linux-kernel - Re: [PATCH] Add error check to hex2bin().

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Message-ID: <1311026365.3648.110.camel@localhost.localdomain>
Date:	Mon, 18 Jul 2011 17:59:25 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	linux-security-module@...r.kernel.org,
	andriy.shevchenko@...ux.intel.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add error check to hex2bin().

On Tue, 2011-07-19 at 00:18 +0300, Andy Shevchenko wrote:
> On Mon, Jul 18, 2011 at 11:49 PM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> > What about making it return the number of unprocessed bytes left instead?
> > Then the caller knows where the problem lies. And zero would mean success.
> If I remember correctly it used to be src as return value in some
> version of that patch. I don't know the details of that interim
> solution. My current opinion is to return boolean and make an
> additional parameter to return src value. However, it could make this
> simple function fat.
> P.S. Take into account that the user of it is only one so far, I would
> like to hear a Mimi's opinion.

Trusted/encrypted keys are not in a critical code path. They're used for
loading/storing key blobs from userspace. Once you change the API, short
circuiting out and adding an error return, from a trusted/encrypted key
perspective, it doesn't make a difference.

thanks,

Mimi

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