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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #ifndef _GNU_SOURCE | |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
6 | #include <dirent.h> | |
7 | #include <errno.h> | |
8 | #include <fcntl.h> | |
9 | #include <grp.h> | |
10 | #include <poll.h> | |
11 | #include <pthread.h> | |
12 | #include <signal.h> | |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <sys/file.h> | |
17 | #include <sys/mount.h> | |
18 | #include <sys/param.h> | |
19 | #include <sys/prctl.h> | |
20 | #include <sys/socket.h> | |
21 | #include <sys/stat.h> | |
22 | #include <sys/syscall.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/un.h> | |
25 | #include <sys/wait.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include "af_unix.h" | |
29 | #include "caps.h" | |
30 | #include "cgroup.h" | |
31 | #include "commands.h" | |
32 | #include "commands_utils.h" | |
33 | #include "compiler.h" | |
34 | #include "conf.h" | |
35 | #include "config.h" | |
36 | #include "confile_utils.h" | |
37 | #include "error.h" | |
38 | #include "file_utils.h" | |
39 | #include "list.h" | |
40 | #include "log.h" | |
41 | #include "lsm/lsm.h" | |
42 | #include "lxccontainer.h" | |
43 | #include "lxclock.h" | |
44 | #include "lxcseccomp.h" | |
45 | #include "macro.h" | |
46 | #include "mainloop.h" | |
47 | #include "memory_utils.h" | |
48 | #include "monitor.h" | |
49 | #include "namespace.h" | |
50 | #include "network.h" | |
51 | #include "process_utils.h" | |
52 | #include "start.h" | |
53 | #include "storage/storage.h" | |
54 | #include "storage/storage_utils.h" | |
55 | #include "sync.h" | |
56 | #include "syscall_wrappers.h" | |
57 | #include "terminal.h" | |
58 | #include "utils.h" | |
59 | ||
60 | #if HAVE_LIBCAP | |
61 | #include <sys/capability.h> | |
62 | #endif | |
63 | ||
64 | #ifndef HAVE_STRLCPY | |
65 | #include "include/strlcpy.h" | |
66 | #endif | |
67 | ||
68 | lxc_log_define(start, lxc); | |
69 | ||
70 | extern void mod_all_rdeps(struct lxc_container *c, bool inc); | |
71 | static bool do_destroy_container(struct lxc_handler *handler); | |
72 | static int lxc_rmdir_onedev_wrapper(void *data); | |
73 | static void lxc_destroy_container_on_signal(struct lxc_handler *handler, | |
74 | const char *name); | |
75 | ||
76 | static void print_top_failing_dir(const char *path) | |
77 | { | |
78 | __do_free char *copy = NULL; | |
79 | int ret; | |
80 | char *e, *p, saved; | |
81 | ||
82 | copy = must_copy_string(path); | |
83 | p = copy; | |
84 | e = copy + strlen(path); | |
85 | ||
86 | while (p < e) { | |
87 | while (p < e && *p == '/') | |
88 | p++; | |
89 | ||
90 | while (p < e && *p != '/') | |
91 | p++; | |
92 | ||
93 | saved = *p; | |
94 | *p = '\0'; | |
95 | ||
96 | ret = access(copy, X_OK); | |
97 | if (ret != 0) { | |
98 | SYSERROR("Could not access %s. Please grant it x access, or add an ACL for the container " "root", copy); | |
99 | return; | |
100 | } | |
101 | *p = saved; | |
102 | } | |
103 | } | |
104 | ||
105 | static void lxc_put_nsfds(struct lxc_handler *handler) | |
106 | { | |
107 | for (int i = 0; i < LXC_NS_MAX; i++) { | |
108 | if (handler->nsfd[i] < 0) | |
109 | continue; | |
110 | ||
111 | close_prot_errno_disarm(handler->nsfd[i]); | |
112 | } | |
113 | } | |
114 | ||
115 | static int lxc_try_preserve_ns(const int pid, const char *ns) | |
116 | { | |
117 | int fd; | |
118 | ||
119 | fd = lxc_preserve_ns(pid, ns); | |
120 | if (fd < 0) { | |
121 | if (errno != ENOENT) | |
122 | return log_error_errno(-EINVAL, | |
123 | errno, "Failed to preserve %s namespace", | |
124 | ns); | |
125 | ||
126 | return log_warn_errno(-EOPNOTSUPP, | |
127 | errno, "Kernel does not support preserving %s namespaces", | |
128 | ns); | |
129 | } | |
130 | ||
131 | return fd; | |
132 | } | |
133 | ||
134 | /* lxc_try_preserve_namespaces: open /proc/@pid/ns/@ns for each namespace | |
135 | * specified in ns_clone_flags. | |
136 | * Return true on success, false on failure. | |
137 | */ | |
138 | static bool lxc_try_preserve_namespaces(struct lxc_handler *handler, | |
139 | int ns_clone_flags, pid_t pid) | |
140 | { | |
141 | int i; | |
142 | ||
143 | for (i = 0; i < LXC_NS_MAX; i++) | |
144 | handler->nsfd[i] = -EBADF; | |
145 | ||
146 | for (i = 0; i < LXC_NS_MAX; i++) { | |
147 | int fd; | |
148 | ||
149 | if ((ns_clone_flags & ns_info[i].clone_flag) == 0) | |
150 | continue; | |
151 | ||
152 | fd = lxc_try_preserve_ns(pid, ns_info[i].proc_name); | |
153 | if (fd < 0) { | |
154 | /* Do not fail to start container on kernels that do | |
155 | * not support interacting with namespaces through | |
156 | * /proc. | |
157 | */ | |
158 | if (fd == -EOPNOTSUPP) | |
159 | continue; | |
160 | ||
161 | lxc_put_nsfds(handler); | |
162 | return false; | |
163 | } | |
164 | ||
165 | handler->nsfd[i] = fd; | |
166 | DEBUG("Preserved %s namespace via fd %d", ns_info[i].proc_name, | |
167 | handler->nsfd[i]); | |
168 | } | |
169 | ||
170 | return true; | |
171 | } | |
172 | ||
173 | static inline bool match_stdfds(int fd) | |
174 | { | |
175 | return (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO); | |
176 | } | |
177 | ||
178 | #ifdef HAVE_DLOG | |
179 | static bool match_dlog_fds(struct dirent *direntp) | |
180 | { | |
181 | char path[PATH_MAX] = {0}; | |
182 | char link[PATH_MAX] = {0}; | |
183 | ssize_t linklen; | |
184 | int ret; | |
185 | ||
186 | ret = snprintf(path, PATH_MAX, "/proc/self/fd/%s", direntp->d_name); | |
187 | if (ret < 0 || ret >= PATH_MAX) | |
188 | return log_error(false, "Failed to create file descriptor name"); | |
189 | ||
190 | linklen = readlink(path, link, PATH_MAX); | |
191 | if (linklen < 0) | |
192 | return log_error(false, "Failed to read link path - \"%s\"", path); | |
193 | else if (linklen >= PATH_MAX) | |
194 | return log_error(false, "The name of link path is too long - \"%s\"", path); | |
195 | ||
196 | if (strcmp(link, "/dev/log_main") == 0 || | |
197 | strcmp(link, "/dev/log_system") == 0 || | |
198 | strcmp(link, "/dev/log_radio") == 0) | |
199 | return true; | |
200 | ||
201 | return false; | |
202 | } | |
203 | #endif | |
204 | ||
205 | int lxc_check_inherited(struct lxc_conf *conf, bool closeall, | |
206 | int *fds_to_ignore, size_t len_fds) | |
207 | { | |
208 | int fd, fddir; | |
209 | size_t i; | |
210 | DIR *dir; | |
211 | struct dirent *direntp; | |
212 | ||
213 | if (conf && conf->close_all_fds) | |
214 | closeall = true; | |
215 | ||
216 | /* | |
217 | * Disable syslog at this point to avoid the above logging | |
218 | * function to open a new fd and make the check_inherited function | |
219 | * enter an infinite loop. | |
220 | */ | |
221 | lxc_log_syslog_disable(); | |
222 | ||
223 | restart: | |
224 | dir = opendir("/proc/self/fd"); | |
225 | if (!dir) | |
226 | return log_warn(-1, "Failed to open directory"); | |
227 | ||
228 | fddir = dirfd(dir); | |
229 | ||
230 | while ((direntp = readdir(dir))) { | |
231 | int ret; | |
232 | struct lxc_list *cur; | |
233 | bool matched = false; | |
234 | ||
235 | if (strcmp(direntp->d_name, ".") == 0) | |
236 | continue; | |
237 | ||
238 | if (strcmp(direntp->d_name, "..") == 0) | |
239 | continue; | |
240 | ||
241 | ret = lxc_safe_int(direntp->d_name, &fd); | |
242 | if (ret < 0) { | |
243 | INFO("Could not parse file descriptor for \"%s\"", direntp->d_name); | |
244 | continue; | |
245 | } | |
246 | ||
247 | for (i = 0; i < len_fds; i++) | |
248 | if (fds_to_ignore[i] == fd) | |
249 | break; | |
250 | ||
251 | if (fd == fddir || fd == lxc_log_fd || | |
252 | (i < len_fds && fd == fds_to_ignore[i])) | |
253 | continue; | |
254 | ||
255 | /* Keep state clients that wait on reboots. */ | |
256 | if (conf) { | |
257 | lxc_list_for_each(cur, &conf->state_clients) { | |
258 | struct lxc_state_client *client = cur->elem; | |
259 | ||
260 | if (client->clientfd != fd) | |
261 | continue; | |
262 | ||
263 | matched = true; | |
264 | break; | |
265 | } | |
266 | } | |
267 | ||
268 | if (matched) | |
269 | continue; | |
270 | ||
271 | if (current_config && fd == current_config->logfd) | |
272 | continue; | |
273 | ||
274 | if (match_stdfds(fd)) | |
275 | continue; | |
276 | ||
277 | #ifdef HAVE_DLOG | |
278 | if (match_dlog_fds(direntp)) | |
279 | continue; | |
280 | ||
281 | #endif | |
282 | if (closeall) { | |
283 | if (close(fd)) | |
284 | SYSINFO("Closed inherited fd %d", fd); | |
285 | else | |
286 | INFO("Closed inherited fd %d", fd); | |
287 | closedir(dir); | |
288 | goto restart; | |
289 | } | |
290 | WARN("Inherited fd %d", fd); | |
291 | } | |
292 | closedir(dir); | |
293 | ||
294 | /* | |
295 | * Only enable syslog at this point to avoid the above logging | |
296 | * function to open a new fd and make the check_inherited function | |
297 | * enter an infinite loop. | |
298 | */ | |
299 | lxc_log_syslog_enable(); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int setup_signal_fd(sigset_t *oldmask) | |
305 | { | |
306 | int ret; | |
307 | sigset_t mask; | |
308 | const int signals[] = {SIGBUS, SIGILL, SIGSEGV, SIGWINCH}; | |
309 | ||
310 | /* Block everything except serious error signals. */ | |
311 | ret = sigfillset(&mask); | |
312 | if (ret < 0) | |
313 | return -EBADF; | |
314 | ||
315 | for (int sig = 0; sig < (sizeof(signals) / sizeof(signals[0])); sig++) { | |
316 | ret = sigdelset(&mask, signals[sig]); | |
317 | if (ret < 0) | |
318 | return -EBADF; | |
319 | } | |
320 | ||
321 | ret = pthread_sigmask(SIG_BLOCK, &mask, oldmask); | |
322 | if (ret < 0) | |
323 | return log_error_errno(-EBADF, errno, | |
324 | "Failed to set signal mask"); | |
325 | ||
326 | ret = signalfd(-1, &mask, SFD_CLOEXEC); | |
327 | if (ret < 0) | |
328 | return log_error_errno(-EBADF, | |
329 | errno, "Failed to create signal file descriptor"); | |
330 | ||
331 | TRACE("Created signal file descriptor %d", ret); | |
332 | ||
333 | return ret; | |
334 | } | |
335 | ||
336 | static int signal_handler(int fd, uint32_t events, void *data, | |
337 | struct lxc_epoll_descr *descr) | |
338 | { | |
339 | int ret; | |
340 | siginfo_t info; | |
341 | struct signalfd_siginfo siginfo; | |
342 | struct lxc_handler *hdlr = data; | |
