1 files changed, 17 insertions, 8 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 7fe874d12fae..bfdb5686fa3e 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -791,22 +791,31 @@ out:
 /*
  * Force a signal that the process can't ignore: if necessary
  * we unblock the signal and change any SIG_IGN to SIG_DFL.
+ *
+ * Note: If we unblock the signal, we always reset it to SIG_DFL,
+ * since we do not want to have a signal handler that was blocked
+ * be invoked when user space had explicitly blocked it.
+ *
+ * We don't want to have recursive SIGSEGV's etc, for example.
  */
-
 int
 force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
 {
         unsigned long int flags;
-        int ret;
+        int ret, blocked, ignored;
+        struct k_sigaction *action;
 
         spin_lock_irqsave(&t->sighand->siglock, flags);
-        if (t->sighand->action[sig-1].sa.sa_handler == SIG_IGN) {
-                t->sighand->action[sig-1].sa.sa_handler = SIG_DFL;
-        }
-        if (sigismember(&t->blocked, sig)) {
-                sigdelset(&t->blocked, sig);
+        action = &t->sighand->action[sig-1];
+        ignored = action->sa.sa_handler == SIG_IGN;
+        blocked = sigismember(&t->blocked, sig);
+        if (blocked || ignored) {
+                action->sa.sa_handler = SIG_DFL;
+                if (blocked) {
+                        sigdelset(&t->blocked, sig);
+                        recalc_sigpending_tsk(t);
+                }
         }
-        recalc_sigpending_tsk(t);
         ret = specific_send_sig_info(sig, info, t);
         spin_unlock_irqrestore(&t->sighand->siglock, flags);