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Handle the possibility of the siginfo parameter in sa_sigaction

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handler being NULL.
This commit is contained in:
Todd C. Miller
2017-05-12 10:02:17 -06:00
parent 2a55808775
commit 9d4a92b9b4
2 changed files with 15 additions and 4 deletions
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16
lib/util/event.c
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@@ -114,7 +114,13 @@ sudo_ev_activate_sigevents(struct sudo_event_base *base)
TAILQ_FOREACH(ev, &base->signals[i], entries) {
if (ISSET(ev->events, SUDO_EV_SIGINFO)) {
struct sudo_ev_siginfo_container *sc = ev->closure;
memcpy(&sc->siginfo, base->siginfo[i], sizeof(sc->siginfo));
if (base->siginfo[i]->si_signo == 0) {
/* No siginfo available. */
sc->siginfo = NULL;
} else {
sc->siginfo = (siginfo_t *)sc->si_buf;
memcpy(sc->siginfo, base->siginfo[i], sizeof(siginfo_t));
}
}
/* Make event active. */
ev->revents = ev->events & (SUDO_EV_SIGNAL|SUDO_EV_SIGINFO);
@@ -248,7 +254,7 @@ sudo_ev_alloc_v1(int fd, short events, sudo_ev_callback_t callback, void *closur
/* For SUDO_EV_SIGINFO we use a container to store closure + siginfo_t */
if (ISSET(events, SUDO_EV_SIGINFO)) {
struct sudo_ev_siginfo_container *container =
malloc(sizeof(*container));
malloc(sizeof(*container) + sizeof(siginfo_t) - 1);
if (container == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"%s: unable to allocate siginfo container", __func__);
@@ -290,8 +296,12 @@ sudo_ev_handler(int signo, siginfo_t *info, void *context)
/*
* Update signals_pending[] and siginfo[].
* All signals must be blocked any time siginfo[] is accessed.
* If no siginfo available, zero out the struct in base.
*/
memcpy(signal_base->siginfo[signo], info, sizeof(*info));
if (info == NULL)
memset(signal_base->siginfo[signo], 0, sizeof(*info));
else
memcpy(signal_base->siginfo[signo], info, sizeof(*info));
signal_base->signal_pending[signo] = 1;
signal_base->signal_caught = 1;