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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
1d52bdf7 CB |
23 | |
24 | #define _GNU_SOURCE | |
d06245b8 | 25 | #include "config.h" |
0d190408 | 26 | #include "confile.h" |
d06245b8 | 27 | |
9d257a2a | 28 | #include <arpa/inet.h> |
8f3e280e CB |
29 | #include <dirent.h> |
30 | #include <errno.h> | |
31 | #include <fcntl.h> | |
32 | #include <grp.h> | |
33 | #include <inttypes.h> | |
34 | #include <libgen.h> | |
9d257a2a CB |
35 | #include <linux/loop.h> |
36 | #include <net/if.h> | |
37 | #include <netinet/in.h> | |
8f3e280e CB |
38 | #include <pwd.h> |
39 | #include <stdarg.h> | |
0ad19a3f | 40 | #include <stdio.h> |
0ad19a3f | 41 | #include <stdlib.h> |
0ad19a3f | 42 | #include <string.h> |
8f3e280e CB |
43 | #include <sys/mman.h> |
44 | #include <sys/mount.h> | |
45 | #include <sys/param.h> | |
46 | #include <sys/prctl.h> | |
6a49f05e | 47 | #include <sys/sendfile.h> |
8f3e280e | 48 | #include <sys/socket.h> |
9d257a2a | 49 | #include <sys/stat.h> |
2d76d1d7 | 50 | #include <sys/syscall.h> |
9d257a2a | 51 | #include <sys/sysmacros.h> |
97e9cfa0 | 52 | #include <sys/types.h> |
8f3e280e CB |
53 | #include <sys/utsname.h> |
54 | #include <sys/wait.h> | |
9d257a2a CB |
55 | #include <time.h> |
56 | #include <unistd.h> | |
1d52bdf7 | 57 | |
af6824fc | 58 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 59 | #include <sys/mkdev.h> |
af6824fc | 60 | #endif |
af6824fc | 61 | |
614305f3 | 62 | #ifdef HAVE_STATVFS |
2938f7c8 | 63 | #include <sys/statvfs.h> |
614305f3 | 64 | #endif |
e827ff7e SG |
65 | |
66 | #if HAVE_PTY_H | |
b0a33c1e | 67 | #include <pty.h> |
e827ff7e SG |
68 | #else |
69 | #include <../include/openpty.h> | |
70 | #endif | |
0ad19a3f | 71 | |
9d257a2a CB |
72 | #if HAVE_LIBCAP |
73 | #include <sys/capability.h> | |
74 | #endif | |
75 | ||
76 | #if HAVE_SYS_PERSONALITY_H | |
77 | #include <sys/personality.h> | |
78 | #endif | |
79 | ||
f1e05b90 DJ |
80 | #ifndef HAVE_STRLCAT |
81 | #include "include/strlcat.h" | |
82 | #endif | |
83 | ||
9d257a2a CB |
84 | #if IS_BIONIC |
85 | #include <../include/lxcmntent.h> | |
86 | #else | |
87 | #include <mntent.h> | |
88 | #endif | |
89 | ||
90 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
91 | #include <../include/prlimit.h> | |
92 | #endif | |
93 | ||
e8bd4e43 | 94 | #include "af_unix.h" |
9d257a2a | 95 | #include "caps.h" |
8f3e280e | 96 | #include "cgroup.h" |
1b09f2c0 | 97 | #include "conf.h" |
1ed6ba91 | 98 | #include "confile_utils.h" |
8f3e280e | 99 | #include "error.h" |
1b09f2c0 | 100 | #include "log.h" |
0ed9b1bc | 101 | #include "lsm/lsm.h" |
025ed0f3 | 102 | #include "lxclock.h" |
8f3e280e | 103 | #include "lxcseccomp.h" |
4355ab5f | 104 | #include "namespace.h" |
8f3e280e CB |
105 | #include "network.h" |
106 | #include "parse.h" | |
732375f5 | 107 | #include "ringbuf.h" |
794248d0 | 108 | #include "start.h" |
28d832c4 | 109 | #include "storage.h" |
28d832c4 | 110 | #include "storage/overlay.h" |
0ed9b1bc | 111 | #include "terminal.h" |
8f3e280e | 112 | #include "utils.h" |
d0a36f2c | 113 | |
9d257a2a CB |
114 | #ifndef MS_PRIVATE |
115 | #define MS_PRIVATE (1<<18) | |
edaf8b1b SG |
116 | #endif |
117 | ||
9d257a2a CB |
118 | #ifndef MS_LAZYTIME |
119 | #define MS_LAZYTIME (1<<25) | |
f48b5fd8 FF |
120 | #endif |
121 | ||
ac2cecc4 | 122 | lxc_log_define(conf, lxc); |
e5bda9ee | 123 | |
0fd73091 CB |
124 | /* The lxc_conf of the container currently being worked on in an API call. |
125 | * This is used in the error calls. | |
126 | */ | |
127 | #ifdef HAVE_TLS | |
128 | __thread struct lxc_conf *current_config; | |
129 | #else | |
130 | struct lxc_conf *current_config; | |
131 | #endif | |
132 | ||
2d76d1d7 SG |
133 | /* Define pivot_root() if missing from the C library */ |
134 | #ifndef HAVE_PIVOT_ROOT | |
9d257a2a | 135 | static int pivot_root(const char *new_root, const char *put_old) |
2d76d1d7 SG |
136 | { |
137 | #ifdef __NR_pivot_root | |
8f3e280e | 138 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 139 | #else |
8f3e280e CB |
140 | errno = ENOSYS; |
141 | return -1; | |
2d76d1d7 SG |
142 | #endif |
143 | } | |
144 | #else | |
9d257a2a | 145 | extern int pivot_root(const char *new_root, const char *put_old); |
8912711c CB |
146 | #endif |
147 | ||
0fd73091 CB |
148 | char *lxchook_names[NUM_LXC_HOOKS] = { |
149 | "pre-start", | |
150 | "pre-mount", | |
151 | "mount", | |
152 | "autodev", | |
153 | "start", | |
154 | "stop", | |
155 | "post-stop", | |
156 | "clone", | |
157 | "destroy", | |
158 | "start-host" | |
159 | }; | |
72d0e1cb | 160 | |
998ac676 RT |
161 | struct mount_opt { |
162 | char *name; | |
163 | int clear; | |
164 | int flag; | |
165 | }; | |
166 | ||
81810dd1 DL |
167 | struct caps_opt { |
168 | char *name; | |
169 | int value; | |
170 | }; | |
171 | ||
c6d09e15 WB |
172 | struct limit_opt { |
173 | char *name; | |
174 | int value; | |
175 | }; | |
176 | ||
998ac676 | 177 | static struct mount_opt mount_opt[] = { |
470b359b CB |
178 | { "async", 1, MS_SYNCHRONOUS }, |
179 | { "atime", 1, MS_NOATIME }, | |
180 | { "bind", 0, MS_BIND }, | |
88d413d5 | 181 | { "defaults", 0, 0 }, |
88d413d5 | 182 | { "dev", 1, MS_NODEV }, |
470b359b | 183 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 184 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 185 | { "exec", 1, MS_NOEXEC }, |
8912711c | 186 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 187 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 188 | { "noatime", 0, MS_NOATIME }, |
470b359b | 189 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 190 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
191 | { "noexec", 0, MS_NOEXEC }, |
192 | { "nomand", 1, MS_MANDLOCK }, | |
193 | { "norelatime", 1, MS_RELATIME }, | |
194 | { "nostrictatime", 1, MS_STRICTATIME }, | |
195 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
196 | { "rbind", 0, MS_BIND|MS_REC }, |
197 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
198 | { "remount", 0, MS_REMOUNT }, |
199 | { "ro", 0, MS_RDONLY }, | |
200 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 201 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
202 | { "suid", 1, MS_NOSUID }, |
203 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 204 | { NULL, 0, 0 }, |
998ac676 RT |
205 | }; |
206 | ||
d840039e | 207 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
208 | { "private", 0, MS_PRIVATE }, |
209 | { "shared", 0, MS_SHARED }, | |
210 | { "slave", 0, MS_SLAVE }, | |
211 | { "unbindable", 0, MS_UNBINDABLE }, | |
212 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
213 | { "rshared", 0, MS_SHARED|MS_REC }, | |
214 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
215 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
216 | { NULL, 0, 0 }, | |
d840039e YT |
217 | }; |
218 | ||
81810dd1 | 219 | static struct caps_opt caps_opt[] = { |
8560cd36 | 220 | #if HAVE_LIBCAP |
0fd73091 CB |
221 | { "chown", CAP_CHOWN }, |
222 | { "dac_override", CAP_DAC_OVERRIDE }, | |
223 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
224 | { "fowner", CAP_FOWNER }, | |
225 | { "fsetid", CAP_FSETID }, | |
226 | { "kill", CAP_KILL }, | |
227 | { "setgid", CAP_SETGID }, | |
228 | { "setuid", CAP_SETUID }, | |
229 | { "setpcap", CAP_SETPCAP }, | |
230 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
231 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
232 | { "net_broadcast", CAP_NET_BROADCAST }, | |
233 | { "net_admin", CAP_NET_ADMIN }, | |
234 | { "net_raw", CAP_NET_RAW }, | |
235 | { "ipc_lock", CAP_IPC_LOCK }, | |
236 | { "ipc_owner", CAP_IPC_OWNER }, | |
237 | { "sys_module", CAP_SYS_MODULE }, | |
238 | { "sys_rawio", CAP_SYS_RAWIO }, | |
239 | { "sys_chroot", CAP_SYS_CHROOT }, | |
240 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
241 | { "sys_pacct", CAP_SYS_PACCT }, | |
242 | { "sys_admin", CAP_SYS_ADMIN }, | |
243 | { "sys_boot", CAP_SYS_BOOT }, | |
244 | { "sys_nice", CAP_SYS_NICE }, | |
245 | { "sys_resource", CAP_SYS_RESOURCE }, | |
246 | { "sys_time", CAP_SYS_TIME }, | |
247 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
248 | { "mknod", CAP_MKNOD }, | |
249 | { "lease", CAP_LEASE }, | |
57b837e2 | 250 | #ifdef CAP_AUDIT_READ |
0fd73091 | 251 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 252 | #endif |
9527e566 | 253 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 254 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
255 | #endif |
256 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 257 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 258 | #endif |
0fd73091 CB |
259 | { "setfcap", CAP_SETFCAP }, |
260 | { "mac_override", CAP_MAC_OVERRIDE }, | |
261 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 262 | #ifdef CAP_SYSLOG |
0fd73091 | 263 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
264 | #endif |
265 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 266 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 267 | #endif |
2b54359b | 268 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 269 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 270 | #endif |
495d2046 | 271 | #endif |
8560cd36 | 272 | }; |
81810dd1 | 273 | |
c6d09e15 WB |
274 | static struct limit_opt limit_opt[] = { |
275 | #ifdef RLIMIT_AS | |
276 | { "as", RLIMIT_AS }, | |
277 | #endif | |
278 | #ifdef RLIMIT_CORE | |
279 | { "core", RLIMIT_CORE }, | |
280 | #endif | |
281 | #ifdef RLIMIT_CPU | |
282 | { "cpu", RLIMIT_CPU }, | |
283 | #endif | |
284 | #ifdef RLIMIT_DATA | |
285 | { "data", RLIMIT_DATA }, | |
286 | #endif | |
287 | #ifdef RLIMIT_FSIZE | |
288 | { "fsize", RLIMIT_FSIZE }, | |
289 | #endif | |
290 | #ifdef RLIMIT_LOCKS | |
291 | { "locks", RLIMIT_LOCKS }, | |
292 | #endif | |
293 | #ifdef RLIMIT_MEMLOCK | |
294 | { "memlock", RLIMIT_MEMLOCK }, | |
295 | #endif | |
296 | #ifdef RLIMIT_MSGQUEUE | |
297 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
298 | #endif | |
299 | #ifdef RLIMIT_NICE | |
300 | { "nice", RLIMIT_NICE }, | |
301 | #endif | |
302 | #ifdef RLIMIT_NOFILE | |
303 | { "nofile", RLIMIT_NOFILE }, | |
304 | #endif | |
305 | #ifdef RLIMIT_NPROC | |
306 | { "nproc", RLIMIT_NPROC }, | |
307 | #endif | |
308 | #ifdef RLIMIT_RSS | |
309 | { "rss", RLIMIT_RSS }, | |
310 | #endif | |
311 | #ifdef RLIMIT_RTPRIO | |
312 | { "rtprio", RLIMIT_RTPRIO }, | |
313 | #endif | |
314 | #ifdef RLIMIT_RTTIME | |
315 | { "rttime", RLIMIT_RTTIME }, | |
316 | #endif | |
317 | #ifdef RLIMIT_SIGPENDING | |
318 | { "sigpending", RLIMIT_SIGPENDING }, | |
319 | #endif | |
320 | #ifdef RLIMIT_STACK | |
321 | { "stack", RLIMIT_STACK }, | |
322 | #endif | |
323 | }; | |
324 | ||
91c3830e SH |
325 | static int run_buffer(char *buffer) |
326 | { | |
8e7da691 | 327 | int ret; |
0fd73091 CB |
328 | char *output; |
329 | struct lxc_popen_FILE *f; | |
91c3830e | 330 | |
ebec9176 | 331 | f = lxc_popen(buffer); |
91c3830e | 332 | if (!f) { |
3f60c2f7 | 333 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
334 | return -1; |
335 | } | |
336 | ||
337 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
338 | if (!output) { | |
3f60c2f7 | 339 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 340 | lxc_pclose(f); |
91c3830e SH |
341 | return -1; |
342 | } | |
343 | ||
062b72c6 | 344 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 345 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e SH |
346 | |
347 | free(output); | |
348 | ||
ebec9176 | 349 | ret = lxc_pclose(f); |
8e7da691 | 350 | if (ret == -1) { |
3f60c2f7 | 351 | SYSERROR("Script exited with error"); |
91c3830e | 352 | return -1; |
8e7da691 | 353 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 354 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
355 | return -1; |
356 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 357 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 358 | return -1; |
91c3830e SH |
359 | } |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
14a7b0f9 CB |
364 | int run_script_argv(const char *name, unsigned int hook_version, |
365 | const char *section, const char *script, | |
586b1ce7 | 366 | const char *hookname, char **argv) |
148e91f5 | 367 | { |
3f60c2f7 | 368 | int buf_pos, i, ret; |
148e91f5 | 369 | char *buffer; |
6f8d00d2 | 370 | int fret = -1; |
d08e5708 | 371 | size_t size = 0; |
148e91f5 | 372 | |
3f60c2f7 CB |
373 | if (hook_version == 0) |
374 | INFO("Executing script \"%s\" for container \"%s\", config " | |
375 | "section \"%s\"", script, name, section); | |
376 | else | |
377 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 378 | |
586b1ce7 CB |
379 | for (i = 0; argv && argv[i]; i++) |
380 | size += strlen(argv[i]) + 1; | |
148e91f5 | 381 | |
3f60c2f7 | 382 | size += sizeof("exec"); |
148e91f5 | 383 | size += strlen(script); |
3f60c2f7 CB |
384 | size++; |
385 | ||
148e91f5 | 386 | if (size > INT_MAX) |
3f60c2f7 | 387 | return -EFBIG; |
148e91f5 | 388 | |
3f60c2f7 | 389 | if (hook_version == 0) { |
d08e5708 CB |
390 | size += strlen(hookname); |
391 | size++; | |
392 | ||
393 | size += strlen(name); | |
394 | size++; | |
395 | ||
396 | size += strlen(section); | |
397 | size++; | |
398 | ||
399 | if (size > INT_MAX) | |
400 | return -EFBIG; | |
327cce76 | 401 | } |
3f60c2f7 | 402 | |
6f8d00d2 CB |
403 | buffer = malloc(size); |
404 | if (!buffer) | |
405 | return -ENOMEM; | |
406 | ||
327cce76 | 407 | if (hook_version == 0) |
3f60c2f7 | 408 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 409 | else |
3f60c2f7 | 410 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
411 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
412 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 413 | goto on_error; |
327cce76 | 414 | } |
3f60c2f7 | 415 | |
327cce76 | 416 | if (hook_version == 1) { |
3f60c2f7 CB |
417 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
418 | if (ret < 0) { | |
419 | SYSERROR("Failed to set environment variable: " | |
420 | "LXC_HOOK_TYPE=%s", hookname); | |
6f8d00d2 | 421 | goto on_error; |
3f60c2f7 | 422 | } |
90f20466 | 423 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
424 | |
425 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
426 | if (ret < 0) { | |
427 | SYSERROR("Failed to set environment variable: " | |
428 | "LXC_HOOK_SECTION=%s", section); | |
6f8d00d2 | 429 | goto on_error; |
3f60c2f7 CB |
430 | } |
431 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
432 | |
433 | if (strcmp(section, "net") == 0) { | |
434 | char *parent; | |
435 | ||
586b1ce7 | 436 | if (!argv || !argv[0]) |
6f8d00d2 | 437 | goto on_error; |
14a7b0f9 | 438 | |
586b1ce7 | 439 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
440 | if (ret < 0) { |
441 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 442 | "LXC_NET_TYPE=%s", argv[0]); |
6f8d00d2 | 443 | goto on_error; |
14a7b0f9 | 444 | } |
586b1ce7 | 445 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 446 | |
586b1ce7 | 447 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 448 | |
a8144263 | 449 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
450 | ret = setenv("LXC_NET_PARENT", parent, 1); |
451 | if (ret < 0) { | |
452 | SYSERROR("Failed to set environment " | |
453 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 454 | goto on_error; |
14a7b0f9 CB |
455 | } |
456 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 457 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
458 | ret = setenv("LXC_NET_PARENT", parent, 1); |
459 | if (ret < 0) { | |
460 | SYSERROR("Failed to set environment " | |
461 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 462 | goto on_error; |
14a7b0f9 CB |
463 | } |
464 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 465 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 466 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
467 | |
468 | ret = setenv("LXC_NET_PEER", peer, 1); | |
469 | if (ret < 0) { | |
470 | SYSERROR("Failed to set environment " | |
471 | "variable: LXC_NET_PEER=%s", peer); | |
6f8d00d2 | 472 | goto on_error; |
14a7b0f9 CB |
473 | } |
474 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
475 | ||
476 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
477 | if (ret < 0) { | |
478 | SYSERROR("Failed to set environment " | |
479 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 480 | goto on_error; |
14a7b0f9 CB |
481 | } |
482 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
483 | } | |
484 | } | |
148e91f5 SH |
485 | } |
486 | ||
586b1ce7 | 487 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
488 | size_t len = size - buf_pos; |
489 | ||
586b1ce7 | 490 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
491 | if (ret < 0 || (size_t)ret >= len) { |
492 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 493 | goto on_error; |
148e91f5 | 494 | } |
3f60c2f7 | 495 | buf_pos += ret; |
148e91f5 SH |
496 | } |
497 | ||
6f8d00d2 CB |
498 | fret = run_buffer(buffer); |
499 | ||
500 | on_error: | |
501 | free(buffer); | |
502 | return fret; | |
148e91f5 SH |
503 | } |
504 | ||
811ef482 | 505 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 506 | { |
abbfd20b | 507 | int ret; |
91c3830e | 508 | char *buffer, *p; |
abbfd20b | 509 | va_list ap; |
0fd73091 | 510 | size_t size = 0; |
751d9dcd | 511 | |
0fd73091 | 512 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 513 | script, name, section); |
e3b4c4c4 | 514 | |
abbfd20b DL |
515 | va_start(ap, script); |
516 | while ((p = va_arg(ap, char *))) | |
95642a10 | 517 | size += strlen(p) + 1; |
abbfd20b DL |
518 | va_end(ap); |
519 | ||
6d1a5f93 | 520 | size += strlen("exec"); |
abbfd20b DL |
521 | size += strlen(script); |
522 | size += strlen(name); | |
523 | size += strlen(section); | |
6d1a5f93 | 524 | size += 4; |
abbfd20b | 525 | |
95642a10 MS |
526 | if (size > INT_MAX) |
527 | return -1; | |
528 | ||
529 | buffer = alloca(size); | |
6d1a5f93 | 530 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 531 | if (ret < 0 || ret >= size) |
9ba8130c | 532 | return -1; |
751d9dcd | 533 | |
abbfd20b | 534 | va_start(ap, script); |
9ba8130c | 535 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 536 | int len = size - ret; |
9ba8130c SH |
537 | int rc; |
538 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
539 | if (rc < 0 || rc >= len) { |
540 | va_end(ap); | |
9ba8130c | 541 | return -1; |
7b5a2435 | 542 | } |
9ba8130c SH |
543 | ret += rc; |
544 | } | |
abbfd20b | 545 | va_end(ap); |
751d9dcd | 546 | |
91c3830e | 547 | return run_buffer(buffer); |
e3b4c4c4 ST |
548 | } |
549 | ||
0fd73091 | 550 | /* pin_rootfs |
63fc76c3 | 551 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
552 | * the duration of the container run, to prevent the container from marking |
553 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
554 | * no name pollution is happens. |
555 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
556 | * return -1 on error. |
557 | * return -2 if nothing needed to be pinned. | |
558 | * return an open fd (>=0) if we pinned it. | |
559 | */ | |
560 | int pin_rootfs(const char *rootfs) | |
561 | { | |
0fd73091 CB |
562 | int fd, ret; |
563 | char absrootfs[MAXPATHLEN], absrootfspin[MAXPATHLEN]; | |
0c547523 | 564 | struct stat s; |
63fc76c3 | 565 | struct statfs sfs; |
0c547523 | 566 | |
e99ee0de | 567 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 568 | return -2; |
e99ee0de | 569 | |
00ec333b | 570 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 571 | return -2; |
0c547523 | 572 | |
0fd73091 CB |
573 | ret = stat(absrootfs, &s); |
574 | if (ret < 0) | |
0c547523 | 575 | return -1; |
0c547523 | 576 | |
72f919c4 | 577 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
578 | return -2; |
579 | ||
63fc76c3 | 580 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/.lxc-keep", absrootfs); |
00ec333b | 581 | if (ret >= MAXPATHLEN) |
0c547523 | 582 | return -1; |
0c547523 | 583 | |
0fd73091 | 584 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
585 | if (fd < 0) |
586 | return fd; | |
0fd73091 | 587 | |
205fc010 CB |
588 | ret = fstatfs (fd, &sfs); |
589 | if (ret < 0) | |
590 | return fd; | |
63fc76c3 GJ |
591 | |
592 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 593 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
594 | return fd; |
595 | } | |
596 | ||
b7ed4bf0 | 597 | (void)unlink(absrootfspin); |
0fd73091 | 598 | |
0c547523 SH |
599 | return fd; |
600 | } | |
601 | ||
0fd73091 CB |
602 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
603 | * honored. | |
e2a7e8dc | 604 | */ |
5ae72b98 | 605 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 606 | unsigned long flags) |
e2a7e8dc | 607 | { |
614305f3 | 608 | #ifdef HAVE_STATVFS |
0fd73091 | 609 | int ret; |
e2a7e8dc SH |
610 | struct statvfs sb; |
611 | unsigned long required_flags = 0; | |
612 | ||
e2a7e8dc SH |
613 | if (!s) |
614 | s = d; | |
615 | ||
616 | if (!s) | |
617 | return flags; | |
0fd73091 CB |
618 | |
619 | ret = statvfs(s, &sb); | |
620 | if (ret < 0) | |
e2a7e8dc SH |
621 | return flags; |
622 | ||
69eadddb CB |
623 | if (flags & MS_REMOUNT) { |
624 | if (sb.f_flag & MS_NOSUID) | |
625 | required_flags |= MS_NOSUID; | |
626 | if (sb.f_flag & MS_NODEV) | |
627 | required_flags |= MS_NODEV; | |
628 | if (sb.f_flag & MS_RDONLY) | |
629 | required_flags |= MS_RDONLY; | |
