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Date: Tue, 05 May 2015 02:16:39 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, "Roman Gushchin" <klamm@...dex-team.ru>,
"Konstantin Khlebnikov" <khlebnikov@...dex-team.ru>,
"Rik van Riel" <riel@...hat.com>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
"Andrew Shewmaker" <agshew@...il.com>,
"Michal Hocko" <mhocko@...e.cz>
Subject: [PATCH 3.2 037/221] mm/mmap.c: fix arithmetic overflow in
__vm_enough_memory()
3.2.69-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Roman Gushchin <klamm@...dex-team.ru>
commit 5703b087dc8eaf47bfb399d6cf512d471beff405 upstream.
I noticed, that "allowed" can easily overflow by falling below 0,
because (total_vm / 32) can be larger than "allowed". The problem
occurs in OVERCOMMIT_NONE mode.
In this case, a huge allocation can success and overcommit the system
(despite OVERCOMMIT_NONE mode). All subsequent allocations will fall
(system-wide), so system become unusable.
The problem was masked out by commit c9b1d0981fcc
("mm: limit growth of 3% hardcoded other user reserve"),
but it's easy to reproduce it on older kernels:
1) set overcommit_memory sysctl to 2
2) mmap() large file multiple times (with VM_SHARED flag)
3) try to malloc() large amount of memory
It also can be reproduced on newer kernels, but miss-configured
sysctl_user_reserve_kbytes is required.
Fix this issue by switching to signed arithmetic here.
[akpm@...ux-foundation.org: use min_t]
Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>
Cc: Andrew Shewmaker <agshew@...il.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Reviewed-by: Michal Hocko <mhocko@...e.cz>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.2: there is no 'reserved' variable]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -111,7 +111,7 @@ struct percpu_counter vm_committed_as __
*/
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
{
- unsigned long free, allowed;
+ long free, allowed;
vm_acct_memory(pages);
--
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