343 | ||
344 | ret = lxc_read_nointr(fd, &siginfo, sizeof(siginfo)); | |
345 | if (ret < 0) | |
346 | return log_error(LXC_MAINLOOP_ERROR, "Failed to read signal info from signal file descriptor %d", fd); | |
347 | ||
348 | if (ret != sizeof(siginfo)) | |
349 | return log_error(LXC_MAINLOOP_ERROR, "Unexpected size for struct signalfd_siginfo"); | |
350 | ||
351 | /* Check whether init is running. */ | |
352 | info.si_pid = 0; | |
353 | ret = waitid(P_PID, hdlr->pid, &info, WEXITED | WNOWAIT | WNOHANG); | |
354 | if (ret == 0 && info.si_pid == hdlr->pid) | |
355 | hdlr->init_died = true; | |
356 | ||
357 | /* Try to figure out a reasonable exit status to report. */ | |
358 | if (hdlr->init_died) { | |
359 | switch (info.si_code) { | |
360 | case CLD_EXITED: | |
361 | hdlr->exit_status = info.si_status << 8; | |
362 | break; | |
363 | case CLD_KILLED: | |
364 | case CLD_DUMPED: | |
365 | case CLD_STOPPED: | |
366 | hdlr->exit_status = info.si_status << 8 | 0x7f; | |
367 | break; | |
368 | case CLD_CONTINUED: | |
369 | /* Huh? The waitid() told us it's dead *and* continued? */ | |
370 | WARN("Init %d dead and continued?", hdlr->pid); | |
371 | hdlr->exit_status = 1; | |
372 | break; | |
373 | default: | |
374 | ERROR("Unknown si_code: %d", info.si_code); | |
375 | hdlr->exit_status = 1; | |
376 | } | |
377 | } | |
378 | ||
379 | if (siginfo.ssi_signo == SIGHUP) { | |
380 | if (hdlr->pidfd >= 0) | |
381 | lxc_raw_pidfd_send_signal(hdlr->pidfd, SIGTERM, NULL, 0); | |
382 | else | |
383 | kill(hdlr->pid, SIGTERM); | |
384 | INFO("Killing %d since terminal hung up", hdlr->pid); | |
385 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE | |
386 | : LXC_MAINLOOP_CONTINUE; | |
387 | } | |
388 | ||
389 | if (siginfo.ssi_signo != SIGCHLD) { | |
390 | if (hdlr->pidfd >= 0) | |
391 | lxc_raw_pidfd_send_signal(hdlr->pidfd, | |
392 | siginfo.ssi_signo, NULL, 0); | |
393 | else | |
394 | kill(hdlr->pid, siginfo.ssi_signo); | |
395 | INFO("Forwarded signal %d to pid %d", siginfo.ssi_signo, hdlr->pid); | |
396 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE | |
397 | : LXC_MAINLOOP_CONTINUE; | |
398 | } | |
399 | ||
400 | /* More robustness, protect ourself from a SIGCHLD sent | |
401 | * by a process different from the container init. | |
402 | */ | |
403 | if (siginfo.ssi_pid != hdlr->pid) { | |
404 | NOTICE("Received %d from pid %d instead of container init %d", | |
405 | siginfo.ssi_signo, siginfo.ssi_pid, hdlr->pid); | |
406 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE | |
407 | : LXC_MAINLOOP_CONTINUE; | |
408 | } | |
409 | ||
410 | if (siginfo.ssi_code == CLD_STOPPED) { | |
411 | INFO("Container init process was stopped"); | |
412 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE | |
413 | : LXC_MAINLOOP_CONTINUE; | |
414 | } | |
415 | ||
416 | if (siginfo.ssi_code == CLD_CONTINUED) { | |
417 | INFO("Container init process was continued"); | |
418 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE | |
419 | : LXC_MAINLOOP_CONTINUE; | |
420 | } | |
421 | ||
422 | return log_debug(LXC_MAINLOOP_CLOSE, "Container init process %d exited", hdlr->pid); | |
423 | } | |
424 | ||
425 | int lxc_serve_state_clients(const char *name, struct lxc_handler *handler, | |
426 | lxc_state_t state) | |
427 | { | |
428 | size_t retlen; | |
429 | ssize_t ret; | |
430 | struct lxc_list *cur, *next; | |
431 | struct lxc_msg msg = {.type = lxc_msg_state, .value = state}; | |
432 | ||
433 | if (state == THAWED) | |
434 | handler->state = RUNNING; | |
435 | else | |
436 | handler->state = state; | |
437 | ||
438 | TRACE("Set container state to %s", lxc_state2str(state)); | |
439 | ||
440 | if (lxc_list_empty(&handler->conf->state_clients)) | |
441 | return log_trace(0, "No state clients registered"); | |
442 | ||
443 | retlen = strlcpy(msg.name, name, sizeof(msg.name)); | |
444 | if (retlen >= sizeof(msg.name)) | |
445 | return -E2BIG; | |
446 | ||
447 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { | |
448 | struct lxc_state_client *client = cur->elem; | |
449 | ||
450 | if (client->states[state] == 0) { | |
451 | TRACE("State %s not registered for state client %d", | |
452 | lxc_state2str(state), client->clientfd); | |
453 | continue; | |
454 | } | |
455 | ||
456 | TRACE("Sending state %s to state client %d", | |
457 | lxc_state2str(state), client->clientfd); | |
458 | ||
459 | ret = lxc_send_nointr(client->clientfd, &msg, sizeof(msg), MSG_NOSIGNAL); | |
460 | if (ret <= 0) | |
461 | SYSERROR("Failed to send message to client"); | |
462 | ||
463 | /* kick client from list */ | |
464 | lxc_list_del(cur); | |
465 | close(client->clientfd); | |
466 | free(cur->elem); | |
467 | free(cur); | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int lxc_serve_state_socket_pair(const char *name, | |
474 | struct lxc_handler *handler, | |
475 | lxc_state_t state) | |
476 | { | |
477 | ssize_t ret; | |
478 | ||
479 | if (!handler->daemonize || | |
480 | handler->state_socket_pair[1] < 0 || | |
481 | state == STARTING) | |
482 | return 0; | |
483 | ||
484 | /* Close read end of the socket pair. */ | |
485 | close_prot_errno_disarm(handler->state_socket_pair[0]); | |
486 | ||
487 | again: | |
488 | ret = lxc_abstract_unix_send_credential(handler->state_socket_pair[1], | |
489 | &(int){state}, sizeof(int)); | |
490 | if (ret < 0) { | |
491 | SYSERROR("Failed to send state to %d", handler->state_socket_pair[1]); | |
492 | ||
493 | if (errno == EINTR) | |
494 | goto again; | |
495 | ||
496 | return -1; | |
497 | } | |
498 | ||
499 | if (ret != sizeof(int)) | |
500 | return log_error(-1, "Message too long : %d", handler->state_socket_pair[1]); | |
501 | ||
502 | TRACE("Sent container state \"%s\" to %d", lxc_state2str(state), | |
503 | handler->state_socket_pair[1]); | |
504 | ||
505 | /* Close write end of the socket pair. */ | |
506 | close_prot_errno_disarm(handler->state_socket_pair[1]); | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | int lxc_set_state(const char *name, struct lxc_handler *handler, | |
512 | lxc_state_t state) | |
513 | { | |
514 | int ret; | |
515 | ||
516 | ret = lxc_serve_state_socket_pair(name, handler, state); | |
517 | if (ret < 0) | |
518 | return log_error(-1, "Failed to synchronize via anonymous pair of unix sockets"); | |
519 | ||
520 | ret = lxc_serve_state_clients(name, handler, state); | |
521 | if (ret < 0) | |
522 | return -1; | |
523 | ||
524 | /* This function will try to connect to the legacy lxc-monitord state | |
525 | * server and only exists for backwards compatibility. | |
526 | */ | |
527 | lxc_monitor_send_state(name, state, handler->lxcpath); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | int lxc_poll(const char *name, struct lxc_handler *handler) | |
533 | { | |
534 | int ret; | |
535 | bool has_console = true; | |
536 | struct lxc_epoll_descr descr, descr_console; | |
537 | ||
538 | if (handler->conf->console.path && | |
539 | strcmp(handler->conf->console.path, "none") == 0) | |
540 | has_console = false; | |
541 | ||
542 | ret = lxc_mainloop_open(&descr); | |
543 | if (ret < 0) { | |
544 | ERROR("Failed to create mainloop"); | |
545 | goto out_sigfd; | |
546 | } | |
547 | ||
548 | if (has_console) { | |
549 | ret = lxc_mainloop_open(&descr_console); | |
550 | if (ret < 0) { | |
551 | ERROR("Failed to create console mainloop"); | |
552 | goto out_mainloop; | |
553 | } | |
554 | } | |
555 | ||
556 | ret = lxc_mainloop_add_handler(&descr, handler->sigfd, signal_handler, handler); | |
557 | if (ret < 0) { | |
558 | ERROR("Failed to add signal handler for %d to mainloop", handler->sigfd); | |
559 | goto out_mainloop_console; | |
560 | } | |
561 | ||
562 | ret = lxc_seccomp_setup_proxy(&handler->conf->seccomp, &descr, handler); | |
563 | if (ret < 0) { | |
564 | ERROR("Failed to setup seccomp proxy"); | |
565 | goto out_mainloop_console; | |
566 | } | |
567 | ||
568 | if (has_console) { | |
569 | struct lxc_terminal *console = &handler->conf->console; | |
570 | ||
571 | ret = lxc_terminal_mainloop_add(&descr, console); | |
572 | if (ret < 0) { | |
573 | ERROR("Failed to add console handlers to mainloop"); | |
574 | goto out_mainloop_console; | |
575 | } | |
576 | ||
577 | ret = lxc_terminal_mainloop_add(&descr_console, console); | |
578 | if (ret < 0) { | |
579 | ERROR("Failed to add console handlers to console mainloop"); | |
580 | goto out_mainloop_console; | |
581 | } | |
582 | ||
583 | handler->conf->console.descr = &descr; | |
584 | } | |
585 | ||
586 | ret = lxc_cmd_mainloop_add(name, &descr, handler); | |
587 | if (ret < 0) { | |
588 | ERROR("Failed to add command handler to mainloop"); | |
589 | goto out_mainloop_console; | |
590 | } | |
591 | ||
592 | TRACE("Mainloop is ready"); | |
593 | ||
594 | ret = lxc_mainloop(&descr, -1); | |
595 | close_prot_errno_disarm(descr.epfd); | |
596 | if (ret < 0 || !handler->init_died) | |
597 | goto out_mainloop_console; | |
598 | ||
599 | if (has_console) | |
600 | ret = lxc_mainloop(&descr_console, 0); | |
601 | ||
602 | out_mainloop_console: | |
603 | if (has_console) { | |
604 | lxc_mainloop_close(&descr_console); | |
605 | TRACE("Closed console mainloop"); | |
606 | } | |
607 | ||
608 | out_mainloop: | |
609 | lxc_mainloop_close(&descr); | |
610 | TRACE("Closed mainloop"); | |
611 | ||
612 | out_sigfd: | |
613 | TRACE("Closed signal file descriptor %d", handler->sigfd); | |
614 | close_prot_errno_disarm(handler->sigfd); | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
619 | void lxc_put_handler(struct lxc_handler *handler) | |
620 | { | |
621 | close_prot_errno_disarm(handler->pidfd); | |
622 | close_prot_errno_disarm(handler->sigfd); | |
623 | lxc_put_nsfds(handler); | |
624 | if (handler->conf && handler->conf->reboot == REBOOT_NONE) | |
625 | close_prot_errno_disarm(handler->conf->maincmd_fd); | |
626 | close_prot_errno_disarm(handler->monitor_status_fd); | |
627 | close_prot_errno_disarm(handler->state_socket_pair[0]); | |
628 | close_prot_errno_disarm(handler->state_socket_pair[1]); | |
629 | cgroup_exit(handler->cgroup_ops); | |
630 | if (handler->conf && handler->conf->reboot == REBOOT_NONE) | |