630 | if (sb.f_flag & MS_NOEXEC) | |
631 | required_flags |= MS_NOEXEC; | |
632 | } | |
633 | ||
634 | if (sb.f_flag & MS_NOATIME) | |
635 | required_flags |= MS_NOATIME; | |
636 | if (sb.f_flag & MS_NODIRATIME) | |
637 | required_flags |= MS_NODIRATIME; | |
638 | if (sb.f_flag & MS_LAZYTIME) | |
639 | required_flags |= MS_LAZYTIME; | |
640 | if (sb.f_flag & MS_RELATIME) | |
641 | required_flags |= MS_RELATIME; | |
642 | if (sb.f_flag & MS_STRICTATIME) | |
643 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
644 | |
645 | return flags | required_flags; | |
614305f3 SH |
646 | #else |
647 | return flags; | |
648 | #endif | |
e2a7e8dc SH |
649 | } |
650 | ||
0d190408 LT |
651 | static int add_shmount_to_list(struct lxc_conf *conf) { |
652 | char new_mount[MAXPATHLEN]; | |
653 | size_t len_mount; | |
654 | /* Offset for the leading '/' since the path_cont | |
655 | * is absolute inside the container */ | |
656 | int ret = -1, offset = 1; | |
657 | ||
658 | /* +1 for the separating whitespace */ | |
659 | len_mount = strlen(conf->lxc_shmount.path_host) + 1 | |
660 | + strlen(conf->lxc_shmount.path_cont) - offset | |
661 | + sizeof(" none bind,create=dir 0 0") - 1; | |
662 | ||
663 | ret = snprintf(new_mount, len_mount + 1, "%s %s none bind,create=dir 0 0", | |
664 | conf->lxc_shmount.path_host, conf->lxc_shmount.path_cont + offset); | |
665 | if (ret < 0 || (size_t)ret >= len_mount + 1) | |
666 | return -1; | |
667 | ||
668 | ret = add_elem_to_mount_list(new_mount, conf); | |
669 | if (ret < 0) | |
670 | ERROR("Failed to add new mount \"%s\" to the config", new_mount); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
4fb3cba5 | 675 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 676 | { |
0fd73091 | 677 | int i, r; |
b06b8511 CS |
678 | static struct { |
679 | int match_mask; | |
680 | int match_flag; | |
681 | const char *source; | |
682 | const char *destination; | |
683 | const char *fstype; | |
684 | unsigned long flags; | |
685 | const char *options; | |
686 | } default_mounts[] = { | |
0fd73091 CB |
687 | /* Read-only bind-mounting... In older kernels, doing that |
688 | * required to do one MS_BIND mount and then | |
689 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
690 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
691 | * onwards. However, this apparently does not work on kernel | |
692 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
693 | * trick as above doesn't seem to work either, there one needs | |
694 | * to ALSO specify MS_BIND for the remount, otherwise the | |
695 | * entire fs is remounted read-only or the mount fails because | |
696 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
697 | * kernels as low as 2.6.32... | |
368bbc02 | 698 | */ |
0fd73091 | 699 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 700 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
701 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
702 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
703 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
704 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
705 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
706 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
707 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
708 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
709 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
710 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
711 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
712 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
713 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
714 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL }, | |
715 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_BIND|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL }, | |
716 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 717 | }; |
368bbc02 | 718 | |
b06b8511 | 719 | for (i = 0; default_mounts[i].match_mask; i++) { |
0fd73091 CB |
720 | int saved_errno; |
721 | unsigned long mflags; | |
722 | char *destination = NULL; | |
723 | char *source = NULL; | |
724 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) | |
725 | continue; | |
726 | ||
727 | if (default_mounts[i].source) { | |
cc4fd506 | 728 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
729 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
730 | if (!source) | |
cc4fd506 | 731 | return -1; |
0fd73091 | 732 | } |
f24a52d5 | 733 | |
0fd73091 CB |
734 | if (!default_mounts[i].destination) { |
735 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b06b8511 | 736 | free(source); |
0fd73091 CB |
737 | return -1; |
738 | } | |
739 | ||
740 | /* will act like strdup if %r is not present */ | |
741 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
742 | if (!destination) { | |
743 | saved_errno = errno; | |
744 | free(source); | |
745 | errno = saved_errno; | |
746 | return -1; | |
747 | } | |
748 | ||
749 | mflags = add_required_remount_flags(source, destination, | |
750 | default_mounts[i].flags); | |
751 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
752 | mflags, default_mounts[i].options, | |
753 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
754 | saved_errno = errno; | |
755 | if (r < 0 && errno == ENOENT) { | |
756 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
757 | "not exist. Skipping", source, destination); | |
758 | r = 0; | |
759 | } else if (r < 0) { | |
760 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
761 | } | |
762 | ||
763 | free(source); | |
764 | free(destination); | |
765 | if (r < 0) { | |
766 | errno = saved_errno; | |
767 | return -1; | |
368bbc02 | 768 | } |
368bbc02 CS |
769 | } |
770 | ||
b06b8511 | 771 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
772 | int cg_flags; |
773 | ||
3f69fb12 | 774 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
775 | /* If the type of cgroup mount was not specified, it depends on |
776 | * the container's capabilities as to what makes sense: if we | |
777 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
778 | * read-write anyway, so we may as well default to read-write; | |
779 | * then the admin will not be given a false sense of security. | |
780 | * (And if they really want mixed r/o r/w, then they can | |
781 | * explicitly specify :mixed.) OTOH, if the container lacks | |
782 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
783 | * container can't remount it read-write. | |
784 | */ | |
0769b82a CS |
785 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
786 | int has_sys_admin = 0; | |
b0ee5983 CB |
787 | |
788 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 789 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 790 | else |
0769b82a | 791 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
792 | |
793 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 794 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 795 | else |
0769b82a | 796 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 797 | } |
0fd73091 | 798 | |
3f69fb12 | 799 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
800 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
801 | ||
2202afc9 CB |
802 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
803 | handler, | |
804 | conf->rootfs.path ? conf->rootfs.mount : "", | |
805 | cg_flags)) { | |
0fd73091 | 806 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 807 | return -1; |
368bbc02 CS |
808 | } |
809 | } | |
810 | ||
0d190408 LT |
811 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
812 | int ret = add_shmount_to_list(conf); | |
813 | if (ret < 0) { | |
814 | ERROR("Failed to add shmount entry to container config"); | |
815 | return ret; | |
816 | } | |
817 | } | |
818 | ||
368bbc02 | 819 | return 0; |
368bbc02 CS |
820 | } |
821 | ||
4e5440c6 | 822 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 823 | { |
0fd73091 CB |
824 | int ret; |
825 | ||
4e5440c6 DL |
826 | if (!utsname) |
827 | return 0; | |
0ad19a3f | 828 | |
0fd73091 CB |
829 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
830 | if (ret < 0) { | |
831 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 832 | return -1; |
833 | } | |
834 | ||
0fd73091 | 835 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 836 | |
0ad19a3f | 837 | return 0; |
838 | } | |
839 | ||
69aa6655 DE |
840 | struct dev_symlinks { |
841 | const char *oldpath; | |
842 | const char *name; | |
843 | }; | |
844 | ||
845 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
846 | { "/proc/self/fd", "fd" }, |
847 | { "/proc/self/fd/0", "stdin" }, | |
848 | { "/proc/self/fd/1", "stdout" }, | |
849 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
850 | }; |
851 | ||
ed8704d0 | 852 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 853 | { |
0fd73091 | 854 | int i, ret; |
69aa6655 | 855 | char path[MAXPATHLEN]; |
09227be2 | 856 | struct stat s; |
69aa6655 | 857 | |
69aa6655 DE |
858 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
859 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
860 | |
861 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
862 | rootfs->path ? rootfs->mount : "", d->name); | |
69aa6655 DE |
863 | if (ret < 0 || ret >= MAXPATHLEN) |
864 | return -1; | |
09227be2 | 865 | |
0fd73091 CB |
866 | /* Stat the path first. If we don't get an error accept it as |
867 | * is and don't try to create it | |
09227be2 | 868 | */ |
0fd73091 CB |
869 | ret = stat(path, &s); |
870 | if (ret == 0) | |
09227be2 | 871 | continue; |
09227be2 | 872 | |
69aa6655 DE |
873 | ret = symlink(d->oldpath, path); |
874 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
875 | if (errno == EROFS) { |
876 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 877 | } else { |
0fd73091 | 878 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
879 | return -1; |
880 | } | |
69aa6655 DE |
881 | } |
882 | } | |
0fd73091 | 883 | |
69aa6655 DE |
884 | return 0; |
885 | } | |
886 | ||
2187efd3 | 887 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 888 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 889 | { |
393903d1 | 890 | char *p; |
f1e05b90 | 891 | size_t size; |
393903d1 SH |
892 | |
893 | if (!*pp) { | |
894 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
895 | if (!*pp) | |
896 | return false; | |
0fd73091 | 897 | |
393903d1 SH |
898 | sprintf(*pp, "container_ttys=%s", name); |
899 | return true; | |
900 | } | |
0fd73091 | 901 | |
f1e05b90 DJ |
902 | size = strlen(*pp) + strlen(name) + 2; |
903 | p = realloc(*pp, size); | |
393903d1 SH |
904 | if (!p) |
905 | return false; | |
0fd73091 | 906 | |
393903d1 | 907 | *pp = p; |
f1e05b90 DJ |
908 | (void)strlcat(p, " ", size); |
909 | (void)strlcat(p, name, size); | |
0fd73091 | 910 | |
393903d1 SH |
911 | return true; |
912 | } | |
913 | ||
2187efd3 | 914 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 915 | { |
9e1045e3 | 916 | int i, ret; |
0e4be3cf | 917 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 918 | char *ttydir = ttys->dir; |
7c6ef2a2 | 919 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 920 | |
e8bd4e43 | 921 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
922 | return 0; |
923 | ||
885766f5 | 924 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 925 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 926 | |
e8bd4e43 | 927 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 928 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 929 | return -1; |
9e1045e3 | 930 | |
7c6ef2a2 SH |
931 | if (ttydir) { |
932 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
933 | ret = snprintf(lxcpath, sizeof(lxcpath), |
934 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 935 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 936 | return -1; |
9e1045e3 | 937 | |
3b7e332f | 938 | ret = mknod(path, S_IFREG | 0000, 0); |
9e1045e3 | 939 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 940 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
941 | return -1; |
942 | } | |
9e1045e3 | 943 | |
7c6ef2a2 | 944 | ret = unlink(path); |
9e1045e3 | 945 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 946 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
947 | return -1; |
948 | } | |
b0a33c1e | 949 | |
2520facd | 950 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 951 | if (ret < 0) { |
73363c61 | 952 | WARN("Failed to bind mount \"%s\" onto \"%s\"", |
2520facd | 953 | tty->name, path); |
7c6ef2a2 SH |
954 | continue; |
955 | } | |
0fd73091 | 956 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 957 | path); |
13954cce | 958 | |
9e1045e3 CB |
959 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
960 | ttydir, i + 1); | |
73363c61 | 961 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 962 | return -1; |
9e1045e3 | 963 | |
7c6ef2a2 | 964 | ret = symlink(lxcpath, path); |
9e1045e3 | 965 | if (ret < 0) { |
73363c61 | 966 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 967 | path, lxcpath); |
7c6ef2a2 SH |
968 | return -1; |
969 | } | |
970 | } else { | |
9e1045e3 CB |
971 | /* If we populated /dev, then we need to create |
972 | * /dev/ttyN | |
973 | */ | |
d3ccc04e CB |
974 | ret = mknod(path, S_IFREG | 0000, 0); |
975 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 976 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 977 | |
2520facd | 978 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 979 | if (ret < 0) { |
2520facd | 980 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
981 | continue; |
982 | } | |
9e1045e3 | 983 | |
d3ccc04e | 984 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 985 | } |
9e1045e3 | 986 | |
885766f5 | 987 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
988 | ERROR("Error setting up container_ttys string"); |
989 | return -1; | |
b0a33c1e | 990 | } |
991 | } | |
992 | ||
885766f5 | 993 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 994 | return 0; |
995 | } | |
996 | ||
663014ee | 997 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 998 | { |
2187efd3 | 999 | int i, ret; |
0fd73091 | 1000 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
1001 | |
1002 | /* no tty in the configuration */ | |
885766f5 | 1003 | if (ttys->max == 0) |
2187efd3 CB |
1004 | return 0; |
1005 | ||
885766f5 | 1006 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 1007 | if (!ttys->tty) |
2187efd3 | 1008 | return -ENOMEM; |
2187efd3 | 1009 | |
885766f5 | 1010 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1011 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1012 | |
386e6768 CB |
1013 | tty->master = -EBADF; |
1014 | tty->slave = -EBADF; | |
77a39805 CB |
1015 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
1016 | if (ret < 0) { | |
0fd73091 | 1017 | SYSERROR("Failed to create tty %d", i); |
885766f5 | 1018 | ttys->max = i; |
0e4be3cf | 1019 | lxc_delete_tty(ttys); |
2187efd3 CB |
1020 | return -ENOTTY; |
1021 | } | |
1022 | ||
77a39805 CB |
1023 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
1024 | if (ret < 0) { | |
1025 | SYSERROR("Failed to retrieve name of tty %d slave", i); | |
1026 | ttys->max = i; | |
1027 | lxc_delete_tty(ttys); | |
1028 | return -ENOTTY; | |
1029 | } | |
1030 | ||
0fd73091 | 1031 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 1032 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
1033 | |
1034 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 1035 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1036 | if (ret < 0) |
a24c5678 | 1037 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1038 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1039 | |
615f24ff | 1040 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1041 | if (ret < 0) |
a24c5678 | 1042 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1043 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1044 | |
2520facd | 1045 | tty->busy = 0; |
2187efd3 CB |
1046 | } |
1047 | ||
885766f5 | 1048 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1049 | return 0; |
1050 | } | |
1051 | ||
0e4be3cf | 1052 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1053 | { |
1054 | int i; | |
1055 | ||
386e6768 CB |
1056 | if (!ttys->tty) |
1057 | return; | |
1058 | ||
885766f5 | 1059 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1060 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1061 | |
386e6768 CB |
1062 | if (tty->master >= 0) { |
1063 | close(tty->master); | |
1064 | tty->master = -EBADF; | |
1065 | } | |
1066 | ||
1067 | if (tty->slave >= 0) { | |
1068 | close(tty->slave); | |
1069 | tty->slave = -EBADF; | |
1070 | } | |
2187efd3 CB |
1071 | } |
1072 | ||
0e4be3cf CB |
1073 | free(ttys->tty); |
1074 | ttys->tty = NULL; | |
2187efd3 CB |
1075 | } |
1076 | ||
1077 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1078 | { | |
1079 | int i; | |
0fd73091 | 1080 | int ret = -1; |
2187efd3 | 1081 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1082 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1083 | int sock = handler->data_sock[0]; |
2187efd3 | 1084 | |
885766f5 | 1085 | if (ttys->max == 0) |
2187efd3 CB |
1086 | return 0; |
1087 | ||
885766f5 | 1088 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1089 | int ttyfds[2]; |
0e4be3cf | 1090 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1091 | |
2520facd CB |
1092 | ttyfds[0] = tty->master; |
1093 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1094 | |
1095 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1096 | if (ret < 0) | |
1097 | break; | |
1098 | ||
0fd73091 | 1099 | TRACE("Sent ty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1100 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1101 | } |
1102 | ||
1103 | if (ret < 0) | |
6d1400b5 | 1104 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1105 | else |
885766f5 | 1106 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1107 | |
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1112 | { | |
1113 | int ret = -1; | |
1114 | struct lxc_conf *conf = handler->conf; | |
1115 | ||
663014ee | 1116 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1117 | if (ret < 0) { |
1118 | ERROR("Failed to allocate ttys"); | |
1119 | goto on_error; | |
1120 | } | |
1121 | ||
1122 | ret = lxc_send_ttys_to_parent(handler); | |
1123 | if (ret < 0) { | |
1124 | ERROR("Failed to send ttys to parent"); | |
1125 | goto on_error; | |
1126 | } | |
1127 | ||
1128 | if (!conf->is_execute) { | |
1129 | ret = lxc_setup_ttys(conf); | |
1130 | if (ret < 0) { | |
1131 | ERROR("Failed to setup ttys"); | |
1132 | goto on_error; | |
1133 | } | |
1134 | } | |
1135 | ||
885766f5 CB |
1136 | if (conf->ttys.tty_names) { |
1137 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1138 | if (ret < 0) |
885766f5 | 1139 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1140 | } |
1141 | ||
1142 | ret = 0; | |
1143 | ||
1144 | on_error: | |
0e4be3cf | 1145 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1146 | |
1147 | return ret; | |
1148 | } | |
1149 | ||
59bb8698 | 1150 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 1151 | { |
0fd73091 CB |
1152 | int ret; |
1153 | int newroot = -1, oldroot = -1; | |
bf601689 | 1154 | |
2d489f9e SH |
1155 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1156 | if (oldroot < 0) { | |
0fd73091 | 1157 | SYSERROR("Failed to open old root directory"); |
9ba8130c SH |
1158 | return -1; |
1159 | } | |
0fd73091 | 1160 | |
2d489f9e SH |
1161 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1162 | if (newroot < 0) { | |
0fd73091 CB |
1163 | SYSERROR("Failed to open new root directory"); |
1164 | goto on_error; | |
c08556c6 | 1165 | } |
bf601689 | 1166 | |
cc6f6dd7 | 1167 | /* change into new root fs */ |
0fd73091 CB |
1168 | ret = fchdir(newroot); |
1169 | if (ret < 0) { | |
1170 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1171 | goto on_error; | |
cc6f6dd7 DL |
1172 | } |
1173 | ||
cc6f6dd7 | 1174 | /* pivot_root into our new root fs */ |
0fd73091 CB |
1175 | ret = pivot_root(".", "."); |
1176 | if (ret < 0) { | |
1177 | SYSERROR("Failed to pivot_root()"); | |
1178 | goto on_error; | |
bf601689 | 1179 | } |
cc6f6dd7 | 1180 | |
e599717b | 1181 | /* At this point the old-root is mounted on top of our new-root. To |
0fd73091 CB |
1182 | * unmounted it we must not be chdir'd into it, so escape back to |
1183 | * old-root. | |
2d489f9e | 1184 | */ |
0fd73091 CB |
1185 | ret = fchdir(oldroot); |
1186 | if (ret < 0) { | |
1187 | SYSERROR("Failed to enter old root directory"); | |
1188 | goto on_error; | |
2d489f9e | 1189 | } |
0fd73091 | 1190 | |
e599717b FW |
1191 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1192 | * host. | |
1193 | */ | |
1194 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1195 | if (ret < 0) { | |
1196 | SYSERROR("Failed to make oldroot rslave"); | |
1197 | goto on_error; | |
1198 | } | |
1199 | ||
0fd73091 CB |
1200 | ret = umount2(".", MNT_DETACH); |
1201 | if (ret < 0) { | |
1202 | SYSERROR("Failed to detach old root directory"); | |
1203 | goto on_error; | |
cc6f6dd7 DL |
1204 | } |
1205 | ||
0fd73091 CB |
1206 | ret = fchdir(newroot); |
1207 | if (ret < 0) { | |
1208 | SYSERROR("Failed to re-enter new root directory"); | |
1209 | goto on_error; | |
2d489f9e | 1210 | } |
cc6f6dd7 | 1211 | |
