linux-kernel - Re: [Patch V4] crypto: x86/sha1 : Fix reads beyond the number of blocks passed

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Message-ID: <20170809135746.GH743@gondor.apana.org.au>
Date:   Wed, 9 Aug 2017 21:57:46 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Megha Dey <megha.dey@...ux.intel.com>
Cc:     tim.c.chen@...ux.intel.com, davem@...emloft.net,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        jstancek@...hat.com, ilya.albrekht@...el.com, megha.dey@...el.com
Subject: Re: [Patch V4] crypto: x86/sha1 : Fix reads beyond the number of
 blocks passed

On Wed, Aug 02, 2017 at 01:49:09PM -0700, Megha Dey wrote:
> It was reported that the sha1 AVX2 function(sha1_transform_avx2) is
> reading ahead beyond its intended data, and causing a crash if the next
> block is beyond page boundary:
> http://marc.info/?l=linux-crypto-vger&m=149373371023377
> 
> This patch makes sure that there is no overflow for any buffer length.
> 
> It passes the tests written by Jan Stancek that revealed this problem:
> https://github.com/jstancek/sha1-avx2-crash
> 
> I have re-enabled sha1-avx2 by reverting commit
> b82ce24426a4071da9529d726057e4e642948667
> 
> Originally-by: Ilya Albrekht <ilya.albrekht@...el.com>
> Tested-by: Jan Stancek <jstancek@...hat.com>
> Signed-off-by: Megha Dey <megha.dey@...ux.intel.com>
> Reported-by: Jan Stancek <jstancek@...hat.com>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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