linux-kernel - Re: [PATCH v3] crypto: ecc - Prevent ecc_digits_from

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Message-ID: <Zkc4HKGhDMV4cVOC@gondor.apana.org.au>
Date: Fri, 17 May 2024 18:57:32 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Stefan Berger <stefanb@...ux.ibm.com>
Cc: keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org, lukas@...ner.de,
	jarkko@...nel.org
Subject: Re: [PATCH v3] crypto: ecc - Prevent ecc_digits_from_bytes from
 reading too many bytes

On Thu, May 09, 2024 at 09:59:21PM -0400, Stefan Berger wrote:
> Prevent ecc_digits_from_bytes from reading too many bytes from the input
> byte array in case an insufficient number of bytes is provided to fill the
> output digit array of ndigits. Therefore, initialize the most significant
> digits with 0 to avoid trying to read too many bytes later on. Convert the
> function into a regular function since it is getting too big for an inline
> function.
> 
> If too many bytes are provided on the input byte array the extra bytes
> are ignored since the input variable 'ndigits' limits the number of digits
> that will be filled.
> 
> Fixes: d67c96fb97b5 ("crypto: ecdsa - Convert byte arrays with key coordinates to digits")
> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> 
> ---
> v3:
>  - Applied Jarkko's tag
> 
> v2:
>  - un-inline function
>  - use memset
> ---
>  crypto/ecc.c                  | 22 ++++++++++++++++++++++
>  include/crypto/internal/ecc.h | 15 ++-------------
>  2 files changed, 24 insertions(+), 13 deletions(-)

Patch applied.  Thanks.
-- 
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