2d489f9e SH |
1212 | close(oldroot); |
1213 | close(newroot); | |
bf601689 | 1214 | |
0fd73091 | 1215 | DEBUG("pivot_root(\"%s\") successful", rootfs); |
bf601689 | 1216 | |
bf601689 | 1217 | return 0; |
2d489f9e | 1218 | |
0fd73091 | 1219 | on_error: |
2d489f9e SH |
1220 | if (oldroot != -1) |
1221 | close(oldroot); | |
1222 | if (newroot != -1) | |
1223 | close(newroot); | |
0fd73091 | 1224 | |
2d489f9e | 1225 | return -1; |
bf601689 MH |
1226 | } |
1227 | ||
7133b912 CB |
1228 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1229 | * error, log it but don't fail yet. | |
91c3830e | 1230 | */ |
7133b912 CB |
1231 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1232 | const char *lxcpath) | |
91c3830e SH |
1233 | { |
1234 | int ret; | |
87da4ec3 SH |
1235 | size_t clen; |
1236 | char *path; | |
87e0e273 | 1237 | mode_t cur_mask; |
91c3830e | 1238 | |
7133b912 | 1239 | INFO("Preparing \"/dev\""); |
bc6928ff | 1240 | |
14221cbb | 1241 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1242 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1243 | path = alloca(clen); |
bc6928ff | 1244 | |
ec50007f | 1245 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1246 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1247 | return -1; |
bc6928ff | 1248 | |
87e0e273 CB |
1249 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1250 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1251 | if (ret < 0 && errno != EEXIST) { | |
1252 | SYSERROR("Failed to create \"/dev\" directory"); | |
1253 | ret = -errno; | |
1254 | goto reset_umask; | |
bc6928ff | 1255 | } |
87da4ec3 | 1256 | |
1ec0e8e3 | 1257 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1258 | rootfs->path ? rootfs->mount : NULL); |
1259 | if (ret < 0) { | |
1260 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1261 | goto reset_umask; |
91c3830e | 1262 | } |
87e0e273 | 1263 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1264 | |
ec50007f | 1265 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1266 | if (ret < 0 || (size_t)ret >= clen) { |
1267 | ret = -1; | |
1268 | goto reset_umask; | |
1269 | } | |
87da4ec3 | 1270 | |
7133b912 | 1271 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1272 | * If not, then create it and exit if that fails... |
1273 | */ | |
87e0e273 CB |
1274 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1275 | if (ret < 0 && errno != EEXIST) { | |
1276 | SYSERROR("Failed to create directory \"%s\"", path); | |
1277 | ret = -errno; | |
1278 | goto reset_umask; | |
91c3830e SH |
1279 | } |
1280 | ||
87e0e273 CB |
1281 | ret = 0; |
1282 | ||
1283 | reset_umask: | |
1284 | (void)umask(cur_mask); | |
1285 | ||
7133b912 | 1286 | INFO("Prepared \"/dev\""); |
87e0e273 | 1287 | return ret; |
91c3830e SH |
1288 | } |
1289 | ||
5e73416f | 1290 | struct lxc_device_node { |
74a3920a | 1291 | const char *name; |
5e73416f CB |
1292 | const mode_t mode; |
1293 | const int maj; | |
1294 | const int min; | |
c6883f38 SH |
1295 | }; |
1296 | ||
5e73416f | 1297 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1298 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1299 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1300 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1301 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1302 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1303 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1304 | }; |
1305 | ||
5067e4dd CB |
1306 | |
1307 | enum { | |
1308 | LXC_DEVNODE_BIND, | |
1309 | LXC_DEVNODE_MKNOD, | |
1310 | LXC_DEVNODE_PARTIAL, | |
1311 | LXC_DEVNODE_OPEN, | |
1312 | }; | |
1313 | ||
27245ff7 | 1314 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1315 | { |
5e73416f | 1316 | int i, ret; |
c6883f38 | 1317 | char path[MAXPATHLEN]; |
3a32201c | 1318 | mode_t cmask; |
5067e4dd | 1319 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1320 | |
3999be0a CB |
1321 | ret = snprintf(path, MAXPATHLEN, "%s/dev", |
1322 | rootfs->path ? rootfs->mount : ""); | |
1323 | if (ret < 0 || ret >= MAXPATHLEN) | |
c6883f38 | 1324 | return -1; |
91c3830e | 1325 | |
0bbf8572 CB |
1326 | /* ignore, just don't try to fill in */ |
1327 | if (!dir_exists(path)) | |
9cb4d183 SH |
1328 | return 0; |
1329 | ||
3999be0a CB |
1330 | INFO("Populating \"/dev\""); |
1331 | ||
3a32201c | 1332 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f CB |
1333 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
1334 | char hostpath[MAXPATHLEN]; | |
1335 | const struct lxc_device_node *device = &lxc_devices[i]; | |
0728ebf4 | 1336 | |
3999be0a | 1337 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", |
5e73416f | 1338 | rootfs->path ? rootfs->mount : "", device->name); |
c6883f38 SH |
1339 | if (ret < 0 || ret >= MAXPATHLEN) |
1340 | return -1; | |
0bbf8572 | 1341 | |
5067e4dd | 1342 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1343 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1344 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1345 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1346 | } else if (ret < 0) { |
1347 | if (errno != EPERM) { | |
1348 | SYSERROR("Failed to create device node \"%s\"", path); | |
1349 | return -1; | |
1350 | } | |
0bbf8572 | 1351 | |
5067e4dd | 1352 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1353 | } |
3999be0a | 1354 | |
5067e4dd CB |
1355 | /* Device nodes are fully useable. */ |
1356 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1357 | continue; | |
1358 | ||
1359 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1360 | /* See | |
1361 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1362 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1363 | */ | |
1364 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1365 | if (ret >= 0) { | |
1366 | close(ret); | |
1367 | /* Device nodes are fully useable. */ | |
1368 | use_mknod = LXC_DEVNODE_OPEN; | |
1369 | continue; | |
1370 | } | |
1371 | ||
1372 | SYSTRACE("Failed to open \"%s\" device", path); | |
1373 | /* Device nodes are only partially useable. */ | |
1374 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1375 | } | |
5e73416f CB |
1376 | } |
1377 | ||
5067e4dd CB |
1378 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1379 | /* If we are dealing with partially functional device | |
1380 | * nodes the prio mknod() call will have created the | |
1381 | * device node so we can use it as a bind-mount target. | |
1382 | */ | |
1383 | ret = mknod(path, S_IFREG | 0000, 0); | |
1384 | if (ret < 0 && errno != EEXIST) { | |
1385 | SYSERROR("Failed to create file \"%s\"", path); | |
1386 | return -1; | |
1387 | } | |
5e73416f CB |
1388 | } |
1389 | ||
1390 | /* Fallback to bind-mounting the device from the host. */ | |
1391 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", device->name); | |
1392 | if (ret < 0 || ret >= MAXPATHLEN) | |
1393 | return -1; | |
1394 | ||
1395 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1396 | rootfs->path ? rootfs->mount : NULL); | |
1397 | if (ret < 0) { | |
1398 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1399 | "onto \"%s\"", hostpath, path); | |
1400 | return -1; | |
c6883f38 | 1401 | } |
5e73416f CB |
1402 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1403 | hostpath, path); | |
c6883f38 | 1404 | } |
5e73416f | 1405 | (void)umask(cmask); |
c6883f38 | 1406 | |
3999be0a | 1407 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1408 | return 0; |
1409 | } | |
1410 | ||
9aa76a17 | 1411 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1412 | { |
9aa76a17 | 1413 | int ret; |
10bc1861 | 1414 | struct lxc_storage *bdev; |
91c3e281 | 1415 | const struct lxc_rootfs *rootfs; |
cc28d0b0 | 1416 | |
91c3e281 | 1417 | rootfs = &conf->rootfs; |
a0f379bf | 1418 | if (!rootfs->path) { |
0fd73091 CB |
1419 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1420 | if (ret < 0) { | |
1421 | SYSERROR("Failed to make / rslave"); | |
a0f379bf DW |
1422 | return -1; |
1423 | } | |
0fd73091 | 1424 | |
c69bd12f | 1425 | return 0; |
a0f379bf | 1426 | } |
0ad19a3f | 1427 | |
0fd73091 CB |
1428 | ret = access(rootfs->mount, F_OK); |
1429 | if (ret != 0) { | |
1430 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1431 | rootfs->mount); |
b1789442 DL |
1432 | return -1; |
1433 | } | |
1434 | ||
8a388ed4 | 1435 | bdev = storage_init(conf); |
9aa76a17 | 1436 | if (!bdev) { |
0fd73091 | 1437 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1438 | rootfs->path, rootfs->mount, |
1439 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1440 | return -1; |
9be53773 | 1441 | } |
9aa76a17 CB |
1442 | |
1443 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1444 | storage_put(bdev); |
9aa76a17 | 1445 | if (ret < 0) { |
0fd73091 | 1446 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1447 | rootfs->path, rootfs->mount, |
1448 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1449 | return -1; |
1450 | } | |
0ad19a3f | 1451 | |
0fd73091 | 1452 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1453 | rootfs->path, rootfs->mount, |
1454 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1455 | |
ac778708 DL |
1456 | return 0; |
1457 | } | |
1458 | ||
91e93c71 AV |
1459 | int prepare_ramfs_root(char *root) |
1460 | { | |
0fd73091 CB |
1461 | int i, ret; |
1462 | char *p, *p2; | |
1463 | char buf[LXC_LINELEN], nroot[PATH_MAX]; | |
91e93c71 | 1464 | FILE *f; |
91e93c71 | 1465 | |
0fd73091 CB |
1466 | if (!realpath(root, nroot)) |
1467 | return -1; | |
91e93c71 | 1468 | |
0fd73091 CB |
1469 | ret = chdir("/"); |
1470 | if (ret < 0) | |
1471 | return -1; | |
91e93c71 | 1472 | |
0fd73091 CB |
1473 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1474 | * can't be moved. | |
91e93c71 | 1475 | */ |
0fd73091 CB |
1476 | ret = mount(root, "/", NULL, MS_REC | MS_BIND, NULL); |
1477 | if (ret < 0) { | |
1478 | SYSERROR("Failed to move \"%s\" into \"/\"", root); | |
1479 | return -1; | |
91e93c71 AV |
1480 | } |
1481 | ||
0fd73091 CB |
1482 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1483 | if (ret < 0) { | |
1484 | SYSERROR("Failed to make \"/\" rprivate"); | |
1485 | return -1; | |
91e93c71 AV |
1486 | } |
1487 | ||
0fd73091 CB |
1488 | /* The following code cleans up inhereted mounts which are not required |
1489 | * for CT. | |
91e93c71 AV |
1490 | * |
1491 | * The mountinfo file shows not all mounts, if a few points have been | |
1492 | * unmounted between read operations from the mountinfo. So we need to | |
1493 | * read mountinfo a few times. | |
1494 | * | |
1495 | * This loop can be skipped if a container uses unserns, because all | |
1496 | * inherited mounts are locked and we should live with all this trash. | |
1497 | */ | |
0fd73091 | 1498 | for (;;) { |
91e93c71 AV |
1499 | int progress = 0; |
1500 | ||
1501 | f = fopen("./proc/self/mountinfo", "r"); | |
1502 | if (!f) { | |
1503 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1504 | return -1; | |
1505 | } | |
0fd73091 | 1506 | |
eab15c1e | 1507 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1508 | for (p = buf, i=0; p && i < 4; i++) |
1509 | p = strchr(p+1, ' '); | |
0fd73091 | 1510 | |
91e93c71 AV |
1511 | if (!p) |
1512 | continue; | |
0fd73091 | 1513 | |
91e93c71 AV |
1514 | p2 = strchr(p+1, ' '); |
1515 | if (!p2) | |
1516 | continue; | |
1517 | ||
1518 | *p2 = '\0'; | |
1519 | *p = '.'; | |
1520 | ||
1521 | if (strcmp(p + 1, "/") == 0) | |
1522 | continue; | |
0fd73091 | 1523 | |
91e93c71 AV |
1524 | if (strcmp(p + 1, "/proc") == 0) |
1525 | continue; | |
1526 | ||
0fd73091 CB |
1527 | ret = umount2(p, MNT_DETACH); |
1528 | if (ret == 0) | |
91e93c71 AV |
1529 | progress++; |
1530 | } | |
0fd73091 | 1531 | |
91e93c71 | 1532 | fclose(f); |
0fd73091 | 1533 | |
91e93c71 AV |
1534 | if (!progress) |
1535 | break; | |
1536 | } | |
1537 | ||
0fd73091 CB |
1538 | /* This also can be skipped if a container uses unserns. */ |
1539 | (void)umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1540 | |
1541 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1542 | ret = chdir(".."); |
1543 | if (ret < 0) { | |
91e93c71 AV |
1544 | SYSERROR("Unable to change working directory"); |
1545 | return -1; | |
1546 | } | |
1547 | ||
0fd73091 CB |
1548 | ret = chroot("."); |
1549 | if (ret < 0) { | |
91e93c71 AV |
1550 | SYSERROR("Unable to chroot"); |
1551 | return -1; | |
1552 | } | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
74a3920a | 1557 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1558 | { |
0fd73091 CB |
1559 | int ret; |
1560 | ||
39c7b795 | 1561 | if (!rootfs->path) { |
0fd73091 | 1562 | DEBUG("Container does not have a rootfs"); |
ac778708 | 1563 | return 0; |
39c7b795 | 1564 | } |
ac778708 | 1565 | |
91e93c71 | 1566 | if (detect_ramfs_rootfs()) { |
0fd73091 CB |
1567 | DEBUG("Detected that container is on ramfs"); |
1568 | ||
1569 | ret = prepare_ramfs_root(rootfs->mount); | |
1570 | if (ret < 0) { | |
1571 | ERROR("Failed to prepare minimal ramfs root"); | |
91e93c71 | 1572 | return -1; |
39c7b795 CB |
1573 | } |
1574 | ||
0fd73091 | 1575 | DEBUG("Prepared ramfs root for container"); |
39c7b795 CB |
1576 | return 0; |
1577 | } | |
1578 | ||
0fd73091 CB |
1579 | ret = setup_rootfs_pivot_root(rootfs->mount); |
1580 | if (ret < 0) { | |
1581 | ERROR("Failed to pivot_root()"); | |
25368b52 | 1582 | return -1; |
c69bd12f DL |
1583 | } |
1584 | ||
0fd73091 | 1585 | DEBUG("Finished pivot_root()"); |
25368b52 | 1586 | return 0; |
0ad19a3f | 1587 | } |
1588 | ||
5173b710 | 1589 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, unsigned id, |
f4900711 CB |
1590 | enum idtype idtype) |
1591 | { | |
1592 | struct lxc_list *it; | |
1593 | struct id_map *map; | |
1594 | struct id_map *retmap = NULL; | |
1595 | ||
dcf0ffdf CB |
1596 | /* Shortcut for container's root mappings. */ |
1597 | if (id == 0) { | |
1598 | if (idtype == ID_TYPE_UID) | |
1599 | return conf->root_nsuid_map; | |
1600 | ||
1601 | if (idtype == ID_TYPE_GID) | |
1602 | return conf->root_nsgid_map; | |
1603 | } | |
1604 | ||
f4900711 CB |
1605 | lxc_list_for_each(it, &conf->id_map) { |
1606 | map = it->elem; | |
1607 | if (map->idtype != idtype) | |
1608 | continue; | |
1609 | ||
1610 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1611 | retmap = map; | |
1612 | break; | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | return retmap; | |
1617 | } | |
1618 | ||
1619 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1620 | { |
70761e5e | 1621 | int ret; |
11293068 | 1622 | const char *default_devpts_mntopts = "gid=5,newinstance,ptmxmode=0666,mode=0620"; |
9d28c4f9 | 1623 | char devpts_mntopts[256]; |
77890c6d | 1624 | |
e528c735 | 1625 | if (conf->pty_max <= 0) { |
0fd73091 | 1626 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1627 | "devices are requested"); |
d852c78c | 1628 | return 0; |
3c26f34e | 1629 | } |
1630 | ||
e528c735 CB |
1631 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1632 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1633 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1634 | return -1; | |
1635 | ||
77f94854 CB |
1636 | ret = umount2("/dev/pts", MNT_DETACH); |
1637 | if (ret < 0) | |
a24c5678 | 1638 | SYSWARN("Failed to unmount old devpts instance"); |
77f94854 | 1639 | else |
0fd73091 | 1640 | DEBUG("Unmounted old devpts instance"); |
7e40254a | 1641 | |
70761e5e CB |
1642 | /* Create mountpoint for devpts instance. */ |
1643 | ret = mkdir("/dev/pts", 0755); | |
1644 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1645 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1646 | return -1; |
1647 | } | |
1648 | ||
11293068 | 1649 | /* mount new devpts instance */ |
f4900711 | 1650 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts); |
70761e5e | 1651 | if (ret < 0) { |
11293068 CB |
1652 | /* try mounting without gid=5 */ |
1653 | ret = mount("devpts", "/dev/pts", "devpts", | |
1654 | MS_NOSUID | MS_NOEXEC, devpts_mntopts + sizeof("gid=5")); | |
1655 | if (ret < 0) { | |
1656 | SYSERROR("Failed to mount new devpts instance"); | |
1657 | return -1; | |
1658 | } | |
70761e5e | 1659 | } |
0fd73091 | 1660 | DEBUG("Mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1661 | |
d5cb35d6 | 1662 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1663 | ret = remove("/dev/ptmx"); |
1664 | if (ret < 0) { | |
1665 | if (errno != ENOENT) { | |
0fd73091 | 1666 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1667 | return -1; |
70761e5e | 1668 | } |
b29e05d6 | 1669 | } else { |
0fd73091 | 1670 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1671 | } |
1672 | ||
d5cb35d6 | 1673 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1674 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1675 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1676 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1677 | return -1; |
1678 | } | |
0fd73091 | 1679 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1680 | |
d5cb35d6 | 1681 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1682 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1683 | if (!ret) { |
0fd73091 | 1684 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1685 | return 0; |
1686 | } else { | |
1687 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1688 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1689 | } |
1690 | ||
1691 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1692 | ret = remove("/dev/ptmx"); | |
70761e5e | 1693 | if (ret < 0) { |
0fd73091 | 1694 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1695 | return -1; |
1696 | } | |
1697 | ||
1698 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1699 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1700 | if (ret < 0) { | |
0fd73091 | 1701 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1702 | return -1; |
1703 | } | |
0fd73091 | 1704 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1705 | |
3c26f34e | 1706 | return 0; |
1707 | } | |
1708 | ||
cccc74b5 DL |
1709 | static int setup_personality(int persona) |
1710 | { | |
0fd73091 CB |
1711 | int ret; |
1712 | ||
1713 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1714 | if (persona == -1) |
1715 | return 0; | |
1716 | ||
0fd73091 CB |
1717 | ret = personality(persona); |
1718 | if (ret < 0) { | |
1719 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1720 | return -1; |
1721 | } | |
1722 | ||
0fd73091 CB |
1723 | INFO("Set personality to \"0x%x\"", persona); |
1724 | #endif | |
cccc74b5 DL |
1725 | |
1726 | return 0; | |
1727 | } | |
1728 | ||
3d7d929a | 1729 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1730 | const struct lxc_terminal *console) |
6e590161 | 1731 | { |
882671aa | 1732 | int ret; |
63376d7d | 1733 | char path[MAXPATHLEN]; |
86530b0a | 1734 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1735 | |
8b1b1210 CB |
1736 | if (console->path && !strcmp(console->path, "none")) |
1737 | return 0; | |
1738 | ||
86530b0a | 1739 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1740 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1741 | return -1; |
52e35957 | 1742 | |
8b1b1210 CB |
1743 | /* When we are asked to setup a console we remove any previous |
1744 | * /dev/console bind-mounts. | |
1745 | */ | |
a7ba3c7f CB |
1746 | if (file_exists(path)) { |
1747 | ret = lxc_unstack_mountpoint(path, false); | |
1748 | if (ret < 0) { | |
6d1400b5 | 1749 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1750 | return -ret; |
1751 | } else { | |
86530b0a | 1752 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1753 | } |
8b1b1210 CB |
1754 | } |
1755 | ||
1756 | /* For unprivileged containers autodev or automounts will already have | |
1757 | * taken care of creating /dev/console. | |
1758 | */ | |
882671aa | 1759 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1760 | if (ret < 0 && errno != EEXIST) { |
1761 | SYSERROR("Failed to create console"); | |
1762 | return -errno; | |
52e35957 DL |
1763 | } |
1764 | ||
882671aa | 1765 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP | S_IXOTH); |
86530b0a | 1766 | if (ret < 0) { |
0fd73091 CB |
1767 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1768 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
3d7d929a | 1769 | return -errno; |
63376d7d | 1770 | } |
13954cce | 1771 | |
86530b0a L |
1772 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1773 | if (ret < 0) { | |
0fd73091 | 1774 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1775 | return -1; |
1776 | } | |
1777 | ||
86530b0a | 1778 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1779 | return 0; |
1780 | } | |
1781 | ||
3d7d929a | 1782 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1783 | const struct lxc_terminal *console, |
3d7d929a | 1784 | char *ttydir) |
7c6ef2a2 | 1785 | { |
3b7e332f | 1786 | int ret; |
3d7d929a | 1787 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
86530b0a | 1788 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1789 | |
3dc035f1 L |
1790 | if (console->path && !strcmp(console->path, "none")) |
1791 | return 0; | |
1792 | ||
7c6ef2a2 | 1793 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1794 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1795 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1796 | return -1; |
