | |
3588 | * host root into the child userns as you would be able to write fscaps | |
3589 | * that would be valid in the ancestor userns. Mapping host root should | |
3590 | * rarely be the case but LXC is being clever in a bunch of cases. | |
3591 | */ | |
3592 | if (find_mapped_hostid_entry(idmap, 0, ID_TYPE_UID)) | |
3593 | maps_host_root = true; | |
3594 | ||
df6a2945 CB |
3595 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid |
3596 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
3597 | * will protected it by preventing another user from being handed the |
3598 | * range by shadow. | |
3599 | */ | |
df6a2945 | 3600 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
3601 | if (uidmap == -ENOENT) |
3602 | WARN("newuidmap binary is missing"); | |
3603 | else if (!uidmap) | |
3604 | WARN("newuidmap is lacking necessary privileges"); | |
3605 | ||
df6a2945 | 3606 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
3607 | if (gidmap == -ENOENT) |
3608 | WARN("newgidmap binary is missing"); | |
3609 | else if (!gidmap) | |
3610 | WARN("newgidmap is lacking necessary privileges"); | |
3611 | ||
86c78011 CB |
3612 | if (maps_host_root) { |
3613 | INFO("Caller maps host root. Writing mapping directly"); | |
3614 | } else if (uidmap > 0 && gidmap > 0) { | |
0fd73091 | 3615 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 3616 | use_shadow = true; |
df6a2945 | 3617 | } else { |
99d43365 CB |
3618 | /* In case unprivileged users run application containers via |
3619 | * execute() or a start*() there are valid cases where they may | |
3620 | * only want to map their own {g,u}id. Let's not block them from | |
3621 | * doing so by requiring geteuid() == 0. | |
3622 | */ | |
3623 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
3624 | "write directly with euid %d", hostuid); |
3625 | } | |
3626 | ||
3627 | /* Check if we really need to use newuidmap and newgidmap. | |
f48e8071 | 3628 | * If the user is only remapping their own {g,u}id, we don't need it. |
c724025c | 3629 | */ |
0589d744 | 3630 | if (use_shadow && list_len(idmap) == 2) { |
c724025c | 3631 | use_shadow = false; |
0589d744 | 3632 | list_for_each_entry(map, idmap, head) { |
c724025c JC |
3633 | if (map->idtype == ID_TYPE_UID && map->range == 1 && |
3634 | map->nsid == hostuid && map->hostid == hostuid) | |
3635 | continue; | |
3636 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
3637 | map->nsid == hostgid && map->hostid == hostgid) | |
3638 | continue; | |
3639 | use_shadow = true; | |
3640 | break; | |
3641 | } | |
0e6e3a41 | 3642 | } |
251d0d2a | 3643 | |
986ef930 CB |
3644 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3645 | type++, u_or_g = 'g') { | |
3646 | pos = mapbuf; | |
3647 | ||
0e6e3a41 | 3648 | if (use_shadow) |
986ef930 | 3649 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3650 | |
0589d744 | 3651 | list_for_each_entry(map, idmap, head) { |
cf3ef16d SH |
3652 | if (map->idtype != type) |
3653 | continue; | |
3654 | ||
4bc3b759 CB |
3655 | had_entry = true; |
3656 | ||
986ef930 | 3657 | left = LXC_IDMAPLEN - (pos - mapbuf); |
9bcde680 | 3658 | fill = strnprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3659 | use_shadow ? " " : "", map->nsid, |
3660 | map->hostid, map->range, | |
0e6e3a41 | 3661 | use_shadow ? "" : "\n"); |
55022530 CB |
3662 | /* |
3663 | * The kernel only takes <= 4k for writes to | |
3664 | * /proc/<pid>/{g,u}id_map | |
3665 | */ | |
9bcde680 | 3666 | if (fill <= 0) |
55022530 | 3667 | return log_error_errno(-1, errno, "Too many %cid mappings defined", u_or_g); |
4bc3b759 | 3668 | |
cf3ef16d | 3669 | pos += fill; |
251d0d2a | 3670 | } |
cf3ef16d | 3671 | if (!had_entry) |
4f7521b4 | 3672 | continue; |
cf3ef16d | 3673 | |
d85813cd | 3674 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
3675 | * easier. |
3676 | */ | |
3677 | if (use_shadow) { | |
3678 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3679 | lxc_map_ids_exec_wrapper, | |
3680 | (void *)mapbuf); | |
55022530 CB |
3681 | if (ret < 0) |
3682 | return log_error(-1, "new%cidmap failed to write mapping \"%s\": %s", u_or_g, cmd_output, mapbuf); | |
54fbbeb5 | 3683 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3684 | } else { |
986ef930 | 3685 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
55022530 CB |
3686 | if (ret < 0) |
3687 | return log_error(-1, "Failed to write mapping: %s", mapbuf); | |
54fbbeb5 | 3688 | TRACE("Wrote mapping \"%s\"", mapbuf); |
d1838f34 | 3689 | } |
986ef930 CB |
3690 | |
3691 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3692 | } |
251d0d2a | 3693 | |
986ef930 | 3694 | return 0; |
f6d3e3e4 SH |
3695 | } |
3696 | ||
234998b4 CB |
3697 | /* |
3698 | * Return the host uid/gid to which the container root is mapped in val. | |
0b3a6504 | 3699 | * Return true if id was found, false otherwise. |
cf3ef16d | 3700 | */ |
234998b4 | 3701 | static id_t get_mapped_rootid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3702 | { |
4160c3a0 | 3703 | unsigned nsid; |
0fd73091 | 3704 | struct id_map *map; |
4160c3a0 CB |
3705 | |
3706 | if (idtype == ID_TYPE_UID) | |
3707 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3708 | else | |
3709 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3710 | |
0589d744 | 3711 | list_for_each_entry (map, &conf->id_map, head) { |
7b50c609 | 3712 | if (map->idtype != idtype) |
cf3ef16d | 3713 | continue; |
4160c3a0 | 3714 | if (map->nsid != nsid) |
cf3ef16d | 3715 | continue; |
234998b4 | 3716 | return map->hostid; |
cf3ef16d | 3717 | } |
4160c3a0 | 3718 | |
234998b4 CB |
3719 | if (idtype == ID_TYPE_UID) |
3720 | return LXC_INVALID_UID; | |
3721 | ||
3722 | return LXC_INVALID_GID; | |
cf3ef16d SH |
3723 | } |
3724 | ||
facdf925 | 3725 | int mapped_hostid(unsigned id, const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3726 | { |
cf3ef16d | 3727 | struct id_map *map; |
0fd73091 | 3728 | |
0589d744 | 3729 | list_for_each_entry(map, &conf->id_map, head) { |
2133f58c | 3730 | if (map->idtype != idtype) |
cf3ef16d | 3731 | continue; |
0fd73091 | 3732 | |
cf3ef16d | 3733 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3734 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3735 | } |
0fd73091 | 3736 | |
57d116ab | 3737 | return -1; |
cf3ef16d SH |
3738 | } |
3739 | ||
7581a82f | 3740 | int find_unmapped_nsid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3741 | { |
cf3ef16d | 3742 | struct id_map *map; |
2133f58c | 3743 | unsigned int freeid = 0; |
0fd73091 | 3744 | |
cf3ef16d | 3745 | again: |
0589d744 | 3746 | list_for_each_entry(map, &conf->id_map, head) { |
2133f58c | 3747 | if (map->idtype != idtype) |
cf3ef16d | 3748 | continue; |
0fd73091 | 3749 | |
cf3ef16d SH |
3750 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3751 | freeid = map->nsid + map->range; | |
3752 | goto again; | |
3753 | } | |
3754 | } | |
0fd73091 | 3755 | |
cf3ef16d SH |
3756 | return freeid; |
3757 | } | |
3758 | ||
e1b9d6af CB |
3759 | /* |
3760 | * Mount a proc under @rootfs if proc self points to a pid other than | |
3761 | * my own. This is needed to have a known-good proc mount for setting | |
3762 | * up LSMs both at container startup and attach. | |
3763 | * | |
e1b9d6af CB |
3764 | * NOTE: not to be called from inside the container namespace! |
3765 | */ | |
952b5031 | 3766 | static int lxc_transient_proc(struct lxc_rootfs *rootfs) |
e1b9d6af | 3767 | { |
952b5031 CB |
3768 | __do_close int fd_proc = -EBADF; |
3769 | int link_to_pid, link_len, pid_self, ret; | |
3770 | char link[INTTYPE_TO_STRLEN(pid_t) + 1]; | |
e1b9d6af | 3771 | |
ea57e424 | 3772 | link_len = readlinkat(rootfs->dfd_mnt, "proc/self", link, sizeof(link)); |
952b5031 | 3773 | if (link_len < 0) { |
ea57e424 | 3774 | ret = mkdirat(rootfs->dfd_mnt, "proc", 0000); |
952b5031 | 3775 | if (ret < 0 && errno != EEXIST) |
ea57e424 | 3776 | return log_error_errno(-errno, errno, "Failed to create %d(proc)", rootfs->dfd_mnt); |
e1b9d6af | 3777 | |
952b5031 CB |
3778 | goto domount; |
3779 | } else if (link_len >= sizeof(link)) { | |
3780 | return log_error_errno(-EIO, EIO, "Truncated link target"); | |
e1b9d6af | 3781 | } |
952b5031 | 3782 | link[link_len] = '\0'; |
e1b9d6af | 3783 | |
952b5031 CB |
3784 | pid_self = lxc_raw_getpid(); |
3785 | INFO("Caller's PID is %d; /proc/self points to %s", pid_self, link); | |
e1b9d6af | 3786 | |
952b5031 CB |
3787 | ret = lxc_safe_int(link, &link_to_pid); |
3788 | if (ret) | |
3789 | return log_error_errno(-ret, ret, "Failed to parse %s", link); | |
e1b9d6af | 3790 | |
952b5031 CB |
3791 | /* Correct procfs is already mounted. */ |
3792 | if (link_to_pid == pid_self) | |
3793 | return log_trace(0, "Correct procfs instance mounted"); | |
e1b9d6af | 3794 | |
ea57e424 | 3795 | fd_proc = open_at(rootfs->dfd_mnt, "proc", PROTECT_OPATH_DIRECTORY, |
952b5031 CB |
3796 | PROTECT_LOOKUP_BENEATH_XDEV, 0); |
3797 | if (fd_proc < 0) | |
3798 | return log_error_errno(-errno, errno, "Failed to open transient procfs mountpoint"); | |
e1b9d6af | 3799 | |
9bcde680 CB |
3800 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/proc/self/fd/%d", fd_proc); |
3801 | if (ret < 0) | |
952b5031 | 3802 | return ret_errno(EIO); |
e1b9d6af | 3803 | |
952b5031 | 3804 | ret = umount2(rootfs->buf, MNT_DETACH); |
e1b9d6af | 3805 | if (ret < 0) |
952b5031 | 3806 | SYSWARN("Failed to umount \"%s\" with MNT_DETACH", rootfs->buf); |
e1b9d6af CB |
3807 | |
3808 | domount: | |
3809 | /* rootfs is NULL */ | |
952b5031 CB |
3810 | if (!rootfs->path) { |
3811 | ret = mount("proc", rootfs->buf, "proc", 0, NULL); | |
3812 | } else { | |
ea57e424 | 3813 | ret = safe_mount_beneath_at(rootfs->dfd_mnt, "none", "proc", "proc", 0, NULL); |
952b5031 | 3814 | if (ret < 0) { |
9bcde680 CB |
3815 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/proc", rootfs->path ? rootfs->mount : ""); |
3816 | if (ret < 0) | |
952b5031 CB |
3817 | return ret_errno(EIO); |
3818 | ||
3819 | ret = safe_mount("proc", rootfs->buf, "proc", 0, NULL, rootfs->mount); | |
3820 | } | |
3821 | } | |
e1b9d6af | 3822 | if (ret < 0) |
952b5031 | 3823 | return log_error_errno(-1, errno, "Failed to mount temporary procfs"); |
e1b9d6af | 3824 | |
952b5031 | 3825 | INFO("Created transient procfs mount"); |
e1b9d6af CB |
3826 | return 1; |
3827 | } | |
3828 | ||
943144d9 | 3829 | /* NOTE: Must not be called from inside the container namespace! */ |
59eac805 | 3830 | static int lxc_create_tmp_proc_mount(struct lxc_conf *conf) |
5112cd70 SH |
3831 | { |
3832 | int mounted; | |
3833 | ||
952b5031 | 3834 | mounted = lxc_transient_proc(&conf->rootfs); |
5112cd70 | 3835 | if (mounted == -1) { |
01958b1f | 3836 | /* continue only if there is no rootfs */ |
943144d9 | 3837 | if (conf->rootfs.path) |
