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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 | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
f549edcc GK |
24 | #include "config.h" |
25 | ||
0ad19a3f | 26 | #include <stdio.h> |
27 | #undef _GNU_SOURCE | |
28 | #include <string.h> | |
29 | #include <stdlib.h> | |
30 | #include <dirent.h> | |
31 | #include <errno.h> | |
32 | #include <unistd.h> | |
33 | #include <signal.h> | |
b0a33c1e | 34 | #include <fcntl.h> |
35 | #include <termios.h> | |
0ad19a3f | 36 | #include <sys/param.h> |
37 | #include <sys/file.h> | |
f4d507d5 | 38 | #include <sys/mount.h> |
b4f8660e | 39 | #include <sys/stat.h> |
0ad19a3f | 40 | #include <sys/types.h> |
8173e600 | 41 | #include <sys/socket.h> |
0ad19a3f | 42 | #include <sys/prctl.h> |
ddceb1f9 | 43 | #include <sys/types.h> |
0ad19a3f | 44 | #include <sys/wait.h> |
b0a33c1e | 45 | #include <sys/un.h> |
46 | #include <sys/poll.h> | |
8173e600 | 47 | #include <sys/syscall.h> |
ff218c25 | 48 | |
495d2046 SG |
49 | #if HAVE_SYS_CAPABILITY_H |
50 | #include <sys/capability.h> | |
51 | #endif | |
52 | ||
656994bb MH |
53 | #if !HAVE_DECL_PR_CAPBSET_DROP |
54 | #define PR_CAPBSET_DROP 24 | |
55 | #endif | |
56 | ||
63376d7d DL |
57 | #include "start.h" |
58 | #include "conf.h" | |
59 | #include "log.h" | |
563f2f2c | 60 | #include "cgroup.h" |
e2bcd7db | 61 | #include "error.h" |
b0a33c1e | 62 | #include "af_unix.h" |
63 | #include "mainloop.h" | |
63376d7d | 64 | #include "utils.h" |
565c2d76 | 65 | #include "lxcutmp.h" |
63376d7d | 66 | #include "monitor.h" |
96fa1ff0 | 67 | #include "commands.h" |
63376d7d | 68 | #include "console.h" |
3c22086f | 69 | #include "sync.h" |
f549edcc | 70 | #include "namespace.h" |
e075f5d9 | 71 | #include "apparmor.h" |
0d0527a9 | 72 | #include "lxcseccomp.h" |
8173e600 | 73 | #include "caps.h" |
36eb9bde CLG |
74 | |
75 | lxc_log_define(lxc_start, lxc); | |
76 | ||
80090207 CLG |
77 | static int match_fd(int fd) |
78 | { | |
79 | return (fd == 0 || fd == 1 || fd == 2); | |
80 | } | |
81 | ||
b119f362 | 82 | int lxc_check_inherited(struct lxc_conf *conf, int fd_to_ignore) |
80090207 CLG |
83 | { |
84 | struct dirent dirent, *direntp; | |
85 | int fd, fddir; | |
86 | DIR *dir; | |
80090207 | 87 | |
b119f362 | 88 | restart: |
80090207 CLG |
89 | dir = opendir("/proc/self/fd"); |
90 | if (!dir) { | |
91 | WARN("failed to open directory: %m"); | |
92 | return -1; | |
93 | } | |
94 | ||
95 | fddir = dirfd(dir); | |
96 | ||
97 | while (!readdir_r(dir, &dirent, &direntp)) { | |
80090207 CLG |
98 | if (!direntp) |
99 | break; | |
100 | ||
101 | if (!strcmp(direntp->d_name, ".")) | |
102 | continue; | |
103 | ||
104 | if (!strcmp(direntp->d_name, "..")) | |
105 | continue; | |
106 | ||
107 | fd = atoi(direntp->d_name); | |
108 | ||
f2faa8fa | 109 | if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore) |
80090207 CLG |
110 | continue; |
111 | ||
112 | if (match_fd(fd)) | |
113 | continue; | |
80090207 | 114 | |
b119f362 SH |
115 | if (conf->close_all_fds) { |
116 | close(fd); | |
117 | closedir(dir); | |
118 | INFO("closed inherited fd %d", fd); | |
119 | goto restart; | |
120 | } | |
92c7f629 | 121 | WARN("inherited fd %d", fd); |
80090207 CLG |
122 | } |
123 | ||
92c7f629 GK |
124 | closedir(dir); /* cannot fail */ |
125 | return 0; | |
80090207 CLG |
126 | } |
127 | ||
83ee7875 | 128 | static int setup_signal_fd(sigset_t *oldmask) |
b0a33c1e | 129 | { |
130 | sigset_t mask; | |
131 | int fd; | |
132 | ||
f3304a29 FW |
133 | /* Block everything except serious error signals */ |
134 | if (sigfillset(&mask) || | |
135 | sigdelset(&mask, SIGILL) || | |
136 | sigdelset(&mask, SIGSEGV) || | |
137 | sigdelset(&mask, SIGBUS) || | |
b5159817 | 138 | sigdelset(&mask, SIGWINCH) || |
f3304a29 FW |
139 | sigprocmask(SIG_BLOCK, &mask, oldmask)) { |
140 | SYSERROR("failed to set signal mask"); | |
b0a33c1e | 141 | return -1; |
142 | } | |
143 | ||
144 | fd = signalfd(-1, &mask, 0); | |
145 | if (fd < 0) { | |
36eb9bde | 146 | SYSERROR("failed to create the signal fd"); |