631 | free_disarm(handler); | |
632 | else | |
633 | handler->conf = NULL; | |
634 | } | |
635 | ||
636 | struct lxc_handler *lxc_init_handler(struct lxc_handler *old, | |
637 | const char *name, struct lxc_conf *conf, | |
638 | const char *lxcpath, bool daemonize) | |
639 | { | |
640 | int nr_keep_fds = 0; | |
641 | int ret; | |
642 | struct lxc_handler *handler; | |
643 | ||
644 | if (!old) | |
645 | handler = zalloc(sizeof(*handler)); | |
646 | else | |
647 | handler = old; | |
648 | if (!handler) | |
649 | return NULL; | |
650 | ||
651 | /* Note that am_guest_unpriv() checks the effective uid. We | |
652 | * probably don't care if we are real root only if we are running | |
653 | * as root so this should be fine. | |
654 | */ | |
655 | handler->am_root = !am_guest_unpriv(); | |
656 | handler->conf = conf; | |
657 | handler->lxcpath = lxcpath; | |
658 | handler->init_died = false; | |
659 | handler->data_sock[0] = -EBADF; | |
660 | handler->data_sock[1] = -EBADF; | |
661 | handler->monitor_status_fd = -EBADF; | |
662 | handler->pidfd = -EBADF; | |
663 | handler->sigfd = -EBADF; | |
664 | handler->state_socket_pair[0] = -EBADF; | |
665 | handler->state_socket_pair[1] = -EBADF; | |
666 | if (handler->conf->reboot == REBOOT_NONE) | |
667 | lxc_list_init(&handler->conf->state_clients); | |
668 | ||
669 | for (int i = 0; i < LXC_NS_MAX; i++) | |
670 | handler->nsfd[i] = -EBADF; | |
671 | ||
672 | handler->name = name; | |
673 | if (daemonize) | |
674 | handler->transient_pid = lxc_raw_getpid(); | |
675 | else | |
676 | handler->transient_pid = -1; | |
677 | ||
678 | if (daemonize && handler->conf->reboot == REBOOT_NONE) { | |
679 | /* Create socketpair() to synchronize on daemonized startup. | |
680 | * When the container reboots we don't need to synchronize | |
681 | * again currently so don't open another socketpair(). | |
682 | */ | |
683 | ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, | |
684 | handler->state_socket_pair); | |
685 | if (ret < 0) { | |
686 | ERROR("Failed to create anonymous pair of unix sockets"); | |
687 | goto on_error; | |
688 | } | |
689 | ||
690 | TRACE("Created anonymous pair {%d,%d} of unix sockets", | |
691 | handler->state_socket_pair[0], | |
692 | handler->state_socket_pair[1]); | |
693 | handler->keep_fds[nr_keep_fds++] = handler->state_socket_pair[0]; | |
694 | handler->keep_fds[nr_keep_fds++] = handler->state_socket_pair[1]; | |
695 | } | |
696 | ||
697 | if (handler->conf->reboot == REBOOT_NONE) { | |
698 | handler->conf->maincmd_fd = lxc_cmd_init(name, lxcpath, "command"); | |
699 | if (handler->conf->maincmd_fd < 0) { | |
700 | ERROR("Failed to set up command socket"); | |
701 | goto on_error; | |
702 | } | |
703 | handler->keep_fds[nr_keep_fds++] = handler->conf->maincmd_fd; | |
704 | } | |
705 | ||
706 | TRACE("Unix domain socket %d for command server is ready", | |
707 | handler->conf->maincmd_fd); | |
708 | ||
709 | return handler; | |
710 | ||
711 | on_error: | |
712 | lxc_put_handler(handler); | |
713 | ||
714 | return NULL; | |
715 | } | |
716 | ||
717 | int lxc_init(const char *name, struct lxc_handler *handler) | |
718 | { | |
719 | __do_close int status_fd = -EBADF; | |
720 | int ret; | |
721 | const char *loglevel; | |
722 | struct lxc_conf *conf = handler->conf; | |
723 | ||
724 | handler->monitor_pid = lxc_raw_getpid(); | |
725 | status_fd = open("/proc/self/status", O_RDONLY | O_CLOEXEC); | |
726 | if (status_fd < 0) | |
727 | return log_error_errno(-1, errno, "Failed to open monitor status fd"); | |
728 | ||
729 | handler->lsm_ops = lsm_init_static(); | |
730 | TRACE("Initialized LSM"); | |
731 | ||
732 | /* Begin by setting the state to STARTING. */ | |
733 | ret = lxc_set_state(name, handler, STARTING); | |
734 | if (ret < 0) | |
735 | return log_error(-1, "Failed to set state to \"%s\"", lxc_state2str(STARTING)); | |
736 | TRACE("Set container state to \"STARTING\""); | |
737 | ||
738 | /* Start of environment variable setup for hooks. */ | |
739 | ret = setenv("LXC_NAME", name, 1); | |
740 | if (ret < 0) | |
741 | SYSERROR("Failed to set environment variable: LXC_NAME=%s", name); | |
742 | ||
743 | if (conf->rcfile) { | |
744 | ret = setenv("LXC_CONFIG_FILE", conf->rcfile, 1); | |
745 | if (ret < 0) | |
746 | SYSERROR("Failed to set environment variable: LXC_CONFIG_FILE=%s", conf->rcfile); | |
747 | } | |
748 | ||
749 | if (conf->rootfs.mount) { | |
750 | ret = setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1); | |
751 | if (ret < 0) | |
752 | SYSERROR("Failed to set environment variable: LXC_ROOTFS_MOUNT=%s", conf->rootfs.mount); | |
753 | } | |
754 | ||
755 | if (conf->rootfs.path) { | |
756 | ret = setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1); | |
757 | if (ret < 0) | |
758 | SYSERROR("Failed to set environment variable: LXC_ROOTFS_PATH=%s", conf->rootfs.path); | |
759 | } | |
760 | ||
761 | if (conf->console.path) { | |
762 | ret = setenv("LXC_CONSOLE", conf->console.path, 1); | |
763 | if (ret < 0) | |
764 | SYSERROR("Failed to set environment variable: LXC_CONSOLE=%s", conf->console.path); | |
765 | } | |
766 | ||
767 | if (conf->console.log_path) { | |
768 | ret = setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1); | |
769 | if (ret < 0) | |
770 | SYSERROR("Failed to set environment variable: LXC_CONSOLE_LOGPATH=%s", conf->console.log_path); | |
771 | } | |
772 | ||
773 | if (cgns_supported()) { | |
774 | ret = setenv("LXC_CGNS_AWARE", "1", 1); | |
775 | if (ret < 0) | |
776 | SYSERROR("Failed to set environment variable LXC_CGNS_AWARE=1"); | |
777 | } | |
778 | ||
779 | loglevel = lxc_log_priority_to_string(lxc_log_get_level()); | |
780 | ret = setenv("LXC_LOG_LEVEL", loglevel, 1); | |
781 | if (ret < 0) | |
782 | SYSERROR("Set environment variable LXC_LOG_LEVEL=%s", loglevel); | |
783 | ||
784 | if (conf->hooks_version == 0) | |
785 | ret = setenv("LXC_HOOK_VERSION", "0", 1); | |
786 | else | |
787 | ret = setenv("LXC_HOOK_VERSION", "1", 1); | |
788 | if (ret < 0) | |
789 | SYSERROR("Failed to set environment variable LXC_HOOK_VERSION=%u", conf->hooks_version); | |
790 | /* End of environment variable setup for hooks. */ | |
791 | ||
792 | TRACE("Set environment variables"); | |
793 | ||
794 | ret = run_lxc_hooks(name, "pre-start", conf, NULL); | |
795 | if (ret < 0) | |
796 | return log_error(-1, "Failed to run lxc.hook.pre-start for container \"%s\"", name); | |
797 | TRACE("Ran pre-start hooks"); | |
798 | ||
799 | /* The signal fd has to be created before forking otherwise if the child | |
800 | * process exits before we setup the signal fd, the event will be lost | |
801 | * and the command will be stuck. | |
802 | */ | |
803 | handler->sigfd = setup_signal_fd(&handler->oldmask); | |
804 | if (handler->sigfd < 0) | |
805 | return log_error(-1, "Failed to setup SIGCHLD fd handler."); | |
806 | TRACE("Set up signal fd"); | |
807 | ||
808 | /* Do this after setting up signals since it might unblock SIGWINCH. */ | |
809 | ret = lxc_terminal_setup(conf); | |
810 | if (ret < 0) { | |
811 | ERROR("Failed to create console"); | |
812 | goto out_restore_sigmask; | |
813 | } | |
814 | TRACE("Created console"); | |
815 | ||
816 | handler->cgroup_ops = cgroup_init(handler->conf); | |
817 | if (!handler->cgroup_ops) { | |
818 | ERROR("Failed to initialize cgroup driver"); | |
819 | goto out_delete_terminal; | |
820 | } | |
821 | TRACE("Initialized cgroup driver"); | |
822 | ||
823 | ret = lxc_read_seccomp_config(conf); | |
824 | if (ret < 0) | |
825 | return log_error(-1, "Failed loading seccomp policy"); | |
826 | TRACE("Read seccomp policy"); | |
827 | ||
828 | ret = handler->lsm_ops->prepare(handler->lsm_ops, conf, handler->lxcpath); | |
829 | if (ret < 0) { | |
830 | ERROR("Failed to initialize LSM"); | |
831 | goto out_delete_terminal; | |
832 | } | |
833 | TRACE("Initialized LSM"); | |
834 | ||
835 | INFO("Container \"%s\" is initialized", name); | |
836 | handler->monitor_status_fd = move_fd(status_fd); | |
837 | return 0; | |
838 | ||
839 | out_delete_terminal: | |
840 | lxc_terminal_delete(&handler->conf->console); | |
841 | ||
842 | out_restore_sigmask: | |
843 | (void)pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); | |
844 | ||
845 | return -1; | |
846 | } | |
847 | ||
848 | void lxc_end(struct lxc_handler *handler) | |
849 | { | |
850 | int ret; | |
851 | pid_t self; | |
852 | struct lxc_list *cur, *next; | |
853 | char *namespaces[LXC_NS_MAX + 1]; | |
854 | size_t namespace_count = 0; | |
855 | const char *name = handler->name; | |
856 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; | |
857 | ||
858 | /* The STOPPING state is there for future cleanup code which can take | |
859 | * awhile. | |
860 | */ | |
861 | lxc_set_state(name, handler, STOPPING); | |
862 | ||
863 | self = lxc_raw_getpid(); | |
864 | for (int i = 0; i < LXC_NS_MAX; i++) { | |
865 | if (handler->nsfd[i] < 0) | |
866 | continue; | |
867 | ||
868 | if (handler->conf->hooks_version == 0) | |
869 | ret = asprintf(&namespaces[namespace_count], | |
870 | "%s:/proc/%d/fd/%d", ns_info[i].proc_name, | |
871 | self, handler->nsfd[i]); | |
872 | else | |
873 | ret = asprintf(&namespaces[namespace_count], | |
874 | "/proc/%d/fd/%d", self, handler->nsfd[i]); | |
875 | if (ret < 0) { | |
876 | SYSERROR("Failed to allocate memory"); | |
877 | break; | |
878 | } | |
879 | ||
880 | if (handler->conf->hooks_version == 0) { | |
881 | namespace_count++; | |
882 | continue; | |
883 | } | |
884 | ||
885 | ret = setenv(ns_info[i].env_name, namespaces[namespace_count], 1); | |
886 | if (ret < 0) | |
887 | SYSERROR("Failed to set environment variable %s=%s", | |
888 | ns_info[i].env_name, namespaces[namespace_count]); | |
889 | else | |
890 | TRACE("Set environment variable %s=%s", | |
891 | ns_info[i].env_name, namespaces[namespace_count]); | |
892 | ||
893 | namespace_count++; | |
894 | } | |
895 | namespaces[namespace_count] = NULL; | |
896 | ||
897 | if (handler->conf->reboot > REBOOT_NONE) { | |
898 | ret = setenv("LXC_TARGET", "reboot", 1); | |
899 | if (ret < 0) | |
900 | SYSERROR("Failed to set environment variable: LXC_TARGET=reboot"); | |
