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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: | |
7 | * Daniel Lezcano <dlezcano at fr.ibm.com> | |
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> |
0ad19a3f | 41 | #include <sys/prctl.h> |
ddceb1f9 | 42 | #include <sys/types.h> |
42ff343d | 43 | #include <sys/capability.h> |
0ad19a3f | 44 | #include <sys/wait.h> |
b0a33c1e | 45 | #include <sys/un.h> |
46 | #include <sys/poll.h> | |
ff218c25 | 47 | |
15cd25fd | 48 | #ifdef HAVE_SYS_SIGNALFD_H |
8ca61733 | 49 | # include <sys/signalfd.h> |
ff218c25 | 50 | #else |
15cd25fd | 51 | /* assume kernel headers are too old */ |
09d1bd23 | 52 | #include <stdint.h> |
15cd25fd DL |
53 | struct signalfd_siginfo |
54 | { | |
da2aef7f DL |
55 | uint32_t ssi_signo; |
56 | int32_t ssi_errno; | |
57 | int32_t ssi_code; | |
58 | uint32_t ssi_pid; | |
59 | uint32_t ssi_uid; | |
60 | int32_t ssi_fd; | |
61 | uint32_t ssi_tid; | |
62 | uint32_t ssi_band; | |
63 | uint32_t ssi_overrun; | |
64 | uint32_t ssi_trapno; | |
65 | int32_t ssi_status; | |
66 | int32_t ssi_int; | |
67 | uint64_t ssi_ptr; | |
68 | uint64_t ssi_utime; | |
69 | uint64_t ssi_stime; | |
70 | uint64_t ssi_addr; | |
71 | uint8_t __pad[48]; | |
15cd25fd DL |
72 | }; |
73 | ||
8ca61733 MJ |
74 | # ifndef __NR_signalfd4 |
75 | /* assume kernel headers are too old */ | |
76 | # if __i386__ | |
77 | # define __NR_signalfd4 327 | |
78 | # elif __x86_64__ | |
79 | # define __NR_signalfd4 289 | |
bfa38025 MH |
80 | # elif __powerpc__ |
81 | # define __NR_signalfd4 313 | |
47f38330 SH |
82 | # elif __s390x__ |
83 | # define __NR_signalfd4 322 | |
8ca61733 MJ |
84 | # endif |
85 | #endif | |
86 | ||
87 | # ifndef __NR_signalfd | |
88 | /* assume kernel headers are too old */ | |
89 | # if __i386__ | |
90 | # define __NR_signalfd 321 | |
91 | # elif __x86_64__ | |
92 | # define __NR_signalfd 282 | |
bfa38025 MH |
93 | # elif __powerpc__ |
94 | # define __NR_signalfd 305 | |
47f38330 SH |
95 | # elif __s390x__ |
96 | # define __NR_signalfd 316 | |
8ca61733 MJ |
97 | # endif |
98 | #endif | |
99 | ||
100 | int signalfd(int fd, const sigset_t *mask, int flags) | |
101 | { | |
102 | int retval; | |
103 | ||
104 | retval = syscall (__NR_signalfd4, fd, mask, _NSIG / 8, flags); | |
105 | if (errno == ENOSYS && flags == 0) | |
106 | retval = syscall (__NR_signalfd, fd, mask, _NSIG / 8); | |
107 | return retval; | |
108 | } | |
ff218c25 | 109 | #endif |
0ad19a3f | 110 | |
656994bb MH |
111 | #if !HAVE_DECL_PR_CAPBSET_DROP |
112 | #define PR_CAPBSET_DROP 24 | |
113 | #endif | |
114 | ||
63376d7d DL |
115 | #include "start.h" |
116 | #include "conf.h" | |
117 | #include "log.h" | |
563f2f2c | 118 | #include "cgroup.h" |
e2bcd7db | 119 | #include "error.h" |
b0a33c1e | 120 | #include "af_unix.h" |
121 | #include "mainloop.h" | |
63376d7d | 122 | #include "utils.h" |
563f2f2c | 123 | #include "utmp.h" |
63376d7d | 124 | #include "monitor.h" |
96fa1ff0 | 125 | #include "commands.h" |
63376d7d | 126 | #include "console.h" |
3c22086f | 127 | #include "sync.h" |
f549edcc | 128 | #include "namespace.h" |
e075f5d9 | 129 | #include "apparmor.h" |
0d0527a9 | 130 | #include "lxcseccomp.h" |
36eb9bde CLG |
131 | |
132 | lxc_log_define(lxc_start, lxc); | |
133 | ||
80090207 CLG |
134 | static int match_fd(int fd) |
135 | { | |
136 | return (fd == 0 || fd == 1 || fd == 2); | |
137 | } | |
138 | ||
b119f362 | 139 | int lxc_check_inherited(struct lxc_conf *conf, int fd_to_ignore) |
80090207 CLG |
140 | { |
141 | struct dirent dirent, *direntp; | |
142 | int fd, fddir; | |