b0a33c1e | 147 | return -1; |
148 | } | |
149 | ||
150 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { | |
36eb9bde | 151 | SYSERROR("failed to set sigfd to close-on-exec"); |
b0a33c1e | 152 | close(fd); |
153 | return -1; | |
154 | } | |
155 | ||
1ac470c0 DL |
156 | DEBUG("sigchild handler set"); |
157 | ||
b0a33c1e | 158 | return fd; |
159 | } | |
160 | ||
83ee7875 | 161 | static int signal_handler(int fd, void *data, |
b0a33c1e | 162 | struct lxc_epoll_descr *descr) |
163 | { | |
15cd25fd DL |
164 | struct signalfd_siginfo siginfo; |
165 | int ret; | |
82d89dce | 166 | pid_t *pid = data; |
15cd25fd DL |
167 | |
168 | ret = read(fd, &siginfo, sizeof(siginfo)); | |
169 | if (ret < 0) { | |
f3304a29 | 170 | ERROR("failed to read signal info"); |
15cd25fd DL |
171 | return -1; |
172 | } | |
173 | ||
174 | if (ret != sizeof(siginfo)) { | |
175 | ERROR("unexpected siginfo size"); | |
176 | return -1; | |
177 | } | |
178 | ||
f3304a29 FW |
179 | if (siginfo.ssi_signo != SIGCHLD) { |
180 | kill(*pid, siginfo.ssi_signo); | |
181 | INFO("forwarded signal %d to pid %d", siginfo.ssi_signo, *pid); | |
182 | return 0; | |
183 | } | |
184 | ||
15cd25fd DL |
185 | if (siginfo.ssi_code == CLD_STOPPED || |
186 | siginfo.ssi_code == CLD_CONTINUED) { | |
187 | INFO("container init process was stopped/continued"); | |
188 | return 0; | |
189 | } | |
1ac470c0 | 190 | |
82d89dce DL |
191 | /* more robustness, protect ourself from a SIGCHLD sent |
192 | * by a process different from the container init | |
193 | */ | |
194 | if (siginfo.ssi_pid != *pid) { | |
195 | WARN("invalid pid for SIGCHLD"); | |
196 | return 0; | |
197 | } | |
198 | ||
15cd25fd | 199 | DEBUG("container init process exited"); |
b0a33c1e | 200 | return 1; |
201 | } | |
202 | ||
25c2aca5 | 203 | int lxc_set_state(const char *name, struct lxc_handler *handler, lxc_state_t state) |
66aeffc7 DL |
204 | { |
205 | handler->state = state; | |
9123e471 | 206 | lxc_monitor_send_state(name, state, handler->lxcpath); |
66aeffc7 DL |
207 | return 0; |
208 | } | |
209 | ||
1bc5cc8c | 210 | int lxc_poll(const char *name, struct lxc_handler *handler) |
b0a33c1e | 211 | { |
ca5f7926 DL |
212 | int sigfd = handler->sigfd; |
213 | int pid = handler->pid; | |
b0a33c1e | 214 | struct lxc_epoll_descr descr; |
215 | ||
a9e61274 | 216 | if (lxc_mainloop_open(&descr)) { |
36eb9bde | 217 | ERROR("failed to create mainloop"); |
50c8bf05 | 218 | goto out_sigfd; |
b0a33c1e | 219 | } |
220 | ||
83ee7875 | 221 | if (lxc_mainloop_add_handler(&descr, sigfd, signal_handler, &pid)) { |
36eb9bde | 222 | ERROR("failed to add handler for the signal"); |
b0a33c1e | 223 | goto out_mainloop_open; |
224 | } | |
225 | ||
63376d7d DL |
226 | if (lxc_console_mainloop_add(&descr, handler)) { |
227 | ERROR("failed to add console handler to mainloop"); | |
228 | goto out_mainloop_open; | |
229 | } | |
230 | ||
ef6e34ee | 231 | if (lxc_cmd_mainloop_add(name, &descr, handler)) { |
563f2f2c | 232 | ERROR("failed to add command handler to mainloop"); |
96fa1ff0 | 233 | goto out_mainloop_open; |
563f2f2c DL |
234 | } |
235 | ||
828695d9 | 236 | if (handler->conf->need_utmp_watch) { |
495d2046 | 237 | #if HAVE_SYS_CAPABILITY_H |
828695d9 SH |
238 | if (lxc_utmp_mainloop_add(&descr, handler)) { |
239 | ERROR("failed to add utmp handler to mainloop"); | |
240 | goto out_mainloop_open; | |
241 | } | |
495d2046 SG |
242 | #else |
243 | DEBUG("not starting utmp handler as cap_sys_boot cannot be dropped without capabilities support\n"); | |
244 | #endif | |
563f2f2c | 245 | } |
b0a33c1e | 246 | |
e51d4895 | 247 | return lxc_mainloop(&descr, -1); |
b0a33c1e | 248 | |
249 | out_mainloop_open: | |
250 | lxc_mainloop_close(&descr); | |
b0a33c1e | 251 | out_sigfd: |
252 | close(sigfd); | |
c3e13372 | 253 | return -1; |
b0a33c1e | 254 | } |
255 | ||
4a2ca8b2 SH |
256 | extern int lxc_caps_check(void); |
257 | ||
13f5be62 | 258 | struct lxc_handler *lxc_init(const char *name, struct lxc_conf *conf, const char *lxcpath) |
59eb99ba | 259 | { |
3a0f472d DL |
260 | struct lxc_handler *handler; |