901 | } | |
902 | ||
903 | if (handler->conf->reboot == REBOOT_NONE) { | |
904 | ret = setenv("LXC_TARGET", "stop", 1); | |
905 | if (ret < 0) | |
906 | SYSERROR("Failed to set environment variable: LXC_TARGET=stop"); | |
907 | } | |
908 | ||
909 | if (handler->conf->hooks_version == 0) | |
910 | ret = run_lxc_hooks(name, "stop", handler->conf, namespaces); | |
911 | else | |
912 | ret = run_lxc_hooks(name, "stop", handler->conf, NULL); | |
913 | if (ret < 0) | |
914 | ERROR("Failed to run \"lxc.hook.stop\" hook"); | |
915 | ||
916 | while (namespace_count--) | |
917 | free(namespaces[namespace_count]); | |
918 | ||
919 | handler->lsm_ops->cleanup(handler->lsm_ops, handler->conf, handler->lxcpath); | |
920 | ||
921 | if (cgroup_ops) { | |
922 | cgroup_ops->payload_destroy(cgroup_ops, handler); | |
923 | cgroup_ops->monitor_destroy(cgroup_ops, handler); | |
924 | } | |
925 | ||
926 | put_lxc_rootfs(&handler->conf->rootfs, true); | |
927 | ||
928 | if (handler->conf->reboot == REBOOT_NONE) { | |
929 | /* For all new state clients simply close the command socket. | |
930 | * This will inform all state clients that the container is | |
931 | * STOPPED and also prevents a race between a open()/close() on | |
932 | * the command socket causing a new process to get ECONNREFUSED | |
933 | * because we haven't yet closed the command socket. | |
934 | */ | |
935 | close_prot_errno_disarm(handler->conf->maincmd_fd); | |
936 | TRACE("Closed command socket"); | |
937 | ||
938 | /* This function will try to connect to the legacy lxc-monitord | |
939 | * state server and only exists for backwards compatibility. | |
940 | */ | |
941 | lxc_monitor_send_state(name, STOPPED, handler->lxcpath); | |
942 | ||
943 | /* The command socket is closed so no one can acces the command | |
944 | * socket anymore so there's no need to lock it. | |
945 | */ | |
946 | handler->state = STOPPED; | |
947 | TRACE("Set container state to \"STOPPED\""); | |
948 | } else { | |
949 | lxc_set_state(name, handler, STOPPED); | |
950 | TRACE("Set container state to \"STOPPED\""); | |
951 | } | |
952 | ||
953 | /* Avoid lingering namespace references. */ | |
954 | lxc_put_nsfds(handler); | |
955 | ||
956 | ret = run_lxc_hooks(name, "post-stop", handler->conf, NULL); | |
957 | if (ret < 0) { | |
958 | ERROR("Failed to run lxc.hook.post-stop for container \"%s\"", name); | |
959 | if (handler->conf->reboot > REBOOT_NONE) { | |
960 | WARN("Container will be stopped instead of rebooted"); | |
961 | handler->conf->reboot = REBOOT_NONE; | |
962 | ||
963 | ret = setenv("LXC_TARGET", "stop", 1); | |
964 | if (ret < 0) | |
965 | WARN("Failed to set environment variable: LXC_TARGET=stop"); | |
966 | } | |
967 | } | |
968 | ||
969 | /* Reset mask set by setup_signal_fd. */ | |
970 | ret = pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); | |
971 | if (ret < 0) | |
972 | SYSWARN("Failed to restore signal mask"); | |
973 | ||
974 | lxc_terminal_delete(&handler->conf->console); | |
975 | lxc_delete_tty(&handler->conf->ttys); | |
976 | close_prot_errno_disarm(handler->conf->devpts_fd); | |
977 | ||
978 | /* The command socket is now closed, no more state clients can register | |
979 | * themselves from now on. So free the list of state clients. | |
980 | */ | |
981 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { | |
982 | struct lxc_state_client *client = cur->elem; | |
983 | ||
984 | /* Keep state clients that want to be notified about reboots. */ | |
985 | if ((handler->conf->reboot > REBOOT_NONE) && | |
986 | (client->states[RUNNING] == 2)) | |
987 | continue; | |
988 | ||
989 | /* close state client socket */ | |
990 | lxc_list_del(cur); | |
991 | close(client->clientfd); | |
992 | free(cur->elem); | |
993 | free(cur); | |
994 | } | |
995 | ||
996 | if (handler->conf->ephemeral == 1 && handler->conf->reboot != REBOOT_REQ) | |
997 | lxc_destroy_container_on_signal(handler, name); | |
998 | ||
999 | lxc_put_handler(handler); | |
1000 | } | |
1001 | ||
1002 | void lxc_abort(struct lxc_handler *handler) | |
1003 | { | |
1004 | int ret = 0; | |
1005 | int status; | |
1006 | ||
1007 | lxc_set_state(handler->name, handler, ABORTING); | |
1008 | ||
1009 | if (handler->pidfd >= 0) { | |
1010 | ret = lxc_raw_pidfd_send_signal(handler->pidfd, SIGKILL, NULL, 0); | |
1011 | if (ret) | |
1012 | SYSWARN("Failed to send SIGKILL via pidfd %d for process %d", | |
1013 | handler->pidfd, handler->pid); | |
1014 | } | |
1015 | ||
1016 | if ((!ret || errno != ESRCH) && handler->pid > 0) | |
1017 | if (kill(handler->pid, SIGKILL)) | |
1018 | SYSWARN("Failed to send SIGKILL to %d", handler->pid); | |
1019 | ||
1020 | do { | |
1021 | ret = waitpid(-1, &status, 0); | |
1022 | } while (ret > 0); | |
1023 | } | |
1024 | ||
1025 | static int do_start(void *data) | |
1026 | { | |
1027 | struct lxc_handler *handler = data; | |
1028 | __lxc_unused __do_close int data_sock0 = handler->data_sock[0], | |
1029 | data_sock1 = handler->data_sock[1]; | |
1030 | __do_close int devnull_fd = -EBADF, status_fd = -EBADF; | |
1031 | int ret; | |
1032 | uid_t new_uid; | |
1033 | gid_t new_gid; | |
1034 | struct lxc_list *iterator; | |
1035 | uid_t nsuid = 0; | |
1036 | gid_t nsgid = 0; | |
1037 | ||
1038 | lxc_sync_fini_parent(handler); | |
1039 | ||
1040 | if (lxc_abstract_unix_recv_fds(data_sock1, &status_fd, 1, NULL, 0) < 0) { | |
1041 | ERROR("Failed to receive status file descriptor to child process"); | |
1042 | goto out_warn_father; | |
1043 | } | |
1044 | ||
1045 | /* This prctl must be before the synchro, so if the parent dies before | |
1046 | * we set the parent death signal, we will detect its death with the | |
1047 | * synchro right after, otherwise we have a window where the parent can | |
1048 | * exit before we set the pdeath signal leading to a unsupervized | |
1049 | * container. | |
1050 | */ | |
1051 | ret = lxc_set_death_signal(SIGKILL, handler->monitor_pid, status_fd); | |
1052 | if (ret < 0) { | |
1053 | SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL"); | |
1054 | goto out_warn_father; | |
1055 | } | |
1056 | ||
1057 | ret = lxc_ambient_caps_up(); | |
1058 | if (ret < 0) { | |
1059 | ERROR("Failed to raise ambient capabilities"); | |
1060 | goto out_warn_father; | |
1061 | } | |
1062 | ||
1063 | ret = pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); | |
1064 | if (ret < 0) { | |
1065 | SYSERROR("Failed to set signal mask"); | |
1066 | goto out_warn_father; | |
1067 | } | |
1068 | ||
1069 | if (!lxc_sync_wait_parent(handler, START_SYNC_STARTUP)) | |
1070 | goto out_warn_father; | |
1071 | ||
1072 | /* Unshare CLONE_NEWNET after CLONE_NEWUSER. See | |
1073 | * https://github.com/lxc/lxd/issues/1978. | |
1074 | */ | |
1075 | if (handler->ns_unshare_flags & CLONE_NEWNET) { | |
1076 | ret = unshare(CLONE_NEWNET); | |
1077 | if (ret < 0) { | |
1078 | SYSERROR("Failed to unshare CLONE_NEWNET"); | |
1079 | goto out_warn_father; | |
1080 | } | |
1081 | INFO("Unshared CLONE_NEWNET"); | |
1082 | } | |
1083 | ||
1084 | /* Tell the parent task it can begin to configure the container and wait | |
1085 | * for it to finish. | |
1086 | */ | |
1087 | if (!lxc_sync_barrier_parent(handler, START_SYNC_CONFIGURE)) | |
1088 | goto out_error; | |
1089 | ||
1090 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
1091 | ret = lxc_network_recv_from_parent(handler); | |
1092 | if (ret < 0) { | |
1093 | ERROR("Failed to receive veth names from parent"); | |
1094 | goto out_warn_father; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | /* If we are in a new user namespace, become root there to have | |
1099 | * privilege over our namespace. | |
1100 | */ | |
1101 | if (!lxc_list_empty(&handler->conf->id_map)) { | |
1102 | if (!handler->conf->root_nsuid_map) | |
1103 | nsuid = handler->conf->init_uid; | |
1104 | ||
1105 | if (!handler->conf->root_nsgid_map) | |
1106 | nsgid = handler->conf->init_gid; | |
1107 | ||
1108 | /* Drop groups only after we switched to a valid gid in the new | |
1109 | * user namespace. | |
1110 | */ | |
1111 | if (!lxc_drop_groups() && | |
1112 | (handler->am_root || errno != EPERM)) | |
1113 | goto out_warn_father; | |
1114 | ||
1115 | if (!lxc_switch_uid_gid(nsuid, nsgid)) | |
1116 | goto out_warn_father; | |
1117 | ||
1118 | ret = prctl(PR_SET_DUMPABLE, prctl_arg(1), prctl_arg(0), | |
1119 | prctl_arg(0), prctl_arg(0)); | |
1120 | if (ret < 0) | |
1121 | goto out_warn_father; | |
1122 | ||
1123 | /* set{g,u}id() clears deathsignal */ | |
1124 | ret = lxc_set_death_signal(SIGKILL, handler->monitor_pid, status_fd); | |
1125 | if (ret < 0) { | |
1126 | SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL"); | |
1127 | goto out_warn_father; | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | ret = access(handler->lxcpath, X_OK); | |
1132 | if (ret != 0) { | |
1133 | print_top_failing_dir(handler->lxcpath); | |
1134 | goto out_warn_father; | |
1135 | } | |
1136 | ||
1137 | /* In order to checkpoint restore, we need to have everything in the | |
1138 | * same mount namespace. However, some containers may not have a | |
1139 | * reasonable /dev (in particular, they may not have /dev/null), so we | |
1140 | * can't set init's std fds to /dev/null by opening it from inside the | |
1141 | * container. | |
1142 | * | |
1143 | * If that's the case, fall back to using the host's /dev/null. This | |
1144 | * means that migration won't work, but at least we won't spew output | |
1145 | * where it isn't wanted. | |
1146 | */ | |
1147 | if (handler->daemonize && !handler->conf->autodev) { | |
1148 | char path[PATH_MAX]; | |
1149 | ||
1150 | ret = snprintf(path, sizeof(path), "%s/dev/null", | |
1151 | handler->conf->rootfs.mount); | |
1152 | if (ret < 0 || ret >= sizeof(path)) | |
1153 | goto out_warn_father; | |
1154 | ||
1155 | ret = access(path, F_OK); | |
1156 | if (ret != 0) { | |
1157 | devnull_fd = open_devnull(); | |
1158 | ||
1159 | if (devnull_fd < 0) | |
1160 | goto out_warn_father; | |
1161 | WARN("Using /dev/null from the host for container init's standard file descriptors. Migration will not work"); | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | /* Ask father to setup cgroups and wait for him to finish. */ | |
