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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
35a02107 CB |
8 | * Serge Hallyn <serge@hallyn.com> |
9 | * Christian Brauner <christian.brauner@ubuntu.com> | |
0ad19a3f | 10 | * |
11 | * This library is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU Lesser General Public | |
13 | * License as published by the Free Software Foundation; either | |
14 | * version 2.1 of the License, or (at your option) any later version. | |
15 | * | |
16 | * This library is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * Lesser General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU Lesser General Public | |
22 | * License along with this library; if not, write to the Free Software | |
250b1eec | 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 24 | */ |
25 | ||
d38dd64a CB |
26 | #ifndef _GNU_SOURCE |
27 | #define _GNU_SOURCE 1 | |
28 | #endif | |
0ad19a3f | 29 | #include <dirent.h> |
30 | #include <errno.h> | |
b0a33c1e | 31 | #include <fcntl.h> |
c476bdce | 32 | #include <grp.h> |
37515ebd | 33 | #include <poll.h> |
b467714b | 34 | #include <pthread.h> |
f3787121 CB |
35 | #include <signal.h> |
36 | #include <stdio.h> | |
37 | #include <stdlib.h> | |
38 | #include <string.h> | |
0ad19a3f | 39 | #include <sys/file.h> |
f4d507d5 | 40 | #include <sys/mount.h> |
f3787121 | 41 | #include <sys/param.h> |
0ad19a3f | 42 | #include <sys/prctl.h> |
f3787121 CB |
43 | #include <sys/socket.h> |
44 | #include <sys/stat.h> | |
45 | #include <sys/syscall.h> | |
ddceb1f9 | 46 | #include <sys/types.h> |
b0a33c1e | 47 | #include <sys/un.h> |
f3787121 | 48 | #include <sys/wait.h> |
d38dd64a | 49 | #include <unistd.h> |
495d2046 | 50 | |
f3787121 CB |
51 | #include "af_unix.h" |
52 | #include "caps.h" | |
563f2f2c | 53 | #include "cgroup.h" |
f3787121 | 54 | #include "commands.h" |
bbf5cf35 | 55 | #include "commands_utils.h" |
f3787121 | 56 | #include "conf.h" |
d38dd64a | 57 | #include "config.h" |
74c6e2b0 | 58 | #include "confile_utils.h" |
e2bcd7db | 59 | #include "error.h" |
7fbb15ec | 60 | #include "file_utils.h" |
1cc8bd4b | 61 | #include "list.h" |
f3787121 | 62 | #include "log.h" |
d38dd64a | 63 | #include "lsm/lsm.h" |
f2d5a09d | 64 | #include "lxccontainer.h" |
f3787121 CB |
65 | #include "lxclock.h" |
66 | #include "lxcseccomp.h" | |
3ef9b3d3 | 67 | #include "macro.h" |
f3787121 | 68 | #include "mainloop.h" |
4ffeaf27 | 69 | #include "memory_utils.h" |
63376d7d | 70 | #include "monitor.h" |
f549edcc | 71 | #include "namespace.h" |
811ef482 | 72 | #include "network.h" |
38e5c2db | 73 | #include "raw_syscalls.h" |
f3787121 | 74 | #include "start.h" |
6be5397b CB |
75 | #include "storage/storage.h" |
76 | #include "storage/storage_utils.h" | |
0ed9b1bc | 77 | #include "sync.h" |
59524108 | 78 | #include "syscall_wrappers.h" |
0ed9b1bc CB |
79 | #include "terminal.h" |
80 | #include "utils.h" | |
36eb9bde | 81 | |
d38dd64a CB |
82 | #if HAVE_LIBCAP |
83 | #include <sys/capability.h> | |
84 | #endif | |
85 | ||
9de31d5a CB |
86 | #ifndef HAVE_STRLCPY |
87 | #include "include/strlcpy.h" | |
88 | #endif | |
89 | ||
ac2cecc4 | 90 | lxc_log_define(start, lxc); |
36eb9bde | 91 | |
f01f7975 | 92 | extern void mod_all_rdeps(struct lxc_container *c, bool inc); |
790255cf | 93 | static bool do_destroy_container(struct lxc_handler *handler); |
28272964 CB |
94 | static int lxc_rmdir_onedev_wrapper(void *data); |
95 | static void lxc_destroy_container_on_signal(struct lxc_handler *handler, | |
96 | const char *name); | |
97 | ||
c8154066 SH |
98 | static void print_top_failing_dir(const char *path) |
99 | { | |
dcd9a847 | 100 | __do_free char *copy = NULL; |
9e5f5f2f | 101 | int ret; |
4ffeaf27 | 102 | char *e, *p, saved; |
cbb9c7c7 | 103 | |
4ffeaf27 | 104 | copy = must_copy_string(path); |
c8154066 | 105 | p = copy; |
4ffeaf27 | 106 | e = copy + strlen(path); |
cbb9c7c7 | 107 | |
c8154066 | 108 | while (p < e) { |
f3787121 CB |
109 | while (p < e && *p == '/') |
110 | p++; | |
9e5f5f2f | 111 | |
f3787121 CB |
112 | while (p < e && *p != '/') |
113 | p++; | |
9e5f5f2f | 114 | |
c8154066 SH |
115 | saved = *p; |
116 | *p = '\0'; | |
9e5f5f2f CB |
117 | |
118 | ret = access(copy, X_OK); | |
119 | if (ret != 0) { | |
408da065 CB |
120 | SYSERROR("Could not access %s. Please grant it x " |
121 | "access, or add an ACL for the container " | |
9e5f5f2f | 122 | "root", copy); |
c8154066 SH |
123 | return; |
124 | } | |
125 | *p = saved; | |
126 | } | |
127 | } | |
128 | ||
5032bf39 | 129 | static void lxc_put_nsfds(struct lxc_handler *handler) |
408da065 | 130 | { |
9f30a190 MM |
131 | int i; |
132 | ||
9f30a190 | 133 | for (i = 0; i < LXC_NS_MAX; i++) { |
5032bf39 | 134 | if (handler->nsfd[i] < 0) |
39cd919c CB |
135 | continue; |
136 | ||
5032bf39 CB |
137 | close(handler->nsfd[i]); |
138 | handler->nsfd[i] = -EBADF; | |
9f30a190 | 139 | } |
9f30a190 MM |
140 | } |
141 | ||
4cb53844 CB |
142 | static int lxc_try_preserve_ns(const int pid, const char *ns) |
143 | { | |
144 | int fd; | |
145 | ||
146 | fd = lxc_preserve_ns(pid, ns); | |
147 | if (fd < 0) { | |
148 | if (errno != ENOENT) { | |
149 | SYSERROR("Failed to preserve %s namespace", ns); | |
150 | return -EINVAL; | |
151 | } | |
152 | ||
a24c5678 | 153 | SYSWARN("Kernel does not support preserving %s namespaces", ns); |
4cb53844 CB |
154 | return -EOPNOTSUPP; |
155 | } | |
156 | ||
157 | return fd; | |
158 | } | |
159 | ||
160 | /* lxc_try_preserve_namespaces: open /proc/@pid/ns/@ns for each namespace | |
161 | * specified in ns_clone_flags. | |
4d8ac866 | 162 | * Return true on success, false on failure. |
62d05d9b | 163 | */ |
4cb53844 CB |
164 | static bool lxc_try_preserve_namespaces(struct lxc_handler *handler, |
165 | int ns_clone_flags, pid_t pid) | |
f3787121 | 166 | { |
9fef3355 | 167 | int i; |
9f30a190 | 168 | |
9f30a190 | 169 | for (i = 0; i < LXC_NS_MAX; i++) |
5032bf39 | 170 | handler->nsfd[i] = -EBADF; |
cd43d2d1 | 171 | |
9f30a190 | 172 | for (i = 0; i < LXC_NS_MAX; i++) { |
4cb53844 CB |
173 | int fd; |
174 | ||
becad0ec | 175 | if ((ns_clone_flags & ns_info[i].clone_flag) == 0) |
9f30a190 | 176 | continue; |
28d9e29e | 177 | |
4cb53844 CB |
178 | fd = lxc_try_preserve_ns(pid, ns_info[i].proc_name); |
179 | if (fd < 0) { | |
4cb53844 CB |
180 | /* Do not fail to start container on kernels that do |
181 | * not support interacting with namespaces through | |
182 | * /proc. | |
183 | */ | |
184 | if (fd == -EOPNOTSUPP) | |
185 | continue; | |
fa3a5b22 | 186 | |
4cb53844 CB |
187 | lxc_put_nsfds(handler); |
188 | return false; | |
189 | } | |
190 | ||
191 | handler->nsfd[i] = fd; | |
192 | DEBUG("Preserved %s namespace via fd %d", ns_info[i].proc_name, | |
193 | handler->nsfd[i]); | |
9f30a190 MM |
194 | } |
195 | ||
62d05d9b | 196 | return true; |
9f30a190 MM |
197 | } |
198 | ||
ec1dc633 | 199 | static inline bool match_stdfds(int fd) |
80090207 | 200 | { |
ec1dc633 | 201 | return (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO); |
80090207 CLG |
202 | } |
203 | ||
4c03724e | 204 | #ifdef HAVE_DLOG |
205 | static bool match_dlog_fds(struct dirent *direntp) | |
206 | { | |
207 | char path[PATH_MAX] = {0}; | |
208 | char link[PATH_MAX] = {0}; | |
209 | ssize_t linklen; | |
210 | int ret; | |
211 | ||
212 | ret = snprintf(path, PATH_MAX, "/proc/self/fd/%s", direntp->d_name); | |
213 | if (ret < 0 || ret >= PATH_MAX) { | |
214 | ERROR("Failed to create file descriptor name"); | |
215 | return false; | |
216 | } | |
217 | ||
218 | linklen = readlink(path, link, PATH_MAX); | |
219 | if (linklen < 0) { | |
220 | SYSERROR("Failed to read link path - \"%s\"", path); | |
221 | return false; | |
222 | } else if (linklen >= PATH_MAX) { | |
223 | ERROR("The name of link path is too long - \"%s\"", path); | |
224 | return false; | |
225 | } | |
226 | ||
227 | if (strcmp(link, "/dev/log_main") == 0 || | |
228 | strcmp(link, "/dev/log_system") == 0 || | |
229 | strcmp(link, "/dev/log_radio") == 0) | |
230 | return true; | |
231 | ||
232 | return false; | |
233 | } | |
234 | #endif | |
235 | ||
47a46cf1 CB |
236 | int lxc_check_inherited(struct lxc_conf *conf, bool closeall, |
237 | int *fds_to_ignore, size_t len_fds) | |
80090207 | 238 | { |
80090207 | 239 | int fd, fddir; |
47a46cf1 | 240 | size_t i; |
80090207 | 241 | DIR *dir; |
a5a70219 | 242 | struct dirent *direntp; |
80090207 | 243 | |
d2cf4c37 SH |
244 | if (conf && conf->close_all_fds) |
245 | closeall = true; | |
246 | ||
b119f362 | 247 | restart: |
80090207 CLG |
248 | dir = opendir("/proc/self/fd"); |
249 | if (!dir) { | |
a24c5678 | 250 | SYSWARN("Failed to open directory"); |
80090207 CLG |
251 | return -1; |
252 | } | |
253 | ||
254 | fddir = dirfd(dir); | |
255 | ||
74f96976 | 256 | while ((direntp = readdir(dir))) { |
a5a70219 | 257 | int ret; |
d39b10eb CB |
258 | struct lxc_list *cur; |
259 | bool matched = false; | |
260 | ||
a5a70219 | 261 | if (strcmp(direntp->d_name, ".") == 0) |
80090207 CLG |
262 | continue; |
263 | ||
a5a70219 | 264 | if (strcmp(direntp->d_name, "..") == 0) |
80090207 CLG |
265 | continue; |
266 | ||
a5a70219 CB |
267 | ret = lxc_safe_int(direntp->d_name, &fd); |
268 | if (ret < 0) { | |
269 | INFO("Could not parse file descriptor for \"%s\"", direntp->d_name); | |
d4cff0d2 CB |
270 | continue; |
271 | } | |
80090207 | 272 | |
47a46cf1 CB |
273 | for (i = 0; i < len_fds; i++) |
274 | if (fds_to_ignore[i] == fd) | |
275 | break; | |
276 | ||
277 | if (fd == fddir || fd == lxc_log_fd || | |
278 | (i < len_fds && fd == fds_to_ignore[i])) | |
80090207 CLG |
279 | continue; |
280 | ||
d39b10eb | 281 | /* Keep state clients that wait on reboots. */ |
3ee9e4fb CB |
282 | if (conf) { |
283 | lxc_list_for_each(cur, &conf->state_clients) { | |
284 | struct lxc_state_client *client = cur->elem; | |
d39b10eb | 285 | |
3ee9e4fb CB |
286 | if (client->clientfd != fd) |
287 | continue; | |
d39b10eb | 288 | |
3ee9e4fb CB |
289 | matched = true; |
290 | break; | |
291 | } | |
d39b10eb CB |
292 | } |
293 | ||
294 | if (matched) | |
295 | continue; | |
296 | ||
858377e4 SH |
297 | if (current_config && fd == current_config->logfd) |
298 | continue; | |
299 | ||
ec1dc633 | 300 | if (match_stdfds(fd)) |
80090207 | 301 | continue; |
80090207 | 302 | |
1d5e5f26 | 303 | #ifdef HAVE_DLOG |
304 | if (match_dlog_fds(direntp)) | |
305 | continue; | |
306 | ||
307 | #endif | |
d2cf4c37 | 308 | if (closeall) { |
b119f362 SH |
309 | close(fd); |
310 | closedir(dir); | |
28d9e29e | 311 | INFO("Closed inherited fd %d", fd); |
b119f362 SH |
312 | goto restart; |
313 | } | |
28d9e29e | 314 | WARN("Inherited fd %d", fd); |
80090207 CLG |
315 | } |
316 | ||
408da065 | 317 | /* Only enable syslog at this point to avoid the above logging function |
64c57ea1 BD |
318 | * to open a new fd and make the check_inherited function enter an |
319 | * infinite loop. | |
320 | */ | |
