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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
23 | ||
f549edcc GK |
24 | #include "config.h" |
25 | ||
0ad19a3f | 26 | #include <stdio.h> |
0ad19a3f | 27 | #include <string.h> |
28 | #include <stdlib.h> | |
29 | #include <dirent.h> | |
30 | #include <errno.h> | |
31 | #include <unistd.h> | |
32 | #include <signal.h> | |
b0a33c1e | 33 | #include <fcntl.h> |
c476bdce | 34 | #include <grp.h> |
37515ebd | 35 | #include <poll.h> |
0ad19a3f | 36 | #include <sys/param.h> |
37 | #include <sys/file.h> | |
f4d507d5 | 38 | #include <sys/mount.h> |
b4f8660e | 39 | #include <sys/stat.h> |
0ad19a3f | 40 | #include <sys/types.h> |
8173e600 | 41 | #include <sys/socket.h> |
0ad19a3f | 42 | #include <sys/prctl.h> |
ddceb1f9 | 43 | #include <sys/types.h> |
0ad19a3f | 44 | #include <sys/wait.h> |
b0a33c1e | 45 | #include <sys/un.h> |
8173e600 | 46 | #include <sys/syscall.h> |
ff218c25 | 47 | |
495d2046 SG |
48 | #if HAVE_SYS_CAPABILITY_H |
49 | #include <sys/capability.h> | |
50 | #endif | |
51 | ||
656994bb MH |
52 | #if !HAVE_DECL_PR_CAPBSET_DROP |
53 | #define PR_CAPBSET_DROP 24 | |
54 | #endif | |
55 | ||
63376d7d DL |
56 | #include "start.h" |
57 | #include "conf.h" | |
58 | #include "log.h" | |
563f2f2c | 59 | #include "cgroup.h" |
e2bcd7db | 60 | #include "error.h" |
b0a33c1e | 61 | #include "af_unix.h" |
62 | #include "mainloop.h" | |
63376d7d | 63 | #include "utils.h" |
565c2d76 | 64 | #include "lxcutmp.h" |
63376d7d | 65 | #include "monitor.h" |
96fa1ff0 | 66 | #include "commands.h" |
63376d7d | 67 | #include "console.h" |
3c22086f | 68 | #include "sync.h" |
f549edcc | 69 | #include "namespace.h" |
0d0527a9 | 70 | #include "lxcseccomp.h" |
8173e600 | 71 | #include "caps.h" |
fe4de9a6 | 72 | #include "lsm/lsm.h" |
36eb9bde CLG |
73 | |
74 | lxc_log_define(lxc_start, lxc); | |
75 | ||
9f30a190 MM |
76 | const struct ns_info ns_info[LXC_NS_MAX] = { |
77 | [LXC_NS_MNT] = {"mnt", CLONE_NEWNS}, | |
78 | [LXC_NS_PID] = {"pid", CLONE_NEWPID}, | |
79 | [LXC_NS_UTS] = {"uts", CLONE_NEWUTS}, | |
80 | [LXC_NS_IPC] = {"ipc", CLONE_NEWIPC}, | |
81 | [LXC_NS_USER] = {"user", CLONE_NEWUSER}, | |
82 | [LXC_NS_NET] = {"net", CLONE_NEWNET} | |
83 | }; | |
84 | ||
c8154066 SH |
85 | static void print_top_failing_dir(const char *path) |
86 | { | |
87 | size_t len = strlen(path); | |
88 | char *copy = alloca(len+1), *p, *e, saved; | |
89 | strcpy(copy, path); | |
90 | ||
91 | p = copy; | |
92 | e = copy + len; | |
93 | while (p < e) { | |
94 | while (p < e && *p == '/') p++; | |
95 | while (p < e && *p != '/') p++; | |
c8154066 SH |
96 | saved = *p; |
97 | *p = '\0'; | |
98 | if (access(copy, X_OK)) { | |
99 | SYSERROR("could not access %s. Please grant it 'x' " \ | |
100 | "access, or add an ACL for the container root.", | |
101 | copy); | |
102 | return; | |
103 | } | |
104 | *p = saved; | |
105 | } | |
106 | } | |
107 | ||
9f30a190 MM |
108 | static void close_ns(int ns_fd[LXC_NS_MAX]) { |
109 | int i; | |
110 | ||
9f30a190 MM |
111 | for (i = 0; i < LXC_NS_MAX; i++) { |
112 | if (ns_fd[i] > -1) { | |
113 | close(ns_fd[i]); | |
114 | ns_fd[i] = -1; | |
115 | } | |
116 | } | |
9f30a190 MM |
117 | } |
118 | ||
119 | static int preserve_ns(int ns_fd[LXC_NS_MAX], int clone_flags) { | |
120 | int i, saved_errno; | |
121 | char path[MAXPATHLEN]; | |
122 | ||
9f30a190 MM |
123 | for (i = 0; i < LXC_NS_MAX; i++) |
124 | ns_fd[i] = -1; | |
125 | ||
cd43d2d1 SH |
126 | if (access("/proc/self/ns", X_OK)) { |
127 | WARN("Kernel does not support attach; preserve_ns ignored"); | |
128 | return 0; | |
129 | } | |
130 | ||
9f30a190 MM |
131 | for (i = 0; i < LXC_NS_MAX; i++) { |
132 | if ((clone_flags & ns_info[i].clone_flag) == 0) | |
133 | continue; | |
134 | snprintf(path, MAXPATHLEN, "/proc/self/ns/%s", ns_info[i].proc_name); | |
9f30a190 | 135 | ns_fd[i] = open(path, O_RDONLY | O_CLOEXEC); |
9f30a190 MM |
136 | if (ns_fd[i] < 0) |
137 | goto error; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | ||
142 | error: | |
143 | saved_errno = errno; | |
144 | close_ns(ns_fd); | |
145 | errno = saved_errno; | |
146 | SYSERROR("failed to open '%s'", path); | |
147 | return -1; | |
148 | } | |
149 | ||
150 | static int attach_ns(const int ns_fd[LXC_NS_MAX]) { | |
151 | int i; | |
152 | ||
153 | for (i = 0; i < LXC_NS_MAX; i++) { | |
154 | if (ns_fd[i] < 0) | |
155 | continue; | |
156 | ||
157 | if (setns(ns_fd[i], 0) != 0) | |
158 | goto error; | |
159 | } | |
160 | return 0; | |
161 | ||
162 | error: | |
163 | SYSERROR("failed to set namespace '%s'", ns_info[i].proc_name); | |
164 | return -1; | |
165 | } | |
166 | ||
80090207 CLG |
167 | static int match_fd(int fd) |
168 | { | |
169 | return (fd == 0 || fd == 1 || fd == 2); | |
170 | } | |
171 | ||
b119f362 | 172 | int lxc_check_inherited(struct lxc_conf *conf, int fd_to_ignore) |
80090207 CLG |
173 | { |
174 | struct dirent dirent, *direntp; | |
175 | int fd, fddir; | |
176 | DIR *dir; | |
80090207 | 177 | |
b119f362 | 178 | restart: |
80090207 CLG |
179 | dir = opendir("/proc/self/fd"); |
180 | if (!dir) { | |
181 | WARN("failed to open directory: %m"); | |
182 | return -1; | |
183 | } | |
184 | ||
185 | fddir = dirfd(dir); | |
186 | ||
187 | while (!readdir_r(dir, &dirent, &direntp)) { | |
80090207 CLG |