952b5031 | 3838 | return log_error_errno(-EPERM, EPERM, "Failed to create transient procfs mount"); |
5112cd70 | 3839 | } else if (mounted == 1) { |
952b5031 | 3840 | conf->transient_procfs_mnt = true; |
5112cd70 | 3841 | } |
943144d9 | 3842 | |
5112cd70 SH |
3843 | return 0; |
3844 | } | |
3845 | ||
3846 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3847 | { | |
952b5031 CB |
3848 | if (lxc_conf->transient_procfs_mnt) { |
3849 | (void)umount2("/proc", MNT_DETACH); | |
3850 | lxc_conf->transient_procfs_mnt = false; | |
3851 | } | |
5112cd70 SH |
3852 | } |
3853 | ||
9e61fb1f | 3854 | /* Walk /proc/mounts and change any shared entries to dependent mounts. */ |
ed41e764 | 3855 | static void turn_into_dependent_mounts(const struct lxc_rootfs *rootfs) |
e995d7a2 | 3856 | { |
7969675f | 3857 | __do_free char *line = NULL; |
003be47b | 3858 | __do_fclose FILE *f = NULL; |
f62cf1d4 | 3859 | __do_close int memfd = -EBADF, mntinfo_fd = -EBADF; |
e995d7a2 | 3860 | size_t len = 0; |
a39fc34b CB |
3861 | ssize_t copied; |
3862 | int ret; | |
e995d7a2 | 3863 | |
ed41e764 CB |
3864 | mntinfo_fd = open_at(rootfs->dfd_host, "proc/self/mountinfo", PROTECT_OPEN, |
3865 | (PROTECT_LOOKUP_BENEATH_XDEV & ~RESOLVE_NO_SYMLINKS), 0); | |
fea3b91d | 3866 | if (mntinfo_fd < 0) { |
ed41e764 | 3867 | SYSERROR("Failed to open %d/proc/self/mountinfo", rootfs->dfd_host); |
6a49f05e | 3868 | return; |
fea3b91d | 3869 | } |
6a49f05e CB |
3870 | |
3871 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3872 | if (memfd < 0) { | |
3873 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3874 | ||
3875 | if (errno != ENOSYS) { | |
fea3b91d | 3876 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e CB |
3877 | return; |
3878 | } | |
3879 | ||
3880 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d | 3881 | if (memfd < 0) { |
fea3b91d DJ |
3882 | WARN("Failed to create temporary file"); |
3883 | return; | |
3884 | } | |
6a49f05e CB |
3885 | } |
3886 | ||
a39fc34b | 3887 | copied = fd_to_fd(mntinfo_fd, memfd); |
6a49f05e | 3888 | if (copied < 0) { |
fea3b91d | 3889 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3890 | return; |
3891 | } | |
6a49f05e | 3892 | |
6a49f05e CB |
3893 | ret = lseek(memfd, 0, SEEK_SET); |
3894 | if (ret < 0) { | |
fea3b91d | 3895 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e CB |
3896 | return; |
3897 | } | |
3898 | ||
4110345b | 3899 | f = fdopen(memfd, "re"); |
e995d7a2 | 3900 | if (!f) { |
003be47b | 3901 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark all shared. Continuing"); |
e995d7a2 SH |
3902 | return; |
3903 | } | |
3904 | ||
003be47b CB |
3905 | /* |
3906 | * After a successful fdopen() memfd will be closed when calling | |
3907 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3908 | */ | |
3909 | move_fd(memfd); | |
3910 | ||
e995d7a2 | 3911 | while (getline(&line, &len, f) != -1) { |
0fd73091 CB |
3912 | char *opts, *target; |
3913 | ||
e995d7a2 SH |
3914 | target = get_field(line, 4); |
3915 | if (!target) | |
3916 | continue; | |
0fd73091 | 3917 | |
e995d7a2 SH |
3918 | opts = get_field(target, 2); |
3919 | if (!opts) | |
3920 | continue; | |
0fd73091 | 3921 | |
e995d7a2 SH |
3922 | null_endofword(opts); |
3923 | if (!strstr(opts, "shared")) | |
3924 | continue; | |
0fd73091 | 3925 | |
e995d7a2 | 3926 | null_endofword(target); |
0fd73091 CB |
3927 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3928 | if (ret < 0) { | |
9e61fb1f | 3929 | SYSERROR("Failed to recursively turn old root mount tree into dependent mount. Continuing..."); |
6a49f05e | 3930 | continue; |
e995d7a2 SH |
3931 | } |
3932 | } | |
9e61fb1f | 3933 | TRACE("Turned all mount table entries into dependent mount"); |
e995d7a2 SH |
3934 | } |
3935 | ||
0fd73091 CB |
3936 | /* This does the work of remounting / if it is shared, calling the container |
3937 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3938 | */ |
8ce1abc2 CB |
3939 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3940 | const char *lxcpath) | |
0ad19a3f | 3941 | { |
0fd73091 CB |
3942 | int ret; |
3943 | ||
ea11a215 CB |
3944 | conf->rootfs.dfd_host = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
3945 | if (conf->rootfs.dfd_host < 0) | |
a370f16b CB |
3946 | return log_error_errno(-errno, errno, "Failed to open \"/\""); |
3947 | ||
ed41e764 CB |
3948 | turn_into_dependent_mounts(&conf->rootfs); |
3949 | ||
35120d9c | 3950 | if (conf->rootfs_setup) { |
35120d9c | 3951 | const char *path = conf->rootfs.mount; |
0fd73091 | 3952 | |
ed41e764 CB |
3953 | /* |
3954 | * The rootfs was set up in another namespace. bind-mount it to | |
0fd73091 CB |
3955 | * give us a mount in our own ns so we can pivot_root to it |
3956 | */ | |
3957 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
55022530 CB |
3958 | if (ret < 0) |
3959 | return log_error(-1, "Failed to bind mount container / onto itself"); | |
0fd73091 | 3960 | |
ea57e424 CB |
3961 | conf->rootfs.dfd_mnt = openat(-EBADF, path, O_RDONLY | O_CLOEXEC | O_DIRECTORY | O_PATH | O_NOCTTY); |
3962 | if (conf->rootfs.dfd_mnt < 0) | |
26ea5533 CB |
3963 | return log_error_errno(-errno, errno, "Failed to open file descriptor for container rootfs"); |
3964 | ||
55022530 | 3965 | return log_trace(0, "Bind mounted container / onto itself"); |
35120d9c | 3966 | } |
d4ef7c50 | 3967 | |
0fd73091 | 3968 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
55022530 CB |
3969 | if (ret < 0) |
3970 | return log_error(-1, "Failed to run pre-mount hooks"); | |
35120d9c | 3971 | |
4e86cad3 | 3972 | ret = lxc_mount_rootfs(&conf->rootfs); |
55022530 CB |
3973 | if (ret < 0) |
3974 | return log_error(-1, "Failed to setup rootfs for"); | |
35120d9c SH |
3975 | |
3976 | conf->rootfs_setup = true; | |
3977 | return 0; | |
3978 | } | |
3979 | ||
1c1c7051 SH |
3980 | static bool verify_start_hooks(struct lxc_conf *conf) |
3981 | { | |
6b5a54cd | 3982 | char path[PATH_MAX]; |
0fd73091 CB |
3983 | struct lxc_list *it; |
3984 | ||
3985 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3986 | int ret; |
0fd73091 | 3987 | char *hookname = it->elem; |
1c1c7051 | 3988 | |
9bcde680 | 3989 | ret = strnprintf(path, sizeof(path), "%s%s", |
0fd73091 CB |
3990 | conf->rootfs.path ? conf->rootfs.mount : "", |
3991 | hookname); | |
9bcde680 | 3992 | if (ret < 0) |
1c1c7051 | 3993 | return false; |
0fd73091 | 3994 | |
75193660 | 3995 | ret = access(path, X_OK); |
55022530 CB |
3996 | if (ret < 0) |
3997 | return log_error_errno(false, errno, "Start hook \"%s\" not found in container", hookname); | |
0fd73091 | 3998 | |
6a0c909a | 3999 | return true; |
1c1c7051 SH |
4000 | } |
4001 | ||
4002 | return true; | |
4003 | } | |
4004 | ||
20502652 CB |
4005 | static int lxc_setup_boot_id(void) |
4006 | { | |
4007 | int ret; | |
4008 | const char *boot_id_path = "/proc/sys/kernel/random/boot_id"; | |
4009 | const char *mock_boot_id_path = "/dev/.lxc-boot-id"; | |
4010 | lxc_id128_t n; | |
4011 | ||
4012 | if (access(boot_id_path, F_OK)) | |
4013 | return 0; | |
4014 | ||
4015 | memset(&n, 0, sizeof(n)); | |
4016 | if (lxc_id128_randomize(&n)) { | |
4017 | SYSERROR("Failed to generate random data for uuid"); | |
4018 | return -1; | |
4019 | } | |
4020 | ||
4021 | ret = lxc_id128_write(mock_boot_id_path, n); | |
4022 | if (ret < 0) { | |
4023 | SYSERROR("Failed to write uuid to %s", mock_boot_id_path); | |
4024 | return -1; | |
4025 | } | |
4026 | ||
4027 | ret = chmod(mock_boot_id_path, 0444); | |
4028 | if (ret < 0) { | |
4029 | SYSERROR("Failed to chown %s", mock_boot_id_path); | |
4030 | (void)unlink(mock_boot_id_path); | |
4031 | return -1; | |
4032 | } | |
4033 | ||
4034 | ret = mount(mock_boot_id_path, boot_id_path, NULL, MS_BIND, NULL); | |
4035 | if (ret < 0) { | |
4036 | SYSERROR("Failed to mount %s to %s", mock_boot_id_path, | |
4037 | boot_id_path); | |
4038 | (void)unlink(mock_boot_id_path); | |
4039 | return -1; | |
4040 | } | |
4041 | ||
4042 | ret = mount(NULL, boot_id_path, NULL, | |
4043 | (MS_BIND | MS_REMOUNT | MS_RDONLY | MS_NOSUID | MS_NOEXEC | | |
4044 | MS_NODEV), | |
4045 | NULL); | |
4046 | if (ret < 0) { | |
4047 | SYSERROR("Failed to remount %s read-only", boot_id_path); | |
4048 | (void)unlink(mock_boot_id_path); | |
4049 | return -1; | |
4050 | } | |
4051 | ||
4052 | return 0; | |
4053 | } | |
4054 | ||
af04d847 | 4055 | static int lxc_setup_keyring(struct lsm_ops *lsm_ops, const struct lxc_conf *conf) |
d701d729 CB |
4056 | { |
4057 | key_serial_t keyring; | |
4058 | int ret = 0; | |
4059 | ||
4060 | if (conf->lsm_se_keyring_context) | |
af04d847 | 4061 | ret = lsm_ops->keyring_label_set(lsm_ops, conf->lsm_se_keyring_context); |
d701d729 | 4062 | else if (conf->lsm_se_context) |
af04d847 | 4063 | ret = lsm_ops->keyring_label_set(lsm_ops, conf->lsm_se_context); |
d701d729 | 4064 | if (ret < 0) |
d2022f30 | 4065 | return syserror("Failed to set keyring context"); |
d701d729 CB |
4066 | |
4067 | /* | |
4068 | * Try to allocate a new session keyring for the container to prevent | |
4069 | * information leaks. | |
4070 | */ | |
4071 | keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, prctl_arg(0), | |
4072 | prctl_arg(0), prctl_arg(0), prctl_arg(0)); | |
4073 | if (keyring < 0) { | |
4074 | switch (errno) { | |
4075 | case ENOSYS: | |
4076 | DEBUG("The keyctl() syscall is not supported or blocked"); | |
4077 | break; | |
4078 | case EACCES: | |
4079 | __fallthrough; | |
4080 | case EPERM: | |
4081 | DEBUG("Failed to access kernel keyring. Continuing..."); | |
4082 | break; | |
4083 | default: | |
d2022f30 | 4084 | SYSWARN("Failed to create kernel keyring"); |
d701d729 CB |
4085 | break; |
4086 | } | |
4087 | } | |
4088 | ||
4089 | return ret; | |
4090 | } | |
4091 | ||
4b875ef9 CB |
4092 | static int lxc_rootfs_prepare_child(struct lxc_handler *handler) |
4093 | { | |
4094 | struct lxc_rootfs *rootfs = &handler->conf->rootfs; | |
4095 | int dfd_idmapped = -EBADF; | |
4096 | int ret; | |
4097 | ||
0589d744 | 4098 | if (list_empty(&handler->conf->id_map)) |
4b875ef9 CB |
4099 | return 0; |
4100 | ||
4101 | if (is_empty_string(rootfs->mnt_opts.userns_path)) | |
4102 | return 0; | |
4103 | ||
4104 | if (handler->conf->rootfs_setup) | |
4105 | return 0; | |
4106 | ||
4107 | ret = lxc_abstract_unix_recv_one_fd(handler->data_sock[1], &dfd_idmapped, NULL, 0); | |
4108 | if (ret < 0) | |
4109 | return syserror("Failed to receive idmapped mount fd"); | |
4110 | ||
4111 | rootfs->dfd_idmapped = dfd_idmapped; | |
4112 | TRACE("Received detached idmapped mount %d", rootfs->dfd_idmapped); | |
4113 | return 0; | |
4114 | } | |
4115 | ||
1b82d721 CB |
4116 | int lxc_idmapped_mounts_parent(struct lxc_handler *handler) |
4117 | { | |
5a782dca CB |
4118 | int mnt_seq = 0; |
