]>
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"
86 #include "storage/storage.h"
87 #include "storage/storage_utils.h"
93 #include "include/strlcpy.h"
96 lxc_log_define(lxc_start
, lxc
);
98 extern void mod_all_rdeps(struct lxc_container
*c
, bool inc
);
99 static bool do_destroy_container(struct lxc_handler
*handler
);
100 static int lxc_rmdir_onedev_wrapper(void *data
);
101 static void lxc_destroy_container_on_signal(struct lxc_handler
*handler
,
104 static void print_top_failing_dir(const char *path
)
108 char *copy
, *e
, *p
, saved
;
111 copy
= alloca(len
+ 1);
116 while (p
< e
&& *p
== '/')
119 while (p
< e
&& *p
!= '/')
125 ret
= access(copy
, X_OK
);
127 SYSERROR("Could not access %s. Please grant it x "
128 "access, or add an ACL for the container "
136 static void lxc_put_nsfds(struct lxc_handler
*handler
)
140 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
141 if (handler
->nsfd
[i
] < 0)
144 close(handler
->nsfd
[i
]);
145 handler
->nsfd
[i
] = -EBADF
;
149 static int lxc_try_preserve_ns(const int pid
, const char *ns
)
153 fd
= lxc_preserve_ns(pid
, ns
);
155 if (errno
!= ENOENT
) {
156 SYSERROR("Failed to preserve %s namespace", ns
);
160 WARN("%s - Kernel does not support preserving %s namespaces",
161 strerror(errno
), ns
);
168 /* lxc_try_preserve_namespaces: open /proc/@pid/ns/@ns for each namespace
169 * specified in ns_clone_flags.
170 * Return true on success, false on failure.
172 static bool lxc_try_preserve_namespaces(struct lxc_handler
*handler
,
173 int ns_clone_flags
, pid_t pid
)
177 for (i
= 0; i
< LXC_NS_MAX
; i
++)
178 handler
->nsfd
[i
] = -EBADF
;
180 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
183 if ((ns_clone_flags
& ns_info
[i
].clone_flag
) == 0)
186 fd
= lxc_try_preserve_ns(pid
, ns_info
[i
].proc_name
);
188 handler
->nsfd
[i
] = -EBADF
;
190 /* Do not fail to start container on kernels that do
191 * not support interacting with namespaces through
194 if (fd
== -EOPNOTSUPP
)
197 lxc_put_nsfds(handler
);
201 handler
->nsfd
[i
] = fd
;
202 DEBUG("Preserved %s namespace via fd %d", ns_info
[i
].proc_name
,
209 static int match_fd(int fd
)
211 return (fd
== 0 || fd
== 1 || fd
== 2);
214 int lxc_check_inherited(struct lxc_conf
*conf
, bool closeall
,
215 int *fds_to_ignore
, size_t len_fds
)
220 struct dirent
*direntp
;
222 if (conf
&& conf
->close_all_fds
)
226 dir
= opendir("/proc/self/fd");
228 WARN("%s - Failed to open directory", strerror(errno
));
234 while ((direntp
= readdir(dir
))) {
236 struct lxc_list
*cur
;
237 bool matched
= false;
239 if (strcmp(direntp
->d_name
, ".") == 0)
242 if (strcmp(direntp
->d_name
, "..") == 0)
245 ret
= lxc_safe_int(direntp
->d_name
, &fd
);
247 INFO("Could not parse file descriptor for \"%s\"", direntp
->d_name
);
251 for (i
= 0; i
< len_fds
; i
++)
252 if (fds_to_ignore
[i
] == fd
)
255 if (fd
== fddir
|| fd
== lxc_log_fd
||
256 (i
< len_fds
&& fd
== fds_to_ignore
[i
]))
259 /* Keep state clients that wait on reboots. */
261 lxc_list_for_each(cur
, &conf
->state_clients
) {
262 struct lxc_state_client
*client
= cur
->elem
;
264 if (client
->clientfd
!= fd
)
275 if (current_config
&& fd
== current_config
->logfd
)
284 INFO("Closed inherited fd %d", fd
);
287 WARN("Inherited fd %d", fd
);
290 /* Only enable syslog at this point to avoid the above logging function
291 * to open a new fd and make the check_inherited function enter an
294 lxc_log_enable_syslog();
296 closedir(dir
); /* cannot fail */
300 static int setup_signal_fd(sigset_t
*oldmask
)
304 int signals
[] = {SIGBUS
, SIGILL
, SIGSEGV
, SIGWINCH
};
306 /* Block everything except serious error signals. */
307 ret
= sigfillset(&mask
);
311 for (sig
= 0; sig
< (sizeof(signals
) / sizeof(signals
[0])); sig
++) {
312 ret
= sigdelset(&mask
, signals
[sig
]);
317 ret
= sigprocmask(SIG_BLOCK
, &mask
, oldmask
);
319 SYSERROR("Failed to set signal mask");
323 ret
= signalfd(-1, &mask
, SFD_CLOEXEC
);
325 SYSERROR("Failed to create signal file descriptor");
329 TRACE("Created signal file descriptor %d", ret
);
334 static int signal_handler(int fd
, uint32_t events
, void *data
,
335 struct lxc_epoll_descr
*descr
)
339 struct signalfd_siginfo siginfo
;
340 struct lxc_handler
*hdlr
= data
;
342 ret
= read(fd
, &siginfo
, sizeof(siginfo
));
344 ERROR("Failed to read signal info from signal file descriptor %d", fd
);
348 if (ret
!= sizeof(siginfo
)) {
349 ERROR("Unexpected size for struct signalfd_siginfo");
353 /* Check whether init is running. */
355 ret
= waitid(P_PID
, hdlr
->pid
, &info
, WEXITED
| WNOWAIT
| WNOHANG
);
356 if (ret
== 0 && info
.si_pid
== hdlr
->pid
)
357 hdlr
->init_died
= true;
359 /* Try to figure out a reasonable exit status to report. */
360 if (hdlr
->init_died
) {
361 switch (info
.si_code
) {
363 hdlr
->exit_status
= info
.si_status
<< 8;
368 hdlr
->exit_status
= info
.si_status
<< 8 | 0x7f;
371 /* Huh? The waitid() told us it's dead *and* continued? */
372 WARN("Init %d dead and continued?", hdlr
->pid
);
373 hdlr
->exit_status
= 1;
376 ERROR("Unknown si_code: %d", hdlr
->init_died
);
377 hdlr
->exit_status
= 1;
381 if (siginfo
.ssi_signo
== SIGHUP
) {
382 kill(hdlr
->pid
, SIGTERM
);
383 INFO("Killing %d since terminal hung up", hdlr
->pid
);
384 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
387 if (siginfo
.ssi_signo
!= SIGCHLD
) {
388 kill(hdlr
->pid
, siginfo
.ssi_signo
);
389 INFO("Forwarded signal %d to pid %d", siginfo
.ssi_signo
, hdlr
->pid
);
390 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
393 /* More robustness, protect ourself from a SIGCHLD sent
394 * by a process different from the container init.