261 | ||
4a2ca8b2 SH |
262 | if (!lxc_caps_check()) { |
263 | ERROR("Not running with sufficient privilege"); | |
264 | return NULL; | |
265 | } | |
266 | ||
3a0f472d DL |
267 | handler = malloc(sizeof(*handler)); |
268 | if (!handler) | |
269 | return NULL; | |
59eb99ba DL |
270 | |
271 | memset(handler, 0, sizeof(*handler)); | |
272 | ||
fae349da | 273 | handler->conf = conf; |
9123e471 | 274 | handler->lxcpath = lxcpath; |
fae349da | 275 | |
e075f5d9 | 276 | apparmor_handler_init(handler); |
3bdf52d7 DL |
277 | handler->name = strdup(name); |
278 | if (!handler->name) { | |
279 | ERROR("failed to allocate memory"); | |
280 | goto out_free; | |
281 | } | |
282 | ||
ef6e34ee | 283 | if (lxc_cmd_init(name, handler, lxcpath)) |
d2e30e99 DE |
284 | goto out_free_name; |
285 | ||
8f2c3a70 SH |
286 | if (lxc_read_seccomp_config(conf) != 0) { |
287 | ERROR("failed loading seccomp policy"); | |
d2e30e99 | 288 | goto out_close_maincmd_fd; |
8f2c3a70 SH |
289 | } |
290 | ||
051151de | 291 | /* Begin by setting the state to STARTING */ |
25c2aca5 | 292 | if (lxc_set_state(name, handler, STARTING)) { |
59eb99ba | 293 | ERROR("failed to set state '%s'", lxc_state2str(STARTING)); |
051151de | 294 | goto out_close_maincmd_fd; |
0ad19a3f | 295 | } |
296 | ||
f7bee6c6 MW |
297 | /* Start of environment variable setup for hooks */ |
298 | if (setenv("LXC_NAME", name, 1)) { | |
299 | SYSERROR("failed to set environment variable for container name"); | |
300 | } | |
301 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
302 | SYSERROR("failed to set environment variable for config path"); | |
303 | } | |
304 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
305 | SYSERROR("failed to set environment variable for rootfs mount"); | |
306 | } | |
307 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
308 | SYSERROR("failed to set environment variable for rootfs mount"); | |
309 | } | |
310 | if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) { | |
311 | SYSERROR("failed to set environment variable for console path"); | |
312 | } | |
313 | if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) { | |
314 | SYSERROR("failed to set environment variable for console log"); | |
315 | } | |
316 | /* End of environment variable setup for hooks */ | |
317 | ||
283678ed | 318 | if (run_lxc_hooks(name, "pre-start", conf, handler->lxcpath, NULL)) { |
773fb9ca SH |
319 | ERROR("failed to run pre-start hooks for container '%s'.", name); |
320 | goto out_aborting; | |
321 | } | |
26ddeedd | 322 | |
fae349da | 323 | if (lxc_create_tty(name, conf)) { |
36eb9bde | 324 | ERROR("failed to create the ttys"); |
59eb99ba | 325 | goto out_aborting; |
b0a33c1e | 326 | } |
327 | ||
328 | /* the signal fd has to be created before forking otherwise | |
329 | * if the child process exits before we setup the signal fd, | |
330 | * the event will be lost and the command will be stuck */ | |
83ee7875 | 331 | handler->sigfd = setup_signal_fd(&handler->oldmask); |
59eb99ba | 332 | if (handler->sigfd < 0) { |
36eb9bde | 333 | ERROR("failed to set sigchild fd handler"); |
b5159817 DE |
334 | goto out_delete_tty; |
335 | } | |
336 | ||
337 | /* do this after setting up signals since it might unblock SIGWINCH */ | |
338 | if (lxc_console_create(conf)) { | |
339 | ERROR("failed to create console"); | |
340 | goto out_restore_sigmask; | |
b0a33c1e | 341 | } |
342 | ||
c3e13372 | 343 | INFO("'%s' is initialized", name); |
3a0f472d | 344 | return handler; |
59eb99ba | 345 | |
b5159817 DE |
346 | out_restore_sigmask: |
347 | sigprocmask(SIG_SETMASK, &handler->oldmask, NULL); | |
59eb99ba | 348 | out_delete_tty: |
fae349da | 349 | lxc_delete_tty(&conf->tty_info); |
59eb99ba | 350 | out_aborting: |
25c2aca5 | 351 | lxc_set_state(name, handler, ABORTING); |
d2e30e99 DE |
352 | out_close_maincmd_fd: |
353 | close(conf->maincmd_fd); | |
354 | conf->maincmd_fd = -1; | |
3bdf52d7 DL |
355 | out_free_name: |
356 | free(handler->name); | |
357 | handler->name = NULL; | |
3a0f472d DL |
358 | out_free: |
359 | free(handler); | |
