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Date: Thu, 27 Oct 2011 15:00:24 +0530
From: Huzaifa Sidhpurwala <>
Subject: Re: CVE request: kernel: crypto: ghash: null pointer
 deref if no key is set

On 10/27/2011 02:40 PM, Eugene Teo wrote:
> Description from the commit: The ghash_update function passes a pointer
> to gf128mul_4k_lle which will be NULL if ghash_setkey is not called or
> if the most recent call to ghash_setkey failed to allocate memory.  This
> causes an oops.  Fix this up by returning an error code in the null case.
> This is trivially triggered from unprivileged userspace through the
> AF_ALG interface by simply writing to the socket without setting a key.
> The ghash_final function has a similar issue, but triggering it requires
> a memory allocation failure in ghash_setkey _after_ at least one
> successful call to ghash_update.
> References:
> Upstream commit:
> +config CRYPTO_GHASH
> was added in commit 2cdc6899, v2.6.32-rc1.

This has been assigned CVE-2011-4081

Huzaifa Sidhpurwala / Red Hat Security Response Team

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