188 | if (!direntp) |
189 | break; | |
190 | ||
191 | if (!strcmp(direntp->d_name, ".")) | |
192 | continue; | |
193 | ||
194 | if (!strcmp(direntp->d_name, "..")) | |
195 | continue; | |
196 | ||
197 | fd = atoi(direntp->d_name); | |
198 | ||
f2faa8fa | 199 | if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore) |
80090207 CLG |
200 | continue; |
201 | ||
202 | if (match_fd(fd)) | |
203 | continue; | |
80090207 | 204 | |
b119f362 SH |
205 | if (conf->close_all_fds) { |
206 | close(fd); | |
207 | closedir(dir); | |
208 | INFO("closed inherited fd %d", fd); | |
209 | goto restart; | |
210 | } | |
92c7f629 | 211 | WARN("inherited fd %d", fd); |
80090207 CLG |
212 | } |
213 | ||
92c7f629 GK |
214 | closedir(dir); /* cannot fail */ |
215 | return 0; | |
80090207 CLG |
216 | } |
217 | ||
83ee7875 | 218 | static int setup_signal_fd(sigset_t *oldmask) |
b0a33c1e | 219 | { |
220 | sigset_t mask; | |
221 | int fd; | |
222 | ||
f3304a29 FW |
223 | /* Block everything except serious error signals */ |
224 | if (sigfillset(&mask) || | |
225 | sigdelset(&mask, SIGILL) || | |
226 | sigdelset(&mask, SIGSEGV) || | |
227 | sigdelset(&mask, SIGBUS) || | |
b5159817 | 228 | sigdelset(&mask, SIGWINCH) || |
f3304a29 FW |
229 | sigprocmask(SIG_BLOCK, &mask, oldmask)) { |
230 | SYSERROR("failed to set signal mask"); | |
b0a33c1e | 231 | return -1; |
232 | } | |
233 | ||
234 | fd = signalfd(-1, &mask, 0); | |
235 | if (fd < 0) { | |
36eb9bde | 236 | SYSERROR("failed to create the signal fd"); |
b0a33c1e | 237 | return -1; |
238 | } | |
239 | ||
240 | if (fcntl(fd, F_SETFD, FD_CLOEXEC)) { | |
36eb9bde | 241 | SYSERROR("failed to set sigfd to close-on-exec"); |
b0a33c1e | 242 | close(fd); |
243 | return -1; | |
244 | } | |
245 | ||
1ac470c0 DL |
246 | DEBUG("sigchild handler set"); |
247 | ||
b0a33c1e | 248 | return fd; |
249 | } | |
250 | ||
84c92abd | 251 | static int signal_handler(int fd, uint32_t events, void *data, |
b0a33c1e | 252 | struct lxc_epoll_descr *descr) |
253 | { | |
15cd25fd | 254 | struct signalfd_siginfo siginfo; |
80507ee8 | 255 | siginfo_t info; |
15cd25fd | 256 | int ret; |
82d89dce | 257 | pid_t *pid = data; |
80507ee8 | 258 | bool init_died = false; |
15cd25fd DL |
259 | |
260 | ret = read(fd, &siginfo, sizeof(siginfo)); | |
261 | if (ret < 0) { | |
f3304a29 | 262 | ERROR("failed to read signal info"); |
15cd25fd DL |
263 | return -1; |
264 | } | |
265 | ||
266 | if (ret != sizeof(siginfo)) { | |
267 | ERROR("unexpected siginfo size"); | |
268 | return -1; | |
269 | } | |
270 | ||
80507ee8 SH |
271 | // check whether init is running |
272 | info.si_pid = 0; | |
273 | ret = waitid(P_PID, *pid, &info, WEXITED | WNOWAIT | WNOHANG); | |
274 | if (ret == 0 && info.si_pid == *pid) { | |
275 | init_died = true; | |
276 | } | |
277 | ||
f3304a29 FW |
278 | if (siginfo.ssi_signo != SIGCHLD) { |
279 | kill(*pid, siginfo.ssi_signo); | |
280 | INFO("forwarded signal %d to pid %d", siginfo.ssi_signo, *pid); | |
80507ee8 | 281 | return init_died ? 1 : 0; |
f3304a29 FW |
282 | } |
283 | ||
15cd25fd DL |
284 | if (siginfo.ssi_code == CLD_STOPPED || |
285 | siginfo.ssi_code == CLD_CONTINUED) { | |
286 | INFO("container init process was stopped/continued"); | |
80507ee8 | 287 | return init_died ? 1 : 0; |
15cd25fd | 288 | } |
1ac470c0 | 289 | |
82d89dce DL |
290 | /* more robustness, protect ourself from a SIGCHLD sent |
291 | * by a process different from the container init | |
292 | */ | |
293 | if (siginfo.ssi_pid != *pid) { | |
294 | WARN("invalid pid for SIGCHLD"); | |
80507ee8 | 295 | return init_died ? 1 : 0; |
82d89dce DL |
296 | } |
297 | ||
15cd25fd | 298 | DEBUG("container init process exited"); |
b0a33c1e | 299 | return 1; |
300 | } | |
301 | ||
74a3920a | 302 | static int lxc_set_state(const char *name, struct lxc_handler *handler, lxc_state_t state) |
66aeffc7 DL |
303 | { |
304 | handler->state = state; | |
9123e471 | 305 | lxc_monitor_send_state(name, state, handler->lxcpath); |
66aeffc7 DL |
306 | return 0; |
307 | } | |
308 | ||
74a3920a | 309 | static int lxc_poll(const char *name, struct lxc_handler *handler) |
b0a33c1e | 310 | { |
ca5f7926 DL |
311 | int sigfd = handler->sigfd; |
312 | int pid = handler->pid; | |
b0a33c1e | 313 | struct lxc_epoll_descr descr; |
314 | ||
a9e61274 | 315 | if (lxc_mainloop_open(&descr)) { |
36eb9bde | 316 | ERROR("failed to create mainloop"); |
50c8bf05 | 317 | goto out_sigfd; |
b0a33c1e | 318 | } |
319 | ||
83ee7875 | 320 | if (lxc_mainloop_add_handler(&descr, sigfd, signal_handler, &pid)) { |
36eb9bde | 321 | ERROR("failed to add handler for the signal"); |
b0a33c1e | 322 | goto out_mainloop_open; |
323 | } | |
324 | ||
63376d7d DL |
325 | if (lxc_console_mainloop_add(&descr, handler)) { |
326 | ERROR("failed to add console handler to mainloop"); | |
327 | goto out_mainloop_open; | |
328 | } | |
329 | ||
ef6e34ee | 330 | if (lxc_cmd_mainloop_add(name, &descr, handler)) { |
563f2f2c | 331 | ERROR("failed to add command handler to mainloop"); |
96fa1ff0 | 332 | goto out_mainloop_open; |
563f2f2c DL |
333 | } |
334 | ||
828695d9 | 335 | if (handler->conf->need_utmp_watch) { |
495d2046 | 336 | #if HAVE_SYS_CAPABILITY_H |
828695d9 SH |
337 | if (lxc_utmp_mainloop_add(&descr, handler)) { |
338 | ERROR("failed to add utmp handler to mainloop"); | |