c3e13372 | 360 | return NULL; |
59eb99ba DL |
361 | } |
362 | ||
ae5c8b8e | 363 | static void lxc_fini(const char *name, struct lxc_handler *handler) |
59eb99ba DL |
364 | { |
365 | /* The STOPPING state is there for future cleanup code | |
366 | * which can take awhile | |
367 | */ | |
25c2aca5 MN |
368 | lxc_set_state(name, handler, STOPPING); |
369 | lxc_set_state(name, handler, STOPPED); | |
59eb99ba | 370 | |
283678ed | 371 | if (run_lxc_hooks(name, "post-stop", handler->conf, handler->lxcpath, NULL)) |
773fb9ca | 372 | ERROR("failed to run post-stop hooks for container '%s'.", name); |
26ddeedd | 373 | |
83ee7875 | 374 | /* reset mask set by setup_signal_fd */ |
8f64a3f6 MN |
375 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) |
376 | WARN("failed to restore sigprocmask"); | |
377 | ||
b5159817 | 378 | lxc_console_delete(&handler->conf->console); |
b2431939 | 379 | lxc_delete_tty(&handler->conf->tty_info); |
d2e30e99 DE |
380 | close(handler->conf->maincmd_fd); |
381 | handler->conf->maincmd_fd = -1; | |
3bdf52d7 | 382 | free(handler->name); |
ae5c8b8e SH |
383 | if (handler->cgroup) { |
384 | lxc_cgroup_destroy(handler->cgroup); | |
385 | free(handler->cgroup); | |
386 | handler->cgroup = NULL; | |
387 | } | |
b2431939 | 388 | free(handler); |
59eb99ba DL |
389 | } |
390 | ||
1bc5cc8c | 391 | void lxc_abort(const char *name, struct lxc_handler *handler) |
59eb99ba | 392 | { |
73e608b2 SH |
393 | int ret, status; |
394 | ||
25c2aca5 | 395 | lxc_set_state(name, handler, ABORTING); |
7d9fb3e9 DL |
396 | if (handler->pid > 0) |
397 | kill(handler->pid, SIGKILL); | |
73e608b2 | 398 | while ((ret = waitpid(-1, &status, 0)) > 0) ; |
59eb99ba DL |
399 | } |
400 | ||
828695d9 SH |
401 | #include <sys/reboot.h> |
402 | #include <linux/reboot.h> | |
403 | ||
e2fa1520 SH |
404 | /* |
405 | * reboot(LINUX_REBOOT_CMD_CAD_ON) will return -EINVAL | |
406 | * in a child pid namespace if container reboot support exists. | |
407 | * Otherwise, it will either succeed or return -EPERM. | |
408 | */ | |
409 | static int container_reboot_supported(void *arg) | |
828695d9 | 410 | { |
e2fa1520 | 411 | int *cmd = arg; |
828695d9 | 412 | int ret; |
828695d9 | 413 | |
e2fa1520 SH |
414 | ret = reboot(*cmd); |
415 | if (ret == -1 && errno == EINVAL) | |
416 | return 1; | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int must_drop_cap_sys_boot(void) | |
421 | { | |
422 | FILE *f = fopen("/proc/sys/kernel/ctrl-alt-del", "r"); | |
423 | int ret, cmd, v; | |
424 | long stack_size = 4096; | |
7f145a6d | 425 | void *stack = alloca(stack_size); |
e2fa1520 SH |
426 | int status; |
427 | pid_t pid; | |
428 | ||
429 | if (!f) { | |
430 | DEBUG("failed to open /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 431 | return 1; |
e2fa1520 | 432 | } |
828695d9 SH |
433 | |
434 | ret = fscanf(f, "%d", &v); | |
435 | fclose(f); | |
e2fa1520 SH |
436 | if (ret != 1) { |
437 | DEBUG("Failed to read /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 438 | return 1; |
e2fa1520 SH |
439 | } |
440 | cmd = v ? LINUX_REBOOT_CMD_CAD_ON : LINUX_REBOOT_CMD_CAD_OFF; | |
441 | ||
7f145a6d DS |
442 | #ifdef __ia64__ |
443 | pid = __clone2(container_reboot_supported, stack, stack_size, CLONE_NEWPID | SIGCHLD, &cmd); | |
444 | #else | |
445 | stack += stack_size; | |
e2fa1520 | 446 | pid = clone(container_reboot_supported, stack, CLONE_NEWPID | SIGCHLD, &cmd); |
7f145a6d | 447 | #endif |
e2fa1520 SH |
448 | if (pid < 0) { |
449 | SYSERROR("failed to clone\n"); | |
450 | return -1; | |
451 | } | |
452 | if (wait(&status) < 0) { | |
453 | SYSERROR("unexpected wait error: %m\n"); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | if (WEXITSTATUS(status) != 1) | |
828695d9 | 458 | return 1; |
e2fa1520 | 459 | |
828695d9 SH |
460 | return 0; |
461 | } | |
462 | ||
ffe1e01a | 463 | static int do_start(void *data) |
50e98013 | 464 | { |
23c53af9 | 465 | struct lxc_handler *handler = data; |
50e98013 DL |
466 | |
467 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) { | |
468 | SYSERROR("failed to set sigprocmask"); | |