396 if (siginfo
.ssi_pid
!= hdlr
->pid
) {
397 NOTICE("Received %d from pid %d instead of container init %d",
398 siginfo
.ssi_signo
, siginfo
.ssi_pid
, hdlr
->pid
);
399 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
402 if (siginfo
.ssi_code
== CLD_STOPPED
) {
403 INFO("Container init process was stopped");
404 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
405 } else if (siginfo
.ssi_code
== CLD_CONTINUED
) {
406 INFO("Container init process was continued");
407 return hdlr
->init_died
? LXC_MAINLOOP_CLOSE
: 0;
410 DEBUG("Container init process %d exited", hdlr
->pid
);
411 return LXC_MAINLOOP_CLOSE
;
414 int lxc_serve_state_clients(const char *name
, struct lxc_handler
*handler
,
419 struct lxc_list
*cur
, *next
;
420 struct lxc_state_client
*client
;
421 struct lxc_msg msg
= {.type
= lxc_msg_state
, .value
= state
};
424 handler
->state
= RUNNING
;
426 handler
->state
= state
;
428 TRACE("Set container state to %s", lxc_state2str(state
));
430 if (lxc_list_empty(&handler
->conf
->state_clients
)) {
431 TRACE("No state clients registered");
435 retlen
= strlcpy(msg
.name
, name
, sizeof(msg
.name
));
436 if (retlen
>= sizeof(msg
.name
))
439 lxc_list_for_each_safe(cur
, &handler
->conf
->state_clients
, next
) {
442 if (client
->states
[state
] == 0) {
443 TRACE("State %s not registered for state client %d",
444 lxc_state2str(state
), client
->clientfd
);
448 TRACE("Sending state %s to state client %d",
449 lxc_state2str(state
), client
->clientfd
);
452 ret
= send(client
->clientfd
, &msg
, sizeof(msg
), 0);
454 if (errno
== EINTR
) {
455 TRACE("Caught EINTR; retrying");
459 ERROR("%s - Failed to send message to client",
463 /* kick client from list */
465 close(client
->clientfd
);
473 static int lxc_serve_state_socket_pair(const char *name
,
474 struct lxc_handler
*handler
,
479 if (!handler
->backgrounded
||
480 handler
->state_socket_pair
[1] < 0 ||
484 /* Close read end of the socket pair. */
485 close(handler
->state_socket_pair
[0]);
486 handler
->state_socket_pair
[0] = -1;
489 ret
= lxc_abstract_unix_send_credential(handler
->state_socket_pair
[1],
490 &(int){state
}, sizeof(int));
491 if (ret
!= sizeof(int)) {
494 SYSERROR("Failed to send state to %d",
495 handler
->state_socket_pair
[1]);
499 TRACE("Sent container state \"%s\" to %d", lxc_state2str(state
),
500 handler
->state_socket_pair
[1]);
502 /* Close write end of the socket pair. */
503 close(handler
->state_socket_pair
[1]);
504 handler
->state_socket_pair
[1] = -1;
509 int lxc_set_state(const char *name
, struct lxc_handler
*handler
,
514 ret
= lxc_serve_state_socket_pair(name
, handler
, state
);
516 ERROR("Failed to synchronize via anonymous pair of unix sockets");
520 ret
= lxc_serve_state_clients(name
, handler
, state
);
524 /* This function will try to connect to the legacy lxc-monitord state
525 * server and only exists for backwards compatibility.
527 lxc_monitor_send_state(name
, state
, handler
->lxcpath
);
532 int lxc_poll(const char *name
, struct lxc_handler
*handler
)
535 bool has_console
= true;
536 struct lxc_epoll_descr descr
, descr_console
;
538 if (handler
->conf
->console
.path
&&
539 strcmp(handler
->conf
->console
.path
, "none") == 0)
542 ret
= lxc_mainloop_open(&descr
);
544 ERROR("Failed to create mainloop");
549 ret
= lxc_mainloop_open(&descr_console
);
551 ERROR("Failed to create console mainloop");
556 ret
= lxc_mainloop_add_handler(&descr
, handler
->sigfd
, signal_handler
, handler
);
558 ERROR("Failed to add signal handler for %d to mainloop", handler
->sigfd
);
559 goto out_mainloop_console
;
563 struct lxc_terminal
*console
= &handler
->conf
->console
;
565 ret
= lxc_terminal_mainloop_add(&descr
, console
);
567 ERROR("Failed to add console handlers to mainloop");
568 goto out_mainloop_console
;
571 ret
= lxc_terminal_mainloop_add(&descr_console
, console
);
573 ERROR("Failed to add console handlers to console mainloop");
574 goto out_mainloop_console
;
577 handler
->conf
->console
.descr
= &descr
;
580 ret
= lxc_cmd_mainloop_add(name
, &descr
, handler
);
582 ERROR("Failed to add command handler to mainloop");
583 goto out_mainloop_console
;
586 TRACE("Mainloop is ready");
588 ret
= lxc_mainloop(&descr
, -1);
591 if (ret
< 0 || !handler
->init_died
)
592 goto out_mainloop_console
;
595 ret
= lxc_mainloop(&descr_console
, 0);
597 out_mainloop_console
:
599 lxc_mainloop_close(&descr_console
);
600 TRACE("Closed console mainloop");
604 lxc_mainloop_close(&descr
);
605 TRACE("Closed mainloop");
608 close(handler
->sigfd
);
609 TRACE("Closed signal file descriptor %d", handler
->sigfd
);
610 handler
->sigfd
= -EBADF
;
615 void lxc_zero_handler(struct lxc_handler
*handler
)
619 memset(handler
, 0, sizeof(struct lxc_handler
));
621 handler
->ns_clone_flags
= -1;
627 for (i
= 0; i
< LXC_NS_MAX
; i
++)
628 handler
->nsfd
[i
] = -1;
630 handler
->data_sock
[0] = -1;
631 handler
->data_sock
[1] = -1;
633 handler
->state_socket_pair
[0] = -1;
634 handler
->state_socket_pair
[1] = -1;
636 handler
->sync_sock
[0] = -1;
637 handler
->sync_sock
[1] = -1;
640 void lxc_free_handler(struct lxc_handler
*handler
)
642 if (handler
->pinfd
>= 0)
643 close(handler
->pinfd
);
645 if (handler
->sigfd
>= 0)
646 close(handler
->sigfd
);
648 lxc_put_nsfds(handler
);
650 if (handler
->conf
&& handler
->conf
->reboot
== 0)
651 if (handler
->conf
->maincmd_fd
>= 0)
652 close(handler
->conf
->maincmd_fd
);
654 if (handler
->state_socket_pair
[0] >= 0)
655 close(handler
->state_socket_pair
[0]);
657 if (handler
->state_socket_pair
[1] >= 0)
658 close(handler
->state_socket_pair
[1]);
660 handler
->conf
= NULL
;
665 struct lxc_handler
*lxc_init_handler(const char *name
, struct lxc_conf
*conf
,
666 const char *lxcpath
, bool daemonize
)
669 struct lxc_handler
*handler
;
671 handler
= malloc(sizeof(*handler
));
674 memset(handler
, 0, sizeof(*handler
));
676 /* Note that am_guest_unpriv() checks the effective uid. We
677 * probably don't care if we are real root only if we are running
678 * as root so this should be fine.
