linux-kernel - Re: [PATCH v2 05/13] crypto: simd - Update `walksize` in simd skcipher

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Message-ID: <20231128035814.GH1463@sol.localdomain>
Date:   Mon, 27 Nov 2023 19:58:14 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jerry Shih <jerry.shih@...ive.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, conor.dooley@...rochip.com, ardb@...nel.org,
        heiko@...ech.de, phoebe.chen@...ive.com, hongrong.hsu@...ive.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 05/13] crypto: simd - Update `walksize` in simd
 skcipher

On Mon, Nov 27, 2023 at 03:06:55PM +0800, Jerry Shih wrote:
> The `walksize` assignment is missed in simd skcipher.
> 
> Signed-off-by: Jerry Shih <jerry.shih@...ive.com>
> ---
>  crypto/cryptd.c | 1 +
>  crypto/simd.c   | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/crypto/cryptd.c b/crypto/cryptd.c
> index bbcc368b6a55..253d13504ccb 100644
> --- a/crypto/cryptd.c
> +++ b/crypto/cryptd.c
> @@ -405,6 +405,7 @@ static int cryptd_create_skcipher(struct crypto_template *tmpl,
>  		(alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
>  	inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
>  	inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
> +	inst->alg.walksize = crypto_skcipher_alg_walksize(alg);
>  	inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
>  	inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
>  
> diff --git a/crypto/simd.c b/crypto/simd.c
> index edaa479a1ec5..ea0caabf90f1 100644
> --- a/crypto/simd.c
> +++ b/crypto/simd.c
> @@ -181,6 +181,7 @@ struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
>  
>  	alg->ivsize = ialg->ivsize;
>  	alg->chunksize = ialg->chunksize;
> +	alg->walksize = ialg->walksize;
>  	alg->min_keysize = ialg->min_keysize;
>  	alg->max_keysize = ialg->max_keysize;

What are the consequences of this bug?  I wonder if it actually matters?  The
"inner" algorithm is the one that actually gets used for the "walk", right?

- Eric