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ARM: 6891/1: prevent heap corruption in OABI semtimedop 

When CONFIG_OABI_COMPAT is set, the wrapper for semtimedop does not
bound the nsops argument.  A sufficiently large value will cause an
integer overflow in allocation size, followed by copying too much data
into the allocated buffer.  Fix this by restricting nsops to SEMOPM.
Untested.

Cc: stable@kernel.org
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Dan Rosenberg 2011-04-29 15:48:07 +01:00 committed by Russell King
parent 408133e9dc
commit 0f22072ab5
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/sys_oabi-compat.c
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@ -311,7 +311,7 @@ asmlinkage long sys_oabi_semtimedop(int semid,
long err;
int i;
if (nsops < 1)
if (nsops < 1 || nsops > SEMOPM)
return -EINVAL;
sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
if (!sops)