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init: fix signal handling

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The only signals we handle are SIGINT and SIGCHLD, so block all others
and unblock them in the child process before we start a rurnlevel.
This commit is contained in:
William Hubbs 2017-04-13 12:54:18 -05:00
parent 05738bfce1
commit 4694900190
1 changed files with 17 additions and 3 deletions
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20
src/rc/openrc-init.c
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@ -39,6 +39,7 @@ static const char *rc_default_runlevel = "default";
static pid_t do_openrc(const char *runlevel)
{
pid_t pid;
sigset_t signals;
pid = fork();
switch(pid) {
@ -47,6 +48,9 @@ static pid_t do_openrc(const char *runlevel)
break;
case 0:
setsid();
/* unblock all signals */
sigemptyset(&signals);
sigprocmask(SIG_SETMASK, &signals, NULL);
printf("Starting %s runlevel\n", runlevel);
execl("/sbin/openrc", "/sbin/openrc", runlevel, NULL);
perror("exec");
@ -135,11 +139,14 @@ int main(int argc, char **argv)
int count;
FILE *fifo;
bool reexec = false;
sigset_t signals;
struct sigaction sa;
if (getpid() != 1)
return 1;
printf("OpenRC init version %s starting\n", VERSION);
if (argc > 1)
default_runlevel = argv[1];
else
@ -148,15 +155,22 @@ int main(int argc, char **argv)
if (default_runlevel && strcmp(default_runlevel, "reexec") == 0)
reexec = true;
printf("OpenRC init version %s starting\n", VERSION);
if (! reexec)
init(default_runlevel);
/* block all signals we do not handle */
sigfillset(&signals);
sigdelset(&signals, SIGCHLD);
sigdelset(&signals, SIGINT);
sigprocmask(SIG_SETMASK, &signals, NULL);
/* install signal handler */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler;
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
reboot(RB_DISABLE_CAD);
if (! reexec)
init(default_runlevel);
if (mkfifo(RC_INIT_FIFO, 0600) == -1 && errno != EEXIST)
perror("mkfifo");