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Date: Thu, 05 May 2011 17:25:56 -0700 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org Cc: stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Dan Rosenberg <drosenberg@...curity.com>, Russell King <rmk+kernel@....linux.org.uk> Subject: [35/43] ARM: 6891/1: prevent heap corruption in OABI semtimedop 2.6.33-longterm review patch. If anyone has any objections, please let us know. ------------------ From: Dan Rosenberg <drosenberg@...curity.com> 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@...curity.com> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- arch/arm/kernel/sys_oabi-compat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 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 long err; int i; - if (nsops < 1) + if (nsops < 1 || nsops > SEMOPM) return -EINVAL; sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL); if (!sops) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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