321 | lxc_log_enable_syslog(); | |
322 | ||
92c7f629 GK |
323 | closedir(dir); /* cannot fail */ |
324 | return 0; | |
80090207 CLG |
325 | } |
326 | ||
83ee7875 | 327 | static int setup_signal_fd(sigset_t *oldmask) |
b0a33c1e | 328 | { |
7288dfb6 | 329 | int ret; |
b0a33c1e | 330 | sigset_t mask; |
7288dfb6 | 331 | const int signals[] = {SIGBUS, SIGILL, SIGSEGV, SIGWINCH}; |
b0a33c1e | 332 | |
408da065 | 333 | /* Block everything except serious error signals. */ |
df0795b1 CB |
334 | ret = sigfillset(&mask); |
335 | if (ret < 0) | |
336 | return -EBADF; | |
337 | ||
9b10bef5 | 338 | for (int sig = 0; sig < (sizeof(signals) / sizeof(signals[0])); sig++) { |
df0795b1 CB |
339 | ret = sigdelset(&mask, signals[sig]); |
340 | if (ret < 0) | |
341 | return -EBADF; | |
b0a33c1e | 342 | } |
343 | ||
b467714b | 344 | ret = pthread_sigmask(SIG_BLOCK, &mask, oldmask); |
df0795b1 CB |
345 | if (ret < 0) { |
346 | SYSERROR("Failed to set signal mask"); | |
347 | return -EBADF; | |
b0a33c1e | 348 | } |
349 | ||
df0795b1 CB |
350 | ret = signalfd(-1, &mask, SFD_CLOEXEC); |
351 | if (ret < 0) { | |
352 | SYSERROR("Failed to create signal file descriptor"); | |
353 | return -EBADF; | |
b0a33c1e | 354 | } |
355 | ||
df0795b1 | 356 | TRACE("Created signal file descriptor %d", ret); |
1ac470c0 | 357 | |
df0795b1 | 358 | return ret; |
b0a33c1e | 359 | } |
360 | ||
84c92abd | 361 | static int signal_handler(int fd, uint32_t events, void *data, |
f3787121 | 362 | struct lxc_epoll_descr *descr) |
b0a33c1e | 363 | { |
15cd25fd | 364 | int ret; |
3c319edb CB |
365 | siginfo_t info; |
366 | struct signalfd_siginfo siginfo; | |
367 | struct lxc_handler *hdlr = data; | |
15cd25fd | 368 | |
489f39be | 369 | ret = lxc_read_nointr(fd, &siginfo, sizeof(siginfo)); |
15cd25fd | 370 | if (ret < 0) { |
6e94162a | 371 | ERROR("Failed to read signal info from signal file descriptor %d", fd); |
b2a48508 | 372 | return LXC_MAINLOOP_ERROR; |
15cd25fd DL |
373 | } |
374 | ||
375 | if (ret != sizeof(siginfo)) { | |
6e94162a CB |
376 | ERROR("Unexpected size for struct signalfd_siginfo"); |
377 | return -EINVAL; | |
15cd25fd DL |
378 | } |
379 | ||
408da065 | 380 | /* Check whether init is running. */ |
80507ee8 | 381 | info.si_pid = 0; |
3c319edb CB |
382 | ret = waitid(P_PID, hdlr->pid, &info, WEXITED | WNOWAIT | WNOHANG); |
383 | if (ret == 0 && info.si_pid == hdlr->pid) | |
384 | hdlr->init_died = true; | |
80507ee8 | 385 | |
cd5177e9 TA |
386 | /* Try to figure out a reasonable exit status to report. */ |
387 | if (hdlr->init_died) { | |
388 | switch (info.si_code) { | |
389 | case CLD_EXITED: | |
390 | hdlr->exit_status = info.si_status << 8; | |
391 | break; | |
392 | case CLD_KILLED: | |
393 | case CLD_DUMPED: | |
394 | case CLD_STOPPED: | |
395 | hdlr->exit_status = info.si_status << 8 | 0x7f; | |
396 | break; | |
397 | case CLD_CONTINUED: | |
398 | /* Huh? The waitid() told us it's dead *and* continued? */ | |
399 | WARN("Init %d dead and continued?", hdlr->pid); | |
400 | hdlr->exit_status = 1; | |
401 | break; | |
402 | default: | |
20993a97 | 403 | ERROR("Unknown si_code: %d", info.si_code); |
55e1311e | 404 | hdlr->exit_status = 1; |
cd5177e9 TA |
405 | } |
406 | } | |
407 | ||
d4b5d7a8 TA |
408 | if (siginfo.ssi_signo == SIGHUP) { |
409 | kill(hdlr->pid, SIGTERM); | |
410 | INFO("Killing %d since terminal hung up", hdlr->pid); | |
9b10bef5 CB |
411 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE |
412 | : LXC_MAINLOOP_CONTINUE; | |
d4b5d7a8 TA |
413 | } |
414 | ||
9cb94384 TA |
415 | if (siginfo.ssi_signo != SIGCHLD) { |
416 | kill(hdlr->pid, siginfo.ssi_signo); | |
417 | INFO("Forwarded signal %d to pid %d", siginfo.ssi_signo, hdlr->pid); | |
9b10bef5 CB |
418 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE |
419 | : LXC_MAINLOOP_CONTINUE; | |
9cb94384 TA |
420 | } |
421 | ||
3a9e949f TA |
422 | /* More robustness, protect ourself from a SIGCHLD sent |
423 | * by a process different from the container init. | |
424 | */ | |
425 | if (siginfo.ssi_pid != hdlr->pid) { | |
6e94162a CB |
426 | NOTICE("Received %d from pid %d instead of container init %d", |
427 | siginfo.ssi_signo, siginfo.ssi_pid, hdlr->pid); | |
9b10bef5 CB |
428 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE |
429 | : LXC_MAINLOOP_CONTINUE; | |
3a9e949f TA |
430 | } |
431 | ||
408da065 | 432 | if (siginfo.ssi_code == CLD_STOPPED) { |
6e94162a | 433 | INFO("Container init process was stopped"); |
9b10bef5 CB |
434 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE |
435 | : LXC_MAINLOOP_CONTINUE; | |
436 | } | |
437 | ||
438 | if (siginfo.ssi_code == CLD_CONTINUED) { | |
6e94162a | 439 | INFO("Container init process was continued"); |
9b10bef5 CB |
440 | return hdlr->init_died ? LXC_MAINLOOP_CLOSE |
441 | : LXC_MAINLOOP_CONTINUE; | |
15cd25fd | 442 | } |
1ac470c0 | 443 | |
6e94162a | 444 | DEBUG("Container init process %d exited", hdlr->pid); |
9b10bef5 | 445 | |
3c319edb | 446 | return LXC_MAINLOOP_CLOSE; |
b0a33c1e | 447 | } |
448 | ||
974a8aba CB |
449 | int lxc_serve_state_clients(const char *name, struct lxc_handler *handler, |
450 | lxc_state_t state) | |
66aeffc7 | 451 | { |
9de31d5a | 452 | size_t retlen; |
dbc9832d CB |
453 | ssize_t ret; |
454 | struct lxc_list *cur, *next; | |
dbc9832d CB |
455 | struct lxc_msg msg = {.type = lxc_msg_state, .value = state}; |
456 | ||
974a8aba CB |
457 | if (state == THAWED) |
458 | handler->state = RUNNING; | |
459 | else | |
460 | handler->state = state; | |
461 | ||
9dfa4041 | 462 | TRACE("Set container state to %s", lxc_state2str(state)); |
dbc9832d | 463 | |
d39b10eb | 464 | if (lxc_list_empty(&handler->conf->state_clients)) { |
9dfa4041 | 465 | TRACE("No state clients registered"); |
dbc9832d CB |
466 | return 0; |
467 | } | |
468 | ||
9de31d5a CB |
469 | retlen = strlcpy(msg.name, name, sizeof(msg.name)); |
470 | if (retlen >= sizeof(msg.name)) | |
471 | return -E2BIG; | |
dbc9832d | 472 | |
d39b10eb | 473 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
d85617bc | 474 | struct lxc_state_client *client = cur->elem; |
dbc9832d | 475 | |
d39b10eb | 476 | if (client->states[state] == 0) { |
9dfa4041 | 477 | TRACE("State %s not registered for state client %d", |
dbc9832d CB |
478 | lxc_state2str(state), client->clientfd); |
479 | continue; | |
480 | } | |
481 | ||
9dfa4041 | 482 | TRACE("Sending state %s to state client %d", |
dbc9832d CB |
483 | lxc_state2str(state), client->clientfd); |
484 | ||
7fbb15ec CB |
485 | ret = lxc_send_nointr(client->clientfd, &msg, sizeof(msg), MSG_NOSIGNAL); |
486 | if (ret <= 0) | |
6d1400b5 | 487 | SYSERROR("Failed to send message to client"); |
dbc9832d CB |
488 | |
489 | /* kick client from list */ | |
dbc9832d | 490 | lxc_list_del(cur); |
300d1cb4 | 491 | close(client->clientfd); |
dbc9832d CB |
492 | free(cur->elem); |
493 | free(cur); | |
494 | } | |
dbc9832d | 495 | |
5e5576a4 CB |
496 | return 0; |
497 | } | |
498 | ||
499 | static int lxc_serve_state_socket_pair(const char *name, | |
500 | struct lxc_handler *handler, | |
501 | lxc_state_t state) | |
502 | { | |
503 | ssize_t ret; | |
504 | ||
bb955810 | 505 | if (!handler->daemonize || |
5e5576a4 CB |
506 | handler->state_socket_pair[1] < 0 || |
507 | state == STARTING) | |
508 | return 0; | |
509 | ||
510 | /* Close read end of the socket pair. */ | |
511 | close(handler->state_socket_pair[0]); | |
512 | handler->state_socket_pair[0] = -1; | |
513 | ||
ee8377bd | 514 | again: |
5e5576a4 CB |
515 | ret = lxc_abstract_unix_send_credential(handler->state_socket_pair[1], |
516 | &(int){state}, sizeof(int)); | |
9044b79e | 517 | if (ret < 0) { |
518 | SYSERROR("Failed to send state to %d", handler->state_socket_pair[1]); | |
519 | ||
ee8377bd CB |
520 | if (errno == EINTR) |
521 | goto again; | |
9044b79e | 522 | |
523 | return -1; | |
524 | } | |
525 | ||
526 | if (ret != sizeof(int)) { | |
527 | ERROR("Message too long : %d", handler->state_socket_pair[1]); | |
ee8377bd CB |
528 | return -1; |
529 | } | |
5e5576a4 CB |
530 | |
531 | TRACE("Sent container state \"%s\" to %d", lxc_state2str(state), | |
532 | handler->state_socket_pair[1]); | |
533 | ||
534 | /* Close write end of the socket pair. */ | |
535 | close(handler->state_socket_pair[1]); | |
536 | handler->state_socket_pair[1] = -1; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | int lxc_set_state(const char *name, struct lxc_handler *handler, | |
542 | lxc_state_t state) | |
543 | { | |
544 | int ret; | |
545 | ||
546 | ret = lxc_serve_state_socket_pair(name, handler, state); | |
547 | if (ret < 0) { | |
548 | ERROR("Failed to synchronize via anonymous pair of unix sockets"); | |
549 | return -1; | |
550 | } | |
551 | ||
552 | ret = lxc_serve_state_clients(name, handler, state); | |
553 | if (ret < 0) | |
554 | return -1; | |
555 | ||
dbc9832d CB |
556 | /* This function will try to connect to the legacy lxc-monitord state |
557 | * server and only exists for backwards compatibility. | |
558 | */ | |
9123e471 | 559 | lxc_monitor_send_state(name, state, handler->lxcpath); |
dbc9832d | 560 | |
66aeffc7 DL |
561 | return 0; |
562 | } | |
563 | ||
735f2c6e | 564 | int lxc_poll(const char *name, struct lxc_handler *handler) |
b0a33c1e | 565 | { |
3c319edb | 566 | int ret; |
86530b0a | 567 | bool has_console = true; |
3c319edb | 568 | struct lxc_epoll_descr descr, descr_console; |
b0a33c1e | 569 | |
03760215 CB |
570 | if (handler->conf->console.path && |
571 | strcmp(handler->conf->console.path, "none") == 0) | |
86530b0a L |
572 | has_console = false; |
573 | ||
3c319edb CB |
574 | ret = lxc_mainloop_open(&descr); |
575 | if (ret < 0) { | |
576 | ERROR("Failed to create mainloop"); | |
50c8bf05 | 577 | goto out_sigfd; |
b0a33c1e | 578 | } |
579 | ||
30a33fbd CB |
580 | if (has_console) { |
581 | ret = lxc_mainloop_open(&descr_console); | |
582 | if (ret < 0) { | |
583 | ERROR("Failed to create console mainloop"); | |
584 | goto out_mainloop; | |
585 | } | |
3c319edb CB |
586 | } |
587 | ||
1cc8bd4b | 588 | ret = lxc_mainloop_add_handler(&descr, handler->sigfd, signal_handler, handler); |
3c319edb | 589 | if (ret < 0) { |
1cc8bd4b | 590 | ERROR("Failed to add signal handler for %d to mainloop", handler->sigfd); |
3c319edb | 591 | goto out_mainloop_console; |
b0a33c1e | 592 | } |
593 | ||
2ac0f627 CB |
594 | ret = lxc_seccomp_setup_proxy(&handler->conf->seccomp, &descr, handler); |
595 | if (ret < 0) { | |
596 | ERROR("Failed to setup seccomp proxy"); | |
c3e3c21a | 597 | goto out_mainloop_console; |
2ac0f627 | 598 | } |
cdb2a47f | 599 | |
30a33fbd | 600 | if (has_console) { |
dcad02f8 | 601 | struct lxc_terminal *console = &handler->conf->console; |
63376d7d | 602 | |
093bce5f | 603 | ret = lxc_terminal_mainloop_add(&descr, console); |
30a33fbd CB |
604 | if (ret < 0) { |
605 | ERROR("Failed to add console handlers to mainloop"); | |
606 | goto out_mainloop_console; | |
607 | } | |
608 | ||