3d7d929a | 1797 | |
7c6ef2a2 SH |
1798 | ret = mkdir(path, 0755); |
1799 | if (ret && errno != EEXIST) { | |
0fd73091 | 1800 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1801 | return -errno; |
7c6ef2a2 | 1802 | } |
4742cd9a | 1803 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1804 | |
86530b0a | 1805 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1806 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1807 | return -1; | |
1808 | ||
3b7e332f CB |
1809 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1810 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1811 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1812 | return -errno; |
7c6ef2a2 | 1813 | } |
7c6ef2a2 | 1814 | |
86530b0a | 1815 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1816 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1817 | return -1; |
2a12fefd | 1818 | |
3dc035f1 | 1819 | if (file_exists(path)) { |
a7ba3c7f | 1820 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1821 | if (ret < 0) { |
6d1400b5 | 1822 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1823 | return -ret; |
1824 | } else { | |
86530b0a | 1825 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1826 | } |
3dc035f1 | 1827 | } |
2a12fefd | 1828 | |
3b7e332f CB |
1829 | ret = mknod(path, S_IFREG | 0000, 0); |
1830 | if (ret < 0 && errno != EEXIST) { | |
1831 | SYSERROR("Failed to create console"); | |
1832 | return -errno; | |
7c6ef2a2 SH |
1833 | } |
1834 | ||
3b7e332f | 1835 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP | S_IXOTH); |
86530b0a | 1836 | if (ret < 0) { |
0fd73091 CB |
1837 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1838 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
2a12fefd CB |
1839 | return -errno; |
1840 | } | |
1841 | ||
3dc035f1 | 1842 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1843 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1844 | if (ret < 0) { | |
0fd73091 | 1845 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1846 | return -1; |
1847 | } | |
86530b0a | 1848 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1849 | |
1850 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1851 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1852 | if (ret < 0) { | |
0fd73091 | 1853 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1854 | return -1; |
1855 | } | |
86530b0a | 1856 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1857 | |
86530b0a | 1858 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1859 | return 0; |
1860 | } | |
1861 | ||
3d7d929a | 1862 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1863 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1864 | { |
3d7d929a | 1865 | |
7c6ef2a2 | 1866 | if (!ttydir) |
3d7d929a | 1867 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1868 | |
3d7d929a | 1869 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1870 | } |
1871 | ||
efed99a4 | 1872 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1873 | { |
1874 | struct mount_opt *mo; | |
1875 | ||
1876 | /* If opt is found in mount_opt, set or clear flags. | |
1877 | * Otherwise append it to data. */ | |
1878 | ||
1879 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1880 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1881 | if (mo->clear) |
1882 | *flags &= ~mo->flag; | |
1883 | else | |
1884 | *flags |= mo->flag; | |
1885 | return; | |
1886 | } | |
1887 | } | |
1888 | ||
f1e05b90 DJ |
1889 | if (strlen(*data)) |
1890 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1891 | |
f1e05b90 | 1892 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1893 | } |
1894 | ||
0fd73091 | 1895 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1896 | { |
0fd73091 CB |
1897 | char *data, *p, *s; |
1898 | char *saveptr = NULL; | |
efed99a4 | 1899 | size_t size; |
998ac676 | 1900 | |
911324ef | 1901 | *mntdata = NULL; |
91656ce5 | 1902 | *mntflags = 0L; |
911324ef DL |
1903 | |
1904 | if (!mntopts) | |
998ac676 RT |
1905 | return 0; |
1906 | ||
911324ef | 1907 | s = strdup(mntopts); |
0fd73091 | 1908 | if (!s) |
998ac676 | 1909 | return -1; |
998ac676 | 1910 | |
efed99a4 DJ |
1911 | size = strlen(s) + 1; |
1912 | data = malloc(size); | |
998ac676 | 1913 | if (!data) { |
998ac676 RT |
1914 | free(s); |
1915 | return -1; | |
1916 | } | |
1917 | *data = 0; | |
1918 | ||
0fd73091 | 1919 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) |
efed99a4 | 1920 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1921 | |
1922 | if (*data) | |
1923 | *mntdata = data; | |
1924 | else | |
1925 | free(data); | |
1926 | free(s); | |
1927 | ||
1928 | return 0; | |
1929 | } | |
1930 | ||
d840039e YT |
1931 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1932 | { | |
1933 | struct mount_opt *mo; | |
1934 | ||
1935 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1936 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1937 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1938 | continue; | |
1939 | ||
1940 | if (mo->clear) | |
1941 | *flags &= ~mo->flag; | |
1942 | else | |
1943 | *flags |= mo->flag; | |
1944 | ||
1945 | return; | |
d840039e YT |
1946 | } |
1947 | } | |
1948 | ||
1949 | static int parse_propagationopts(const char *mntopts, unsigned long *pflags) | |
1950 | { | |
0fd73091 CB |
1951 | char *p, *s; |
1952 | char *saveptr = NULL; | |
d840039e YT |
1953 | |
1954 | if (!mntopts) | |
1955 | return 0; | |
1956 | ||
1957 | s = strdup(mntopts); | |
1958 | if (!s) { | |
1959 | SYSERROR("Failed to allocate memory"); | |
1960 | return -ENOMEM; | |
1961 | } | |
1962 | ||
0fd73091 CB |
1963 | *pflags = 0L; |
1964 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) | |
d840039e | 1965 | parse_propagationopt(p, pflags); |
d840039e | 1966 | free(s); |
0fd73091 | 1967 | |
d840039e YT |
1968 | return 0; |
1969 | } | |
1970 | ||
6fd5e769 SH |
1971 | static void null_endofword(char *word) |
1972 | { | |
1973 | while (*word && *word != ' ' && *word != '\t') | |
1974 | word++; | |
1975 | *word = '\0'; | |
1976 | } | |
1977 | ||
0fd73091 | 1978 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1979 | static char *get_field(char *src, int nfields) |
1980 | { | |
6fd5e769 | 1981 | int i; |
0fd73091 | 1982 | char *p = src; |
6fd5e769 SH |
1983 | |
1984 | for (i = 0; i < nfields; i++) { | |
1985 | while (*p && *p != ' ' && *p != '\t') | |
1986 | p++; | |
0fd73091 | 1987 | |
6fd5e769 SH |
1988 | if (!*p) |
1989 | break; | |
0fd73091 | 1990 | |
6fd5e769 SH |
1991 | p++; |
1992 | } | |
0fd73091 | 1993 | |
6fd5e769 SH |
1994 | return p; |
1995 | } | |
1996 | ||
911324ef DL |
1997 | static int mount_entry(const char *fsname, const char *target, |
1998 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1999 | unsigned long pflags, const char *data, bool optional, |
2000 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2001 | { |
0ac4b28a | 2002 | int ret; |
181437fd YT |
2003 | char srcbuf[MAXPATHLEN]; |
2004 | const char *srcpath = fsname; | |
614305f3 | 2005 | #ifdef HAVE_STATVFS |
2938f7c8 | 2006 | struct statvfs sb; |
614305f3 | 2007 | #endif |
2938f7c8 | 2008 | |
181437fd YT |
2009 | if (relative) { |
2010 | ret = snprintf(srcbuf, MAXPATHLEN, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); | |
2011 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2012 | ERROR("source path is too long"); | |
2013 | return -1; | |
2014 | } | |
2015 | srcpath = srcbuf; | |
2016 | } | |
2017 | ||
2018 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2019 | rootfs); |
2020 | if (ret < 0) { | |
1fc64d22 | 2021 | if (optional) { |
7874d81a | 2022 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2023 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2024 | return 0; |
2025 | } | |
0ac4b28a | 2026 | |
0103eb53 | 2027 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2028 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2029 | return -1; |
911324ef DL |
2030 | } |
2031 | ||
2032 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2033 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2034 | |
2035 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2036 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2037 | |
7c5b6e7c AS |
2038 | if (mountflags & MS_RDONLY) |
2039 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2040 | #ifdef HAVE_STATVFS |
181437fd | 2041 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2042 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2043 | |
2938f7c8 SH |
2044 | if (sb.f_flag & MS_NOSUID) |
2045 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2046 | |
ae7a770e | 2047 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2048 | required_flags |= MS_NODEV; |
0ac4b28a | 2049 | |
2938f7c8 SH |
2050 | if (sb.f_flag & MS_RDONLY) |
2051 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2052 | |
2938f7c8 SH |
2053 | if (sb.f_flag & MS_NOEXEC) |
2054 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2055 | |
2056 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2057 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2058 | |
2059 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2060 | * does not have any flags which are not already in |
0ac4b28a | 2061 | * mountflags, then skip the remount. |
2938f7c8 SH |
2062 | */ |
2063 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2064 | if (!(required_flags & ~mountflags) && |
2065 | rqd_flags == 0) { | |
2066 | DEBUG("Mountflags already were %lu, " | |
2067 | "skipping remount", mountflags); | |
2938f7c8 SH |
2068 | goto skipremount; |
2069 | } | |
2070 | } | |
0ac4b28a | 2071 | |
2938f7c8 | 2072 | mountflags |= required_flags; |
6fd5e769 | 2073 | } |
614305f3 | 2074 | #endif |
911324ef | 2075 | |
181437fd | 2076 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2077 | if (ret < 0) { |
1fc64d22 | 2078 | if (optional) { |
7874d81a | 2079 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2080 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2081 | return 0; |
2082 | } | |
0ac4b28a | 2083 | |
0103eb53 | 2084 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2085 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2086 | return -1; |
911324ef DL |
2087 | } |
2088 | } | |
2089 | ||
d840039e YT |
2090 | if (pflags) { |
2091 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2092 | if (ret < 0) { | |
2093 | if (optional) { | |
7874d81a | 2094 | SYSINFO("Failed to change mount propagation " |
2095 | "for \"%s\" (optional)", target); | |
d840039e YT |
2096 | return 0; |
2097 | } else { | |
2098 | SYSERROR("Failed to change mount propagation " | |
2099 | "for \"%s\" (optional)", target); | |
2100 | return -1; | |
2101 | } | |
2102 | } | |
2103 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2104 | } | |
2105 | ||
2106 | ||
614305f3 | 2107 | #ifdef HAVE_STATVFS |
6fd5e769 | 2108 | skipremount: |
614305f3 | 2109 | #endif |
0103eb53 | 2110 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2111 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2112 | |
2113 | return 0; | |
2114 | } | |
2115 | ||
c5e30de4 | 2116 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2117 | static void cull_mntent_opt(struct mntent *mntent) |
2118 | { | |
2119 | int i; | |
0fd73091 CB |
2120 | char *list[] = { |
2121 | "create=dir", | |
2122 | "create=file", | |
2123 | "optional", | |
2124 | "relative", | |
2125 | NULL | |
2126 | }; | |
c5e30de4 CB |
2127 | |
2128 | for (i = 0; list[i]; i++) { | |
2129 | char *p, *p2; | |
2130 | ||
2131 | p = strstr(mntent->mnt_opts, list[i]); | |
2132 | if (!p) | |
4e4ca161 | 2133 | continue; |
c5e30de4 | 2134 | |
4e4ca161 SH |
2135 | p2 = strchr(p, ','); |
2136 | if (!p2) { | |
2137 | /* no more mntopts, so just chop it here */ | |
2138 | *p = '\0'; | |
2139 | continue; | |
2140 | } | |
c5e30de4 CB |
2141 | |
2142 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2143 | } |
2144 | } | |
2145 | ||
4d5b72a1 | 2146 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2147 | const char *path, |
2148 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2149 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2150 | { |
3b7e332f | 2151 | int ret; |
12e6ab5d | 2152 | char *p1, *p2; |
911324ef | 2153 | |
12e6ab5d | 2154 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2155 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2156 | if (ret < 0) |
2157 | return -1; | |
2158 | } | |
6e46cc0d | 2159 | |
34cfffb3 | 2160 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2161 | ret = mkdir_p(path, 0755); |
2162 | if (ret < 0 && errno != EEXIST) { | |
2163 | SYSERROR("Failed to create directory \"%s\"", path); | |
2164 | return -1; | |
34cfffb3 SG |
2165 | } |
2166 | } | |
2167 | ||
0fd73091 CB |
2168 | if (!hasmntopt(mntent, "create=file")) |
2169 | return 0; | |
749f98d9 | 2170 | |
0fd73091 CB |
2171 | ret = access(path, F_OK); |
2172 | if (ret == 0) | |
2173 | return 0; | |
749f98d9 | 2174 | |
0fd73091 CB |
2175 | p1 = strdup(path); |
2176 | if (!p1) | |
2177 | return -1; | |
749f98d9 | 2178 | |
0fd73091 | 2179 | p2 = dirname(p1); |
749f98d9 | 2180 | |
0fd73091 CB |
2181 | ret = mkdir_p(p2, 0755); |
2182 | free(p1); | |
2183 | if (ret < 0 && errno != EEXIST) { | |
2184 | SYSERROR("Failed to create directory \"%s\"", path); | |
2185 | return -1; | |
34cfffb3 | 2186 | } |
749f98d9 | 2187 | |
3b7e332f CB |
2188 | ret = mknod(path, S_IFREG | 0000, 0); |
2189 | if (ret < 0 && errno != EEXIST) | |
2190 | return -errno; | |
0fd73091 | 2191 | |
749f98d9 | 2192 | return 0; |
4d5b72a1 NC |
2193 | } |
2194 | ||
ec50007f CB |
2195 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2196 | * without a rootfs. */ | |
db4aba38 | 2197 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2198 | const char *path, |
2199 | const struct lxc_rootfs *rootfs, | |
2200 | const char *lxc_name, | |
2201 | const char *lxc_path) | |
4d5b72a1 | 2202 | { |
d8b712bc | 2203 | int ret; |
949d0338 | 2204 | unsigned long mntflags; |
4d5b72a1 | 2205 | char *mntdata; |
181437fd | 2206 | bool dev, optional, relative; |
949d0338 | 2207 | unsigned long pflags = 0; |
ec50007f | 2208 | char *rootfs_path = NULL; |
d8b712bc CB |
2209 | |
2210 | optional = hasmntopt(mntent, "optional") != NULL; | |
2211 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2212 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2213 | |
ec50007f CB |
2214 | if (rootfs && rootfs->path) |
2215 | rootfs_path = rootfs->mount; | |
2216 | ||
d8b712bc CB |
2217 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2218 | lxc_path); | |
2219 | if (ret < 0) { | |
2220 | if (optional) | |
2221 | return 0; | |
608e3567 | 2222 | |
d8b712bc CB |
2223 | return -1; |
2224 | } | |
4e4ca161 SH |
2225 | cull_mntent_opt(mntent); |
2226 | ||
d840039e YT |
2227 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2228 | if (ret < 0) | |
2229 | return -1; | |
2230 | ||
d8b712bc CB |
2231 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2232 | if (ret < 0) | |
a17b1e65 | 2233 | return -1; |
a17b1e65 | 2234 | |
6e46cc0d | 2235 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2236 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2237 | |
911324ef | 2238 | free(mntdata); |
911324ef DL |
2239 | return ret; |
2240 | } | |
2241 | ||
db4aba38 NC |
2242 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2243 | { | |
1433c9f9 | 2244 | int ret; |
07667a6a | 2245 | char path[MAXPATHLEN]; |
1433c9f9 CB |
2246 | |
2247 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2248 | * absolute paths starting at / on the host. |
2249 | */ | |
1433c9f9 CB |
2250 | if (mntent->mnt_dir[0] != '/') |
2251 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2252 | else | |
2253 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2254 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2255 | return -1; |
1433c9f9 CB |
2256 | |
2257 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2258 | } |
2259 | ||
4e4ca161 | 2260 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2261 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2262 | const char *lxc_name, |
2263 | const char *lxc_path) | |
911324ef | 2264 | { |
bdd2b34c | 2265 | int offset; |
013bd428 | 2266 | char *aux; |
67e571de | 2267 | const char *lxcpath; |
bdd2b34c CB |
2268 | char path[MAXPATHLEN]; |
2269 | int ret = 0; | |
0ad19a3f | 2270 | |
593e8478 | 2271 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2272 | if (!lxcpath) |
2a59a681 | 2273 | return -1; |
2a59a681 | 2274 | |
bdd2b34c CB |
2275 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2276 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2277 | */ | |
2278 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
2279 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
2280 | goto skipvarlib; |
2281 | ||
2282 | aux = strstr(mntent->mnt_dir, path); | |
2283 | if (aux) { | |
2284 | offset = strlen(path); | |
2285 | goto skipabs; | |
2286 | } | |
2287 | ||
2288 | skipvarlib: | |
013bd428 DL |
2289 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2290 | if (!aux) { | |
bdd2b34c | 2291 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2292 | return ret; |
013bd428 | 2293 | } |
80a881b2 SH |
2294 | offset = strlen(rootfs->path); |
2295 | ||
2296 | skipabs: | |
bdd2b34c CB |
2297 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
2298 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 2299 | return -1; |
a17b1e65 | 2300 | |
0a2dddd4 | 2301 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2302 | } |
d330fe7b | 2303 | |
4e4ca161 | 2304 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2305 | const struct lxc_rootfs *rootfs, |
2306 | const char *lxc_name, | |
2307 | const char *lxc_path) | |
911324ef | 2308 | { |
911324ef | 2309 | int ret; |
0fd73091 | 2310 | char path[MAXPATHLEN]; |
d330fe7b | 2311 | |
34cfffb3 | 2312 | /* relative to root mount point */ |
6e46cc0d | 2313 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2314 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2315 | return -1; |
911324ef | 2316 | |
0a2dddd4 | 2317 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2318 | } |
2319 | ||
06749971 CB |
2320 | static int mount_file_entries(const struct lxc_conf *conf, |
2321 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2322 | const char *lxc_name, const char *lxc_path) |
911324ef | 2323 | { |
aaf901be | 2324 | char buf[4096]; |
0fd73091 | 2325 | struct mntent mntent; |
911324ef | 2326 | int ret = -1; |
e76b8764 | 2327 | |
aaf901be | 2328 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2329 | if (!rootfs->path) |
2330 | ret = mount_entry_on_systemfs(&mntent); | |
2331 | else if (mntent.mnt_dir[0] != '/') | |
2332 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2333 | lxc_name, lxc_path); | |
2334 | else | |
2335 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2336 | lxc_name, lxc_path); | |
2337 | if (ret < 0) | |
2338 | return -1; | |
0ad19a3f | 2339 | } |
2340 | ret = 0; | |
cd54d859 | 2341 | |
0fd73091 | 2342 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2343 | return ret; |
2344 | } | |
2345 | ||
06749971 CB |
2346 | static int setup_mount(const struct lxc_conf *conf, |
2347 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2348 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2349 | { |
42dff448 | 2350 | FILE *f; |
e7938e9e MN |
2351 | int ret; |
2352 | ||
2353 | if (!fstab) | |
2354 | return 0; | |
2355 | ||
42dff448 CB |
2356 | f = setmntent(fstab, "r"); |
2357 | if (!f) { | |
2358 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2359 | return -1; |
2360 | } | |
2361 | ||
06749971 | 2362 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2363 | if (ret < 0) |
2364 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2365 | |
42dff448 | 2366 | endmntent(f); |
0ad19a3f | 2367 | return ret; |
2368 | } | |
2369 | ||
5ef5c9a3 | 2370 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2371 | { |
5ef5c9a3 | 2372 | int ret; |
e7938e9e | 2373 | char *mount_entry; |
5ef5c9a3 | 2374 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2375 | int fd = -1; |
2376 | ||
0fd73091 | 2377 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2378 | if (fd < 0) { |
a324e7eb CB |
2379 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2380 | ||
5ef5c9a3 CB |
2381 | if (errno != ENOSYS) |
2382 | return NULL; | |
a324e7eb CB |
2383 | |
2384 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2385 | if (fd < 0) { |
2386 | SYSERROR("Could not create temporary mount file"); | |
2387 | return NULL; | |
2388 | } | |
2389 | ||
6bd04140 | 2390 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2391 | } |
0fd73091 CB |
2392 | if (fd < 0) { |
2393 | SYSERROR("Could not create temporary mount file"); | |
9fc7f8c0 | 2394 | return NULL; |
e7938e9e MN |
2395 | } |
2396 | ||
0fd73091 CB |
2397 | lxc_list_for_each (iterator, mount) { |
2398 | size_t len; | |
2399 | ||
e7938e9e | 2400 | mount_entry = iterator->elem; |
0fd73091 | 2401 | len = strlen(mount_entry); |
5ef5c9a3 | 2402 | |
489f39be | 2403 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 CB |
2404 | if (ret != len) |
2405 | goto on_error; | |
2406 | ||
489f39be | 2407 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 CB |
2408 | if (ret != 1) |
2409 | goto on_error; | |
e7938e9e MN |
2410 | } |
2411 | ||
0fd73091 CB |
