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Message-ID: <20180408031935.GC25197@gondor.apana.org.au>
Date: Sun, 8 Apr 2018 11:19:35 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Salvatore Mesoraca <s.mesoraca16@...il.com>
Cc: linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
linux-crypto@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Kees Cook <keescook@...omium.org>,
Eric Biggers <ebiggers3@...il.com>,
Laura Abbott <labbott@...hat.com>
Subject: Re: [PATCH 2/6] crypto: ctr - avoid VLA use
On Sat, Apr 07, 2018 at 08:38:19PM +0200, Salvatore Mesoraca wrote:
>
> @@ -206,6 +207,14 @@ static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
> if (alg->cra_blocksize < 4)
> goto out_put_alg;
>
> + /* Block size must be <= MAX_BLOCKSIZE. */
> + if (alg->cra_blocksize > MAX_BLOCKSIZE)
> + goto out_put_alg;
> +
> + /* Alignmask must be <= MAX_ALIGNMASK. */
> + if (alg->cra_alignmask > MAX_ALIGNMASK)
> + goto out_put_alg;
> +
Since you're also adding a check to cipher algorithms in general,
none of these individual checks are needed anymore.
Cheers,
--
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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