143 | DIR *dir; | |
80090207 | 144 | |
b119f362 | 145 | restart: |
80090207 CLG |
146 | dir = opendir("/proc/self/fd"); |
147 | if (!dir) { | |
148 | WARN("failed to open directory: %m"); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | fddir = dirfd(dir); | |
153 | ||
154 | while (!readdir_r(dir, &dirent, &direntp)) { | |
80090207 CLG |
155 | if (!direntp) |
156 | break; | |
157 | ||
158 | if (!strcmp(direntp->d_name, ".")) | |
159 | continue; | |
160 | ||
161 | if (!strcmp(direntp->d_name, "..")) | |
162 | continue; | |
163 | ||
164 | fd = atoi(direntp->d_name); | |
165 | ||
f2faa8fa | 166 | if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore) |
80090207 CLG |
167 | continue; |
168 | ||
169 | if (match_fd(fd)) | |
170 | continue; | |
80090207 | 171 | |
b119f362 SH |
172 | if (conf->close_all_fds) { |
173 | close(fd); | |
174 | closedir(dir); | |
175 | INFO("closed inherited fd %d", fd); | |
176 | goto restart; | |
177 | } | |
92c7f629 | 178 | WARN("inherited fd %d", fd); |
80090207 CLG |
179 | } |
180 | ||
92c7f629 GK |
181 | closedir(dir); /* cannot fail */ |
182 | return 0; | |
80090207 CLG |
183 | } |
184 | ||
83ee7875 | 185 | static int setup_signal_fd(sigset_t *oldmask) |
b0a33c1e | 186 | { |
187 | sigset_t mask; | |
188 | int fd; | |
189 | ||
f3304a29 FW |
190 | /* Block everything except serious error signals */ |
191 | if (sigfillset(&mask) || | |
192 | sigdelset(&mask, SIGILL) || | |
193 | sigdelset(&mask, SIGSEGV) || | |
194 | sigdelset(&mask, SIGBUS) || | |
195 | sigprocmask(SIG_BLOCK, &mask, oldmask)) { | |
196 | SYSERROR("failed to set signal mask"); | |
b0a33c1e | 197 | return -1; |
198 | } | |
199 | ||
200 | fd = signalfd(-1, &mask, 0); | |
201 | if (fd < 0) { | |
36eb9bde | 202 | SYSERROR("failed to create the signal fd"); |
b0a33c1e | 203 | return -1; |
204 | } | |
205 | ||
206 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { | |
36eb9bde | 207 | SYSERROR("failed to set sigfd to close-on-exec"); |
b0a33c1e | 208 | close(fd); |
209 | return -1; | |
210 | } | |
211 | ||
1ac470c0 DL |
212 | DEBUG("sigchild handler set"); |
213 | ||
b0a33c1e | 214 | return fd; |
215 | } | |
216 | ||
83ee7875 | 217 | static int signal_handler(int fd, void *data, |
b0a33c1e | 218 | struct lxc_epoll_descr *descr) |
219 | { | |
15cd25fd DL |
220 | struct signalfd_siginfo siginfo; |
221 | int ret; | |
82d89dce | 222 | pid_t *pid = data; |
15cd25fd DL |
223 | |
224 | ret = read(fd, &siginfo, sizeof(siginfo)); | |
225 | if (ret < 0) { | |
f3304a29 | 226 | ERROR("failed to read signal info"); |
15cd25fd DL |
227 | return -1; |
228 | } | |
229 | ||
230 | if (ret != sizeof(siginfo)) { | |
231 | ERROR("unexpected siginfo size"); | |
232 | return -1; | |
233 | } | |
234 | ||
f3304a29 FW |
235 | if (siginfo.ssi_signo != SIGCHLD) { |
236 | kill(*pid, siginfo.ssi_signo); | |
237 | INFO("forwarded signal %d to pid %d", siginfo.ssi_signo, *pid); | |
238 | return 0; | |
239 | } | |
240 | ||
15cd25fd DL |
241 | if (siginfo.ssi_code == CLD_STOPPED || |
242 | siginfo.ssi_code == CLD_CONTINUED) { | |
243 | INFO("container init process was stopped/continued"); | |
244 | return 0; | |
245 | } | |
1ac470c0 | 246 | |
82d89dce DL |
247 | /* more robustness, protect ourself from a SIGCHLD sent |
248 | * by a process different from the container init | |
249 | */ | |
250 | if (siginfo.ssi_pid != *pid) { | |
251 | WARN("invalid pid for SIGCHLD"); | |
252 | return 0; | |
253 | } | |
254 | ||
15cd25fd | 255 | DEBUG("container init process exited"); |
b0a33c1e | 256 | return 1; |
257 | } | |
