]>
git.proxmox.com Git - mirror_lxc.git/blob - src/lxc/start.c
2 * lxc: linux Container library
4 * (C) Copyright IBM Corp. 2007, 2008
7 * Daniel Lezcano <daniel.lezcano at free.fr>
8 * Serge Hallyn <serge@hallyn.com>
9 * Christian Brauner <christian.brauner@ubuntu.com>
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.
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.
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
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
41 #include <sys/mount.h>
42 #include <sys/param.h>
43 #include <sys/prctl.h>
44 #include <sys/socket.h>
46 #include <sys/syscall.h>
47 #include <sys/types.h>
52 #include <sys/capability.h>
55 #if !HAVE_DECL_PR_CAPBSET_DROP
56 #define PR_CAPBSET_DROP 24
59 #if !HAVE_DECL_PR_SET_NO_NEW_PRIVS
60 #define PR_SET_NO_NEW_PRIVS 38
63 #if !HAVE_DECL_PR_GET_NO_NEW_PRIVS
64 #define PR_GET_NO_NEW_PRIVS 39
71 #include "commands_utils.h"
73 #include "confile_utils.h"
78 #include "lxccontainer.h"
80 #include "lxcseccomp.h"
83 #include "namespace.h"
87 #include "storage_utils.h"
92 lxc_log_define(lxc_start
, lxc
);
94 extern void mod_all_rdeps(struct lxc_container
*c
, bool inc
);
95 static bool do_destroy_container(struct lxc_handler
*handler
);
96 static int lxc_rmdir_onedev_wrapper(void *data
);
97 static void lxc_destroy_container_on_signal(struct lxc_handler
*handler
,
100 static void print_top_failing_dir(const char *path
)
102 size_t len
= strlen(path
);
103 char *copy
= alloca(len
+ 1), *p
, *e
, saved
;
109 while (p
< e
&& *p
== '/')
111 while (p
< e
&& *p
!= '/')
115 if (access(copy
, X_OK
)) {
116 SYSERROR("Could not access %s. Please grant it x "
117 "access, or add an ACL for the container "
125 static void close_ns(int ns_fd
[LXC_NS_MAX
])
129 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
137 /* preserve_ns: open /proc/@pid/ns/@ns for each namespace specified
139 * Return true on success, false on failure.
141 static bool preserve_ns(int ns_fd
[LXC_NS_MAX
], int clone_flags
, pid_t pid
)
145 for (i
= 0; i
< LXC_NS_MAX
; i
++)
148 ret
= lxc_preserve_ns(pid
, "");
150 SYSERROR("Kernel does not support attaching to namespaces.");
156 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
157 if ((clone_flags
& ns_info
[i
].clone_flag
) == 0)
160 ns_fd
[i
] = lxc_preserve_ns(pid
, ns_info
[i
].proc_name
);
164 DEBUG("Preserved %s namespace via fd %d", ns_info
[i
].proc_name
, ns_fd
[i
]);
171 SYSERROR("Kernel does not support attaching to %s namespaces.", ns_info
[i
].proc_name
);
173 SYSERROR("Failed to open file descriptor for %s namespace: %s.", ns_info
[i
].proc_name
, strerror(errno
));
178 static int match_fd(int fd
)
180 return (fd
== 0 || fd
== 1 || fd
== 2);
183 int lxc_check_inherited(struct lxc_conf
*conf
, bool closeall
,
184 int *fds_to_ignore
, size_t len_fds
)
186 struct dirent
*direntp
;
191 if (conf
&& conf
->close_all_fds
)
195 dir
= opendir("/proc/self/fd");
197 WARN("Failed to open directory: %s.", strerror(errno
));
203 while ((direntp
= readdir(dir
))) {
204 struct lxc_list
*cur
;
205 bool matched
= false;
207 if (!strcmp(direntp
->d_name
, "."))
210 if (!strcmp(direntp
->d_name
, ".."))
213 if (lxc_safe_int(direntp
->d_name
, &fd
) < 0) {
214 INFO("Could not parse file descriptor for: %s", direntp
->d_name
);
218 for (i
= 0; i
< len_fds
; i
++)
219 if (fds_to_ignore
[i
] == fd
)
222 if (fd
== fddir
|| fd
== lxc_log_fd
||
223 (i
< len_fds
&& fd
== fds_to_ignore
[i
]))
226 /* Keep state clients that wait on reboots. */
228 lxc_list_for_each(cur
, &conf
->state_clients
) {
229 struct lxc_state_client
*client
= cur
->elem
;
231 if (client
->clientfd
!= fd
)
242 if (current_config
&& fd
== current_config
->logfd
)
251 INFO("Closed inherited fd %d", fd
);
254 WARN("Inherited fd %d", fd
);
257 /* Only enable syslog at this point to avoid the above logging function
258 * to open a new fd and make the check_inherited function enter an
261 lxc_log_enable_syslog();
263 closedir(dir
); /* cannot fail */
267 static int setup_signal_fd(sigset_t
*oldmask
)
271 int signals
[] = {SIGBUS
, SIGILL
, SIGSEGV
, SIGWINCH
};
273 /* Block everything except serious error signals. */
274 ret
= sigfillset(&mask
);
278 for (sig
= 0; sig
< (sizeof(signals
) / sizeof(signals
[0])); sig
++) {
279 ret
= sigdelset(&mask
, signals
[sig
]);
284 ret
= sigprocmask(SIG_BLOCK
, &mask
, oldmask
);
286 SYSERROR("Failed to set signal mask");
290 ret
= signalfd(-1, &mask
, SFD_CLOEXEC
);
292 SYSERROR("Failed to create signal file descriptor");
296 TRACE("Created signal file descriptor %d", ret
);
301 static int signal_handler(int fd
, uint32_t events
, void *data
,
302 struct lxc_epoll_descr
*descr
)
306 struct signalfd_siginfo siginfo
;
307 struct lxc_handler
*hdlr
= data
;
309 ret
= read(fd
, &siginfo
, sizeof(siginfo
));
311 ERROR("Failed to read signal info from signal file descriptor: %d.", fd
);
315 if (ret
!= sizeof(siginfo
)) {
316 ERROR("Unexpected size for siginfo struct.");
320 /* Check whether init is running. */
322 ret
= waitid(P_PID
, hdlr
->pid
, &info
, WEXITED
| WNOWAIT
| WNOHANG
);
323 if (ret
== 0 && info
.si_pid
== hdlr
->pid
)
324 hdlr
->init_died
= true;
326 /* Try to figure out a reasonable exit status to report. */
327 if (hdlr
->init_died
) {
328 switch (info
.si_code
) {
330 hdlr
->exit_status
= info
.si_status
<< 8;
335 hdlr
->exit_status
= info
.si_status
<< 8 | 0x7f;
338 /* Huh? The waitid() told us it's dead *and* continued? */
339 WARN("Init %d dead and continued?", hdlr
->pid
);
340 hdlr
->exit_status
= 1;
343 ERROR("Unknown si_code: %d", hdlr
->init_died
);
344 hdlr
->exit_status
= 1;
348 if (siginfo
.ssi_signo
== SIGHUP
) {
349 kill(hdlr
->pid
, SIGTERM
);
350 INFO("Killing %d since terminal hung up", hdlr
->pid
);
351 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
354 /* More robustness, protect ourself from a SIGCHLD sent
355 * by a process different from the container init.