1166 | if (!lxc_sync_barrier_parent(handler, START_SYNC_CGROUP)) | |
1167 | goto out_error; | |
1168 | ||
1169 | /* Unshare cgroup namespace after we have setup our cgroups. If we do it | |
1170 | * earlier we end up with a wrong view of /proc/self/cgroup. For | |
1171 | * example, assume we unshare(CLONE_NEWCGROUP) first, and then create | |
1172 | * the cgroup for the container, say /sys/fs/cgroup/cpuset/lxc/c, then | |
1173 | * /proc/self/cgroup would show us: | |
1174 | * | |
1175 | * 8:cpuset:/lxc/c | |
1176 | * | |
1177 | * whereas it should actually show | |
1178 | * | |
1179 | * 8:cpuset:/ | |
1180 | */ | |
1181 | if (handler->ns_unshare_flags & CLONE_NEWCGROUP) { | |
1182 | ret = unshare(CLONE_NEWCGROUP); | |
1183 | if (ret < 0) { | |
1184 | if (errno != EINVAL) { | |
1185 | SYSERROR("Failed to unshare CLONE_NEWCGROUP"); | |
1186 | goto out_warn_father; | |
1187 | } | |
1188 | ||
1189 | handler->ns_clone_flags &= ~CLONE_NEWCGROUP; | |
1190 | SYSINFO("Kernel does not support CLONE_NEWCGROUP"); | |
1191 | } else { | |
1192 | INFO("Unshared CLONE_NEWCGROUP"); | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | if (handler->ns_unshare_flags & CLONE_NEWTIME) { | |
1197 | ret = unshare(CLONE_NEWTIME); | |
1198 | if (ret < 0) { | |
1199 | if (errno != EINVAL) { | |
1200 | SYSERROR("Failed to unshare CLONE_NEWTIME"); | |
1201 | goto out_warn_father; | |
1202 | } | |
1203 | ||
1204 | handler->ns_clone_flags &= ~CLONE_NEWTIME; | |
1205 | SYSINFO("Kernel does not support CLONE_NEWTIME"); | |
1206 | } else { | |
1207 | __do_close int timens_fd = -EBADF; | |
1208 | ||
1209 | INFO("Unshared CLONE_NEWTIME"); | |
1210 | ||
1211 | if (handler->conf->timens.s_boot) | |
1212 | ret = timens_offset_write(CLOCK_BOOTTIME, handler->conf->timens.s_boot, 0); | |
1213 | else if (handler->conf->timens.ns_boot) | |
1214 | ret = timens_offset_write(CLOCK_BOOTTIME, 0, handler->conf->timens.ns_boot); | |
1215 | if (ret) { | |
1216 | SYSERROR("Failed to write CLONE_BOOTTIME offset"); | |
1217 | goto out_warn_father; | |
1218 | } | |
1219 | TRACE("Wrote CLOCK_BOOTTIME offset"); | |
1220 | ||
1221 | if (handler->conf->timens.s_monotonic) | |
1222 | ret = timens_offset_write(CLOCK_MONOTONIC, handler->conf->timens.s_monotonic, 0); | |
1223 | else if (handler->conf->timens.ns_monotonic) | |
1224 | ret = timens_offset_write(CLOCK_MONOTONIC, 0, handler->conf->timens.ns_monotonic); | |
1225 | if (ret) { | |
1226 | SYSERROR("Failed to write CLONE_MONOTONIC offset"); | |
1227 | goto out_warn_father; | |
1228 | } | |
1229 | TRACE("Wrote CLOCK_MONOTONIC offset"); | |
1230 | ||
1231 | timens_fd = open("/proc/self/ns/time_for_children", O_RDONLY | O_CLOEXEC); | |
1232 | if (timens_fd < 0) { | |
1233 | SYSERROR("Failed to open \"/proc/self/ns/time_for_children\""); | |
1234 | goto out_warn_father; | |
1235 | } | |
1236 | ||
1237 | ret = setns(timens_fd, CLONE_NEWTIME); | |
1238 | if (ret) { | |
1239 | SYSERROR("Failed to setns(%d(\"/proc/self/ns/time_for_children\"))", timens_fd); | |
1240 | goto out_warn_father; | |
1241 | } | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | /* Add the requested environment variables to the current environment to | |
1246 | * allow them to be used by the various hooks, such as the start hook | |
1247 | * below. | |
1248 | */ | |
1249 | lxc_list_for_each(iterator, &handler->conf->environment) { | |
1250 | ret = putenv((char *)iterator->elem); | |
1251 | if (ret < 0) { | |
1252 | SYSERROR("Failed to set environment variable: %s", | |
1253 | (char *)iterator->elem); | |
1254 | goto out_warn_father; | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | /* Setup the container, ip, names, utsname, ... */ | |
1259 | ret = lxc_setup(handler); | |
1260 | if (ret < 0) { | |
1261 | ERROR("Failed to setup container \"%s\"", handler->name); | |
1262 | goto out_warn_father; | |
1263 | } | |
1264 | ||
1265 | /* Set the label to change to when we exec(2) the container's init. */ | |
1266 | ret = handler->lsm_ops->process_label_set(handler->lsm_ops, NULL, handler->conf, true); | |
1267 | if (ret < 0) | |
1268 | goto out_warn_father; | |
1269 | ||
1270 | /* Set PR_SET_NO_NEW_PRIVS after we changed the lsm label. If we do it | |
1271 | * before we aren't allowed anymore. | |
1272 | */ | |
1273 | if (handler->conf->no_new_privs) { | |
1274 | ret = prctl(PR_SET_NO_NEW_PRIVS, prctl_arg(1), prctl_arg(0), | |
1275 | prctl_arg(0), prctl_arg(0)); | |
1276 | if (ret < 0) { | |
1277 | SYSERROR("Could not set PR_SET_NO_NEW_PRIVS to block execve() gainable privileges"); | |
1278 | goto out_warn_father; | |
1279 | } | |
1280 | DEBUG("Set PR_SET_NO_NEW_PRIVS to block execve() gainable privileges"); | |
1281 | } | |
1282 | ||
1283 | /* Some init's such as busybox will set sane tty settings on stdin, | |
1284 | * stdout, stderr which it thinks is the console. We already set them | |
1285 | * the way we wanted on the real terminal, and we want init to do its | |
1286 | * setup on its console ie. the pty allocated in lxc_terminal_setup() so | |
1287 | * make sure that that pty is stdin,stdout,stderr. | |
1288 | */ | |
1289 | if (handler->conf->console.pty >= 0) { | |
1290 | if (handler->daemonize || !handler->conf->is_execute) | |
1291 | ret = set_stdfds(handler->conf->console.pty); | |
1292 | else | |
1293 | ret = lxc_terminal_set_stdfds(handler->conf->console.pty); | |
1294 | if (ret < 0) { | |
1295 | ERROR("Failed to redirect std{in,out,err} to pty file descriptor %d", | |
1296 | handler->conf->console.pty); | |
1297 | goto out_warn_father; | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | /* If we mounted a temporary proc, then unmount it now. */ | |
1302 | tmp_proc_unmount(handler->conf); | |
1303 | ||
1304 | ret = lxc_seccomp_load(handler->conf); | |
1305 | if (ret < 0) | |
1306 | goto out_warn_father; | |
1307 | ||
1308 | ret = lxc_seccomp_send_notifier_fd(&handler->conf->seccomp, data_sock0); | |
1309 | if (ret < 0) { | |
1310 | SYSERROR("Failed to send seccomp notify fd to parent"); | |
1311 | goto out_warn_father; | |
1312 | } | |
1313 | ||
1314 | ret = run_lxc_hooks(handler->name, "start", handler->conf, NULL); | |
1315 | if (ret < 0) { | |
1316 | ERROR("Failed to run lxc.hook.start for container \"%s\"", | |
1317 | handler->name); | |
1318 | goto out_warn_father; | |
1319 | } | |
1320 | ||
1321 | close_prot_errno_disarm(handler->sigfd); | |
1322 | ||
1323 | if (handler->conf->console.pty < 0 && handler->daemonize) { | |
1324 | if (devnull_fd < 0) { | |
1325 | devnull_fd = open_devnull(); | |
1326 | if (devnull_fd < 0) | |
1327 | goto out_warn_father; | |
1328 | } | |
1329 | ||
1330 | ret = set_stdfds(devnull_fd); | |
1331 | if (ret < 0) { | |
1332 | ERROR("Failed to redirect std{in,out,err} to \"/dev/null\""); | |
1333 | goto out_warn_father; | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | close_prot_errno_disarm(devnull_fd); | |
1338 | ||
1339 | setsid(); | |
1340 | ||
1341 | if (handler->conf->init_cwd) { | |
1342 | ret = chdir(handler->conf->init_cwd); | |
1343 | if (ret < 0) { | |
1344 | SYSERROR("Could not change directory to \"%s\"", | |
1345 | handler->conf->init_cwd); | |
1346 | goto out_warn_father; | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | if (!lxc_sync_barrier_parent(handler, START_SYNC_CGROUP_LIMITS)) | |
1351 | goto out_warn_father; | |
1352 | ||
1353 | /* Reset the environment variables the user requested in a clear | |
1354 | * environment. | |
1355 | */ | |
1356 | ret = clearenv(); | |
1357 | /* Don't error out though. */ | |
1358 | if (ret < 0) | |
1359 | SYSERROR("Failed to clear environment."); | |
1360 | ||
1361 | lxc_list_for_each(iterator, &handler->conf->environment) { | |
1362 | ret = putenv((char *)iterator->elem); | |
1363 | if (ret < 0) { | |
1364 | SYSERROR("Failed to set environment variable: %s", | |
1365 | (char *)iterator->elem); | |
1366 | goto out_warn_father; | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | ret = putenv("container=lxc"); | |
1371 | if (ret < 0) { | |
1372 | SYSERROR("Failed to set environment variable: container=lxc"); | |
1373 | goto out_warn_father; | |
1374 | } | |
1375 | ||
1376 | if (handler->conf->ttys.tty_names) { | |
1377 | ret = putenv(handler->conf->ttys.tty_names); | |
1378 | if (ret < 0) { | |
1379 | SYSERROR("Failed to set environment variable for container ptys"); | |
1380 | goto out_warn_father; | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | /* The container has been setup. We can now switch to an unprivileged | |
1385 | * uid/gid. | |
1386 | */ | |
1387 | new_uid = handler->conf->init_uid; | |
1388 | new_gid = handler->conf->init_gid; | |
1389 | ||
1390 | /* Avoid unnecessary syscalls. */ | |
1391 | if (new_uid == nsuid) | |
1392 | new_uid = LXC_INVALID_UID; | |
1393 | ||
1394 | if (new_gid == nsgid) | |
1395 | new_gid = LXC_INVALID_GID; | |
1396 | ||
1397 | /* Make sure that the processes STDIO is correctly owned by the user that we are switching to */ | |
1398 | ret = fix_stdio_permissions(new_uid); | |
1399 | if (ret) | |
1400 | WARN("Failed to ajust stdio permissions"); | |
1401 | ||
1402 | /* If we are in a new user namespace we already dropped all groups when | |
1403 | * we switched to root in the new user namespace further above. Only | |
1404 | * drop groups if we can, so ensure that we have necessary privilege. | |
1405 | */ | |
1406 | if (lxc_list_empty(&handler->conf->id_map)) { | |
1407 | #if HAVE_LIBCAP | |
1408 | if (lxc_proc_cap_is_set(CAP_SETGID, CAP_EFFECTIVE)) | |
1409 | #endif | |
1410 | { | |
1411 | if (handler->conf->init_groups.size > 0) { | |
1412 | if (!lxc_setgroups(handler->conf->init_groups.list, | |
1413 | handler->conf->init_groups.size)) | |
1414 | goto out_warn_father; | |
1415 | } else { | |
1416 | if (!lxc_drop_groups()) | |
1417 | goto out_warn_father; | |
1418 | } | |
1419 | } | |
1420 | } | |
1421 | ||
1422 | if (!lxc_switch_uid_gid(new_uid, new_gid)) | |
1423 | goto out_warn_father; | |
1424 | ||
1425 | ret = lxc_ambient_caps_down(); | |
1426 | if (ret < 0) { | |
