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

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Date:   Thu, 30 May 2019 17:04:51 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Iuliana Prodan <iuliana.prodan@....com>,
        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 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?