357 if (siginfo
.ssi_pid
!= hdlr
->pid
) {
358 NOTICE("Received %d from pid %d instead of container init %d.", siginfo
.ssi_signo
, siginfo
.ssi_pid
, hdlr
->pid
);
359 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
362 if (siginfo
.ssi_signo
!= SIGCHLD
) {
363 kill(hdlr
->pid
, siginfo
.ssi_signo
);
364 INFO("Forwarded signal %d to pid %d.", siginfo
.ssi_signo
, hdlr
->pid
);
365 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
368 if (siginfo
.ssi_code
== CLD_STOPPED
) {
369 INFO("Container init process was stopped.");
370 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
371 } else if (siginfo
.ssi_code
== CLD_CONTINUED
) {
372 INFO("Container init process was continued.");
373 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
376 DEBUG("Container init process %d exited.", hdlr
->pid
);
377 return LXC_MAINLOOP_CLOSE
;
380 int lxc_serve_state_clients(const char *name
, struct lxc_handler
*handler
,
384 struct lxc_list
*cur
, *next
;
385 struct lxc_state_client
*client
;
386 struct lxc_msg msg
= {.type
= lxc_msg_state
, .value
= state
};
390 handler
->state
= RUNNING
;
392 handler
->state
= state
;
394 TRACE("Set container state to %s", lxc_state2str(state
));
396 if (lxc_list_empty(&handler
->conf
->state_clients
)) {
397 TRACE("No state clients registered");
399 lxc_monitor_send_state(name
, state
, handler
->lxcpath
);
403 strncpy(msg
.name
, name
, sizeof(msg
.name
));
404 msg
.name
[sizeof(msg
.name
) - 1] = 0;
406 lxc_list_for_each_safe(cur
, &handler
->conf
->state_clients
, next
) {
409 if (client
->states
[state
] == 0) {
410 TRACE("State %s not registered for state client %d",
411 lxc_state2str(state
), client
->clientfd
);
415 TRACE("Sending state %s to state client %d",
416 lxc_state2str(state
), client
->clientfd
);
419 ret
= send(client
->clientfd
, &msg
, sizeof(msg
), 0);
421 if (errno
== EINTR
) {
422 TRACE("Caught EINTR; retrying");
426 ERROR("%s - Failed to send message to client",
430 /* kick client from list */
431 close(client
->clientfd
);
441 static int lxc_serve_state_socket_pair(const char *name
,
442 struct lxc_handler
*handler
,
447 if (!handler
->backgrounded
||
448 handler
->state_socket_pair
[1] < 0 ||
452 /* Close read end of the socket pair. */
453 close(handler
->state_socket_pair
[0]);
454 handler
->state_socket_pair
[0] = -1;
457 ret
= lxc_abstract_unix_send_credential(handler
->state_socket_pair
[1],
458 &(int){state
}, sizeof(int));
459 if (ret
!= sizeof(int)) {
462 SYSERROR("Failed to send state to %d",
463 handler
->state_socket_pair
[1]);
467 TRACE("Sent container state \"%s\" to %d", lxc_state2str(state
),
468 handler
->state_socket_pair
[1]);
470 /* Close write end of the socket pair. */
471 close(handler
->state_socket_pair
[1]);
472 handler
->state_socket_pair
[1] = -1;
477 int lxc_set_state(const char *name
, struct lxc_handler
*handler
,
482 ret
= lxc_serve_state_socket_pair(name
, handler
, state
);
484 ERROR("Failed to synchronize via anonymous pair of unix sockets");
488 ret
= lxc_serve_state_clients(name
, handler
, state
);
492 /* This function will try to connect to the legacy lxc-monitord state
493 * server and only exists for backwards compatibility.
495 lxc_monitor_send_state(name
, state
, handler
->lxcpath
);
500 int lxc_poll(const char *name
, struct lxc_handler
*handler
)
503 bool has_console
= true;
504 struct lxc_epoll_descr descr
, descr_console
;
506 if (handler
->conf
->console
.path
&& !strcmp(handler
->conf
->console
.path
, "none"))
509 ret
= lxc_mainloop_open(&descr
);
511 ERROR("Failed to create mainloop");
516 ret
= lxc_mainloop_open(&descr_console
);
518 ERROR("Failed to create console mainloop");
523 ret
= lxc_mainloop_add_handler(&descr
, handler
->sigfd
, signal_handler
, handler
);
525 ERROR("Failed to add signal handler for %d to mainloop", handler
->sigfd
);
526 goto out_mainloop_console
;
530 struct lxc_console
*console
= &handler
->conf
->console
;
532 ret
= lxc_console_mainloop_add(&descr
, console
);
534 ERROR("Failed to add console handlers to mainloop");
535 goto out_mainloop_console
;
538 ret
= lxc_console_mainloop_add(&descr_console
, console
);
540 ERROR("Failed to add console handlers to console mainloop");
541 goto out_mainloop_console
;
545 ret
= lxc_cmd_mainloop_add(name
, &descr
, handler
);
547 ERROR("Failed to add command handler to mainloop");
548 goto out_mainloop_console
;
551 TRACE("Mainloop is ready");
553 ret
= lxc_mainloop(&descr
, -1);
556 if (ret
< 0 || !handler
->init_died
)
557 goto out_mainloop_console
;
560 ret
= lxc_mainloop(&descr_console
, 0);
562 out_mainloop_console
:
564 lxc_mainloop_close(&descr_console
);
565 TRACE("Closed console mainloop");
569 lxc_mainloop_close(&descr
);
570 TRACE("Closed mainloop");
573 close(handler
->sigfd
);
574 TRACE("Closed signal file descriptor %d", handler
->sigfd
);
575 handler
->sigfd
= -EBADF
;
580 void lxc_zero_handler(struct lxc_handler
*handler
)
584 memset(handler
, 0, sizeof(struct lxc_handler
));
586 handler
->clone_flags
= -1;
592 for (i
= 0; i
< LXC_NS_MAX
; i
++)
593 handler
->nsfd
[i
] = -1;
595 handler
->data_sock
[0] = -1;
596 handler
->data_sock
[1] = -1;
598 handler
->state_socket_pair
[0] = -1;
599 handler
->state_socket_pair
[1] = -1;
601 handler
->sync_sock
[0] = -1;
602 handler
->sync_sock
[1] = -1;
605 static void lxc_put_nsfds(struct lxc_handler
*handler
)
609 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
610 if (handler
->nsfd
[i
] < 0)
613 close(handler
->nsfd
[i
]);
614 handler
->nsfd
[i
] = -EBADF
;
618 void lxc_free_handler(struct lxc_handler
*handler
)
620 if (handler
->pinfd
>= 0)
621 close(handler
->pinfd
);
623 if (handler
->sigfd
>= 0)
624 close(handler
->sigfd
);
626 lxc_put_nsfds(handler
);
628 if (handler
->conf
&& handler
->conf
->reboot
== 0)
629 if (handler
->conf
->maincmd_fd
)
630 close(handler
->conf
->maincmd_fd
);
632 if (handler
->state_socket_pair
[0] >= 0)
633 close(handler
->state_socket_pair
[0]);
635 if (handler
->state_socket_pair
[1] >= 0)
636 close(handler
->state_socket_pair
[1]);
638 handler
->conf
= NULL
;
643 struct lxc_handler
*lxc_init_handler(const char *name
, struct lxc_conf
*conf
,
644 const char *lxcpath
, bool daemonize
)
647 struct lxc_handler
*handler
;
649 handler
= malloc(sizeof(*handler
));
651 ERROR("failed to allocate memory");
655 memset(handler
, 0, sizeof(*handler
));
657 /* Note that am_guest_unpriv() checks the effective uid. We probably don't
658 * care if we are real root only if we are running as root so this
661 handler
->am_root
= !am_guest_unpriv();
662 handler
->data_sock
[0] = handler
->data_sock
[1] = -1;
663 handler
->conf
= conf
;
664 handler
->lxcpath
= lxcpath
;
666 handler
->sigfd
= -EBADF
;
667 handler
->init_died
= false;
668 handler
->state_socket_pair
[0] = handler
->state_socket_pair
[1] = -1;
669 if (handler
->conf
->reboot
== 0)
670 lxc_list_init(&handler
->conf
->state_clients
);
672 for (i
= 0; i
< LXC_NS_MAX
; i
++)
673 handler
->nsfd
[i
] = -1;
675 handler
->name
= name
;
677 if (daemonize
&& !handler
->conf
->reboot
) {
678 /* Create socketpair() to synchronize on daemonized startup.