093bce5f | 609 | ret = lxc_terminal_mainloop_add(&descr_console, console); |
30a33fbd CB |
610 | if (ret < 0) { |
611 | ERROR("Failed to add console handlers to console mainloop"); | |
612 | goto out_mainloop_console; | |
613 | } | |
a54585ad L |
614 | |
615 | handler->conf->console.descr = &descr; | |
563f2f2c DL |
616 | } |
617 | ||
3c319edb CB |
618 | ret = lxc_cmd_mainloop_add(name, &descr, handler); |
619 | if (ret < 0) { | |
620 | ERROR("Failed to add command handler to mainloop"); | |
621 | goto out_mainloop_console; | |
622 | } | |
b0a33c1e | 623 | |
3c319edb | 624 | TRACE("Mainloop is ready"); |
b0a33c1e | 625 | |
3c319edb | 626 | ret = lxc_mainloop(&descr, -1); |
1cc8bd4b CB |
627 | close(descr.epfd); |
628 | descr.epfd = -EBADF; | |
629 | if (ret < 0 || !handler->init_died) | |
42b09f94 | 630 | goto out_mainloop_console; |
1cc8bd4b | 631 | |
30a33fbd CB |
632 | if (has_console) |
633 | ret = lxc_mainloop(&descr_console, 0); | |
634 | ||
3c319edb | 635 | out_mainloop_console: |
30a33fbd CB |
636 | if (has_console) { |
637 | lxc_mainloop_close(&descr_console); | |
638 | TRACE("Closed console mainloop"); | |
639 | } | |
3c319edb | 640 | |
42b09f94 CB |
641 | out_mainloop: |
642 | lxc_mainloop_close(&descr); | |
643 | TRACE("Closed mainloop"); | |
644 | ||
b0a33c1e | 645 | out_sigfd: |
1cc8bd4b CB |
646 | close(handler->sigfd); |
647 | TRACE("Closed signal file descriptor %d", handler->sigfd); | |
648 | handler->sigfd = -EBADF; | |
408da065 | 649 | |
1cc8bd4b | 650 | return ret; |
b0a33c1e | 651 | } |
652 | ||
41784e4e CB |
653 | void lxc_zero_handler(struct lxc_handler *handler) |
654 | { | |
655 | int i; | |
656 | ||
657 | memset(handler, 0, sizeof(struct lxc_handler)); | |
658 | ||
41784e4e CB |
659 | handler->pinfd = -1; |
660 | ||
661 | handler->sigfd = -1; | |
662 | ||
663 | for (i = 0; i < LXC_NS_MAX; i++) | |
664 | handler->nsfd[i] = -1; | |
665 | ||
666 | handler->data_sock[0] = -1; | |
667 | handler->data_sock[1] = -1; | |
668 | ||
669 | handler->state_socket_pair[0] = -1; | |
670 | handler->state_socket_pair[1] = -1; | |
671 | ||
672 | handler->sync_sock[0] = -1; | |
673 | handler->sync_sock[1] = -1; | |
674 | } | |
675 | ||
f2e07cb6 CB |
676 | void lxc_free_handler(struct lxc_handler *handler) |
677 | { | |
1cc8bd4b CB |
678 | if (handler->pinfd >= 0) |
679 | close(handler->pinfd); | |
680 | ||
681 | if (handler->sigfd >= 0) | |
682 | close(handler->sigfd); | |
683 | ||
684 | lxc_put_nsfds(handler); | |
685 | ||
80308d07 | 686 | if (handler->conf && handler->conf->reboot == REBOOT_NONE) |
0d0d3655 | 687 | if (handler->conf->maincmd_fd >= 0) |
9044b79e | 688 | lxc_abstract_unix_close(handler->conf->maincmd_fd); |
f2e07cb6 | 689 | |
5e5576a4 CB |
690 | if (handler->state_socket_pair[0] >= 0) |
691 | close(handler->state_socket_pair[0]); | |
692 | ||
693 | if (handler->state_socket_pair[1] >= 0) | |
694 | close(handler->state_socket_pair[1]); | |
695 | ||
9b10bef5 CB |
696 | if (handler->cgroup_ops) |
697 | cgroup_exit(handler->cgroup_ops); | |
698 | ||
f2e07cb6 CB |
699 | handler->conf = NULL; |
700 | free(handler); | |
1cc8bd4b | 701 | handler = NULL; |
f2e07cb6 CB |
702 | } |
703 | ||
aa460476 | 704 | struct lxc_handler *lxc_init_handler(const char *name, struct lxc_conf *conf, |
5e5576a4 | 705 | const char *lxcpath, bool daemonize) |
59eb99ba | 706 | { |
5e5576a4 | 707 | int i, ret; |
3a0f472d DL |
708 | struct lxc_handler *handler; |
709 | ||
710 | handler = malloc(sizeof(*handler)); | |
fdecbc9c | 711 | if (!handler) |
3a0f472d | 712 | return NULL; |
9044b79e | 713 | |
59eb99ba DL |
714 | memset(handler, 0, sizeof(*handler)); |
715 | ||
fdecbc9c CB |
716 | /* Note that am_guest_unpriv() checks the effective uid. We |
717 | * probably don't care if we are real root only if we are running | |
718 | * as root so this should be fine. | |
790255cf | 719 | */ |
e0010464 | 720 | handler->am_root = !am_guest_unpriv(); |
c6012571 | 721 | handler->data_sock[0] = handler->data_sock[1] = -1; |
fae349da | 722 | handler->conf = conf; |
9123e471 | 723 | handler->lxcpath = lxcpath; |
5c068da9 | 724 | handler->pinfd = -1; |
1cc8bd4b CB |
725 | handler->sigfd = -EBADF; |
726 | handler->init_died = false; | |
5e5576a4 | 727 | handler->state_socket_pair[0] = handler->state_socket_pair[1] = -1; |
80308d07 | 728 | if (handler->conf->reboot == REBOOT_NONE) |
d39b10eb | 729 | lxc_list_init(&handler->conf->state_clients); |
fae349da | 730 | |
b6b2b194 WB |
731 | for (i = 0; i < LXC_NS_MAX; i++) |
732 | handler->nsfd[i] = -1; | |
733 | ||
f0ecc19d | 734 | handler->name = name; |
3bdf52d7 | 735 | |
80308d07 | 736 | if (daemonize && handler->conf->reboot == REBOOT_NONE) { |
5e5576a4 | 737 | /* Create socketpair() to synchronize on daemonized startup. |
fdecbc9c CB |
738 | * When the container reboots we don't need to synchronize |
739 | * again currently so don't open another socketpair(). | |
5e5576a4 CB |
740 | */ |
741 | ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, | |
742 | handler->state_socket_pair); | |
743 | if (ret < 0) { | |
744 | ERROR("Failed to create anonymous pair of unix sockets"); | |
745 | goto on_error; | |
746 | } | |
9044b79e | 747 | |
5e5576a4 CB |
748 | TRACE("Created anonymous pair {%d,%d} of unix sockets", |
749 | handler->state_socket_pair[0], | |
750 | handler->state_socket_pair[1]); | |
751 | } | |
752 | ||
80308d07 | 753 | if (handler->conf->reboot == REBOOT_NONE) { |
d39b10eb CB |
754 | handler->conf->maincmd_fd = lxc_cmd_init(name, lxcpath, "command"); |
755 | if (handler->conf->maincmd_fd < 0) { | |
756 | ERROR("Failed to set up command socket"); | |
757 | goto on_error; | |
758 | } | |
aa460476 | 759 | } |
9044b79e | 760 | |
9dfa4041 | 761 | TRACE("Unix domain socket %d for command server is ready", |
aa460476 CB |
762 | handler->conf->maincmd_fd); |
763 | ||
764 | return handler; | |
765 | ||
f2e07cb6 CB |
766 | on_error: |
767 | lxc_free_handler(handler); | |
aa460476 CB |
768 | |
769 | return NULL; | |
770 | } | |
771 | ||
772 | int lxc_init(const char *name, struct lxc_handler *handler) | |
773 | { | |
a2c09be0 | 774 | int ret; |
4a03ded4 | 775 | const char *loglevel; |
aa460476 CB |
776 | struct lxc_conf *conf = handler->conf; |
777 | ||
434c8e15 CB |
778 | handler->monitor_pid = lxc_raw_getpid(); |
779 | ||
aa460476 | 780 | lsm_init(); |
2170b263 | 781 | TRACE("Initialized LSM"); |
d2e30e99 | 782 | |
2170b263 CB |
783 | ret = lxc_read_seccomp_config(conf); |
784 | if (ret < 0) { | |
785 | ERROR("Failed loading seccomp policy"); | |
d2e30e99 | 786 | goto out_close_maincmd_fd; |
8f2c3a70 | 787 | } |
2170b263 | 788 | TRACE("Read seccomp policy"); |
8f2c3a70 | 789 | |
408da065 | 790 | /* Begin by setting the state to STARTING. */ |
2170b263 CB |
791 | ret = lxc_set_state(name, handler, STARTING); |
792 | if (ret < 0) { | |
793 | ERROR("Failed to set state to \"%s\"", lxc_state2str(STARTING)); | |
051151de | 794 | goto out_close_maincmd_fd; |
0ad19a3f | 795 | } |
46800e77 | 796 | TRACE("Set container state to \"STARTING\""); |
0ad19a3f | 797 | |
408da065 | 798 | /* Start of environment variable setup for hooks. */ |
24c2a48d CB |
799 | ret = setenv("LXC_NAME", name, 1); |
800 | if (ret < 0) | |
801 | SYSERROR("Failed to set environment variable: LXC_NAME=%s", name); | |
408da065 | 802 | |
2170b263 CB |
803 | if (conf->rcfile) { |
804 | ret = setenv("LXC_CONFIG_FILE", conf->rcfile, 1); | |
805 | if (ret < 0) | |
806 | SYSERROR("Failed to set environment variable: " | |
807 | "LXC_CONFIG_FILE=%s", conf->rcfile); | |
808 | } | |
408da065 | 809 | |
2170b263 CB |
810 | if (conf->rootfs.mount) { |
811 | ret = setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1); | |
812 | if (ret < 0) | |
813 | SYSERROR("Failed to set environment variable: " | |
814 | "LXC_ROOTFS_MOUNT=%s", conf->rootfs.mount); | |
815 | } | |
408da065 | 816 | |
2170b263 CB |
817 | if (conf->rootfs.path) { |
818 | ret = setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1); | |
819 | if (ret < 0) | |
820 | SYSERROR("Failed to set environment variable: " | |
821 | "LXC_ROOTFS_PATH=%s", conf->rootfs.path); | |
822 | } | |
408da065 | 823 | |
2170b263 CB |
824 | if (conf->console.path) { |
825 | ret = setenv("LXC_CONSOLE", conf->console.path, 1); | |
826 | if (ret < 0) | |
827 | SYSERROR("Failed to set environment variable: " | |
828 | "LXC_CONSOLE=%s", conf->console.path); | |
829 | } | |
408da065 | 830 | |
2170b263 CB |
831 | if (conf->console.log_path) { |
832 | ret = setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1); | |
833 | if (ret < 0) | |
834 | SYSERROR("Failed to set environment variable: " | |
835 | "LXC_CONSOLE_LOGPATH=%s", conf->console.log_path); | |
836 | } | |
408da065 | 837 | |
2170b263 CB |
838 | if (cgns_supported()) { |
839 | ret = setenv("LXC_CGNS_AWARE", "1", 1); | |
840 | if (ret < 0) | |
841 | SYSERROR("Failed to set environment variable " | |
842 | "LXC_CGNS_AWARE=1"); | |
843 | } | |
b8f88d9b | 844 | |
4a03ded4 | 845 | loglevel = lxc_log_priority_to_string(lxc_log_get_level()); |
2170b263 CB |
846 | ret = setenv("LXC_LOG_LEVEL", loglevel, 1); |
847 | if (ret < 0) | |
848 | SYSERROR("Set environment variable LXC_LOG_LEVEL=%s", | |
849 | loglevel); | |
a2c09be0 CB |
850 | |
851 | if (conf->hooks_version == 0) | |
852 | ret = setenv("LXC_HOOK_VERSION", "0", 1); | |
853 | else | |
854 | ret = setenv("LXC_HOOK_VERSION", "1", 1); | |
855 | if (ret < 0) | |
856 | SYSERROR("Failed to set environment variable LXC_HOOK_VERSION=%u", conf->hooks_version); | |
408da065 | 857 | /* End of environment variable setup for hooks. */ |
f7bee6c6 | 858 | |
2170b263 | 859 | TRACE("Set environment variables"); |
dbc9832d | 860 | |
2170b263 CB |
861 | ret = run_lxc_hooks(name, "pre-start", conf, NULL); |
862 | if (ret < 0) { | |
863 | ERROR("Failed to run lxc.hook.pre-start for container \"%s\"", name); | |
773fb9ca SH |
864 | goto out_aborting; |
865 | } | |
2170b263 | 866 | TRACE("Ran pre-start hooks"); |
26ddeedd | 867 | |
408da065 CB |
868 | /* The signal fd has to be created before forking otherwise if the child |
869 | * process exits before we setup the signal fd, the event will be lost | |
870 | * and the command will be stuck. | |
871 | */ | |
83ee7875 | 872 | handler->sigfd = setup_signal_fd(&handler->oldmask); |
59eb99ba | 873 | if (handler->sigfd < 0) { |
408da065 | 874 | ERROR("Failed to setup SIGCHLD fd handler."); |
b5159817 DE |
875 | goto out_delete_tty; |
876 | } | |
2170b263 | 877 | TRACE("Set up signal fd"); |
b5159817 | 878 | |
408da065 | 879 | /* Do this after setting up signals since it might unblock SIGWINCH. */ |
564e31c4 | 880 | ret = lxc_terminal_setup(conf); |
4d1ffb0a CB |
881 | if (ret < 0) { |
882 | ERROR("Failed to create console"); | |
b5159817 | 883 | goto out_restore_sigmask; |
b0a33c1e | 884 | } |
4d1ffb0a | 885 | TRACE("Created console"); |
b0a33c1e | 886 | |
2f835b4b | 887 | ret = lxc_terminal_map_ids(conf, &conf->console); |