258 | ||
0a3ec350 DL |
259 | int lxc_pid_callback(int fd, struct lxc_request *request, |
260 | struct lxc_handler *handler) | |
81c75799 DL |
261 | { |
262 | struct lxc_answer answer; | |
263 | int ret; | |
264 | ||
265 | answer.pid = handler->pid; | |
266 | answer.ret = 0; | |
267 | ||
268 | ret = send(fd, &answer, sizeof(answer), 0); | |
269 | if (ret < 0) { | |
270 | WARN("failed to send answer to the peer"); | |
271 | return -1; | |
272 | } | |
273 | ||
274 | if (ret != sizeof(answer)) { | |
275 | ERROR("partial answer sent"); | |
276 | return -1; | |
277 | } | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
d5088cf2 CS |
282 | int lxc_clone_flags_callback(int fd, struct lxc_request *request, |
283 | struct lxc_handler *handler) | |
284 | { | |
285 | struct lxc_answer answer; | |
286 | int ret; | |
287 | ||
288 | answer.pid = 0; | |
289 | answer.ret = handler->clone_flags; | |
290 | ||
291 | ret = send(fd, &answer, sizeof(answer), 0); | |
292 | if (ret < 0) { | |
293 | WARN("failed to send answer to the peer"); | |
294 | return -1; | |
295 | } | |
296 | ||
297 | if (ret != sizeof(answer)) { | |
298 | ERROR("partial answer sent"); | |
299 | return -1; | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
25c2aca5 | 305 | int lxc_set_state(const char *name, struct lxc_handler *handler, lxc_state_t state) |
66aeffc7 DL |
306 | { |
307 | handler->state = state; | |
308 | lxc_monitor_send_state(name, state); | |
309 | return 0; | |
310 | } | |
311 | ||
1bc5cc8c | 312 | int lxc_poll(const char *name, struct lxc_handler *handler) |
b0a33c1e | 313 | { |
ca5f7926 DL |
314 | int sigfd = handler->sigfd; |
315 | int pid = handler->pid; | |
b0a33c1e | 316 | struct lxc_epoll_descr descr; |
317 | ||
a9e61274 | 318 | if (lxc_mainloop_open(&descr)) { |
36eb9bde | 319 | ERROR("failed to create mainloop"); |
50c8bf05 | 320 | goto out_sigfd; |
b0a33c1e | 321 | } |
322 | ||
83ee7875 | 323 | if (lxc_mainloop_add_handler(&descr, sigfd, signal_handler, &pid)) { |
36eb9bde | 324 | ERROR("failed to add handler for the signal"); |
b0a33c1e | 325 | goto out_mainloop_open; |
326 | } | |
327 | ||
63376d7d DL |
328 | if (lxc_console_mainloop_add(&descr, handler)) { |
329 | ERROR("failed to add console handler to mainloop"); | |
330 | goto out_mainloop_open; | |
331 | } | |
332 | ||
563f2f2c DL |
333 | if (lxc_command_mainloop_add(name, &descr, handler)) { |
334 | ERROR("failed to add command handler to mainloop"); | |
96fa1ff0 | 335 | goto out_mainloop_open; |
563f2f2c DL |
336 | } |
337 | ||
828695d9 SH |
338 | if (handler->conf->need_utmp_watch) { |
339 | if (lxc_utmp_mainloop_add(&descr, handler)) { | |
340 | ERROR("failed to add utmp handler to mainloop"); | |
341 | goto out_mainloop_open; | |
342 | } | |
563f2f2c | 343 | } |
b0a33c1e | 344 | |
c3e13372 | 345 | return lxc_mainloop(&descr); |
b0a33c1e | 346 | |
347 | out_mainloop_open: | |
348 | lxc_mainloop_close(&descr); | |
b0a33c1e | 349 | out_sigfd: |
350 | close(sigfd); | |
c3e13372 | 351 | return -1; |
b0a33c1e | 352 | } |
353 | ||
4a2ca8b2 SH |
354 | extern int lxc_caps_check(void); |
355 | ||
fae349da | 356 | struct lxc_handler *lxc_init(const char *name, struct lxc_conf *conf) |
59eb99ba | 357 | { |
3a0f472d DL |
358 | struct lxc_handler *handler; |
359 | ||
4a2ca8b2 SH |
360 | if (!lxc_caps_check()) { |
361 | ERROR("Not running with sufficient privilege"); | |
362 | return NULL; | |
363 | } | |
364 | ||
3a0f472d DL |
365 | handler = malloc(sizeof(*handler)); |
366 | if (!handler) | |
367 | return NULL; | |
59eb99ba DL |
368 | |