679 * When the container reboots we don't need to synchronize again
680 * currently so don't open another socketpair().
682 ret
= socketpair(AF_UNIX
, SOCK_STREAM
| SOCK_CLOEXEC
, 0,
683 handler
->state_socket_pair
);
685 ERROR("Failed to create anonymous pair of unix sockets");
688 TRACE("Created anonymous pair {%d,%d} of unix sockets",
689 handler
->state_socket_pair
[0],
690 handler
->state_socket_pair
[1]);
693 if (handler
->conf
->reboot
== 0) {
694 handler
->conf
->maincmd_fd
= lxc_cmd_init(name
, lxcpath
, "command");
695 if (handler
->conf
->maincmd_fd
< 0) {
696 ERROR("Failed to set up command socket");
700 TRACE("Unix domain socket %d for command server is ready",
701 handler
->conf
->maincmd_fd
);
706 lxc_free_handler(handler
);
711 int lxc_init(const char *name
, struct lxc_handler
*handler
)
714 const char *loglevel
;
715 struct lxc_conf
*conf
= handler
->conf
;
718 TRACE("initialized LSM");
720 if (lxc_read_seccomp_config(conf
) != 0) {
721 ERROR("Failed loading seccomp policy.");
722 goto out_close_maincmd_fd
;
724 TRACE("read seccomp policy");
726 /* Begin by setting the state to STARTING. */
727 if (lxc_set_state(name
, handler
, STARTING
)) {
728 ERROR("Failed to set state for container \"%s\" to \"%s\".", name
, lxc_state2str(STARTING
));
729 goto out_close_maincmd_fd
;
731 TRACE("set container state to \"STARTING\"");
733 /* Start of environment variable setup for hooks. */
734 if (name
&& setenv("LXC_NAME", name
, 1))
735 SYSERROR("Failed to set environment variable: LXC_NAME=%s.", name
);
737 if (conf
->rcfile
&& setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1))
738 SYSERROR("Failed to set environment variable: LXC_CONFIG_FILE=%s.", conf
->rcfile
);
740 if (conf
->rootfs
.mount
&& setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1))
741 SYSERROR("Failed to set environment variable: LXC_ROOTFS_MOUNT=%s.", conf
->rootfs
.mount
);
743 if (conf
->rootfs
.path
&& setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1))
744 SYSERROR("Failed to set environment variable: LXC_ROOTFS_PATH=%s.", conf
->rootfs
.path
);
746 if (conf
->console
.path
&& setenv("LXC_CONSOLE", conf
->console
.path
, 1))
747 SYSERROR("Failed to set environment variable: LXC_CONSOLE=%s.", conf
->console
.path
);
749 if (conf
->console
.log_path
&& setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1))
750 SYSERROR("Failed to set environment variable: LXC_CONSOLE_LOGPATH=%s.", conf
->console
.log_path
);
752 if (setenv("LXC_CGNS_AWARE", "1", 1))
753 SYSERROR("Failed to set environment variable LXC_CGNS_AWARE=1.");
755 loglevel
= lxc_log_priority_to_string(lxc_log_get_level());
756 if (setenv("LXC_LOG_LEVEL", loglevel
, 1))
757 SYSERROR("Failed to set environment variable LXC_LOG_LEVEL=%s", loglevel
);
759 if (conf
->hooks_version
== 0)
760 ret
= setenv("LXC_HOOK_VERSION", "0", 1);
762 ret
= setenv("LXC_HOOK_VERSION", "1", 1);
764 SYSERROR("Failed to set environment variable LXC_HOOK_VERSION=%u", conf
->hooks_version
);
765 /* End of environment variable setup for hooks. */
767 TRACE("set environment variables");
769 if (run_lxc_hooks(name
, "pre-start", conf
, NULL
)) {
770 ERROR("Failed to run lxc.hook.pre-start for container \"%s\".", name
);
773 TRACE("ran pre-start hooks");
775 /* The signal fd has to be created before forking otherwise if the child
776 * process exits before we setup the signal fd, the event will be lost
777 * and the command will be stuck.
779 handler
->sigfd
= setup_signal_fd(&handler
->oldmask
);
780 if (handler
->sigfd
< 0) {
781 ERROR("Failed to setup SIGCHLD fd handler.");
784 TRACE("set up signal fd");
786 /* Do this after setting up signals since it might unblock SIGWINCH. */
787 ret
= lxc_console_create(conf
);
789 ERROR("Failed to create console");
790 goto out_restore_sigmask
;
792 TRACE("Created console");
794 ret
= lxc_pty_map_ids(conf
, &conf
->console
);
796 ERROR("Failed to shift tty into container.");
797 goto out_restore_sigmask
;
799 TRACE("shifted tty ids");
801 INFO("container \"%s\" is initialized", name
);
805 sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
);
807 lxc_delete_tty(&conf
->tty_info
);
809 lxc_set_state(name
, handler
, ABORTING
);
810 out_close_maincmd_fd
:
811 close(conf
->maincmd_fd
);
812 conf
->maincmd_fd
= -1;
816 void lxc_fini(const char *name
, struct lxc_handler
*handler
)
820 struct lxc_list
*cur
, *next
;
821 char *namespaces
[LXC_NS_MAX
+ 1];
822 size_t namespace_count
= 0;
824 /* The STOPPING state is there for future cleanup code which can take
827 lxc_set_state(name
, handler
, STOPPING
);
829 self
= lxc_raw_getpid();
830 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
831 if (handler
->nsfd
[i
] < 0)
834 if (handler
->conf
->hooks_version
== 0)
835 rc
= asprintf(&namespaces
[namespace_count
],
836 "%s:/proc/%d/fd/%d", ns_info
[i
].proc_name
,
837 self
, handler
->nsfd
[i
]);
839 rc
= asprintf(&namespaces
[namespace_count
],
840 "/proc/%d/fd/%d", self
, handler
->nsfd
[i
]);
842 SYSERROR("Failed to allocate memory.");
846 if (handler
->conf
->hooks_version
== 0) {
851 rc
= setenv(ns_info
[i
].env_name
, namespaces
[namespace_count
], 1);
853 SYSERROR("Failed to set environment variable %s=%s",
854 ns_info
[i
].env_name
, namespaces
[namespace_count
]);
856 TRACE("Set environment variable %s=%s",
857 ns_info
[i
].env_name
, namespaces
[namespace_count
]);
861 namespaces
[namespace_count
] = NULL
;
863 if (handler
->conf
->reboot
&& setenv("LXC_TARGET", "reboot", 1))
864 SYSERROR("Failed to set environment variable: LXC_TARGET=reboot.");
866 if (!handler
->conf
->reboot
&& setenv("LXC_TARGET", "stop", 1))
867 SYSERROR("Failed to set environment variable: LXC_TARGET=stop.");
869 if (handler
->conf
->hooks_version
== 0)
870 rc
= run_lxc_hooks(name
, "stop", handler
->conf
, namespaces
);
872 rc
= run_lxc_hooks(name
, "stop", handler
->conf
, NULL
);
874 while (namespace_count
--)
875 free(namespaces
[namespace_count
]);
877 cgroup_destroy(handler
);
879 if (handler
->conf
->reboot
== 0) {
880 /* For all new state clients simply close the command socket.