7cfeddd7 | 888 | if (ret < 0) { |
2170b263 | 889 | ERROR("Failed to chown console"); |
5b74eb3c | 890 | goto out_delete_terminal; |
c4d10a05 | 891 | } |
2170b263 | 892 | TRACE("Chowned console"); |
c4d10a05 | 893 | |
5a087e05 | 894 | handler->cgroup_ops = cgroup_init(handler->conf); |
2202afc9 CB |
895 | if (!handler->cgroup_ops) { |
896 | ERROR("Failed to initialize cgroup driver"); | |
5b74eb3c | 897 | goto out_delete_terminal; |
2202afc9 CB |
898 | } |
899 | TRACE("Initialized cgroup driver"); | |
900 | ||
1800f924 WB |
901 | ret = lsm_process_prepare(conf, handler->lxcpath); |
902 | if (ret < 0) { | |
903 | ERROR("Failed to initialize LSM"); | |
904 | goto out_destroy_cgroups; | |
905 | } | |
906 | TRACE("Initialized LSM"); | |
907 | ||
2170b263 | 908 | INFO("Container \"%s\" is initialized", name); |
aa460476 | 909 | return 0; |
59eb99ba | 910 | |
1800f924 | 911 | out_destroy_cgroups: |
434c8e15 CB |
912 | handler->cgroup_ops->payload_destroy(handler->cgroup_ops, handler); |
913 | handler->cgroup_ops->monitor_destroy(handler->cgroup_ops, handler); | |
1800f924 | 914 | |
5b74eb3c CB |
915 | out_delete_terminal: |
916 | lxc_terminal_delete(&handler->conf->console); | |
ea918412 | 917 | |
b5159817 | 918 | out_restore_sigmask: |
4c496daa | 919 | (void)pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); |
ea918412 | 920 | |
59eb99ba | 921 | out_delete_tty: |
0e4be3cf | 922 | lxc_delete_tty(&conf->ttys); |
ea918412 | 923 | |
59eb99ba | 924 | out_aborting: |
4c496daa | 925 | (void)lxc_set_state(name, handler, ABORTING); |
ea918412 | 926 | |
d2e30e99 | 927 | out_close_maincmd_fd: |
9044b79e | 928 | lxc_abstract_unix_close(conf->maincmd_fd); |
d2e30e99 | 929 | conf->maincmd_fd = -1; |
aa460476 | 930 | return -1; |
59eb99ba DL |
931 | } |
932 | ||
3b72c4a0 | 933 | void lxc_fini(const char *name, struct lxc_handler *handler) |
59eb99ba | 934 | { |
c097467f | 935 | int i, ret; |
18b3b9c1 | 936 | pid_t self; |
dbc9832d | 937 | struct lxc_list *cur, *next; |
dbc9832d | 938 | char *namespaces[LXC_NS_MAX + 1]; |
b3286b62 | 939 | size_t namespace_count = 0; |
2202afc9 | 940 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b6b2b194 | 941 | |
408da065 CB |
942 | /* The STOPPING state is there for future cleanup code which can take |
943 | * awhile. | |
59eb99ba | 944 | */ |
25c2aca5 | 945 | lxc_set_state(name, handler, STOPPING); |
b6b2b194 | 946 | |
0059379f | 947 | self = lxc_raw_getpid(); |
b3286b62 | 948 | for (i = 0; i < LXC_NS_MAX; i++) { |
18b3b9c1 CB |
949 | if (handler->nsfd[i] < 0) |
950 | continue; | |
951 | ||
952 | if (handler->conf->hooks_version == 0) | |
c097467f | 953 | ret = asprintf(&namespaces[namespace_count], |
18b3b9c1 CB |
954 | "%s:/proc/%d/fd/%d", ns_info[i].proc_name, |
955 | self, handler->nsfd[i]); | |
956 | else | |
c097467f | 957 | ret = asprintf(&namespaces[namespace_count], |
18b3b9c1 | 958 | "/proc/%d/fd/%d", self, handler->nsfd[i]); |
c097467f CB |
959 | if (ret == -1) { |
960 | SYSERROR("Failed to allocate memory"); | |
18b3b9c1 | 961 | break; |
b3286b62 | 962 | } |
18b3b9c1 CB |
963 | |
964 | if (handler->conf->hooks_version == 0) { | |
965 | namespace_count++; | |
966 | continue; | |
967 | } | |
968 | ||
c097467f CB |
969 | ret = setenv(ns_info[i].env_name, namespaces[namespace_count], 1); |
970 | if (ret < 0) | |
18b3b9c1 CB |
971 | SYSERROR("Failed to set environment variable %s=%s", |
972 | ns_info[i].env_name, namespaces[namespace_count]); | |
973 | else | |
974 | TRACE("Set environment variable %s=%s", | |
975 | ns_info[i].env_name, namespaces[namespace_count]); | |
976 | ||
977 | namespace_count++; | |
b3286b62 WB |
978 | } |
979 | namespaces[namespace_count] = NULL; | |
c154af98 | 980 | |
80308d07 | 981 | if (handler->conf->reboot > REBOOT_NONE) { |
c097467f CB |
982 | ret = setenv("LXC_TARGET", "reboot", 1); |
983 | if (ret < 0) | |
984 | SYSERROR("Failed to set environment variable: " | |
985 | "LXC_TARGET=reboot"); | |
986 | } | |
408da065 | 987 | |
80308d07 | 988 | if (handler->conf->reboot == REBOOT_NONE) { |
c097467f CB |
989 | ret = setenv("LXC_TARGET", "stop", 1); |
990 | if (ret < 0) | |
991 | SYSERROR("Failed to set environment variable: " | |
992 | "LXC_TARGET=stop"); | |
993 | } | |
c154af98 | 994 | |
18b3b9c1 | 995 | if (handler->conf->hooks_version == 0) |
c097467f | 996 | ret = run_lxc_hooks(name, "stop", handler->conf, namespaces); |
18b3b9c1 | 997 | else |
c097467f CB |
998 | ret = run_lxc_hooks(name, "stop", handler->conf, NULL); |
999 | if (ret < 0) | |
1000 | ERROR("Failed to run \"lxc.hook.stop\" hook"); | |
c154af98 | 1001 | |
b3286b62 WB |
1002 | while (namespace_count--) |
1003 | free(namespaces[namespace_count]); | |
28d9e29e | 1004 | |
1800f924 WB |
1005 | lsm_process_cleanup(handler->conf, handler->lxcpath); |
1006 | ||
434c8e15 CB |
1007 | cgroup_ops->payload_destroy(cgroup_ops, handler); |
1008 | cgroup_ops->monitor_destroy(cgroup_ops, handler); | |
4288b79f | 1009 | |
80308d07 | 1010 | if (handler->conf->reboot == REBOOT_NONE) { |
f893d898 CB |
1011 | /* For all new state clients simply close the command socket. |
1012 | * This will inform all state clients that the container is | |
1013 | * STOPPED and also prevents a race between a open()/close() on | |
1014 | * the command socket causing a new process to get ECONNREFUSED | |
1015 | * because we haven't yet closed the command socket. | |
1016 | */ | |
9044b79e | 1017 | lxc_abstract_unix_close(handler->conf->maincmd_fd); |
d39b10eb | 1018 | handler->conf->maincmd_fd = -1; |
c3184275 CB |
1019 | TRACE("Closed command socket"); |
1020 | ||
1021 | /* This function will try to connect to the legacy lxc-monitord | |
1022 | * state server and only exists for backwards compatibility. | |
1023 | */ | |
1024 | lxc_monitor_send_state(name, STOPPED, handler->lxcpath); | |
1025 | ||
1026 | /* The command socket is closed so no one can acces the command | |
1027 | * socket anymore so there's no need to lock it. | |
1028 | */ | |
1029 | handler->state = STOPPED; | |
1030 | TRACE("Set container state to \"STOPPED\""); | |
f893d898 CB |
1031 | } else { |
1032 | lxc_set_state(name, handler, STOPPED); | |
d39b10eb | 1033 | } |
4288b79f | 1034 | |
048493a3 CB |
1035 | /* Avoid lingering namespace references. */ |
1036 | lxc_put_nsfds(handler); | |
1037 | ||
46800e77 CB |
1038 | ret = run_lxc_hooks(name, "post-stop", handler->conf, NULL); |
1039 | if (ret < 0) { | |
c097467f | 1040 | ERROR("Failed to run lxc.hook.post-stop for container \"%s\"", name); |
80308d07 | 1041 | if (handler->conf->reboot > REBOOT_NONE) { |
c097467f | 1042 | WARN("Container will be stopped instead of rebooted"); |
80308d07 | 1043 | handler->conf->reboot = REBOOT_NONE; |
c097467f CB |
1044 | |
1045 | ret = setenv("LXC_TARGET", "stop", 1); | |
1046 | if (ret < 0) | |
1047 | WARN("Failed to set environment variable: " | |
1048 | "LXC_TARGET=stop"); | |
f3787121 CB |
1049 | } |
1050 | } | |
26ddeedd | 1051 | |
408da065 | 1052 | /* Reset mask set by setup_signal_fd. */ |
b467714b | 1053 | ret = pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); |
c097467f | 1054 | if (ret < 0) |
a24c5678 | 1055 | SYSWARN("Failed to restore signal mask"); |
8f64a3f6 | 1056 | |
2aac071b | 1057 | lxc_terminal_delete(&handler->conf->console); |
0e4be3cf | 1058 | lxc_delete_tty(&handler->conf->ttys); |
dbc9832d | 1059 | |
dbc9832d CB |
1060 | /* The command socket is now closed, no more state clients can register |
1061 | * themselves from now on. So free the list of state clients. | |
1062 | */ | |
d39b10eb CB |
1063 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
1064 | struct lxc_state_client *client = cur->elem; | |
1065 | ||
1066 | /* Keep state clients that want to be notified about reboots. */ | |
80308d07 CB |
1067 | if ((handler->conf->reboot > REBOOT_NONE) && |
1068 | (client->states[RUNNING] == 2)) | |
d39b10eb CB |
1069 | continue; |
1070 | ||
dbc9832d | 1071 | /* close state client socket */ |
dbc9832d | 1072 | lxc_list_del(cur); |
c097467f | 1073 | close(client->clientfd); |
dbc9832d CB |
1074 | free(cur->elem); |
1075 | free(cur); | |
1076 | } | |
1077 | ||
80308d07 | 1078 | if (handler->conf->ephemeral == 1 && handler->conf->reboot != REBOOT_REQ) |
28272964 | 1079 | lxc_destroy_container_on_signal(handler, name); |
2c5f2ede | 1080 | |
1cc8bd4b | 1081 | lxc_free_handler(handler); |
59eb99ba DL |
1082 | } |
1083 | ||
735f2c6e | 1084 | void lxc_abort(const char *name, struct lxc_handler *handler) |
59eb99ba | 1085 | { |
73e608b2 SH |
1086 | int ret, status; |
1087 | ||
25c2aca5 | 1088 | lxc_set_state(name, handler, ABORTING); |
0e4f9d51 CB |
1089 | |
1090 | if (handler->pid > 0) { | |
1091 | ret = kill(handler->pid, SIGKILL); | |
1092 | if (ret < 0) | |
1093 | SYSERROR("Failed to send SIGKILL to %d", handler->pid); | |
1094 | } | |
1095 | ||
408da065 CB |
1096 | while ((ret = waitpid(-1, &status, 0)) > 0) { |
1097 | ; | |
1098 | } | |
59eb99ba DL |
1099 | } |
1100 | ||
ffe1e01a | 1101 | static int do_start(void *data) |
50e98013 | 1102 | { |
cdb2a47f | 1103 | struct lxc_handler *handler = data; |
eab649dc CB |
1104 | ATTR_UNUSED __do_close_prot_errno int data_sock0 = handler->data_sock[0], |
1105 | data_sock1 = handler->data_sock[1]; | |
8bf3abfb | 1106 | int ret; |
7a55c157 | 1107 | char path[PATH_MAX]; |
928b1f04 YT |
1108 | uid_t new_uid; |
1109 | gid_t new_gid; | |
e96a536c | 1110 | struct lxc_list *iterator; |
964581c2 CB |
1111 | uid_t nsuid = 0; |
1112 | gid_t nsgid = 0; | |
5af9369b | 1113 | int devnull_fd = -1; |
50e98013 | 1114 | |
18225d19 | 1115 | lxc_sync_fini_parent(handler); |
50e98013 | 1116 | |
408da065 CB |
1117 | /* This prctl must be before the synchro, so if the parent dies before |
1118 | * we set the parent death signal, we will detect its death with the | |
1119 | * synchro right after, otherwise we have a window where the parent can | |
1120 | * exit before we set the pdeath signal leading to a unsupervized | |
1121 | * container. | |
743ecd2e | 1122 | */ |
b765aa88 | 1123 | ret = lxc_set_death_signal(SIGKILL, handler->monitor_pid); |
912314fc CB |
1124 | if (ret < 0) { |
1125 | SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL"); | |
18225d19 | 1126 | goto out_warn_father; |
743ecd2e DL |
1127 | } |
1128 | ||
611ddd34 CB |
1129 | ret = lxc_ambient_caps_up(); |
1130 | if (ret < 0) { | |
6f5e532f | 1131 | ERROR("Failed to raise ambient capabilities"); |
611ddd34 CB |
1132 | goto out_warn_father; |
1133 | } | |
1134 | ||
b467714b | 1135 | ret = pthread_sigmask(SIG_SETMASK, &handler->oldmask, NULL); |
18225d19 CB |
1136 | if (ret < 0) { |
1137 | SYSERROR("Failed to set signal mask"); | |
1138 | goto out_warn_father; | |
1139 | } | |
50e98013 | 1140 | |
408da065 | 1141 | /* Don't leak the pinfd to the container. */ |
d39b10eb | 1142 | if (handler->pinfd >= 0) |
0d03360a | 1143 | close(handler->pinfd); |
2b0e17e4 | 1144 | |