369 | memset(handler, 0, sizeof(*handler)); | |
370 | ||
fae349da DL |
371 | handler->conf = conf; |
372 | ||
e075f5d9 | 373 | apparmor_handler_init(handler); |
3bdf52d7 DL |
374 | handler->name = strdup(name); |
375 | if (!handler->name) { | |
376 | ERROR("failed to allocate memory"); | |
377 | goto out_free; | |
378 | } | |
379 | ||
d2e30e99 DE |
380 | if (lxc_command_init(name, handler)) |
381 | goto out_free_name; | |
382 | ||
8f2c3a70 SH |
383 | if (lxc_read_seccomp_config(conf) != 0) { |
384 | ERROR("failed loading seccomp policy"); | |
d2e30e99 | 385 | goto out_close_maincmd_fd; |
8f2c3a70 SH |
386 | } |
387 | ||
0ad19a3f | 388 | /* Begin the set the state to STARTING*/ |
25c2aca5 | 389 | if (lxc_set_state(name, handler, STARTING)) { |
59eb99ba | 390 | ERROR("failed to set state '%s'", lxc_state2str(STARTING)); |
3bdf52d7 | 391 | goto out_free_name; |
0ad19a3f | 392 | } |
393 | ||
773fb9ca SH |
394 | if (run_lxc_hooks(name, "pre-start", conf)) { |
395 | ERROR("failed to run pre-start hooks for container '%s'.", name); | |
396 | goto out_aborting; | |
397 | } | |
26ddeedd | 398 | |
fae349da | 399 | if (lxc_create_tty(name, conf)) { |
36eb9bde | 400 | ERROR("failed to create the ttys"); |
59eb99ba | 401 | goto out_aborting; |
b0a33c1e | 402 | } |
403 | ||
1560f6c9 | 404 | if (lxc_create_console(conf)) { |
63376d7d DL |
405 | ERROR("failed to create console"); |
406 | goto out_delete_tty; | |
407 | } | |
408 | ||
b0a33c1e | 409 | /* the signal fd has to be created before forking otherwise |
410 | * if the child process exits before we setup the signal fd, | |
411 | * the event will be lost and the command will be stuck */ | |
83ee7875 | 412 | handler->sigfd = setup_signal_fd(&handler->oldmask); |
59eb99ba | 413 | if (handler->sigfd < 0) { |
36eb9bde | 414 | ERROR("failed to set sigchild fd handler"); |
63376d7d | 415 | goto out_delete_console; |
b0a33c1e | 416 | } |
417 | ||
c3e13372 | 418 | INFO("'%s' is initialized", name); |
3a0f472d | 419 | return handler; |
59eb99ba | 420 | |
63376d7d DL |
421 | out_delete_console: |
422 | lxc_delete_console(&conf->console); | |
59eb99ba | 423 | out_delete_tty: |
fae349da | 424 | lxc_delete_tty(&conf->tty_info); |
59eb99ba | 425 | out_aborting: |
25c2aca5 | 426 | lxc_set_state(name, handler, ABORTING); |
d2e30e99 DE |
427 | out_close_maincmd_fd: |
428 | close(conf->maincmd_fd); | |
429 | conf->maincmd_fd = -1; | |
3bdf52d7 DL |
430 | out_free_name: |
431 | free(handler->name); | |
432 | handler->name = NULL; | |
3a0f472d DL |
433 | out_free: |
434 | free(handler); | |
c3e13372 | 435 | return NULL; |
59eb99ba DL |
436 | } |
437 | ||
1bc5cc8c | 438 | void lxc_fini(const char *name, struct lxc_handler *handler) |
59eb99ba DL |
439 | { |
440 | /* The STOPPING state is there for future cleanup code | |
441 | * which can take awhile | |
442 | */ | |
25c2aca5 MN |
443 | lxc_set_state(name, handler, STOPPING); |
444 | lxc_set_state(name, handler, STOPPED); | |
59eb99ba | 445 | |
773fb9ca SH |
446 | if (run_lxc_hooks(name, "post-stop", handler->conf)) |
447 | ERROR("failed to run post-stop hooks for container '%s'.", name); | |
26ddeedd | 448 | |
83ee7875 | 449 | /* reset mask set by setup_signal_fd */ |
8f64a3f6 MN |
450 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) |
451 | WARN("failed to restore sigprocmask"); | |
452 | ||
63376d7d | 453 | lxc_delete_console(&handler->conf->console); |
b2431939 | 454 | lxc_delete_tty(&handler->conf->tty_info); |
d2e30e99 DE |
455 | close(handler->conf->maincmd_fd); |
456 | handler->conf->maincmd_fd = -1; | |
