Copyright 2010 ProFUSION embedded systems
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "log.h"
#include "umount.h"
#include "util.h"
+#include "mkdir.h"
+#include "virt.h"
+#include "watchdog.h"
#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) {
+ char buf[PATH_MAX];
+ FILE *f;
+ char c;
+ size_t count;
+ uid_t uid;
+ int r;
+
+ /* We are PID 1, let's not commit suicide */
if (pid == 1)
return true;
- /* TODO: add more ignore rules here: device-mapper, etc */
+ r = get_process_uid(pid, &uid);
+ if (r < 0)
+ return true; /* not really, but better safe than sorry */
- return false;
-}
+ /* Non-root processes otherwise are always subject to be killed */
+ if (uid != 0)
+ return false;
-static bool is_kernel_thread(pid_t pid)
-{
- char buf[PATH_MAX];
- FILE *f;
- char c;
- size_t count;
+ snprintf(buf, sizeof(buf), "/proc/%lu/cmdline", (unsigned long) pid);
+ char_array_0(buf);
- snprintf(buf, sizeof(buf), "/proc/%lu/cmdline", (unsigned long)pid);
f = fopen(buf, "re");
if (!f)
return true; /* not really, but has the desired effect */
count = fread(&c, 1, 1, f);
fclose(f);
- return count != 1;
+
+ /* Kernel threads have an empty cmdline */
+ if (count <= 0)
+ return true;
+
+ /* Processes with argv[0][0] = '@' we ignore from the killing
+ * spree.
+ *
+ * http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons */
+ if (count == 1 && c == '@')
+ return true;
+
+ return false;
}
static int killall(int sign) {
struct dirent *d;
unsigned int n_processes = 0;
- if ((dir = opendir("/proc")) == NULL)
+ dir = opendir("/proc");
+ if (!dir)
return -errno;
while ((d = readdir(dir))) {
if (parse_pid(d->d_name, &pid) < 0)
continue;
- if (is_kernel_thread(pid))
- continue;
-
if (ignore_proc(pid))
continue;
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;
}
- 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("/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 bool pivot_to_new_root(void) {
+static int pivot_to_new_root(void) {
int fd;
- int r = 0;
+
chdir("/run/initramfs");
/*
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);
+
+ /* Initialize the controlling terminal */
+ setsid();
+ ioctl(STDIN_FILENO, TIOCSCTTY, NULL);
+ }
+
+ return 0;
}
int main(int argc, char *argv[]) {
int cmd, r;
unsigned retries;
bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
- bool killed_everbody = false, in_container;
+ bool killed_everbody = false, in_container, use_watchdog = false;
log_parse_environment();
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;
goto error;
}
+ use_watchdog = !!getenv("WATCHDOG_USEC");
+
/* lock us into memory */
if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
log_warning("Cannot lock process memory: %m");
for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
bool changed = false;
+ if (use_watchdog)
+ watchdog_ping();
+
if (need_umount) {
log_info("Unmounting file systems.");
r = umount_all(&changed);
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
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();