339 | goto out_mainloop_open; | |
340 | } | |
495d2046 | 341 | #else |
959aee9c | 342 | DEBUG("not starting utmp handler as cap_sys_boot cannot be dropped without capabilities support"); |
495d2046 | 343 | #endif |
563f2f2c | 344 | } |
b0a33c1e | 345 | |
e51d4895 | 346 | return lxc_mainloop(&descr, -1); |
b0a33c1e | 347 | |
348 | out_mainloop_open: | |
349 | lxc_mainloop_close(&descr); | |
b0a33c1e | 350 | out_sigfd: |
351 | close(sigfd); | |
c3e13372 | 352 | return -1; |
b0a33c1e | 353 | } |
354 | ||
13f5be62 | 355 | struct lxc_handler *lxc_init(const char *name, struct lxc_conf *conf, const char *lxcpath) |
59eb99ba | 356 | { |
3a0f472d DL |
357 | struct lxc_handler *handler; |
358 | ||
359 | handler = malloc(sizeof(*handler)); | |
360 | if (!handler) | |
361 | return NULL; | |
59eb99ba DL |
362 | |
363 | memset(handler, 0, sizeof(*handler)); | |
364 | ||
fae349da | 365 | handler->conf = conf; |
9123e471 | 366 | handler->lxcpath = lxcpath; |
5c068da9 | 367 | handler->pinfd = -1; |
fae349da | 368 | |
fe4de9a6 DE |
369 | lsm_init(); |
370 | ||
3bdf52d7 DL |
371 | handler->name = strdup(name); |
372 | if (!handler->name) { | |
373 | ERROR("failed to allocate memory"); | |
374 | goto out_free; | |
375 | } | |
376 | ||
ef6e34ee | 377 | if (lxc_cmd_init(name, handler, lxcpath)) |
d2e30e99 DE |
378 | goto out_free_name; |
379 | ||
8f2c3a70 SH |
380 | if (lxc_read_seccomp_config(conf) != 0) { |
381 | ERROR("failed loading seccomp policy"); | |
d2e30e99 | 382 | goto out_close_maincmd_fd; |
8f2c3a70 SH |
383 | } |
384 | ||
051151de | 385 | /* Begin by setting the state to STARTING */ |
25c2aca5 | 386 | if (lxc_set_state(name, handler, STARTING)) { |
59eb99ba | 387 | ERROR("failed to set state '%s'", lxc_state2str(STARTING)); |
051151de | 388 | goto out_close_maincmd_fd; |
0ad19a3f | 389 | } |
390 | ||
f7bee6c6 MW |
391 | /* Start of environment variable setup for hooks */ |
392 | if (setenv("LXC_NAME", name, 1)) { | |
393 | SYSERROR("failed to set environment variable for container name"); | |
394 | } | |
395 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
396 | SYSERROR("failed to set environment variable for config path"); | |
397 | } | |
398 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
399 | SYSERROR("failed to set environment variable for rootfs mount"); | |
400 | } | |
401 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
402 | SYSERROR("failed to set environment variable for rootfs mount"); | |
403 | } | |
404 | if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) { | |
405 | SYSERROR("failed to set environment variable for console path"); | |
406 | } | |
407 | if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) { | |
408 | SYSERROR("failed to set environment variable for console log"); | |
409 | } | |
410 | /* End of environment variable setup for hooks */ | |
411 | ||
283678ed | 412 | if (run_lxc_hooks(name, "pre-start", conf, handler->lxcpath, NULL)) { |
773fb9ca SH |
413 | ERROR("failed to run pre-start hooks for container '%s'.", name); |
414 | goto out_aborting; | |
415 | } | |
26ddeedd | 416 | |
fae349da | 417 | if (lxc_create_tty(name, conf)) { |
36eb9bde | 418 | ERROR("failed to create the ttys"); |
59eb99ba | 419 | goto out_aborting; |
b0a33c1e | 420 | } |
421 | ||
422 | /* the signal fd has to be created before forking otherwise | |
423 | * if the child process exits before we setup the signal fd, | |
424 | * the event will be lost and the command will be stuck */ | |
83ee7875 | 425 | handler->sigfd = setup_signal_fd(&handler->oldmask); |
59eb99ba | 426 | if (handler->sigfd < 0) { |
36eb9bde | 427 | ERROR("failed to set sigchild fd handler"); |
b5159817 DE |
428 | goto out_delete_tty; |
429 | } | |
430 | ||
431 | /* do this after setting up signals since it might unblock SIGWINCH */ | |
432 | if (lxc_console_create(conf)) { | |
433 | ERROR("failed to create console"); | |
434 | goto out_restore_sigmask; | |
b0a33c1e | 435 | } |
436 | ||
c4d10a05 SH |
437 | if (ttys_shift_ids(conf) < 0) { |
438 | ERROR("Failed to shift tty into container"); | |
439 | goto out_restore_sigmask; | |
440 | } | |
441 | ||
c3e13372 | 442 | INFO("'%s' is initialized", name); |
3a0f472d | 443 | return handler; |
59eb99ba | 444 | |
b5159817 DE |
445 | out_restore_sigmask: |
446 | sigprocmask(SIG_SETMASK, &handler->oldmask, NULL); | |
59eb99ba | 447 | out_delete_tty: |
fae349da | 448 | lxc_delete_tty(&conf->tty_info); |
59eb99ba | 449 | out_aborting: |
25c2aca5 | 450 | lxc_set_state(name, handler, ABORTING); |
d2e30e99 DE |
451 | out_close_maincmd_fd: |
452 | close(conf->maincmd_fd); | |
453 | conf->maincmd_fd = -1; | |
3bdf52d7 DL |
454 | out_free_name: |
455 | free(handler->name); | |
456 | handler->name = NULL; | |
3a0f472d DL |
457 | out_free: |
458 | free(handler); | |
c3e13372 | 459 | return NULL; |
59eb99ba DL |
460 | } |
461 | ||
ae5c8b8e | 462 | static void lxc_fini(const char *name, struct lxc_handler *handler) |
59eb99ba DL |
463 | { |
464 | /* The STOPPING state is there for future cleanup code | |
465 | * which can take awhile | |
466 | */ | |
25c2aca5 MN |
467 | lxc_set_state(name, handler, STOPPING); |
468 | lxc_set_state(name, handler, STOPPED); | |
59eb99ba | 469 | |
283678ed | 470 | if (run_lxc_hooks(name, "post-stop", handler->conf, handler->lxcpath, NULL)) |
