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From:   Iuliana Prodan <iuliana.prodan@nxp.com>
To:     Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Herbert Xu <herbert@gondor.apana.org.au>
CC:     Eric Biggers <ebiggers@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Horia Geanta <horia.geanta@nxp.com>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH] crypto: gcm - fix cacheline sharing
Thread-Topic: [PATCH] crypto: gcm - fix cacheline sharing
Thread-Index: AQHVFkF/PjPULMOhfkiEXDJZ6fiBzQ==
Date:   Thu, 30 May 2019 22:00:41 +0000
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On 5/30/2019 6:05 PM, Ard Biesheuvel wrote:=0A=
> On Thu, 30 May 2019 at 16:34, Herbert Xu <herbert@gondor.apana.org.au> wr=
ote:=0A=
>>=0A=
>> On Thu, May 30, 2019 at 04:31:09PM +0200, Ard Biesheuvel wrote:=0A=
>>>=0A=
>>> This might work:=0A=
>>=0A=
>> Looks good to me.=0A=
>>=0A=
> =0A=
> Thanks Herbert,=0A=
> =0A=
> But given your remark regarding CBC being the only algo that has this=0A=
> requirement, I wonder if this might be sufficient as well.=0A=
> =0A=
> diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.=
c=0A=
> index c0ece44f303b..65b050e3742f 100644=0A=
> --- a/drivers/crypto/caam/caamalg.c=0A=
> +++ b/drivers/crypto/caam/caamalg.c=0A=
> @@ -1844,7 +1844,7 @@ static int skcipher_decrypt(struct skcipher_request=
 *req)=0A=
>           * The crypto API expects us to set the IV (req->iv) to the last=
=0A=
>           * ciphertext block.=0A=
>           */=0A=
> -       if (ivsize)=0A=
> +       if (ctx->cdata.algtype & OP_ALG_AAI_CBC)=0A=
>                  scatterwalk_map_and_copy(req->iv, req->src, req->cryptle=
n -=0A=
>                                           ivsize, ivsize, 0);=0A=
> =0A=
> =0A=
> Iulia, Horia?=0A=
> =0A=
I can confirm that gcm (and ccm), with ctr-aes-caam, is passing with the =
=0A=
above fix.=0A=
=0A=
Thanks,=0A=
Iulia=0A=