3bdf52d7 | 457 | free(handler->name); |
b2431939 | 458 | free(handler); |
59eb99ba DL |
459 | } |
460 | ||
1bc5cc8c | 461 | void lxc_abort(const char *name, struct lxc_handler *handler) |
59eb99ba | 462 | { |
25c2aca5 | 463 | lxc_set_state(name, handler, ABORTING); |
7d9fb3e9 DL |
464 | if (handler->pid > 0) |
465 | kill(handler->pid, SIGKILL); | |
59eb99ba DL |
466 | } |
467 | ||
828695d9 SH |
468 | #include <sys/reboot.h> |
469 | #include <linux/reboot.h> | |
470 | ||
e2fa1520 SH |
471 | /* |
472 | * reboot(LINUX_REBOOT_CMD_CAD_ON) will return -EINVAL | |
473 | * in a child pid namespace if container reboot support exists. | |
474 | * Otherwise, it will either succeed or return -EPERM. | |
475 | */ | |
476 | static int container_reboot_supported(void *arg) | |
828695d9 | 477 | { |
e2fa1520 | 478 | int *cmd = arg; |
828695d9 | 479 | int ret; |
828695d9 | 480 | |
e2fa1520 SH |
481 | ret = reboot(*cmd); |
482 | if (ret == -1 && errno == EINVAL) | |
483 | return 1; | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static int must_drop_cap_sys_boot(void) | |
488 | { | |
489 | FILE *f = fopen("/proc/sys/kernel/ctrl-alt-del", "r"); | |
490 | int ret, cmd, v; | |
491 | long stack_size = 4096; | |
492 | void *stack = alloca(stack_size) + stack_size; | |
493 | int status; | |
494 | pid_t pid; | |
495 | ||
496 | if (!f) { | |
497 | DEBUG("failed to open /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 498 | return 1; |
e2fa1520 | 499 | } |
828695d9 SH |
500 | |
501 | ret = fscanf(f, "%d", &v); | |
502 | fclose(f); | |
e2fa1520 SH |
503 | if (ret != 1) { |
504 | DEBUG("Failed to read /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 505 | return 1; |
e2fa1520 SH |
506 | } |
507 | cmd = v ? LINUX_REBOOT_CMD_CAD_ON : LINUX_REBOOT_CMD_CAD_OFF; | |
508 | ||
509 | pid = clone(container_reboot_supported, stack, CLONE_NEWPID | SIGCHLD, &cmd); | |
510 | if (pid < 0) { | |
511 | SYSERROR("failed to clone\n"); | |
512 | return -1; | |
513 | } | |
514 | if (wait(&status) < 0) { | |
515 | SYSERROR("unexpected wait error: %m\n"); | |
516 | return -1; | |
517 | } | |
518 | ||
519 | if (WEXITSTATUS(status) != 1) | |
828695d9 | 520 | return 1; |
e2fa1520 | 521 | |
828695d9 SH |
522 | return 0; |
523 | } | |
524 | ||
ffe1e01a | 525 | static int do_start(void *data) |
50e98013 | 526 | { |
23c53af9 | 527 | struct lxc_handler *handler = data; |
50e98013 DL |
528 | |
529 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) { | |
530 | SYSERROR("failed to set sigprocmask"); | |
9d7f9e52 | 531 | return -1; |
50e98013 DL |
532 | } |
533 | ||
743ecd2e DL |
534 | /* This prctl must be before the synchro, so if the parent |
535 | * dies before we set the parent death signal, we will detect | |
536 | * its death with the synchro right after, otherwise we have | |
537 | * a window where the parent can exit before we set the pdeath | |
538 | * signal leading to a unsupervized container. | |
539 | */ | |
540 | if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0)) { | |
541 | SYSERROR("failed to set pdeath signal"); | |
542 | return -1; | |
543 | } | |
544 | ||
3c22086f | 545 | lxc_sync_fini_parent(handler); |
50e98013 | 546 | |
3c22086f CLG |
547 | /* Tell the parent task it can begin to configure the |
548 | * container and wait for it to finish | |
549 | */ | |
550 | if (lxc_sync_barrier_parent(handler, LXC_SYNC_CONFIGURE)) | |
9d7f9e52 | 551 | return -1; |
50e98013 | 552 | |
69182a31 | 553 | if (handler->conf->need_utmp_watch) { |
828695d9 SH |
554 | if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) { |
