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Fix for heap_use_after_free flagged by sanitizer #54679

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merged 1 commit into from
Jun 24, 2021
Merged

Fix for heap_use_after_free flagged by sanitizer #54679

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24 changes: 19 additions & 5 deletions src/mono/mono/mini/mini-posix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -135,18 +135,31 @@ mono_runtime_shutdown_handlers (void)
static GHashTable *mono_saved_signal_handlers = NULL;

static struct sigaction *
get_saved_signal_handler (int signo, gboolean remove)
get_saved_signal_handler (int signo)
{
if (mono_saved_signal_handlers) {
/* The hash is only modified during startup, so no need for locking */
struct sigaction *handler = (struct sigaction*)g_hash_table_lookup (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
if (remove && handler)
g_hash_table_remove (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
return handler;
}
return NULL;
}


static void
remove_saved_signal_handler (int signo)
{
if (mono_saved_signal_handlers) {
/* The hash is only modified during startup, so no need for locking */
struct sigaction *handler = (struct sigaction*)g_hash_table_lookup (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
if (handler)
g_hash_table_remove (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
}
return;
}



static void
save_old_signal_handler (int signo, struct sigaction *old_action)
{
Expand Down Expand Up @@ -181,7 +194,7 @@ gboolean
MONO_SIG_HANDLER_SIGNATURE (mono_chain_signal)
{
int signal = MONO_SIG_HANDLER_GET_SIGNO ();
struct sigaction *saved_handler = (struct sigaction *)get_saved_signal_handler (signal, FALSE);
struct sigaction *saved_handler = (struct sigaction *)get_saved_signal_handler (signal);

if (saved_handler && saved_handler->sa_handler) {
if (!(saved_handler->sa_flags & SA_SIGINFO)) {
Expand Down Expand Up @@ -376,7 +389,7 @@ static void
remove_signal_handler (int signo)
{
struct sigaction sa;
struct sigaction *saved_action = get_saved_signal_handler (signo, TRUE);
struct sigaction *saved_action = get_saved_signal_handler (signo);

if (!saved_action) {
sa.sa_handler = SIG_DFL;
Expand All @@ -387,6 +400,7 @@ remove_signal_handler (int signo)
} else {
g_assert (sigaction (signo, saved_action, NULL) != -1);
}
remove_saved_signal_handler(signo);
}

void
Expand Down