881 * This will inform all state clients that the container is
882 * STOPPED and also prevents a race between a open()/close() on
883 * the command socket causing a new process to get ECONNREFUSED
884 * because we haven't yet closed the command socket.
886 close(handler
->conf
->maincmd_fd
);
887 handler
->conf
->maincmd_fd
= -1;
888 TRACE("Closed command socket");
890 /* This function will try to connect to the legacy lxc-monitord
891 * state server and only exists for backwards compatibility.
893 lxc_monitor_send_state(name
, STOPPED
, handler
->lxcpath
);
895 /* The command socket is closed so no one can acces the command
896 * socket anymore so there's no need to lock it.
898 handler
->state
= STOPPED
;
899 TRACE("Set container state to \"STOPPED\"");
901 lxc_set_state(name
, handler
, STOPPED
);
904 if (run_lxc_hooks(name
, "post-stop", handler
->conf
, NULL
)) {
905 ERROR("Failed to run lxc.hook.post-stop for container \"%s\".", name
);
906 if (handler
->conf
->reboot
) {
907 WARN("Container will be stopped instead of rebooted.");
908 handler
->conf
->reboot
= 0;
909 if (setenv("LXC_TARGET", "stop", 1))
910 WARN("Failed to set environment variable: LXC_TARGET=stop.");
914 /* Reset mask set by setup_signal_fd. */
915 if (sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
))
916 WARN("Failed to restore signal mask.");
918 lxc_console_delete(&handler
->conf
->console
);
919 lxc_delete_tty(&handler
->conf
->tty_info
);
921 /* The command socket is now closed, no more state clients can register
922 * themselves from now on. So free the list of state clients.
924 lxc_list_for_each_safe(cur
, &handler
->conf
->state_clients
, next
) {
925 struct lxc_state_client
*client
= cur
->elem
;
927 /* Keep state clients that want to be notified about reboots. */
928 if ((handler
->conf
->reboot
> 0) && (client
->states
[RUNNING
] == 2))
931 /* close state client socket */
932 close(client
->clientfd
);
938 if (handler
->conf
->ephemeral
== 1 && handler
->conf
->reboot
!= 1)
939 lxc_destroy_container_on_signal(handler
, name
);
941 lxc_free_handler(handler
);
944 void lxc_abort(const char *name
, struct lxc_handler
*handler
)
948 lxc_set_state(name
, handler
, ABORTING
);
949 if (handler
->pid
> 0)
950 kill(handler
->pid
, SIGKILL
);
951 while ((ret
= waitpid(-1, &status
, 0)) > 0) {
956 static int lxc_set_death_signal(int signal
)
961 ret
= prctl(PR_SET_PDEATHSIG
, signal
, 0, 0, 0);
963 /* Check whether we have been orphaned. */
964 ppid
= (pid_t
)syscall(SYS_getppid
);
968 self
= lxc_raw_getpid();
969 ret
= kill(self
, SIGKILL
);
975 SYSERROR("Failed to set PR_SET_PDEATHSIG to %d", signal
);
982 static int do_start(void *data
)
985 struct lxc_list
*iterator
;
987 struct lxc_handler
*handler
= data
;
988 bool have_cap_setgid
;
993 lxc_sync_fini_parent(handler
);
995 /* This prctl must be before the synchro, so if the parent dies before
996 * we set the parent death signal, we will detect its death with the
997 * synchro right after, otherwise we have a window where the parent can
998 * exit before we set the pdeath signal leading to a unsupervized
1001 ret
= lxc_set_death_signal(SIGKILL
);
1003 SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL");
1004 goto out_warn_father
;
1007 ret
= sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
);
1009 SYSERROR("Failed to set signal mask");
1010 goto out_warn_father
;
1013 /* Don't leak the pinfd to the container. */
1014 if (handler
->pinfd
>= 0)
1015 close(handler
->pinfd
);
1017 ret
= lxc_sync_wait_parent(handler
, LXC_SYNC_STARTUP
);
1019 goto out_warn_father
;
1021 /* Unshare CLONE_NEWNET after CLONE_NEWUSER. See
1022 * https://github.com/lxc/lxd/issues/1978.
1024 if ((handler
->clone_flags
& (CLONE_NEWNET
| CLONE_NEWUSER
)) ==
1025 (CLONE_NEWNET
| CLONE_NEWUSER
)) {
1026 ret
= unshare(CLONE_NEWNET
);
1028 SYSERROR("Failed to unshare CLONE_NEWNET.");
1029 goto out_warn_father
;
1031 INFO("Unshared CLONE_NEWNET.");
1034 /* Tell the parent task it can begin to configure the container and wait
1037 if (lxc_sync_barrier_parent(handler
, LXC_SYNC_CONFIGURE
))
1040 if (lxc_network_recv_veth_names_from_parent(handler
) < 0) {
1041 ERROR("Failed to receive veth names from parent");
1042 goto out_warn_father
;
1045 /* If we are in a new user namespace, become root there to have
1046 * privilege over our namespace.