680 handler
->am_root
= !am_guest_unpriv();
681 handler
->data_sock
[0] = handler
->data_sock
[1] = -1;
682 handler
->conf
= conf
;
683 handler
->lxcpath
= lxcpath
;
685 handler
->sigfd
= -EBADF
;
686 handler
->init_died
= false;
687 handler
->state_socket_pair
[0] = handler
->state_socket_pair
[1] = -1;
688 if (handler
->conf
->reboot
== 0)
689 lxc_list_init(&handler
->conf
->state_clients
);
691 for (i
= 0; i
< LXC_NS_MAX
; i
++)
692 handler
->nsfd
[i
] = -1;
694 handler
->name
= name
;
696 if (daemonize
&& !handler
->conf
->reboot
) {
697 /* Create socketpair() to synchronize on daemonized startup.
698 * When the container reboots we don't need to synchronize
699 * again currently so don't open another socketpair().
701 ret
= socketpair(AF_UNIX
, SOCK_STREAM
| SOCK_CLOEXEC
, 0,
702 handler
->state_socket_pair
);
704 ERROR("Failed to create anonymous pair of unix sockets");
707 TRACE("Created anonymous pair {%d,%d} of unix sockets",
708 handler
->state_socket_pair
[0],
709 handler
->state_socket_pair
[1]);
712 if (handler
->conf
->reboot
== 0) {
713 handler
->conf
->maincmd_fd
= lxc_cmd_init(name
, lxcpath
, "command");
714 if (handler
->conf
->maincmd_fd
< 0) {
715 ERROR("Failed to set up command socket");
719 TRACE("Unix domain socket %d for command server is ready",
720 handler
->conf
->maincmd_fd
);
725 lxc_free_handler(handler
);
730 int lxc_init(const char *name
, struct lxc_handler
*handler
)
733 const char *loglevel
;
734 struct lxc_conf
*conf
= handler
->conf
;
737 TRACE("Initialized LSM");
739 ret
= lxc_read_seccomp_config(conf
);
741 ERROR("Failed loading seccomp policy");
742 goto out_close_maincmd_fd
;
744 TRACE("Read seccomp policy");
746 /* Begin by setting the state to STARTING. */
747 ret
= lxc_set_state(name
, handler
, STARTING
);
749 ERROR("Failed to set state to \"%s\"", lxc_state2str(STARTING
));
750 goto out_close_maincmd_fd
;
752 TRACE("Set container state to \"STARTING\"");
754 /* Start of environment variable setup for hooks. */
756 ret
= setenv("LXC_NAME", name
, 1);
758 SYSERROR("Failed to set environment variable: LXC_NAME=%s", name
);
762 ret
= setenv("LXC_CONFIG_FILE", conf
->rcfile
, 1);
764 SYSERROR("Failed to set environment variable: "
765 "LXC_CONFIG_FILE=%s", conf
->rcfile
);
768 if (conf
->rootfs
.mount
) {
769 ret
= setenv("LXC_ROOTFS_MOUNT", conf
->rootfs
.mount
, 1);
771 SYSERROR("Failed to set environment variable: "
772 "LXC_ROOTFS_MOUNT=%s", conf
->rootfs
.mount
);
775 if (conf
->rootfs
.path
) {
776 ret
= setenv("LXC_ROOTFS_PATH", conf
->rootfs
.path
, 1);
778 SYSERROR("Failed to set environment variable: "
779 "LXC_ROOTFS_PATH=%s", conf
->rootfs
.path
);
782 if (conf
->console
.path
) {
783 ret
= setenv("LXC_CONSOLE", conf
->console
.path
, 1);
785 SYSERROR("Failed to set environment variable: "
786 "LXC_CONSOLE=%s", conf
->console
.path
);
789 if (conf
->console
.log_path
) {
790 ret
= setenv("LXC_CONSOLE_LOGPATH", conf
->console
.log_path
, 1);
792 SYSERROR("Failed to set environment variable: "
793 "LXC_CONSOLE_LOGPATH=%s", conf
->console
.log_path
);
796 if (cgns_supported()) {
797 ret
= setenv("LXC_CGNS_AWARE", "1", 1);
799 SYSERROR("Failed to set environment variable "
803 loglevel
= lxc_log_priority_to_string(lxc_log_get_level());
804 ret
= setenv("LXC_LOG_LEVEL", loglevel
, 1);
806 SYSERROR("Set environment variable LXC_LOG_LEVEL=%s",
809 if (conf
->hooks_version
== 0)
810 ret
= setenv("LXC_HOOK_VERSION", "0", 1);
812 ret
= setenv("LXC_HOOK_VERSION", "1", 1);
814 SYSERROR("Failed to set environment variable LXC_HOOK_VERSION=%u", conf
->hooks_version
);
815 /* End of environment variable setup for hooks. */
817 TRACE("Set environment variables");
819 ret
= run_lxc_hooks(name
, "pre-start", conf
, NULL
);
821 ERROR("Failed to run lxc.hook.pre-start for container \"%s\"", name
);
824 TRACE("Ran pre-start hooks");
826 /* The signal fd has to be created before forking otherwise if the child
827 * process exits before we setup the signal fd, the event will be lost
828 * and the command will be stuck.
830 handler
->sigfd
= setup_signal_fd(&handler
->oldmask
);
831 if (handler
->sigfd
< 0) {
832 ERROR("Failed to setup SIGCHLD fd handler.");
835 TRACE("Set up signal fd");
837 /* Do this after setting up signals since it might unblock SIGWINCH. */
838 ret
= lxc_terminal_setup(conf
);
840 ERROR("Failed to create console");
841 goto out_restore_sigmask
;
843 TRACE("Created console");
845 ret
= lxc_terminal_map_ids(conf
, &conf
->console
);
847 ERROR("Failed to chown console");
848 goto out_restore_sigmask
;
850 TRACE("Chowned console");
852 INFO("Container \"%s\" is initialized", name
);
856 sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
);
858 lxc_delete_tty(&conf
->ttys
);
860 lxc_set_state(name
, handler
, ABORTING
);
861 out_close_maincmd_fd
:
862 close(conf
->maincmd_fd
);
863 conf
->maincmd_fd
= -1;
867 void lxc_fini(const char *name
, struct lxc_handler
*handler
)
871 struct lxc_list
*cur
, *next
;
872 char *namespaces
[LXC_NS_MAX
+ 1];
873 size_t namespace_count
= 0;
875 /* The STOPPING state is there for future cleanup code which can take
878 lxc_set_state(name
, handler
, STOPPING
);
880 self
= lxc_raw_getpid();
881 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
882 if (handler
->nsfd
[i
] < 0)
885 if (handler
->conf
->hooks_version
== 0)
886 ret
= asprintf(&namespaces
[namespace_count
],
887 "%s:/proc/%d/fd/%d", ns_info
[i
].proc_name
,
888 self
, handler
->nsfd
[i
]);
890 ret
= asprintf(&namespaces
[namespace_count
],
891 "/proc/%d/fd/%d", self
, handler
->nsfd
[i
]);
893 SYSERROR("Failed to allocate memory");
897 if (handler
->conf
->hooks_version
== 0) {
902 ret
= setenv(ns_info
[i
].env_name
, namespaces
[namespace_count
], 1);
904 SYSERROR("Failed to set environment variable %s=%s",
905 ns_info
[i
].env_name
, namespaces
[namespace_count
]);
907 TRACE("Set environment variable %s=%s",
908 ns_info
[i
].env_name
, namespaces
[namespace_count
]);
912 namespaces
[namespace_count
] = NULL
;
914 if (handler
->conf
->reboot
) {
915 ret
= setenv("LXC_TARGET", "reboot", 1);
917 SYSERROR("Failed to set environment variable: "
918 "LXC_TARGET=reboot");
921 if (!handler
->conf
->reboot
) {
922 ret
= setenv("LXC_TARGET", "stop", 1);
924 SYSERROR("Failed to set environment variable: "
928 if (handler
->conf
->hooks_version
== 0)
929 ret
= run_lxc_hooks(name
, "stop", handler
->conf
, namespaces
);
931 ret
= run_lxc_hooks(name
, "stop", handler
->conf
, NULL
);
933 ERROR("Failed to run \"lxc.hook.stop\" hook");
935 while (namespace_count
--)
936 free(namespaces
[namespace_count
]);
938 cgroup_destroy(handler
);
940 if (handler
->conf
->reboot
== 0) {
941 /* For all new state clients simply close the command socket.