18225d19 CB |
1145 | ret = lxc_sync_wait_parent(handler, LXC_SYNC_STARTUP); |
1146 | if (ret < 0) | |
1147 | goto out_warn_father; | |
5b1e83cb | 1148 | |
408da065 CB |
1149 | /* Unshare CLONE_NEWNET after CLONE_NEWUSER. See |
1150 | * https://github.com/lxc/lxd/issues/1978. | |
1151 | */ | |
becad0ec | 1152 | if ((handler->ns_clone_flags & (CLONE_NEWNET | CLONE_NEWUSER)) == |
408da065 | 1153 | (CLONE_NEWNET | CLONE_NEWUSER)) { |
5b1e83cb SH |
1154 | ret = unshare(CLONE_NEWNET); |
1155 | if (ret < 0) { | |
e96a536c | 1156 | SYSERROR("Failed to unshare CLONE_NEWNET"); |
5b1e83cb SH |
1157 | goto out_warn_father; |
1158 | } | |
e96a536c | 1159 | INFO("Unshared CLONE_NEWNET"); |
5b1e83cb SH |
1160 | } |
1161 | ||
408da065 CB |
1162 | /* Tell the parent task it can begin to configure the container and wait |
1163 | * for it to finish. | |
3c22086f | 1164 | */ |
e96a536c CB |
1165 | ret = lxc_sync_barrier_parent(handler, LXC_SYNC_CONFIGURE); |
1166 | if (ret < 0) | |
611ddd34 | 1167 | goto out_error; |
50e98013 | 1168 | |
e96a536c CB |
1169 | ret = lxc_network_recv_veth_names_from_parent(handler); |
1170 | if (ret < 0) { | |
7ab1ba02 | 1171 | ERROR("Failed to receive veth names from parent"); |
658979c5 | 1172 | goto out_warn_father; |
7ab1ba02 | 1173 | } |
658979c5 | 1174 | |
408da065 | 1175 | /* If we are in a new user namespace, become root there to have |
d08f8d2f | 1176 | * privilege over our namespace. |
f6d3e3e4 SH |
1177 | */ |
1178 | if (!lxc_list_empty(&handler->conf->id_map)) { | |
964581c2 CB |
1179 | if (!handler->conf->root_nsuid_map) |
1180 | nsuid = handler->conf->init_uid; | |
1181 | ||
1182 | if (!handler->conf->root_nsgid_map) | |
1183 | nsgid = handler->conf->init_gid; | |
4160c3a0 | 1184 | |
464c4611 | 1185 | if (!lxc_switch_uid_gid(nsuid, nsgid)) |
f6d3e3e4 | 1186 | goto out_warn_father; |
d08f8d2f CB |
1187 | |
1188 | /* Drop groups only after we switched to a valid gid in the new | |
1189 | * user namespace. | |
1190 | */ | |
8af07f82 CB |
1191 | if (!lxc_setgroups(0, NULL) && |
1192 | (handler->am_root || errno != EPERM)) | |
c476bdce | 1193 | goto out_warn_father; |
4b826b1f | 1194 | |
b81689a1 CB |
1195 | ret = prctl(PR_SET_DUMPABLE, prctl_arg(1), prctl_arg(0), |
1196 | prctl_arg(0), prctl_arg(0)); | |
d7883725 CB |
1197 | if (ret < 0) |
1198 | goto out_warn_father; | |
912314fc CB |
1199 | |
1200 | /* set{g,u}id() clears deathsignal */ | |
f08a5cc4 | 1201 | ret = lxc_set_death_signal(SIGKILL, handler->monitor_pid); |
912314fc CB |
1202 | if (ret < 0) { |
1203 | SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL"); | |
1204 | goto out_warn_father; | |
1205 | } | |
f6d3e3e4 SH |
1206 | } |
1207 | ||
e96a536c CB |
1208 | ret = access(handler->lxcpath, X_OK); |
1209 | if (ret != 0) { | |
c8154066 SH |
1210 | print_top_failing_dir(handler->lxcpath); |
1211 | goto out_warn_father; | |
1212 | } | |
1213 | ||
e96a536c CB |
1214 | ret = snprintf(path, sizeof(path), "%s/dev/null", |
1215 | handler->conf->rootfs.mount); | |
408da065 | 1216 | if (ret < 0 || ret >= sizeof(path)) |
7a55c157 | 1217 | goto out_warn_father; |
7a55c157 TA |
1218 | |
1219 | /* In order to checkpoint restore, we need to have everything in the | |
1220 | * same mount namespace. However, some containers may not have a | |
1221 | * reasonable /dev (in particular, they may not have /dev/null), so we | |
1222 | * can't set init's std fds to /dev/null by opening it from inside the | |
1223 | * container. | |
1224 | * | |
1225 | * If that's the case, fall back to using the host's /dev/null. This | |
1226 | * means that migration won't work, but at least we won't spew output | |
1227 | * where it isn't wanted. | |
1228 | */ | |
bb955810 | 1229 | if (handler->daemonize && !handler->conf->autodev) { |
e96a536c CB |
1230 | ret = access(path, F_OK); |
1231 | if (ret != 0) { | |
1232 | devnull_fd = open_devnull(); | |
c44de748 | 1233 | |
e96a536c CB |
1234 | if (devnull_fd < 0) |
1235 | goto out_warn_father; | |
1236 | WARN("Using /dev/null from the host for container " | |
1237 | "init's standard file descriptors. Migration will " | |
1238 | "not work"); | |
1239 | } | |
c44de748 AM |
1240 | } |
1241 | ||
408da065 | 1242 | /* Ask father to setup cgroups and wait for him to finish. */ |
e96a536c CB |
1243 | ret = lxc_sync_barrier_parent(handler, LXC_SYNC_CGROUP); |
1244 | if (ret < 0) | |
c44de748 | 1245 | goto out_error; |
544a48a0 | 1246 | |
deefdf8a CB |
1247 | /* Unshare cgroup namespace after we have setup our cgroups. If we do it |
1248 | * earlier we end up with a wrong view of /proc/self/cgroup. For | |
1249 | * example, assume we unshare(CLONE_NEWCGROUP) first, and then create | |
1250 | * the cgroup for the container, say /sys/fs/cgroup/cpuset/lxc/c, then | |
1251 | * /proc/self/cgroup would show us: | |
1252 | * | |
1253 | * 8:cpuset:/lxc/c | |
1254 | * | |
1255 | * whereas it should actually show | |
1256 | * | |
1257 | * 8:cpuset:/ | |
1258 | */ | |
becad0ec | 1259 | if (handler->ns_clone_flags & CLONE_NEWCGROUP) { |
e96a536c CB |
1260 | ret = unshare(CLONE_NEWCGROUP); |
1261 | if (ret < 0) { | |
bca7c59c CB |
1262 | if (errno != EINVAL) { |
1263 | SYSERROR("Failed to unshare CLONE_NEWCGROUP"); | |
1264 | goto out_warn_father; | |
1265 | } | |
1266 | ||
1267 | handler->ns_clone_flags &= ~CLONE_NEWCGROUP; | |
1268 | SYSINFO("Kernel does not support CLONE_NEWCGROUP"); | |
1269 | } else { | |
1270 | INFO("Unshared CLONE_NEWCGROUP"); | |
deefdf8a | 1271 | } |
deefdf8a CB |
1272 | } |
1273 | ||
149857af CB |
1274 | /* Add the requested environment variables to the current environment to |
1275 | * allow them to be used by the various hooks, such as the start hook | |
1276 | * above. | |
98ff08ca | 1277 | */ |
98ff08ca | 1278 | lxc_list_for_each(iterator, &handler->conf->environment) { |
e96a536c CB |
1279 | ret = putenv((char *)iterator->elem); |
1280 | if (ret < 0) { | |
1281 | SYSERROR("Failed to set environment variable: %s", | |
1282 | (char *)iterator->elem); | |
98ff08ca CB |
1283 | goto out_warn_father; |
1284 | } | |
1285 | } | |
1286 | ||
f4152036 | 1287 | /* Setup the container, ip, names, utsname, ... */ |
3b988b33 | 1288 | ret = lxc_setup(handler); |
7729f8e5 | 1289 | if (ret < 0) { |
e96a536c | 1290 | ERROR("Failed to setup container \"%s\"", handler->name); |
f4152036 CB |
1291 | goto out_warn_father; |
1292 | } | |
1293 | ||
408da065 | 1294 | /* Set the label to change to when we exec(2) the container's init. */ |
1800f924 | 1295 | ret = lsm_process_label_set(NULL, handler->conf, true); |
e96a536c | 1296 | if (ret < 0) |
e075f5d9 | 1297 | goto out_warn_father; |
5112cd70 | 1298 | |
029cdff5 | 1299 | /* Set PR_SET_NO_NEW_PRIVS after we changed the lsm label. If we do it |
408da065 CB |
1300 | * before we aren't allowed anymore. |
1301 | */ | |
029cdff5 | 1302 | if (handler->conf->no_new_privs) { |
b81689a1 CB |
1303 | ret = prctl(PR_SET_NO_NEW_PRIVS, prctl_arg(1), prctl_arg(0), |
1304 | prctl_arg(0), prctl_arg(0)); | |
e96a536c CB |
1305 | if (ret < 0) { |
1306 | SYSERROR("Could not set PR_SET_NO_NEW_PRIVS to block " | |
1307 | "execve() gainable privileges"); | |
029cdff5 CB |
1308 | goto out_warn_father; |
1309 | } | |
e96a536c CB |
1310 | DEBUG("Set PR_SET_NO_NEW_PRIVS to block execve() gainable " |
1311 | "privileges"); | |
029cdff5 CB |
1312 | } |
1313 | ||
0d9acb99 DE |
1314 | /* Some init's such as busybox will set sane tty settings on stdin, |
1315 | * stdout, stderr which it thinks is the console. We already set them | |
1316 | * the way we wanted on the real terminal, and we want init to do its | |
564e31c4 | 1317 | * setup on its console ie. the pty allocated in lxc_terminal_setup() so |
408da065 | 1318 | * make sure that that pty is stdin,stdout,stderr. |
0d9acb99 | 1319 | */ |
5d113f65 | 1320 | if (handler->conf->console.slave >= 0) { |
bb955810 | 1321 | if (handler->daemonize || !handler->conf->is_execute) |
5d113f65 CB |
1322 | ret = set_stdfds(handler->conf->console.slave); |
1323 | else | |
ae6d3913 | 1324 | ret = lxc_terminal_set_stdfds(handler->conf->console.slave); |
5d113f65 | 1325 | if (ret < 0) { |
c5b93afb | 1326 | ERROR("Failed to redirect std{in,out,err} to pty file " |
e96a536c | 1327 | "descriptor %d", handler->conf->console.slave); |
c5b93afb LF |
1328 | goto out_warn_father; |
1329 | } | |
5d113f65 | 1330 | } |
0d9acb99 | 1331 | |
408da065 | 1332 | /* If we mounted a temporary proc, then unmount it now. */ |
5112cd70 | 1333 | tmp_proc_unmount(handler->conf); |
e075f5d9 | 1334 | |
e96a536c CB |
1335 | ret = lxc_seccomp_load(handler->conf); |
1336 | if (ret < 0) | |
8f2c3a70 SH |
1337 | goto out_warn_father; |
1338 | ||
c3e3c21a CB |
1339 | ret = lxc_seccomp_send_notifier_fd(&handler->conf->seccomp, data_sock0); |
1340 | if (ret < 0) { | |
1341 | SYSERROR("Failed to send seccomp notify fd to parent"); | |
1342 | goto out_warn_father; | |
cdb2a47f | 1343 | } |
cdb2a47f | 1344 | |
e96a536c CB |
1345 | ret = run_lxc_hooks(handler->name, "start", handler->conf, NULL); |
1346 | if (ret < 0) { | |
1347 | ERROR("Failed to run lxc.hook.start for container \"%s\"", | |
1348 | handler->name); | |
773fb9ca SH |
1349 | goto out_warn_father; |
1350 | } | |
fc25b815 | 1351 | |
773fb9ca | 1352 | close(handler->sigfd); |
26ddeedd | 1353 | |
bb955810 | 1354 | if (handler->conf->console.slave < 0 && handler->daemonize) { |
f4c177c3 CB |
1355 | if (devnull_fd < 0) { |
1356 | devnull_fd = open_devnull(); | |
1357 | if (devnull_fd < 0) | |
1358 | goto out_warn_father; | |
1359 | } | |
1360 | ||
e96a536c CB |
1361 | ret = set_stdfds(devnull_fd); |
1362 | if (ret < 0) { | |
1363 | ERROR("Failed to redirect std{in,out,err} to \"/dev/null\""); | |
c5b93afb LF |
1364 | goto out_warn_father; |
1365 | } | |
e96a536c | 1366 | } |
507cee36 | 1367 | |
c44de748 AM |
1368 | if (devnull_fd >= 0) { |
1369 | close(devnull_fd); | |
1370 | devnull_fd = -1; | |
1371 | } | |
1372 | ||
8c9a7665 TA |
1373 | setsid(); |
1374 | ||
e96a536c CB |
1375 | if (handler->conf->init_cwd) { |
1376 | ret = chdir(handler->conf->init_cwd); | |
1377 | if (ret < 0) { | |
1378 | SYSERROR("Could not change directory to \"%s\"", | |
1379 | handler->conf->init_cwd); | |
1380 | goto out_warn_father; | |
1381 | } | |
3c491553 L |
1382 | } |
1383 | ||
e96a536c CB |
1384 | ret = lxc_sync_barrier_parent(handler, LXC_SYNC_CGROUP_LIMITS); |
1385 | if (ret < 0) | |
f4152036 CB |
1386 | goto out_warn_father; |
1387 | ||
149857af CB |
1388 | /* Reset the environment variables the user requested in a clear |
1389 | * environment. | |
1390 | */ | |
e96a536c CB |
1391 | ret = clearenv(); |
1392 | /* Don't error out though. */ | |
1393 | if (ret < 0) | |
149857af | 1394 | SYSERROR("Failed to clear environment."); |
149857af CB |
1395 | |
1396 | lxc_list_for_each(iterator, &handler->conf->environment) { | |
e96a536c CB |
1397 | ret = putenv((char *)iterator->elem); |
1398 | if (ret < 0) { | |