773fb9ca | 471 | ERROR("failed to run post-stop hooks for container '%s'.", name); |
26ddeedd | 472 | |
83ee7875 | 473 | /* reset mask set by setup_signal_fd */ |
8f64a3f6 MN |
474 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) |
475 | WARN("failed to restore sigprocmask"); | |
476 | ||
b5159817 | 477 | lxc_console_delete(&handler->conf->console); |
b2431939 | 478 | lxc_delete_tty(&handler->conf->tty_info); |
d2e30e99 DE |
479 | close(handler->conf->maincmd_fd); |
480 | handler->conf->maincmd_fd = -1; | |
3bdf52d7 | 481 | free(handler->name); |
d4ef7c50 | 482 | cgroup_destroy(handler); |
b2431939 | 483 | free(handler); |
59eb99ba DL |
484 | } |
485 | ||
74a3920a | 486 | static void lxc_abort(const char *name, struct lxc_handler *handler) |
59eb99ba | 487 | { |
73e608b2 SH |
488 | int ret, status; |
489 | ||
25c2aca5 | 490 | lxc_set_state(name, handler, ABORTING); |
7d9fb3e9 DL |
491 | if (handler->pid > 0) |
492 | kill(handler->pid, SIGKILL); | |
73e608b2 | 493 | while ((ret = waitpid(-1, &status, 0)) > 0) ; |
59eb99ba DL |
494 | } |
495 | ||
828695d9 SH |
496 | #include <sys/reboot.h> |
497 | #include <linux/reboot.h> | |
498 | ||
e2fa1520 SH |
499 | /* |
500 | * reboot(LINUX_REBOOT_CMD_CAD_ON) will return -EINVAL | |
501 | * in a child pid namespace if container reboot support exists. | |
502 | * Otherwise, it will either succeed or return -EPERM. | |
503 | */ | |
504 | static int container_reboot_supported(void *arg) | |
828695d9 | 505 | { |
e2fa1520 | 506 | int *cmd = arg; |
828695d9 | 507 | int ret; |
828695d9 | 508 | |
e2fa1520 SH |
509 | ret = reboot(*cmd); |
510 | if (ret == -1 && errno == EINVAL) | |
511 | return 1; | |
512 | return 0; | |
513 | } | |
514 | ||
b60ed720 | 515 | static int must_drop_cap_sys_boot(struct lxc_conf *conf) |
e2fa1520 | 516 | { |
025ed0f3 | 517 | FILE *f; |
b60ed720 | 518 | int ret, cmd, v, flags; |
e2fa1520 | 519 | long stack_size = 4096; |
7f145a6d | 520 | void *stack = alloca(stack_size); |
e2fa1520 SH |
521 | int status; |
522 | pid_t pid; | |
523 | ||
025ed0f3 | 524 | f = fopen("/proc/sys/kernel/ctrl-alt-del", "r"); |
e2fa1520 SH |
525 | if (!f) { |
526 | DEBUG("failed to open /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 527 | return 1; |
e2fa1520 | 528 | } |
828695d9 SH |
529 | |
530 | ret = fscanf(f, "%d", &v); | |
531 | fclose(f); | |
e2fa1520 SH |
532 | if (ret != 1) { |
533 | DEBUG("Failed to read /proc/sys/kernel/ctrl-alt-del"); | |
828695d9 | 534 | return 1; |
e2fa1520 SH |
535 | } |
536 | cmd = v ? LINUX_REBOOT_CMD_CAD_ON : LINUX_REBOOT_CMD_CAD_OFF; | |
537 | ||
b60ed720 SH |
538 | flags = CLONE_NEWPID | SIGCHLD; |
539 | if (!lxc_list_empty(&conf->id_map)) | |
540 | flags |= CLONE_NEWUSER; | |
541 | ||
7f145a6d | 542 | #ifdef __ia64__ |
959aee9c | 543 | pid = __clone2(container_reboot_supported, stack, stack_size, flags, &cmd); |
7f145a6d | 544 | #else |
959aee9c SG |
545 | stack += stack_size; |
546 | pid = clone(container_reboot_supported, stack, flags, &cmd); | |
7f145a6d | 547 | #endif |
959aee9c SG |
548 | if (pid < 0) { |
549 | SYSERROR("failed to clone"); | |
550 | return -1; | |
551 | } | |
552 | if (wait(&status) < 0) { | |
553 | SYSERROR("unexpected wait error: %m"); | |
554 | return -1; | |
555 | } | |
e2fa1520 SH |
556 | |
557 | if (WEXITSTATUS(status) != 1) | |
828695d9 | 558 | return 1; |
e2fa1520 | 559 | |
828695d9 SH |
560 | return 0; |
561 | } | |
562 | ||
658979c5 SH |
563 | /* |
564 | * netpipe is used in the unprivileged case to transfer the ifindexes | |
565 | * from parent to child | |
566 | */ | |
567 | static int netpipe = -1; | |
568 | ||
569 | static inline int count_veths(struct lxc_list *network) | |
570 | { | |
571 | struct lxc_list *iterator; | |
572 | struct lxc_netdev *netdev; | |
573 | int count = 0; | |
574 | ||
575 | lxc_list_for_each(iterator, network) { | |
576 | netdev = iterator->elem; | |
577 | if (netdev->type != LXC_NET_VETH) | |
578 | continue; | |
579 | count++; | |
580 | } | |
581 | return count; | |
582 | } | |
583 | ||
584 | static int read_unpriv_netifindex(struct lxc_list *network) | |
585 | { | |
586 | struct lxc_list *iterator; | |
587 | struct lxc_netdev *netdev; | |
588 | ||
589 | if (netpipe == -1) | |
590 | return 0; | |
591 | lxc_list_for_each(iterator, network) { | |
592 | netdev = iterator->elem; | |
593 | if (netdev->type != LXC_NET_VETH) | |
594 | continue; | |
595 | if (!(netdev->name = malloc(IFNAMSIZ))) { | |
596 | ERROR("Out of memory"); | |
597 | close(netpipe); | |
598 | return -1; | |
599 | } | |
600 | if (read(netpipe, netdev->name, IFNAMSIZ) != IFNAMSIZ) { | |
601 | close(netpipe); | |
602 | return -1; | |
603 | } | |
604 | } | |
605 | close(netpipe); | |
606 | return 0; | |
607 | } | |
608 | ||
ffe1e01a | 609 | static int do_start(void *data) |
50e98013 | 610 | { |
23c53af9 | 611 | struct lxc_handler *handler = data; |
e0b6898a | 612 | const char *lsm_label = NULL; |
50e98013 DL |
613 | |
614 | if (sigprocmask(SIG_SETMASK, &handler->oldmask, NULL)) { | |
615 | SYSERROR("failed to set sigprocmask"); | |
9d7f9e52 | 616 | return -1; |
50e98013 DL |
617 | } |
618 | ||
743ecd2e DL |
619 | /* This prctl must be before the synchro, so if the parent |
620 | * dies before we set the parent death signal, we will detect | |
