linux-kernel - Re: [PATCH] crypto: gcm

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Date:   Thu, 30 May 2019 22:00:41 +0000
From:   Iuliana Prodan <iuliana.prodan@....com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
CC:     Eric Biggers <ebiggers@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Horia Geanta <horia.geanta@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] crypto: gcm - fix cacheline sharing

On 5/30/2019 6:05 PM, Ard Biesheuvel wrote:
> On Thu, 30 May 2019 at 16:34, Herbert Xu <herbert@...dor.apana.org.au> wrote:
>>
>> On Thu, May 30, 2019 at 04:31:09PM +0200, Ard Biesheuvel wrote:
>>>
>>> This might work:
>>
>> Looks good to me.
>>
> 
> Thanks Herbert,
> 
> But given your remark regarding CBC being the only algo that has this
> requirement, I wonder if this might be sufficient as well.
> 
> diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
> index c0ece44f303b..65b050e3742f 100644
> --- a/drivers/crypto/caam/caamalg.c
> +++ b/drivers/crypto/caam/caamalg.c
> @@ -1844,7 +1844,7 @@ static int skcipher_decrypt(struct skcipher_request *req)
>           * The crypto API expects us to set the IV (req->iv) to the last
>           * ciphertext block.
>           */
> -       if (ivsize)
> +       if (ctx->cdata.algtype & OP_ALG_AAI_CBC)
>                  scatterwalk_map_and_copy(req->iv, req->src, req->cryptlen -
>                                           ivsize, ivsize, 0);
> 
> 
> Iulia, Horia?
> 
I can confirm that gcm (and ccm), with ctr-aes-caam, is passing with the 
above fix.

Thanks,
Iulia