9d7f9e52 | 469 | return -1; |
50e98013 DL |
470 | } |
471 | ||
743ecd2e DL |
472 | /* This prctl must be before the synchro, so if the parent |
473 | * dies before we set the parent death signal, we will detect | |
474 | * its death with the synchro right after, otherwise we have | |
475 | * a window where the parent can exit before we set the pdeath | |
476 | * signal leading to a unsupervized container. | |
477 | */ | |
478 | if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0)) { | |
479 | SYSERROR("failed to set pdeath signal"); | |
480 | return -1; | |
481 | } | |
482 | ||
3c22086f | 483 | lxc_sync_fini_parent(handler); |
50e98013 | 484 | |
2b0e17e4 | 485 | /* don't leak the pinfd to the container */ |
0d03360a SH |
486 | if (handler->pinfd >= 0) |
487 | close(handler->pinfd); | |
2b0e17e4 | 488 | |
3c22086f CLG |
489 | /* Tell the parent task it can begin to configure the |
490 | * container and wait for it to finish | |
491 | */ | |
492 | if (lxc_sync_barrier_parent(handler, LXC_SYNC_CONFIGURE)) | |
9d7f9e52 | 493 | return -1; |
50e98013 | 494 | |
f6d3e3e4 SH |
495 | /* |
496 | * if we are in a new user namespace, become root there to have | |
497 | * privilege over our namespace | |
498 | */ | |
499 | if (!lxc_list_empty(&handler->conf->id_map)) { | |
500 | NOTICE("switching to gid/uid 0 in new user namespace"); | |
501 | if (setgid(0)) { | |
502 | SYSERROR("setgid"); | |
503 | goto out_warn_father; | |
504 | } | |
505 | if (setuid(0)) { | |
506 | SYSERROR("setuid"); | |
507 | goto out_warn_father; | |
508 | } | |
509 | } | |
510 | ||
495d2046 | 511 | #if HAVE_SYS_CAPABILITY_H |
69182a31 | 512 | if (handler->conf->need_utmp_watch) { |
828695d9 SH |
513 | if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) { |
514 | SYSERROR("failed to remove CAP_SYS_BOOT capability"); | |
c4ea60df | 515 | goto out_warn_father; |
828695d9 | 516 | } |
e2fa1520 | 517 | DEBUG("Dropped cap_sys_boot\n"); |
e2fa1520 | 518 | } |
495d2046 | 519 | #endif |
e2fa1520 SH |
520 | |
521 | /* Setup the container, ip, names, utsname, ... */ | |
283678ed | 522 | if (lxc_setup(handler->name, handler->conf, handler->lxcpath)) { |
e2fa1520 SH |
523 | ERROR("failed to setup the container"); |
524 | goto out_warn_father; | |
525 | } | |
50e98013 | 526 | |
544a48a0 SH |
527 | /* ask father to setup cgroups and wait for him to finish */ |
528 | if (lxc_sync_barrier_parent(handler, LXC_SYNC_CGROUP)) | |
529 | return -1; | |
530 | ||
e075f5d9 SH |
531 | if (apparmor_load(handler) < 0) |
532 | goto out_warn_father; | |
533 | ||
8f2c3a70 SH |
534 | if (lxc_seccomp_load(handler->conf) != 0) |
535 | goto out_warn_father; | |
536 | ||
283678ed | 537 | if (run_lxc_hooks(handler->name, "start", handler->conf, handler->lxcpath, NULL)) { |
773fb9ca SH |
538 | ERROR("failed to run start hooks for container '%s'.", handler->name); |
539 | goto out_warn_father; | |
540 | } | |
fc25b815 | 541 | |
f7bee6c6 MW |
542 | /* The clearenv() and putenv() calls have been moved here |
543 | * to allow us to use enviroment variables passed to the various | |
544 | * hooks, such as the start hook above. Not all of the | |
545 | * variables like CONFIG_PATH or ROOTFS are valid in this | |
546 | * context but others are. */ | |
547 | if (clearenv()) { | |
548 | SYSERROR("failed to clear environment"); | |
549 | /* don't error out though */ | |
550 | } | |
551 | ||
552 | if (putenv("container=lxc")) { | |
553 | SYSERROR("failed to set environment variable"); | |
c4ea60df | 554 | goto out_warn_father; |
f7bee6c6 MW |
555 | } |
556 | ||
773fb9ca | 557 | close(handler->sigfd); |
26ddeedd | 558 | |
e6126dbe MN |
559 | /* after this call, we are in error because this |
560 | * ops should not return as it execs */ | |
c4ea60df | 561 | handler->ops->start(handler, handler->data); |
50e98013 DL |
562 | |
563 | out_warn_father: | |
544a48a0 SH |
564 | /* we want the parent to know something went wrong, so any |
565 | * value other than what it expects is ok. */ | |
3c22086f | 566 | lxc_sync_wake_parent(handler, LXC_SYNC_POST_CONFIGURE); |