4119 | ||
1b82d721 CB |
4120 | for (;;) { |
4121 | __do_close int fd_from = -EBADF, fd_userns = -EBADF; | |
4122 | struct lxc_mount_attr attr = {}; | |
4123 | struct lxc_mount_options opts = {}; | |
4124 | ssize_t ret; | |
4125 | ||
4126 | ret = __lxc_abstract_unix_recv_two_fds(handler->data_sock[1], | |
4127 | &fd_from, &fd_userns, | |
4128 | &opts, sizeof(opts)); | |
4129 | if (ret < 0) | |
4130 | return syserror("Failed to receive idmapped mount file descriptors from child"); | |
4131 | ||
4132 | if (fd_from < 0 || fd_userns < 0) | |
4133 | return log_trace(0, "Finished receiving idmapped mount file descriptors from child"); | |
4134 | ||
4135 | attr.attr_set = MOUNT_ATTR_IDMAP; | |
4136 | attr.userns_fd = fd_userns; | |
4137 | ret = mount_setattr(fd_from, "", | |
4138 | AT_EMPTY_PATH | | |
3eb23230 | 4139 | (opts.bind_recursively ? AT_RECURSIVE : 0), |
1b82d721 CB |
4140 | &attr, sizeof(attr)); |
4141 | if (ret) | |
4142 | return syserror("Failed to idmap detached %smount %d to %d", | |
3eb23230 | 4143 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
4144 | fd_from, fd_userns); |
4145 | ||
5a782dca CB |
4146 | ret = lxc_abstract_unix_send_credential(handler->data_sock[1], |
4147 | &mnt_seq, | |
4148 | sizeof(mnt_seq)); | |
1b82d721 CB |
4149 | if (ret < 0) |
4150 | return syserror("Parent failed to notify child that detached %smount %d was idmapped to user namespace %d", | |
3eb23230 | 4151 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
4152 | fd_from, fd_userns); |
4153 | ||
4154 | TRACE("Parent idmapped detached %smount %d to user namespace %d", | |
3eb23230 | 4155 | opts.bind_recursively ? "recursive " : "", fd_from, fd_userns); |
5a782dca | 4156 | mnt_seq++; |
1b82d721 CB |
4157 | } |
4158 | } | |
4159 | ||
493ae3fe CB |
4160 | static int lxc_recv_ttys_from_child(struct lxc_handler *handler) |
4161 | { | |
b35f8f7e | 4162 | call_cleaner(lxc_delete_tty) struct lxc_tty_info *info_new = &(struct lxc_tty_info){}; |
493ae3fe CB |
4163 | int sock = handler->data_sock[1]; |
4164 | struct lxc_conf *conf = handler->conf; | |
b35f8f7e CB |
4165 | struct lxc_tty_info *tty_info = &conf->ttys; |
4166 | size_t ttys_max = tty_info->max; | |
4167 | struct lxc_terminal_info *terminal_info; | |
4168 | int ret; | |
493ae3fe | 4169 | |
b35f8f7e | 4170 | if (!ttys_max) |
493ae3fe CB |
4171 | return 0; |
4172 | ||
b35f8f7e CB |
4173 | info_new->tty = malloc(sizeof(*(info_new->tty)) * ttys_max); |
4174 | if (!info_new->tty) | |
4175 | return ret_errno(ENOMEM); | |
493ae3fe | 4176 | |
b35f8f7e CB |
4177 | for (int i = 0; i < ttys_max; i++) { |
4178 | terminal_info = &info_new->tty[i]; | |
4179 | terminal_info->busy = -1; | |
4180 | terminal_info->ptx = -EBADF; | |
4181 | terminal_info->pty = -EBADF; | |
4182 | } | |
493ae3fe | 4183 | |
b35f8f7e CB |
4184 | for (int i = 0; i < ttys_max; i++) { |
4185 | int ptx = -EBADF, pty = -EBADF; | |
4186 | ||
4187 | ret = lxc_abstract_unix_recv_two_fds(sock, &ptx, &pty); | |
493ae3fe | 4188 | if (ret < 0) |
b35f8f7e | 4189 | return syserror("Failed to receive %zu ttys from child", ttys_max); |
493ae3fe | 4190 | |
b35f8f7e CB |
4191 | terminal_info = &info_new->tty[i]; |
4192 | terminal_info->ptx = ptx; | |
4193 | terminal_info->pty = pty; | |
4194 | TRACE("Received pty with ptx fd %d and pty fd %d from child", | |
4195 | terminal_info->ptx, terminal_info->pty); | |
493ae3fe CB |
4196 | } |
4197 | ||
b35f8f7e CB |
4198 | tty_info->tty = move_ptr(info_new->tty); |
4199 | TRACE("Received %zu ttys from child", ttys_max); | |
4200 | return 0; | |
493ae3fe CB |
4201 | } |
4202 | ||
9f77617b CB |
4203 | static int lxc_send_console_to_parent(struct lxc_handler *handler) |
4204 | { | |
4205 | struct lxc_terminal *console = &handler->conf->console; | |
4206 | int ret; | |
4207 | ||
4208 | if (!wants_console(console)) | |
4209 | return 0; | |
4210 | ||
4211 | /* We've already allocated a console from the host's devpts instance. */ | |
4212 | if (console->pty < 0) | |
4213 | return 0; | |
4214 | ||
4215 | ret = __lxc_abstract_unix_send_two_fds(handler->data_sock[0], | |
4216 | console->ptx, console->pty, | |
4217 | console, | |
4218 | sizeof(struct lxc_terminal)); | |
4219 | if (ret < 0) | |
4220 | return syserror("Fail to send console to parent"); | |
4221 | ||
4222 | TRACE("Sent console to parent"); | |
4223 | return 0; | |
4224 | } | |
4225 | ||
4226 | static int lxc_recv_console_from_child(struct lxc_handler *handler) | |
4227 | { | |
4228 | __do_close int fd_ptx = -EBADF, fd_pty = -EBADF; | |
4229 | struct lxc_terminal *console = &handler->conf->console; | |
4230 | int ret; | |
4231 | ||
4232 | if (!wants_console(console)) | |
4233 | return 0; | |
4234 | ||
4235 | /* We've already allocated a console from the host's devpts instance. */ | |
4236 | if (console->pty >= 0) | |
4237 | return 0; | |
4238 | ||
4239 | ret = __lxc_abstract_unix_recv_two_fds(handler->data_sock[1], | |
4240 | &fd_ptx, &fd_pty, | |
4241 | console, | |
4242 | sizeof(struct lxc_terminal)); | |
4243 | if (ret < 0) | |
4244 | return syserror("Fail to receive console from child"); | |
4245 | ||
4246 | console->ptx = move_fd(fd_ptx); | |
4247 | console->pty = move_fd(fd_pty); | |
4248 | ||
4249 | TRACE("Received console from child"); | |
4250 | return 0; | |
4251 | } | |
4252 | ||
493ae3fe CB |
4253 | int lxc_sync_fds_parent(struct lxc_handler *handler) |
4254 | { | |
4255 | int ret; | |
4256 | ||
4257 | ret = lxc_seccomp_recv_notifier_fd(&handler->conf->seccomp, handler->data_sock[1]); | |
4258 | if (ret < 0) | |
4259 | return syserror_ret(ret, "Failed to receive seccomp notify fd from child"); | |
4260 | ||
42c0d056 | 4261 | ret = lxc_recv_devpts_from_child(handler); |
493ae3fe CB |
4262 | if (ret < 0) |
4263 | return syserror_ret(ret, "Failed to receive devpts fd from child"); | |
4264 | ||
4265 | /* Read tty fds allocated by child. */ | |
4266 | ret = lxc_recv_ttys_from_child(handler); | |
4267 | if (ret < 0) | |
4268 | return syserror_ret(ret, "Failed to receive tty info from child process"); | |
4269 | ||
4270 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
4271 | ret = lxc_network_recv_name_and_ifindex_from_child(handler); | |
4272 | if (ret < 0) | |
4273 | return syserror_ret(ret, "Failed to receive names and ifindices for network devices from child"); | |
4274 | } | |
4275 | ||
9f77617b CB |
4276 | ret = lxc_recv_console_from_child(handler); |
4277 | if (ret < 0) | |
4278 | return syserror_ret(ret, "Failed to receive console from child"); | |
4279 | ||
493ae3fe CB |
4280 | TRACE("Finished syncing file descriptors with child"); |
4281 | return 0; | |
4282 | } | |
4283 | ||
111ed96e CB |
4284 | int lxc_sync_fds_child(struct lxc_handler *handler) |
4285 | { | |
4286 | int ret; | |
4287 | ||
4288 | ret = lxc_seccomp_send_notifier_fd(&handler->conf->seccomp, handler->data_sock[0]); | |
4289 | if (ret < 0) | |
4290 | return syserror_ret(ret, "Failed to send seccomp notify fd to parent"); | |
4291 | ||
4292 | ret = lxc_send_devpts_to_parent(handler); | |
4293 | if (ret < 0) | |
4294 | return syserror_ret(ret, "Failed to send seccomp devpts fd to parent"); | |
4295 | ||
4296 | ret = lxc_send_ttys_to_parent(handler); | |
4297 | if (ret < 0) | |
4298 | return syserror_ret(ret, "Failed to send tty file descriptors to parent"); | |
4299 | ||
4300 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
4301 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); | |
4302 | if (ret < 0) | |
4303 | return syserror_ret(ret, "Failed to send network device names and ifindices to parent"); | |
4304 | } | |
4305 | ||
9f77617b CB |
4306 | ret = lxc_send_console_to_parent(handler); |
4307 | if (ret < 0) | |
4308 | return syserror_ret(ret, "Failed to send console to parent"); | |
4309 | ||
111ed96e CB |
4310 | TRACE("Finished syncing file descriptors with parent"); |
4311 | return 0; | |
4312 | } | |
4313 | ||
3b988b33 | 4314 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 4315 | { |
2187efd3 | 4316 | int ret; |
0fd73091 | 4317 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 4318 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 4319 | |
4b875ef9 CB |
4320 | ret = lxc_rootfs_prepare_child(handler); |
4321 | if (ret < 0) | |
4322 | return syserror("Failed to prepare rootfs"); | |
4323 | ||
8ce1abc2 | 4324 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
55022530 CB |
4325 | if (ret < 0) |
4326 | return log_error(-1, "Failed to setup rootfs"); | |
35120d9c | 4327 | |
b87ee312 | 4328 | if (handler->nsfd[LXC_NS_UTS] == -EBADF) { |
8353b4c9 | 4329 | ret = setup_utsname(lxc_conf->utsname); |
55022530 CB |
4330 | if (ret < 0) |
4331 | return log_error(-1, "Failed to setup the utsname %s", name); | |
0ad19a3f | 4332 | } |
4333 | ||
8f818a84 | 4334 | if (!lxc_conf->keyring_disable_session) { |
d701d729 | 4335 | ret = lxc_setup_keyring(handler->lsm_ops, lxc_conf); |
8f818a84 | 4336 | if (ret < 0) |
d701d729 | 4337 | return log_error(-1, "Failed to setup container keyring"); |
8f818a84 | 4338 | } |
b25291da | 4339 | |
e389f2af | 4340 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
6bc4165d CB |
4341 | ret = lxc_network_recv_from_parent(handler); |
4342 | if (ret < 0) | |
4343 | return log_error(-1, "Failed to receive veth names from parent"); | |
4344 | ||
87d0990c | 4345 | ret = lxc_setup_network_in_child_namespaces(lxc_conf); |
55022530 CB |
4346 | if (ret < 0) |
4347 | return log_error(-1, "Failed to setup network"); | |
790255cf CB |
4348 | } |
4349 | ||
bc6928ff | 4350 | if (lxc_conf->autodev > 0) { |
63012bdd | 4351 | ret = mount_autodev(name, &lxc_conf->rootfs, lxc_conf->autodevtmpfssize, lxcpath); |
55022530 CB |
4352 | if (ret < 0) |
4353 | return log_error(-1, "Failed to mount \"/dev\""); | |
c6883f38 SH |
4354 | } |
4355 | ||
8353b4c9 CB |
4356 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
4357 | * need to wait until other stuff has finished. | |
368bbc02 | 4358 | */ |
6d25a524 | 4359 | ret = lxc_mount_auto_mounts(handler, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK); |
55022530 CB |
4360 | if (ret < 0) |
4361 | return log_error(-1, "Failed to setup first automatic mounts"); | |
368bbc02 | 4362 | |
48e5dcc8 | 4363 | ret = setup_mount_fstab(&lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
55022530 CB |
4364 | if (ret < 0) |
4365 | return log_error(-1, "Failed to setup mounts"); | |
576f946d | 4366 | |
c631115d FA |
4367 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
4368 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
4369 | &lxc_conf->mount_list, name, lxcpath); | |
55022530 CB |
4370 | if (ret < 0) |
4371 | return log_error(-1, "Failed to setup mount entries"); | |
c631115d FA |
4372 | } |
4373 | ||
1b82d721 CB |
