diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2011-04-29 15:48:07 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-08-01 13:54:43 -0700 |
| commit | 00b450cca3cfa0495203f171e787d5c629cbaeac (patch) | |
| tree | 2773c6a13c997fb33f261e1b33a333efc011f792 | |
| parent | d282c26a7de21ea3b4df913be7a89035553ed846 (diff) | |
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -rw-r--r-- | arch/arm/kernel/sys_oabi-compat.c | 2 |
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 33ff678e32f2..73bb15cf7e32 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) |