1399 | SYSERROR("Failed to set environment variable: %s", | |
1400 | (char *)iterator->elem); | |
149857af CB |
1401 | goto out_warn_father; |
1402 | } | |
1403 | } | |
1404 | ||
e96a536c CB |
1405 | ret = putenv("container=lxc"); |
1406 | if (ret < 0) { | |
1407 | SYSERROR("Failed to set environment variable: container=lxc"); | |
98ff08ca CB |
1408 | goto out_warn_father; |
1409 | } | |
1410 | ||
885766f5 CB |
1411 | if (handler->conf->ttys.tty_names) { |
1412 | ret = putenv(handler->conf->ttys.tty_names); | |
e96a536c CB |
1413 | if (ret < 0) { |
1414 | SYSERROR("Failed to set environment variable for container ptys"); | |
98ff08ca CB |
1415 | goto out_warn_father; |
1416 | } | |
1417 | } | |
1418 | ||
76bdf299 CB |
1419 | /* The container has been setup. We can now switch to an unprivileged |
1420 | * uid/gid. | |
1421 | */ | |
928b1f04 YT |
1422 | new_uid = handler->conf->init_uid; |
1423 | new_gid = handler->conf->init_gid; | |
76bdf299 | 1424 | |
964581c2 CB |
1425 | /* Avoid unnecessary syscalls. */ |
1426 | if (new_uid == nsuid) | |
1427 | new_uid = LXC_INVALID_UID; | |
1428 | ||
1429 | if (new_gid == nsgid) | |
1430 | new_gid = LXC_INVALID_GID; | |
1431 | ||
464c4611 | 1432 | if (!lxc_switch_uid_gid(new_uid, new_gid)) |
928b1f04 YT |
1433 | goto out_warn_father; |
1434 | ||
8af07f82 CB |
1435 | /* If we are in a new user namespace we already dropped all groups when |
1436 | * we switched to root in the new user namespace further above. Only | |
1437 | * drop groups if we can, so ensure that we have necessary privilege. | |
1438 | */ | |
1439 | if (lxc_list_empty(&handler->conf->id_map)) | |
1440 | #if HAVE_LIBCAP | |
1441 | if (lxc_proc_cap_is_set(CAP_SETGID, CAP_EFFECTIVE)) | |
1442 | #endif | |
1443 | if (!lxc_setgroups(0, NULL)) | |
1444 | goto out_warn_father; | |
1445 | ||
611ddd34 CB |
1446 | ret = lxc_ambient_caps_down(); |
1447 | if (ret < 0) { | |
6f5e532f | 1448 | ERROR("Failed to clear ambient capabilities"); |
611ddd34 CB |
1449 | goto out_warn_father; |
1450 | } | |
1451 | ||
258f8051 | 1452 | if (handler->conf->monitor_signal_pdeath != SIGKILL) { |
97d8f4b7 | 1453 | ret = lxc_set_death_signal(handler->conf->monitor_signal_pdeath, handler->monitor_pid); |
258f8051 CB |
1454 | if (ret < 0) { |
1455 | SYSERROR("Failed to set PR_SET_PDEATHSIG to %d", | |
1456 | handler->conf->monitor_signal_pdeath); | |
1457 | goto out_warn_father; | |
1458 | } | |
1459 | } | |
1460 | ||
408da065 CB |
1461 | /* After this call, we are in error because this ops should not return |
1462 | * as it execs. | |
1463 | */ | |
c4ea60df | 1464 | handler->ops->start(handler, handler->data); |
50e98013 DL |
1465 | |
1466 | out_warn_father: | |
408da065 CB |
1467 | /* We want the parent to know something went wrong, so we return a |
1468 | * special error code. | |
1469 | */ | |
d1ccb562 | 1470 | lxc_sync_wake_parent(handler, LXC_SYNC_ERROR); |
c44de748 AM |
1471 | |
1472 | out_error: | |
1473 | if (devnull_fd >= 0) | |
1474 | close(devnull_fd); | |
1475 | ||
50e98013 DL |
1476 | return -1; |
1477 | } | |
1478 | ||
ae467c54 | 1479 | static int lxc_recv_ttys_from_child(struct lxc_handler *handler) |
e8bd4e43 | 1480 | { |
ae467c54 | 1481 | int i; |
2520facd | 1482 | struct lxc_terminal_info *tty; |
ae467c54 | 1483 | int ret = -1; |
c6012571 | 1484 | int sock = handler->data_sock[1]; |
e8bd4e43 | 1485 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1486 | struct lxc_tty_info *ttys = &conf->ttys; |
e8bd4e43 | 1487 | |
885766f5 | 1488 | if (!conf->ttys.max) |
e8bd4e43 SH |
1489 | return 0; |
1490 | ||
885766f5 | 1491 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 1492 | if (!ttys->tty) |
e8bd4e43 | 1493 | return -1; |
e8bd4e43 | 1494 | |
885766f5 | 1495 | for (i = 0; i < conf->ttys.max; i++) { |
672c1e58 CB |
1496 | int ttyfds[2]; |
1497 | ||
1498 | ret = lxc_abstract_unix_recv_fds(sock, ttyfds, 2, NULL, 0); | |
1499 | if (ret < 0) | |
1500 | break; | |
ae467c54 | 1501 | |
0e4be3cf | 1502 | tty = &ttys->tty[i]; |
2520facd CB |
1503 | tty->busy = 0; |
1504 | tty->master = ttyfds[0]; | |
1505 | tty->slave = ttyfds[1]; | |
672c1e58 | 1506 | TRACE("Received pty with master fd %d and slave fd %d from " |
2520facd | 1507 | "parent", tty->master, tty->slave); |
e8bd4e43 | 1508 | } |
6d1400b5 | 1509 | |
ae467c54 | 1510 | if (ret < 0) |
6d1400b5 | 1511 | SYSERROR("Failed to receive %zu ttys from child", ttys->max); |
ae467c54 | 1512 | else |
885766f5 | 1513 | TRACE("Received %zu ttys from child", ttys->max); |
ae467c54 CB |
1514 | |
1515 | return ret; | |
e8bd4e43 SH |
1516 | } |
1517 | ||
5af9369b | 1518 | int resolve_clone_flags(struct lxc_handler *handler) |
f813849c | 1519 | { |
8bc8c715 CB |
1520 | int i; |
1521 | struct lxc_conf *conf = handler->conf; | |
f813849c | 1522 | |
8bc8c715 | 1523 | for (i = 0; i < LXC_NS_MAX; i++) { |
f7a0c6ee CB |
1524 | if (conf->ns_keep) { |
1525 | if (!(conf->ns_keep & ns_info[i].clone_flag)) | |
becad0ec | 1526 | handler->ns_clone_flags |= ns_info[i].clone_flag; |
f7a0c6ee CB |
1527 | } else if (conf->ns_clone) { |
1528 | if ((conf->ns_clone & ns_info[i].clone_flag)) | |
becad0ec | 1529 | handler->ns_clone_flags |= ns_info[i].clone_flag; |
8bc8c715 CB |
1530 | } else { |
1531 | if (i == LXC_NS_USER && lxc_list_empty(&handler->conf->id_map)) | |
1532 | continue; | |
1533 | ||
1534 | if (i == LXC_NS_NET && lxc_requests_empty_network(handler)) | |
1535 | continue; | |
1536 | ||
7bd05339 CB |
1537 | if (i == LXC_NS_CGROUP && !cgns_supported()) |
1538 | continue; | |
1539 | ||
becad0ec | 1540 | handler->ns_clone_flags |= ns_info[i].clone_flag; |
8bc8c715 | 1541 | } |
03df7ab5 | 1542 | |
8bc8c715 CB |
1543 | if (!conf->ns_share[i]) |
1544 | continue; | |
5af9369b | 1545 | |
becad0ec | 1546 | handler->ns_clone_flags &= ~ns_info[i].clone_flag; |
8bc8c715 | 1547 | TRACE("Sharing %s namespace", ns_info[i].proc_name); |
5af9369b CB |
1548 | } |
1549 | ||
1550 | return 0; | |
f813849c TA |
1551 | } |
1552 | ||
8deca6c9 CB |
1553 | /* Note that this function is used with clone(CLONE_VM). Some glibc versions |
1554 | * used to reset the pid/tid to -1 when CLONE_VM was used without CLONE_THREAD. | |
1555 | * But since the memory between parent and child is shared on CLONE_VM this | |
1556 | * would invalidate the getpid() cache that glibc used to maintain and so | |
1557 | * getpid() in the child would return the parent's pid. This is all fixed in | |
1558 | * newer glibc versions where the getpid() cache is removed and the pid/tid is | |
1559 | * not reset anymore. | |
b35ddc5b | 1560 | * However, if for whatever reason you - dear committer - somehow need to get the |
8deca6c9 | 1561 | * pid of the dummy intermediate process for do_share_ns() you need to call |
0059379f CB |
1562 | * lxc_raw_getpid(). The next lxc_raw_clone() call does not employ CLONE_VM and |
1563 | * will be fine. | |
8deca6c9 CB |
1564 | */ |
1565 | static inline int do_share_ns(void *arg) | |
fa3a5b22 | 1566 | { |
8deca6c9 | 1567 | int i, flags, ret; |
fa3a5b22 CB |
1568 | struct lxc_handler *handler = arg; |
1569 | ||
8deca6c9 CB |
1570 | for (i = 0; i < LXC_NS_MAX; i++) { |
1571 | if (handler->nsfd[i] < 0) | |
1572 | continue; | |
fa3a5b22 | 1573 | |
8deca6c9 | 1574 | ret = setns(handler->nsfd[i], 0); |
c0b48eff CB |
1575 | if (ret < 0) { |
1576 | /* | |
1577 | * Note that joining a user and/or mount namespace | |
1578 | * requires the process is not multithreaded otherwise | |
1579 | * setns() will fail here. | |
1580 | */ | |
1581 | SYSERROR("Failed to inherit %s namespace", | |
1582 | ns_info[i].proc_name); | |
8deca6c9 | 1583 | return -1; |
c0b48eff | 1584 | } |
fa3a5b22 | 1585 | |
8deca6c9 | 1586 | DEBUG("Inherited %s namespace", ns_info[i].proc_name); |
fa3a5b22 CB |
1587 | } |
1588 | ||
becad0ec | 1589 | flags = handler->ns_on_clone_flags; |
8deca6c9 | 1590 | flags |= CLONE_PARENT; |
ac2ba696 | 1591 | handler->pid = lxc_raw_clone_cb(do_start, handler, flags); |
8deca6c9 | 1592 | if (handler->pid < 0) |
fa3a5b22 CB |
1593 | return -1; |
1594 | ||
8deca6c9 | 1595 | return 0; |
fa3a5b22 CB |
1596 | } |
1597 | ||
480588e6 CB |
1598 | /* lxc_spawn() performs crucial setup tasks and clone()s the new process which |
1599 | * exec()s the requested container binary. | |
1600 | * Note that lxc_spawn() runs in the parent namespaces. Any operations performed | |
1601 | * right here should be double checked if they'd pose a security risk. (For | |
1602 | * example, any {u}mount() operations performed here will be reflected on the | |
1603 | * host!) | |
1604 | */ | |
74a3920a | 1605 | static int lxc_spawn(struct lxc_handler *handler) |
59eb99ba | 1606 | { |
cdb2a47f | 1607 | __do_close_prot_errno int data_sock0 = -EBADF, data_sock1 = -EBADF; |
8deca6c9 | 1608 | int i, ret; |
08dd2805 | 1609 | char pidstr[20]; |
57927bf2 CB |
1610 | bool wants_to_map_ids; |
1611 | struct lxc_list *id_map; | |
6e5fc7a5 | 1612 | const char *name = handler->name; |
28d9e29e | 1613 | const char *lxcpath = handler->lxcpath; |
2202afc9 | 1614 | bool share_ns = false; |
28d9e29e | 1615 | struct lxc_conf *conf = handler->conf; |
2202afc9 | 1616 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
9f30a190 | 1617 | |
28d9e29e | 1618 | id_map = &conf->id_map; |
57927bf2 | 1619 | wants_to_map_ids = !lxc_list_empty(id_map); |
2f2623ec | 1620 | |
28d9e29e | 1621 | for (i = 0; i < LXC_NS_MAX; i++) { |
b074bbf1 | 1622 | if (!conf->ns_share[i]) |
28d9e29e CB |
1623 | continue; |
1624 | ||
b074bbf1 | 1625 | handler->nsfd[i] = lxc_inherit_namespace(conf->ns_share[i], lxcpath, ns_info[i].proc_name); |
28d9e29e CB |
1626 | if (handler->nsfd[i] < 0) |
1627 | return -1; | |
fa3a5b22 | 1628 | |
8deca6c9 | 1629 | share_ns = true; |
28d9e29e | 1630 | } |
50e98013 | 1631 | |
cfc62c60 CB |
1632 | ret = lxc_sync_init(handler); |
1633 | if (ret < 0) | |
9d7f9e52 | 1634 | return -1; |
0ad19a3f | 1635 | |
b9f522c5 | 1636 | ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, |
790255cf | 1637 | handler->data_sock); |
95ef0d7c CB |
1638 | if (ret < 0) |
1639 | goto out_sync_fini; | |
cdb2a47f CB |
1640 | data_sock0 = handler->data_sock[0]; |
1641 | data_sock1 = handler->data_sock[1]; | |
e8bd4e43 | 1642 | |
5af9369b | 1643 | ret = resolve_clone_flags(handler); |
95ef0d7c CB |
1644 | if (ret < 0) |
1645 | goto out_sync_fini; | |
9f30a190 | 1646 | |
becad0ec | 1647 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
28d9e29e | 1648 | if (!lxc_list_empty(&conf->network)) { |
26b797f3 | 1649 | |
9f30a190 MM |
1650 | /* Find gateway addresses from the link device, which is |
1651 | * no longer accessible inside the container. Do this | |
1652 | * before creating network interfaces, since goto | |
408da065 CB |
1653 | * out_delete_net does not work before lxc_clone. |
1654 | */ | |
cfc62c60 CB |
1655 | ret = lxc_find_gateway_addresses(handler); |
1656 | if (ret < 0) { | |
1657 | ERROR("Failed to find gateway addresses"); | |