1048 if (!lxc_list_empty(&handler
->conf
->id_map
)) {
1049 uid_t nsuid
= (handler
->conf
->root_nsuid_map
!= NULL
)
1051 : handler
->conf
->init_uid
;
1052 gid_t nsgid
= (handler
->conf
->root_nsgid_map
!= NULL
)
1054 : handler
->conf
->init_gid
;
1056 ret
= lxc_switch_uid_gid(nsuid
, nsgid
);
1058 goto out_warn_father
;
1060 /* Drop groups only after we switched to a valid gid in the new
1063 ret
= lxc_setgroups(0, NULL
);
1064 if (ret
< 0 && (handler
->am_root
|| errno
!= EPERM
))
1065 goto out_warn_father
;
1067 if (!handler
->am_root
) {
1068 ret
= prctl(PR_SET_DUMPABLE
, 1, 0, 0, 0);
1070 goto out_warn_father
;
1073 /* set{g,u}id() clears deathsignal */
1074 ret
= lxc_set_death_signal(SIGKILL
);
1076 SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL");
1077 goto out_warn_father
;
1081 if (access(handler
->lxcpath
, X_OK
)) {
1082 print_top_failing_dir(handler
->lxcpath
);
1083 goto out_warn_father
;
1086 ret
= snprintf(path
, sizeof(path
), "%s/dev/null", handler
->conf
->rootfs
.mount
);
1087 if (ret
< 0 || ret
>= sizeof(path
))
1088 goto out_warn_father
;
1090 /* In order to checkpoint restore, we need to have everything in the
1091 * same mount namespace. However, some containers may not have a
1092 * reasonable /dev (in particular, they may not have /dev/null), so we
1093 * can't set init's std fds to /dev/null by opening it from inside the
1096 * If that's the case, fall back to using the host's /dev/null. This
1097 * means that migration won't work, but at least we won't spew output
1098 * where it isn't wanted.
1100 if (handler
->backgrounded
&& !handler
->conf
->autodev
&& access(path
, F_OK
) < 0) {
1101 devnull_fd
= open_devnull();
1104 goto out_warn_father
;
1105 WARN("Using /dev/null from the host for container init's "
1106 "standard file descriptors. Migration will not work.");
1109 /* Ask father to setup cgroups and wait for him to finish. */
1110 if (lxc_sync_barrier_parent(handler
, LXC_SYNC_CGROUP
))
1113 /* Unshare cgroup namespace after we have setup our cgroups. If we do it
1114 * earlier we end up with a wrong view of /proc/self/cgroup. For
1115 * example, assume we unshare(CLONE_NEWCGROUP) first, and then create
1116 * the cgroup for the container, say /sys/fs/cgroup/cpuset/lxc/c, then
1117 * /proc/self/cgroup would show us:
1121 * whereas it should actually show
1125 if (handler
->clone_flags
& CLONE_NEWCGROUP
) {
1126 if (unshare(CLONE_NEWCGROUP
) < 0) {
1127 INFO("Failed to unshare CLONE_NEWCGROUP.");
1128 goto out_warn_father
;
1130 INFO("Unshared CLONE_NEWCGROUP.");
1133 /* Add the requested environment variables to the current environment to
1134 * allow them to be used by the various hooks, such as the start hook
1137 lxc_list_for_each(iterator
, &handler
->conf
->environment
) {
1138 if (putenv((char *)iterator
->elem
)) {
1139 SYSERROR("Failed to set environment variable: %s.", (char *)iterator
->elem
);
1140 goto out_warn_father
;
1144 /* Setup the container, ip, names, utsname, ... */
1145 ret
= lxc_setup(handler
);
1146 close(handler
->data_sock
[1]);
1147 close(handler
->data_sock
[0]);
1149 ERROR("Failed to setup container \"%s\".", handler
->name
);
1150 goto out_warn_father
;
1153 /* Set the label to change to when we exec(2) the container's init. */
1154 if (lsm_process_label_set(NULL
, handler
->conf
, 1, 1) < 0)
1155 goto out_warn_father
;
1157 /* Set PR_SET_NO_NEW_PRIVS after we changed the lsm label. If we do it
1158 * before we aren't allowed anymore.
1160 if (handler
->conf
->no_new_privs
) {
1161 if (prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0) < 0) {
1162 SYSERROR("Could not set PR_SET_NO_NEW_PRIVS to block execve() gainable privileges.");
1163 goto out_warn_father
;
1165 DEBUG("Set PR_SET_NO_NEW_PRIVS to block execve() gainable privileges.");
1168 /* Some init's such as busybox will set sane tty settings on stdin,
1169 * stdout, stderr which it thinks is the console. We already set them
1170 * the way we wanted on the real terminal, and we want init to do its
1171 * setup on its console ie. the pty allocated in lxc_console_create() so
1172 * make sure that that pty is stdin,stdout,stderr.
1174 if (handler
->conf
->console
.slave
>= 0) {
1175 if (handler
->backgrounded
|| handler
->conf
->is_execute
== 0)
1176 ret
= set_stdfds(handler
->conf
->console
.slave
);
1178 ret
= lxc_console_set_stdfds(handler
->conf
->console
.slave
);
1180 ERROR("Failed to redirect std{in,out,err} to pty file "
1182 handler
->conf
->console
.slave
);
1183 goto out_warn_father
;
1187 /* If we mounted a temporary proc, then unmount it now. */
1188 tmp_proc_unmount(handler
->conf
);
1190 if (lxc_seccomp_load(handler
->conf
) != 0)
1191 goto out_warn_father
;
1193 if (run_lxc_hooks(handler
->name
, "start", handler
->conf
, NULL
)) {
1194 ERROR("Failed to run lxc.hook.start for container \"%s\".", handler
->name
);
1195 goto out_warn_father
;
1198 close(handler
->sigfd
);
1200 if (devnull_fd
< 0) {
1201 devnull_fd
= open_devnull();
1204 goto out_warn_father
;
1207 if (handler
->conf
->console
.slave
< 0 && handler
->backgrounded
)
1208 if (set_stdfds(devnull_fd
) < 0) {
1209 ERROR("Failed to redirect std{in,out,err} to "
1211 goto out_warn_father
;
1214 if (devnull_fd
>= 0) {
1221 if (handler
->conf
->init_cwd
&& chdir(handler
->conf
->init_cwd
)) {
1222 SYSERROR("Could not change directory to \"%s\"", handler
->conf
->init_cwd
);
1223 goto out_warn_father
;
1226 if (lxc_sync_barrier_parent(handler
, LXC_SYNC_CGROUP_LIMITS
))
1227 goto out_warn_father
;
1229 /* Reset the environment variables the user requested in a clear
1233 SYSERROR("Failed to clear environment.");
1234 /* Don't error out though. */
1237 lxc_list_for_each(iterator
, &handler
->conf
->environment
) {
1238 if (putenv((char *)iterator
->elem
)) {
1239 SYSERROR("Failed to set environment variable: %s.", (char *)iterator
->elem
);
1240 goto out_warn_father
;
1244 if (putenv("container=lxc")) {
1245 SYSERROR("Failed to set environment variable: container=lxc.");
1246 goto out_warn_father
;
1249 if (handler
->conf
->pty_names
) {
1250 if (putenv(handler
->conf
->pty_names
)) {
1251 SYSERROR("Failed to set environment variable for container ptys.");
1252 goto out_warn_father
;
1256 /* The container has been setup. We can now switch to an unprivileged
1259 new_uid
= handler
->conf
->init_uid
;
1260 new_gid
= handler
->conf
->init_gid
;
1262 /* If we are in a new user namespace we already dropped all
1263 * groups when we switched to root in the new user namespace
1264 * further above. Only drop groups if we can, so ensure that we
1265 * have necessary privilege.
1268 have_cap_setgid
= lxc_proc_cap_is_set(CAP_SETGID
, CAP_EFFECTIVE
);
1270 have_cap_setgid
= false;
1272 if (lxc_list_empty(&handler
->conf
->id_map
) && have_cap_setgid
) {
1273 if (lxc_setgroups(0, NULL
) < 0)
1274 goto out_warn_father
;
1277 if (lxc_switch_uid_gid(new_uid
, new_gid
) < 0)
1278 goto out_warn_father
;
1280 /* After this call, we are in error because this ops should not return
1283 handler
->ops
->start(handler
, handler
->data
);
1286 /* We want the parent to know something went wrong, so we return a
1287 * special error code.
