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-rw-r--r--src/shutdown.c143
1 files changed, 70 insertions, 73 deletions
diff --git a/src/shutdown.c b/src/shutdown.c
index 528b30b98f..c16871dde4 100644
--- a/src/shutdown.c
+++ b/src/shutdown.c
@@ -44,7 +44,6 @@
#define TIMEOUT_USEC (5 * USEC_PER_SEC)
#define FINALIZE_ATTEMPTS 50
-#define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old)
static bool ignore_proc(pid_t pid) {
if (pid == 1)
@@ -199,57 +198,58 @@ finish:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
}
-static bool prepare_new_root(void) {
- int r = false;
- const char *dirs[] = { "/run/initramfs/oldroot",
- "/run/initramfs/proc",
- "/run/initramfs/sys",
- "/run/initramfs/dev",
- "/run/initramfs/run",
- NULL };
- const char **dir;
- const char *msg;
-
- msg = "Failed to mount bind /run/initramfs on /run/initramfs";
- if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) != 0)
- goto out;
-
- msg="Failed to make /run/initramfs private mount %m:";
- if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) != 0)
- goto out;
-
- for (dir = &dirs[0]; *dir != NULL; dir++) {
- asprintf((char **) &msg, "mkdir %s: %%m", *dir);
- if (mkdir(*dir, 0755) != 0) {
- if (errno != EEXIST)
- goto out;
+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;
}
- free((char *) msg);
+
+ 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;
}
- msg = "Failed to mount bind /sys on /run/initramfs/sys";
- if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) != 0)
- goto out;
- msg = "Failed to mount bind /proc on /run/initramfs/proc";
- if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) != 0)
- goto out;
- msg = "Failed to mount bind /dev on /run/initramfs/dev";
- if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) != 0)
- goto out;
- msg = "Failed to mount bind /run on /run/initramfs/run";
- if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) != 0)
- goto out;
-
- r = true;
- out:
- if (!r)
- log_error("%s: %m", msg);
- return r;
+ 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 bool pivot_to_new_root(void) {
+static int pivot_to_new_root(void) {
int fd;
- int r = 0;
+
chdir("/run/initramfs");
/*
@@ -257,30 +257,29 @@ static bool pivot_to_new_root(void) {
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 false;
+ if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) {
+ log_error("Failed to make \"/\" private mount %m");
+ return -errno;
}
- r = pivot_root(".", "oldroot");
- if (r!=0) {
+ if (pivot_root(".", "oldroot") < 0) {
log_error("pivot failed: %m");
- /* only chroot, if pivot root succeded */
- return false;
+ /* only chroot if pivot root succeded */
+ return -errno;
}
+
chroot(".");
- log_info("pivot rooted");
-
- fd = open("dev/console", O_RDONLY);
- dup2(fd, STDIN_FILENO);
- close_nointr_nofail(fd);
- fd = open("dev/console", O_WRONLY);
- dup2(fd, STDOUT_FILENO);
- close_nointr_nofail(fd);
- fd = open("dev/console", O_WRONLY);
- dup2(fd, STDERR_FILENO);
- close_nointr_nofail(fd);
- return true;
+ 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);
+ close_nointr_nofail(fd);
+ }
+
+ return 0;
}
int main(int argc, char *argv[]) {
@@ -419,19 +418,17 @@ int main(int argc, char *argv[]) {
exit(0);
}
- sync();
-
if (access("/run/initramfs/shutdown", X_OK) == 0) {
- char *new_argv[3];
- new_argv[0] = strdup(argv[0]);
- new_argv[1] = strdup(argv[1]);
- new_argv[2] = NULL;
- if (prepare_new_root() && pivot_to_new_root()) {
- execv("/shutdown", new_argv);
+
+ if (prepare_new_root() >= 0 &&
+ pivot_to_new_root() >= 0) {
+ execv("/shutdown", argv);
log_error("Failed to execute shutdown binary: %m");
}
}
+ sync();
+
if (cmd == LINUX_REBOOT_CMD_KEXEC) {
/* We cheat and exec kexec to avoid doing all its work */
pid_t pid = fork();