linux-kernel - Re: [PATCH v2] drivers/crypto/nx: saves chaining value from co-processor

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Date:	Fri, 09 Aug 2013 16:25:04 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Fionnuala Gunter <fin@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, herbert@...dor.hengli.com.au,
	mhcerri@...ux.vnet.ibm.com
Subject: Re: [PATCH v2] drivers/crypto/nx: saves chaining value from
 co-processor

On Wed, 2013-08-07 at 18:15 -0500, Fionnuala Gunter wrote:
> This patch fixes a bug that is triggered when cts(cbc(aes)) is used with
> nx-crypto driver on input larger than 32 bytes.
> 
> The chaining value from co-processor was not being saved. This value is
> needed because it is used as the IV by cts(cbc(aes)).
> 
> Signed-off-by: Fionnuala Gunter <fin@...ux.vnet.ibm.com>
> Reviewed-by: Marcelo Cerri <mhcerri@...ux.vnet.ibm.com>

Herbert, I assume you will handle this along with all the other NX fixes
and I can safely take them out of linuxppc patchwork ?

Cheers,
Ben.

> ---
> v2. changed signed-off-by to reviewed-by and added more details to
> description
> 
> This bug appeared in the original submission (v3.5)
> ---
>  drivers/crypto/nx/nx-aes-cbc.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/crypto/nx/nx-aes-cbc.c
> b/drivers/crypto/nx/nx-aes-cbc.c
> index 35d483f..a2f99a9 100644
> --- a/drivers/crypto/nx/nx-aes-cbc.c
> +++ b/drivers/crypto/nx/nx-aes-cbc.c
> @@ -95,6 +95,7 @@ static int cbc_aes_nx_crypt(struct blkcipher_desc
> *desc,
>         if (rc)
>                 goto out;
> 
> +       memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
>         atomic_inc(&(nx_ctx->stats->aes_ops));
>         atomic64_add(csbcpb->csb.processed_byte_count,
>                      &(nx_ctx->stats->aes_bytes));


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