#include <getopt.h>
#include <signal.h>
#include <sys/wait.h>
+#include <fcntl.h>
#include "manager.h"
#include "log.h"
static bool crash_shell = false;
static int crash_chvt = -1;
+static bool confirm_spawn = false;
+
_noreturn static void freeze(void) {
for (;;)
pause();
}
+static void nop_handler(int sig) {
+}
+
_noreturn static void crash(int sig) {
if (!dump_core)
log_error("Caught <%s>, not dumping core.", strsignal(sig));
else {
+ struct sigaction sa;
pid_t pid;
+ /* We want to wait for the core process, hence let's enable SIGCHLD */
+ zero(sa);
+ sa.sa_handler = nop_handler;
+ sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
+ assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
+
if ((pid = fork()) < 0)
log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
else if (pid == 0) {
- struct sigaction sa;
struct rlimit rl;
/* Enable default signal handler for core dump */
chvt(crash_chvt);
if (crash_shell) {
+ struct sigaction sa;
+ pid_t pid;
+
log_info("Executing crash shell in 10s...");
sleep(10);
- execl("/bin/sh", "/bin/sh", NULL);
- log_error("execl() failed: %s", strerror(errno));
+ /* Let the kernel reap children for us */
+ zero(sa);
+ sa.sa_handler = SIG_IGN;
+ sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
+ assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
+
+ if ((pid = fork()) < 0)
+ log_error("Failed to fork off crash shell: %s", strerror(errno));
+ else if (pid == 0) {
+ execl("/bin/sh", "/bin/sh", NULL);
+
+ log_error("execl() failed: %s", strerror(errno));
+ _exit(1);
+ }
+
+ log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
}
log_info("Freezing execution.");
sa.sa_flags = SA_NODEFER;
assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
+ assert_se(sigaction(SIGILL, &sa, NULL) == 0);
+ assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
+ assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
+ assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
}
+static int console_setup(void) {
+ int tty_fd = -1, null_fd = -1, r = 0;
+
+ /* If we are init, we connect stdout/stderr to /dev/console
+ * and stdin to /dev/null and make sure we don't have a
+ * controlling tty. */
+
+ release_terminal();
+
+ if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
+ log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
+ r = -tty_fd;
+ goto finish;
+ }
+
+ if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
+ log_error("Failed to open /dev/null: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ assert(tty_fd >= 3);
+ assert(null_fd >= 3);
+
+ if (reset_terminal(tty_fd) < 0)
+ log_error("Failed to reset /dev/console: %m");
+
+ if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
+ dup2(tty_fd, STDERR_FILENO) < 0 ||
+ dup2(null_fd, STDIN_FILENO) < 0) {
+ log_error("Failed to dup2() device: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ if (tty_fd >= 0)
+ close_nointr(tty_fd);
+
+ if (null_fd >= 0)
+ close_nointr(null_fd);
+
+ return r;
+}
+
static int set_default_unit(const char *u) {
char *c;
else
crash_shell = r;
+
+ } else if (startswith(word, "systemd.confirm_spawn=")) {
+ int r;
+
+ if ((r = parse_boolean(word + 22)) < 0)
+ log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
+ else
+ confirm_spawn = r;
+
} else if (startswith(word, "systemd.crash_chvt=")) {
int k;
log_info("systemd.dump_core=0|1 Dump core on crash");
log_info("systemd.crash_shell=0|1 On crash run shell");
log_info("systemd.crash_chvt=N Change to VT #N on crash");
+ log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
} else {
unsigned i;
ARG_DEFAULT,
ARG_RUNNING_AS,
ARG_TEST,
- ARG_DUMP_CONFIGURATION_ITEMS
+ ARG_DUMP_CONFIGURATION_ITEMS,
+ ARG_CONFIRM_SPAWN
};
static const struct option options[] = {
{ "test", no_argument, NULL, ARG_TEST },
{ "help", no_argument, NULL, 'h' },
{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
+ { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
{ NULL, 0, NULL, 0 }
};
action = ACTION_DUMP_CONFIGURATION_ITEMS;
break;
+ case ARG_CONFIRM_SPAWN:
+ confirm_spawn = true;
+ break;
+
case 'h':
action = ACTION_HELP;
break;
" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
" --running-as=AS Set running as (init, system, session)\n"
" --test Determine startup sequence, dump it and exit\n"
- " --dump-configuration-items Dump understood unit configuration items\n",
+ " --dump-configuration-items Dump understood unit configuration items\n"
+ " --confirm-spawn Ask for confirmation when spawning processes\n",
__progname);
return 0;
/* Reset all signal handlers. */
assert_se(reset_all_signal_handlers() == 0);
+ /* If we are init, we can block sigkill. Yay. */
+ ignore_signal(SIGKILL);
+ ignore_signal(SIGPIPE);
+
/* Close all open files */
assert_se(close_all_fds(NULL, 0) == 0);
/* Move out of the way, so that we won't block unmounts */
assert_se(chdir("/") == 0);
- /* Become a session leader if we aren't one yet. */
- setsid();
+ if (running_as != MANAGER_SESSION) {
+ /* Become a session leader if we aren't one yet. */
+ setsid();
+
+ /* Disable the umask logic */
+ umask(0);
+ }
- /* Disable the umask logic */
- umask(0);
+ if (running_as == MANAGER_INIT)
+ console_setup();
/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
dbus_connection_set_change_sigpipe(FALSE);
log_open_syslog();
log_open_kmsg();
- /* Make sure we leave a core dump */
+ /* Make sure we leave a core dump without panicing the
+ * kernel. */
if (getpid() == 1)
install_crash_handler();
if (running_as == MANAGER_INIT)
hostname_setup();
- if ((r = manager_new(running_as, &m)) < 0) {
+ if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
log_error("Failed to allocate manager object: %s", strerror(-r));
goto finish;
}
log_debug("Activating default unit: %s", default_unit);
- if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
+ if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
log_error("Failed to load default target: %s", strerror(-r));
log_info("Trying to load rescue target...");
- if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
+ if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
log_error("Failed to load rescue target: %s", strerror(-r));
goto finish;
}
dbus_shutdown();
+ if (getpid() == 1)
+ freeze();
+
return retval;
}
~ianmdlvl / elogind.git / blobdiff