942 * This will inform all state clients that the container is
943 * STOPPED and also prevents a race between a open()/close() on
944 * the command socket causing a new process to get ECONNREFUSED
945 * because we haven't yet closed the command socket.
947 close(handler
->conf
->maincmd_fd
);
948 handler
->conf
->maincmd_fd
= -1;
949 TRACE("Closed command socket");
951 /* This function will try to connect to the legacy lxc-monitord
952 * state server and only exists for backwards compatibility.
954 lxc_monitor_send_state(name
, STOPPED
, handler
->lxcpath
);
956 /* The command socket is closed so no one can acces the command
957 * socket anymore so there's no need to lock it.
959 handler
->state
= STOPPED
;
960 TRACE("Set container state to \"STOPPED\"");
962 lxc_set_state(name
, handler
, STOPPED
);
965 ret
= run_lxc_hooks(name
, "post-stop", handler
->conf
, NULL
);
967 ERROR("Failed to run lxc.hook.post-stop for container \"%s\"", name
);
968 if (handler
->conf
->reboot
) {
969 WARN("Container will be stopped instead of rebooted");
970 handler
->conf
->reboot
= 0;
972 ret
= setenv("LXC_TARGET", "stop", 1);
974 WARN("Failed to set environment variable: "
979 /* Reset mask set by setup_signal_fd. */
980 ret
= sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
);
982 WARN("%s - Failed to restore signal mask", strerror(errno
));
984 lxc_terminal_delete(&handler
->conf
->console
);
985 lxc_delete_tty(&handler
->conf
->ttys
);
987 /* The command socket is now closed, no more state clients can register
988 * themselves from now on. So free the list of state clients.
990 lxc_list_for_each_safe(cur
, &handler
->conf
->state_clients
, next
) {
991 struct lxc_state_client
*client
= cur
->elem
;
993 /* Keep state clients that want to be notified about reboots. */
994 if ((handler
->conf
->reboot
> 0) && (client
->states
[RUNNING
] == 2))
997 /* close state client socket */
999 close(client
->clientfd
);
1004 if (handler
->conf
->ephemeral
== 1 && handler
->conf
->reboot
!= 1)
1005 lxc_destroy_container_on_signal(handler
, name
);
1007 lxc_free_handler(handler
);
1010 void lxc_abort(const char *name
, struct lxc_handler
*handler
)
1014 lxc_set_state(name
, handler
, ABORTING
);
1016 if (handler
->pid
> 0) {
1017 ret
= kill(handler
->pid
, SIGKILL
);
1019 SYSERROR("Failed to send SIGKILL to %d", handler
->pid
);
1022 while ((ret
= waitpid(-1, &status
, 0)) > 0) {
1027 static int do_start(void *data
)
1030 char path
[PATH_MAX
];
1031 bool have_cap_setgid
;
1034 struct lxc_list
*iterator
;
1035 int devnull_fd
= -1;
1036 struct lxc_handler
*handler
= data
;
1038 lxc_sync_fini_parent(handler
);
1040 /* This prctl must be before the synchro, so if the parent dies before
1041 * we set the parent death signal, we will detect its death with the
1042 * synchro right after, otherwise we have a window where the parent can
1043 * exit before we set the pdeath signal leading to a unsupervized
1046 ret
= lxc_set_death_signal(SIGKILL
);
1048 SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL");
1049 goto out_warn_father
;
1052 ret
= sigprocmask(SIG_SETMASK
, &handler
->oldmask
, NULL
);
1054 SYSERROR("Failed to set signal mask");
1055 goto out_warn_father
;
1058 /* Don't leak the pinfd to the container. */
1059 if (handler
->pinfd
>= 0)
1060 close(handler
->pinfd
);
1062 ret
= lxc_sync_wait_parent(handler
, LXC_SYNC_STARTUP
);
1064 goto out_warn_father
;
1066 /* Unshare CLONE_NEWNET after CLONE_NEWUSER. See
1067 * https://github.com/lxc/lxd/issues/1978.
1069 if ((handler
->ns_clone_flags
& (CLONE_NEWNET
| CLONE_NEWUSER
)) ==
1070 (CLONE_NEWNET
| CLONE_NEWUSER
)) {
1071 ret
= unshare(CLONE_NEWNET
);
1073 SYSERROR("Failed to unshare CLONE_NEWNET");
1074 goto out_warn_father
;
1076 INFO("Unshared CLONE_NEWNET");
1079 /* Tell the parent task it can begin to configure the container and wait
1082 ret
= lxc_sync_barrier_parent(handler
, LXC_SYNC_CONFIGURE
);
1086 ret
= lxc_network_recv_veth_names_from_parent(handler
);
1088 ERROR("Failed to receive veth names from parent");
1089 goto out_warn_father
;
1092 /* If we are in a new user namespace, become root there to have
1093 * privilege over our namespace.
1095 if (!lxc_list_empty(&handler
->conf
->id_map
)) {
1096 uid_t nsuid
= (handler
->conf
->root_nsuid_map
!= NULL
)
1098 : handler
->conf
->init_uid
;
1099 gid_t nsgid
= (handler
->conf
->root_nsgid_map
!= NULL
)
1101 : handler
->conf
->init_gid
;
1103 ret
= lxc_switch_uid_gid(nsuid
, nsgid
);
1105 goto out_warn_father
;
1107 /* Drop groups only after we switched to a valid gid in the new
1110 ret
= lxc_setgroups(0, NULL
);
1111 if (ret
< 0 && (handler
->am_root
|| errno
!= EPERM
))
1112 goto out_warn_father
;
1114 ret
= prctl(PR_SET_DUMPABLE
, 1, 0, 0, 0);
1116 goto out_warn_father
;
1118 /* set{g,u}id() clears deathsignal */
1119 ret
= lxc_set_death_signal(SIGKILL
);
1121 SYSERROR("Failed to set PR_SET_PDEATHSIG to SIGKILL");
1122 goto out_warn_father
;
1126 ret
= access(handler
->lxcpath
, X_OK
);
1128 print_top_failing_dir(handler
->lxcpath
);
1129 goto out_warn_father
;
1132 ret
= snprintf(path
, sizeof(path
), "%s/dev/null",
1133 handler
->conf
->rootfs
.mount
);
1134 if (ret
< 0 || ret
>= sizeof(path
))
1135 goto out_warn_father
;
1137 /* In order to checkpoint restore, we need to have everything in the
1138 * same mount namespace. However, some containers may not have a
1139 * reasonable /dev (in particular, they may not have /dev/null), so we
1140 * can't set init's std fds to /dev/null by opening it from inside the
1143 * If that's the case, fall back to using the host's /dev/null. This
1144 * means that migration won't work, but at least we won't spew output
1145 * where it isn't wanted.