621 | * its death with the synchro right after, otherwise we have | |
622 | * a window where the parent can exit before we set the pdeath | |
623 | * signal leading to a unsupervized container. | |
624 | */ | |
625 | if (prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0)) { | |
626 | SYSERROR("failed to set pdeath signal"); | |
627 | return -1; | |
628 | } | |
629 | ||
3c22086f | 630 | lxc_sync_fini_parent(handler); |
50e98013 | 631 | |
2b0e17e4 | 632 | /* don't leak the pinfd to the container */ |
025ed0f3 | 633 | if (handler->pinfd >= 0) { |
0d03360a | 634 | close(handler->pinfd); |
025ed0f3 | 635 | } |
2b0e17e4 | 636 | |
3c22086f CLG |
637 | /* Tell the parent task it can begin to configure the |
638 | * container and wait for it to finish | |
639 | */ | |
640 | if (lxc_sync_barrier_parent(handler, LXC_SYNC_CONFIGURE)) | |
9d7f9e52 | 641 | return -1; |
50e98013 | 642 | |
658979c5 SH |
643 | if (read_unpriv_netifindex(&handler->conf->network) < 0) |
644 | goto out_warn_father; | |
645 | ||
f6d3e3e4 SH |
646 | /* |
647 | * if we are in a new user namespace, become root there to have | |
648 | * privilege over our namespace | |
649 | */ | |
650 | if (!lxc_list_empty(&handler->conf->id_map)) { | |
651 | NOTICE("switching to gid/uid 0 in new user namespace"); | |
652 | if (setgid(0)) { | |
653 | SYSERROR("setgid"); | |
654 | goto out_warn_father; | |
655 | } | |
656 | if (setuid(0)) { | |
657 | SYSERROR("setuid"); | |
658 | goto out_warn_father; | |
659 | } | |
c476bdce SH |
660 | if (setgroups(0, NULL)) { |
661 | SYSERROR("setgroups"); | |
662 | goto out_warn_father; | |
663 | } | |
f6d3e3e4 SH |
664 | } |
665 | ||
99b71824 | 666 | if (access(handler->lxcpath, X_OK)) { |
c8154066 SH |
667 | print_top_failing_dir(handler->lxcpath); |
668 | goto out_warn_father; | |
669 | } | |
670 | ||
495d2046 | 671 | #if HAVE_SYS_CAPABILITY_H |
69182a31 | 672 | if (handler->conf->need_utmp_watch) { |
828695d9 SH |
673 | if (prctl(PR_CAPBSET_DROP, CAP_SYS_BOOT, 0, 0, 0)) { |
674 | SYSERROR("failed to remove CAP_SYS_BOOT capability"); | |
c4ea60df | 675 | goto out_warn_father; |
828695d9 | 676 | } |
959aee9c | 677 | DEBUG("Dropped cap_sys_boot"); |
e2fa1520 | 678 | } |
495d2046 | 679 | #endif |
e2fa1520 SH |
680 | |
681 | /* Setup the container, ip, names, utsname, ... */ | |
d4ef7c50 | 682 | if (lxc_setup(handler)) { |
e2fa1520 SH |
683 | ERROR("failed to setup the container"); |
684 | goto out_warn_father; | |
685 | } | |
50e98013 | 686 | |
544a48a0 SH |
687 | /* ask father to setup cgroups and wait for him to finish */ |
688 | if (lxc_sync_barrier_parent(handler, LXC_SYNC_CGROUP)) | |
689 | return -1; | |
690 | ||
72863294 | 691 | /* Set the label to change to when we exec(2) the container's init */ |
e0b6898a DE |
692 | if (!strcmp(lsm_name(), "AppArmor")) |
693 | lsm_label = handler->conf->lsm_aa_profile; | |
694 | else if (!strcmp(lsm_name(), "SELinux")) | |
695 | lsm_label = handler->conf->lsm_se_context; | |
696 | if (lsm_process_label_set(lsm_label, 1, 1) < 0) | |
e075f5d9 | 697 | goto out_warn_father; |
5112cd70 | 698 | |
0d9acb99 DE |
699 | /* Some init's such as busybox will set sane tty settings on stdin, |
700 | * stdout, stderr which it thinks is the console. We already set them | |
701 | * the way we wanted on the real terminal, and we want init to do its | |
702 | * setup on its console ie. the pty allocated in lxc_console_create() | |
703 | * so make sure that that pty is stdin,stdout,stderr. | |
704 | */ | |
705 | if (lxc_console_set_stdfds(handler) < 0) | |
706 | goto out_warn_father; | |
707 | ||
5112cd70 SH |
708 | /* If we mounted a temporary proc, then unmount it now */ |
709 | tmp_proc_unmount(handler->conf); | |
e075f5d9 | 710 | |
8f2c3a70 SH |
711 | if (lxc_seccomp_load(handler->conf) != 0) |
712 | goto out_warn_father; | |
713 | ||
283678ed | 714 | if (run_lxc_hooks(handler->name, "start", handler->conf, handler->lxcpath, NULL)) { |
773fb9ca SH |
715 | ERROR("failed to run start hooks for container '%s'.", handler->name); |
716 | goto out_warn_father; | |
717 | } | |
fc25b815 | 718 | |
f7bee6c6 MW |
719 | /* The clearenv() and putenv() calls have been moved here |
720 | * to allow us to use enviroment variables passed to the various | |
721 | * hooks, such as the start hook above. Not all of the | |
722 | * variables like CONFIG_PATH or ROOTFS are valid in this | |
723 | * context but others are. */ | |
724 | if (clearenv()) { | |
725 | SYSERROR("failed to clear environment"); | |
726 | /* don't error out though */ | |
727 | } | |
728 | ||
729 | if (putenv("container=lxc")) { | |
730 | SYSERROR("failed to set environment variable"); | |
c4ea60df | 731 | goto out_warn_father; |
f7bee6c6 MW |
732 | } |
733 | ||
773fb9ca | 734 | close(handler->sigfd); |
26ddeedd | 735 | |
e6126dbe MN |
736 | /* after this call, we are in error because this |
737 | * ops should not return as it execs */ | |
c4ea60df | 738 | handler->ops->start(handler, handler->data); |
50e98013 DL |
739 | |
740 | out_warn_father: | |
544a48a0 SH |
741 | /* we want the parent to know something went wrong, so any |
742 | * value other than what it expects is ok. */ | |
3c22086f | 743 | lxc_sync_wake_parent(handler, LXC_SYNC_POST_CONFIGURE); |
50e98013 DL |
744 | return -1; |
745 | } | |
746 | ||