1289 lxc_sync_wake_parent(handler
, LXC_SYNC_ERROR
);
1292 if (devnull_fd
>= 0)
1298 static int lxc_recv_ttys_from_child(struct lxc_handler
*handler
)
1301 struct lxc_pty_info
*pty_info
;
1303 int sock
= handler
->data_sock
[1];
1304 struct lxc_conf
*conf
= handler
->conf
;
1305 struct lxc_tty_info
*tty_info
= &conf
->tty_info
;
1310 tty_info
->pty_info
= malloc(sizeof(*tty_info
->pty_info
) * conf
->tty
);
1311 if (!tty_info
->pty_info
)
1314 for (i
= 0; i
< conf
->tty
; i
++) {
1317 ret
= lxc_abstract_unix_recv_fds(sock
, ttyfds
, 2, NULL
, 0);
1321 pty_info
= &tty_info
->pty_info
[i
];
1323 pty_info
->master
= ttyfds
[0];
1324 pty_info
->slave
= ttyfds
[1];
1325 TRACE("Received pty with master fd %d and slave fd %d from "
1326 "parent", pty_info
->master
, pty_info
->slave
);
1329 ERROR("Failed to receive %d ttys from child: %s", conf
->tty
,
1332 TRACE("Received %d ttys from child", conf
->tty
);
1334 tty_info
->nbtty
= conf
->tty
;
1339 int resolve_clone_flags(struct lxc_handler
*handler
)
1342 struct lxc_conf
*conf
= handler
->conf
;
1344 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1345 if (conf
->ns_keep
!= 0) {
1346 if ((conf
->ns_keep
& ns_info
[i
].clone_flag
) == 0)
1347 handler
->clone_flags
|= ns_info
[i
].clone_flag
;
1348 } else if (conf
->ns_clone
!= 0) {
1349 if ((conf
->ns_clone
& ns_info
[i
].clone_flag
) > 0)
1350 handler
->clone_flags
|= ns_info
[i
].clone_flag
;
1352 if (i
== LXC_NS_USER
&& lxc_list_empty(&handler
->conf
->id_map
))
1355 if (i
== LXC_NS_NET
&& lxc_requests_empty_network(handler
))
1358 if (i
== LXC_NS_CGROUP
&& !cgns_supported())
1361 handler
->clone_flags
|= ns_info
[i
].clone_flag
;
1364 if (!conf
->ns_share
[i
])
1367 handler
->clone_flags
&= ~ns_info
[i
].clone_flag
;
1368 TRACE("Sharing %s namespace", ns_info
[i
].proc_name
);
1374 /* Note that this function is used with clone(CLONE_VM). Some glibc versions
1375 * used to reset the pid/tid to -1 when CLONE_VM was used without CLONE_THREAD.
1376 * But since the memory between parent and child is shared on CLONE_VM this
1377 * would invalidate the getpid() cache that glibc used to maintain and so
1378 * getpid() in the child would return the parent's pid. This is all fixed in
1379 * newer glibc versions where the getpid() cache is removed and the pid/tid is
1380 * not reset anymore.
1381 * However, if for whatever reason you - dear commiter - somehow need to get the
1382 * pid of the dummy intermediate process for do_share_ns() you need to call
1383 * lxc_raw_getpid(). The next lxc_raw_clone() call does not employ CLONE_VM and
1386 static inline int do_share_ns(void *arg
)
1389 struct lxc_handler
*handler
= arg
;
1391 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1392 if (handler
->nsfd
[i
] < 0)
1395 ret
= setns(handler
->nsfd
[i
], 0);
1399 DEBUG("Inherited %s namespace", ns_info
[i
].proc_name
);
1402 flags
= handler
->on_clone_flags
;
1403 flags
|= CLONE_PARENT
;
1404 handler
->pid
= lxc_raw_clone_cb(do_start
, handler
, flags
);
1405 if (handler
->pid
< 0)
1411 /* lxc_spawn() performs crucial setup tasks and clone()s the new process which
1412 * exec()s the requested container binary.
1413 * Note that lxc_spawn() runs in the parent namespaces. Any operations performed
1414 * right here should be double checked if they'd pose a security risk. (For
1415 * example, any {u}mount() operations performed here will be reflected on the
1418 static int lxc_spawn(struct lxc_handler
*handler
)
1422 bool wants_to_map_ids
;
1423 struct lxc_list
*id_map
;
1424 const char *name
= handler
->name
;
1425 const char *lxcpath
= handler
->lxcpath
;
1426 bool cgroups_connected
= false, share_ns
= false;
1427 struct lxc_conf
*conf
= handler
->conf
;
1429 id_map
= &conf
->id_map
;
1430 wants_to_map_ids
= !lxc_list_empty(id_map
);
1432 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1433 if (!conf
->ns_share
[i
])
1436 handler
->nsfd
[i
] = lxc_inherit_namespace(conf
->ns_share
[i
], lxcpath
, ns_info
[i
].proc_name
);
1437 if (handler
->nsfd
[i
] < 0)
1443 if (lxc_sync_init(handler
))
1446 ret
= socketpair(AF_UNIX
, SOCK_STREAM
| SOCK_CLOEXEC
, 0,
1447 handler
->data_sock
);
1449 lxc_sync_fini(handler
);
1453 ret
= resolve_clone_flags(handler
);
1455 lxc_sync_fini(handler
);
1459 if (handler
->clone_flags
& CLONE_NEWNET
) {
1460 if (!lxc_list_empty(&conf
->network
)) {
1462 /* Find gateway addresses from the link device, which is
1463 * no longer accessible inside the container. Do this
1464 * before creating network interfaces, since goto
1465 * out_delete_net does not work before lxc_clone.
1467 if (lxc_find_gateway_addresses(handler
)) {
1468 ERROR("Failed to find gateway addresses.");
1469 lxc_sync_fini(handler
);
1473 /* That should be done before the clone because we will
1474 * fill the netdev index and use them in the child.
1476 if (lxc_create_network_priv(handler
)) {
1477 ERROR("Failed to create the network.");
1478 lxc_sync_fini(handler
);
1484 if (!cgroup_init(handler
)) {
1485 ERROR("Failed initializing cgroup support.");
1486 goto out_delete_net
;
1489 cgroups_connected
= true;
1491 if (!cgroup_create(handler
)) {
1492 ERROR("Failed creating cgroups.");
1493 goto out_delete_net
;
1496 /* If the rootfs is not a blockdev, prevent the container from marking
1498 * If the container is unprivileged then skip rootfs pinning.