1147 if (handler
->backgrounded
&& !handler
->conf
->autodev
) {
1148 ret
= access(path
, F_OK
);
1150 devnull_fd
= open_devnull();
1153 goto out_warn_father
;
1154 WARN("Using /dev/null from the host for container "
1155 "init's standard file descriptors. Migration will "
1160 /* Ask father to setup cgroups and wait for him to finish. */
1161 ret
= lxc_sync_barrier_parent(handler
, LXC_SYNC_CGROUP
);
1165 /* Unshare cgroup namespace after we have setup our cgroups. If we do it
1166 * earlier we end up with a wrong view of /proc/self/cgroup. For
1167 * example, assume we unshare(CLONE_NEWCGROUP) first, and then create
1168 * the cgroup for the container, say /sys/fs/cgroup/cpuset/lxc/c, then
1169 * /proc/self/cgroup would show us:
1173 * whereas it should actually show
1177 if (handler
->ns_clone_flags
& CLONE_NEWCGROUP
) {
1178 ret
= unshare(CLONE_NEWCGROUP
);
1180 INFO("Failed to unshare CLONE_NEWCGROUP");
1181 goto out_warn_father
;
1183 INFO("Unshared CLONE_NEWCGROUP");
1186 /* Add the requested environment variables to the current environment to
1187 * allow them to be used by the various hooks, such as the start hook
1190 lxc_list_for_each(iterator
, &handler
->conf
->environment
) {
1191 ret
= putenv((char *)iterator
->elem
);
1193 SYSERROR("Failed to set environment variable: %s",
1194 (char *)iterator
->elem
);
1195 goto out_warn_father
;
1199 /* Setup the container, ip, names, utsname, ... */
1200 ret
= lxc_setup(handler
);
1201 close(handler
->data_sock
[1]);
1202 close(handler
->data_sock
[0]);
1204 ERROR("Failed to setup container \"%s\"", handler
->name
);
1205 goto out_warn_father
;
1208 /* Set the label to change to when we exec(2) the container's init. */
1209 ret
= lsm_process_label_set(NULL
, handler
->conf
, 1, 1);
1211 goto out_warn_father
;
1213 /* Set PR_SET_NO_NEW_PRIVS after we changed the lsm label. If we do it
1214 * before we aren't allowed anymore.
1216 if (handler
->conf
->no_new_privs
) {
1217 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1219 SYSERROR("Could not set PR_SET_NO_NEW_PRIVS to block "
1220 "execve() gainable privileges");
1221 goto out_warn_father
;
1223 DEBUG("Set PR_SET_NO_NEW_PRIVS to block execve() gainable "
1227 /* Some init's such as busybox will set sane tty settings on stdin,
1228 * stdout, stderr which it thinks is the console. We already set them
1229 * the way we wanted on the real terminal, and we want init to do its
1230 * setup on its console ie. the pty allocated in lxc_terminal_setup() so
1231 * make sure that that pty is stdin,stdout,stderr.
1233 if (handler
->conf
->console
.slave
>= 0) {
1234 if (handler
->backgrounded
|| handler
->conf
->is_execute
== 0)
1235 ret
= set_stdfds(handler
->conf
->console
.slave
);
1237 ret
= lxc_terminal_set_stdfds(handler
->conf
->console
.slave
);
1239 ERROR("Failed to redirect std{in,out,err} to pty file "
1240 "descriptor %d", handler
->conf
->console
.slave
);
1241 goto out_warn_father
;
1245 /* If we mounted a temporary proc, then unmount it now. */
1246 tmp_proc_unmount(handler
->conf
);
1248 ret
= lxc_seccomp_load(handler
->conf
);
1250 goto out_warn_father
;
1252 ret
= run_lxc_hooks(handler
->name
, "start", handler
->conf
, NULL
);
1254 ERROR("Failed to run lxc.hook.start for container \"%s\"",
1256 goto out_warn_father
;
1259 close(handler
->sigfd
);
1261 if (devnull_fd
< 0) {
1262 devnull_fd
= open_devnull();
1264 goto out_warn_father
;
1267 if (handler
->conf
->console
.slave
< 0 && handler
->backgrounded
) {
1268 ret
= set_stdfds(devnull_fd
);
1270 ERROR("Failed to redirect std{in,out,err} to \"/dev/null\"");
1271 goto out_warn_father
;
1275 if (devnull_fd
>= 0) {
1282 if (handler
->conf
->init_cwd
) {
1283 ret
= chdir(handler
->conf
->init_cwd
);
1285 SYSERROR("Could not change directory to \"%s\"",
1286 handler
->conf
->init_cwd
);
1287 goto out_warn_father
;
1291 ret
= lxc_sync_barrier_parent(handler
, LXC_SYNC_CGROUP_LIMITS
);
1293 goto out_warn_father
;
1295 /* Reset the environment variables the user requested in a clear
1299 /* Don't error out though. */
1301 SYSERROR("Failed to clear environment.");
1303 lxc_list_for_each(iterator
, &handler
->conf
->environment
) {
1304 ret
= putenv((char *)iterator
->elem
);
1306 SYSERROR("Failed to set environment variable: %s",
1307 (char *)iterator
->elem
);
1308 goto out_warn_father
;
1312 ret
= putenv("container=lxc");
1314 SYSERROR("Failed to set environment variable: container=lxc");
1315 goto out_warn_father
;
1318 if (handler
->conf
->pty_names
) {
1319 ret
= putenv(handler
->conf
->pty_names
);
1321 SYSERROR("Failed to set environment variable for container ptys");
1322 goto out_warn_father
;
1326 /* The container has been setup. We can now switch to an unprivileged
1329 new_uid
= handler
->conf
->init_uid
;
1330 new_gid
= handler
->conf
->init_gid
;
1332 /* If we are in a new user namespace we already dropped all groups when
1333 * we switched to root in the new user namespace further above. Only
1334 * drop groups if we can, so ensure that we have necessary privilege.
1337 have_cap_setgid
= lxc_proc_cap_is_set(CAP_SETGID
, CAP_EFFECTIVE
);
1339 have_cap_setgid
= false;
1341 if (lxc_list_empty(&handler
->conf
->id_map
) && have_cap_setgid
) {
1342 ret
= lxc_setgroups(0, NULL
);
1344 goto out_warn_father
;
1347 ret
= lxc_switch_uid_gid(new_uid
, new_gid
);
1349 goto out_warn_father
;
1351 /* After this call, we are in error because this ops should not return
1354 handler
->ops
->start(handler
, handler
->data
);
1357 /* We want the parent to know something went wrong, so we return a
1358 * special error code.