50e98013 DL |
567 | return -1; |
568 | } | |
569 | ||
7b35f3d6 SH |
570 | int save_phys_nics(struct lxc_conf *conf) |
571 | { | |
572 | struct lxc_list *iterator; | |
573 | ||
574 | lxc_list_for_each(iterator, &conf->network) { | |
575 | struct lxc_netdev *netdev = iterator->elem; | |
576 | ||
577 | if (netdev->type != LXC_NET_PHYS) | |
578 | continue; | |
579 | conf->saved_nics = realloc(conf->saved_nics, | |
580 | (conf->num_savednics+1)*sizeof(struct saved_nic)); | |
581 | if (!conf->saved_nics) { | |
582 | SYSERROR("failed to allocate memory"); | |
583 | return -1; | |
584 | } | |
585 | conf->saved_nics[conf->num_savednics].ifindex = netdev->ifindex; | |
586 | conf->saved_nics[conf->num_savednics].orig_name = strdup(netdev->link); | |
587 | if (!conf->saved_nics[conf->num_savednics].orig_name) { | |
588 | SYSERROR("failed to allocate memory"); | |
589 | return -1; | |
590 | } | |
591 | INFO("stored saved_nic #%d idx %d name %s\n", conf->num_savednics, | |
592 | conf->saved_nics[conf->num_savednics].ifindex, | |
593 | conf->saved_nics[conf->num_savednics].orig_name); | |
594 | conf->num_savednics++; | |
595 | } | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
283678ed | 600 | extern bool is_in_subcgroup(int pid, const char *subsystem, const char *cgpath); |
23c53af9 | 601 | int lxc_spawn(struct lxc_handler *handler) |
59eb99ba | 602 | { |
99a6af52 | 603 | int failed_before_rename = 0; |
ffe1e01a | 604 | const char *name = handler->name; |
50e98013 | 605 | |
3c22086f | 606 | if (lxc_sync_init(handler)) |
9d7f9e52 | 607 | return -1; |
0ad19a3f | 608 | |
d5088cf2 | 609 | handler->clone_flags = CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS; |
f6d3e3e4 SH |
610 | if (!lxc_list_empty(&handler->conf->id_map)) { |
611 | INFO("Cloning a new user namespace"); | |
612 | handler->clone_flags |= CLONE_NEWUSER; | |
613 | } | |
fae349da | 614 | if (!lxc_list_empty(&handler->conf->network)) { |
82d5ae15 | 615 | |
d5088cf2 | 616 | handler->clone_flags |= CLONE_NEWNET; |
0ad19a3f | 617 | |
19a26f82 MK |
618 | /* Find gateway addresses from the link device, which is |
619 | * no longer accessible inside the container. Do this | |
620 | * before creating network interfaces, since goto | |
621 | * out_delete_net does not work before lxc_clone. */ | |
622 | if (lxc_find_gateway_addresses(handler)) { | |
623 | ERROR("failed to find gateway addresses"); | |
624 | lxc_sync_fini(handler); | |
625 | return -1; | |
626 | } | |
627 | ||
82d5ae15 DL |
628 | /* that should be done before the clone because we will |
629 | * fill the netdev index and use them in the child | |
630 | */ | |
e3b4c4c4 | 631 | if (lxc_create_network(handler)) { |
82d5ae15 | 632 | ERROR("failed to create the network"); |
3c22086f | 633 | lxc_sync_fini(handler); |
32e1c760 | 634 | return -1; |
82d5ae15 DL |
635 | } |
636 | } | |
637 | ||
7b35f3d6 SH |
638 | if (save_phys_nics(handler->conf)) { |
639 | ERROR("failed to save physical nic info"); | |
640 | goto out_abort; | |
641 | } | |
642 | ||
0c547523 SH |
643 | /* |
644 | * if the rootfs is not a blockdev, prevent the container from | |
645 | * marking it readonly. | |
646 | */ | |
647 | ||
2b0e17e4 SH |
648 | handler->pinfd = pin_rootfs(handler->conf->rootfs.path); |
649 | if (handler->pinfd == -1) { | |
0c547523 | 650 | ERROR("failed to pin the container's rootfs"); |
d71d919e | 651 | goto out_delete_net; |
0c547523 SH |
652 | } |
653 | ||
0ad19a3f | 654 | /* Create a process in a new set of namespaces */ |
d5088cf2 | 655 | handler->pid = lxc_clone(do_start, handler, handler->clone_flags); |
59eb99ba | 656 | if (handler->pid < 0) { |
36eb9bde | 657 | SYSERROR("failed to fork into a new namespace"); |
7fef7a06 | 658 | goto out_delete_net; |
0ad19a3f | 659 | } |
660 | ||
3c22086f CLG |
661 | lxc_sync_fini_child(handler); |
662 | ||
663 | if (lxc_sync_wait_child(handler, LXC_SYNC_CONFIGURE)) | |
99a6af52 | 664 | failed_before_rename = 1; |
0ad19a3f | 665 | |
ae5c8b8e SH |
666 | /* TODO - pass lxc.cgroup.dir (or user's pam cgroup) in for first argument */ |