555 | SYSERROR("failed to remove CAP_SYS_BOOT capability"); | |
556 | return -1; | |
557 | } | |
e2fa1520 | 558 | DEBUG("Dropped cap_sys_boot\n"); |
e2fa1520 SH |
559 | } |
560 | ||
561 | /* Setup the container, ip, names, utsname, ... */ | |
562 | if (lxc_setup(handler->name, handler->conf)) { | |
563 | ERROR("failed to setup the container"); | |
564 | goto out_warn_father; | |
565 | } | |
50e98013 | 566 | |
e075f5d9 SH |
567 | if (apparmor_load(handler) < 0) |
568 | goto out_warn_father; | |
569 | ||
8f2c3a70 SH |
570 | if (lxc_seccomp_load(handler->conf) != 0) |
571 | goto out_warn_father; | |
572 | ||
773fb9ca SH |
573 | if (run_lxc_hooks(handler->name, "start", handler->conf)) { |
574 | ERROR("failed to run start hooks for container '%s'.", handler->name); | |
575 | goto out_warn_father; | |
576 | } | |
fc25b815 | 577 | |
773fb9ca | 578 | close(handler->sigfd); |
26ddeedd | 579 | |
e6126dbe MN |
580 | /* after this call, we are in error because this |
581 | * ops should not return as it execs */ | |
23c53af9 | 582 | if (handler->ops->start(handler, handler->data)) |
e6126dbe | 583 | return -1; |
50e98013 DL |
584 | |
585 | out_warn_father: | |
3c22086f | 586 | lxc_sync_wake_parent(handler, LXC_SYNC_POST_CONFIGURE); |
50e98013 DL |
587 | return -1; |
588 | } | |
589 | ||
7b35f3d6 SH |
590 | int save_phys_nics(struct lxc_conf *conf) |
591 | { | |
592 | struct lxc_list *iterator; | |
593 | ||
594 | lxc_list_for_each(iterator, &conf->network) { | |
595 | struct lxc_netdev *netdev = iterator->elem; | |
596 | ||
597 | if (netdev->type != LXC_NET_PHYS) | |
598 | continue; | |
599 | conf->saved_nics = realloc(conf->saved_nics, | |
600 | (conf->num_savednics+1)*sizeof(struct saved_nic)); | |
601 | if (!conf->saved_nics) { | |
602 | SYSERROR("failed to allocate memory"); | |
603 | return -1; | |
604 | } | |
605 | conf->saved_nics[conf->num_savednics].ifindex = netdev->ifindex; | |
606 | conf->saved_nics[conf->num_savednics].orig_name = strdup(netdev->link); | |
607 | if (!conf->saved_nics[conf->num_savednics].orig_name) { | |
608 | SYSERROR("failed to allocate memory"); | |
609 | return -1; | |
610 | } | |
611 | INFO("stored saved_nic #%d idx %d name %s\n", conf->num_savednics, | |
612 | conf->saved_nics[conf->num_savednics].ifindex, | |
613 | conf->saved_nics[conf->num_savednics].orig_name); | |
614 | conf->num_savednics++; | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | ||
23c53af9 | 621 | int lxc_spawn(struct lxc_handler *handler) |
59eb99ba | 622 | { |
99a6af52 | 623 | int failed_before_rename = 0; |
ffe1e01a | 624 | const char *name = handler->name; |
0c547523 | 625 | int pinfd; |
50e98013 | 626 | |
3c22086f | 627 | if (lxc_sync_init(handler)) |
9d7f9e52 | 628 | return -1; |
0ad19a3f | 629 | |
d5088cf2 | 630 | handler->clone_flags = CLONE_NEWUTS|CLONE_NEWPID|CLONE_NEWIPC|CLONE_NEWNS; |
fae349da | 631 | if (!lxc_list_empty(&handler->conf->network)) { |
82d5ae15 | 632 | |
d5088cf2 | 633 | handler->clone_flags |= CLONE_NEWNET; |
0ad19a3f | 634 | |
19a26f82 MK |
635 | /* Find gateway addresses from the link device, which is |
636 | * no longer accessible inside the container. Do this | |
637 | * before creating network interfaces, since goto | |
638 | * out_delete_net does not work before lxc_clone. */ | |
639 | if (lxc_find_gateway_addresses(handler)) { | |
640 | ERROR("failed to find gateway addresses"); | |
641 | lxc_sync_fini(handler); | |
642 | return -1; | |
643 | } | |
644 | ||
82d5ae15 DL |
645 | /* that should be done before the clone because we will |