95ef0d7c | 1658 | goto out_sync_fini; |
9f30a190 MM |
1659 | } |
1660 | ||
408da065 CB |
1661 | /* That should be done before the clone because we will |
1662 | * fill the netdev index and use them in the child. | |
9f30a190 | 1663 | */ |
cfc62c60 CB |
1664 | ret = lxc_create_network_priv(handler); |
1665 | if (ret < 0) { | |
1666 | ERROR("Failed to create the network"); | |
78852a0c | 1667 | goto out_delete_net; |
9f30a190 | 1668 | } |
19a26f82 | 1669 | } |
82d5ae15 DL |
1670 | } |
1671 | ||
e8b181f5 | 1672 | if (!cgroup_ops->payload_create(cgroup_ops, handler)) { |
cfc62c60 | 1673 | ERROR("Failed creating cgroups"); |
47d8fb3b CS |
1674 | goto out_delete_net; |
1675 | } | |
1676 | ||
408da065 CB |
1677 | /* If the rootfs is not a blockdev, prevent the container from marking |
1678 | * it readonly. | |
1679 | * If the container is unprivileged then skip rootfs pinning. | |
0c547523 | 1680 | */ |
0ee35059 | 1681 | if (!wants_to_map_ids) { |
28d9e29e | 1682 | handler->pinfd = pin_rootfs(conf->rootfs.path); |
5e32a990 | 1683 | if (handler->pinfd == -1) |
cfc62c60 | 1684 | INFO("Failed to pin the rootfs for container \"%s\"", handler->name); |
5e32a990 | 1685 | } |
0c547523 | 1686 | |
408da065 | 1687 | /* Create a process in a new set of namespaces. */ |
becad0ec CB |
1688 | handler->ns_on_clone_flags = handler->ns_clone_flags; |
1689 | if (handler->ns_clone_flags & CLONE_NEWUSER) { | |
408da065 CB |
1690 | /* If CLONE_NEWUSER and CLONE_NEWNET was requested, we need to |
1691 | * clone a new user namespace first and only later unshare our | |
1692 | * network namespace to ensure that network devices ownership is | |
1693 | * set up correctly. | |
1694 | */ | |
becad0ec | 1695 | handler->ns_on_clone_flags &= ~CLONE_NEWNET; |
408da065 | 1696 | } |
5af9369b | 1697 | /* The cgroup namespace gets unshare()ed not clone()ed. */ |
becad0ec | 1698 | handler->ns_on_clone_flags &= ~CLONE_NEWCGROUP; |
732375f5 | 1699 | |
4e232466 CB |
1700 | if (share_ns) { |
1701 | pid_t attacher_pid; | |
1702 | ||
cfc62c60 CB |
1703 | attacher_pid = lxc_clone(do_share_ns, handler, |
1704 | CLONE_VFORK | CLONE_VM | CLONE_FILES); | |
4e232466 CB |
1705 | if (attacher_pid < 0) { |
1706 | SYSERROR(LXC_CLONE_ERROR); | |
1707 | goto out_delete_net; | |
1708 | } | |
1709 | ||
1710 | ret = wait_for_pid(attacher_pid); | |
1711 | if (ret < 0) { | |
1712 | SYSERROR("Intermediate process failed"); | |
1713 | goto out_delete_net; | |
1714 | } | |
1715 | } else { | |
cfc62c60 | 1716 | handler->pid = lxc_raw_clone_cb(do_start, handler, |
becad0ec | 1717 | handler->ns_on_clone_flags); |
4e232466 CB |
1718 | } |
1719 | if (handler->pid < 0) { | |
1720 | SYSERROR(LXC_CLONE_ERROR); | |
7fef7a06 | 1721 | goto out_delete_net; |
0ad19a3f | 1722 | } |
fa3a5b22 | 1723 | TRACE("Cloned child process %d", handler->pid); |
1bd8d726 | 1724 | |
9662e444 | 1725 | for (i = 0; i < LXC_NS_MAX; i++) |
becad0ec | 1726 | if (handler->ns_on_clone_flags & ns_info[i].clone_flag) |
28d9e29e | 1727 | INFO("Cloned %s", ns_info[i].flag_name); |
0ad19a3f | 1728 | |
4cb53844 | 1729 | if (!lxc_try_preserve_namespaces(handler, handler->ns_on_clone_flags, handler->pid)) { |
28d9e29e CB |
1730 | ERROR("Failed to preserve cloned namespaces for lxc.hook.stop"); |
1731 | goto out_delete_net; | |
1732 | } | |
b6b2b194 | 1733 | |
3c22086f CLG |
1734 | lxc_sync_fini_child(handler); |
1735 | ||
408da065 CB |
1736 | /* Map the container uids. The container became an invalid userid the |
1737 | * moment it was cloned with CLONE_NEWUSER. This call doesn't change | |
1738 | * anything immediately, but allows the container to setuid(0) (0 being | |
1739 | * mapped to something else on the host.) later to become a valid uid | |
1740 | * again. | |
1741 | */ | |
fa3a5b22 | 1742 | if (wants_to_map_ids) { |
df3c5314 | 1743 | if (!handler->conf->ns_share[LXC_NS_USER] && |
46186acd | 1744 | (handler->conf->ns_keep & CLONE_NEWUSER) == 0) { |
fa3a5b22 CB |
1745 | ret = lxc_map_ids(id_map, handler->pid); |
1746 | if (ret < 0) { | |
1747 | ERROR("Failed to set up id mapping."); | |
1748 | goto out_delete_net; | |
1749 | } | |
1750 | } | |
5b1e83cb SH |
1751 | } |
1752 | ||
cfc62c60 CB |
1753 | ret = lxc_sync_wake_child(handler, LXC_SYNC_STARTUP); |
1754 | if (ret < 0) | |
5b1e83cb | 1755 | goto out_delete_net; |
5b1e83cb | 1756 | |
cfc62c60 CB |
1757 | ret = lxc_sync_wait_child(handler, LXC_SYNC_CONFIGURE); |
1758 | if (ret < 0) | |
5b1e83cb | 1759 | goto out_delete_net; |
0ad19a3f | 1760 | |
2202afc9 | 1761 | if (!cgroup_ops->setup_limits(cgroup_ops, handler->conf, false)) { |
cfc62c60 | 1762 | ERROR("Failed to setup cgroup limits for container \"%s\"", name); |
6031a6e5 DE |
1763 | goto out_delete_net; |
1764 | } | |
1765 | ||
e8b181f5 | 1766 | if (!cgroup_ops->payload_enter(cgroup_ops, handler->pid)) |
7fef7a06 | 1767 | goto out_delete_net; |
218d4250 | 1768 | |
2202afc9 | 1769 | if (!cgroup_ops->chown(cgroup_ops, handler->conf)) |
0996e18a SH |
1770 | goto out_delete_net; |
1771 | ||
fa3a5b22 | 1772 | /* Now we're ready to preserve the network namespace */ |
4cb53844 | 1773 | ret = lxc_try_preserve_ns(handler->pid, "net"); |
fa3a5b22 | 1774 | if (ret < 0) { |
4cb53844 | 1775 | if (ret != -EOPNOTSUPP) { |
6d1400b5 | 1776 | SYSERROR("Failed to preserve net namespace"); |
4cb53844 CB |
1777 | goto out_delete_net; |
1778 | } | |
1779 | } else { | |
1780 | handler->nsfd[LXC_NS_NET] = ret; | |
1781 | DEBUG("Preserved net namespace via fd %d", ret); | |
1cd95214 CB |
1782 | |
1783 | ret = lxc_netns_set_nsid(handler->nsfd[LXC_NS_NET]); | |
bfcedc7e | 1784 | if (ret < 0) |
4752343f | 1785 | SYSWARN("Failed to allocate new network namespace id"); |
bfcedc7e | 1786 | else |
b7986d0d | 1787 | TRACE("Allocated new network namespace id"); |
fa3a5b22 | 1788 | } |
fa3a5b22 | 1789 | |
408da065 | 1790 | /* Create the network configuration. */ |
becad0ec | 1791 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
cfc62c60 CB |
1792 | ret = lxc_network_move_created_netdev_priv(handler->lxcpath, |
1793 | handler->name, | |
1794 | &conf->network, | |
1795 | handler->pid); | |
1796 | if (ret < 0) { | |
1797 | ERROR("Failed to create the configured network"); | |
7fef7a06 | 1798 | goto out_delete_net; |
82d5ae15 | 1799 | } |
74c6e2b0 | 1800 | |
cfc62c60 | 1801 | ret = lxc_create_network_unpriv(handler->lxcpath, handler->name, |
4d781681 | 1802 | &conf->network, handler->pid, conf->hooks_version); |
cfc62c60 CB |
1803 | if (ret < 0) { |
1804 | ERROR("Failed to create the configured network"); | |
74c6e2b0 CB |
1805 | goto out_delete_net; |
1806 | } | |
0ad19a3f | 1807 | } |
1808 | ||
cfc62c60 CB |
1809 | ret = lxc_network_send_veth_names_to_child(handler); |
1810 | if (ret < 0) { | |
7ab1ba02 CB |
1811 | ERROR("Failed to send veth names to child"); |
1812 | goto out_delete_net; | |
658979c5 SH |
1813 | } |
1814 | ||
61d7a733 YT |
1815 | if (!lxc_list_empty(&conf->procs)) { |
1816 | ret = setup_proc_filesystem(&conf->procs, handler->pid); | |
1817 | if (ret < 0) | |
1818 | goto out_delete_net; | |
1819 | } | |
1820 | ||
408da065 CB |
1821 | /* Tell the child to continue its initialization. We'll get |
1822 | * LXC_SYNC_CGROUP when it is ready for us to setup cgroups. | |
3c22086f | 1823 | */ |
cfc62c60 CB |
1824 | ret = lxc_sync_barrier_child(handler, LXC_SYNC_POST_CONFIGURE); |
1825 | if (ret < 0) | |
544a48a0 SH |
1826 | goto out_delete_net; |
1827 | ||
cfc62c60 CB |
1828 | if (!lxc_list_empty(&conf->limits)) { |
1829 | ret = setup_resource_limits(&conf->limits, handler->pid); | |
1830 | if (ret < 0) { | |
1831 | ERROR("Failed to setup resource limits"); | |
1832 | goto out_delete_net; | |
1833 | } | |
c6d09e15 WB |
1834 | } |
1835 | ||
cfc62c60 CB |
1836 | ret = lxc_sync_barrier_child(handler, LXC_SYNC_CGROUP_UNSHARE); |
1837 | if (ret < 0) | |
f4152036 CB |
1838 | goto out_delete_net; |
1839 | ||
2202afc9 | 1840 | if (!cgroup_ops->setup_limits(cgroup_ops, handler->conf, true)) { |
cfc62c60 | 1841 | ERROR("Failed to setup legacy device cgroup controller limits"); |
b98f7d6e | 1842 | goto out_delete_net; |
544a48a0 | 1843 | } |
cfc62c60 | 1844 | TRACE("Set up legacy device cgroup controller limits"); |
544a48a0 | 1845 | |
becad0ec | 1846 | if (handler->ns_clone_flags & CLONE_NEWCGROUP) { |
8bf3abfb | 1847 | /* Now we're ready to preserve the cgroup namespace */ |
4cb53844 | 1848 | ret = lxc_try_preserve_ns(handler->pid, "cgroup"); |
8bf3abfb | 1849 | if (ret < 0) { |
4cb53844 | 1850 | if (ret != -EOPNOTSUPP) { |
6d1400b5 | 1851 | SYSERROR("Failed to preserve cgroup namespace"); |
4cb53844 CB |
1852 | goto out_delete_net; |
1853 | } | |
1854 | } else { | |
1855 | handler->nsfd[LXC_NS_CGROUP] = ret; | |
1856 | DEBUG("Preserved cgroup namespace via fd %d", ret); | |
8bf3abfb | 1857 | } |
8bf3abfb CB |
1858 | } |
1859 | ||
5b7f756a CB |
1860 | ret = snprintf(pidstr, 20, "%d", handler->pid); |
1861 | if (ret < 0 || ret >= 20) | |
1862 | goto out_delete_net; | |
1863 | ||
cfc62c60 CB |
1864 | ret = setenv("LXC_PID", pidstr, 1); |
1865 | if (ret < 0) | |
1866 | SYSERROR("Failed to set environment variable: LXC_PID=%s", pidstr); | |
08dd2805 SH |
1867 | |
1868 | /* Run any host-side start hooks */ | |
cfc62c60 CB |
1869 | ret = run_lxc_hooks(name, "start-host", conf, NULL); |
1870 | if (ret < 0) { | |
1871 | ERROR("Failed to run lxc.hook.start-host"); | |
341ed84c | 1872 | goto out_delete_net; |
08dd2805 SH |
1873 | } |
1874 | ||
408da065 CB |
1875 | /* Tell the child to complete its initialization and wait for it to exec |
1876 | * or return an error. (The child will never return | |
08dd2805 | 1877 | * LXC_SYNC_READY_START+1. It will either close the sync pipe, causing |
408da065 CB |
1878 | * lxc_sync_barrier_child to return success, or return a different |
1879 | * value, causing us to error out). | |
544a48a0 | 1880 | */ |
cfc62c60 CB |
1881 | ret = lxc_sync_barrier_child(handler, LXC_SYNC_READY_START); |
1882 | if (ret < 0) | |
341ed84c | 1883 | goto out_delete_net; |
0ad19a3f | 1884 | |
cfc62c60 CB |
1885 | ret = lxc_network_recv_name_and_ifindex_from_child(handler); |
1886 | if (ret < 0) { | |
790255cf CB |
1887 | ERROR("Failed to receive names and ifindices for network " |
1888 | "devices from child"); | |
1889 | goto out_delete_net; | |
1890 | } | |
1891 | ||
1892 | /* Now all networks are created, network devices are moved into place, | |
ad2ddfcd | 1893 | * and the correct names and ifindices in the respective namespaces have |
790255cf CB |
1894 | * been recorded. The corresponding structs have now all been filled. So |
1895 | * log them for debugging purposes. | |
1896 | */ | |
28d9e29e | 1897 | lxc_log_configured_netdevs(conf); |
790255cf | 1898 | |
f4152036 | 1899 | /* Read tty fds allocated by child. */ |
cfc62c60 CB |
1900 | ret = lxc_recv_ttys_from_child(handler); |
1901 | if (ret < 0) { | |
1902 | ERROR("Failed to receive tty info from child process"); | |