4374 | if (!lxc_sync_wake_parent(handler, START_SYNC_IDMAPPED_MOUNTS)) |
4375 | return -1; | |
4376 | ||
4377 | ret = lxc_idmapped_mounts_child(handler); | |
4378 | if (ret) | |
4379 | return syserror("Failed to attached detached idmapped mounts"); | |
4380 | ||
1f0a3b6e CB |
4381 | lxc_conf->rootfs.dfd_dev = open_at(lxc_conf->rootfs.dfd_mnt, "dev", |
4382 | PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
4383 | if (lxc_conf->rootfs.dfd_dev < 0 && errno != ENOENT) | |
4384 | return log_error_errno(-errno, errno, "Failed to open \"/dev\""); | |
4385 | ||
8353b4c9 CB |
4386 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
4387 | * mounted. It is guaranteed to be mounted now either through | |
4388 | * automatically or via fstab entries. | |
368bbc02 | 4389 | */ |
6d25a524 | 4390 | ret = lxc_mount_auto_mounts(handler, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK); |
55022530 CB |
4391 | if (ret < 0) |
4392 | return log_error(-1, "Failed to setup remaining automatic mounts"); | |
368bbc02 | 4393 | |
8353b4c9 | 4394 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
55022530 CB |
4395 | if (ret < 0) |
4396 | return log_error(-1, "Failed to run mount hooks"); | |
773fb9ca | 4397 | |
bc6928ff | 4398 | if (lxc_conf->autodev > 0) { |
8353b4c9 | 4399 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
55022530 CB |
4400 | if (ret < 0) |
4401 | return log_error(-1, "Failed to run autodev hooks"); | |
06749971 | 4402 | |
8353b4c9 | 4403 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
55022530 CB |
4404 | if (ret < 0) |
4405 | return log_error(-1, "Failed to populate \"/dev\""); | |
91c3830e | 4406 | } |
368bbc02 | 4407 | |
75193660 | 4408 | /* Make sure any start hooks are in the container */ |
55022530 CB |
4409 | if (!verify_start_hooks(lxc_conf)) |
4410 | return log_error(-1, "Failed to verify start hooks"); | |
75193660 | 4411 | |
cf68ffd9 CB |
4412 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
4413 | if (ret < 0) | |
3dd3fc31 | 4414 | return log_error(-1, "Failed to mount transient procfs instance for LSMs"); |
cf68ffd9 | 4415 | |
96a980e1 | 4416 | ret = lxc_setup_devpts_child(handler); |
289b707b CB |
4417 | if (ret < 0) |
4418 | return log_error(-1, "Failed to prepare new devpts instance"); | |
4419 | ||
03585adc CB |
4420 | ret = lxc_finish_devpts_child(handler); |
4421 | if (ret < 0) | |
4422 | return log_error(-1, "Failed to finish devpts setup"); | |
4423 | ||
f3dff080 | 4424 | ret = lxc_setup_console(handler, &lxc_conf->rootfs, &lxc_conf->console, |
37c74fd1 | 4425 | lxc_conf->ttys.dir); |
55022530 CB |
4426 | if (ret < 0) |
4427 | return log_error(-1, "Failed to setup console"); | |
6e590161 | 4428 | |
6a2ca1b4 CB |
4429 | ret = lxc_create_ttys(handler); |
4430 | if (ret < 0) | |
4431 | return log_error(-1, "Failed to create ttys"); | |
4432 | ||
ed8704d0 | 4433 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
55022530 CB |
4434 | if (ret < 0) |
4435 | return log_error(-1, "Failed to setup \"/dev\" symlinks"); | |
69aa6655 | 4436 | |
8ce1abc2 | 4437 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
55022530 CB |
4438 | if (ret < 0) |
4439 | return log_error(-1, "Failed to pivot root into rootfs"); | |
ed502555 | 4440 | |
20502652 CB |
4441 | /* Setting the boot-id is best-effort for now. */ |
4442 | if (lxc_conf->autodev > 0) | |
4443 | (void)lxc_setup_boot_id(); | |
4444 | ||
8353b4c9 | 4445 | ret = setup_personality(lxc_conf->personality); |
55022530 | 4446 | if (ret < 0) |
9c601e1f | 4447 | return syserror("Failed to set personality"); |
cccc74b5 | 4448 | |
8353b4c9 CB |
4449 | /* Set sysctl value to a path under /proc/sys as determined from the |
4450 | * key. For e.g. net.ipv4.ip_forward translated to | |
4451 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 | 4452 | */ |
ba9f9347 CB |
4453 | ret = setup_sysctl_parameters(lxc_conf); |
4454 | if (ret < 0) | |
4455 | return log_error(-1, "Failed to setup sysctl parameters"); | |
7edd0540 | 4456 | |
97a8f74f | 4457 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
55022530 CB |
4458 | if (!lxc_list_empty(&lxc_conf->caps)) |
4459 | return log_error(-1, "Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both"); | |
8353b4c9 | 4460 | |
55022530 CB |
4461 | if (dropcaps_except(&lxc_conf->keepcaps)) |
4462 | return log_error(-1, "Failed to keep capabilities"); | |
97a8f74f | 4463 | } else if (setup_caps(&lxc_conf->caps)) { |
55022530 | 4464 | return log_error(-1, "Failed to drop capabilities"); |
81810dd1 DL |
4465 | } |
4466 | ||
79ff643d | 4467 | put_lxc_rootfs(&handler->conf->rootfs, true); |
8353b4c9 | 4468 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 4469 | |
0ad19a3f | 4470 | return 0; |
4471 | } | |
26ddeedd | 4472 | |
3f60c2f7 | 4473 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 4474 | char *argv[]) |
26ddeedd | 4475 | { |
26ddeedd | 4476 | struct lxc_list *it; |
3ea957c6 RK |
4477 | int which; |
4478 | ||
4479 | for (which = 0; which < NUM_LXC_HOOKS; which ++) { | |
71528742 | 4480 | if (strequal(hookname, lxchook_names[which])) |
3ea957c6 RK |
4481 | break; |
4482 | } | |
4483 | ||
4484 | if (which >= NUM_LXC_HOOKS) | |
26ddeedd | 4485 | return -1; |
3f60c2f7 | 4486 | |
0fd73091 | 4487 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 4488 | int ret; |
3f60c2f7 CB |
4489 | char *hook = it->elem; |
4490 | ||
4491 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 4492 | hookname, argv); |
3f60c2f7 CB |
4493 | if (ret < 0) |
4494 | return -1; | |
26ddeedd | 4495 | } |
3f60c2f7 | 4496 | |
26ddeedd SH |
4497 | return 0; |
4498 | } | |
72d0e1cb | 4499 | |
72d0e1cb SG |
4500 | int lxc_clear_config_caps(struct lxc_conf *c) |
4501 | { | |
1a0e70ac | 4502 | struct lxc_list *it, *next; |
72d0e1cb | 4503 | |
0fd73091 | 4504 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
4505 | lxc_list_del(it); |
4506 | free(it->elem); | |
4507 | free(it); | |
4508 | } | |
0fd73091 | 4509 | |
cc36133d | 4510 | lxc_list_init(&c->caps); |
72d0e1cb SG |
4511 | return 0; |
4512 | } | |
4513 | ||
0589d744 | 4514 | static int lxc_free_idmap(struct list_head *id_map) |
c7e345ae | 4515 | { |
0589d744 | 4516 | struct id_map *map, *nmap; |
27c27d73 | 4517 | |
0589d744 CB |
4518 | list_for_each_entry_safe(map, nmap, id_map, head) { |
4519 | list_del(&map->head); | |
4520 | free(map); | |
27c27d73 | 4521 | } |
c7e345ae | 4522 | |
0589d744 | 4523 | INIT_LIST_HEAD(id_map); |
27c27d73 SH |
4524 | return 0; |
4525 | } | |
7e621263 | 4526 | |
0589d744 | 4527 | static int __lxc_free_idmap(struct list_head *id_map) |
7e621263 CB |
4528 | { |
4529 | lxc_free_idmap(id_map); | |
7e621263 CB |
4530 | return 0; |
4531 | } | |
0589d744 | 4532 | define_cleanup_function(struct list_head *, __lxc_free_idmap); |
27c27d73 | 4533 | |
4355ab5f SH |
4534 | int lxc_clear_idmaps(struct lxc_conf *c) |
4535 | { | |
4536 | return lxc_free_idmap(&c->id_map); | |
4537 | } | |
4538 | ||
1fb86a7c SH |
4539 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4540 | { | |
0fd73091 | 4541 | struct lxc_list *it, *next; |
1fb86a7c | 4542 | |
0fd73091 | 4543 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
4544 | lxc_list_del(it); |
4545 | free(it->elem); | |
4546 | free(it); | |
4547 | } | |
0fd73091 | 4548 | |
cc36133d | 4549 | lxc_list_init(&c->keepcaps); |
1fb86a7c SH |
4550 | return 0; |
4551 | } | |
4552 | ||
a3ed9b81 | 4553 | int lxc_clear_namespace(struct lxc_conf *c) |
4554 | { | |
ced5587c CB |
4555 | for (int i = 0; i < LXC_NS_MAX; i++) |
4556 | free_disarm(c->ns_share[i]); | |
4557 | ||
a3ed9b81 | 4558 | return 0; |
4559 | } | |
4560 | ||
54860ed0 | 4561 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 4562 | { |
ab1a6cac | 4563 | const char *k = key; |
54860ed0 | 4564 | bool all = false; |
c9dbb8ed CB |
4565 | char *global_token, *namespaced_token; |
4566 | size_t namespaced_token_len; | |
4567 | struct list_head *list; | |
4568 | struct lxc_cgroup *cgroup, *ncgroup; | |
72d0e1cb | 4569 | |
54860ed0 | 4570 | if (version == CGROUP2_SUPER_MAGIC) { |
d6c06927 CB |
4571 | global_token = "lxc.cgroup2"; |
4572 | namespaced_token = "lxc.cgroup2."; | |
4573 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); | |
54860ed0 CB |
4574 | list = &c->cgroup2; |
4575 | } else if (version == CGROUP_SUPER_MAGIC) { | |
d6c06927 CB |
4576 | global_token = "lxc.cgroup"; |
4577 | namespaced_token = "lxc.cgroup."; | |
4578 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); | |
54860ed0 CB |
4579 | list = &c->cgroup; |
4580 | } else { | |
d6c06927 | 4581 | return ret_errno(EINVAL); |
54860ed0 CB |
4582 | } |
4583 | ||
71528742 | 4584 | if (strequal(key, global_token)) |
72d0e1cb | 4585 | all = true; |
eed95eb0 | 4586 | else if (strnequal(key, namespaced_token, namespaced_token_len)) |
ab1a6cac | 4587 | k += namespaced_token_len; |
a6390f01 | 4588 | else |
d6c06927 | 4589 | return ret_errno(EINVAL); |
72d0e1cb | 4590 | |
c9dbb8ed CB |
4591 | list_for_each_entry_safe(cgroup, ncgroup, list, head) { |
4592 | if (!all && !strequal(cgroup->subsystem, k)) | |
72d0e1cb | 4593 | continue; |
54860ed0 | 4594 | |
c9dbb8ed CB |
4595 | list_del(&cgroup->head); |
4596 | free(cgroup->subsystem); | |
4597 | free(cgroup->value); | |
4598 | free(cgroup); | |
72d0e1cb | 4599 | } |
e409b214 | 4600 | |
cc36133d | 4601 | if (all) |
c9dbb8ed | 4602 | INIT_LIST_HEAD(list); |
cc36133d | 4603 | |
72d0e1cb SG |
4604 | return 0; |
4605 | } | |
4606 | ||
a7744f12 | 4607 | static inline void lxc_clear_cgroups_devices(struct lxc_conf *conf) |
4bfb655e | 4608 | { |
a7744f12 | 4609 | lxc_clear_cgroup2_devices(&conf->bpf_devices); |
4bfb655e CB |
4610 | } |
4611 | ||
c6d09e15 WB |
4612 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
4613 | { | |
c6d09e15 | 4614 | const char *k = NULL; |
0fd73091 | 4615 | bool all = false; |
223797c3 | 4616 | struct lxc_limit *lim, *nlim; |
c6d09e15 | 4617 | |
71528742 | 4618 | if (strequal(key, "lxc.limit") || strequal(key, "lxc.prlimit")) |
c6d09e15 | 4619 | all = true; |
eed95eb0 | 4620 | else if (strnequal(key, "lxc.limit.", STRLITERALLEN("lxc.limit."))) |
6333c915 | 4621 | k = key + STRLITERALLEN("lxc.limit."); |
eed95eb0 | 4622 | else if (strnequal(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit."))) |
6333c915 | 4623 | k = key + STRLITERALLEN("lxc.prlimit."); |
c6d09e15 | 4624 | else |
786467cb | 4625 | return ret_errno(EINVAL); |
c6d09e15 | 4626 | |
223797c3 | 4627 | list_for_each_entry_safe(lim, nlim, &c->limits, head) { |
71528742 | 4628 | if (!all && !strequal(lim->resource, k)) |
c6d09e15 | 4629 | continue; |
0fd73091 | 4630 | |
223797c3 | 4631 | list_del(&lim->head); |
786467cb | 4632 | free_disarm(lim->resource); |
c6d09e15 | 4633 | free(lim); |
c6d09e15 | 4634 | } |