646 | * fill the netdev index and use them in the child | |
647 | */ | |
e3b4c4c4 | 648 | if (lxc_create_network(handler)) { |
82d5ae15 | 649 | ERROR("failed to create the network"); |
3c22086f | 650 | lxc_sync_fini(handler); |
32e1c760 | 651 | return -1; |
82d5ae15 DL |
652 | } |
653 | } | |
654 | ||
7b35f3d6 SH |
655 | if (save_phys_nics(handler->conf)) { |
656 | ERROR("failed to save physical nic info"); | |
657 | goto out_abort; | |
658 | } | |
659 | ||
0c547523 SH |
660 | /* |
661 | * if the rootfs is not a blockdev, prevent the container from | |
662 | * marking it readonly. | |
663 | */ | |
664 | ||
665 | pinfd = pin_rootfs(handler->conf->rootfs.path); | |
666 | if (pinfd == -1) { | |
667 | ERROR("failed to pin the container's rootfs"); | |
668 | goto out_abort; | |
669 | } | |
670 | ||
0ad19a3f | 671 | /* Create a process in a new set of namespaces */ |
d5088cf2 | 672 | handler->pid = lxc_clone(do_start, handler, handler->clone_flags); |
59eb99ba | 673 | if (handler->pid < 0) { |
36eb9bde | 674 | SYSERROR("failed to fork into a new namespace"); |
7fef7a06 | 675 | goto out_delete_net; |
0ad19a3f | 676 | } |
677 | ||
3c22086f CLG |
678 | lxc_sync_fini_child(handler); |
679 | ||
680 | if (lxc_sync_wait_child(handler, LXC_SYNC_CONFIGURE)) | |
99a6af52 | 681 | failed_before_rename = 1; |
0ad19a3f | 682 | |
36b86299 | 683 | if (lxc_cgroup_create(name, handler->pid)) |
7fef7a06 | 684 | goto out_delete_net; |
218d4250 | 685 | |
99a6af52 MN |
686 | if (failed_before_rename) |
687 | goto out_delete_net; | |
688 | ||
0ad19a3f | 689 | /* Create the network configuration */ |
d5088cf2 | 690 | if (handler->clone_flags & CLONE_NEWNET) { |
fae349da | 691 | if (lxc_assign_network(&handler->conf->network, handler->pid)) { |
82d5ae15 | 692 | ERROR("failed to create the configured network"); |
7fef7a06 | 693 | goto out_delete_net; |
82d5ae15 | 694 | } |
0ad19a3f | 695 | } |
696 | ||
3c22086f CLG |
697 | /* Tell the child to continue its initialization and wait for |
698 | * it to exec or return an error | |
699 | */ | |
700 | if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CONFIGURE)) | |
701 | return -1; | |
0ad19a3f | 702 | |
cc28d0b0 SH |
703 | if (detect_shared_rootfs()) |
704 | umount2(handler->conf->rootfs.mount, MNT_DETACH); | |
705 | ||
706 | if (setup_cgroup(name, &handler->conf->cgroup)) { | |
707 | ERROR("failed to setup the cgroups for '%s'", name); | |
708 | goto out_delete_net; | |
709 | } | |
710 | ||
23c53af9 | 711 | if (handler->ops->post_start(handler, handler->data)) |
e6126dbe MN |
712 | goto out_abort; |
713 | ||
25c2aca5 | 714 | if (lxc_set_state(name, handler, RUNNING)) { |
59eb99ba DL |
715 | ERROR("failed to set state to %s", |
716 | lxc_state2str(RUNNING)); | |
717 | goto out_abort; | |
3f21c114 | 718 | } |
22ebac19 | 719 | |
3c22086f | 720 | lxc_sync_fini(handler); |
0c547523 SH |
721 | |
722 | if (pinfd >= 0) | |
723 | close(pinfd); | |
724 | ||
e6126dbe | 725 | return 0; |
1ac470c0 | 726 | |
7fef7a06 | 727 | out_delete_net: |
d5088cf2 | 728 | if (handler->clone_flags & CLONE_NEWNET) |
74a2b586 | 729 | lxc_delete_network(handler); |
59eb99ba DL |
730 | out_abort: |
731 | lxc_abort(name, handler); | |
3c22086f | 732 | lxc_sync_fini(handler); |
b79fcd86 | 733 | return -1; |
59eb99ba | 734 | } |
0ad19a3f | 735 | |
ee70bf78 CLG |
736 | int __lxc_start(const char *name, struct lxc_conf *conf, |
737 | struct lxc_operations* ops, void *data) | |
59eb99ba | 738 | { |
3a0f472d | 739 | struct lxc_handler *handler; |
e043236e | 740 | int err = -1; |
59eb99ba | 741 | int status; |
80090207 | 742 | |