1500 if (!wants_to_map_ids
) {
1501 handler
->pinfd
= pin_rootfs(conf
->rootfs
.path
);
1502 if (handler
->pinfd
== -1)
1503 INFO("Failed to pin the rootfs for container \"%s\".", handler
->name
);
1506 /* Create a process in a new set of namespaces. */
1507 handler
->on_clone_flags
= handler
->clone_flags
;
1508 if (handler
->clone_flags
& CLONE_NEWUSER
) {
1509 /* If CLONE_NEWUSER and CLONE_NEWNET was requested, we need to
1510 * clone a new user namespace first and only later unshare our
1511 * network namespace to ensure that network devices ownership is
1514 handler
->on_clone_flags
&= ~CLONE_NEWNET
;
1516 /* The cgroup namespace gets unshare()ed not clone()ed. */
1517 handler
->on_clone_flags
&= ~CLONE_NEWCGROUP
;
1522 attacher_pid
= lxc_clone(do_share_ns
, handler
, CLONE_VFORK
| CLONE_VM
| CLONE_FILES
);
1523 if (attacher_pid
< 0) {
1524 SYSERROR(LXC_CLONE_ERROR
);
1525 goto out_delete_net
;
1528 ret
= wait_for_pid(attacher_pid
);
1530 SYSERROR("Intermediate process failed");
1531 goto out_delete_net
;
1534 handler
->pid
= lxc_raw_clone_cb(do_start
, handler
, handler
->on_clone_flags
);
1536 if (handler
->pid
< 0) {
1537 SYSERROR(LXC_CLONE_ERROR
);
1538 goto out_delete_net
;
1540 TRACE("Cloned child process %d", handler
->pid
);
1542 for (i
= 0; i
< LXC_NS_MAX
; i
++)
1543 if (handler
->on_clone_flags
& ns_info
[i
].clone_flag
)
1544 INFO("Cloned %s", ns_info
[i
].flag_name
);
1546 if (!preserve_ns(handler
->nsfd
, handler
->on_clone_flags
, handler
->pid
)) {
1547 ERROR("Failed to preserve cloned namespaces for lxc.hook.stop");
1548 goto out_delete_net
;
1551 lxc_sync_fini_child(handler
);
1553 /* Map the container uids. The container became an invalid userid the
1554 * moment it was cloned with CLONE_NEWUSER. This call doesn't change
1555 * anything immediately, but allows the container to setuid(0) (0 being
1556 * mapped to something else on the host.) later to become a valid uid
1559 if (wants_to_map_ids
) {
1560 if (!handler
->conf
->ns_share
[LXC_NS_USER
] ||
1561 (handler
->conf
->ns_keep
& CLONE_NEWUSER
) == 0) {
1562 ret
= lxc_map_ids(id_map
, handler
->pid
);
1564 ERROR("Failed to set up id mapping.");
1565 goto out_delete_net
;
1570 if (lxc_sync_wake_child(handler
, LXC_SYNC_STARTUP
))
1571 goto out_delete_net
;
1573 if (lxc_sync_wait_child(handler
, LXC_SYNC_CONFIGURE
))
1574 goto out_delete_net
;
1576 if (!cgroup_create_legacy(handler
)) {
1577 ERROR("Failed to setup legacy cgroups for container \"%s\".", name
);
1578 goto out_delete_net
;
1580 if (!cgroup_setup_limits(handler
, false)) {
1581 ERROR("Failed to setup cgroup limits for container \"%s\".", name
);
1582 goto out_delete_net
;
1585 if (!cgroup_enter(handler
))
1586 goto out_delete_net
;
1588 if (!cgroup_chown(handler
))
1589 goto out_delete_net
;
1591 /* Now we're ready to preserve the network namespace */
1592 ret
= lxc_preserve_ns(handler
->pid
, "net");
1594 ERROR("%s - Failed to preserve net namespace", strerror(errno
));
1595 goto out_delete_net
;
1597 handler
->nsfd
[LXC_NS_NET
] = ret
;
1598 DEBUG("Preserved net namespace via fd %d", ret
);
1600 /* Create the network configuration. */
1601 if (handler
->clone_flags
& CLONE_NEWNET
) {
1602 if (lxc_network_move_created_netdev_priv(handler
->lxcpath
,
1606 ERROR("Failed to create the configured network.");
1607 goto out_delete_net
;
1610 if (lxc_create_network_unpriv(handler
->lxcpath
, handler
->name
,
1613 ERROR("Failed to create the configured network.");
1614 goto out_delete_net
;
1618 if (lxc_network_send_veth_names_to_child(handler
) < 0) {
1619 ERROR("Failed to send veth names to child");
1620 goto out_delete_net
;
1623 if (!lxc_list_empty(&conf
->procs
)) {
1624 ret
= setup_proc_filesystem(&conf
->procs
, handler
->pid
);
1626 goto out_delete_net
;
1629 /* Tell the child to continue its initialization. We'll get
1630 * LXC_SYNC_CGROUP when it is ready for us to setup cgroups.
1632 if (lxc_sync_barrier_child(handler
, LXC_SYNC_POST_CONFIGURE
))
1633 goto out_delete_net
;
1635 if (!lxc_list_empty(&conf
->limits
) && setup_resource_limits(&conf
->limits
, handler
->pid
)) {
1636 ERROR("failed to setup resource limits for '%s'", name
);
1637 goto out_delete_net
;
1640 if (lxc_sync_barrier_child(handler
, LXC_SYNC_CGROUP_UNSHARE
))
1641 goto out_delete_net
;
1643 if (!cgroup_setup_limits(handler
, true)) {
1644 ERROR("Failed to setup the devices cgroup for container \"%s\".", name
);
1645 goto out_delete_net
;
1647 TRACE("Set up cgroup device limits");
1649 cgroup_disconnect();
1650 cgroups_connected
= false;
1652 if (handler
->clone_flags
& CLONE_NEWCGROUP
) {
1653 /* Now we're ready to preserve the cgroup namespace */
1654 ret
= lxc_preserve_ns(handler
->pid
, "cgroup");
1656 ERROR("%s - Failed to preserve cgroup namespace", strerror(errno
));
1657 goto out_delete_net
;
1659 handler
->nsfd
[LXC_NS_CGROUP
] = ret
;
1660 DEBUG("Preserved cgroup namespace via fd %d", ret
);
1663 snprintf(pidstr
, 20, "%d", handler
->pid
);
1664 if (setenv("LXC_PID", pidstr
, 1))
1665 SYSERROR("Failed to set environment variable: LXC_PID=%s.", pidstr
);
1667 /* Run any host-side start hooks */
1668 if (run_lxc_hooks(name
, "start-host", conf
, NULL
)) {
1669 ERROR("Failed to run lxc.hook.start-host for container \"%s\".", name
);
1673 /* Tell the child to complete its initialization and wait for it to exec
1674 * or return an error. (The child will never return
1675 * LXC_SYNC_READY_START+1. It will either close the sync pipe, causing
1676 * lxc_sync_barrier_child to return success, or return a different
1677 * value, causing us to error out).
1679 if (lxc_sync_barrier_child(handler
, LXC_SYNC_READY_START
))
1682 if (lxc_network_recv_name_and_ifindex_from_child(handler
) < 0) {
1683 ERROR("Failed to receive names and ifindices for network "
1684 "devices from child");
1685 goto out_delete_net
;
1688 /* Now all networks are created, network devices are moved into place,
1689 * and the correct names and ifindeces in the respective namespaces have
1690 * been recorded. The corresponding structs have now all been filled. So
1691 * log them for debugging purposes.