1427 | ERROR("Failed to clear ambient capabilities"); | |
1428 | goto out_warn_father; | |
1429 | } | |
1430 | ||
1431 | if (handler->conf->monitor_signal_pdeath != SIGKILL) { | |
1432 | ret = lxc_set_death_signal(handler->conf->monitor_signal_pdeath, | |
1433 | handler->monitor_pid, status_fd); | |
1434 | if (ret < 0) { | |
1435 | SYSERROR("Failed to set PR_SET_PDEATHSIG to %d", | |
1436 | handler->conf->monitor_signal_pdeath); | |
1437 | goto out_warn_father; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * After this call, we are in error because this ops should not return | |
1443 | * as it execs. | |
1444 | */ | |
1445 | handler->ops->start(handler, handler->data); | |
1446 | ||
1447 | out_warn_father: | |
1448 | /* | |
1449 | * We want the parent to know something went wrong, so we return a | |
1450 | * special error code. | |
1451 | */ | |
1452 | lxc_sync_wake_parent(handler, SYNC_ERROR); | |
1453 | ||
1454 | out_error: | |
1455 | return -1; | |
1456 | } | |
1457 | ||
1458 | static int lxc_recv_ttys_from_child(struct lxc_handler *handler) | |
1459 | { | |
1460 | int i; | |
1461 | struct lxc_terminal_info *tty; | |
1462 | int ret = -1; | |
1463 | int sock = handler->data_sock[1]; | |
1464 | struct lxc_conf *conf = handler->conf; | |
1465 | struct lxc_tty_info *ttys = &conf->ttys; | |
1466 | ||
1467 | if (!conf->ttys.max) | |
1468 | return 0; | |
1469 | ||
1470 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); | |
1471 | if (!ttys->tty) | |
1472 | return -1; | |
1473 | ||
1474 | for (i = 0; i < conf->ttys.max; i++) { | |
1475 | int ttyfds[2]; | |
1476 | ||
1477 | ret = lxc_abstract_unix_recv_fds(sock, ttyfds, 2, NULL, 0); | |
1478 | if (ret < 0) | |
1479 | break; | |
1480 | ||
1481 | tty = &ttys->tty[i]; | |
1482 | tty->busy = -1; | |
1483 | tty->ptx = ttyfds[0]; | |
1484 | tty->pty = ttyfds[1]; | |
1485 | TRACE("Received pty with ptx fd %d and pty fd %d from child", tty->ptx, tty->pty); | |
1486 | } | |
1487 | ||
1488 | if (ret < 0) | |
1489 | SYSERROR("Failed to receive %zu ttys from child", ttys->max); | |
1490 | else | |
1491 | TRACE("Received %zu ttys from child", ttys->max); | |
1492 | ||
1493 | return ret; | |
1494 | } | |
1495 | ||
1496 | int resolve_clone_flags(struct lxc_handler *handler) | |
1497 | { | |
1498 | int i; | |
1499 | struct lxc_conf *conf = handler->conf; | |
1500 | bool wants_timens = conf->timens.s_boot || conf->timens.ns_boot || | |
1501 | conf->timens.s_monotonic || conf->timens.ns_monotonic; | |
1502 | ||
1503 | for (i = 0; i < LXC_NS_MAX; i++) { | |
1504 | if (conf->ns_keep) { | |
1505 | if (!(conf->ns_keep & ns_info[i].clone_flag)) | |
1506 | handler->ns_clone_flags |= ns_info[i].clone_flag; | |
1507 | } else if (conf->ns_clone) { | |
1508 | if ((conf->ns_clone & ns_info[i].clone_flag)) | |
1509 | handler->ns_clone_flags |= ns_info[i].clone_flag; | |
1510 | } else { | |
1511 | if (i == LXC_NS_USER && lxc_list_empty(&handler->conf->id_map)) | |
1512 | continue; | |
1513 | ||
1514 | if (i == LXC_NS_NET && lxc_requests_empty_network(handler)) | |
1515 | continue; | |
1516 | ||
1517 | if (i == LXC_NS_CGROUP && !cgns_supported()) | |
1518 | continue; | |
1519 | ||
1520 | if (i == LXC_NS_TIME && !wants_timens) | |
1521 | continue; | |
1522 | ||
1523 | handler->ns_clone_flags |= ns_info[i].clone_flag; | |
1524 | } | |
1525 | ||
1526 | if (!conf->ns_share[i]) | |
1527 | continue; | |
1528 | ||
1529 | handler->ns_clone_flags &= ~ns_info[i].clone_flag; | |
1530 | TRACE("Sharing %s namespace", ns_info[i].proc_name); | |
1531 | } | |
1532 | ||
1533 | if (wants_timens && (conf->ns_keep & ns_info[LXC_NS_TIME].clone_flag)) | |
1534 | return log_trace_errno(-1, EINVAL, "Requested to keep time namespace while also specifying offsets"); | |
1535 | ||
1536 | /* Deal with namespaces that are unshared. */ | |
1537 | if (handler->ns_clone_flags & CLONE_NEWTIME) | |
1538 | handler->ns_unshare_flags |= CLONE_NEWTIME; | |
1539 | ||
1540 | if (!pure_unified_layout(handler->cgroup_ops) && handler->ns_clone_flags & CLONE_NEWCGROUP) | |
1541 | handler->ns_unshare_flags |= CLONE_NEWCGROUP; | |
1542 | ||
1543 | if ((handler->ns_clone_flags & (CLONE_NEWNET | CLONE_NEWUSER)) == | |
1544 | (CLONE_NEWNET | CLONE_NEWUSER)) | |
1545 | handler->ns_unshare_flags |= CLONE_NEWNET; | |
1546 | ||
1547 | /* Deal with namespaces that are spawned. */ | |
1548 | handler->ns_on_clone_flags = handler->ns_clone_flags & ~handler->ns_unshare_flags; | |
1549 | ||
1550 | handler->clone_flags = handler->ns_on_clone_flags | CLONE_PIDFD; | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | /* Note that this function is used with clone(CLONE_VM). Some glibc versions | |
1556 | * used to reset the pid/tid to -1 when CLONE_VM was used without CLONE_THREAD. | |
1557 | * But since the memory between parent and child is shared on CLONE_VM this | |
1558 | * would invalidate the getpid() cache that glibc used to maintain and so | |
1559 | * getpid() in the child would return the parent's pid. This is all fixed in | |
1560 | * newer glibc versions where the getpid() cache is removed and the pid/tid is | |
1561 | * not reset anymore. | |
1562 | * However, if for whatever reason you - dear committer - somehow need to get the | |
1563 | * pid of the dummy intermediate process for do_share_ns() you need to call | |
1564 | * lxc_raw_getpid(). The next lxc_raw_clone() call does not employ CLONE_VM and | |
1565 | * will be fine. | |
1566 | */ | |
1567 | static inline int do_share_ns(void *arg) | |
1568 | { | |
1569 | int i, flags, ret; | |
1570 | struct lxc_handler *handler = arg; | |
1571 | ||
1572 | for (i = 0; i < LXC_NS_MAX; i++) { | |
1573 | if (handler->nsfd[i] < 0) | |
1574 | continue; | |
1575 | ||
1576 | ret = setns(handler->nsfd[i], 0); | |
1577 | if (ret < 0) { | |
1578 | /* | |
1579 | * Note that joining a user and/or mount namespace | |
1580 | * requires the process is not multithreaded otherwise | |
1581 | * setns() will fail here. | |
1582 | */ | |
1583 | SYSERROR("Failed to inherit %s namespace", | |
1584 | ns_info[i].proc_name); | |
1585 | return -1; | |
1586 | } | |
1587 | ||
1588 | DEBUG("Inherited %s namespace", ns_info[i].proc_name); | |
1589 | } | |
1590 | ||
1591 | flags = handler->ns_on_clone_flags; | |
1592 | flags |= CLONE_PARENT; | |
1593 | handler->pid = lxc_raw_clone_cb(do_start, handler, CLONE_PIDFD | flags, | |
1594 | &handler->pidfd); | |
1595 | if (handler->pid < 0) | |
1596 | return -1; | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | /* lxc_spawn() performs crucial setup tasks and clone()s the new process which | |
1602 | * exec()s the requested container binary. | |
1603 | * Note that lxc_spawn() runs in the parent namespaces. Any operations performed | |
1604 | * right here should be double checked if they'd pose a security risk. (For | |
1605 | * example, any {u}mount() operations performed here will be reflected on the | |
1606 | * host!) | |
1607 | */ | |
1608 | static int lxc_spawn(struct lxc_handler *handler) | |
1609 | { | |
1610 | __do_close int data_sock0 = -EBADF, data_sock1 = -EBADF; | |
1611 | int i, ret; | |
1612 | char pidstr[20]; | |
1613 | bool wants_to_map_ids; | |
1614 | struct lxc_list *id_map; | |
1615 | const char *name = handler->name; | |
1616 | const char *lxcpath = handler->lxcpath; | |
1617 | bool share_ns = false; | |
1618 | struct lxc_conf *conf = handler->conf; | |
1619 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; | |
1620 | ||
1621 | id_map = &conf->id_map; | |
1622 | wants_to_map_ids = !lxc_list_empty(id_map); | |
1623 | ||
1624 | for (i = 0; i < LXC_NS_MAX; i++) { | |
1625 | if (!conf->ns_share[i]) | |
1626 | continue; | |
1627 | ||
1628 | handler->nsfd[i] = lxc_inherit_namespace(conf->ns_share[i], lxcpath, ns_info[i].proc_name); | |
1629 | if (handler->nsfd[i] < 0) | |
1630 | return -1; | |
1631 | ||
1632 | share_ns = true; | |
1633 | } | |
1634 | ||
1635 | if (!lxc_sync_init(handler)) | |
1636 | return -1; | |
1637 | ||
1638 | ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, | |
1639 | handler->data_sock); | |
1640 | if (ret < 0) | |
1641 | goto out_sync_fini; | |
1642 | data_sock0 = handler->data_sock[0]; | |
1643 | data_sock1 = handler->data_sock[1]; | |
1644 | ||
1645 | ret = resolve_clone_flags(handler); | |
1646 | if (ret < 0) | |
1647 | goto out_sync_fini; | |
1648 | ||
1649 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
1650 | ret = lxc_find_gateway_addresses(handler); | |
1651 | if (ret) { | |
1652 | ERROR("Failed to find gateway addresses"); | |
1653 | goto out_sync_fini; | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | if (!cgroup_ops->payload_create(cgroup_ops, handler)) { | |
1658 | ERROR("Failed creating cgroups"); | |
1659 | goto out_delete_net; | |
1660 | } | |
1661 | ||
1662 | /* If the rootfs is not a blockdev, prevent the container from marking | |
1663 | * it readonly. | |
1664 | * If the container is unprivileged then skip rootfs pinning. | |
1665 | */ | |
1666 | ret = lxc_rootfs_prepare(&conf->rootfs, wants_to_map_ids); | |
1667 | if (ret) { | |
1668 | ERROR("Failed to handle rootfs pinning for container \"%s\"", handler->name); | |
1669 | goto out_delete_net; | |
1670 | } | |
1671 | ||
1672 | /* Create a process in a new set of namespaces. */ | |
1673 | if (share_ns) { | |
1674 | pid_t attacher_pid; | |
1675 | ||
1676 | attacher_pid = lxc_clone(do_share_ns, handler, | |
1677 | CLONE_VFORK | CLONE_VM | CLONE_FILES, NULL); | |
1678 | if (attacher_pid < 0) { | |
1679 | SYSERROR(LXC_CLONE_ERROR); | |
1680 | goto out_delete_net; | |
1681 | } | |
1682 | ||
1683 | ret = wait_for_pid(attacher_pid); | |
1684 | if (ret < 0) { | |
1685 | SYSERROR("Intermediate process failed"); | |
1686 | goto out_delete_net; | |
1687 | } | |
1688 | ||
1689 | if (handler->pid < 0) { | |
1690 | SYSERROR(LXC_CLONE_ERROR); | |
1691 | goto out_delete_net; | |
1692 | } | |
1693 | } else { | |
1694 | int cgroup_fd = -EBADF; | |
1695 | ||
1696 | struct lxc_clone_args clone_args = { | |
1697 | .flags = handler->clone_flags, | |
1698 | .pidfd = ptr_to_u64(&handler->pidfd), | |
1699 | .exit_signal = SIGCHLD, | |
1700 | }; | |
1701 | ||