74a3920a | 747 | static int save_phys_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
748 | { |
749 | struct lxc_list *iterator; | |
750 | ||
751 | lxc_list_for_each(iterator, &conf->network) { | |
752 | struct lxc_netdev *netdev = iterator->elem; | |
753 | ||
754 | if (netdev->type != LXC_NET_PHYS) | |
755 | continue; | |
756 | conf->saved_nics = realloc(conf->saved_nics, | |
757 | (conf->num_savednics+1)*sizeof(struct saved_nic)); | |
758 | if (!conf->saved_nics) { | |
759 | SYSERROR("failed to allocate memory"); | |
760 | return -1; | |
761 | } | |
762 | conf->saved_nics[conf->num_savednics].ifindex = netdev->ifindex; | |
763 | conf->saved_nics[conf->num_savednics].orig_name = strdup(netdev->link); | |
764 | if (!conf->saved_nics[conf->num_savednics].orig_name) { | |
765 | SYSERROR("failed to allocate memory"); | |
766 | return -1; | |
767 | } | |
959aee9c | 768 | INFO("stored saved_nic #%d idx %d name %s", conf->num_savednics, |
7b35f3d6 SH |
769 | conf->saved_nics[conf->num_savednics].ifindex, |
770 | conf->saved_nics[conf->num_savednics].orig_name); | |
771 | conf->num_savednics++; | |
772 | } | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
74a3920a | 777 | static int lxc_spawn(struct lxc_handler *handler) |
59eb99ba | 778 | { |
b98f7d6e | 779 | int failed_before_rename = 0; |
ffe1e01a | 780 | const char *name = handler->name; |
7e4dfe0b | 781 | bool cgroups_connected = false; |
9f30a190 MM |
782 | int saved_ns_fd[LXC_NS_MAX]; |
783 | int preserve_mask = 0, i; | |
658979c5 | 784 | int netpipepair[2], nveths; |
9f30a190 | 785 | |
2f2623ec SH |
786 | netpipe = -1; |
787 | ||
9f30a190 | 788 | for (i = 0; i < LXC_NS_MAX; i++) |
6c544cb3 | 789 | if (handler->conf->inherit_ns_fd[i] != -1) |
9f30a190 | 790 | preserve_mask |= ns_info[i].clone_flag; |
50e98013 | 791 | |
3c22086f | 792 | if (lxc_sync_init(handler)) |
9d7f9e52 | 793 | return -1; |
0ad19a3f | 794 | |
6c544cb3 | 795 | handler->clone_flags = CLONE_NEWPID|CLONE_NEWNS; |
f6d3e3e4 SH |
796 | if (!lxc_list_empty(&handler->conf->id_map)) { |
797 | INFO("Cloning a new user namespace"); | |
798 | handler->clone_flags |= CLONE_NEWUSER; | |
799 | } | |
0ad19a3f | 800 | |
9f30a190 | 801 | if (handler->conf->inherit_ns_fd[LXC_NS_NET] == -1) { |
26b797f3 | 802 | if (!lxc_requests_empty_network(handler)) |
9f30a190 MM |
803 | handler->clone_flags |= CLONE_NEWNET; |
804 | ||
26b797f3 SH |
805 | if (!lxc_list_empty(&handler->conf->network)) { |
806 | ||
9f30a190 MM |
807 | /* Find gateway addresses from the link device, which is |
808 | * no longer accessible inside the container. Do this | |
809 | * before creating network interfaces, since goto | |
810 | * out_delete_net does not work before lxc_clone. */ | |
811 | if (lxc_find_gateway_addresses(handler)) { | |
812 | ERROR("failed to find gateway addresses"); | |
813 | lxc_sync_fini(handler); | |
814 | return -1; | |
815 | } | |
816 | ||
817 | /* that should be done before the clone because we will | |
818 | * fill the netdev index and use them in the child | |
819 | */ | |
820 | if (lxc_create_network(handler)) { | |
38521a3b | 821 | ERROR("failed to create the network"); |
9f30a190 MM |
822 | lxc_sync_fini(handler); |
823 | return -1; | |
824 | } | |
19a26f82 MK |
825 | } |
826 | ||
9f30a190 MM |
827 | if (save_phys_nics(handler->conf)) { |
828 | ERROR("failed to save physical nic info"); | |
829 | goto out_abort; | |
82d5ae15 | 830 | } |
9f30a190 MM |
831 | } else { |
832 | INFO("Inheriting a net namespace"); | |
82d5ae15 DL |
833 | } |
834 | ||
3c93577b MM |
835 | if (handler->conf->inherit_ns_fd[LXC_NS_IPC] == -1) { |
836 | handler->clone_flags |= CLONE_NEWIPC; | |
837 | } else { | |
838 | INFO("Inheriting an IPC namespace"); | |
7b35f3d6 SH |
839 | } |
840 | ||
6c544cb3 MM |
841 | if (handler->conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
842 | handler->clone_flags |= CLONE_NEWUTS; | |
843 | } else { | |
844 | INFO("Inheriting a UTS namespace"); | |
845 | } | |
846 | ||
7b35f3d6 | 847 | |
d4ef7c50 SH |
848 | if (!cgroup_init(handler)) { |
849 | ERROR("failed initializing cgroup support"); | |
33ad9f1a CS |
850 | goto out_delete_net; |
851 | } | |
852 | ||
7e4dfe0b SH |
853 | cgroups_connected = true; |
854 | ||
d4ef7c50 SH |
855 | if (!cgroup_create(handler)) { |
856 | ERROR("failed creating cgroups"); | |
47d8fb3b CS |
857 | goto out_delete_net; |
858 | } | |
859 | ||
0c547523 SH |
860 | /* |
861 | * if the rootfs is not a blockdev, prevent the container from | |
862 | * marking it readonly. | |
5e32a990 ÇO |
863 | * |
864 | * if the container is unprivileged then skip rootfs pinning | |
0c547523 | 865 | */ |
5e32a990 ÇO |
866 | if (lxc_list_empty(&handler->conf->id_map)) { |
867 | handler->pinfd = pin_rootfs(handler->conf->rootfs.path); | |
868 | if (handler->pinfd == -1) | |
869 | INFO("failed to pin the container's rootfs"); | |
870 | } | |
0c547523 | 871 | |
cd43d2d1 SH |
872 | if (preserve_ns(saved_ns_fd, preserve_mask) < 0) |
873 | goto out_delete_net; | |
874 | if (attach_ns(handler->conf->inherit_ns_fd) < 0) | |
875 | goto out_delete_net; | |
9f30a190 | 876 | |
658979c5 SH |
877 | if (am_unpriv() && (nveths = count_veths(&handler->conf->network))) { |
878 | if (pipe(netpipepair) < 0) { | |
879 | SYSERROR("Error creating pipe"); | |