667 | if ((handler->cgroup = lxc_cgroup_path_create(NULL, name)) == NULL) | |
668 | goto out_delete_net; | |
e51d4895 | 669 | |
6031a6e5 DE |
670 | if (setup_cgroup(handler->cgroup, &handler->conf->cgroup)) { |
671 | ERROR("failed to setup the cgroups for '%s'", name); | |
672 | goto out_delete_net; | |
673 | } | |
674 | ||
ae5c8b8e | 675 | if (lxc_cgroup_enter(handler->cgroup, handler->pid) < 0) |
7fef7a06 | 676 | goto out_delete_net; |
218d4250 | 677 | |
99a6af52 MN |
678 | if (failed_before_rename) |
679 | goto out_delete_net; | |
680 | ||
0ad19a3f | 681 | /* Create the network configuration */ |
d5088cf2 | 682 | if (handler->clone_flags & CLONE_NEWNET) { |
fae349da | 683 | if (lxc_assign_network(&handler->conf->network, handler->pid)) { |
82d5ae15 | 684 | ERROR("failed to create the configured network"); |
7fef7a06 | 685 | goto out_delete_net; |
82d5ae15 | 686 | } |
0ad19a3f | 687 | } |
688 | ||
f6d3e3e4 SH |
689 | /* map the container uids - the container became an invalid |
690 | * userid the moment it was cloned with CLONE_NEWUSER - this | |
691 | * call doesn't change anything immediately, but allows the | |
692 | * container to setuid(0) (0 being mapped to something else on | |
693 | * the host) later to become a valid uid again */ | |
694 | if (lxc_map_ids(&handler->conf->id_map, handler->pid)) { | |
695 | ERROR("failed to set up id mapping"); | |
696 | goto out_delete_net; | |
697 | } | |
698 | ||
544a48a0 SH |
699 | /* Tell the child to continue its initialization. we'll get |
700 | * LXC_SYNC_CGROUP when it is ready for us to setup cgroups | |
3c22086f CLG |
701 | */ |
702 | if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CONFIGURE)) | |
544a48a0 SH |
703 | goto out_delete_net; |
704 | ||
6031a6e5 | 705 | if (setup_cgroup_devices(handler->cgroup, &handler->conf->cgroup)) { |
283678ed SH |
706 | /* an unfortunate special case: startup hooks may have already |
707 | * setup the cgroup. If a setting fails, and this is the devices | |
708 | * subsystem, *and* we are already in a subset of the cgroup, | |
709 | * then ignore the failure */ | |
710 | if (!is_in_subcgroup(handler->pid, "devices", handler->cgroup)) { | |
711 | ERROR("failed to setup the devices cgroup for '%s'", name); | |
712 | goto out_delete_net; | |
713 | } | |
544a48a0 SH |
714 | } |
715 | ||
544a48a0 SH |
716 | /* Tell the child to complete its initialization and wait for |
717 | * it to exec or return an error. (the child will never | |
718 | * return LXC_SYNC_POST_CGROUP+1. It will either close the | |
719 | * sync pipe, causing lxc_sync_barrier_child to return | |
720 | * success, or return a different value, causing us to error | |
721 | * out). | |
722 | */ | |
723 | if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CGROUP)) | |
3c22086f | 724 | return -1; |
0ad19a3f | 725 | |
cc28d0b0 SH |
726 | if (detect_shared_rootfs()) |
727 | umount2(handler->conf->rootfs.mount, MNT_DETACH); | |
728 | ||
f6d3e3e4 SH |
729 | /* If child is in a fresh user namespace, chown his ptys for |
730 | * it */ | |
731 | if (uid_shift_ttys(handler->pid, handler->conf)) | |
732 | DEBUG("Failed to chown ptys.\n"); | |
733 | ||
23c53af9 | 734 | if (handler->ops->post_start(handler, handler->data)) |
e6126dbe MN |
735 | goto out_abort; |
736 | ||
25c2aca5 | 737 | if (lxc_set_state(name, handler, RUNNING)) { |
59eb99ba DL |
738 | ERROR("failed to set state to %s", |
739 | lxc_state2str(RUNNING)); | |
740 | goto out_abort; | |
3f21c114 | 741 | } |
22ebac19 | 742 | |
3c22086f | 743 | lxc_sync_fini(handler); |
0c547523 | 744 | |
2b0e17e4 SH |
745 | if (handler->pinfd >= 0) |
746 | close(handler->pinfd); | |
0c547523 | 747 | |
e6126dbe | 748 | return 0; |
1ac470c0 | 749 | |
7fef7a06 | 750 | out_delete_net: |
d5088cf2 | 751 | if (handler->clone_flags & CLONE_NEWNET) |
74a2b586 | 752 | lxc_delete_network(handler); |
59eb99ba DL |
753 | out_abort: |
754 | lxc_abort(name, handler); | |
3c22086f | 755 | lxc_sync_fini(handler); |
b79fcd86 | 756 | return -1; |
59eb99ba | 757 | } |
0ad19a3f | 758 | |