fae349da | 743 | handler = lxc_init(name, conf); |
3a0f472d | 744 | if (!handler) { |
59eb99ba | 745 | ERROR("failed to initialize the container"); |
66aeffc7 | 746 | return -1; |
0ad19a3f | 747 | } |
ee70bf78 CLG |
748 | handler->ops = ops; |
749 | handler->data = data; | |
e6126dbe | 750 | |
69182a31 | 751 | if (must_drop_cap_sys_boot()) { |
f51db2b3 | 752 | DEBUG("Dropping cap_sys_boot\n"); |
69182a31 SH |
753 | } else { |
754 | DEBUG("Not dropping cap_sys_boot or watching utmp\n"); | |
755 | handler->conf->need_utmp_watch = 0; | |
756 | } | |
757 | ||
23c53af9 | 758 | err = lxc_spawn(handler); |
59eb99ba | 759 | if (err) { |
ee70bf78 | 760 | ERROR("failed to spawn '%s'", name); |
74a2b586 | 761 | goto out_fini_nonet; |
0ad19a3f | 762 | } |
763 | ||
3a0f472d | 764 | err = lxc_poll(name, handler); |
e043236e | 765 | if (err) { |
59eb99ba DL |
766 | ERROR("mainloop exited with an error"); |
767 | goto out_abort; | |
768 | } | |
0ad19a3f | 769 | |
3a0f472d | 770 | while (waitpid(handler->pid, &status, 0) < 0 && errno == EINTR) |
1bc5cc8c | 771 | continue; |
e043236e | 772 | |
8b004f07 SH |
773 | /* |
774 | * If the child process exited but was not signaled, | |
775 | * it didn't call reboot. This should mean it was an | |
776 | * lxc-execute which simply exited. In any case, treat | |
777 | * it as a 'halt' | |
778 | */ | |
779 | if (WIFSIGNALED(status)) { | |
780 | switch(WTERMSIG(status)) { | |
781 | case SIGINT: /* halt */ | |
782 | DEBUG("Container halting"); | |
783 | break; | |
784 | case SIGHUP: /* reboot */ | |
785 | DEBUG("Container rebooting"); | |
786 | handler->conf->reboot = 1; | |
787 | break; | |
788 | default: | |
789 | DEBUG("unknown exit status for init: %d\n", WTERMSIG(status)); | |
790 | break; | |
791 | } | |
828695d9 SH |
792 | } |
793 | ||
7b35f3d6 SH |
794 | lxc_rename_phys_nics_on_shutdown(handler->conf); |
795 | ||
3a0f472d | 796 | err = lxc_error_set_and_log(handler->pid, status); |
9d7f9e52 | 797 | out_fini: |
74a2b586 JK |
798 | lxc_delete_network(handler); |
799 | ||
800 | out_fini_nonet: | |
36b86299 | 801 | lxc_cgroup_destroy(name); |
3a0f472d | 802 | lxc_fini(name, handler); |
0ad19a3f | 803 | return err; |
804 | ||
59eb99ba | 805 | out_abort: |
3a0f472d | 806 | lxc_abort(name, handler); |
9d7f9e52 | 807 | goto out_fini; |
0ad19a3f | 808 | } |
ee70bf78 CLG |
809 | |
810 | struct start_args { | |
811 | char *const *argv; | |
812 | }; | |
813 | ||
814 | static int start(struct lxc_handler *handler, void* data) | |
815 | { | |
816 | struct start_args *arg = data; | |
817 | ||
818 | NOTICE("exec'ing '%s'", arg->argv[0]); | |
819 | ||
820 | execvp(arg->argv[0], arg->argv); | |
821 | SYSERROR("failed to exec %s", arg->argv[0]); | |
822 | return 0; | |
823 | } | |
824 | ||
825 | static int post_start(struct lxc_handler *handler, void* data) | |
826 | { | |
827 | struct start_args *arg = data; | |
828 | ||
829 | NOTICE("'%s' started with pid '%d'", arg->argv[0], handler->pid); | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static struct lxc_operations start_ops = { | |
834 | .start = start, | |
835 | .post_start = post_start | |
836 | }; | |
837 | ||
838 | int lxc_start(const char *name, char *const argv[], struct lxc_conf *conf) | |
839 | { | |
840 | struct start_args start_arg = { | |
841 | .argv = argv, | |
842 | }; | |
843 | ||
b119f362 | 844 | if (lxc_check_inherited(conf, -1)) |
ee70bf78 CLG |
845 | return -1; |
846 | ||
828695d9 | 847 | conf->need_utmp_watch = 1; |
ee70bf78 CLG |
848 | return __lxc_start(name, conf, &start_ops, &start_arg); |
849 | } |