1360 lxc_sync_wake_parent(handler
, LXC_SYNC_ERROR
);
1363 if (devnull_fd
>= 0)
1369 static int lxc_recv_ttys_from_child(struct lxc_handler
*handler
)
1372 struct lxc_terminal_info
*tty
;
1374 int sock
= handler
->data_sock
[1];
1375 struct lxc_conf
*conf
= handler
->conf
;
1376 struct lxc_tty_info
*ttys
= &conf
->ttys
;
1381 ttys
->tty
= malloc(sizeof(*ttys
->tty
) * conf
->tty
);
1385 for (i
= 0; i
< conf
->tty
; i
++) {
1388 ret
= lxc_abstract_unix_recv_fds(sock
, ttyfds
, 2, NULL
, 0);
1392 tty
= &ttys
->tty
[i
];
1394 tty
->master
= ttyfds
[0];
1395 tty
->slave
= ttyfds
[1];
1396 TRACE("Received pty with master fd %d and slave fd %d from "
1397 "parent", tty
->master
, tty
->slave
);
1400 ERROR("Failed to receive %d ttys from child: %s", conf
->tty
,
1403 TRACE("Received %d ttys from child", conf
->tty
);
1405 ttys
->nbtty
= conf
->tty
;
1410 int resolve_clone_flags(struct lxc_handler
*handler
)
1413 struct lxc_conf
*conf
= handler
->conf
;
1415 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1416 if (conf
->ns_keep
!= 0) {
1417 if ((conf
->ns_keep
& ns_info
[i
].clone_flag
) == 0)
1418 handler
->ns_clone_flags
|= ns_info
[i
].clone_flag
;
1419 } else if (conf
->ns_clone
!= 0) {
1420 if ((conf
->ns_clone
& ns_info
[i
].clone_flag
) > 0)
1421 handler
->ns_clone_flags
|= ns_info
[i
].clone_flag
;
1423 if (i
== LXC_NS_USER
&& lxc_list_empty(&handler
->conf
->id_map
))
1426 if (i
== LXC_NS_NET
&& lxc_requests_empty_network(handler
))
1429 if (i
== LXC_NS_CGROUP
&& !cgns_supported())
1432 handler
->ns_clone_flags
|= ns_info
[i
].clone_flag
;
1435 if (!conf
->ns_share
[i
])
1438 handler
->ns_clone_flags
&= ~ns_info
[i
].clone_flag
;
1439 TRACE("Sharing %s namespace", ns_info
[i
].proc_name
);
1445 /* Note that this function is used with clone(CLONE_VM). Some glibc versions
1446 * used to reset the pid/tid to -1 when CLONE_VM was used without CLONE_THREAD.
1447 * But since the memory between parent and child is shared on CLONE_VM this
1448 * would invalidate the getpid() cache that glibc used to maintain and so
1449 * getpid() in the child would return the parent's pid. This is all fixed in
1450 * newer glibc versions where the getpid() cache is removed and the pid/tid is
1451 * not reset anymore.
1452 * However, if for whatever reason you - dear commiter - somehow need to get the
1453 * pid of the dummy intermediate process for do_share_ns() you need to call
1454 * lxc_raw_getpid(). The next lxc_raw_clone() call does not employ CLONE_VM and
1457 static inline int do_share_ns(void *arg
)
1460 struct lxc_handler
*handler
= arg
;
1462 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1463 if (handler
->nsfd
[i
] < 0)
1466 ret
= setns(handler
->nsfd
[i
], 0);
1470 DEBUG("Inherited %s namespace", ns_info
[i
].proc_name
);
1473 flags
= handler
->ns_on_clone_flags
;
1474 flags
|= CLONE_PARENT
;
1475 handler
->pid
= lxc_raw_clone_cb(do_start
, handler
, flags
);
1476 if (handler
->pid
< 0)
1482 /* lxc_spawn() performs crucial setup tasks and clone()s the new process which
1483 * exec()s the requested container binary.
1484 * Note that lxc_spawn() runs in the parent namespaces. Any operations performed
1485 * right here should be double checked if they'd pose a security risk. (For
1486 * example, any {u}mount() operations performed here will be reflected on the
1489 static int lxc_spawn(struct lxc_handler
*handler
)
1493 bool wants_to_map_ids
;
1494 struct lxc_list
*id_map
;
1495 const char *name
= handler
->name
;
1496 const char *lxcpath
= handler
->lxcpath
;
1497 bool cgroups_connected
= false, share_ns
= false;
1498 struct lxc_conf
*conf
= handler
->conf
;
1500 id_map
= &conf
->id_map
;
1501 wants_to_map_ids
= !lxc_list_empty(id_map
);
1503 for (i
= 0; i
< LXC_NS_MAX
; i
++) {
1504 if (!conf
->ns_share
[i
])
1507 handler
->nsfd
[i
] = lxc_inherit_namespace(conf
->ns_share
[i
], lxcpath
, ns_info
[i
].proc_name
);
1508 if (handler
->nsfd
[i
] < 0)
1514 ret
= lxc_sync_init(handler
);
1518 ret
= socketpair(AF_UNIX
, SOCK_STREAM
| SOCK_CLOEXEC
, 0,
1519 handler
->data_sock
);
1521 lxc_sync_fini(handler
);
1525 ret
= resolve_clone_flags(handler
);
1527 lxc_sync_fini(handler
);
1531 if (handler
->ns_clone_flags
& CLONE_NEWNET
) {
1532 if (!lxc_list_empty(&conf
->network
)) {
1534 /* Find gateway addresses from the link device, which is
1535 * no longer accessible inside the container. Do this
1536 * before creating network interfaces, since goto
1537 * out_delete_net does not work before lxc_clone.
1539 ret
= lxc_find_gateway_addresses(handler
);
1541 ERROR("Failed to find gateway addresses");
1542 lxc_sync_fini(handler
);
1546 /* That should be done before the clone because we will
1547 * fill the netdev index and use them in the child.
1549 ret
= lxc_create_network_priv(handler
);
1551 ERROR("Failed to create the network");
1552 lxc_sync_fini(handler
);
1558 if (!cgroup_init(handler
)) {
1559 ERROR("Failed initializing cgroup support");
1560 goto out_delete_net
;
1563 cgroups_connected
= true;
1565 if (!cgroup_create(handler
)) {
1566 ERROR("Failed creating cgroups");
1567 goto out_delete_net
;
1570 /* If the rootfs is not a blockdev, prevent the container from marking
1572 * If the container is unprivileged then skip rootfs pinning.