2412 | ret = lseek(fd, 0, SEEK_SET); |
2413 | if (ret < 0) | |
2414 | goto on_error; | |
2415 | ||
2416 | return fdopen(fd, "r+"); | |
2417 | ||
2418 | on_error: | |
2419 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2420 | close(fd); | |
2421 | return NULL; | |
9fc7f8c0 TA |
2422 | } |
2423 | ||
06749971 CB |
2424 | static int setup_mount_entries(const struct lxc_conf *conf, |
2425 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2426 | struct lxc_list *mount, const char *lxc_name, |
2427 | const char *lxc_path) | |
9fc7f8c0 | 2428 | { |
9fc7f8c0 | 2429 | int ret; |
0fd73091 | 2430 | FILE *f; |
9fc7f8c0 | 2431 | |
19b5d755 CB |
2432 | f = make_anonymous_mount_file(mount); |
2433 | if (!f) | |
9fc7f8c0 | 2434 | return -1; |
e7938e9e | 2435 | |
06749971 | 2436 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2437 | fclose(f); |
0fd73091 | 2438 | |
e7938e9e MN |
2439 | return ret; |
2440 | } | |
2441 | ||
bab88e68 CS |
2442 | static int parse_cap(const char *cap) |
2443 | { | |
84760c11 | 2444 | size_t i; |
2445 | int capid = -1; | |
0fd73091 CB |
2446 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2447 | char *ptr = NULL; | |
bab88e68 | 2448 | |
0fd73091 | 2449 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2450 | return -2; |
2451 | ||
8560cd36 | 2452 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2453 | if (strcmp(cap, caps_opt[i].name)) |
2454 | continue; | |
2455 | ||
2456 | capid = caps_opt[i].value; | |
2457 | break; | |
2458 | } | |
2459 | ||
2460 | if (capid < 0) { | |
0fd73091 CB |
2461 | /* Try to see if it's numeric, so the user may specify |
2462 | * capabilities that the running kernel knows about but we | |
2463 | * don't | |
2464 | */ | |
bab88e68 CS |
2465 | errno = 0; |
2466 | capid = strtol(cap, &ptr, 10); | |
2467 | if (!ptr || *ptr != '\0' || errno != 0) | |
2468 | /* not a valid number */ | |
2469 | capid = -1; | |
2470 | else if (capid > lxc_caps_last_cap()) | |
2471 | /* we have a number but it's not a valid | |
2472 | * capability */ | |
2473 | capid = -1; | |
2474 | } | |
2475 | ||
2476 | return capid; | |
2477 | } | |
2478 | ||
0769b82a CS |
2479 | int in_caplist(int cap, struct lxc_list *caps) |
2480 | { | |
0769b82a | 2481 | int capid; |
0fd73091 | 2482 | struct lxc_list *iterator; |
0769b82a | 2483 | |
0fd73091 | 2484 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2485 | capid = parse_cap(iterator->elem); |
2486 | if (capid == cap) | |
2487 | return 1; | |
2488 | } | |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
81810dd1 DL |
2493 | static int setup_caps(struct lxc_list *caps) |
2494 | { | |
bab88e68 | 2495 | int capid; |
0fd73091 CB |
2496 | char *drop_entry; |
2497 | struct lxc_list *iterator; | |
81810dd1 | 2498 | |
0fd73091 CB |
2499 | lxc_list_for_each (iterator, caps) { |
2500 | int ret; | |
81810dd1 DL |
2501 | |
2502 | drop_entry = iterator->elem; | |
2503 | ||
bab88e68 | 2504 | capid = parse_cap(drop_entry); |
0fd73091 | 2505 | if (capid < 0) { |
1e11be34 DL |
2506 | ERROR("unknown capability %s", drop_entry); |
2507 | return -1; | |
81810dd1 DL |
2508 | } |
2509 | ||
0fd73091 CB |
2510 | ret = prctl(PR_CAPBSET_DROP, capid, 0, 0, 0); |
2511 | if (ret < 0) { | |
2512 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2513 | return -1; |
2514 | } | |
0fd73091 | 2515 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2516 | } |
2517 | ||
0fd73091 | 2518 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2519 | return 0; |
2520 | } | |
2521 | ||
2522 | static int dropcaps_except(struct lxc_list *caps) | |
2523 | { | |
0fd73091 | 2524 | int i, capid, numcaps; |
1fb86a7c | 2525 | char *keep_entry; |
0fd73091 | 2526 | struct lxc_list *iterator; |
1fb86a7c | 2527 | |
0fd73091 | 2528 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2529 | if (numcaps <= 0 || numcaps > 200) |
2530 | return -1; | |
0fd73091 | 2531 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2532 | |
1a0e70ac | 2533 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2534 | int *caplist = alloca(numcaps * sizeof(int)); |
2535 | memset(caplist, 0, numcaps * sizeof(int)); | |
2536 | ||
0fd73091 | 2537 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2538 | keep_entry = iterator->elem; |
2539 | ||
bab88e68 | 2540 | capid = parse_cap(keep_entry); |
7035407c DE |
2541 | if (capid == -2) |
2542 | continue; | |
2543 | ||
0fd73091 CB |
2544 | if (capid < 0) { |
2545 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2546 | return -1; |
2547 | } | |
2548 | ||
0fd73091 | 2549 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2550 | caplist[capid] = 1; |
2551 | } | |
0fd73091 CB |
2552 | |
2553 | for (i = 0; i < numcaps; i++) { | |
2554 | int ret; | |
2555 | ||
1fb86a7c SH |
2556 | if (caplist[i]) |
2557 | continue; | |
0fd73091 CB |
2558 | |
2559 | ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0); | |
2560 | if (ret < 0) { | |
2561 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2562 | return -1; |
2563 | } | |
1fb86a7c SH |
2564 | } |
2565 | ||
0fd73091 | 2566 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2567 | return 0; |
2568 | } | |
2569 | ||
0fd73091 CB |
2570 | static int parse_resource(const char *res) |
2571 | { | |
2572 | int ret; | |
c6d09e15 WB |
2573 | size_t i; |
2574 | int resid = -1; | |
2575 | ||
0fd73091 | 2576 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2577 | if (strcmp(res, limit_opt[i].name) == 0) |
2578 | return limit_opt[i].value; | |
c6d09e15 | 2579 | |
0fd73091 | 2580 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2581 | * resources that the running kernel knows about but |
0fd73091 CB |
2582 | * we don't. |
2583 | */ | |
2584 | ret = lxc_safe_int(res, &resid); | |
2585 | if (ret < 0) | |
2586 | return -1; | |
2587 | ||
2588 | return resid; | |
c6d09e15 WB |
2589 | } |
2590 | ||
0fd73091 CB |
2591 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2592 | { | |
2593 | int resid; | |
c6d09e15 WB |
2594 | struct lxc_list *it; |
2595 | struct lxc_limit *lim; | |
c6d09e15 | 2596 | |
0fd73091 | 2597 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2598 | lim = it->elem; |
2599 | ||
2600 | resid = parse_resource(lim->resource); | |
2601 | if (resid < 0) { | |
0fd73091 | 2602 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2603 | return -1; |
2604 | } | |
2605 | ||
f48b5fd8 | 2606 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2607 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2608 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2609 | return -1; |
2610 | } | |
f48b5fd8 FF |
2611 | #else |
2612 | ERROR("Cannot set limit %s as prlimit is missing", lim->resource); | |
2613 | return -1; | |
2614 | #endif | |
c6d09e15 | 2615 | } |
0fd73091 | 2616 | |
c6d09e15 WB |
2617 | return 0; |
2618 | } | |
2619 | ||
7edd0540 L |
2620 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2621 | { | |
2622 | struct lxc_list *it; | |
2623 | struct lxc_sysctl *elem; | |
0fd73091 | 2624 | int ret = 0; |
7edd0540 L |
2625 | char *tmp = NULL; |
2626 | char filename[MAXPATHLEN] = {0}; | |
7edd0540 | 2627 | |
0fd73091 | 2628 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2629 | elem = it->elem; |
2630 | tmp = lxc_string_replace(".", "/", elem->key); | |
2631 | if (!tmp) { | |
2632 | ERROR("Failed to replace key %s", elem->key); | |
2633 | return -1; | |
2634 | } | |
2635 | ||
2636 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2637 | free(tmp); | |
2638 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2639 | ERROR("Error setting up sysctl parameters path"); | |
2640 | return -1; | |
2641 | } | |
2642 | ||
0fd73091 | 2643 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2644 | strlen(elem->value), false, 0666); |
7edd0540 | 2645 | if (ret < 0) { |
0fd73091 CB |
2646 | ERROR("Failed to setup sysctl parameters %s to %s", |
2647 | elem->key, elem->value); | |
7edd0540 L |
2648 | return -1; |
2649 | } | |
2650 | } | |
0fd73091 | 2651 | |
7edd0540 L |
2652 | return 0; |
2653 | } | |
2654 | ||
61d7a733 YT |
2655 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2656 | { | |
2657 | struct lxc_list *it; | |
2658 | struct lxc_proc *elem; | |
0fd73091 | 2659 | int ret = 0; |
61d7a733 YT |
2660 | char *tmp = NULL; |
2661 | char filename[MAXPATHLEN] = {0}; | |
61d7a733 | 2662 | |
0fd73091 | 2663 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2664 | elem = it->elem; |
2665 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2666 | if (!tmp) { | |
2667 | ERROR("Failed to replace key %s", elem->filename); | |
2668 | return -1; | |
2669 | } | |
2670 | ||
2671 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2672 | free(tmp); | |
2673 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2674 | ERROR("Error setting up proc filesystem path"); | |
2675 | return -1; | |
2676 | } | |
2677 | ||
0fd73091 | 2678 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2679 | strlen(elem->value), false, 0666); |
61d7a733 | 2680 | if (ret < 0) { |
0fd73091 CB |
2681 | ERROR("Failed to setup proc filesystem %s to %s", |
2682 | elem->filename, elem->value); | |
61d7a733 YT |
2683 | return -1; |
2684 | } | |
2685 | } | |
0fd73091 | 2686 | |
61d7a733 YT |
2687 | return 0; |
2688 | } | |
2689 | ||
ae9242c8 SH |
2690 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2691 | ||
7b379ab3 | 2692 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2693 | { |
26ddeedd | 2694 | int i; |
0fd73091 | 2695 | struct lxc_conf *new; |
7b379ab3 | 2696 | |
13277ec4 | 2697 | new = malloc(sizeof(*new)); |
0fd73091 | 2698 | if (!new) |
7b379ab3 | 2699 | return NULL; |
7b379ab3 MN |
2700 | memset(new, 0, sizeof(*new)); |
2701 | ||
4b73005c | 2702 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2703 | new->personality = -1; |
124fa0a8 | 2704 | new->autodev = 1; |
3a784510 | 2705 | new->console.buffer_size = 0; |
596a818d DE |
2706 | new->console.log_path = NULL; |
2707 | new->console.log_fd = -1; | |
861813e5 | 2708 | new->console.log_size = 0; |
28a4b0e5 | 2709 | new->console.path = NULL; |
63376d7d | 2710 | new->console.peer = -1; |
fb87aa6a CB |
2711 | new->console.proxy.busy = -1; |
2712 | new->console.proxy.master = -1; | |
2713 | new->console.proxy.slave = -1; | |
63376d7d DL |
2714 | new->console.master = -1; |
2715 | new->console.slave = -1; | |
2716 | new->console.name[0] = '\0'; | |
732375f5 | 2717 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2718 | new->maincmd_fd = -1; |
258f8051 | 2719 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2720 | new->nbd_idx = -1; |
54c30e29 | 2721 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2722 | if (!new->rootfs.mount) { |
53f3f048 SH |
2723 | free(new); |
2724 | return NULL; | |
2725 | } | |
858377e4 | 2726 | new->logfd = -1; |
7b379ab3 | 2727 | lxc_list_init(&new->cgroup); |
54860ed0 | 2728 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2729 | lxc_list_init(&new->network); |
2730 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2731 | lxc_list_init(&new->caps); |
1fb86a7c | 2732 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2733 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2734 | new->root_nsuid_map = NULL; |
2735 | new->root_nsgid_map = NULL; | |
f979ac15 | 2736 | lxc_list_init(&new->includes); |
4184c3e1 | 2737 | lxc_list_init(&new->aliens); |
7c661726 | 2738 | lxc_list_init(&new->environment); |
c6d09e15 | 2739 | lxc_list_init(&new->limits); |
7edd0540 | 2740 | lxc_list_init(&new->sysctls); |
61d7a733 | 2741 | lxc_list_init(&new->procs); |
44ae0fb6 | 2742 | new->hooks_version = 0; |
28d9e29e | 2743 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2744 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2745 | lxc_list_init(&new->groups); |
d39b10eb | 2746 | lxc_list_init(&new->state_clients); |
fe4de9a6 DE |
2747 | new->lsm_aa_profile = NULL; |
2748 | new->lsm_se_context = NULL; | |
7a0bcca3 | 2749 | new->tmp_umount_proc = false; |
adf0ba1f LT |
2750 | new->lxc_shmount.path_host = NULL; |
2751 | new->lxc_shmount.path_cont = NULL; | |
7b379ab3 | 2752 | |
72bb04e4 PT |
2753 | /* if running in a new user namespace, init and COMMAND |
2754 | * default to running as UID/GID 0 when using lxc-execute */ | |
2755 | new->init_uid = 0; | |
2756 | new->init_gid = 0; | |
43654d34 | 2757 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2758 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2759 | |
7b379ab3 | 2760 | return new; |
089cd8b8 DL |
2761 | } |
2762 | ||
344c9d81 | 2763 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2764 | size_t buf_size) |
f6d3e3e4 | 2765 | { |
29053180 | 2766 | int fd, ret; |
0fd73091 | 2767 | char path[MAXPATHLEN]; |
f6d3e3e4 | 2768 | |
a19b974f CB |
2769 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2770 | size_t buflen; | |
2771 | ||
2772 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/setgroups", pid); | |
0fd73091 | 2773 | if (ret < 0 || ret >= MAXPATHLEN) |
a19b974f | 2774 | return -E2BIG; |
a19b974f CB |
2775 | |
2776 | fd = open(path, O_WRONLY); | |
2777 | if (fd < 0 && errno != ENOENT) { | |
2778 | SYSERROR("Failed to open \"%s\"", path); | |
2779 | return -1; | |
2780 | } | |
2781 | ||
2388737b CB |
2782 | if (fd >= 0) { |
2783 | buflen = sizeof("deny\n") - 1; | |
2784 | errno = 0; | |
2785 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
395b1a3e | 2786 | close(fd); |
2388737b | 2787 | if (ret != buflen) { |
0fd73091 CB |
2788 | SYSERROR("Failed to write \"deny\" to " |
2789 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2790 | return -1; |
2791 | } | |
395b1a3e | 2792 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2793 | } |
a19b974f CB |
2794 | } |
2795 | ||
29053180 CB |
2796 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
2797 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
0fd73091 | 2798 | if (ret < 0 || ret >= MAXPATHLEN) |
f6d3e3e4 | 2799 | return -E2BIG; |
29053180 CB |
2800 | |
2801 | fd = open(path, O_WRONLY); | |
2802 | if (fd < 0) { | |
a19b974f | 2803 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2804 | return -1; |
f6d3e3e4 | 2805 | } |
29053180 CB |
2806 | |
2807 | errno = 0; | |
2808 | ret = lxc_write_nointr(fd, buf, buf_size); | |
395b1a3e | 2809 | close(fd); |
29053180 | 2810 | if (ret != buf_size) { |
a19b974f | 2811 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2812 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2813 | return -1; |
2814 | } | |
29053180 CB |
2815 | |
2816 | return 0; | |
f6d3e3e4 SH |
2817 | } |
2818 | ||
6e50e704 CB |
2819 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2820 | * | |
2821 | * @return 1 if functional binary was found | |
2822 | * @return 0 if binary exists but is lacking privilege | |
2823 | * @return -ENOENT if binary does not exist | |
2824 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2825 | */ |
df6a2945 CB |
2826 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2827 | { | |
2828 | char *path; | |
2829 | int ret; | |
2830 | struct stat st; | |
2831 | int fret = 0; | |
2832 | ||
6e50e704 CB |
2833 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2834 | return -EINVAL; | |
2835 | ||
df6a2945 CB |
2836 | path = on_path(binary, NULL); |
2837 | if (!path) | |
2838 | return -ENOENT; | |
2839 | ||
2840 | ret = stat(path, &st); | |
2841 | if (ret < 0) { | |
2842 | fret = -errno; | |
2843 | goto cleanup; | |
2844 | } | |
2845 | ||
2846 | /* Check if the binary is setuid. */ | |
2847 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2848 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2849 | fret = 1; |
2850 | goto cleanup; | |
2851 | } | |
2852 | ||
0fd73091 | 2853 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2854 | /* Check if it has the CAP_SETUID capability. */ |
2855 | if ((cap & CAP_SETUID) && | |
2856 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2857 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2858 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2859 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2860 | fret = 1; |
2861 | goto cleanup; | |
2862 | } | |
2863 | ||
2864 | /* Check if it has the CAP_SETGID capability. */ | |
2865 | if ((cap & CAP_SETGID) && | |
2866 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2867 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2868 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2869 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2870 | fret = 1; |
2871 | goto cleanup; | |
2872 | } | |
0fd73091 | 2873 | #else |
69924fff CB |
2874 | /* If we cannot check for file capabilities we need to give the benefit |
2875 | * of the doubt. Otherwise we might fail even though all the necessary | |
2876 | * file capabilities are set. | |
2877 | */ | |
d6018f88 | 2878 | DEBUG("Cannot check for file capabilites as full capability support is " |
0fd73091 | 2879 | "missing. Manual intervention needed"); |
d6018f88 | 2880 | fret = 1; |
0fd73091 | 2881 | #endif |
df6a2945 CB |
2882 | |
2883 | cleanup: | |
2884 | free(path); | |
2885 | return fret; | |
2886 | } | |
2887 | ||
986ef930 CB |
2888 | int lxc_map_ids_exec_wrapper(void *args) |
2889 | { | |
2890 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2891 | return -1; | |
2892 | } | |
2893 | ||
f6d3e3e4 SH |
2894 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2895 | { | |
0fd73091 | 2896 | int fill, left; |
986ef930 | 2897 | char u_or_g; |
4bc3b759 | 2898 | char *pos; |
986ef930 | 2899 | char cmd_output[MAXPATHLEN]; |
0fd73091 CB |
2900 | struct id_map *map; |
2901 | struct lxc_list *iterator; | |
2902 | enum idtype type; | |
986ef930 CB |
2903 | /* strlen("new@idmap") = 9 |
2904 | * + | |
2905 | * strlen(" ") = 1 | |
2906 | * + | |
2907 | * LXC_NUMSTRLEN64 | |
2908 | * + | |
2909 | * strlen(" ") = 1 | |
2910 | * | |
2911 | * We add some additional space to make sure that we really have | |
2912 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2913 | */ | |
0fd73091 | 2914 | int ret = 0, gidmap = 0, uidmap = 0; |
986ef930 | 2915 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2916 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2917 | int hostuid, hostgid; |
2918 | ||
2919 | hostuid = geteuid(); | |
2920 | hostgid = getegid(); | |
df6a2945 CB |
2921 | |
2922 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2923 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2924 | * will protected it by preventing another user from being handed the |
2925 | * range by shadow. | |
2926 | */ | |
df6a2945 | 2927 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2928 | if (uidmap == -ENOENT) |
2929 | WARN("newuidmap binary is missing"); | |
2930 | else if (!uidmap) | |
2931 | WARN("newuidmap is lacking necessary privileges"); | |
2932 | ||
df6a2945 | 2933 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2934 | if (gidmap == -ENOENT) |
2935 | WARN("newgidmap binary is missing"); | |
2936 | else if (!gidmap) | |
2937 | WARN("newgidmap is lacking necessary privileges"); | |
2938 | ||
df6a2945 | 2939 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2940 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2941 | use_shadow = true; |
df6a2945 | 2942 | } else { |
99d43365 CB |
2943 | /* In case unprivileged users run application containers via |
2944 | * execute() or a start*() there are valid cases where they may | |
2945 | * only want to map their own {g,u}id. Let's not block them from | |
2946 | * doing so by requiring geteuid() == 0. | |
2947 | */ | |
2948 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2949 | "write directly with euid %d", hostuid); |
2950 | } | |
2951 | ||
2952 | /* Check if we really need to use newuidmap and newgidmap. | |
2953 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2954 | */ | |
2955 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2956 | use_shadow = false; | |
2957 | lxc_list_for_each(iterator, idmap) { | |
2958 | map = iterator->elem; | |
2959 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
2960 | map->nsid == hostuid && map->hostid == hostuid) | |
2961 | continue; | |
2962 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
2963 | map->nsid == hostgid && map->hostid == hostgid) | |
2964 | continue; | |
2965 | use_shadow = true; | |
2966 | break; | |
2967 | } | |
0e6e3a41 | 2968 | } |
251d0d2a | 2969 | |
986ef930 CB |
2970 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2971 | type++, u_or_g = 'g') { | |
2972 | pos = mapbuf; | |
2973 | ||
0e6e3a41 | 2974 | if (use_shadow) |
986ef930 | 2975 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2976 | |
cf3ef16d | 2977 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2978 | map = iterator->elem; |
cf3ef16d SH |
2979 | if (map->idtype != type) |
2980 | continue; | |
2981 | ||
4bc3b759 CB |
2982 | had_entry = true; |
2983 | ||
986ef930 | 2984 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2985 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2986 | use_shadow ? " " : "", map->nsid, |
2987 | map->hostid, map->range, | |
0e6e3a41 | 2988 | use_shadow ? "" : "\n"); |
a427e268 CB |
2989 | if (fill <= 0 || fill >= left) { |
2990 | /* The kernel only takes <= 4k for writes to | |
2991 | * /proc/<pid>/{g,u}id_map | |
2992 | */ | |
2993 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2994 | return -1; | |
2995 | } | |
4bc3b759 | 2996 | |
cf3ef16d | 2997 | pos += fill; |
