Re: [PATCH 1/2] crypto: inside-secure - fix invalidation check in hmac_sha1_setkey

[Antoine Tenart <antoine.tenart@free-electrons.com>]

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Hi,

On Mon, Jul 17, 2017 at 11:45:19AM +0200, Antoine Tenart wrote:
> The safexcel_hmac_sha1_setkey function checks if an invalidation command
> should be issued, i.e. when the context ipad/opad change. This checks is
> done after filling the ipad/opad which and it can't be true. The patch
> fixes this by moving the check before the ipad/opad memcpy operations.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>

This patch should have stable: and fixes: tags. I'll add them and send a
v2.

Thanks,
Antoine

> ---
>  drivers/crypto/inside-secure/safexcel_hash.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c
> index 8527a5899a2f..a11b2edb41b9 100644
> --- a/drivers/crypto/inside-secure/safexcel_hash.c
> +++ b/drivers/crypto/inside-secure/safexcel_hash.c
> @@ -883,9 +883,6 @@ static int safexcel_hmac_sha1_setkey(struct crypto_ahash *tfm, const u8 *key,
>  	if (ret)
>  		return ret;
>  
> -	memcpy(ctx->ipad, &istate.state, SHA1_DIGEST_SIZE);
> -	memcpy(ctx->opad, &ostate.state, SHA1_DIGEST_SIZE);
> -
>  	for (i = 0; i < ARRAY_SIZE(istate.state); i++) {
>  		if (ctx->ipad[i] != le32_to_cpu(istate.state[i]) ||
>  		    ctx->opad[i] != le32_to_cpu(ostate.state[i])) {
> @@ -894,6 +891,9 @@ static int safexcel_hmac_sha1_setkey(struct crypto_ahash *tfm, const u8 *key,
>  		}
>  	}
>  
> +	memcpy(ctx->ipad, &istate.state, SHA1_DIGEST_SIZE);
> +	memcpy(ctx->opad, &ostate.state, SHA1_DIGEST_SIZE);
> +
>  	return 0;
>  }
>  
> -- 
> 2.13.3
> 

-- 
Antoine Ténart, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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