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From:   Horia Geanta <horia.geanta@nxp.com>
To:     Iuliana Prodan <iuliana.prodan@nxp.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@nxp.com>
CC:     "David S. Miller" <davem@davemloft.net>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v3 10/14] crypto: caam - fix MDHA key derivation for
 certain user key lengths
Thread-Topic: [PATCH v3 10/14] crypto: caam - fix MDHA key derivation for
 certain user key lengths
Thread-Index: AQHVQvEQ8S5ZgmW6u06kgrYkZT+jBg==
Date:   Fri, 26 Jul 2019 15:04:14 +0000
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On 7/25/2019 4:58 PM, Iuliana Prodan wrote:=0A=
> From: Horia Geant=E3 <horia.geanta@nxp.com>=0A=
> =0A=
> Fuzz testing uncovered an issue when |user key| > |derived key|.=0A=
> Derived key generation has to be fixed in two cases:=0A=
> =0A=
> 1. Era >=3D 6 (DKP is available)=0A=
> DKP cannot be used with immediate input key if |user key| > |derived key|=
,=0A=
> since the resulting descriptor (after DKP execution) would be invalid -=
=0A=
> having a few bytes from user key left in descriptor buffer=0A=
> as incorrect opcodes.=0A=
> =0A=
> Fix DKP usage both in standalone hmac and in authenc algorithms.=0A=
> For authenc the logic is simplified, by always storing both virtual=0A=
> and dma key addresses.=0A=
> =0A=
> 2. Era < 6=0A=
> The same case (|user key| > |derived key|) fails when DKP=0A=
> is not available.=0A=
> Make sure gen_split_key() dma maps max(|user key|, |derived key|),=0A=
> since this is an in-place (bidirectional) operation.=0A=
> =0A=
> Signed-off-by: Horia Geant=E3 <horia.geanta@nxp.com>=0A=
> =0A=
> Changes since v2:=0A=
> - fix MDHA key derivation for CAAM with era < 6.=0A=
> ---=0A=
The change log shouldn't be included in the commit message.=0A=
=0A=
Horia=0A=