1574 if (!wants_to_map_ids
) {
1575 handler
->pinfd
= pin_rootfs(conf
->rootfs
.path
);
1576 if (handler
->pinfd
== -1)
1577 INFO("Failed to pin the rootfs for container \"%s\"", handler
->name
);
1580 /* Create a process in a new set of namespaces. */
1581 handler
->ns_on_clone_flags
= handler
->ns_clone_flags
;
1582 if (handler
->ns_clone_flags
& CLONE_NEWUSER
) {
1583 /* If CLONE_NEWUSER and CLONE_NEWNET was requested, we need to
1584 * clone a new user namespace first and only later unshare our
1585 * network namespace to ensure that network devices ownership is
1588 handler
->ns_on_clone_flags
&= ~CLONE_NEWNET
;
1590 /* The cgroup namespace gets unshare()ed not clone()ed. */
1591 handler
->ns_on_clone_flags
&= ~CLONE_NEWCGROUP
;
1596 attacher_pid
= lxc_clone(do_share_ns
, handler
,
1597 CLONE_VFORK
| CLONE_VM
| CLONE_FILES
);
1598 if (attacher_pid
< 0) {
1599 SYSERROR(LXC_CLONE_ERROR
);
1600 goto out_delete_net
;
1603 ret
= wait_for_pid(attacher_pid
);
1605 SYSERROR("Intermediate process failed");
1606 goto out_delete_net
;
1609 handler
->pid
= lxc_raw_clone_cb(do_start
, handler
,
1610 handler
->ns_on_clone_flags
);
1612 if (handler
->pid
< 0) {
1613 SYSERROR(LXC_CLONE_ERROR
);
1614 goto out_delete_net
;
1616 TRACE("Cloned child process %d", handler
->pid
);
1618 for (i
= 0; i
< LXC_NS_MAX
; i
++)
1619 if (handler
->ns_on_clone_flags
& ns_info
[i
].clone_flag
)
1620 INFO("Cloned %s", ns_info
[i
].flag_name
);
1622 if (!lxc_try_preserve_namespaces(handler
, handler
->ns_on_clone_flags
, handler
->pid
)) {
1623 ERROR("Failed to preserve cloned namespaces for lxc.hook.stop");
1624 goto out_delete_net
;
1627 lxc_sync_fini_child(handler
);
1629 /* Map the container uids. The container became an invalid userid the
1630 * moment it was cloned with CLONE_NEWUSER. This call doesn't change
1631 * anything immediately, but allows the container to setuid(0) (0 being
1632 * mapped to something else on the host.) later to become a valid uid
1635 if (wants_to_map_ids
) {
1636 if (!handler
->conf
->ns_share
[LXC_NS_USER
] &&
1637 (handler
->conf
->ns_keep
& CLONE_NEWUSER
) == 0) {
1638 ret
= lxc_map_ids(id_map
, handler
->pid
);
1640 ERROR("Failed to set up id mapping.");
1641 goto out_delete_net
;
1646 ret
= lxc_sync_wake_child(handler
, LXC_SYNC_STARTUP
);
1648 goto out_delete_net
;
1650 ret
= lxc_sync_wait_child(handler
, LXC_SYNC_CONFIGURE
);
1652 goto out_delete_net
;
1654 if (!cgroup_setup_limits(handler
, false)) {
1655 ERROR("Failed to setup cgroup limits for container \"%s\"", name
);
1656 goto out_delete_net
;
1659 if (!cgroup_enter(handler
))
1660 goto out_delete_net
;
1662 if (!cgroup_chown(handler
))
1663 goto out_delete_net
;
1665 /* Now we're ready to preserve the network namespace */
1666 ret
= lxc_try_preserve_ns(handler
->pid
, "net");
1668 if (ret
!= -EOPNOTSUPP
) {
1669 ERROR("%s - Failed to preserve net namespace", strerror(errno
));
1670 goto out_delete_net
;
1673 handler
->nsfd
[LXC_NS_NET
] = ret
;
1674 DEBUG("Preserved net namespace via fd %d", ret
);
1677 /* Create the network configuration. */
1678 if (handler
->ns_clone_flags
& CLONE_NEWNET
) {
1679 ret
= lxc_network_move_created_netdev_priv(handler
->lxcpath
,
1684 ERROR("Failed to create the configured network");
1685 goto out_delete_net
;
1688 ret
= lxc_create_network_unpriv(handler
->lxcpath
, handler
->name
,
1689 &conf
->network
, handler
->pid
);
1691 ERROR("Failed to create the configured network");
1692 goto out_delete_net
;
1696 ret
= lxc_network_send_veth_names_to_child(handler
);
1698 ERROR("Failed to send veth names to child");
1699 goto out_delete_net
;
1702 if (!lxc_list_empty(&conf
->procs
)) {
1703 ret
= setup_proc_filesystem(&conf
->procs
, handler
->pid
);
1705 goto out_delete_net
;
1708 /* Tell the child to continue its initialization. We'll get
1709 * LXC_SYNC_CGROUP when it is ready for us to setup cgroups.
1711 ret
= lxc_sync_barrier_child(handler
, LXC_SYNC_POST_CONFIGURE
);
1713 goto out_delete_net
;
1715 if (!lxc_list_empty(&conf
->limits
)) {
1716 ret
= setup_resource_limits(&conf
->limits
, handler
->pid
);
1718 ERROR("Failed to setup resource limits");
1719 goto out_delete_net
;
1723 ret
= lxc_sync_barrier_child(handler
, LXC_SYNC_CGROUP_UNSHARE
);
1725 goto out_delete_net
;
1727 if (!cgroup_setup_limits(handler
, true)) {
1728 ERROR("Failed to setup legacy device cgroup controller limits");
1729 goto out_delete_net
;
1731 TRACE("Set up legacy device cgroup controller limits");
1733 cgroup_disconnect();
1734 cgroups_connected
= false;
1736 if (handler
->ns_clone_flags
& CLONE_NEWCGROUP
) {
1737 /* Now we're ready to preserve the cgroup namespace */
1738 ret
= lxc_try_preserve_ns(handler
->pid
, "cgroup");
1740 if (ret
!= -EOPNOTSUPP
) {
1741 ERROR("%s - Failed to preserve cgroup namespace",
1743 goto out_delete_net
;
1746 handler
->nsfd
[LXC_NS_CGROUP
] = ret
;
1747 DEBUG("Preserved cgroup namespace via fd %d", ret
);
1751 ret
= snprintf(pidstr
, 20, "%d", handler
->pid
);
1752 if (ret
< 0 || ret
>= 20)
1753 goto out_delete_net
;
1755 ret
= setenv("LXC_PID", pidstr
, 1);
1757 SYSERROR("Failed to set environment variable: LXC_PID=%s", pidstr
);
1759 /* Run any host-side start hooks */
1760 ret
= run_lxc_hooks(name
, "start-host", conf
, NULL
);
1762 ERROR("Failed to run lxc.hook.start-host");
1763 goto out_delete_net
;
1766 /* Tell the child to complete its initialization and wait for it to exec
1767 * or return an error. (The child will never return
1768 * LXC_SYNC_READY_START+1. It will either close the sync pipe, causing
1769 * lxc_sync_barrier_child to return success, or return a different
1770 * value, causing us to error out).
1772 ret
= lxc_sync_barrier_child(handler
, LXC_SYNC_READY_START
);
1774 goto out_delete_net
;
1776 ret
= lxc_network_recv_name_and_ifindex_from_child(handler
);
1778 ERROR("Failed to receive names and ifindices for network "
1779 "devices from child");
1780 goto out_delete_net
;
1783 /* Now all networks are created, network devices are moved into place,
1784 * and the correct names and ifindeces in the respective namespaces have
1785 * been recorded. The corresponding structs have now all been filled. So
1786 * log them for debugging purposes.
