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