880 | goto out_delete_net; | |
881 | } | |
882 | /* store netpipe in the global var for do_start's use */ | |
883 | netpipe = netpipepair[0]; | |
884 | } | |
885 | ||
0ad19a3f | 886 | /* Create a process in a new set of namespaces */ |
d5088cf2 | 887 | handler->pid = lxc_clone(do_start, handler, handler->clone_flags); |
59eb99ba | 888 | if (handler->pid < 0) { |
36eb9bde | 889 | SYSERROR("failed to fork into a new namespace"); |
7fef7a06 | 890 | goto out_delete_net; |
0ad19a3f | 891 | } |
892 | ||
cd43d2d1 SH |
893 | if (attach_ns(saved_ns_fd)) |
894 | WARN("failed to restore saved namespaces"); | |
9f30a190 | 895 | |
3c22086f CLG |
896 | lxc_sync_fini_child(handler); |
897 | ||
898 | if (lxc_sync_wait_child(handler, LXC_SYNC_CONFIGURE)) | |
99a6af52 | 899 | failed_before_rename = 1; |
0ad19a3f | 900 | |
d4ef7c50 SH |
901 | if (!cgroup_create_legacy(handler)) { |
902 | ERROR("failed to setup the legacy cgroups for %s", name); | |
ae5c8b8e | 903 | goto out_delete_net; |
33ad9f1a | 904 | } |
9daf6f5d SH |
905 | if (!cgroup_setup_limits(handler, false)) { |
906 | ERROR("failed to setup the cgroup limits for '%s'", name); | |
6031a6e5 DE |
907 | goto out_delete_net; |
908 | } | |
909 | ||
d4ef7c50 | 910 | if (!cgroup_enter(handler)) |
7fef7a06 | 911 | goto out_delete_net; |
218d4250 | 912 | |
0996e18a SH |
913 | if (!cgroup_chown(handler)) |
914 | goto out_delete_net; | |
915 | ||
99a6af52 MN |
916 | if (failed_before_rename) |
917 | goto out_delete_net; | |
918 | ||
0ad19a3f | 919 | /* Create the network configuration */ |
d5088cf2 | 920 | if (handler->clone_flags & CLONE_NEWNET) { |
fae349da | 921 | if (lxc_assign_network(&handler->conf->network, handler->pid)) { |
82d5ae15 | 922 | ERROR("failed to create the configured network"); |
7fef7a06 | 923 | goto out_delete_net; |
82d5ae15 | 924 | } |
0ad19a3f | 925 | } |
926 | ||
658979c5 SH |
927 | if (netpipe != -1) { |
928 | struct lxc_list *iterator; | |
929 | struct lxc_netdev *netdev; | |
930 | ||
931 | close(netpipe); | |
932 | lxc_list_for_each(iterator, &handler->conf->network) { | |
933 | netdev = iterator->elem; | |
934 | if (netdev->type != LXC_NET_VETH) | |
935 | continue; | |
936 | if (write(netpipepair[1], netdev->name, IFNAMSIZ) != IFNAMSIZ) { | |
937 | ERROR("Error writing veth name to container"); | |
938 | goto out_delete_net; | |
939 | } | |
940 | } | |
941 | close(netpipepair[1]); | |
942 | } | |
943 | ||
f6d3e3e4 SH |
944 | /* map the container uids - the container became an invalid |
945 | * userid the moment it was cloned with CLONE_NEWUSER - this | |
946 | * call doesn't change anything immediately, but allows the | |
947 | * container to setuid(0) (0 being mapped to something else on | |
948 | * the host) later to become a valid uid again */ | |
949 | if (lxc_map_ids(&handler->conf->id_map, handler->pid)) { | |
950 | ERROR("failed to set up id mapping"); | |
951 | goto out_delete_net; | |
952 | } | |
953 | ||
544a48a0 SH |
954 | /* Tell the child to continue its initialization. we'll get |
955 | * LXC_SYNC_CGROUP when it is ready for us to setup cgroups | |
3c22086f CLG |
956 | */ |
957 | if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CONFIGURE)) | |
544a48a0 SH |
958 | goto out_delete_net; |
959 | ||
9daf6f5d | 960 | if (!cgroup_setup_limits(handler, true)) { |
b98f7d6e SH |
961 | ERROR("failed to setup the devices cgroup for '%s'", name); |
962 | goto out_delete_net; | |
544a48a0 SH |
963 | } |
964 | ||
73d28d42 | 965 | cgroup_disconnect(); |
7e4dfe0b | 966 | cgroups_connected = false; |
73d28d42 | 967 | |
544a48a0 SH |
968 | /* Tell the child to complete its initialization and wait for |
969 | * it to exec or return an error. (the child will never | |
970 | * return LXC_SYNC_POST_CGROUP+1. It will either close the | |
971 | * sync pipe, causing lxc_sync_barrier_child to return | |
972 | * success, or return a different value, causing us to error | |
973 | * out). | |
974 | */ | |
975 | if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CGROUP)) | |
3c22086f | 976 | return -1; |
0ad19a3f | 977 | |
cc28d0b0 SH |
978 | if (detect_shared_rootfs()) |
979 | umount2(handler->conf->rootfs.mount, MNT_DETACH); | |
980 | ||
23c53af9 | 981 | if (handler->ops->post_start(handler, handler->data)) |
e6126dbe MN |
982 | goto out_abort; |
983 | ||
25c2aca5 | 984 | if (lxc_set_state(name, handler, RUNNING)) { |
59eb99ba DL |
985 | ERROR("failed to set state to %s", |
986 | lxc_state2str(RUNNING)); | |
987 | goto out_abort; | |
3f21c114 | 988 | } |
22ebac19 | 989 | |
3c22086f | 990 | lxc_sync_fini(handler); |
0c547523 | 991 | |
e6126dbe | 992 | return 0; |
1ac470c0 | 993 | |
7fef7a06 | 994 | out_delete_net: |
7e4dfe0b SH |
995 | if (cgroups_connected) |
996 | cgroup_disconnect(); | |
d5088cf2 | 997 | if (handler->clone_flags & CLONE_NEWNET) |
74a2b586 | 998 | lxc_delete_network(handler); |
59eb99ba DL |
999 | out_abort: |
1000 | lxc_abort(name, handler); | |
3c22086f | 1001 | lxc_sync_fini(handler); |
5c068da9 SH |
1002 | if (handler->pinfd >= 0) { |
1003 | close(handler->pinfd); | |
1004 | handler->pinfd = -1; | |
1005 | } | |
1006 | ||
b79fcd86 | 1007 | return -1; |
59eb99ba | 1008 | } |
0ad19a3f | 1009 | |
2af6bd1b SH |
1010 | int get_netns_fd(int pid) |
1011 | { | |
1012 | char path[MAXPATHLEN]; | |
1013 | int ret, fd; | |
