diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2011-04-29 18:48:07 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-04-29 18:53:14 +0400 |
| commit | 0f22072ab50cac7983f9660d33974b45184da4f9 (patch) | |
| tree | 59c175c63787b9b0424c40064df02cda7fe72a24 | |
| parent | 408133e9dca2b94c64b917b144ec816df913a94e (diff) | |
| download | linux-0f22072ab50cac7983f9660d33974b45184da4f9.tar.xz | |
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>
| -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 4ad8da15ef2b..af0aaebf4de6 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) |