1702 | if (handler->ns_clone_flags & CLONE_NEWCGROUP) { | |
1703 | cgroup_fd = cgroup_unified_fd(cgroup_ops); | |
1704 | if (cgroup_fd >= 0) { | |
1705 | handler->clone_flags |= CLONE_INTO_CGROUP; | |
1706 | clone_args.flags |= CLONE_INTO_CGROUP; | |
1707 | clone_args.cgroup = cgroup_fd; | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | /* Try to spawn directly into target cgroup. */ | |
1712 | handler->pid = lxc_clone3(&clone_args, CLONE_ARGS_SIZE_VER2); | |
1713 | if (handler->pid < 0) { | |
1714 | SYSTRACE("Failed to spawn container directly into target cgroup"); | |
1715 | ||
1716 | /* Kernel might simply be too old for CLONE_INTO_CGROUP. */ | |
1717 | handler->clone_flags &= ~(CLONE_INTO_CGROUP | CLONE_NEWCGROUP); | |
1718 | handler->ns_on_clone_flags &= ~CLONE_NEWCGROUP; | |
1719 | handler->ns_unshare_flags |= CLONE_NEWCGROUP; | |
1720 | ||
1721 | clone_args.flags = handler->clone_flags; | |
1722 | ||
1723 | handler->pid = lxc_clone3(&clone_args, CLONE_ARGS_SIZE_VER0); | |
1724 | } else if (cgroup_fd >= 0) { | |
1725 | TRACE("Spawned container directly into target cgroup via cgroup2 fd %d", cgroup_fd); | |
1726 | } | |
1727 | ||
1728 | /* Kernel might be too old for clone3(). */ | |
1729 | if (handler->pid < 0) { | |
1730 | SYSTRACE("Failed to spawn container via clone3()"); | |
1731 | handler->pid = lxc_raw_legacy_clone(handler->clone_flags, &handler->pidfd); | |
1732 | } | |
1733 | ||
1734 | if (handler->pid < 0) { | |
1735 | SYSERROR(LXC_CLONE_ERROR); | |
1736 | goto out_delete_net; | |
1737 | } | |
1738 | ||
1739 | if (handler->pid == 0) { | |
1740 | (void)do_start(handler); | |
1741 | _exit(EXIT_FAILURE); | |
1742 | } | |
1743 | } | |
1744 | if (handler->pidfd < 0) | |
1745 | handler->clone_flags &= ~CLONE_PIDFD; | |
1746 | TRACE("Cloned child process %d", handler->pid); | |
1747 | ||
1748 | /* Verify that we can actually make use of pidfds. */ | |
1749 | if (!lxc_can_use_pidfd(handler->pidfd)) | |
1750 | close_prot_errno_disarm(handler->pidfd); | |
1751 | ||
1752 | ret = snprintf(pidstr, 20, "%d", handler->pid); | |
1753 | if (ret < 0 || ret >= 20) | |
1754 | goto out_delete_net; | |
1755 | ||
1756 | ret = setenv("LXC_PID", pidstr, 1); | |
1757 | if (ret < 0) | |
1758 | SYSERROR("Failed to set environment variable: LXC_PID=%s", pidstr); | |
1759 | ||
1760 | for (i = 0; i < LXC_NS_MAX; i++) | |
1761 | if (handler->ns_on_clone_flags & ns_info[i].clone_flag) | |
1762 | INFO("Cloned %s", ns_info[i].flag_name); | |
1763 | ||
1764 | if (!lxc_try_preserve_namespaces(handler, handler->ns_on_clone_flags, handler->pid)) { | |
1765 | ERROR("Failed to preserve cloned namespaces for lxc.hook.stop"); | |
1766 | goto out_delete_net; | |
1767 | } | |
1768 | ||
1769 | lxc_sync_fini_child(handler); | |
1770 | ||
1771 | if (lxc_abstract_unix_send_fds(handler->data_sock[0], &handler->monitor_status_fd, 1, NULL, 0) < 0) { | |
1772 | ERROR("Failed to send status file descriptor to child process"); | |
1773 | goto out_delete_net; | |
1774 | } | |
1775 | close_prot_errno_disarm(handler->monitor_status_fd); | |
1776 | ||
1777 | /* Map the container uids. The container became an invalid userid the | |
1778 | * moment it was cloned with CLONE_NEWUSER. This call doesn't change | |
1779 | * anything immediately, but allows the container to setuid(0) (0 being | |
1780 | * mapped to something else on the host.) later to become a valid uid | |
1781 | * again. | |
1782 | */ | |
1783 | if (wants_to_map_ids) { | |
1784 | if (!handler->conf->ns_share[LXC_NS_USER] && | |
1785 | (handler->conf->ns_keep & CLONE_NEWUSER) == 0) { | |
1786 | ret = lxc_map_ids(id_map, handler->pid); | |
1787 | if (ret < 0) { | |
1788 | ERROR("Failed to set up id mapping."); | |
1789 | goto out_delete_net; | |
1790 | } | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | if (!lxc_sync_wake_child(handler, START_SYNC_STARTUP)) | |
1795 | goto out_delete_net; | |
1796 | ||
1797 | if (!lxc_sync_wait_child(handler, START_SYNC_CONFIGURE)) | |
1798 | goto out_delete_net; | |
1799 | ||
1800 | if (!cgroup_ops->setup_limits_legacy(cgroup_ops, handler->conf, false)) { | |
1801 | ERROR("Failed to setup cgroup limits for container \"%s\"", name); | |
1802 | goto out_delete_net; | |
1803 | } | |
1804 | ||
1805 | if (!cgroup_ops->payload_enter(cgroup_ops, handler)) { | |
1806 | ERROR("Failed to enter cgroups"); | |
1807 | goto out_delete_net; | |
1808 | } | |
1809 | ||
1810 | if (!cgroup_ops->payload_delegate_controllers(cgroup_ops)) { | |
1811 | ERROR("Failed to delegate controllers to payload cgroup"); | |
1812 | goto out_delete_net; | |
1813 | } | |
1814 | ||
1815 | if (!cgroup_ops->setup_limits(cgroup_ops, handler)) { | |
1816 | ERROR("Failed to setup cgroup limits for container \"%s\"", name); | |
1817 | goto out_delete_net; | |
1818 | } | |
1819 | ||
1820 | if (!cgroup_ops->chown(cgroup_ops, handler->conf)) | |
1821 | goto out_delete_net; | |
1822 | ||
1823 | /* If not done yet, we're now ready to preserve the network namespace */ | |
1824 | if (handler->nsfd[LXC_NS_NET] < 0) { | |
1825 | ret = lxc_try_preserve_ns(handler->pid, "net"); | |
1826 | if (ret < 0) { | |
1827 | if (ret != -EOPNOTSUPP) { | |
1828 | SYSERROR("Failed to preserve net namespace"); | |
1829 | goto out_delete_net; | |
1830 | } | |
1831 | } else { | |
1832 | handler->nsfd[LXC_NS_NET] = ret; | |
1833 | DEBUG("Preserved net namespace via fd %d", ret); | |
1834 | } | |
1835 | } | |
1836 | ret = lxc_netns_set_nsid(handler->nsfd[LXC_NS_NET]); | |
1837 | if (ret < 0) | |
1838 | SYSWARN("Failed to allocate new network namespace id"); | |
1839 | else | |
1840 | TRACE("Allocated new network namespace id"); | |
1841 | ||
1842 | /* Create the network configuration. */ | |
1843 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
1844 | ret = lxc_create_network(handler); | |
1845 | if (ret < 0) { | |
1846 | ERROR("Failed to create the network"); | |
1847 | goto out_delete_net; | |
1848 | } | |
1849 | ||
1850 | ret = lxc_network_send_to_child(handler); | |
1851 | if (ret < 0) { | |
1852 | ERROR("Failed to send veth names to child"); | |
1853 | goto out_delete_net; | |
1854 | } | |
1855 | } | |
1856 | ||
1857 | if (!lxc_list_empty(&conf->procs)) { | |
1858 | ret = setup_proc_filesystem(&conf->procs, handler->pid); | |
1859 | if (ret < 0) | |
1860 | goto out_delete_net; | |
1861 | } | |
1862 | ||
1863 | /* Tell the child to continue its initialization. We'll get | |
1864 | * START_SYNC_CGROUP when it is ready for us to setup cgroups. | |
1865 | */ | |
1866 | if (!lxc_sync_barrier_child(handler, START_SYNC_POST_CONFIGURE)) | |
1867 | goto out_delete_net; | |
1868 | ||
1869 | if (!lxc_list_empty(&conf->limits)) { | |
1870 | ret = setup_resource_limits(&conf->limits, handler->pid); | |
1871 | if (ret < 0) { | |
1872 | ERROR("Failed to setup resource limits"); | |
1873 | goto out_delete_net; | |
1874 | } | |
1875 | } | |
1876 | ||
1877 | if (!lxc_sync_barrier_child(handler, START_SYNC_CGROUP_UNSHARE)) | |
1878 | goto out_delete_net; | |
1879 | ||
1880 | /* | |
1881 | * with isolation the limiting devices cgroup was already setup, so | |
1882 | * only setup devices here if we have no namespace directory | |
1883 | */ | |
1884 | if (!handler->conf->cgroup_meta.namespace_dir && | |
1885 | !cgroup_ops->setup_limits_legacy(cgroup_ops, handler->conf, true)) { | |
1886 | ERROR("Failed to setup legacy device cgroup controller limits"); | |
1887 | goto out_delete_net; | |
1888 | } | |
1889 | TRACE("Set up legacy device cgroup controller limits"); | |
1890 | ||
1891 | if (!cgroup_ops->devices_activate(cgroup_ops, handler)) { | |
1892 | ERROR("Failed to setup cgroup2 device controller limits"); | |
1893 | goto out_delete_net; | |
1894 | } | |
1895 | TRACE("Set up cgroup2 device controller limits"); | |
1896 | ||
1897 | if (handler->ns_unshare_flags & CLONE_NEWCGROUP) { | |
1898 | /* Now we're ready to preserve the cgroup namespace */ | |
1899 | ret = lxc_try_preserve_ns(handler->pid, "cgroup"); | |
1900 | if (ret < 0) { | |
1901 | if (ret != -EOPNOTSUPP) { | |
1902 | SYSERROR("Failed to preserve cgroup namespace"); | |
1903 | goto out_delete_net; | |
1904 | } | |
1905 | } else { | |
1906 | handler->nsfd[LXC_NS_CGROUP] = ret; | |
1907 | DEBUG("Preserved cgroup namespace via fd %d", ret); | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | cgroup_ops->payload_finalize(cgroup_ops); | |
1912 | TRACE("Finished setting up cgroups"); | |
1913 | ||
1914 | if (handler->ns_unshare_flags & CLONE_NEWTIME) { | |
1915 | /* Now we're ready to preserve the cgroup namespace */ | |
1916 | ret = lxc_try_preserve_ns(handler->pid, "time"); | |
1917 | if (ret < 0) { | |
1918 | if (ret != -EOPNOTSUPP) { | |
1919 | SYSERROR("Failed to preserve time namespace"); | |
1920 | goto out_delete_net; | |
1921 | } | |
1922 | } else { | |
1923 | handler->nsfd[LXC_NS_TIME] = ret; | |
1924 | DEBUG("Preserved time namespace via fd %d", ret); | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | /* Run any host-side start hooks */ | |
1929 | ret = run_lxc_hooks(name, "start-host", conf, NULL); | |
1930 | if (ret < 0) { | |
1931 | ERROR("Failed to run lxc.hook.start-host"); | |
1932 | goto out_delete_net; | |
1933 | } | |
1934 | ||
1935 | /* Tell the child to complete its initialization and wait for it to exec | |
1936 | * or return an error. (The child will never return | |
1937 | * START_SYNC_READY_START+1. It will either close the sync pipe, causing | |
1938 | * lxc_sync_barrier_child to return success, or return a different | |
1939 | * value, causing us to error out). | |
1940 | */ | |
1941 | if (!lxc_sync_barrier_child(handler, START_SYNC_READY_START)) | |
1942 | goto out_delete_net; | |
1943 | ||
1944 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
1945 | ret = lxc_network_recv_name_and_ifindex_from_child(handler); | |
1946 | if (ret < 0) { | |
1947 | ERROR("Failed to receive names and ifindices for network devices from child"); | |
1948 | goto out_delete_net; | |
1949 | } | |
1950 | } | |
1951 | ||
1952 | ret = lxc_setup_devpts_parent(handler); | |
1953 | if (ret < 0) { | |
1954 | SYSERROR("Failed to receive devpts fd from child"); | |