251d0d2a | 2998 | } |
cf3ef16d | 2999 | if (!had_entry) |
4f7521b4 | 3000 | continue; |
cf3ef16d | 3001 | |
986ef930 CB |
3002 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
3003 | * easier. | |
3004 | */ | |
3005 | if (use_shadow) { | |
3006 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3007 | lxc_map_ids_exec_wrapper, | |
3008 | (void *)mapbuf); | |
3009 | if (ret < 0) { | |
54fbbeb5 CB |
3010 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3011 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3012 | return -1; |
3013 | } | |
54fbbeb5 | 3014 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3015 | } else { |
986ef930 | 3016 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3017 | if (ret < 0) { |
da0f9977 | 3018 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3019 | return -1; |
54fbbeb5 CB |
3020 | } |
3021 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3022 | } |
986ef930 CB |
3023 | |
3024 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3025 | } |
251d0d2a | 3026 | |
986ef930 | 3027 | return 0; |
f6d3e3e4 SH |
3028 | } |
3029 | ||
0fd73091 | 3030 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3031 | * Return true if id was found, false otherwise. |
cf3ef16d | 3032 | */ |
2a9a80cb | 3033 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3034 | unsigned long *val) |
cf3ef16d | 3035 | { |
4160c3a0 | 3036 | unsigned nsid; |
0fd73091 CB |
3037 | struct id_map *map; |
3038 | struct lxc_list *it; | |
4160c3a0 CB |
3039 | |
3040 | if (idtype == ID_TYPE_UID) | |
3041 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3042 | else | |
3043 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3044 | |
0fd73091 | 3045 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3046 | map = it->elem; |
7b50c609 | 3047 | if (map->idtype != idtype) |
cf3ef16d | 3048 | continue; |
4160c3a0 | 3049 | if (map->nsid != nsid) |
cf3ef16d | 3050 | continue; |
2a9a80cb SH |
3051 | *val = map->hostid; |
3052 | return true; | |
cf3ef16d | 3053 | } |
4160c3a0 | 3054 | |
2a9a80cb | 3055 | return false; |
cf3ef16d SH |
3056 | } |
3057 | ||
2133f58c | 3058 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3059 | { |
cf3ef16d | 3060 | struct id_map *map; |
0fd73091 CB |
3061 | struct lxc_list *it; |
3062 | ||
3063 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3064 | map = it->elem; |
2133f58c | 3065 | if (map->idtype != idtype) |
cf3ef16d | 3066 | continue; |
0fd73091 | 3067 | |
cf3ef16d | 3068 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3069 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3070 | } |
0fd73091 | 3071 | |
57d116ab | 3072 | return -1; |
cf3ef16d SH |
3073 | } |
3074 | ||
339efad9 | 3075 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3076 | { |
cf3ef16d | 3077 | struct id_map *map; |
0fd73091 | 3078 | struct lxc_list *it; |
2133f58c | 3079 | unsigned int freeid = 0; |
0fd73091 | 3080 | |
cf3ef16d | 3081 | again: |
0fd73091 | 3082 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3083 | map = it->elem; |
2133f58c | 3084 | if (map->idtype != idtype) |
cf3ef16d | 3085 | continue; |
0fd73091 | 3086 | |
cf3ef16d SH |
3087 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3088 | freeid = map->nsid + map->range; | |
3089 | goto again; | |
3090 | } | |
3091 | } | |
0fd73091 | 3092 | |
cf3ef16d SH |
3093 | return freeid; |
3094 | } | |
3095 | ||
f4f52cb5 CB |
3096 | int chown_mapped_root_exec_wrapper(void *args) |
3097 | { | |
3098 | execvp("lxc-usernsexec", args); | |
3099 | return -1; | |
3100 | } | |
3101 | ||
0fd73091 | 3102 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3103 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3104 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3105 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3106 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3107 | * him to do the chown. | |
f6d3e3e4 | 3108 | */ |
41dc7155 | 3109 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3110 | { |
f4f52cb5 | 3111 | uid_t rootuid, rootgid; |
2a9a80cb | 3112 | unsigned long val; |
f4f52cb5 CB |
3113 | int hostuid, hostgid, ret; |
3114 | struct stat sb; | |
3115 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3116 | char ugid[100]; | |
41dc7155 | 3117 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3118 | "-m", map1, |
3119 | "-m", map2, | |
3120 | "-m", map3, | |
3121 | "-m", map5, | |
3122 | "--", "chown", ugid, path, | |
3123 | NULL}; | |
41dc7155 | 3124 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3125 | "-m", map1, |
3126 | "-m", map2, | |
3127 | "-m", map3, | |
3128 | "-m", map4, | |
3129 | "-m", map5, | |
3130 | "--", "chown", ugid, path, | |
3131 | NULL}; | |
3132 | char cmd_output[MAXPATHLEN]; | |
3133 | ||
3134 | hostuid = geteuid(); | |
3135 | hostgid = getegid(); | |
f6d3e3e4 | 3136 | |
2a9a80cb | 3137 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3138 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3139 | return -1; |
f6d3e3e4 | 3140 | } |
f4f52cb5 | 3141 | rootuid = (uid_t)val; |
0fd73091 | 3142 | |
7b50c609 | 3143 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3144 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3145 | return -1; |
3146 | } | |
f4f52cb5 | 3147 | rootgid = (gid_t)val; |
2a9a80cb | 3148 | |
f4f52cb5 | 3149 | if (hostuid == 0) { |
7b50c609 | 3150 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3151 | ERROR("Error chowning %s", path); |
3152 | return -1; | |
3153 | } | |
0fd73091 | 3154 | |
c4d10a05 SH |
3155 | return 0; |
3156 | } | |
f3d7e4ca | 3157 | |
f4f52cb5 | 3158 | if (rootuid == hostuid) { |
1a0e70ac | 3159 | /* nothing to do */ |
b103ceac | 3160 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3161 | return 0; |
3162 | } | |
3163 | ||
bbdbf8f0 | 3164 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3165 | if (stat(path, &sb) < 0) { |
3166 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3167 | return -1; |
3168 | } | |
7b50c609 | 3169 | |
bbdbf8f0 CB |
3170 | /* Update the path argument in case this was overlayfs. */ |
3171 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3172 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3173 | ||
f4f52cb5 CB |
3174 | /* |
3175 | * A file has to be group-owned by a gid mapped into the | |
3176 | * container, or the container won't be privileged over it. | |
3177 | */ | |
3178 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3179 | if (sb.st_uid == hostuid && | |
3180 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3181 | chown(path, -1, hostgid) < 0) { | |
3182 | ERROR("Failed chgrping %s", path); | |
3183 | return -1; | |
3184 | } | |
f6d3e3e4 | 3185 | |
1a0e70ac | 3186 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3187 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3188 | if (ret < 0 || ret >= 100) { | |
3189 | ERROR("Error uid printing map string"); | |
3190 | return -1; | |
3191 | } | |
7b50c609 | 3192 | |
1a0e70ac | 3193 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3194 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3195 | if (ret < 0 || ret >= 100) { | |
3196 | ERROR("Error uid printing map string"); | |
3197 | return -1; | |
3198 | } | |
c4d10a05 | 3199 | |
1a0e70ac | 3200 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3201 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3202 | if (ret < 0 || ret >= 100) { | |
3203 | ERROR("Error gid printing map string"); | |
3204 | return -1; | |
3205 | } | |
98e5ba51 | 3206 | |
1a0e70ac | 3207 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3208 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3209 | rootgid + (gid_t)sb.st_gid); | |
3210 | if (ret < 0 || ret >= 100) { | |
3211 | ERROR("Error gid printing map string"); | |
3212 | return -1; | |
3213 | } | |
c4d10a05 | 3214 | |
1a0e70ac | 3215 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3216 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3217 | if (ret < 0 || ret >= 100) { | |
3218 | ERROR("Error gid printing map string"); | |
3219 | return -1; | |
3220 | } | |
7b50c609 | 3221 | |
1a0e70ac | 3222 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3223 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3224 | if (ret < 0 || ret >= 100) { | |
3225 | ERROR("Error owner printing format string for chown"); | |
3226 | return -1; | |
3227 | } | |
7b50c609 | 3228 | |
f4f52cb5 CB |
3229 | if (hostgid == sb.st_gid) |
3230 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3231 | chown_mapped_root_exec_wrapper, | |
3232 | (void *)args1); | |
3233 | else | |
3234 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3235 | chown_mapped_root_exec_wrapper, | |
3236 | (void *)args2); | |
3237 | if (ret < 0) | |
3238 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3239 | |
f4f52cb5 | 3240 | return ret; |
f6d3e3e4 SH |
3241 | } |
3242 | ||
943144d9 CB |
3243 | /* NOTE: Must not be called from inside the container namespace! */ |
3244 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3245 | { |
3246 | int mounted; | |
3247 | ||
943144d9 | 3248 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3249 | if (mounted == -1) { |
0fd73091 | 3250 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3251 | /* continue only if there is no rootfs */ |
943144d9 | 3252 | if (conf->rootfs.path) |
01958b1f | 3253 | return -1; |
5112cd70 | 3254 | } else if (mounted == 1) { |
7a0bcca3 | 3255 | conf->tmp_umount_proc = true; |
5112cd70 | 3256 | } |
943144d9 | 3257 | |
5112cd70 SH |
3258 | return 0; |
3259 | } | |
3260 | ||
3261 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3262 | { | |
7a0bcca3 | 3263 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3264 | return; |
3265 | ||
7a0bcca3 CB |
3266 | (void)umount2("/proc", MNT_DETACH); |
3267 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3268 | } |
3269 | ||
0fd73091 | 3270 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3271 | void remount_all_slave(void) |
e995d7a2 | 3272 | { |
6a49f05e CB |
3273 | int memfd, mntinfo_fd, ret; |
3274 | ssize_t copied; | |
0fd73091 | 3275 | FILE *f; |
e995d7a2 | 3276 | size_t len = 0; |
0fd73091 | 3277 | char *line = NULL; |
e995d7a2 | 3278 | |
6a49f05e | 3279 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3280 | if (mntinfo_fd < 0) { |
3281 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3282 | return; |
fea3b91d | 3283 | } |
6a49f05e CB |
3284 | |
3285 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3286 | if (memfd < 0) { | |
3287 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3288 | ||
3289 | if (errno != ENOSYS) { | |
fea3b91d | 3290 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e | 3291 | close(mntinfo_fd); |
6a49f05e CB |
3292 | return; |
3293 | } | |
3294 | ||
3295 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d DJ |
3296 | if (memfd < 0) { |
3297 | close(mntinfo_fd); | |
3298 | WARN("Failed to create temporary file"); | |
3299 | return; | |
3300 | } | |
6a49f05e CB |
3301 | } |
3302 | ||
3303 | #define __LXC_SENDFILE_MAX 0x7ffff000 /* maximum number of bytes sendfile can handle */ | |
3304 | again: | |
3305 | copied = sendfile(memfd, mntinfo_fd, NULL, __LXC_SENDFILE_MAX); | |
3306 | if (copied < 0) { | |
3307 | if (errno == EINTR) | |
3308 | goto again; | |
3309 | ||
fea3b91d | 3310 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3311 | close(mntinfo_fd); |
3312 | close(memfd); | |
6a49f05e CB |
3313 | return; |
3314 | } | |
3315 | close(mntinfo_fd); | |
3316 | ||
3317 | /* After a successful fdopen() memfd will be closed when calling | |
3318 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3319 | */ | |
3320 | ret = lseek(memfd, 0, SEEK_SET); | |
3321 | if (ret < 0) { | |
fea3b91d | 3322 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e | 3323 | close(memfd); |
6a49f05e CB |
3324 | return; |
3325 | } | |
3326 | ||
3327 | f = fdopen(memfd, "r"); | |
e995d7a2 | 3328 | if (!f) { |
fea3b91d DJ |
3329 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark " |
3330 | "all shared. Continuing"); | |
6a49f05e | 3331 | close(memfd); |
e995d7a2 SH |
3332 | return; |
3333 | } | |
3334 | ||
3335 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3336 | int ret; |
3337 | char *opts, *target; | |
3338 | ||
e995d7a2 SH |
3339 | target = get_field(line, 4); |
3340 | if (!target) | |
3341 | continue; | |
0fd73091 | 3342 | |
e995d7a2 SH |
3343 | opts = get_field(target, 2); |
3344 | if (!opts) | |
3345 | continue; | |
0fd73091 | 3346 | |
e995d7a2 SH |
3347 | null_endofword(opts); |
3348 | if (!strstr(opts, "shared")) | |
3349 | continue; | |
0fd73091 | 3350 | |
e995d7a2 | 3351 | null_endofword(target); |
0fd73091 CB |
3352 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3353 | if (ret < 0) { | |
3354 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3355 | ERROR("Continuing..."); |
6a49f05e | 3356 | continue; |
e995d7a2 | 3357 | } |
6a49f05e | 3358 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 SH |
3359 | } |
3360 | fclose(f); | |
f10fad2f | 3361 | free(line); |
6a49f05e | 3362 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3363 | } |
3364 | ||
794248d0 | 3365 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3366 | { |
3367 | int ret; | |
794248d0 CB |
3368 | char *p; |
3369 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3370 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3371 | |
3372 | /* If init exists in the container, don't bind mount a static one */ | |
3373 | p = choose_init(conf->rootfs.mount); | |
3374 | if (p) { | |
41089848 TA |
3375 | char *old = p; |
3376 | ||
3377 | p = strdup(old + strlen(conf->rootfs.mount)); | |
3378 | free(old); | |
3379 | if (!p) | |
3380 | return -ENOMEM; | |
3381 | ||
3382 | INFO("Found existing init at \"%s\"", p); | |
3383 | goto out; | |
9d9c111c | 3384 | } |
2322903b SH |
3385 | |
3386 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3387 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3388 | return -1; |
2322903b SH |
3389 | |
3390 | if (!file_exists(path)) { | |
0fd73091 | 3391 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3392 | return -1; |
2322903b SH |
3393 | } |
3394 | ||
794248d0 | 3395 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3396 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3397 | return -1; |
2322903b SH |
3398 | |
3399 | if (!file_exists(destpath)) { | |
794248d0 CB |
3400 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3401 | if (ret < 0 && errno != EEXIST) { | |
3402 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3403 | return -1; |
2322903b | 3404 | } |
2322903b SH |
3405 | } |
3406 | ||
592fd47a | 3407 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3408 | if (ret < 0) { |
0fd73091 | 3409 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3410 | return -1; |
3411 | } | |
3412 | ||
794248d0 CB |
3413 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3414 | if (!p) | |
3415 | return -ENOMEM; | |
794248d0 | 3416 | |
8353b4c9 | 3417 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3418 | out: |
4b5b3a2a | 3419 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3420 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3421 | return 0; |
2322903b SH |
3422 | } |
3423 | ||
0fd73091 CB |
3424 | /* This does the work of remounting / if it is shared, calling the container |
3425 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c SH |
3426 | */ |
3427 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3428 | { |
0fd73091 CB |
3429 | int ret; |
3430 | ||
35120d9c | 3431 | if (conf->rootfs_setup) { |
35120d9c | 3432 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3433 | |
3434 | /* The rootfs was set up in another namespace. bind-mount it to | |
3435 | * give us a mount in our own ns so we can pivot_root to it | |
3436 | */ | |
3437 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3438 | if (ret < 0) { | |
3439 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3440 | return -1; |
35120d9c | 3441 | } |
0fd73091 CB |
3442 | |
3443 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3444 | return 0; |
35120d9c | 3445 | } |
d4ef7c50 | 3446 | |
e995d7a2 SH |
3447 | remount_all_slave(); |
3448 | ||
0fd73091 CB |
3449 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3450 | if (ret < 0) { | |
3451 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3452 | return -1; |
3453 | } | |
3454 | ||
0fd73091 CB |
3455 | ret = lxc_setup_rootfs(conf); |
3456 | if (ret < 0) { | |
3457 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3458 | return -1; |
3459 | } | |
3460 | ||
3461 | conf->rootfs_setup = true; | |
3462 | return 0; | |
3463 | } | |
3464 | ||
1c1c7051 SH |
3465 | static bool verify_start_hooks(struct lxc_conf *conf) |
3466 | { | |
1c1c7051 | 3467 | char path[MAXPATHLEN]; |
0fd73091 CB |
3468 | struct lxc_list *it; |
3469 | ||
3470 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3471 | int ret; |
0fd73091 CB |
3472 | struct stat st; |
3473 | char *hookname = it->elem; | |
1c1c7051 SH |
3474 | |
3475 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
0fd73091 CB |
3476 | conf->rootfs.path ? conf->rootfs.mount : "", |
3477 | hookname); | |
1c1c7051 SH |
3478 | if (ret < 0 || ret >= MAXPATHLEN) |
3479 | return false; | |
0fd73091 | 3480 | |
1c1c7051 | 3481 | ret = stat(path, &st); |
0fd73091 | 3482 | if (ret < 0) { |
7b6753e7 | 3483 | SYSERROR("Start hook %s not found in container", |
0fd73091 | 3484 | hookname); |
1c1c7051 SH |
3485 | return false; |
3486 | } | |
0fd73091 | 3487 | |
6a0c909a | 3488 | return true; |
1c1c7051 SH |
3489 | } |
3490 | ||
3491 | return true; | |
3492 | } | |
3493 | ||
4b5b3a2a TA |
3494 | static bool execveat_supported(void) |
3495 | { | |
3496 | #ifdef __NR_execveat | |
3497 | /* | |
3498 | * We use the syscall here, because it was introduced in kernel 3.19, | |
3499 | * while glibc got support for using the syscall much later, in 2.27. | |
3500 | * We don't want to use glibc because it falls back to /proc, and the | |
3501 | * container may not have /proc mounted depending on its configuration. | |
3502 | */ | |
3503 | syscall(__NR_execveat, -1, "", NULL, NULL, AT_EMPTY_PATH); | |
3504 | if (errno == ENOSYS) | |
3505 | return false; | |
3506 | ||
3507 | return true; | |
3508 | #else | |
3509 | return false; | |
3510 | #endif | |
3511 | } | |
3512 | ||
3b988b33 | 3513 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3514 | { |
2187efd3 | 3515 | int ret; |
0fd73091 | 3516 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3517 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3518 | |
8353b4c9 CB |
3519 | ret = do_rootfs_setup(lxc_conf, name, lxcpath); |
3520 | if (ret < 0) { | |
3521 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3522 | return -1; |
3523 | } | |
3524 | ||
28d9e29e | 3525 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3526 | ret = setup_utsname(lxc_conf->utsname); |
3527 | if (ret < 0) { | |
0fd73091 | 3528 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3529 | return -1; |
3530 | } | |
0ad19a3f | 3531 | } |
3532 | ||
8353b4c9 CB |
3533 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3534 | if (ret < 0) { | |
3535 | ERROR("Failed to setup network"); | |
95b5ffaf | 3536 | return -1; |
0ad19a3f | 3537 | } |
3538 | ||
8353b4c9 CB |
3539 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3540 | if (ret < 0) { | |
3541 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3542 | return -1; |
3543 | } | |
3544 | ||
bc6928ff | 3545 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3546 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3547 | if (ret < 0) { | |
3548 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3549 | return -1; |
3550 | } | |
3551 | } | |
3552 | ||
8353b4c9 CB |
3553 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3554 | * need to wait until other stuff has finished. | |
368bbc02 | 3555 | */ |
8353b4c9 CB |
3556 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3557 | if (ret < 0) { | |
3558 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3559 | return -1; |
3560 | } | |
3561 | ||
8353b4c9 CB |
3562 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3563 | if (ret < 0) { | |
3564 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3565 | return -1; |
576f946d | 3566 | } |
3567 | ||
7b6753e7 | 3568 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3569 | if (!verify_start_hooks(lxc_conf)) |
3570 | return -1; | |
3571 | ||
8353b4c9 | 3572 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3573 | if (execveat_supported()) { |
3574 | int fd; | |
3575 | char path[PATH_MAX]; | |
3576 | ||
3577 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3578 | if (ret < 0 || ret >= PATH_MAX) { | |
3579 | ERROR("Path to init.lxc.static too long"); | |
3580 | return -1; | |
3581 | } | |
3582 | ||
3583 | fd = open(path, O_PATH | O_CLOEXEC); | |
3584 | if (fd < 0) { | |
3585 | SYSERROR("Unable to open lxc.init.static"); | |
3586 | return -1; | |
3587 | } | |
3588 | ||
3589 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3590 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3591 | } else { | |
3592 | ret = lxc_execute_bind_init(handler); | |
3593 | if (ret < 0) { | |
3594 | ERROR("Failed to bind-mount the lxc init system"); | |
3595 | return -1; | |
3596 | } | |
