linux-kernel - Re: [PATCH] crypto: sun8i-ss - remove redundant memzero

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Message-ID: <20200827080310.GA29222@Red>
Date:   Thu, 27 Aug 2020 10:03:10 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: sun8i-ss - remove redundant memzero_explicit()

On Thu, Aug 27, 2020 at 10:40:23AM +0300, Denis Efremov wrote:
> Remove redundant memzero_explicit() in sun8i_ss_cipher() before calling
> kfree_sensitive(). kfree_sensitive() will zero the memory with
> memzero_explicit().
> 
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
>  drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> index deb8b39a86db..ed2a69f82e1c 100644
> --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> @@ -248,7 +248,6 @@ static int sun8i_ss_cipher(struct skcipher_request *areq)
>  			offset = areq->cryptlen - ivsize;
>  			if (rctx->op_dir & SS_DECRYPTION) {
>  				memcpy(areq->iv, backup_iv, ivsize);
> -				memzero_explicit(backup_iv, ivsize);
>  				kfree_sensitive(backup_iv);
>  			} else {
>  				scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
> -- 
> 2.26.2
> 

Hello

Could you add:
Fixes: 453431a54934 ("mm, treewide: rename kzfree() to kfree_sensitive()")

Regards