1955 | goto out_delete_net; | |
1956 | } | |
1957 | ||
1958 | /* Now all networks are created, network devices are moved into place, | |
1959 | * and the correct names and ifindices in the respective namespaces have | |
1960 | * been recorded. The corresponding structs have now all been filled. So | |
1961 | * log them for debugging purposes. | |
1962 | */ | |
1963 | lxc_log_configured_netdevs(conf); | |
1964 | ||
1965 | /* Read tty fds allocated by child. */ | |
1966 | ret = lxc_recv_ttys_from_child(handler); | |
1967 | if (ret < 0) { | |
1968 | ERROR("Failed to receive tty info from child process"); | |
1969 | goto out_delete_net; | |
1970 | } | |
1971 | ||
1972 | ret = lxc_seccomp_recv_notifier_fd(&handler->conf->seccomp, data_sock1); | |
1973 | if (ret < 0) { | |
1974 | SYSERROR("Failed to receive seccomp notify fd from child"); | |
1975 | goto out_delete_net; | |
1976 | } | |
1977 | ||
1978 | ret = handler->ops->post_start(handler, handler->data); | |
1979 | if (ret < 0) | |
1980 | goto out_abort; | |
1981 | ||
1982 | ret = lxc_set_state(name, handler, RUNNING); | |
1983 | if (ret < 0) { | |
1984 | ERROR("Failed to set state to \"%s\"", lxc_state2str(RUNNING)); | |
1985 | goto out_abort; | |
1986 | } | |
1987 | ||
1988 | lxc_sync_fini(handler); | |
1989 | ||
1990 | return 0; | |
1991 | ||
1992 | out_delete_net: | |
1993 | if (handler->ns_clone_flags & CLONE_NEWNET) | |
1994 | lxc_delete_network(handler); | |
1995 | ||
1996 | out_abort: | |
1997 | lxc_abort(handler); | |
1998 | ||
1999 | out_sync_fini: | |
2000 | lxc_sync_fini(handler); | |
2001 | ||
2002 | return -1; | |
2003 | } | |
2004 | ||
2005 | int __lxc_start(struct lxc_handler *handler, struct lxc_operations *ops, | |
2006 | void *data, const char *lxcpath, bool daemonize, int *error_num) | |
2007 | { | |
2008 | int ret, status; | |
2009 | const char *name = handler->name; | |
2010 | struct lxc_conf *conf = handler->conf; | |
2011 | struct cgroup_ops *cgroup_ops; | |
2012 | ||
2013 | ret = lxc_init(name, handler); | |
2014 | if (ret < 0) { | |
2015 | ERROR("Failed to initialize container \"%s\"", name); | |
2016 | goto out_abort; | |
2017 | } | |
2018 | handler->ops = ops; | |
2019 | handler->data = data; | |
2020 | handler->daemonize = daemonize; | |
2021 | cgroup_ops = handler->cgroup_ops; | |
2022 | ||
2023 | if (!attach_block_device(handler->conf)) { | |
2024 | ERROR("Failed to attach block device"); | |
2025 | ret = -1; | |
2026 | goto out_abort; | |
2027 | } | |
2028 | ||
2029 | if (!cgroup_ops->monitor_create(cgroup_ops, handler)) { | |
2030 | ERROR("Failed to create monitor cgroup"); | |
2031 | ret = -1; | |
2032 | goto out_abort; | |
2033 | } | |
2034 | ||
2035 | if (!cgroup_ops->monitor_enter(cgroup_ops, handler)) { | |
2036 | ERROR("Failed to enter monitor cgroup"); | |
2037 | ret = -1; | |
2038 | goto out_abort; | |
2039 | } | |
2040 | ||
2041 | if (!cgroup_ops->monitor_delegate_controllers(cgroup_ops)) { | |
2042 | ERROR("Failed to delegate controllers to monitor cgroup"); | |
2043 | ret = -1; | |
2044 | goto out_abort; | |
2045 | } | |
2046 | ||
2047 | if (geteuid() == 0 && !lxc_list_empty(&conf->id_map)) { | |
2048 | /* If the backing store is a device, mount it here and now. */ | |
2049 | if (rootfs_is_blockdev(conf)) { | |
2050 | ret = unshare(CLONE_NEWNS); | |
2051 | if (ret < 0) { | |
2052 | ERROR("Failed to unshare CLONE_NEWNS"); | |
2053 | goto out_abort; | |
2054 | } | |
2055 | INFO("Unshared CLONE_NEWNS"); | |
2056 | ||
2057 | turn_into_dependent_mounts(); | |
2058 | ret = lxc_setup_rootfs_prepare_root(conf, name, lxcpath); | |
2059 | if (ret < 0) { | |
2060 | ERROR("Error setting up rootfs mount as root before spawn"); | |
2061 | goto out_abort; | |
2062 | } | |
2063 | INFO("Set up container rootfs as host root"); | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | ret = lxc_spawn(handler); | |
2068 | if (ret < 0) { | |
2069 | ERROR("Failed to spawn container \"%s\"", name); | |
2070 | goto out_detach_blockdev; | |
2071 | } | |
2072 | ||
2073 | handler->conf->reboot = REBOOT_NONE; | |
2074 | ||
2075 | ret = lxc_poll(name, handler); | |
2076 | if (ret) { | |
2077 | ERROR("LXC mainloop exited with error: %d", ret); | |
2078 | goto out_delete_network; | |
2079 | } | |
2080 | ||
2081 | if (!handler->init_died && handler->pid > 0) { | |
2082 | ERROR("Child process is not killed"); | |
2083 | ret = -1; | |
2084 | goto out_delete_network; | |
2085 | } | |
2086 | ||
2087 | status = lxc_wait_for_pid_status(handler->pid); | |
2088 | if (status < 0) | |
2089 | SYSERROR("Failed to retrieve status for %d", handler->pid); | |
2090 | ||
2091 | /* If the child process exited but was not signaled, it didn't call | |
2092 | * reboot. This should mean it was an lxc-execute which simply exited. | |
2093 | * In any case, treat it as a 'halt'. | |
2094 | */ | |
2095 | if (WIFSIGNALED(status)) { | |
2096 | switch(WTERMSIG(status)) { | |
2097 | case SIGINT: /* halt */ | |
2098 | DEBUG("Container \"%s\" is halting", name); | |
2099 | break; | |
2100 | case SIGHUP: /* reboot */ | |
2101 | DEBUG("Container \"%s\" is rebooting", name); | |
2102 | handler->conf->reboot = REBOOT_REQ; | |
2103 | break; | |
2104 | case SIGSYS: /* seccomp */ | |
2105 | DEBUG("Container \"%s\" violated its seccomp policy", name); | |
2106 | break; | |
2107 | default: | |
2108 | DEBUG("Unknown exit status for container \"%s\" init %d", name, WTERMSIG(status)); | |
2109 | break; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | ret = lxc_restore_phys_nics_to_netns(handler); | |
2114 | if (ret < 0) | |
2115 | ERROR("Failed to move physical network devices back to parent network namespace"); | |
2116 | ||
2117 | lxc_monitor_send_exit_code(name, status, handler->lxcpath); | |
2118 | lxc_error_set_and_log(handler->pid, status); | |
2119 | if (error_num) | |
2120 | *error_num = handler->exit_status; | |
2121 | ||
2122 | lxc_delete_network(handler); | |
2123 | detach_block_device(handler->conf); | |
2124 | lxc_end(handler); | |
2125 | return ret; | |
2126 | ||
2127 | out_abort: | |
2128 | lxc_abort(handler); | |
2129 | lxc_end(handler); | |
2130 | return ret; | |
2131 | ||
2132 | out_detach_blockdev: | |
2133 | lxc_abort(handler); | |
2134 | detach_block_device(handler->conf); | |
2135 | lxc_end(handler); | |
2136 | return ret; | |
2137 | ||
2138 | out_delete_network: | |
2139 | lxc_abort(handler); | |
2140 | lxc_restore_phys_nics_to_netns(handler); | |
2141 | lxc_delete_network(handler); | |
2142 | detach_block_device(handler->conf); | |
2143 | lxc_end(handler); | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | struct start_args { | |
2148 | char *const *argv; | |
2149 | }; | |
2150 | ||
2151 | static int start(struct lxc_handler *handler, void* data) | |
2152 | { | |
2153 | struct start_args *arg = data; | |
2154 | ||
2155 | NOTICE("Exec'ing \"%s\"", arg->argv[0]); | |
2156 | ||
2157 | execvp(arg->argv[0], arg->argv); | |
2158 | SYSERROR("Failed to exec \"%s\"", arg->argv[0]); | |
2159 | return 0; | |
2160 | } | |
2161 | ||
2162 | static int post_start(struct lxc_handler *handler, void* data) | |
2163 | { | |
2164 | struct start_args *arg = data; | |
2165 | ||
2166 | NOTICE("Started \"%s\" with pid \"%d\"", arg->argv[0], handler->pid); | |
2167 | return 0; | |
2168 | } | |
2169 | ||
2170 | static struct lxc_operations start_ops = { | |
2171 | .start = start, | |
2172 | .post_start = post_start | |
2173 | }; | |
2174 | ||
2175 | int lxc_start(char *const argv[], struct lxc_handler *handler, | |
2176 | const char *lxcpath, bool daemonize, int *error_num) | |
2177 | { | |
2178 | struct start_args start_arg = { | |
2179 | .argv = argv, | |
2180 | }; | |
2181 | ||
2182 | TRACE("Doing lxc_start"); | |
2183 | return __lxc_start(handler, &start_ops, &start_arg, lxcpath, daemonize, error_num); | |
2184 | } | |
2185 | ||
2186 | static void lxc_destroy_container_on_signal(struct lxc_handler *handler, | |
2187 | const char *name) | |
2188 | { | |
2189 | char destroy[PATH_MAX]; | |
2190 | struct lxc_container *c; | |
2191 | int ret = 0; | |
2192 | bool bret = true; | |
2193 | ||
2194 | if (handler->conf->rootfs.path && handler->conf->rootfs.mount) { | |
2195 | bret = do_destroy_container(handler); | |
2196 | if (!bret) { | |
2197 | ERROR("Error destroying rootfs for container \"%s\"", name); | |
2198 | return; | |
2199 | } | |
2200 | } | |
2201 | INFO("Destroyed rootfs for container \"%s\"", name); | |
2202 | ||
2203 | ret = snprintf(destroy, PATH_MAX, "%s/%s", handler->lxcpath, name); | |
2204 | if (ret < 0 || ret >= PATH_MAX) { | |
2205 | ERROR("Error destroying directory for container \"%s\"", name); | |
2206 | return; | |
2207 | } | |
2208 | ||
2209 | c = lxc_container_new(name, handler->lxcpath); | |
2210 | if (c) { | |
2211 | if (container_disk_lock(c)) { | |
2212 | INFO("Could not update lxc_snapshots file"); | |
2213 | lxc_container_put(c); | |
2214 | } else { | |
2215 | mod_all_rdeps(c, false); | |
2216 | container_disk_unlock(c); | |
2217 | lxc_container_put(c); | |
2218 | } | |
2219 | } | |
2220 | ||
2221 | if (!handler->am_root) | |
2222 | ret = userns_exec_full(handler->conf, lxc_rmdir_onedev_wrapper, | |
2223 | destroy, "lxc_rmdir_onedev_wrapper"); | |
2224 | else | |
2225 | ret = lxc_rmdir_onedev(destroy, NULL); | |
2226 | ||
2227 | if (ret < 0) { | |
2228 | ERROR("Error destroying directory for container \"%s\"", name); | |
2229 | return; | |
2230 | } | |
2231 | INFO("Destroyed directory for container \"%s\"", name); | |
2232 | } | |
2233 | ||
2234 | static int lxc_rmdir_onedev_wrapper(void *data) | |
2235 | { | |
2236 | char *arg = (char *) data; | |
2237 | return lxc_rmdir_onedev(arg, NULL); | |
2238 | } | |
2239 | ||
2240 | static bool do_destroy_container(struct lxc_handler *handler) | |
2241 | { | |
2242 | int ret; | |
2243 | ||
2244 | if (!handler->am_root) { | |
2245 | ret = userns_exec_full(handler->conf, storage_destroy_wrapper, | |
2246 | handler->conf, "storage_destroy_wrapper"); | |
2247 | if (ret < 0) | |
2248 | return false; | |
2249 | ||
2250 | return true; | |
2251 | } | |
2252 | ||
2253 | return storage_destroy(handler->conf); | |
2254 | } |