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Message-Id: <20091217011609.364392349@mini.kroah.org>
Date: Wed, 16 Dec 2009 17:15:38 -0800
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...nel.org
Cc: stable-review@...nel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
WANG Cong <amwang@...hat.com>, Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
James Morris <jmorris@...ei.org>,
Alexey Dobriyan <adobriyan@...il.com>
Subject: [87/90] sysctl_max_map_count should be non-negative
2.6.31-stable review patch. If anyone has any objections, please let us know.
------------------
From: Amerigo Wang <amwang@...hat.com>
commit 70da2340fbc68e91e701762f785479ab495a0869 upstream.
Jan Engelhardt reported we have this problem:
setting max_map_count to a value large enough results in programs dying at
first try. This is on 2.6.31.6:
15:59 borg:/proc/sys/vm # echo $[1<<31-1] >max_map_count
15:59 borg:/proc/sys/vm # cat max_map_count
1073741824
15:59 borg:/proc/sys/vm # echo $[1<<31] >max_map_count
15:59 borg:/proc/sys/vm # cat max_map_count
Killed
This is because we have a chance to make 'max_map_count' negative. but
it's meaningless. Make it only accept non-negative values.
Reported-by: Jan Engelhardt <jengelh@...ozas.de>
Signed-off-by: WANG Cong <amwang@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: James Morris <jmorris@...ei.org>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
kernel/sysctl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1539,7 +1539,8 @@ static struct ctl_table debug_table[] =
.data = &show_unhandled_signals,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec
+ .proc_handler = proc_dointvec,
+ .extra1 = &zero,
},
#endif
{ .ctl_name = 0 }
--
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