X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshutdown.c;h=11213f9d595a288c57e3d803d3ed8d21ff16a115;hb=75d3fc60f88e08bf953063819a8a04b881d6db23;hp=df2d850afd0bffb82030b7eabcbf273f0b96cae3;hpb=40e85d00198c4d9305bbfc794b384f8174fae300;p=elogind.git diff --git a/src/shutdown.c b/src/shutdown.c index df2d850af..11213f9d5 100644 --- a/src/shutdown.c +++ b/src/shutdown.c @@ -24,6 +24,11 @@ #include #include #include +#include +#include +#include +#include +#include #include #include #include @@ -32,9 +37,11 @@ #include #include +#include "missing.h" #include "log.h" #include "umount.h" #include "util.h" +#include "virt.h" #define TIMEOUT_USEC (5 * USEC_PER_SEC) #define FINALIZE_ATTEMPTS 50 @@ -192,6 +199,93 @@ finish: sigprocmask(SIG_SETMASK, &oldmask, NULL); } +static int prepare_new_root(void) { + static const char dirs[] = + "/run/initramfs/oldroot\0" + "/run/initramfs/proc\0" + "/run/initramfs/sys\0" + "/run/initramfs/dev\0" + "/run/initramfs/run\0"; + + const char *dir; + + if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) { + log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m"); + return -errno; + } + + if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) { + log_error("Failed to make /run/initramfs private mount: %m"); + return -errno; + } + + NULSTR_FOREACH(dir, dirs) + if (mkdir_p(dir, 0755) < 0 && errno != EEXIST) { + log_error("Failed to mkdir %s: %m", dir); + return -errno; + } + + if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) < 0) { + log_error("Failed to mount bind /sys on /run/initramfs/sys: %m"); + return -errno; + } + + if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) < 0) { + log_error("Failed to mount bind /proc on /run/initramfs/proc: %m"); + return -errno; + } + + if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) < 0) { + log_error("Failed to mount bind /dev on /run/initramfs/dev: %m"); + return -errno; + } + + if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) < 0) { + log_error("Failed to mount bind /run on /run/initramfs/run: %m"); + return -errno; + } + + return 0; +} + +static int pivot_to_new_root(void) { + int fd; + + chdir("/run/initramfs"); + + /* + In case some evil process made "/" MS_SHARED + It works for pivot_root, but the ref count for the root device + is not decreasing :-/ + */ + if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) { + log_error("Failed to make \"/\" private mount %m"); + return -errno; + } + + if (pivot_root(".", "oldroot") < 0) { + log_error("pivot failed: %m"); + /* only chroot if pivot root succeded */ + return -errno; + } + + chroot("."); + log_info("Successfully changed into root pivot."); + + fd = open("/dev/console", O_RDWR); + if (fd < 0) + log_error("Failed to open /dev/console: %m"); + else { + make_stdio(fd); + + /* Initialize the controlling terminal */ + setsid(); + ioctl(STDIN_FILENO, TIOCSCTTY, NULL); + } + + return 0; +} + int main(int argc, char *argv[]) { int cmd, r; unsigned retries; @@ -202,6 +296,8 @@ int main(int argc, char *argv[]) { log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */ log_open(); + umask(0022); + if (getpid() != 1) { log_error("Not executed by init (pid 1)."); r = -EPERM; @@ -291,9 +387,12 @@ int main(int argc, char *argv[]) { log_error("Failed to detach DM devices: %s", strerror(-r)); } - if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) + if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) { + if (retries > 0) + log_info("All filesystems, swaps, loop devices, DM devices detached."); /* Yay, done */ break; + } /* If in this iteration we didn't manage to * unmount/deactivate anything, we either kill more @@ -323,8 +422,19 @@ int main(int argc, char *argv[]) { /* If we are in a container, just exit, this will kill our * container for good. */ - if (in_container) + if (in_container) { + log_error("Exiting container."); exit(0); + } + + if (access("/run/initramfs/shutdown", X_OK) == 0) { + + if (prepare_new_root() >= 0 && + pivot_to_new_root() >= 0) { + execv("/shutdown", argv); + log_error("Failed to execute shutdown binary: %m"); + } + } sync();