b668653c | 4635 | |
786467cb | 4636 | if (all) |
223797c3 | 4637 | INIT_LIST_HEAD(&c->limits); |
786467cb | 4638 | |
c6d09e15 WB |
4639 | return 0; |
4640 | } | |
4641 | ||
7edd0540 L |
4642 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
4643 | { | |
7edd0540 | 4644 | const char *k = NULL; |
0fd73091 | 4645 | bool all = false; |
ba9f9347 | 4646 | struct lxc_sysctl *sysctl, *nsysctl; |
7edd0540 | 4647 | |
71528742 | 4648 | if (strequal(key, "lxc.sysctl")) |
7edd0540 | 4649 | all = true; |
eed95eb0 | 4650 | else if (strnequal(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl."))) |
6333c915 | 4651 | k = key + STRLITERALLEN("lxc.sysctl."); |
7edd0540 L |
4652 | else |
4653 | return -1; | |
4654 | ||
ba9f9347 CB |
4655 | list_for_each_entry_safe(sysctl, nsysctl, &c->sysctls, head) { |
4656 | if (!all && !strequal(sysctl->key, k)) | |
7edd0540 | 4657 | continue; |
0fd73091 | 4658 | |
ba9f9347 CB |
4659 | list_del(&sysctl->head); |
4660 | free(sysctl->key); | |
4661 | free(sysctl->value); | |
4662 | free(sysctl); | |
7edd0540 | 4663 | } |
0fd73091 | 4664 | |
4a2c9b40 | 4665 | if (all) |
ba9f9347 | 4666 | INIT_LIST_HEAD(&c->sysctls); |
4a2c9b40 | 4667 | |
7edd0540 L |
4668 | return 0; |
4669 | } | |
4670 | ||
61d7a733 YT |
4671 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
4672 | { | |
61d7a733 | 4673 | const char *k = NULL; |
0fd73091 | 4674 | bool all = false; |
91d04bf9 | 4675 | struct lxc_proc *proc, *nproc; |
61d7a733 | 4676 | |
71528742 | 4677 | if (strequal(key, "lxc.proc")) |
61d7a733 | 4678 | all = true; |
eed95eb0 | 4679 | else if (strnequal(key, "lxc.proc.", STRLITERALLEN("lxc.proc."))) |
6333c915 | 4680 | k = key + STRLITERALLEN("lxc.proc."); |
61d7a733 YT |
4681 | else |
4682 | return -1; | |
4683 | ||
91d04bf9 | 4684 | list_for_each_entry_safe(proc, nproc, &c->procs, head) { |
71528742 | 4685 | if (!all && !strequal(proc->filename, k)) |
61d7a733 | 4686 | continue; |
0fd73091 | 4687 | |
91d04bf9 | 4688 | list_del(&proc->head); |
61d7a733 YT |
4689 | free(proc->filename); |
4690 | free(proc->value); | |
4691 | free(proc); | |
61d7a733 YT |
4692 | } |
4693 | ||
cc36133d | 4694 | if (all) |
91d04bf9 | 4695 | INIT_LIST_HEAD(&c->procs); |
cc36133d | 4696 | |
61d7a733 YT |
4697 | return 0; |
4698 | } | |
4699 | ||
ee1e7aa0 SG |
4700 | int lxc_clear_groups(struct lxc_conf *c) |
4701 | { | |
0fd73091 | 4702 | struct lxc_list *it, *next; |
ee1e7aa0 | 4703 | |
0fd73091 | 4704 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
4705 | lxc_list_del(it); |
4706 | free(it->elem); | |
4707 | free(it); | |
4708 | } | |
0fd73091 | 4709 | |
cc36133d | 4710 | lxc_list_init(&c->groups); |
ee1e7aa0 SG |
4711 | return 0; |
4712 | } | |
4713 | ||
ab799c0b SG |
4714 | int lxc_clear_environment(struct lxc_conf *c) |
4715 | { | |
0fd73091 | 4716 | struct lxc_list *it, *next; |
ab799c0b | 4717 | |
0fd73091 | 4718 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
4719 | lxc_list_del(it); |
4720 | free(it->elem); | |
4721 | free(it); | |
4722 | } | |
0fd73091 | 4723 | |
cc36133d | 4724 | lxc_list_init(&c->environment); |
ab799c0b SG |
4725 | return 0; |
4726 | } | |
4727 | ||
72d0e1cb SG |
4728 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4729 | { | |
0fd73091 | 4730 | struct lxc_list *it, *next; |
72d0e1cb | 4731 | |
0fd73091 | 4732 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
4733 | lxc_list_del(it); |
4734 | free(it->elem); | |
4735 | free(it); | |
4736 | } | |
0fd73091 | 4737 | |
cc36133d | 4738 | lxc_list_init(&c->mount_list); |
72d0e1cb SG |
4739 | return 0; |
4740 | } | |
4741 | ||
b099e9e9 SH |
4742 | int lxc_clear_automounts(struct lxc_conf *c) |
4743 | { | |
4744 | c->auto_mounts = 0; | |
4745 | return 0; | |
4746 | } | |
4747 | ||
12a50cc6 | 4748 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4749 | { |
0fd73091 CB |
4750 | struct lxc_list *it, *next; |
4751 | const char *k = NULL; | |
4752 | bool all = false, done = false; | |
72d0e1cb | 4753 | |
71528742 | 4754 | if (strequal(key, "lxc.hook")) |
17ed13a3 | 4755 | all = true; |
eed95eb0 | 4756 | else if (strnequal(key, "lxc.hook.", STRLITERALLEN("lxc.hook."))) |
6333c915 | 4757 | k = key + STRLITERALLEN("lxc.hook."); |
a6390f01 WB |
4758 | else |
4759 | return -1; | |
17ed13a3 | 4760 | |
ced5587c | 4761 | for (int i = 0; i < NUM_LXC_HOOKS; i++) { |
71528742 | 4762 | if (all || strequal(k, lxchook_names[i])) { |
0fd73091 | 4763 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4764 | lxc_list_del(it); |
4765 | free(it->elem); | |
4766 | free(it); | |
4767 | } | |
cc36133d | 4768 | lxc_list_init(&c->hooks[i]); |
0fd73091 | 4769 | |
17ed13a3 | 4770 | done = true; |
72d0e1cb SG |
4771 | } |
4772 | } | |
17ed13a3 | 4773 | |
55022530 CB |
4774 | if (!done) |
4775 | return log_error(-1, "Invalid hook key: %s", key); | |
0fd73091 | 4776 | |
72d0e1cb SG |
4777 | return 0; |
4778 | } | |
8eb5694b | 4779 | |
4184c3e1 SH |
4780 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4781 | { | |
0fd73091 | 4782 | struct lxc_list *it, *next; |
4184c3e1 | 4783 | |
0fd73091 | 4784 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4785 | lxc_list_del(it); |
4786 | free(it->elem); | |
4787 | free(it); | |
4788 | } | |
cc36133d CB |
4789 | |
4790 | lxc_list_init(&conf->aliens); | |
4184c3e1 SH |
4791 | } |
4792 | ||
c7b15d1e | 4793 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4794 | { |
0fd73091 | 4795 | struct lxc_list *it, *next; |
f979ac15 | 4796 | |
ced5587c | 4797 | lxc_list_for_each_safe(it, &conf->includes, next) { |
f979ac15 SH |
4798 | lxc_list_del(it); |
4799 | free(it->elem); | |
4800 | free(it); | |
4801 | } | |
cc36133d CB |
4802 | |
4803 | lxc_list_init(&conf->includes); | |
f979ac15 SH |
4804 | } |
4805 | ||
1800f924 WB |
4806 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4807 | { | |
4808 | struct lxc_list *it, *next; | |
4809 | ||
4810 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4811 | lxc_list_del(it); | |
4812 | free(it->elem); | |
4813 | free(it); | |
4814 | } | |
4815 | ||
cc36133d | 4816 | lxc_list_init(&c->lsm_aa_raw); |
1800f924 WB |
4817 | return 0; |
4818 | } | |
4819 | ||
8eb5694b SH |
4820 | void lxc_conf_free(struct lxc_conf *conf) |
4821 | { | |
4822 | if (!conf) | |
4823 | return; | |
0fd73091 | 4824 | |
858377e4 SH |
4825 | if (current_config == conf) |
4826 | current_config = NULL; | |
aed105d5 | 4827 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4828 | free(conf->rootfs.mount); |
b3b8c97f | 4829 | free(conf->rootfs.bdev_type); |
f10fad2f | 4830 | free(conf->rootfs.path); |
79ff643d | 4831 | put_lxc_rootfs(&conf->rootfs, true); |
f10fad2f | 4832 | free(conf->logfile); |
858377e4 SH |
4833 | if (conf->logfd != -1) |
4834 | close(conf->logfd); | |
f10fad2f | 4835 | free(conf->utsname); |
885766f5 CB |
4836 | free(conf->ttys.dir); |
4837 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4838 | free(conf->fstab); |
4839 | free(conf->rcfile); | |
5cda27c1 | 4840 | free(conf->execute_cmd); |
f10fad2f | 4841 | free(conf->init_cmd); |
bf31b337 | 4842 | free(conf->init_groups.list); |
3c491553 | 4843 | free(conf->init_cwd); |
6b0d5538 | 4844 | free(conf->unexpanded_config); |
76d0127f | 4845 | free(conf->syslog); |
87d0990c | 4846 | lxc_free_networks(conf); |
f10fad2f | 4847 | free(conf->lsm_aa_profile); |
1800f924 | 4848 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4849 | free(conf->lsm_se_context); |
1ed59e6d | 4850 | free(conf->lsm_se_keyring_context); |
c3e3c21a | 4851 | lxc_seccomp_free(&conf->seccomp); |
8eb5694b | 4852 | lxc_clear_config_caps(conf); |
1fb86a7c | 4853 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4854 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4855 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
a7744f12 | 4856 | lxc_clear_cgroups_devices(conf); |
17ed13a3 | 4857 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4858 | lxc_clear_mount_entries(conf); |
27c27d73 | 4859 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4860 | lxc_clear_groups(conf); |
f979ac15 | 4861 | lxc_clear_includes(conf); |
761d81ca | 4862 | lxc_clear_aliens(conf); |
ab799c0b | 4863 | lxc_clear_environment(conf); |
240d4b74 | 4864 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4865 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4866 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4867 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 4868 | lxc_clear_namespace(conf); |
43654d34 | 4869 | free(conf->cgroup_meta.dir); |
a900cbaf | 4870 | free(conf->cgroup_meta.monitor_dir); |
eb60b564 | 4871 | free(conf->cgroup_meta.monitor_pivot_dir); |
a900cbaf WB |
4872 | free(conf->cgroup_meta.container_dir); |
4873 | free(conf->cgroup_meta.namespace_dir); | |
43654d34 | 4874 | free(conf->cgroup_meta.controllers); |
7a41e857 LT |
4875 | free(conf->shmount.path_host); |
4876 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4877 | free(conf); |
4878 | } | |
4355ab5f SH |
4879 | |
4880 | struct userns_fn_data { | |
4881 | int (*fn)(void *); | |
c9b7c33e | 4882 | const char *fn_name; |
4355ab5f SH |
4883 | void *arg; |
4884 | int p[2]; | |
4885 | }; | |
4886 | ||
4887 | static int run_userns_fn(void *data) | |
4888 | { | |
766c5b6d | 4889 | struct userns_fn_data *d = data; |
adaffdd7 | 4890 | int ret; |
4355ab5f | 4891 | char c; |
4355ab5f | 4892 | |
766c5b6d | 4893 | close_prot_errno_disarm(d->p[1]); |
f8aa4bf3 | 4894 | |
766c5b6d CB |
4895 | /* |
4896 | * Wait for parent to finish establishing a new mapping in the user | |
f8aa4bf3 CB |
4897 | * namespace we are executing in. |
4898 | */ | |
adaffdd7 | 4899 | ret = lxc_read_nointr(d->p[0], &c, 1); |
766c5b6d | 4900 | close_prot_errno_disarm(d->p[0]); |
adaffdd7 CB |
4901 | if (ret != 1) |
4902 | return -1; | |
f8aa4bf3 | 4903 | |
c9b7c33e | 4904 | if (d->fn_name) |
adaffdd7 | 4905 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4906 | |
f8aa4bf3 | 4907 | /* Call function to run. */ |
4355ab5f SH |
4908 | return d->fn(d->arg); |
4909 | } | |
4910 | ||
7581a82f | 4911 | static struct id_map *mapped_nsid_add(const struct lxc_conf *conf, unsigned id, |
db7cfe23 CB |
4912 | enum idtype idtype) |
4913 | { | |
5173b710 CB |
4914 | const struct id_map *map; |
4915 | struct id_map *retmap; | |
db7cfe23 CB |
4916 | |
4917 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4918 | if (!map) | |
4919 | return NULL; | |
4920 | ||
b8e43ef0 | 4921 | retmap = zalloc(sizeof(*retmap)); |
db7cfe23 CB |
4922 | if (!retmap) |
4923 | return NULL; | |
4924 | ||
4925 | memcpy(retmap, map, sizeof(*retmap)); | |
4926 | return retmap; | |
4927 | } | |
4928 | ||
0589d744 | 4929 | static struct id_map *find_mapped_hostid_entry(const struct list_head *idmap, |
c4333195 | 4930 | unsigned id, enum idtype idtype) |
