From: Dan Rosenberg Date: Fri, 29 Apr 2011 14:48:07 +0000 (+0100) Subject: ARM: 6891/1: prevent heap corruption in OABI semtimedop X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0f22072ab50cac7983f9660d33974b45184da4f9;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Russell King --- 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)