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

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Date:   Thu, 6 Jun 2019 08:42:46 +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, 6 Jun 2019 at 08:37, Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> On Thu, May 30, 2019 at 04:31:09PM +0200, Ard Biesheuvel wrote:
> >
> > This might work:
> >
> > diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
> > index c0ece44f303b..3d313d2a279a 100644
> > --- a/drivers/crypto/caam/caamalg.c
> > +++ b/drivers/crypto/caam/caamalg.c
> > @@ -1661,7 +1661,8 @@ static int aead_decrypt(struct aead_request *req)
> >   * allocate and map the skcipher extended descriptor for skcipher
> >   */
> >  static struct skcipher_edesc *skcipher_edesc_alloc(struct
> > skcipher_request *req,
> > -                                                  int desc_bytes)
> > +                                                  int desc_bytes,
> > +                                                  u8 const *input_iv)
> >  {
> >         struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
> >         struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
> > @@ -1745,7 +1746,7 @@ static struct skcipher_edesc
> > *skcipher_edesc_alloc(struct skcipher_request *req,
> >         /* Make sure IV is located in a DMAable area */
> >         if (ivsize) {
> >                 iv = (u8 *)edesc->hw_desc + desc_bytes + sec4_sg_bytes;
> > -               memcpy(iv, req->iv, ivsize);
> > +               memcpy(iv, input_iv, ivsize);
> >
> >                 iv_dma = dma_map_single(jrdev, iv, ivsize, DMA_TO_DEVICE);
> >                 if (dma_mapping_error(jrdev, iv_dma)) {
>
> Hi Ard:
>
> I presume you will be submitting this patch at some point?  When
> you do please base it on top of your other one which I'm about to
> merge.
>

I'm not sure I follow. Do you want a better fix for the CBC output IV
going forward? Or is this about other modes?