f8aa4bf3 | 4931 | { |
f8aa4bf3 | 4932 | struct id_map *retmap = NULL; |
0589d744 | 4933 | struct id_map *map; |
f8aa4bf3 | 4934 | |
0589d744 | 4935 | list_for_each_entry(map, idmap, head) { |
f8aa4bf3 CB |
4936 | if (map->idtype != idtype) |
4937 | continue; | |
4938 | ||
4939 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4940 | retmap = map; | |
4941 | break; | |
4942 | } | |
4943 | } | |
4944 | ||
f8aa4bf3 CB |
4945 | return retmap; |
4946 | } | |
4947 | ||
0fd73091 | 4948 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4949 | * existing one or establish a new one. |
4355ab5f | 4950 | */ |
7581a82f | 4951 | static struct id_map *mapped_hostid_add(const struct lxc_conf *conf, uid_t id, |
0fd73091 | 4952 | enum idtype type) |
4355ab5f | 4953 | { |
55022530 | 4954 | __do_free struct id_map *entry = NULL; |
28a2d9e7 | 4955 | int hostid_mapped; |
55022530 | 4956 | struct id_map *tmp = NULL; |
c4333195 | 4957 | |
b8e43ef0 | 4958 | entry = zalloc(sizeof(*entry)); |
c4333195 CB |
4959 | if (!entry) |
4960 | return NULL; | |
f8aa4bf3 | 4961 | |
28a2d9e7 | 4962 | /* Reuse existing mapping. */ |
86c78011 | 4963 | tmp = find_mapped_hostid_entry(&conf->id_map, id, type); |
1758c195 CB |
4964 | if (tmp) { |
4965 | memcpy(entry, tmp, sizeof(*entry)); | |
4966 | } else { | |
4967 | /* Find new mapping. */ | |
4968 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4969 | if (hostid_mapped < 0) | |
4970 | return log_debug(NULL, "Failed to find free mapping for id %d", id); | |
4971 | ||
4972 | entry->idtype = type; | |
4973 | entry->nsid = hostid_mapped; | |
4974 | entry->hostid = (unsigned long)id; | |
4975 | entry->range = 1; | |
4976 | } | |
4355ab5f | 4977 | |
55022530 | 4978 | return move_ptr(entry); |
4355ab5f SH |
4979 | } |
4980 | ||
0589d744 CB |
4981 | static int get_minimal_idmap(const struct lxc_conf *conf, uid_t *resuid, |
4982 | gid_t *resgid, struct list_head *head_ret) | |
4355ab5f | 4983 | { |
00d6cfe2 CB |
4984 | __do_free struct id_map *container_root_uid = NULL, |
4985 | *container_root_gid = NULL, | |
4986 | *host_uid_map = NULL, *host_gid_map = NULL; | |
f8aa4bf3 | 4987 | uid_t euid, egid; |
4160c3a0 CB |
4988 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4989 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
4355ab5f | 4990 | |
db7cfe23 | 4991 | /* Find container root mappings. */ |
4160c3a0 | 4992 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
55022530 | 4993 | if (!container_root_uid) |
0589d744 | 4994 | return sysdebug("Failed to find mapping for namespace uid %d", 0); |
dcf0ffdf CB |
4995 | euid = geteuid(); |
4996 | if (euid >= container_root_uid->hostid && | |
4997 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
2c996219 | 4998 | host_uid_map = move_ptr(container_root_uid); |
f8aa4bf3 | 4999 | |
4160c3a0 | 5000 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
55022530 | 5001 | if (!container_root_gid) |
0589d744 | 5002 | return sysdebug("Failed to find mapping for namespace gid %d", 0); |
dcf0ffdf CB |
5003 | egid = getegid(); |
5004 | if (egid >= container_root_gid->hostid && | |
5005 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
2c996219 | 5006 | host_gid_map = move_ptr(container_root_gid); |
f8aa4bf3 CB |
5007 | |
5008 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 5009 | if (!host_uid_map) |
c4333195 | 5010 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
55022530 | 5011 | if (!host_uid_map) |
0589d744 | 5012 | return sysdebug("Failed to find mapping for uid %d", euid); |
f8aa4bf3 | 5013 | |
dcf0ffdf CB |
5014 | if (!host_gid_map) |
5015 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
55022530 | 5016 | if (!host_gid_map) |
0589d744 | 5017 | return sysdebug("Failed to find mapping for gid %d", egid); |
28a2d9e7 | 5018 | |
47649d5b | 5019 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5020 | list_add_tail(&host_uid_map->head, head_ret); |
5021 | move_ptr(host_uid_map); | |
28a2d9e7 | 5022 | |
2c996219 | 5023 | if (container_root_uid) { |
47649d5b | 5024 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5025 | list_add_tail(&container_root_uid->head, head_ret); |
5026 | move_ptr(container_root_uid); | |
28a2d9e7 | 5027 | } |
f8aa4bf3 | 5028 | |
47649d5b | 5029 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5030 | list_add_tail(&host_gid_map->head, head_ret); |
5031 | move_ptr(host_gid_map); | |
28a2d9e7 | 5032 | |
2c996219 | 5033 | if (container_root_gid) { |
47649d5b | 5034 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5035 | list_add_tail(&container_root_gid->head, head_ret); |
5036 | move_ptr(container_root_gid); | |
28a2d9e7 | 5037 | } |
f8aa4bf3 | 5038 | |
dbfcdf86 CB |
5039 | TRACE("Allocated minimal idmapping for ns uid %d and ns gid %d", nsuid, nsgid); |
5040 | ||
5041 | if (resuid) | |
5042 | *resuid = nsuid; | |
5043 | if (resgid) | |
5044 | *resgid = nsgid; | |
0589d744 CB |
5045 | |
5046 | return 0; | |
dcf0ffdf CB |
5047 | } |
5048 | ||
766c5b6d CB |
5049 | /* |
5050 | * Run a function in a new user namespace. | |
dcf0ffdf CB |
5051 | * The caller's euid/egid will be mapped if it is not already. |
5052 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
5053 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
5054 | * This means we require only to establish a mapping from: | |
5055 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
5056 | * - the container root -> some sub{g,u}id | |
915e3dbd | 5057 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 5058 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
5059 | * there to start the container in the first place. |
5060 | */ | |
7581a82f | 5061 | int userns_exec_1(const struct lxc_conf *conf, int (*fn)(void *), void *data, |
dcf0ffdf CB |
5062 | const char *fn_name) |
5063 | { | |
0589d744 CB |
5064 | LIST_HEAD(minimal_idmap); |
5065 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &minimal_idmap; | |
0fd73091 CB |
5066 | int ret = -1, status = -1; |
5067 | char c = '1'; | |
46bc6f2a CB |
5068 | struct userns_fn_data d = { |
5069 | .arg = data, | |
5070 | .fn = fn, | |
5071 | .fn_name = fn_name, | |
5072 | }; | |
766c5b6d CB |
5073 | pid_t pid; |
5074 | int pipe_fds[2]; | |
dcf0ffdf | 5075 | |
2b2655a8 CB |
5076 | if (!conf) |
5077 | return -EINVAL; | |
5078 | ||
0589d744 CB |
5079 | ret = get_minimal_idmap(conf, NULL, NULL, idmap); |
5080 | if (ret) | |
766c5b6d | 5081 | return ret_errno(ENOENT); |
dcf0ffdf | 5082 | |
766c5b6d CB |
5083 | ret = pipe2(pipe_fds, O_CLOEXEC); |
5084 | if (ret < 0) | |
5085 | return -errno; | |
5086 | ||
766c5b6d CB |
5087 | d.p[0] = pipe_fds[0]; |
5088 | d.p[1] = pipe_fds[1]; | |
dcf0ffdf CB |
5089 | |
5090 | /* Clone child in new user namespace. */ | |
a59440be | 5091 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
dcf0ffdf | 5092 | if (pid < 0) { |
0fd73091 | 5093 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
5094 | goto on_error; |
5095 | } | |
5096 | ||
766c5b6d | 5097 | close_prot_errno_disarm(pipe_fds[0]); |
dcf0ffdf | 5098 | |
62fef886 | 5099 | if (lxc_log_trace()) { |
dcf0ffdf CB |
5100 | struct id_map *map; |
5101 | ||
0589d744 | 5102 | list_for_each_entry(map, idmap, head) |
766c5b6d CB |
5103 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5104 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
4355ab5f SH |
5105 | } |
5106 | ||
f8aa4bf3 | 5107 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 5108 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 5109 | if (ret < 0) { |
0fd73091 | 5110 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 5111 | goto on_error; |
4355ab5f SH |
5112 | } |
5113 | ||
f8aa4bf3 | 5114 | /* Tell child to proceed. */ |
766c5b6d | 5115 | if (lxc_write_nointr(pipe_fds[1], &c, 1) != 1) { |
dcf0ffdf | 5116 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 5117 | goto on_error; |
4355ab5f SH |
5118 | } |
5119 | ||
686dd5d1 | 5120 | on_error: |
766c5b6d CB |
5121 | close_prot_errno_disarm(pipe_fds[0]); |
5122 | close_prot_errno_disarm(pipe_fds[1]); | |
f8aa4bf3 | 5123 | |
ee1b16bc TA |
5124 | /* Wait for child to finish. */ |
5125 | if (pid > 0) | |
5126 | status = wait_for_pid(pid); | |
5127 | ||
686dd5d1 CB |
5128 | if (status < 0) |
5129 | ret = -1; | |
5130 | ||
f8aa4bf3 | 5131 | return ret; |
4355ab5f | 5132 | } |
97e9cfa0 | 5133 | |
d1783ef4 CB |
5134 | int userns_exec_minimal(const struct lxc_conf *conf, |
5135 | int (*fn_parent)(void *), void *fn_parent_data, | |
5136 | int (*fn_child)(void *), void *fn_child_data) | |
edf88289 | 5137 | { |
0589d744 CB |
5138 | LIST_HEAD(minimal_idmap); |
5139 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &minimal_idmap; | |
dbfcdf86 CB |
5140 | uid_t resuid = LXC_INVALID_UID; |
5141 | gid_t resgid = LXC_INVALID_GID; | |
edf88289 | 5142 | char c = '1'; |
dbfcdf86 | 5143 | ssize_t ret; |
edf88289 CB |
5144 | pid_t pid; |
5145 | int sock_fds[2]; | |
5146 | ||
d1783ef4 | 5147 | if (!conf || !fn_child) |
dbfcdf86 | 5148 | return ret_errno(EINVAL); |
edf88289 | 5149 | |
0589d744 CB |
5150 | ret = get_minimal_idmap(conf, &resuid, &resgid, idmap); |
5151 | if (ret) | |
edf88289 CB |
5152 | return ret_errno(ENOENT); |
5153 | ||
5154 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
5155 | if (ret < 0) | |
5156 | return -errno; | |
5157 | ||
5158 | pid = fork(); | |
5159 | if (pid < 0) { | |
dbfcdf86 | 5160 | SYSERROR("Failed to create new process"); |
edf88289 CB |
5161 | goto on_error; |
5162 | } | |
5163 | ||
5164 | if (pid == 0) { | |
5165 | close_prot_errno_disarm(sock_fds[1]); | |
5166 | ||
5167 | ret = unshare(CLONE_NEWUSER); | |
dbfcdf86 CB |
5168 | if (ret < 0) { |
5169 | SYSERROR("Failed to unshare new user namespace"); | |
edf88289 | 5170 | _exit(EXIT_FAILURE); |
dbfcdf86 | 5171 | } |
edf88289 | 5172 | |
dbfcdf86 CB |
5173 | ret = lxc_write_nointr(sock_fds[0], &c, 1); |
5174 | if (ret != 1) | |
edf88289 CB |
5175 | _exit(EXIT_FAILURE); |
5176 | ||
5177 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
5178 | if (ret != 1) | |
5179 | _exit(EXIT_FAILURE); | |
5180 | ||
5181 | close_prot_errno_disarm(sock_fds[0]); | |
5182 | ||
8917c382 | 5183 | if (!lxc_drop_groups() && errno != EPERM) |
edf88289 CB |
5184 | _exit(EXIT_FAILURE); |
5185 | ||
dbfcdf86 CB |
5186 | ret = setresgid(resgid, resgid, resgid); |
5187 | if (ret < 0) { | |
5188 | SYSERROR("Failed to setresgid(%d, %d, %d)", | |
5189 | resgid, resgid, resgid); | |
edf88289 | 5190 | _exit(EXIT_FAILURE); |
dbfcdf86 CB |
5191 | } |
5192 | ||
5193 | ret = setresuid(resuid, resuid, resuid); | |
5194 | if (ret < 0) { | |
5195 | SYSERROR("Failed to setresuid(%d, %d, %d)", | |
5196 | resuid, resuid, resuid); | |
5197 | _exit(EXIT_FAILURE); | |
5198 | } | |
edf88289 | 5199 | |