8353b4c9 CB |
3597 | } |
3598 | } | |
2322903b | 3599 | |
8353b4c9 CB |
3600 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3601 | * mounted. It is guaranteed to be mounted now either through | |
3602 | * automatically or via fstab entries. | |
368bbc02 | 3603 | */ |
8353b4c9 CB |
3604 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3605 | if (ret < 0) { | |
3606 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3607 | return -1; |
3608 | } | |
3609 | ||
8353b4c9 | 3610 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3611 | if (ret < 0) { |
8353b4c9 | 3612 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3613 | return -1; |
3614 | } | |
3615 | ||
bc6928ff | 3616 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3617 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3618 | if (ret < 0) { | |
3619 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3620 | return -1; |
3621 | } | |
06749971 | 3622 | |
8353b4c9 CB |
3623 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3624 | if (ret < 0) { | |
3625 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3626 | return -1; |
3627 | } | |
3628 | } | |
368bbc02 | 3629 | |
8353b4c9 CB |
3630 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3631 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3632 | &lxc_conf->mount_list, name, lxcpath); | |
3633 | if (ret < 0) { | |
3634 | ERROR("Failed to setup mount entries"); | |
3635 | return -1; | |
3636 | } | |
181437fd YT |
3637 | } |
3638 | ||
ed8704d0 | 3639 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3640 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3641 | if (ret < 0) { |
3642 | ERROR("Failed to setup console"); | |
95b5ffaf | 3643 | return -1; |
6e590161 | 3644 | } |
3645 | ||
ed8704d0 CB |
3646 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3647 | if (ret < 0) { | |
8353b4c9 | 3648 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3649 | return -1; |
3650 | } | |
3651 | ||
8353b4c9 CB |
3652 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3653 | if (ret < 0) { | |
3654 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3655 | return -1; |
e075f5d9 | 3656 | } |
e075f5d9 | 3657 | |
8353b4c9 CB |
3658 | ret = setup_pivot_root(&lxc_conf->rootfs); |
3659 | if (ret < 0) { | |
3660 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3661 | return -1; |
ed502555 | 3662 | } |
3663 | ||
8353b4c9 CB |
3664 | ret = lxc_setup_devpts(lxc_conf); |
3665 | if (ret < 0) { | |
3666 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3667 | return -1; |
3c26f34e | 3668 | } |
3669 | ||
2187efd3 CB |
3670 | ret = lxc_create_ttys(handler); |
3671 | if (ret < 0) | |
e8bd4e43 | 3672 | return -1; |
e8bd4e43 | 3673 | |
8353b4c9 CB |
3674 | ret = setup_personality(lxc_conf->personality); |
3675 | if (ret < 0) { | |
3676 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3677 | return -1; |
3678 | } | |
3679 | ||
8353b4c9 CB |
3680 | /* Set sysctl value to a path under /proc/sys as determined from the |
3681 | * key. For e.g. net.ipv4.ip_forward translated to | |
3682 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3683 | */ |
3684 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3685 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3686 | if (ret < 0) { |
3687 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3688 | return -1; |
8353b4c9 | 3689 | } |
7edd0540 L |
3690 | } |
3691 | ||
97a8f74f SG |
3692 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3693 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3694 | ERROR("Container requests lxc.cap.drop and " |
3695 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3696 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3697 | return -1; |
3698 | } | |
8353b4c9 | 3699 | |
97a8f74f | 3700 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3701 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3702 | return -1; |
3703 | } | |
3704 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3705 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3706 | return -1; |
81810dd1 DL |
3707 | } |
3708 | ||
8353b4c9 | 3709 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3710 | |
0ad19a3f | 3711 | return 0; |
3712 | } | |
26ddeedd | 3713 | |
3f60c2f7 | 3714 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3715 | char *argv[]) |
26ddeedd | 3716 | { |
26ddeedd | 3717 | struct lxc_list *it; |
3f60c2f7 | 3718 | int which = -1; |
26ddeedd | 3719 | |
3f60c2f7 | 3720 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3721 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3722 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3723 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3724 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3725 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3726 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3727 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3728 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3729 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3730 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3731 | which = LXCHOOK_START; |
3f60c2f7 | 3732 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3733 | which = LXCHOOK_STOP; |
3f60c2f7 | 3734 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3735 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3736 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3737 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3738 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3739 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3740 | else |
3741 | return -1; | |
3f60c2f7 | 3742 | |
0fd73091 | 3743 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3744 | int ret; |
3f60c2f7 CB |
3745 | char *hook = it->elem; |
3746 | ||
3747 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3748 | hookname, argv); |
3f60c2f7 CB |
3749 | if (ret < 0) |
3750 | return -1; | |
26ddeedd | 3751 | } |
3f60c2f7 | 3752 | |
26ddeedd SH |
3753 | return 0; |
3754 | } | |
72d0e1cb | 3755 | |
72d0e1cb SG |
3756 | int lxc_clear_config_caps(struct lxc_conf *c) |
3757 | { | |
1a0e70ac | 3758 | struct lxc_list *it, *next; |
72d0e1cb | 3759 | |
0fd73091 | 3760 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3761 | lxc_list_del(it); |
3762 | free(it->elem); | |
3763 | free(it); | |
3764 | } | |
0fd73091 | 3765 | |
72d0e1cb SG |
3766 | return 0; |
3767 | } | |
3768 | ||
c7e345ae CB |
3769 | static int lxc_free_idmap(struct lxc_list *id_map) |
3770 | { | |
27c27d73 SH |
3771 | struct lxc_list *it, *next; |
3772 | ||
0fd73091 | 3773 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3774 | lxc_list_del(it); |
3775 | free(it->elem); | |
3776 | free(it); | |
3777 | } | |
c7e345ae | 3778 | |
27c27d73 SH |
3779 | return 0; |
3780 | } | |
3781 | ||
4355ab5f SH |
3782 | int lxc_clear_idmaps(struct lxc_conf *c) |
3783 | { | |
3784 | return lxc_free_idmap(&c->id_map); | |
3785 | } | |
3786 | ||
1fb86a7c SH |
3787 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3788 | { | |
0fd73091 | 3789 | struct lxc_list *it, *next; |
1fb86a7c | 3790 | |
0fd73091 | 3791 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3792 | lxc_list_del(it); |
3793 | free(it->elem); | |
3794 | free(it); | |
3795 | } | |
0fd73091 | 3796 | |
1fb86a7c SH |
3797 | return 0; |
3798 | } | |
3799 | ||
54860ed0 | 3800 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3801 | { |
54860ed0 | 3802 | char *global_token, *namespaced_token; |
ab1a6cac | 3803 | size_t namespaced_token_len; |
54860ed0 | 3804 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3805 | const char *k = key; |
54860ed0 | 3806 | bool all = false; |
72d0e1cb | 3807 | |
54860ed0 CB |
3808 | if (version == CGROUP2_SUPER_MAGIC) { |
3809 | global_token = "lxc.cgroup2"; | |
3810 | namespaced_token = "lxc.cgroup2."; | |
0fd73091 | 3811 | namespaced_token_len = sizeof("lxc.cgroup2.") - 1; |
54860ed0 CB |
3812 | list = &c->cgroup2; |
3813 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3814 | global_token = "lxc.cgroup"; | |
3815 | namespaced_token = "lxc.cgroup."; | |
0fd73091 | 3816 | namespaced_token_len = sizeof("lxc.cgroup.") - 1; |
54860ed0 CB |
3817 | list = &c->cgroup; |
3818 | } else { | |
ab1a6cac | 3819 | return -EINVAL; |
54860ed0 CB |
3820 | } |
3821 | ||
3822 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3823 | all = true; |
54860ed0 | 3824 | else if (strncmp(key, namespaced_token, sizeof(namespaced_token) - 1) == 0) |
ab1a6cac | 3825 | k += namespaced_token_len; |
a6390f01 | 3826 | else |
ab1a6cac | 3827 | return -EINVAL; |
72d0e1cb | 3828 | |
0fd73091 | 3829 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3830 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3831 | |
72d0e1cb SG |
3832 | if (!all && strcmp(cg->subsystem, k) != 0) |
3833 | continue; | |
54860ed0 | 3834 | |
72d0e1cb SG |
3835 | lxc_list_del(it); |
3836 | free(cg->subsystem); | |
3837 | free(cg->value); | |
3838 | free(cg); | |
3839 | free(it); | |
3840 | } | |
e409b214 | 3841 | |
72d0e1cb SG |
3842 | return 0; |
3843 | } | |
3844 | ||
c6d09e15 WB |
3845 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3846 | { | |
3847 | struct lxc_list *it, *next; | |
c6d09e15 | 3848 | const char *k = NULL; |
0fd73091 | 3849 | bool all = false; |
c6d09e15 | 3850 | |
b668653c | 3851 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3852 | all = true; |
b668653c CB |
3853 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.") - 1) == 0) |
3854 | k = key + sizeof("lxc.limit.") - 1; | |
3855 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.") - 1) == 0) | |
3856 | k = key + sizeof("lxc.prlimit.") - 1; | |
c6d09e15 WB |
3857 | else |
3858 | return -1; | |
3859 | ||
0fd73091 | 3860 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3861 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3862 | |
c6d09e15 WB |
3863 | if (!all && strcmp(lim->resource, k) != 0) |
3864 | continue; | |
0fd73091 | 3865 | |
c6d09e15 WB |
3866 | lxc_list_del(it); |
3867 | free(lim->resource); | |
3868 | free(lim); | |
3869 | free(it); | |
3870 | } | |
b668653c | 3871 | |
c6d09e15 WB |
3872 | return 0; |
3873 | } | |
3874 | ||
7edd0540 L |
3875 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3876 | { | |
3877 | struct lxc_list *it, *next; | |
7edd0540 | 3878 | const char *k = NULL; |
0fd73091 | 3879 | bool all = false; |
7edd0540 L |
3880 | |
3881 | if (strcmp(key, "lxc.sysctl") == 0) | |
3882 | all = true; | |
3883 | else if (strncmp(key, "lxc.sysctl.", sizeof("lxc.sysctl.") - 1) == 0) | |
3884 | k = key + sizeof("lxc.sysctl.") - 1; | |
3885 | else | |
3886 | return -1; | |
3887 | ||
0fd73091 | 3888 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3889 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3890 | |
7edd0540 L |
3891 | if (!all && strcmp(elem->key, k) != 0) |
3892 | continue; | |
0fd73091 | 3893 | |
7edd0540 L |
3894 | lxc_list_del(it); |
3895 | free(elem->key); | |
3896 | free(elem->value); | |
3897 | free(elem); | |
3898 | free(it); | |
3899 | } | |
0fd73091 | 3900 | |
7edd0540 L |
3901 | return 0; |
3902 | } | |
3903 | ||
61d7a733 YT |
3904 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3905 | { | |
0fd73091 | 3906 | struct lxc_list *it, *next; |
61d7a733 | 3907 | const char *k = NULL; |
0fd73091 | 3908 | bool all = false; |
61d7a733 YT |
3909 | |
3910 | if (strcmp(key, "lxc.proc") == 0) | |
3911 | all = true; | |
3912 | else if (strncmp(key, "lxc.proc.", sizeof("lxc.proc.") - 1) == 0) | |
3913 | k = key + sizeof("lxc.proc.") - 1; | |
3914 | else | |
3915 | return -1; | |
3916 | ||
0fd73091 | 3917 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3918 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3919 | |
61d7a733 YT |
3920 | if (!all && strcmp(proc->filename, k) != 0) |
3921 | continue; | |
0fd73091 | 3922 | |
61d7a733 YT |
3923 | lxc_list_del(it); |
3924 | free(proc->filename); | |
3925 | free(proc->value); | |
3926 | free(proc); | |
3927 | free(it); | |
3928 | } | |
3929 | ||
3930 | return 0; | |
3931 | } | |
3932 | ||
ee1e7aa0 SG |
3933 | int lxc_clear_groups(struct lxc_conf *c) |
3934 | { | |
0fd73091 | 3935 | struct lxc_list *it, *next; |
ee1e7aa0 | 3936 | |
0fd73091 | 3937 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3938 | lxc_list_del(it); |
3939 | free(it->elem); | |
3940 | free(it); | |
3941 | } | |
0fd73091 | 3942 | |
ee1e7aa0 SG |
3943 | return 0; |
3944 | } | |
3945 | ||
ab799c0b SG |
3946 | int lxc_clear_environment(struct lxc_conf *c) |
3947 | { | |
0fd73091 | 3948 | struct lxc_list *it, *next; |
ab799c0b | 3949 | |
0fd73091 | 3950 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3951 | lxc_list_del(it); |
3952 | free(it->elem); | |
3953 | free(it); | |
3954 | } | |
0fd73091 | 3955 | |
ab799c0b SG |
3956 | return 0; |
3957 | } | |
3958 | ||
72d0e1cb SG |
3959 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3960 | { | |
0fd73091 | 3961 | struct lxc_list *it, *next; |
72d0e1cb | 3962 | |
0fd73091 | 3963 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3964 | lxc_list_del(it); |
3965 | free(it->elem); | |
3966 | free(it); | |
3967 | } | |
0fd73091 | 3968 | |
72d0e1cb SG |
3969 | return 0; |
3970 | } | |
3971 | ||
b099e9e9 SH |
3972 | int lxc_clear_automounts(struct lxc_conf *c) |
3973 | { | |
3974 | c->auto_mounts = 0; | |
3975 | return 0; | |
3976 | } | |
3977 | ||
12a50cc6 | 3978 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3979 | { |
72d0e1cb | 3980 | int i; |
0fd73091 CB |
3981 | struct lxc_list *it, *next; |
3982 | const char *k = NULL; | |
3983 | bool all = false, done = false; | |
72d0e1cb | 3984 | |
17ed13a3 SH |
3985 | if (strcmp(key, "lxc.hook") == 0) |
3986 | all = true; | |
0fd73091 CB |
3987 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.") - 1) == 0) |
3988 | k = key + sizeof("lxc.hook.") - 1; | |
a6390f01 WB |
3989 | else |
3990 | return -1; | |
17ed13a3 | 3991 | |
0fd73091 | 3992 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3993 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 3994 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
3995 | lxc_list_del(it); |
3996 | free(it->elem); | |
3997 | free(it); | |
3998 | } | |
0fd73091 | 3999 | |
17ed13a3 | 4000 | done = true; |
72d0e1cb SG |
4001 | } |
4002 | } | |
17ed13a3 SH |
4003 | |
4004 | if (!done) { | |
4005 | ERROR("Invalid hook key: %s", key); | |
4006 | return -1; | |
4007 | } | |
0fd73091 | 4008 | |
72d0e1cb SG |
4009 | return 0; |
4010 | } | |
8eb5694b | 4011 | |
4184c3e1 SH |
4012 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4013 | { | |
0fd73091 | 4014 | struct lxc_list *it, *next; |
4184c3e1 | 4015 | |
0fd73091 | 4016 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4017 | lxc_list_del(it); |
4018 | free(it->elem); | |
4019 | free(it); | |
4020 | } | |
4021 | } | |
4022 | ||
c7b15d1e | 4023 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4024 | { |
0fd73091 | 4025 | struct lxc_list *it, *next; |
f979ac15 | 4026 | |
0fd73091 | 4027 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4028 | lxc_list_del(it); |
4029 | free(it->elem); | |
4030 | free(it); | |
4031 | } | |
4032 | } | |
4033 | ||
8eb5694b SH |
4034 | void lxc_conf_free(struct lxc_conf *conf) |
4035 | { | |
4036 | if (!conf) | |
4037 | return; | |
0fd73091 | 4038 | |
858377e4 SH |
4039 | if (current_config == conf) |
4040 | current_config = NULL; | |
aed105d5 | 4041 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4042 | free(conf->rootfs.mount); |
b3b8c97f | 4043 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4044 | free(conf->rootfs.options); |
4045 | free(conf->rootfs.path); | |
f10fad2f | 4046 | free(conf->logfile); |
858377e4 SH |
4047 | if (conf->logfd != -1) |
4048 | close(conf->logfd); | |
f10fad2f | 4049 | free(conf->utsname); |
885766f5 CB |
4050 | free(conf->ttys.dir); |
4051 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4052 | free(conf->fstab); |
4053 | free(conf->rcfile); | |
5cda27c1 | 4054 | free(conf->execute_cmd); |
f10fad2f | 4055 | free(conf->init_cmd); |
3c491553 | 4056 | free(conf->init_cwd); |
6b0d5538 | 4057 | free(conf->unexpanded_config); |
76d0127f | 4058 | free(conf->syslog); |
c302b476 | 4059 | lxc_free_networks(&conf->network); |
f10fad2f ME |
4060 | free(conf->lsm_aa_profile); |
4061 | free(conf->lsm_se_context); | |
769872f9 | 4062 | lxc_seccomp_free(conf); |
8eb5694b | 4063 | lxc_clear_config_caps(conf); |
1fb86a7c | 4064 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4065 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4066 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4067 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4068 | lxc_clear_mount_entries(conf); |
27c27d73 | 4069 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4070 | lxc_clear_groups(conf); |
f979ac15 | 4071 | lxc_clear_includes(conf); |
761d81ca | 4072 | lxc_clear_aliens(conf); |
ab799c0b | 4073 | lxc_clear_environment(conf); |
240d4b74 | 4074 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4075 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4076 | lxc_clear_procs(conf, "lxc.proc"); |
43654d34 CB |
4077 | free(conf->cgroup_meta.dir); |
4078 | free(conf->cgroup_meta.controllers); | |
adf0ba1f LT |
4079 | free(conf->lxc_shmount.path_host); |
4080 | free(conf->lxc_shmount.path_cont); | |
8eb5694b SH |
4081 | free(conf); |
4082 | } | |
4355ab5f SH |
4083 | |
4084 | struct userns_fn_data { | |
4085 | int (*fn)(void *); | |
c9b7c33e | 4086 | const char *fn_name; |
4355ab5f SH |
4087 | void *arg; |
4088 | int p[2]; | |
4089 | }; | |
4090 | ||
4091 | static int run_userns_fn(void *data) | |
4092 | { | |
4355ab5f | 4093 | char c; |
0fd73091 | 4094 | struct userns_fn_data *d = data; |
4355ab5f | 4095 | |
f8aa4bf3 | 4096 | /* Close write end of the pipe. */ |
4355ab5f | 4097 | close(d->p[1]); |
f8aa4bf3 CB |
4098 | |
4099 | /* Wait for parent to finish establishing a new mapping in the user | |
4100 | * namespace we are executing in. | |
4101 | */ | |
489f39be | 4102 | if (lxc_read_nointr(d->p[0], &c, 1) != 1) |
4355ab5f | 4103 | return -1; |
f8aa4bf3 CB |
4104 | |
4105 | /* Close read end of the pipe. */ | |
4355ab5f | 4106 | close(d->p[0]); |
f8aa4bf3 | 4107 | |
c9b7c33e CB |
4108 | if (d->fn_name) |
4109 | TRACE("calling function \"%s\"", d->fn_name); | |
0fd73091 | 4110 | |
f8aa4bf3 | 4111 | /* Call function to run. */ |
4355ab5f SH |
4112 | return d->fn(d->arg); |
4113 | } | |
4114 | ||
db7cfe23 CB |
4115 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4116 | enum idtype idtype) | |
4117 | { | |
5173b710 CB |
4118 | const struct id_map *map; |
4119 | struct id_map *retmap; | |
db7cfe23 CB |
4120 | |
4121 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4122 | if (!map) | |
4123 | return NULL; | |
4124 | ||
4125 | retmap = malloc(sizeof(*retmap)); | |
4126 | if (!retmap) | |
4127 | return NULL; | |
4128 | ||
4129 | memcpy(retmap, map, sizeof(*retmap)); | |
4130 | return retmap; | |
4131 | } | |
4132 | ||
c4333195 CB |
4133 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4134 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4135 | { |
f8aa4bf3 | 4136 | struct id_map *map; |
0fd73091 | 4137 | struct lxc_list *it; |
f8aa4bf3 CB |
4138 | struct id_map *retmap = NULL; |
4139 | ||
0fd73091 | 4140 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4141 | map = it->elem; |
4142 | if (map->idtype != idtype) | |
4143 | continue; | |
4144 | ||
4145 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4146 | retmap = map; | |
4147 | break; | |
4148 | } | |
4149 | } | |
4150 | ||
f8aa4bf3 CB |
4151 | return retmap; |
4152 | } | |
4153 | ||
0fd73091 | 4154 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4155 | * existing one or establish a new one. |
4355ab5f | 4156 | */ |
0fd73091 CB |
4157 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4158 | enum idtype type) | |
4355ab5f | 4159 | { |
28a2d9e7 | 4160 | int hostid_mapped; |
c4333195 CB |
4161 | struct id_map *entry = NULL, *tmp = NULL; |
4162 | ||
4163 | entry = malloc(sizeof(*entry)); | |
4164 | if (!entry) | |
4165 | return NULL; | |
f8aa4bf3 | 4166 | |
28a2d9e7 | 4167 | /* Reuse existing mapping. */ |
c4333195 CB |
4168 | tmp = find_mapped_hostid_entry(conf, id, type); |
4169 | if (tmp) | |
4170 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4171 | |
28a2d9e7 CB |
4172 | /* Find new mapping. */ |
4173 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4174 | if (hostid_mapped < 0) { | |
c4333195 CB |
4175 | DEBUG("Failed to find free mapping for id %d", id); |
4176 | free(entry); | |
28a2d9e7 | 4177 | return NULL; |
f8aa4bf3 | 4178 | } |
f8aa4bf3 | 4179 | |
28a2d9e7 CB |
4180 | entry->idtype = type; |
4181 | entry->nsid = hostid_mapped; | |
4182 | entry->hostid = (unsigned long)id; | |
4183 | entry->range = 1; | |
4355ab5f | 4184 | |
28a2d9e7 | 4185 | return entry; |
4355ab5f SH |
4186 | } |
4187 | ||
dcf0ffdf | 4188 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4189 | { |
f8aa4bf3 | 4190 | uid_t euid, egid; |
4160c3a0 CB |
4191 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4192 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 4193 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
4194 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4195 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4196 | |
