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authorDan Rosenberg <drosenberg@vsecurity.com>2011-04-29 15:48:07 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-09 15:06:47 -0700
commit36f96751ce09f4ab400e93408cc602d2e080a799 (patch)
tree7549cca63a92435f5dbe2a66c9fe7c3e942b75af /arch
parent7a1bbc3614696ea5e90d728f570f3ded8d49b487 (diff)
downloadlinux-2.6.38-lt-ux500-36f96751ce09f4ab400e93408cc602d2e080a799.tar.gz
ARM: 6891/1: prevent heap corruption in OABI semtimedop
commit 0f22072ab50cac7983f9660d33974b45184da4f9 upstream. 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. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/sys_oabi-compat.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
index 4ad8da15ef2..af0aaebf4de 100644
--- a/arch/arm/kernel/sys_oabi-compat.c
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -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)