1693 lxc_log_configured_netdevs(conf
);
1695 /* Read tty fds allocated by child. */
1696 if (lxc_recv_ttys_from_child(handler
) < 0) {
1697 ERROR("Failed to receive tty info from child process.");
1698 goto out_delete_net
;
1701 if (handler
->ops
->post_start(handler
, handler
->data
))
1704 if (lxc_set_state(name
, handler
, RUNNING
)) {
1705 ERROR("Failed to set state for container \"%s\" to \"%s\".", name
,
1706 lxc_state2str(RUNNING
));
1710 lxc_sync_fini(handler
);
1715 if (cgroups_connected
)
1716 cgroup_disconnect();
1718 if (handler
->clone_flags
& CLONE_NEWNET
)
1719 lxc_delete_network(handler
);
1722 lxc_abort(name
, handler
);
1723 lxc_sync_fini(handler
);
1724 if (handler
->pinfd
>= 0) {
1725 close(handler
->pinfd
);
1726 handler
->pinfd
= -1;
1732 int __lxc_start(const char *name
, struct lxc_handler
*handler
,
1733 struct lxc_operations
* ops
, void *data
, const char *lxcpath
,
1738 struct lxc_conf
*conf
= handler
->conf
;
1740 if (lxc_init(name
, handler
) < 0) {
1741 ERROR("Failed to initialize container \"%s\".", name
);
1745 handler
->data
= data
;
1746 handler
->backgrounded
= backgrounded
;
1748 if (!attach_block_device(handler
->conf
)) {
1749 ERROR("Failed to attach block device.");
1750 goto out_fini_nonet
;
1753 if (geteuid() == 0 && !lxc_list_empty(&conf
->id_map
)) {
1754 /* If the backing store is a device, mount it here and now. */
1755 if (rootfs_is_blockdev(conf
)) {
1756 if (unshare(CLONE_NEWNS
) < 0) {
1757 ERROR("Failed to unshare CLONE_NEWNS.");
1758 goto out_fini_nonet
;
1760 INFO("Unshared CLONE_NEWNS.");
1762 remount_all_slave();
1763 if (do_rootfs_setup(conf
, name
, lxcpath
) < 0) {
1764 ERROR("Error setting up rootfs mount as root before spawn.");
1765 goto out_fini_nonet
;
1767 INFO("Set up container rootfs as host root.");
1771 err
= lxc_spawn(handler
);
1773 ERROR("Failed to spawn container \"%s\".", name
);
1774 goto out_detach_blockdev
;
1776 /* close parent side of data socket */
1777 close(handler
->data_sock
[0]);
1778 handler
->data_sock
[0] = -1;
1779 close(handler
->data_sock
[1]);
1780 handler
->data_sock
[1] = -1;
1782 handler
->conf
->reboot
= 0;
1784 err
= lxc_poll(name
, handler
);
1786 ERROR("LXC mainloop exited with error: %d.", err
);
1790 while (waitpid(handler
->pid
, &status
, 0) < 0 && errno
== EINTR
)
1793 /* If the child process exited but was not signaled, it didn't call
1794 * reboot. This should mean it was an lxc-execute which simply exited.
1795 * In any case, treat it as a 'halt'.
1797 if (WIFSIGNALED(status
)) {
1798 switch(WTERMSIG(status
)) {
1799 case SIGINT
: /* halt */
1800 DEBUG("Container \"%s\" is halting.", name
);
1802 case SIGHUP
: /* reboot */
1803 DEBUG("Container \"%s\" is rebooting.", name
);
1804 handler
->conf
->reboot
= 1;
1806 case SIGSYS
: /* seccomp */
1807 DEBUG("Container \"%s\" violated its seccomp policy.", name
);
1810 DEBUG("Unknown exit status for container \"%s\" init %d.", name
, WTERMSIG(status
));
1815 err
= lxc_restore_phys_nics_to_netns(handler
);
1817 ERROR("Failed to move physical network devices back to parent "
1818 "network namespace");
1820 if (handler
->pinfd
>= 0) {
1821 close(handler
->pinfd
);
1822 handler
->pinfd
= -1;
1825 lxc_monitor_send_exit_code(name
, status
, handler
->lxcpath
);
1826 lxc_error_set_and_log(handler
->pid
, status
);
1829 lxc_delete_network(handler
);
1831 out_detach_blockdev
:
1832 detach_block_device(handler
->conf
);
1835 lxc_fini(name
, handler
);
1839 lxc_abort(name
, handler
);
1847 static int start(struct lxc_handler
*handler
, void* data
)
1849 struct start_args
*arg
= data
;
1851 NOTICE("Exec'ing \"%s\".", arg
->argv
[0]);
1853 execvp(arg
->argv
[0], arg
->argv
);
1854 SYSERROR("Failed to exec \"%s\".", arg
->argv
[0]);
1858 static int post_start(struct lxc_handler
*handler
, void* data
)
1860 struct start_args
*arg
= data
;
1862 NOTICE("Started \"%s\" with pid \"%d\".", arg
->argv
[0], handler
->pid
);
1866 static struct lxc_operations start_ops
= {
1868 .post_start
= post_start
1871 int lxc_start(const char *name
, char *const argv
[], struct lxc_handler
*handler
,
1872 const char *lxcpath
, bool backgrounded
)
1874 struct start_args start_arg
= {
1878 return __lxc_start(name
, handler
, &start_ops
, &start_arg
, lxcpath
, backgrounded
);
1881 static void lxc_destroy_container_on_signal(struct lxc_handler
*handler
,
1884 char destroy
[MAXPATHLEN
];
1887 struct lxc_container
*c
;
1888 if (handler
->conf
->rootfs
.path
&& handler
->conf
->rootfs
.mount
) {
1889 bret
= do_destroy_container(handler
);
1891 ERROR("Error destroying rootfs for container \"%s\".", name
);
1895 INFO("Destroyed rootfs for container \"%s\".", name
);
1897 ret
= snprintf(destroy
, MAXPATHLEN
, "%s/%s", handler
->lxcpath
, name
);
1898 if (ret
< 0 || ret
>= MAXPATHLEN
) {
1899 ERROR("Error destroying directory for container \"%s\".", name
);
1903 c
= lxc_container_new(name
, handler
->lxcpath
);
1905 if (container_disk_lock(c
)) {
1906 INFO("Could not update lxc_snapshots file.");
1907 lxc_container_put(c
);
1909 mod_all_rdeps(c
, false);
1910 container_disk_unlock(c
);
1911 lxc_container_put(c
);
1915 if (!handler
->am_root
)
1916 ret
= userns_exec_full(handler
->conf
, lxc_rmdir_onedev_wrapper
,
1917 destroy
, "lxc_rmdir_onedev_wrapper");
1919 ret
= lxc_rmdir_onedev(destroy
, NULL
);
1922 ERROR("Error destroying directory for container \"%s\".", name
);
1925 INFO("Destroyed directory for container \"%s\".", name
);
1928 static int lxc_rmdir_onedev_wrapper(void *data
)
1930 char *arg
= (char *) data
;
1931 return lxc_rmdir_onedev(arg
, NULL
);
1934 static bool do_destroy_container(struct lxc_handler
*handler
) {
1937 if (!handler
->am_root
) {
1938 ret
= userns_exec_full(handler
->conf
, storage_destroy_wrapper
,
1939 handler
->conf
, "storage_destroy_wrapper");
1946 return storage_destroy(handler
->conf
);