From: Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH 03/18] asymmetric keys: separate the length checking of
 octet string from RSA_I2OSP
Date: Sun, 25 Aug 2013 18:01:47 +0200
Message-ID: <20130825160147.GB5171@amd.pavel.ucw.cz>
References: <1377169317-5959-1-git-send-email-jlee@suse.com>
 <1377169317-5959-4-git-send-email-jlee@suse.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-crypto@vger.kernel.org,
	opensuse-kernel@opensuse.org, David Howells <dhowells@redhat.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Len Brown <len.brown@intel.com>,
	Josh Boyer <jwboyer@redhat.com>,
	Vojtech Pavlik <vojtech@suse.cz>,
	Matt Fleming <matt.fleming@intel.com>,
	James Bottomley <james.bottomley@hansenpartnership.com>,
	Greg KH <gregkh@linuxfoundation.org>, JKosina@suse.com,
	Rusty Russell <rusty@rustcorp.com.au>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	"H. Peter Anvin" <hpa@zytor.com>, Michal Marek <mmarek@suse.cz>,
	Gary Lin <GLin@suse.com>, Vivek Goyal <vgoyal@redhat.com>,
	"Lee, Chun-Yi" <jlee@suse.com>
To: "Lee, Chun-Yi" <joeyli.kernel@gmail.com>
Return-path: <linux-security-module-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <1377169317-5959-4-git-send-email-jlee@suse.com>
Sender: linux-security-module-owner@vger.kernel.org
List-Id: linux-crypto.vger.kernel.org

On Thu 2013-08-22 19:01:42, Lee, Chun-Yi wrote:
> Due to RSA_I2OSP is not only used by signature verification path but also used
> in signature generation path. So, separate the length checking of octet string
> because it's not for generate 0x00 0x01 leading string when used in signature
> generation.
> 
> Reviewed-by: Jiri Kosina <jkosina@suse.cz>
> Signed-off-by: Lee, Chun-Yi <jlee@suse.com>

> +static int RSA_I2OSP(MPI x, size_t xLen, u8 **_X)
> +{
> +	unsigned x_size;
> +	unsigned X_size;
> +	u8 *X = NULL;

Is this kernel code or entry into obfuscated C code contest? This is not funny.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html