1788 lxc_log_configured_netdevs(conf
);
1790 /* Read tty fds allocated by child. */
1791 ret
= lxc_recv_ttys_from_child(handler
);
1793 ERROR("Failed to receive tty info from child process");
1794 goto out_delete_net
;
1797 ret
= handler
->ops
->post_start(handler
, handler
->data
);
1801 ret
= lxc_set_state(name
, handler
, RUNNING
);
1803 ERROR("Failed to set state to \"%s\"", lxc_state2str(RUNNING
));
1807 lxc_sync_fini(handler
);
1812 if (cgroups_connected
)
1813 cgroup_disconnect();
1815 if (handler
->ns_clone_flags
& CLONE_NEWNET
)
1816 lxc_delete_network(handler
);
1819 lxc_abort(name
, handler
);
1820 lxc_sync_fini(handler
);
1821 if (handler
->pinfd
>= 0) {
1822 close(handler
->pinfd
);
1823 handler
->pinfd
= -1;
1829 int __lxc_start(const char *name
, struct lxc_handler
*handler
,
1830 struct lxc_operations
* ops
, void *data
, const char *lxcpath
,
1831 bool backgrounded
, int *error_num
)
1834 struct lxc_conf
*conf
= handler
->conf
;
1836 ret
= lxc_init(name
, handler
);
1838 ERROR("Failed to initialize container \"%s\"", name
);
1842 handler
->data
= data
;
1843 handler
->backgrounded
= backgrounded
;
1845 if (!attach_block_device(handler
->conf
)) {
1846 ERROR("Failed to attach block device");
1847 goto out_fini_nonet
;
1850 if (geteuid() == 0 && !lxc_list_empty(&conf
->id_map
)) {
1851 /* If the backing store is a device, mount it here and now. */
1852 if (rootfs_is_blockdev(conf
)) {
1853 ret
= unshare(CLONE_NEWNS
);
1855 ERROR("Failed to unshare CLONE_NEWNS");
1856 goto out_fini_nonet
;
1858 INFO("Unshared CLONE_NEWNS");
1860 remount_all_slave();
1861 ret
= do_rootfs_setup(conf
, name
, lxcpath
);
1863 ERROR("Error setting up rootfs mount as root before spawn");
1864 goto out_fini_nonet
;
1866 INFO("Set up container rootfs as host root");
1870 ret
= lxc_spawn(handler
);
1872 ERROR("Failed to spawn container \"%s\"", name
);
1873 goto out_detach_blockdev
;
1875 /* close parent side of data socket */
1876 close(handler
->data_sock
[0]);
1877 handler
->data_sock
[0] = -1;
1878 close(handler
->data_sock
[1]);
1879 handler
->data_sock
[1] = -1;
1881 handler
->conf
->reboot
= 0;
1883 ret
= lxc_poll(name
, handler
);
1885 ERROR("LXC mainloop exited with error: %d", ret
);
1889 status
= lxc_wait_for_pid_status(handler
->pid
);
1891 SYSERROR("Failed to retrieve status for %d", handler
->pid
);
1893 /* If the child process exited but was not signaled, it didn't call
1894 * reboot. This should mean it was an lxc-execute which simply exited.
1895 * In any case, treat it as a 'halt'.
1897 if (WIFSIGNALED(status
)) {
1898 switch(WTERMSIG(status
)) {
1899 case SIGINT
: /* halt */
1900 DEBUG("Container \"%s\" is halting", name
);
1902 case SIGHUP
: /* reboot */
1903 DEBUG("Container \"%s\" is rebooting", name
);
1904 handler
->conf
->reboot
= 1;
1906 case SIGSYS
: /* seccomp */
1907 DEBUG("Container \"%s\" violated its seccomp policy", name
);
1910 DEBUG("Unknown exit status for container \"%s\" init %d", name
, WTERMSIG(status
));
1915 ret
= lxc_restore_phys_nics_to_netns(handler
);
1917 ERROR("Failed to move physical network devices back to parent "
1918 "network namespace");
1920 if (handler
->pinfd
>= 0) {
1921 close(handler
->pinfd
);
1922 handler
->pinfd
= -1;
1925 lxc_monitor_send_exit_code(name
, status
, handler
->lxcpath
);
1926 lxc_error_set_and_log(handler
->pid
, status
);
1928 *error_num
= handler
->exit_status
;
1931 lxc_delete_network(handler
);
1933 out_detach_blockdev
:
1934 detach_block_device(handler
->conf
);
1937 lxc_fini(name
, handler
);
1941 lxc_abort(name
, handler
);
1949 static int start(struct lxc_handler
*handler
, void* data
)
1951 struct start_args
*arg
= data
;
1953 NOTICE("Exec'ing \"%s\"", arg
->argv
[0]);
1955 execvp(arg
->argv
[0], arg
->argv
);
1956 SYSERROR("Failed to exec \"%s\"", arg
->argv
[0]);
1960 static int post_start(struct lxc_handler
*handler
, void* data
)
1962 struct start_args
*arg
= data
;
1964 NOTICE("Started \"%s\" with pid \"%d\"", arg
->argv
[0], handler
->pid
);
1968 static struct lxc_operations start_ops
= {
1970 .post_start
= post_start
1973 int lxc_start(const char *name
, char *const argv
[], struct lxc_handler
*handler
,
1974 const char *lxcpath
, bool backgrounded
, int *error_num
)
1976 struct start_args start_arg
= {
1980 TRACE("Doing lxc_start");
1981 return __lxc_start(name
, handler
, &start_ops
, &start_arg
, lxcpath
, backgrounded
, error_num
);
1984 static void lxc_destroy_container_on_signal(struct lxc_handler
*handler
,
1987 char destroy
[MAXPATHLEN
];
1988 struct lxc_container
*c
;
1992 if (handler
->conf
->rootfs
.path
&& handler
->conf
->rootfs
.mount
) {
1993 bret
= do_destroy_container(handler
);
1995 ERROR("Error destroying rootfs for container \"%s\"", name
);
1999 INFO("Destroyed rootfs for container \"%s\"", name
);
2001 ret
= snprintf(destroy
, MAXPATHLEN
, "%s/%s", handler
->lxcpath
, name
);
2002 if (ret
< 0 || ret
>= MAXPATHLEN
) {
2003 ERROR("Error destroying directory for container \"%s\"", name
);
2007 c
= lxc_container_new(name
, handler
->lxcpath
);
2009 if (container_disk_lock(c
)) {
2010 INFO("Could not update lxc_snapshots file");
2011 lxc_container_put(c
);
2013 mod_all_rdeps(c
, false);
2014 container_disk_unlock(c
);
2015 lxc_container_put(c
);
2019 if (!handler
->am_root
)
2020 ret
= userns_exec_full(handler
->conf
, lxc_rmdir_onedev_wrapper
,
2021 destroy
, "lxc_rmdir_onedev_wrapper");
2023 ret
= lxc_rmdir_onedev(destroy
, NULL
);
2026 ERROR("Error destroying directory for container \"%s\"", name
);
2029 INFO("Destroyed directory for container \"%s\"", name
);
2032 static int lxc_rmdir_onedev_wrapper(void *data
)
2034 char *arg
= (char *) data
;
2035 return lxc_rmdir_onedev(arg
, NULL
);
2038 static bool do_destroy_container(struct lxc_handler
*handler
)
2042 if (!handler
->am_root
) {
2043 ret
= userns_exec_full(handler
->conf
, storage_destroy_wrapper
,
2044 handler
->conf
, "storage_destroy_wrapper");
2051 return storage_destroy(handler
->conf
);