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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Vitaly Chikunov <vt@altlinux.org>
Cc: David Howells <dhowells@redhat.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 02/11] crypto: akcipher - check the presence of callback before the call
Date: Thu, 21 Mar 2019 19:19:18 +0800	[thread overview]
Message-ID: <20190321111918.4kr7vdgz23xzjwed@gondor.apana.org.au> (raw)
In-Reply-To: <20190301175918.29694-3-vt@altlinux.org>

On Fri, Mar 01, 2019 at 08:59:09PM +0300, Vitaly Chikunov wrote:
> Because with introduction of EC-RDSA and change in workings of RSA in
> regard to sign/verify, akcipher could have not all callbacks defined,
> check the presence of callbacks before calling them to increase
> robustness.
> 
> Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
> ---
>  include/crypto/akcipher.h | 25 ++++++++++++++++---------
>  1 file changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
> index 2d690494568c..f537fad1989f 100644
> --- a/include/crypto/akcipher.h
> +++ b/include/crypto/akcipher.h
> @@ -268,7 +268,10 @@ static inline unsigned int crypto_akcipher_maxsize(struct crypto_akcipher *tfm)
>  {
>  	struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
>  
> -	return alg->max_size(tfm);
> +	if (alg->max_size)
> +		return alg->max_size(tfm);
> +	else
> +		return 0;
>  }

Please do these checks at registration time instead and provide
default implementations as needed.

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2019-03-21 11:19 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-01 17:59 [PATCH v7 00/11] crypto: add EC-RDSA (GOST 34.10) algorithm Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 01/11] KEYS: report to keyctl only actually supported key ops Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 02/11] crypto: akcipher - check the presence of callback before the call Vitaly Chikunov
2019-03-21 11:19   ` Herbert Xu [this message]
2019-03-21 11:42     ` Vitaly Chikunov
2019-03-21 12:11       ` Herbert Xu
2019-03-01 17:59 ` [PATCH v7 03/11] crypto: rsa - unimplement sign/verify for raw RSA backends Vitaly Chikunov
2019-03-22 22:41   ` Horia Geanta
2019-03-01 17:59 ` [PATCH v7 04/11] crypto: akcipher - new verify API for public key algorithms Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 05/11] KEYS: do not kmemdup digest in {public,tpm}_key_verify_signature Vitaly Chikunov
2019-03-22 19:49   ` Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 06/11] X.509: parse public key parameters from x509 for akcipher Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 07/11] crypto: Kconfig - create Public-key cryptography section Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 08/11] crypto: ecc - make ecc into separate module Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 09/11] crypto: ecrdsa - add EC-RDSA (GOST 34.10) algorithm Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 10/11] crypto: ecrdsa - add EC-RDSA test vectors to testmgr Vitaly Chikunov
2019-03-01 17:59 ` [PATCH v7 11/11] integrity: support EC-RDSA signatures for asymmetric_verify Vitaly Chikunov
2019-03-22 19:15   ` Vitaly Chikunov
2019-03-22 12:39 ` [PATCH v7 00/11] crypto: add EC-RDSA (GOST 34.10) algorithm Herbert Xu

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