d1783ef4 | 5200 | ret = fn_child(fn_child_data); |
dbfcdf86 CB |
5201 | if (ret) { |
5202 | SYSERROR("Running function in new user namespace failed"); | |
edf88289 | 5203 | _exit(EXIT_FAILURE); |
dbfcdf86 | 5204 | } |
edf88289 CB |
5205 | |
5206 | _exit(EXIT_SUCCESS); | |
5207 | } | |
5208 | ||
5209 | close_prot_errno_disarm(sock_fds[0]); | |
5210 | ||
62fef886 | 5211 | if (lxc_log_trace()) { |
edf88289 | 5212 | struct id_map *map; |
edf88289 | 5213 | |
0589d744 | 5214 | list_for_each_entry(map, idmap, head) |
edf88289 CB |
5215 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5216 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
edf88289 CB |
5217 | } |
5218 | ||
5219 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
5220 | if (ret != 1) { | |
5221 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
5222 | goto on_error; | |
5223 | } | |
5224 | ||
5225 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
5226 | ret = lxc_map_ids(idmap, pid); | |
5227 | if (ret < 0) { | |
5228 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
5229 | goto on_error; | |
5230 | } | |
5231 | ||
5232 | /* Tell child to proceed. */ | |
5233 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
5234 | if (ret != 1) { | |
5235 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
5236 | goto on_error; | |
5237 | } | |
5238 | ||
d1783ef4 CB |
5239 | if (fn_parent && fn_parent(fn_parent_data)) { |
5240 | SYSERROR("Running parent function failed"); | |
5241 | _exit(EXIT_FAILURE); | |
5242 | } | |
5243 | ||
edf88289 CB |
5244 | on_error: |
5245 | close_prot_errno_disarm(sock_fds[0]); | |
5246 | close_prot_errno_disarm(sock_fds[1]); | |
5247 | ||
5248 | /* Wait for child to finish. */ | |
dbfcdf86 CB |
5249 | if (pid < 0) |
5250 | return -1; | |
edf88289 | 5251 | |
dbfcdf86 | 5252 | return wait_for_pid(pid); |
edf88289 CB |
5253 | } |
5254 | ||
415a8851 CB |
5255 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
5256 | const char *fn_name) | |
5257 | { | |
0589d744 CB |
5258 | LIST_HEAD(full_idmap); |
5259 | int ret = -1; | |
5260 | char c = '1'; | |
5261 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
5262 | *host_uid_map = NULL, *host_gid_map = NULL; | |
415a8851 CB |
5263 | pid_t pid; |
5264 | uid_t euid, egid; | |
415a8851 CB |
5265 | int p[2]; |
5266 | struct id_map *map; | |
0fd73091 | 5267 | struct userns_fn_data d; |
415a8851 | 5268 | |
2b2655a8 CB |
5269 | if (!conf) |
5270 | return -EINVAL; | |
5271 | ||
979f9e34 | 5272 | ret = pipe2(p, O_CLOEXEC); |
0589d744 CB |
5273 | if (ret < 0) |
5274 | return -errno; | |
5275 | ||
415a8851 CB |
5276 | d.fn = fn; |
5277 | d.fn_name = fn_name; | |
5278 | d.arg = data; | |
5279 | d.p[0] = p[0]; | |
5280 | d.p[1] = p[1]; | |
5281 | ||
5282 | /* Clone child in new user namespace. */ | |
33258b95 | 5283 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
415a8851 | 5284 | if (pid < 0) { |
0fd73091 | 5285 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
5286 | goto on_error; |
5287 | } | |
5288 | ||
5289 | close(p[0]); | |
5290 | p[0] = -1; | |
5291 | ||
5292 | euid = geteuid(); | |
5293 | egid = getegid(); | |
5294 | ||
415a8851 | 5295 | /* Find container root. */ |
0589d744 CB |
5296 | list_for_each_entry(map, &conf->id_map, head) { |
5297 | __do_free struct id_map *dup_map = NULL; | |
415a8851 | 5298 | |
0589d744 CB |
5299 | dup_map = memdup(map, sizeof(struct id_map)); |
5300 | if (!dup_map) | |
415a8851 CB |
5301 | goto on_error; |
5302 | ||
0589d744 CB |
5303 | list_add_tail(&dup_map->head, &full_idmap); |
5304 | move_ptr(dup_map); | |
415a8851 CB |
5305 | |
5306 | if (map->idtype == ID_TYPE_UID) | |
5307 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
5308 | host_uid_map = map; | |
5309 | ||
5310 | if (map->idtype == ID_TYPE_GID) | |
5311 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
5312 | host_gid_map = map; | |
5313 | ||
5314 | if (map->nsid != 0) | |
5315 | continue; | |
5316 | ||
5317 | if (map->idtype == ID_TYPE_UID) | |
5318 | if (container_root_uid == NULL) | |
5319 | container_root_uid = map; | |
5320 | ||
5321 | if (map->idtype == ID_TYPE_GID) | |
5322 | if (container_root_gid == NULL) | |
5323 | container_root_gid = map; | |
5324 | } | |
5325 | ||
5326 | if (!container_root_uid || !container_root_gid) { | |
5327 | ERROR("No mapping for container root found"); | |
5328 | goto on_error; | |
5329 | } | |
5330 | ||
5331 | /* Check whether the {g,u}id of the user has a mapping. */ | |
5332 | if (!host_uid_map) | |
c4333195 | 5333 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
5334 | else |
5335 | host_uid_map = container_root_uid; | |
5336 | ||
5337 | if (!host_gid_map) | |
c4333195 | 5338 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
5339 | else |
5340 | host_gid_map = container_root_gid; | |
5341 | ||
5342 | if (!host_uid_map) { | |
5343 | DEBUG("Failed to find mapping for uid %d", euid); | |
5344 | goto on_error; | |
5345 | } | |
5346 | ||
5347 | if (!host_gid_map) { | |
5348 | DEBUG("Failed to find mapping for gid %d", egid); | |
5349 | goto on_error; | |
5350 | } | |
5351 | ||
5352 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
0589d744 CB |
5353 | /* idmap will now keep track of that memory. */ |
5354 | list_add_tail(&host_uid_map->head, &full_idmap); | |
5355 | move_ptr(host_uid_map); | |
415a8851 | 5356 | } |
415a8851 CB |
5357 | |
5358 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
0589d744 CB |
5359 | /* idmap will now keep track of that memory. */ |
5360 | list_add_tail(&host_gid_map->head, &full_idmap); | |
5361 | move_ptr(host_gid_map); | |
415a8851 | 5362 | } |
415a8851 | 5363 | |
62fef886 | 5364 | if (lxc_log_trace()) { |
0589d744 CB |
5365 | list_for_each_entry(map, &full_idmap, head) { |
5366 | TRACE("establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", | |
415a8851 CB |
5367 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, |
5368 | map->nsid, map->hostid, map->range); | |
5369 | } | |
5370 | } | |
5371 | ||
5372 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
0589d744 | 5373 | ret = lxc_map_ids(&full_idmap, pid); |
415a8851 | 5374 | if (ret < 0) { |
0fd73091 | 5375 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
5376 | goto on_error; |
5377 | } | |
5378 | ||
5379 | /* Tell child to proceed. */ | |
489f39be | 5380 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 5381 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
5382 | goto on_error; |
5383 | } | |
5384 | ||
686dd5d1 | 5385 | on_error: |
ee1b16bc TA |
5386 | if (p[0] != -1) |
5387 | close(p[0]); | |
5388 | close(p[1]); | |
5389 | ||
415a8851 | 5390 | /* Wait for child to finish. */ |
686dd5d1 CB |
5391 | if (pid > 0) |
5392 | ret = wait_for_pid(pid); | |
415a8851 | 5393 | |
0589d744 | 5394 | __lxc_free_idmap(&full_idmap); |
80758b4b | 5395 | |
415a8851 CB |
5396 | if (host_uid_map && (host_uid_map != container_root_uid)) |
5397 | free(host_uid_map); | |
5398 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
5399 | free(host_gid_map); | |
5400 | ||
415a8851 CB |
5401 | return ret; |
5402 | } | |
5403 | ||
0589d744 | 5404 | static int add_idmap_entry(struct list_head *idmap_list, enum idtype idtype, |
234998b4 CB |
5405 | unsigned long nsid, unsigned long hostid, |
5406 | unsigned long range) | |
5407 | { | |
5408 | __do_free struct id_map *new_idmap = NULL; | |
234998b4 CB |
5409 | |
5410 | new_idmap = zalloc(sizeof(*new_idmap)); | |
5411 | if (!new_idmap) | |
5412 | return ret_errno(ENOMEM); | |
5413 | ||
5414 | new_idmap->idtype = idtype; | |
5415 | new_idmap->hostid = hostid; | |
5416 | new_idmap->nsid = nsid; | |
5417 | new_idmap->range = range; | |
5418 | ||
0589d744 CB |
5419 | list_add_tail(&new_idmap->head, idmap_list); |
5420 | move_ptr(new_idmap); | |
234998b4 CB |
5421 | |
5422 | INFO("Adding id map: type %c nsid %lu hostid %lu range %lu", | |
5423 | idtype == ID_TYPE_UID ? 'u' : 'g', nsid, hostid, range); | |
5424 | return 0; | |
5425 | } | |
5426 | ||
5427 | int userns_exec_mapped_root(const char *path, int path_fd, | |
5428 | const struct lxc_conf *conf) | |
5429 | { | |
0589d744 CB |
5430 | LIST_HEAD(idmap_list); |
5431 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &idmap_list; | |
234998b4 CB |
5432 | __do_close int fd = -EBADF; |
5433 | int target_fd = -EBADF; | |
5434 | char c = '1'; | |
5435 | ssize_t ret; | |
5436 | pid_t pid; | |
5437 | int sock_fds[2]; | |
5438 | uid_t container_host_uid, hostuid; | |
5439 | gid_t container_host_gid, hostgid; | |
5440 | struct stat st; | |
5441 | ||
5442 | if (!conf || (!path && path_fd < 0)) | |
5443 | return ret_errno(EINVAL); | |
5444 | ||
5445 | if (!path) | |
5446 | path = "(null)"; | |
5447 | ||
5448 | container_host_uid = get_mapped_rootid(conf, ID_TYPE_UID); | |
5449 | if (!uid_valid(container_host_uid)) | |
5450 | return log_error(-1, "No uid mapping for container root"); | |
5451 | ||
5452 | container_host_gid = get_mapped_rootid(conf, ID_TYPE_GID); | |
5453 | if (!gid_valid(container_host_gid)) | |
5454 | return log_error(-1, "No gid mapping for container root"); | |
5455 | ||
cf68ffd9 | 5456 | if (path_fd < 0) { |
a72c68f7 | 5457 | fd = open(path, O_CLOEXEC | O_NOCTTY); |
234998b4 CB |
5458 | if (fd < 0) |
5459 | return log_error_errno(-errno, errno, "Failed to open \"%s\"", path); | |
5460 | target_fd = fd; | |
5461 | } else { | |
5462 | target_fd = path_fd; | |
5463 | } | |
5464 | ||
5465 | hostuid = geteuid(); | |
5466 | /* We are root so chown directly. */ | |
5467 | if (hostuid == 0) { | |
5468 | ret = fchown(target_fd, container_host_uid, container_host_gid); | |
5469 | if (ret) | |
5470 | return log_error_errno(-errno, errno, | |
5471 | "Failed to fchown(%d(%s), %d, %d)", | |
5472 | target_fd, path, container_host_uid, | |
5473 | container_host_gid); | |
5474 | return log_trace(0, "Chowned %d(%s) to uid %d and %d", target_fd, path, | |
5475 | container_host_uid, container_host_gid); | |
5476 | } | |
5477 | ||
5478 | /* The container's root host id matches */ | |
5479 | if (container_host_uid == hostuid) | |
5480 | return log_info(0, "Container root id is mapped to our uid"); | |
5481 | ||
5482 | /* Get the current ids of our target. */ | |
5483 | ret = fstat(target_fd, &st); | |
5484 | if (ret) | |
5485 | return log_error_errno(-errno, errno, "Failed to stat \"%s\"", path); | |
5486 | ||
5487 | hostgid = getegid(); | |
5488 | if (st.st_uid == hostuid && mapped_hostid(st.st_gid, conf, ID_TYPE_GID) < 0) { | |
5489 | ret = fchown(target_fd, -1, hostgid); | |
5490 | if (ret) | |
5491 | return log_error_errno(-errno, errno, | |
5492 | "Failed to fchown(%d(%s), -1, %d)", | |
5493 | target_fd, path, hostgid); | |
2e8013f9 | 5494 | TRACE("Chowned %d(%s) to -1:%d", target_fd, path, hostgid); |