db7cfe23 | 4197 | /* Find container root mappings. */ |
4160c3a0 | 4198 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4199 | if (!container_root_uid) { |
dcf0ffdf | 4200 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 4201 | goto on_error; |
f8aa4bf3 | 4202 | } |
dcf0ffdf CB |
4203 | euid = geteuid(); |
4204 | if (euid >= container_root_uid->hostid && | |
4205 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4206 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4207 | |
4160c3a0 | 4208 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4209 | if (!container_root_gid) { |
dcf0ffdf | 4210 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
4211 | goto on_error; |
4212 | } | |
dcf0ffdf CB |
4213 | egid = getegid(); |
4214 | if (egid >= container_root_gid->hostid && | |
4215 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4216 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4217 | |
4218 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4219 | if (!host_uid_map) |
c4333195 | 4220 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4221 | if (!host_uid_map) { |
db7cfe23 | 4222 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
4223 | goto on_error; |
4224 | } | |
4225 | ||
dcf0ffdf CB |
4226 | if (!host_gid_map) |
4227 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4228 | if (!host_gid_map) { |
db7cfe23 | 4229 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
4230 | goto on_error; |
4231 | } | |
4232 | ||
4233 | /* Allocate new {g,u}id map list. */ | |
4234 | idmap = malloc(sizeof(*idmap)); | |
4235 | if (!idmap) | |
4236 | goto on_error; | |
4237 | lxc_list_init(idmap); | |
4238 | ||
f8aa4bf3 CB |
4239 | /* Add container root to the map. */ |
4240 | tmplist = malloc(sizeof(*tmplist)); | |
4241 | if (!tmplist) | |
4242 | goto on_error; | |
4243 | lxc_list_add_elem(tmplist, container_root_uid); | |
4244 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4245 | |
1d90e064 | 4246 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4247 | /* idmap will now keep track of that memory. */ |
4248 | container_root_uid = NULL; | |
4249 | ||
4250 | /* Add container root to the map. */ | |
4251 | tmplist = malloc(sizeof(*tmplist)); | |
4252 | if (!tmplist) | |
4253 | goto on_error; | |
4254 | lxc_list_add_elem(tmplist, host_uid_map); | |
4255 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4256 | } |
1d90e064 CB |
4257 | /* idmap will now keep track of that memory. */ |
4258 | container_root_uid = NULL; | |
4259 | /* idmap will now keep track of that memory. */ | |
4260 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4261 | |
4262 | tmplist = malloc(sizeof(*tmplist)); | |
4263 | if (!tmplist) | |
4264 | goto on_error; | |
4265 | lxc_list_add_elem(tmplist, container_root_gid); | |
4266 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4267 | |
1d90e064 | 4268 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4269 | /* idmap will now keep track of that memory. */ |
4270 | container_root_gid = NULL; | |
4271 | ||
4272 | tmplist = malloc(sizeof(*tmplist)); | |
4273 | if (!tmplist) | |
4274 | goto on_error; | |
4275 | lxc_list_add_elem(tmplist, host_gid_map); | |
4276 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4277 | } |
1d90e064 CB |
4278 | /* idmap will now keep track of that memory. */ |
4279 | container_root_gid = NULL; | |
4280 | /* idmap will now keep track of that memory. */ | |
4281 | host_gid_map = NULL; | |
f8aa4bf3 | 4282 | |
dcf0ffdf CB |
4283 | TRACE("Allocated minimal idmapping"); |
4284 | return idmap; | |
4285 | ||
4286 | on_error: | |
4dc41f99 | 4287 | if (idmap) { |
dcf0ffdf | 4288 | lxc_free_idmap(idmap); |
4dc41f99 SX |
4289 | free(idmap); |
4290 | } | |
dcf0ffdf CB |
4291 | if (container_root_uid) |
4292 | free(container_root_uid); | |
4293 | if (container_root_gid) | |
4294 | free(container_root_gid); | |
4295 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4296 | free(host_uid_map); | |
4297 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4298 | free(host_gid_map); | |
4299 | ||
4300 | return NULL; | |
4301 | } | |
4302 | ||
4303 | /* Run a function in a new user namespace. | |
4304 | * The caller's euid/egid will be mapped if it is not already. | |
4305 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4306 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4307 | * This means we require only to establish a mapping from: | |
4308 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4309 | * - the container root -> some sub{g,u}id | |
4310 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4311 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4312 | * there to start the container in the first place. | |
4313 | */ | |
4314 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4315 | const char *fn_name) | |
4316 | { | |
4317 | pid_t pid; | |
dcf0ffdf | 4318 | int p[2]; |
0fd73091 | 4319 | struct userns_fn_data d; |
dcf0ffdf | 4320 | struct lxc_list *idmap; |
0fd73091 CB |
4321 | int ret = -1, status = -1; |
4322 | char c = '1'; | |
dcf0ffdf | 4323 | |
2b2655a8 CB |
4324 | if (!conf) |
4325 | return -EINVAL; | |
4326 | ||
dcf0ffdf CB |
4327 | idmap = get_minimal_idmap(conf); |
4328 | if (!idmap) | |
4329 | return -1; | |
4330 | ||
4331 | ret = pipe(p); | |
4332 | if (ret < 0) { | |
4333 | SYSERROR("Failed to create pipe"); | |
4334 | return -1; | |
4335 | } | |
4336 | d.fn = fn; | |
4337 | d.fn_name = fn_name; | |
4338 | d.arg = data; | |
4339 | d.p[0] = p[0]; | |
4340 | d.p[1] = p[1]; | |
4341 | ||
4342 | /* Clone child in new user namespace. */ | |
4343 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4344 | if (pid < 0) { | |
0fd73091 | 4345 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4346 | goto on_error; |
4347 | } | |
4348 | ||
4349 | close(p[0]); | |
4350 | p[0] = -1; | |
4351 | ||
4b73005c CB |
4352 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4353 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4354 | struct id_map *map; |
0fd73091 | 4355 | struct lxc_list *it; |
dcf0ffdf | 4356 | |
0fd73091 | 4357 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4358 | map = it->elem; |
dcf0ffdf | 4359 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4360 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4361 | "%lu", |
4362 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4363 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4364 | } |
4355ab5f SH |
4365 | } |
4366 | ||
f8aa4bf3 | 4367 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4368 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4369 | if (ret < 0) { |
0fd73091 | 4370 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4371 | goto on_error; |
4355ab5f SH |
4372 | } |
4373 | ||
f8aa4bf3 | 4374 | /* Tell child to proceed. */ |
489f39be | 4375 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4376 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4377 | goto on_error; |
4355ab5f SH |
4378 | } |
4379 | ||
686dd5d1 | 4380 | on_error: |
4355ab5f SH |
4381 | if (p[0] != -1) |
4382 | close(p[0]); | |
4383 | close(p[1]); | |
f8aa4bf3 | 4384 | |
ee1b16bc TA |
4385 | /* Wait for child to finish. */ |
4386 | if (pid > 0) | |
4387 | status = wait_for_pid(pid); | |
4388 | ||
686dd5d1 CB |
4389 | if (status < 0) |
4390 | ret = -1; | |
4391 | ||
f8aa4bf3 | 4392 | return ret; |
4355ab5f | 4393 | } |
97e9cfa0 | 4394 | |
415a8851 CB |
4395 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4396 | const char *fn_name) | |
4397 | { | |
4398 | pid_t pid; | |
4399 | uid_t euid, egid; | |
415a8851 CB |
4400 | int p[2]; |
4401 | struct id_map *map; | |
4402 | struct lxc_list *cur; | |
0fd73091 | 4403 | struct userns_fn_data d; |
415a8851 | 4404 | int ret = -1; |
0fd73091 | 4405 | char c = '1'; |
415a8851 CB |
4406 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4407 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4408 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4409 | ||
2b2655a8 CB |
4410 | if (!conf) |
4411 | return -EINVAL; | |
4412 | ||
415a8851 CB |
4413 | ret = pipe(p); |
4414 | if (ret < 0) { | |
4415 | SYSERROR("opening pipe"); | |
4416 | return -1; | |
4417 | } | |
4418 | d.fn = fn; | |
4419 | d.fn_name = fn_name; | |
4420 | d.arg = data; | |
4421 | d.p[0] = p[0]; | |
4422 | d.p[1] = p[1]; | |
4423 | ||
4424 | /* Clone child in new user namespace. */ | |
4425 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4426 | if (pid < 0) { | |
0fd73091 | 4427 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4428 | goto on_error; |
4429 | } | |
4430 | ||
4431 | close(p[0]); | |
4432 | p[0] = -1; | |
4433 | ||
4434 | euid = geteuid(); | |
4435 | egid = getegid(); | |
4436 | ||
4437 | /* Allocate new {g,u}id map list. */ | |
4438 | idmap = malloc(sizeof(*idmap)); | |
4439 | if (!idmap) | |
4440 | goto on_error; | |
4441 | lxc_list_init(idmap); | |
4442 | ||
4443 | /* Find container root. */ | |
0fd73091 | 4444 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4445 | struct id_map *tmpmap; |
4446 | ||
4447 | tmplist = malloc(sizeof(*tmplist)); | |
4448 | if (!tmplist) | |
4449 | goto on_error; | |
4450 | ||
4451 | tmpmap = malloc(sizeof(*tmpmap)); | |
4452 | if (!tmpmap) { | |
4453 | free(tmplist); | |
4454 | goto on_error; | |
4455 | } | |
4456 | ||
4457 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4458 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4459 | tmplist->elem = tmpmap; | |
4460 | ||
4461 | lxc_list_add_tail(idmap, tmplist); | |
4462 | ||
4463 | map = cur->elem; | |
4464 | ||
4465 | if (map->idtype == ID_TYPE_UID) | |
4466 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4467 | host_uid_map = map; | |
4468 | ||
4469 | if (map->idtype == ID_TYPE_GID) | |
4470 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4471 | host_gid_map = map; | |
4472 | ||
4473 | if (map->nsid != 0) | |
4474 | continue; | |
4475 | ||
4476 | if (map->idtype == ID_TYPE_UID) | |
4477 | if (container_root_uid == NULL) | |
4478 | container_root_uid = map; | |
4479 | ||
4480 | if (map->idtype == ID_TYPE_GID) | |
4481 | if (container_root_gid == NULL) | |
4482 | container_root_gid = map; | |
4483 | } | |
4484 | ||
4485 | if (!container_root_uid || !container_root_gid) { | |
4486 | ERROR("No mapping for container root found"); | |
4487 | goto on_error; | |
4488 | } | |
4489 | ||
4490 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4491 | if (!host_uid_map) | |
c4333195 | 4492 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4493 | else |
4494 | host_uid_map = container_root_uid; | |
4495 | ||
4496 | if (!host_gid_map) | |
c4333195 | 4497 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4498 | else |
4499 | host_gid_map = container_root_gid; | |
4500 | ||
4501 | if (!host_uid_map) { | |
4502 | DEBUG("Failed to find mapping for uid %d", euid); | |
4503 | goto on_error; | |
4504 | } | |
4505 | ||
4506 | if (!host_gid_map) { | |
4507 | DEBUG("Failed to find mapping for gid %d", egid); | |
4508 | goto on_error; | |
4509 | } | |
4510 | ||
4511 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4512 | /* Add container root to the map. */ | |
4513 | tmplist = malloc(sizeof(*tmplist)); | |
4514 | if (!tmplist) | |
4515 | goto on_error; | |
4516 | lxc_list_add_elem(tmplist, host_uid_map); | |
4517 | lxc_list_add_tail(idmap, tmplist); | |
4518 | } | |
4519 | /* idmap will now keep track of that memory. */ | |
4520 | host_uid_map = NULL; | |
4521 | ||
4522 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4523 | tmplist = malloc(sizeof(*tmplist)); | |
4524 | if (!tmplist) | |
4525 | goto on_error; | |
4526 | lxc_list_add_elem(tmplist, host_gid_map); | |
4527 | lxc_list_add_tail(idmap, tmplist); | |
4528 | } | |
4529 | /* idmap will now keep track of that memory. */ | |
4530 | host_gid_map = NULL; | |
4531 | ||
4532 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4533 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4534 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4535 | map = cur->elem; |
4536 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4537 | "user namespace: nsuid %lu - hostid %lu - range " | |
4538 | "%lu", | |
4539 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4540 | map->nsid, map->hostid, map->range); | |
4541 | } | |
4542 | } | |
4543 | ||
4544 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4545 | ret = lxc_map_ids(idmap, pid); | |
4546 | if (ret < 0) { | |
0fd73091 | 4547 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4548 | goto on_error; |
4549 | } | |
4550 | ||
4551 | /* Tell child to proceed. */ | |
489f39be | 4552 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4553 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4554 | goto on_error; |
4555 | } | |
4556 | ||
686dd5d1 | 4557 | on_error: |
ee1b16bc TA |
4558 | if (p[0] != -1) |
4559 | close(p[0]); | |
4560 | close(p[1]); | |
4561 | ||
415a8851 | 4562 | /* Wait for child to finish. */ |
686dd5d1 CB |
4563 | if (pid > 0) |
4564 | ret = wait_for_pid(pid); | |
415a8851 | 4565 | |
80758b4b | 4566 | if (idmap) { |
415a8851 | 4567 | lxc_free_idmap(idmap); |
80758b4b DJ |
4568 | free(idmap); |
4569 | } | |
4570 | ||
415a8851 CB |
4571 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4572 | free(host_uid_map); | |
4573 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4574 | free(host_gid_map); | |
4575 | ||
415a8851 CB |
4576 | return ret; |
4577 | } | |
4578 | ||
a96a8e8c | 4579 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4580 | static char *getuname(void) |
97e9cfa0 | 4581 | { |
cb7aa5e8 DJ |
4582 | struct passwd pwent; |
4583 | struct passwd *pwentp = NULL; | |
4584 | char *buf; | |
4585 | char *username; | |
4586 | size_t bufsize; | |
4587 | int ret; | |
97e9cfa0 | 4588 | |
cb7aa5e8 DJ |
4589 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4590 | if (bufsize == -1) | |
4591 | bufsize = 1024; | |
4592 | ||
4593 | buf = malloc(bufsize); | |
4594 | if (!buf) | |
97e9cfa0 SH |
4595 | return NULL; |
4596 | ||
cb7aa5e8 DJ |
4597 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4598 | if (!pwentp) { | |
4599 | if (ret == 0) | |
4600 | WARN("Could not find matched password record."); | |
4601 | ||
4602 | ERROR("Failed to get password record - %u", geteuid()); | |
4603 | free(buf); | |
4604 | return NULL; | |
4605 | } | |
4606 | ||
4607 | username = strdup(pwent.pw_name); | |
4608 | free(buf); | |
4609 | ||
4610 | return username; | |
97e9cfa0 SH |
4611 | } |
4612 | ||
a96a8e8c | 4613 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4614 | static char *getgname(void) |
4615 | { | |
3de9fb4c DJ |
4616 | struct group grent; |
4617 | struct group *grentp = NULL; | |
4618 | char *buf; | |
4619 | char *grname; | |
4620 | size_t bufsize; | |
4621 | int ret; | |
4622 | ||
4623 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4624 | if (bufsize == -1) | |
4625 | bufsize = 1024; | |
4626 | ||
4627 | buf = malloc(bufsize); | |
4628 | if (!buf) | |
4629 | return NULL; | |
4630 | ||
4631 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4632 | if (!grentp) { | |
4633 | if (ret == 0) | |
4634 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4635 | |
3de9fb4c DJ |
4636 | ERROR("Failed to get group record - %u", getegid()); |
4637 | free(buf); | |
97e9cfa0 | 4638 | return NULL; |
3de9fb4c DJ |
4639 | } |
4640 | ||
4641 | grname = strdup(grent.gr_name); | |
4642 | free(buf); | |
97e9cfa0 | 4643 | |
3de9fb4c | 4644 | return grname; |
97e9cfa0 SH |
4645 | } |
4646 | ||
a96a8e8c | 4647 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4648 | void suggest_default_idmap(void) |
4649 | { | |
0fd73091 | 4650 | char *uname, *gname; |
97e9cfa0 SH |
4651 | FILE *f; |
4652 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4653 | size_t len = 0; |
0fd73091 | 4654 | char *line = NULL; |
97e9cfa0 | 4655 | |
0fd73091 CB |
4656 | uname = getuname(); |
4657 | if (!uname) | |
97e9cfa0 SH |
4658 | return; |
4659 | ||
0fd73091 CB |
4660 | gname = getgname(); |
4661 | if (!gname) { | |
97e9cfa0 SH |
4662 | free(uname); |
4663 | return; | |
4664 | } | |
4665 | ||
4666 | f = fopen(subuidfile, "r"); | |
4667 | if (!f) { | |
4668 | ERROR("Your system is not configured with subuids"); | |
4669 | free(gname); | |
4670 | free(uname); | |
4671 | return; | |
4672 | } | |
0fd73091 | 4673 | |
97e9cfa0 | 4674 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4675 | char *p, *p2; |
b7930180 | 4676 | size_t no_newline = 0; |
0fd73091 CB |
4677 | |
4678 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4679 | if (*line == '#') |
4680 | continue; | |
4681 | if (!p) | |
4682 | continue; | |
4683 | *p = '\0'; | |
4684 | p++; | |
0fd73091 | 4685 | |
97e9cfa0 SH |
4686 | if (strcmp(line, uname)) |
4687 | continue; | |
0fd73091 | 4688 | |
97e9cfa0 SH |
4689 | p2 = strchr(p, ':'); |
4690 | if (!p2) | |
4691 | continue; | |
4692 | *p2 = '\0'; | |
4693 | p2++; | |
4694 | if (!*p2) | |
4695 | continue; | |
b7930180 CB |
4696 | no_newline = strcspn(p2, "\n"); |
4697 | p2[no_newline] = '\0'; | |
4698 | ||
b7b2fde4 | 4699 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4700 | WARN("Could not parse UID"); |
b7b2fde4 | 4701 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4702 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4703 | } |
4704 | fclose(f); | |
4705 | ||
6be7389a | 4706 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4707 | if (!f) { |
4708 | ERROR("Your system is not configured with subgids"); | |
4709 | free(gname); | |
4710 | free(uname); | |
4711 | return; | |
4712 | } | |
0fd73091 | 4713 | |
97e9cfa0 | 4714 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4715 | char *p, *p2; |
b7930180 | 4716 | size_t no_newline = 0; |
0fd73091 CB |
4717 | |
4718 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4719 | if (*line == '#') |
4720 | continue; | |
4721 | if (!p) | |
4722 | continue; | |
4723 | *p = '\0'; | |
4724 | p++; | |
0fd73091 | 4725 | |
97e9cfa0 SH |
4726 | if (strcmp(line, uname)) |
4727 | continue; | |
0fd73091 | 4728 | |
97e9cfa0 SH |
4729 | p2 = strchr(p, ':'); |
4730 | if (!p2) | |
4731 | continue; | |
4732 | *p2 = '\0'; | |
4733 | p2++; | |
4734 | if (!*p2) | |
4735 | continue; | |
b7930180 CB |
4736 | no_newline = strcspn(p2, "\n"); |
4737 | p2[no_newline] = '\0'; | |
4738 | ||
b7b2fde4 | 4739 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4740 | WARN("Could not parse GID"); |
b7b2fde4 | 4741 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4742 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4743 | } |
4744 | fclose(f); | |
4745 | ||
f10fad2f | 4746 | free(line); |
97e9cfa0 SH |
4747 | |
4748 | if (!urange || !grange) { | |
4749 | ERROR("You do not have subuids or subgids allocated"); | |
4750 | ERROR("Unprivileged containers require subuids and subgids"); | |
fbd4a4d1 | 4751 | free(uname); |
1e7cd2f7 | 4752 | free(gname); |
97e9cfa0 SH |
4753 | return; |
4754 | } | |
4755 | ||
4756 | ERROR("You must either run as root, or define uid mappings"); | |
4757 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4758 | ERROR("~/.config/lxc/default.conf:"); | |
4759 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4760 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4761 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4762 | |
4763 | free(gname); | |
4764 | free(uname); | |
4765 | } | |
aaf26830 | 4766 | |
a7307747 SH |
4767 | static void free_cgroup_settings(struct lxc_list *result) |
4768 | { | |
4769 | struct lxc_list *iterator, *next; | |
4770 | ||
0fd73091 | 4771 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4772 | lxc_list_del(iterator); |
4773 | free(iterator); | |
4774 | } | |
4775 | free(result); | |
4776 | } | |
4777 | ||
0fd73091 | 4778 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4779 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4780 | */ | |
0fd73091 | 4781 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4782 | { |
4783 | struct lxc_list *result; | |
aaf26830 | 4784 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4785 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4786 | |
4787 | result = malloc(sizeof(*result)); | |
0fd73091 | 4788 | if (!result) |
fac7c663 | 4789 | return NULL; |
aaf26830 KT |
4790 | lxc_list_init(result); |
4791 | ||
0fd73091 CB |
4792 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4793 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4794 | item = malloc(sizeof(*item)); |
fac7c663 | 4795 | if (!item) { |
a7307747 | 4796 | free_cgroup_settings(result); |
fac7c663 KT |
4797 | return NULL; |
4798 | } | |
0fd73091 | 4799 | |
aaf26830 KT |
4800 | item->elem = it->elem; |
4801 | cg = it->elem; | |
4802 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4803 | /* Store the memsw_limit location */ | |
4804 | memsw_limit = item; | |
0fd73091 CB |
4805 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4806 | memsw_limit != NULL) { | |
4807 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4808 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4809 | * two items */ | |
aaf26830 KT |
4810 | item->elem = memsw_limit->elem; |
4811 | memsw_limit->elem = it->elem; | |
4812 | } | |
4813 | lxc_list_add_tail(result, item); | |
4814 | } | |
4815 | ||
4816 | return result; | |
a7307747 | 4817 | } |