ee70bf78 | 759 | int __lxc_start(const char *name, struct lxc_conf *conf, |
13f5be62 | 760 | struct lxc_operations* ops, void *data, const char *lxcpath) |
59eb99ba | 761 | { |
3a0f472d | 762 | struct lxc_handler *handler; |
e043236e | 763 | int err = -1; |
59eb99ba | 764 | int status; |
80090207 | 765 | |
13f5be62 | 766 | handler = lxc_init(name, conf, lxcpath); |
3a0f472d | 767 | if (!handler) { |
59eb99ba | 768 | ERROR("failed to initialize the container"); |
66aeffc7 | 769 | return -1; |
0ad19a3f | 770 | } |
ee70bf78 CLG |
771 | handler->ops = ops; |
772 | handler->data = data; | |
e6126dbe | 773 | |
69182a31 | 774 | if (must_drop_cap_sys_boot()) { |
495d2046 | 775 | #if HAVE_SYS_CAPABILITY_H |
f51db2b3 | 776 | DEBUG("Dropping cap_sys_boot\n"); |
495d2046 SG |
777 | #else |
778 | DEBUG("Can't drop cap_sys_boot as capabilities aren't supported\n"); | |
779 | #endif | |
69182a31 SH |
780 | } else { |
781 | DEBUG("Not dropping cap_sys_boot or watching utmp\n"); | |
782 | handler->conf->need_utmp_watch = 0; | |
783 | } | |
784 | ||
23c53af9 | 785 | err = lxc_spawn(handler); |
59eb99ba | 786 | if (err) { |
ee70bf78 | 787 | ERROR("failed to spawn '%s'", name); |
74a2b586 | 788 | goto out_fini_nonet; |
0ad19a3f | 789 | } |
790 | ||
3a0f472d | 791 | err = lxc_poll(name, handler); |
e043236e | 792 | if (err) { |
59eb99ba DL |
793 | ERROR("mainloop exited with an error"); |
794 | goto out_abort; | |
795 | } | |
0ad19a3f | 796 | |
3a0f472d | 797 | while (waitpid(handler->pid, &status, 0) < 0 && errno == EINTR) |
1bc5cc8c | 798 | continue; |
e043236e | 799 | |
8b004f07 SH |
800 | /* |
801 | * If the child process exited but was not signaled, | |
802 | * it didn't call reboot. This should mean it was an | |
803 | * lxc-execute which simply exited. In any case, treat | |
804 | * it as a 'halt' | |
805 | */ | |
806 | if (WIFSIGNALED(status)) { | |
807 | switch(WTERMSIG(status)) { | |
808 | case SIGINT: /* halt */ | |
809 | DEBUG("Container halting"); | |
810 | break; | |
811 | case SIGHUP: /* reboot */ | |
812 | DEBUG("Container rebooting"); | |
813 | handler->conf->reboot = 1; | |
814 | break; | |
815 | default: | |
816 | DEBUG("unknown exit status for init: %d\n", WTERMSIG(status)); | |
817 | break; | |
818 | } | |
828695d9 SH |
819 | } |
820 | ||
7b35f3d6 SH |
821 | lxc_rename_phys_nics_on_shutdown(handler->conf); |
822 | ||
3a0f472d | 823 | err = lxc_error_set_and_log(handler->pid, status); |
9d7f9e52 | 824 | out_fini: |
74a2b586 JK |
825 | lxc_delete_network(handler); |
826 | ||
827 | out_fini_nonet: | |
3a0f472d | 828 | lxc_fini(name, handler); |
0ad19a3f | 829 | return err; |
830 | ||
59eb99ba | 831 | out_abort: |
3a0f472d | 832 | lxc_abort(name, handler); |
9d7f9e52 | 833 | goto out_fini; |
0ad19a3f | 834 | } |
ee70bf78 CLG |
835 | |
836 | struct start_args { | |
837 | char *const *argv; | |
838 | }; | |
839 | ||
840 | static int start(struct lxc_handler *handler, void* data) | |
841 | { | |
842 | struct start_args *arg = data; | |
843 | ||
844 | NOTICE("exec'ing '%s'", arg->argv[0]); | |
845 | ||
846 | execvp(arg->argv[0], arg->argv); | |
847 | SYSERROR("failed to exec %s", arg->argv[0]); | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static int post_start(struct lxc_handler *handler, void* data) | |
852 | { | |
853 | struct start_args *arg = data; | |
854 | ||
855 | NOTICE("'%s' started with pid '%d'", arg->argv[0], handler->pid); | |
856 | return 0; | |
857 | } | |
858 | ||
859 | static struct lxc_operations start_ops = { | |
860 | .start = start, | |
861 | .post_start = post_start | |
862 | }; | |
863 | ||
13f5be62 SH |
864 | int lxc_start(const char *name, char *const argv[], struct lxc_conf *conf, |
865 | const char *lxcpath) | |
ee70bf78 CLG |
866 | { |
867 | struct start_args start_arg = { | |
868 | .argv = argv, | |
869 | }; | |
870 | ||
b119f362 | 871 | if (lxc_check_inherited(conf, -1)) |
ee70bf78 CLG |
872 | return -1; |
873 | ||
828695d9 | 874 | conf->need_utmp_watch = 1; |
13f5be62 | 875 | return __lxc_start(name, conf, &start_ops, &start_arg, lxcpath); |
ee70bf78 | 876 | } |