234998b4 CB |
5495 | } |
5496 | ||
234998b4 CB |
5497 | /* "u:0:rootuid:1" */ |
5498 | ret = add_idmap_entry(idmap, ID_TYPE_UID, 0, container_host_uid, 1); | |
5499 | if (ret < 0) | |
5500 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5501 | ||
5502 | /* "u:hostuid:hostuid:1" */ | |
5503 | ret = add_idmap_entry(idmap, ID_TYPE_UID, hostuid, hostuid, 1); | |
5504 | if (ret < 0) | |
5505 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5506 | ||
5507 | /* "g:0:rootgid:1" */ | |
5508 | ret = add_idmap_entry(idmap, ID_TYPE_GID, 0, container_host_gid, 1); | |
5509 | if (ret < 0) | |
5510 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5511 | ||
5512 | /* "g:hostgid:hostgid:1" */ | |
5513 | ret = add_idmap_entry(idmap, ID_TYPE_GID, hostgid, hostgid, 1); | |
5514 | if (ret < 0) | |
5515 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5516 | ||
5517 | if (hostgid != st.st_gid) { | |
5518 | /* "g:pathgid:rootgid+pathgid:1" */ | |
5519 | ret = add_idmap_entry(idmap, ID_TYPE_GID, st.st_gid, | |
5520 | container_host_gid + (gid_t)st.st_gid, 1); | |
5521 | if (ret < 0) | |
5522 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5523 | } | |
5524 | ||
5525 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
5526 | if (ret < 0) | |
5527 | return -errno; | |
5528 | ||
5529 | pid = fork(); | |
5530 | if (pid < 0) { | |
5531 | SYSERROR("Failed to create new process"); | |
5532 | goto on_error; | |
5533 | } | |
5534 | ||
5535 | if (pid == 0) { | |
5536 | close_prot_errno_disarm(sock_fds[1]); | |
5537 | ||
5538 | ret = unshare(CLONE_NEWUSER); | |
5539 | if (ret < 0) { | |
5540 | SYSERROR("Failed to unshare new user namespace"); | |
5541 | _exit(EXIT_FAILURE); | |
5542 | } | |
5543 | ||
5544 | ret = lxc_write_nointr(sock_fds[0], &c, 1); | |
5545 | if (ret != 1) | |
5546 | _exit(EXIT_FAILURE); | |
5547 | ||
5548 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
5549 | if (ret != 1) | |
5550 | _exit(EXIT_FAILURE); | |
5551 | ||
5552 | close_prot_errno_disarm(sock_fds[0]); | |
5553 | ||
5554 | if (!lxc_switch_uid_gid(0, 0)) | |
5555 | _exit(EXIT_FAILURE); | |
5556 | ||
8917c382 | 5557 | if (!lxc_drop_groups()) |
234998b4 CB |
5558 | _exit(EXIT_FAILURE); |
5559 | ||
8053a085 | 5560 | ret = fchown(target_fd, 0, st.st_gid); |
234998b4 | 5561 | if (ret) { |
8ea93a0f | 5562 | SYSERROR("Failed to chown %d(%s) to 0:%d", target_fd, path, st.st_gid); |
234998b4 CB |
5563 | _exit(EXIT_FAILURE); |
5564 | } | |
5565 | ||
2e8013f9 | 5566 | TRACE("Chowned %d(%s) to 0:%d", target_fd, path, st.st_gid); |
234998b4 CB |
5567 | _exit(EXIT_SUCCESS); |
5568 | } | |
5569 | ||
5570 | close_prot_errno_disarm(sock_fds[0]); | |
5571 | ||
62fef886 | 5572 | if (lxc_log_trace()) { |
234998b4 | 5573 | struct id_map *map; |
234998b4 | 5574 | |
0589d744 | 5575 | list_for_each_entry(map, idmap, head) |
234998b4 CB |
5576 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5577 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
234998b4 CB |
5578 | } |
5579 | ||
5580 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
5581 | if (ret != 1) { | |
5582 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
5583 | goto on_error; | |
5584 | } | |
5585 | ||
5586 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
5587 | ret = lxc_map_ids(idmap, pid); | |
5588 | if (ret < 0) { | |
5589 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
5590 | goto on_error; | |
5591 | } | |
5592 | ||
5593 | /* Tell child to proceed. */ | |
5594 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
5595 | if (ret != 1) { | |
5596 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
5597 | goto on_error; | |
5598 | } | |
5599 | ||
5600 | on_error: | |
5601 | close_prot_errno_disarm(sock_fds[0]); | |
5602 | close_prot_errno_disarm(sock_fds[1]); | |
5603 | ||
5604 | /* Wait for child to finish. */ | |
5605 | if (pid < 0) | |
5606 | return -1; | |
5607 | ||
5608 | return wait_for_pid(pid); | |
5609 | } | |
5610 | ||
a96a8e8c | 5611 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 5612 | static char *getuname(void) |
97e9cfa0 | 5613 | { |
4f410b2a | 5614 | __do_free char *buf = NULL; |
cb7aa5e8 DJ |
5615 | struct passwd pwent; |
5616 | struct passwd *pwentp = NULL; | |
cb7aa5e8 DJ |
5617 | size_t bufsize; |
5618 | int ret; | |
97e9cfa0 | 5619 | |
cb7aa5e8 DJ |
5620 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
5621 | if (bufsize == -1) | |
5622 | bufsize = 1024; | |
5623 | ||
b8e43ef0 | 5624 | buf = zalloc(bufsize); |
cb7aa5e8 | 5625 | if (!buf) |
97e9cfa0 SH |
5626 | return NULL; |
5627 | ||
cb7aa5e8 DJ |
5628 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
5629 | if (!pwentp) { | |
5630 | if (ret == 0) | |
5631 | WARN("Could not find matched password record."); | |
5632 | ||
55022530 | 5633 | return log_error(NULL, "Failed to get password record - %u", geteuid()); |
cb7aa5e8 DJ |
5634 | } |
5635 | ||
4f410b2a | 5636 | return strdup(pwent.pw_name); |
97e9cfa0 SH |
5637 | } |
5638 | ||
a96a8e8c | 5639 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
5640 | static char *getgname(void) |
5641 | { | |
4f410b2a | 5642 | __do_free char *buf = NULL; |
3de9fb4c DJ |
5643 | struct group grent; |
5644 | struct group *grentp = NULL; | |
3de9fb4c DJ |
5645 | size_t bufsize; |
5646 | int ret; | |
5647 | ||
5648 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
5649 | if (bufsize == -1) | |
5650 | bufsize = 1024; | |
5651 | ||
b8e43ef0 | 5652 | buf = zalloc(bufsize); |
3de9fb4c DJ |
5653 | if (!buf) |
5654 | return NULL; | |
5655 | ||
5656 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
5657 | if (!grentp) { | |
5658 | if (ret == 0) | |
5659 | WARN("Could not find matched group record"); | |
97e9cfa0 | 5660 | |
55022530 | 5661 | return log_error(NULL, "Failed to get group record - %u", getegid()); |
3de9fb4c DJ |
5662 | } |
5663 | ||
4f410b2a | 5664 | return strdup(grent.gr_name); |
97e9cfa0 SH |
5665 | } |
5666 | ||
a96a8e8c | 5667 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
5668 | void suggest_default_idmap(void) |
5669 | { | |
3a6e3bf5 | 5670 | __do_free char *gname = NULL, *line = NULL, *uname = NULL; |
4aae564f | 5671 | __do_fclose FILE *subuid_f = NULL, *subgid_f = NULL; |
97e9cfa0 | 5672 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; |
97e9cfa0 SH |
5673 | size_t len = 0; |
5674 | ||
0fd73091 CB |
5675 | uname = getuname(); |
5676 | if (!uname) | |
97e9cfa0 SH |
5677 | return; |
5678 | ||
0fd73091 | 5679 | gname = getgname(); |
3a6e3bf5 | 5680 | if (!gname) |
97e9cfa0 | 5681 | return; |
97e9cfa0 | 5682 | |
4110345b | 5683 | subuid_f = fopen(subuidfile, "re"); |
4aae564f | 5684 | if (!subuid_f) { |
97e9cfa0 | 5685 | ERROR("Your system is not configured with subuids"); |
97e9cfa0 SH |
5686 | return; |
5687 | } | |
0fd73091 | 5688 | |
4aae564f | 5689 | while (getline(&line, &len, subuid_f) != -1) { |
0fd73091 | 5690 | char *p, *p2; |
b7930180 | 5691 | size_t no_newline = 0; |
0fd73091 CB |
5692 | |
5693 | p = strchr(line, ':'); | |
97e9cfa0 SH |
5694 | if (*line == '#') |
5695 | continue; | |
5696 | if (!p) | |
5697 | continue; | |
5698 | *p = '\0'; | |
5699 | p++; | |
0fd73091 | 5700 | |
71528742 | 5701 | if (!strequal(line, uname)) |
97e9cfa0 | 5702 | continue; |
0fd73091 | 5703 | |
97e9cfa0 SH |
5704 | p2 = strchr(p, ':'); |
5705 | if (!p2) | |
5706 | continue; | |
5707 | *p2 = '\0'; | |
5708 | p2++; | |
5709 | if (!*p2) | |
5710 | continue; | |
b7930180 CB |
5711 | no_newline = strcspn(p2, "\n"); |
5712 | p2[no_newline] = '\0'; | |
5713 | ||
b7b2fde4 | 5714 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 5715 | WARN("Could not parse UID"); |
b7b2fde4 | 5716 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 5717 | WARN("Could not parse UID range"); |
97e9cfa0 | 5718 | } |
97e9cfa0 | 5719 | |
4110345b | 5720 | subgid_f = fopen(subgidfile, "re"); |
4aae564f | 5721 | if (!subgid_f) { |
97e9cfa0 | 5722 | ERROR("Your system is not configured with subgids"); |
97e9cfa0 SH |
5723 | return; |
5724 | } | |
0fd73091 | 5725 | |
4aae564f | 5726 | while (getline(&line, &len, subgid_f) != -1) { |
0fd73091 | 5727 | char *p, *p2; |
b7930180 | 5728 | size_t no_newline = 0; |
0fd73091 CB |
5729 | |
5730 | p = strchr(line, ':'); | |
97e9cfa0 SH |
5731 | if (*line == '#') |
5732 | continue; | |
5733 | if (!p) | |
5734 | continue; | |
5735 | *p = '\0'; | |
5736 | p++; | |
0fd73091 | 5737 | |
71528742 | 5738 | if (!strequal(line, uname)) |
97e9cfa0 | 5739 | continue; |
0fd73091 | 5740 | |
97e9cfa0 SH |
5741 | p2 = strchr(p, ':'); |
5742 | if (!p2) | |
5743 | continue; | |
5744 | *p2 = '\0'; | |
5745 | p2++; | |
5746 | if (!*p2) | |
5747 | continue; | |
b7930180 CB |
5748 | no_newline = strcspn(p2, "\n"); |
5749 | p2[no_newline] = '\0'; | |
5750 | ||
b7b2fde4 | 5751 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 5752 | WARN("Could not parse GID"); |
b7b2fde4 | 5753 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 5754 | WARN("Could not parse GID range"); |
97e9cfa0 | 5755 | } |
97e9cfa0 | 5756 | |
97e9cfa0 SH |
5757 | if (!urange || !grange) { |
5758 | ERROR("You do not have subuids or subgids allocated"); | |
5759 | ERROR("Unprivileged containers require subuids and subgids"); | |
5760 | return; | |
5761 | } | |
5762 | ||
5763 | ERROR("You must either run as root, or define uid mappings"); | |
5764 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
5765 | ERROR("~/.config/lxc/default.conf:"); | |
5766 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
5767 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
5768 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 | 5769 | } |
aaf26830 | 5770 | |
0fd73091 | 5771 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
5772 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
5773 | */ | |
c9dbb8ed | 5774 | void sort_cgroup_settings(struct lxc_conf *conf) |
aaf26830 | 5775 | { |
c9dbb8ed | 5776 | struct lxc_cgroup *cgroup, *memsw_limit, *ncgroup; |
aaf26830 | 5777 | |
0fd73091 | 5778 | /* Iterate over the cgroup settings and copy them to the output list. */ |
c9dbb8ed CB |
5779 | list_for_each_entry_safe(cgroup, ncgroup, &conf->cgroup, head) { |
5780 | if (strequal(cgroup->subsystem, "memory.memsw.limit_in_bytes")) { | |
aaf26830 | 5781 | /* Store the memsw_limit location */ |
c9dbb8ed CB |
5782 | memsw_limit = cgroup; |
5783 | } else if (memsw_limit && strequal(cgroup->subsystem, "memory.limit_in_bytes")) { | |
5784 | /* | |
5785 | * lxc.cgroup.memory.memsw.limit_in_bytes is found | |
0fd73091 | 5786 | * before lxc.cgroup.memory.limit_in_bytes, swap these |
c9dbb8ed CB |
5787 | * two items. |
5788 | */ | |
5789 | list_swap(&memsw_limit->head, &cgroup->head); | |
aaf26830 | 5790 | } |
aaf26830 | 5791 | } |
a7307747 | 5792 | } |