From 28d4992f851dc49b5d98e6bfd77e7517f03b3507 Mon Sep 17 00:00:00 2001
From: Philip Guenther <guenther@cvs.openbsd.org>
Date: Thu, 14 Jul 2016 05:55:09 +0000
Subject: Prevent silly states via knotes on pids > 2^32 and on nonexistent
 signals.

ok tedu@
---
 sys/kern/kern_sig.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'sys/kern/kern_sig.c')

diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index 0d9eb786495..374e58d9bc4 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_sig.c,v 1.201 2016/07/06 15:53:01 tedu Exp $	*/
+/*	$OpenBSD: kern_sig.c,v 1.202 2016/07/14 05:55:08 guenther Exp $	*/
 /*	$NetBSD: kern_sig.c,v 1.54 1996/04/22 01:38:32 christos Exp $	*/
 
 /*
@@ -1824,6 +1824,9 @@ filt_sigattach(struct knote *kn)
 {
 	struct process *pr = curproc->p_p;
 
+	if (kn->kn_id >= NSIG)
+		return EINVAL;
+
 	kn->kn_ptr.p_process = pr;
 	kn->kn_flags |= EV_CLEAR;		/* automatically set */
 
-- 
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