linux-kernel - Re: [PATCH 3/6] crypto: api

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Date:   Mon, 9 Apr 2018 15:27:03 +0200
From:   Salvatore Mesoraca <s.mesoraca16@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     linux-kernel@...r.kernel.org,
        Kernel Hardening <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 3/6] crypto: api - avoid VLA use

2018-04-08 11:22 GMT+02:00 Herbert Xu <herbert@...dor.apana.org.au>:
> On Sun, Apr 08, 2018 at 11:07:12AM +0200, Salvatore Mesoraca wrote:
>>
>> > This check should be done when the algorithm is registered.  Perhaps
>> > crypto_check_alg.
>>
>> Please correct me if I'm wrong:
>> isn't crypto_check_alg invoked also during hashing algorithm registration?
>> In this patch-set I'm dealing only with ciphers, because the maximum
>> block size (16)
>> is relatively small and it's also the most common block size with
>> ciphers (maybe I should
>> have explicitly referenced ciphers in the macro names, my bad).
>> I don't think that it would be OK to use a similar approach for hashes
>> too, because some
>> of them have block size >= 1024 bytes.
>
> Yes we want to make it for ciphers only even if we move it to
> crypto_check_alg.
>
> For a legacy type like cipher cou can do it by
>
>         if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
>                               CRYPTO_ALG_TYPE_CIPHER)
>                 do_cipher_specific_check();
>

Thank you very much for your help.
I'm sending the new version.

Salvatore