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[src/trunk]: src/sys/kern Avoid undefined behavior in lwp_ctl_free()
details: https://anonhg.NetBSD.org/src/rev/e1236fdc357e
branches: trunk
changeset: 833643:e1236fdc357e
user: kamil <kamil%NetBSD.org@localhost>
date: Wed Jul 04 18:15:27 2018 +0000
description:
Avoid undefined behavior in lwp_ctl_free()
Do not left shift signed integer in a way that the signedness bit is
changed.
sys/kern/kern_lwp.c:1892:29, left shift of 1 by 31 places cannot be represented in type 'int'
Detected with Kernel Undefined Behavior Sanitizer.
Reported by <Harry Pantazis>
diffstat:
sys/kern/kern_lwp.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diffs (27 lines):
diff -r 60653207bf21 -r e1236fdc357e sys/kern/kern_lwp.c
--- a/sys/kern/kern_lwp.c Wed Jul 04 18:13:01 2018 +0000
+++ b/sys/kern/kern_lwp.c Wed Jul 04 18:15:27 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_lwp.c,v 1.193 2018/07/04 18:13:01 kamil Exp $ */
+/* $NetBSD: kern_lwp.c,v 1.194 2018/07/04 18:15:27 kamil Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -211,7 +211,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.193 2018/07/04 18:13:01 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.194 2018/07/04 18:15:27 kamil Exp $");
#include "opt_ddb.h"
#include "opt_lockdebug.h"
@@ -1889,7 +1889,7 @@
mutex_enter(&lp->lp_lock);
lcp->lcp_nfree++;
map = offset >> 5;
- lcp->lcp_bitmap[map] |= (1 << (offset & 31));
+ lcp->lcp_bitmap[map] |= (1U << (offset & 31));
if (lcp->lcp_bitmap[lcp->lcp_rotor] == 0)
lcp->lcp_rotor = map;
if (TAILQ_FIRST(&lp->lp_pages)->lcp_nfree == 0) {
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