linux-kernel - Re: [PATCH] crypto: hash - Add default handlers for digest, export, import

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 4 May 2023 17:35:39 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David Yang <mmyangfl@...il.com>
Cc:     linux-crypto@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: hash - Add default handlers for digest, export,
 import

On Thu, May 04, 2023 at 05:32:55PM +0800, David Yang wrote:
> The document of struct ahash_alg explicitly states that @finup,
> combination of @update and @final, is optional, while said nothing about
> @digest, which is combination of @init and @finup (@update and @final).
> 
> This gives a illusion that @digest might be optional. However
> crypto_ahash_init_tfm() strangely does expect a non-NULL @digest,
> otherwise it'll result in NULL pointer dereference.
> 
> Add default handlers for digest, export, import according to the behavior
> in the document, and mark them optional.
> 
> Signed-off-by: David Yang <mmyangfl@...il.com>
> ---
>  crypto/ahash.c        | 28 +++++++++++++++++++++++++---
>  include/crypto/hash.h | 12 ++++++------
>  2 files changed, 31 insertions(+), 9 deletions(-)

Nack.  There is a default for finup because finup was added later.
Every driver should implement all of the methods.

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