1014 | ||
1015 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/ns/net", pid); | |
1016 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1017 | WARN("Failed to pin netns file for pid %d", pid); | |
1018 | return -1; | |
1019 | } | |
1020 | ||
1021 | fd = open(path, O_RDONLY); | |
1022 | if (fd < 0) { | |
1023 | WARN("Failed to pin netns file %s for pid %d: %s", | |
1024 | path, pid, strerror(errno)); | |
1025 | return -1; | |
1026 | } | |
1027 | return fd; | |
1028 | } | |
1029 | ||
ee70bf78 | 1030 | int __lxc_start(const char *name, struct lxc_conf *conf, |
13f5be62 | 1031 | struct lxc_operations* ops, void *data, const char *lxcpath) |
59eb99ba | 1032 | { |
3a0f472d | 1033 | struct lxc_handler *handler; |
e043236e | 1034 | int err = -1; |
59eb99ba | 1035 | int status; |
2af6bd1b | 1036 | int netnsfd = -1; |
80090207 | 1037 | |
13f5be62 | 1038 | handler = lxc_init(name, conf, lxcpath); |
3a0f472d | 1039 | if (!handler) { |
59eb99ba | 1040 | ERROR("failed to initialize the container"); |
66aeffc7 | 1041 | return -1; |
0ad19a3f | 1042 | } |
ee70bf78 CLG |
1043 | handler->ops = ops; |
1044 | handler->data = data; | |
e6126dbe | 1045 | |
b60ed720 | 1046 | if (must_drop_cap_sys_boot(handler->conf)) { |
495d2046 | 1047 | #if HAVE_SYS_CAPABILITY_H |
959aee9c | 1048 | DEBUG("Dropping cap_sys_boot"); |
495d2046 | 1049 | #else |
959aee9c | 1050 | DEBUG("Can't drop cap_sys_boot as capabilities aren't supported"); |
495d2046 | 1051 | #endif |
69182a31 | 1052 | } else { |
959aee9c | 1053 | DEBUG("Not dropping cap_sys_boot or watching utmp"); |
69182a31 SH |
1054 | handler->conf->need_utmp_watch = 0; |
1055 | } | |
1056 | ||
23c53af9 | 1057 | err = lxc_spawn(handler); |
59eb99ba | 1058 | if (err) { |
ee70bf78 | 1059 | ERROR("failed to spawn '%s'", name); |
74a2b586 | 1060 | goto out_fini_nonet; |
0ad19a3f | 1061 | } |
1062 | ||
2af6bd1b SH |
1063 | netnsfd = get_netns_fd(handler->pid); |
1064 | ||
3a0f472d | 1065 | err = lxc_poll(name, handler); |
e043236e | 1066 | if (err) { |
59eb99ba | 1067 | ERROR("mainloop exited with an error"); |
4b2f98f5 SH |
1068 | if (netnsfd >= 0) |
1069 | close(netnsfd); | |
59eb99ba DL |
1070 | goto out_abort; |
1071 | } | |
0ad19a3f | 1072 | |
3a0f472d | 1073 | while (waitpid(handler->pid, &status, 0) < 0 && errno == EINTR) |
1bc5cc8c | 1074 | continue; |
e043236e | 1075 | |
8b004f07 SH |
1076 | /* |
1077 | * If the child process exited but was not signaled, | |
1078 | * it didn't call reboot. This should mean it was an | |
1079 | * lxc-execute which simply exited. In any case, treat | |
1080 | * it as a 'halt' | |
1081 | */ | |
1082 | if (WIFSIGNALED(status)) { | |
1083 | switch(WTERMSIG(status)) { | |
1084 | case SIGINT: /* halt */ | |
1085 | DEBUG("Container halting"); | |
1086 | break; | |
1087 | case SIGHUP: /* reboot */ | |
1088 | DEBUG("Container rebooting"); | |
1089 | handler->conf->reboot = 1; | |
1090 | break; | |
c2b9bd9e SH |
1091 | case SIGSYS: /* seccomp */ |
1092 | DEBUG("Container violated its seccomp policy"); | |
1093 | break; | |
8b004f07 | 1094 | default: |
959aee9c | 1095 | DEBUG("unknown exit status for init: %d", WTERMSIG(status)); |
8b004f07 SH |
1096 | break; |
1097 | } | |
828695d9 SH |
1098 | } |
1099 | ||
2af6bd1b | 1100 | lxc_rename_phys_nics_on_shutdown(netnsfd, handler->conf); |
4b2f98f5 SH |
1101 | if (netnsfd >= 0) |
1102 | close(netnsfd); | |
7b35f3d6 | 1103 | |
5c068da9 SH |
1104 | if (handler->pinfd >= 0) { |
1105 | close(handler->pinfd); | |
1106 | handler->pinfd = -1; | |
1107 | } | |
1108 | ||
3a0f472d | 1109 | err = lxc_error_set_and_log(handler->pid, status); |
9d7f9e52 | 1110 | out_fini: |
74a2b586 JK |
1111 | lxc_delete_network(handler); |
1112 | ||
1113 | out_fini_nonet: | |
3a0f472d | 1114 | lxc_fini(name, handler); |
0ad19a3f | 1115 | return err; |
1116 | ||
59eb99ba | 1117 | out_abort: |
3a0f472d | 1118 | lxc_abort(name, handler); |
9d7f9e52 | 1119 | goto out_fini; |
0ad19a3f | 1120 | } |
ee70bf78 CLG |
1121 | |
1122 | struct start_args { | |
1123 | char *const *argv; | |
1124 | }; | |
1125 | ||
1126 | static int start(struct lxc_handler *handler, void* data) | |
1127 | { | |
1128 | struct start_args *arg = data; | |
1129 | ||
1130 | NOTICE("exec'ing '%s'", arg->argv[0]); | |
1131 | ||
1132 | execvp(arg->argv[0], arg->argv); | |
1133 | SYSERROR("failed to exec %s", arg->argv[0]); | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static int post_start(struct lxc_handler *handler, void* data) | |
1138 | { | |
1139 | struct start_args *arg = data; | |
1140 | ||
1141 | NOTICE("'%s' started with pid '%d'", arg->argv[0], handler->pid); | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static struct lxc_operations start_ops = { | |
1146 | .start = start, | |
1147 | .post_start = post_start | |
1148 | }; | |
1149 | ||
13f5be62 SH |
1150 | int lxc_start(const char *name, char *const argv[], struct lxc_conf *conf, |
1151 | const char *lxcpath) | |
ee70bf78 CLG |
1152 | { |
1153 | struct start_args start_arg = { | |
1154 | .argv = argv, | |
1155 | }; | |
1156 | ||
71a606ee ÇO |
1157 | if (lxc_check_inherited(conf, -1)) |
1158 | return -1; | |
1159 | ||
828695d9 | 1160 | conf->need_utmp_watch = 1; |
13f5be62 | 1161 | return __lxc_start(name, conf, &start_ops, &start_arg, lxcpath); |
ee70bf78 | 1162 | } |