linux-kernel - Re: [PATCH] crypto: caam - fix the address of the last entry of S/G

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Message-ID: <023d6704-557f-d701-a19b-2edcb002bf6c@nxp.com>
Date:   Tue, 7 Apr 2020 21:55:55 +0300
From:   Horia Geantă <horia.geanta@....com>
To:     Iuliana Prodan <iuliana.prodan@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Silvano Di Ninno <silvano.dininno@....com>,
        Franck Lenormand <franck.lenormand@....com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] crypto: caam - fix the address of the last entry of S/G

On 4/7/2020 6:59 PM, Iuliana Prodan wrote:
> For skcipher algorithms, the input, output HW S/G tables
> look like this: [IV, src][dst, IV]
> Now, we can have 2 conditions here:
> - there is no IV;
> - src and dst are equal (in-place encryption) and scattered
> and the error is an "off-by-one" in the HW S/G table.
> 
> This issue was seen with KASAN:
> BUG: KASAN: slab-out-of-bounds in skcipher_edesc_alloc+0x95c/0x1018
> 
> Read of size 4 at addr ffff000022a02958 by task cryptomgr_test/321
> 
> CPU: 2 PID: 321 Comm: cryptomgr_test Not tainted
> 5.6.0-rc1-00165-ge4ef8383-dirty #4
Non-public SHA1, dirty tree.

Probably it's not reproducible without applying previous fixes?
https://patchwork.kernel.org/project/linux-crypto/list/?series=266561

> Fixes: 334d37c9e263 ("crypto: caam - update IV using HW support")
> Cc: <stable@...r.kernel.org> # v5.3+
> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
Reviewed-by: Horia Geantă <horia.geanta@....com>

Thanks,
Horia