f4152036 CB |
1903 | goto out_delete_net; |
1904 | } | |
1905 | ||
c3e3c21a CB |
1906 | ret = lxc_seccomp_recv_notifier_fd(&handler->conf->seccomp, data_sock1); |
1907 | if (ret < 0) { | |
1908 | SYSERROR("Failed to receive seccomp notify fd from child"); | |
1909 | goto out_delete_net; | |
cdb2a47f | 1910 | } |
cdb2a47f | 1911 | |
cfc62c60 CB |
1912 | ret = handler->ops->post_start(handler, handler->data); |
1913 | if (ret < 0) | |
e6126dbe MN |
1914 | goto out_abort; |
1915 | ||
cfc62c60 CB |
1916 | ret = lxc_set_state(name, handler, RUNNING); |
1917 | if (ret < 0) { | |
1918 | ERROR("Failed to set state to \"%s\"", lxc_state2str(RUNNING)); | |
59eb99ba | 1919 | goto out_abort; |
3f21c114 | 1920 | } |
22ebac19 | 1921 | |
3c22086f | 1922 | lxc_sync_fini(handler); |
0c547523 | 1923 | |
e6126dbe | 1924 | return 0; |
1ac470c0 | 1925 | |
7fef7a06 | 1926 | out_delete_net: |
becad0ec | 1927 | if (handler->ns_clone_flags & CLONE_NEWNET) |
bb84beda | 1928 | lxc_delete_network(handler); |
1bd8d726 | 1929 | |
59eb99ba DL |
1930 | out_abort: |
1931 | lxc_abort(name, handler); | |
95ef0d7c CB |
1932 | |
1933 | out_sync_fini: | |
3c22086f | 1934 | lxc_sync_fini(handler); |
5c068da9 SH |
1935 | if (handler->pinfd >= 0) { |
1936 | close(handler->pinfd); | |
1937 | handler->pinfd = -1; | |
1938 | } | |
1939 | ||
b79fcd86 | 1940 | return -1; |
59eb99ba | 1941 | } |
0ad19a3f | 1942 | |
aa460476 | 1943 | int __lxc_start(const char *name, struct lxc_handler *handler, |
507cee36 | 1944 | struct lxc_operations* ops, void *data, const char *lxcpath, |
bb955810 | 1945 | bool daemonize, int *error_num) |
59eb99ba | 1946 | { |
c30e9b19 | 1947 | int ret, status; |
aa460476 | 1948 | struct lxc_conf *conf = handler->conf; |
72068e74 | 1949 | struct cgroup_ops *cgroup_ops; |
80090207 | 1950 | |
c30e9b19 CB |
1951 | ret = lxc_init(name, handler); |
1952 | if (ret < 0) { | |
1953 | ERROR("Failed to initialize container \"%s\"", name); | |
66aeffc7 | 1954 | return -1; |
0ad19a3f | 1955 | } |
ee70bf78 CLG |
1956 | handler->ops = ops; |
1957 | handler->data = data; | |
bb955810 | 1958 | handler->daemonize = daemonize; |
72068e74 | 1959 | cgroup_ops = handler->cgroup_ops; |
e6126dbe | 1960 | |
76a26f55 | 1961 | if (!attach_block_device(handler->conf)) { |
c30e9b19 | 1962 | ERROR("Failed to attach block device"); |
575ea467 | 1963 | ret = -1; |
76a26f55 SH |
1964 | goto out_fini_nonet; |
1965 | } | |
1966 | ||
72068e74 CB |
1967 | if (!cgroup_ops->monitor_create(cgroup_ops, handler)) { |
1968 | ERROR("Failed to create monitor cgroup"); | |
575ea467 | 1969 | ret = -1; |
eeef32bb CB |
1970 | goto out_fini_nonet; |
1971 | } | |
1972 | ||
434c8e15 | 1973 | if (!cgroup_ops->monitor_enter(cgroup_ops, handler->monitor_pid)) { |
eeef32bb | 1974 | ERROR("Failed to enter monitor cgroup"); |
575ea467 | 1975 | ret = -1; |
72068e74 CB |
1976 | goto out_fini_nonet; |
1977 | } | |
1978 | ||
35120d9c | 1979 | if (geteuid() == 0 && !lxc_list_empty(&conf->id_map)) { |
408da065 | 1980 | /* If the backing store is a device, mount it here and now. */ |
35120d9c | 1981 | if (rootfs_is_blockdev(conf)) { |
c30e9b19 CB |
1982 | ret = unshare(CLONE_NEWNS); |
1983 | if (ret < 0) { | |
1984 | ERROR("Failed to unshare CLONE_NEWNS"); | |
35120d9c SH |
1985 | goto out_fini_nonet; |
1986 | } | |
c30e9b19 | 1987 | INFO("Unshared CLONE_NEWNS"); |
408da065 | 1988 | |
6a0c909a | 1989 | remount_all_slave(); |
8ce1abc2 | 1990 | ret = lxc_setup_rootfs_prepare_root(conf, name, lxcpath); |
c30e9b19 CB |
1991 | if (ret < 0) { |
1992 | ERROR("Error setting up rootfs mount as root before spawn"); | |
35120d9c SH |
1993 | goto out_fini_nonet; |
1994 | } | |
c30e9b19 | 1995 | INFO("Set up container rootfs as host root"); |
35120d9c SH |
1996 | } |
1997 | } | |
1998 | ||
c30e9b19 CB |
1999 | ret = lxc_spawn(handler); |
2000 | if (ret < 0) { | |
2001 | ERROR("Failed to spawn container \"%s\"", name); | |
76a26f55 | 2002 | goto out_detach_blockdev; |
0ad19a3f | 2003 | } |
2004 | ||
80308d07 | 2005 | handler->conf->reboot = REBOOT_NONE; |
8bee8851 | 2006 | |
c30e9b19 CB |
2007 | ret = lxc_poll(name, handler); |
2008 | if (ret) { | |
2009 | ERROR("LXC mainloop exited with error: %d", ret); | |
59eb99ba DL |
2010 | goto out_abort; |
2011 | } | |
0ad19a3f | 2012 | |
321db026 DJ |
2013 | if (!handler->init_died && handler->pid > 0) { |
2014 | ERROR("Child process is not killed"); | |
575ea467 | 2015 | ret = -1; |
321db026 DJ |
2016 | goto out_abort; |
2017 | } | |
2018 | ||
c30e9b19 CB |
2019 | status = lxc_wait_for_pid_status(handler->pid); |
2020 | if (status < 0) | |
2021 | SYSERROR("Failed to retrieve status for %d", handler->pid); | |
e043236e | 2022 | |
408da065 CB |
2023 | /* If the child process exited but was not signaled, it didn't call |
2024 | * reboot. This should mean it was an lxc-execute which simply exited. | |
2025 | * In any case, treat it as a 'halt'. | |
8b004f07 | 2026 | */ |
d028235d | 2027 | if (WIFSIGNALED(status)) { |
8b004f07 SH |
2028 | switch(WTERMSIG(status)) { |
2029 | case SIGINT: /* halt */ | |
c30e9b19 | 2030 | DEBUG("Container \"%s\" is halting", name); |
8b004f07 SH |
2031 | break; |
2032 | case SIGHUP: /* reboot */ | |
c30e9b19 | 2033 | DEBUG("Container \"%s\" is rebooting", name); |
80308d07 | 2034 | handler->conf->reboot = REBOOT_REQ; |
8b004f07 | 2035 | break; |
c2b9bd9e | 2036 | case SIGSYS: /* seccomp */ |
c30e9b19 | 2037 | DEBUG("Container \"%s\" violated its seccomp policy", name); |
c2b9bd9e | 2038 | break; |
8b004f07 | 2039 | default: |
c30e9b19 | 2040 | DEBUG("Unknown exit status for container \"%s\" init %d", name, WTERMSIG(status)); |
8b004f07 SH |
2041 | break; |
2042 | } | |
d028235d | 2043 | } |
828695d9 | 2044 | |
c30e9b19 CB |
2045 | ret = lxc_restore_phys_nics_to_netns(handler); |
2046 | if (ret < 0) | |
b809f232 CB |
2047 | ERROR("Failed to move physical network devices back to parent " |
2048 | "network namespace"); | |
ce5782df | 2049 | |
5c068da9 SH |
2050 | if (handler->pinfd >= 0) { |
2051 | close(handler->pinfd); | |
2052 | handler->pinfd = -1; | |
2053 | } | |
2054 | ||
1787abca | 2055 | lxc_monitor_send_exit_code(name, status, handler->lxcpath); |
eb808539 | 2056 | lxc_error_set_and_log(handler->pid, status); |
a3b4f3d6 TA |
2057 | if (error_num) |
2058 | *error_num = handler->exit_status; | |
1bd8d726 | 2059 | |
9d7f9e52 | 2060 | out_fini: |
bb84beda | 2061 | lxc_delete_network(handler); |
74a2b586 | 2062 | |
76a26f55 SH |
2063 | out_detach_blockdev: |
2064 | detach_block_device(handler->conf); | |
2065 | ||
74a2b586 | 2066 | out_fini_nonet: |
3a0f472d | 2067 | lxc_fini(name, handler); |
c30e9b19 | 2068 | return ret; |
0ad19a3f | 2069 | |
59eb99ba | 2070 | out_abort: |
3a0f472d | 2071 | lxc_abort(name, handler); |
9d7f9e52 | 2072 | goto out_fini; |
0ad19a3f | 2073 | } |
ee70bf78 CLG |
2074 | |
2075 | struct start_args { | |
2076 | char *const *argv; | |
2077 | }; | |
2078 | ||
2079 | static int start(struct lxc_handler *handler, void* data) | |
2080 | { | |
2081 | struct start_args *arg = data; | |
2082 | ||
984984e4 | 2083 | NOTICE("Exec'ing \"%s\"", arg->argv[0]); |
ee70bf78 CLG |
2084 | |
2085 | execvp(arg->argv[0], arg->argv); | |
984984e4 | 2086 | SYSERROR("Failed to exec \"%s\"", arg->argv[0]); |
ee70bf78 CLG |
2087 | return 0; |
2088 | } | |
2089 | ||
2090 | static int post_start(struct lxc_handler *handler, void* data) | |
2091 | { | |
2092 | struct start_args *arg = data; | |
2093 | ||
4c8e880e | 2094 | NOTICE("Started \"%s\" with pid \"%d\"", arg->argv[0], handler->pid); |
ee70bf78 CLG |
2095 | return 0; |
2096 | } | |
2097 | ||
2098 | static struct lxc_operations start_ops = { | |
2099 | .start = start, | |
2100 | .post_start = post_start | |
2101 | }; | |
2102 | ||
aa460476 | 2103 | int lxc_start(const char *name, char *const argv[], struct lxc_handler *handler, |
bb955810 | 2104 | const char *lxcpath, bool daemonize, int *error_num) |
ee70bf78 CLG |
2105 | { |
2106 | struct start_args start_arg = { | |
2107 | .argv = argv, | |
2108 | }; | |
2109 | ||
b2efeb0b | 2110 | TRACE("Doing lxc_start"); |
bb955810 | 2111 | return __lxc_start(name, handler, &start_ops, &start_arg, lxcpath, daemonize, error_num); |
ee70bf78 | 2112 | } |
28272964 CB |
2113 | |
2114 | static void lxc_destroy_container_on_signal(struct lxc_handler *handler, | |
2115 | const char *name) | |
2116 | { | |
245100a0 | 2117 | char destroy[PATH_MAX]; |
f01f7975 | 2118 | struct lxc_container *c; |
ae3beac9 CB |
2119 | int ret = 0; |
2120 | bool bret = true; | |
2121 | ||
df31363a | 2122 | if (handler->conf->rootfs.path && handler->conf->rootfs.mount) { |
790255cf | 2123 | bret = do_destroy_container(handler); |
28272964 | 2124 | if (!bret) { |
ae3beac9 | 2125 | ERROR("Error destroying rootfs for container \"%s\"", name); |
28272964 CB |
2126 | return; |
2127 | } | |
2128 | } | |
ae3beac9 | 2129 | INFO("Destroyed rootfs for container \"%s\"", name); |
28272964 | 2130 | |
245100a0 CB |
2131 | ret = snprintf(destroy, PATH_MAX, "%s/%s", handler->lxcpath, name); |
2132 | if (ret < 0 || ret >= PATH_MAX) { | |
ae3beac9 | 2133 | ERROR("Error destroying directory for container \"%s\"", name); |
28272964 CB |
2134 | return; |
2135 | } | |
2136 | ||
f01f7975 CB |
2137 | c = lxc_container_new(name, handler->lxcpath); |
2138 | if (c) { | |
2139 | if (container_disk_lock(c)) { | |
ae3beac9 | 2140 | INFO("Could not update lxc_snapshots file"); |
f01f7975 CB |
2141 | lxc_container_put(c); |
2142 | } else { | |
2143 | mod_all_rdeps(c, false); | |
2144 | container_disk_unlock(c); | |
2145 | lxc_container_put(c); | |
2146 | } | |
2147 | } | |
2148 | ||
d0fbc7ba | 2149 | if (!handler->am_root) |
94b0a3ac CB |
2150 | ret = userns_exec_full(handler->conf, lxc_rmdir_onedev_wrapper, |
2151 | destroy, "lxc_rmdir_onedev_wrapper"); | |
28272964 CB |
2152 | else |
2153 | ret = lxc_rmdir_onedev(destroy, NULL); | |
2154 | ||
2155 | if (ret < 0) { | |
ae3beac9 | 2156 | ERROR("Error destroying directory for container \"%s\"", name); |
28272964 CB |
2157 | return; |
2158 | } | |
ae3beac9 | 2159 | INFO("Destroyed directory for container \"%s\"", name); |
28272964 CB |
2160 | } |
2161 | ||
2162 | static int lxc_rmdir_onedev_wrapper(void *data) | |
2163 | { | |
2164 | char *arg = (char *) data; | |
2165 | return lxc_rmdir_onedev(arg, NULL); | |
2166 | } | |
2167 | ||
134df645 CB |
2168 | static bool do_destroy_container(struct lxc_handler *handler) |
2169 | { | |
94b0a3ac CB |
2170 | int ret; |
2171 | ||
d0fbc7ba | 2172 | if (!handler->am_root) { |
94b0a3ac CB |
2173 | ret = userns_exec_full(handler->conf, storage_destroy_wrapper, |
2174 | handler->conf, "storage_destroy_wrapper"); | |
2175 | if (ret < 0) | |
d028235d | 2176 | return false; |
10bc1861 | 2177 | |
d028235d SG |
2178 | return true; |
2179 | } | |
10bc1861 | 2180 | |
790255cf | 2181 | return storage_destroy(handler->conf); |
28272964 | 2182 | } |