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rootless: block signals for pause

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block signals for the pause process, so it can't be killed by
mistake.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2019-05-23 12:09:25 +02:00
parent b1d590b441
commit ce26aa701f
1 changed files with 36 additions and 0 deletions
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36
pkg/rootless/rootless_linux.c
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@ -69,6 +69,19 @@ rootless_gid ()
static void
do_pause ()
{
int i;
struct sigaction act;
int const sig[] =
{
SIGALRM, SIGHUP, SIGINT, SIGPIPE, SIGQUIT, SIGTERM, SIGPOLL,
SIGPROF, SIGVTALRM, SIGXCPU, SIGXFSZ, 0
};
act.sa_handler = SIG_IGN;
for (i = 0; sig[i]; i++)
sigaction (sig[i], &act, NULL);
prctl (PR_SET_NAME, "podman pause", NULL, NULL, NULL);
while (1)
pause ();
@ -574,6 +587,7 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path)
char *listen_pid = NULL;
bool do_socket_activation = false;
char *cwd = getcwd (NULL, 0);
sigset_t sigset, oldsigset;
if (cwd == NULL)
{
@ -621,6 +635,22 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path)
return pid;
}
if (sigfillset (&sigset) < 0)
{
fprintf (stderr, "cannot fill sigset: %s\n", strerror (errno));
_exit (EXIT_FAILURE);
}
if (sigdelset (&sigset, SIGCHLD) < 0)
{
fprintf (stderr, "cannot sigdelset(SIGCHLD): %s\n", strerror (errno));
_exit (EXIT_FAILURE);
}
if (sigprocmask (SIG_BLOCK, &sigset, &oldsigset) < 0)
{
fprintf (stderr, "cannot block signals: %s\n", strerror (errno));
_exit (EXIT_FAILURE);
}
argv = get_cmd_line_args (ppid);
if (argv == NULL)
{
@ -685,6 +715,12 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path)
while (ret < 0 && errno == EINTR);
close (ready);
if (sigprocmask (SIG_SETMASK, &oldsigset, NULL) < 0)
{
fprintf (stderr, "cannot block signals: %s\n", strerror (errno));
_exit (EXIT_FAILURE);
}
execvp (argv[0], argv);
_exit (EXIT_FAILURE);