linux-kernel - Re: HMAC broken on s390

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Message-ID: <20071204082511.GC23294@kernel.dk>
Date:	Tue, 4 Dec 2007 09:25:11 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Jan Glauber <jang@...ux.vnet.ibm.com>,
	linux-crypto <linux-crypto@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: HMAC broken on s390

On Tue, Dec 04 2007, Herbert Xu wrote:
> On Mon, Dec 03, 2007 at 02:31:40PM +0100, Jan Glauber wrote:
> > Hi Herbert,
> > 
> > commit 788fefa33b0b50581585925c53c230a36af35d0e in cryptodev breaks hmac
> > on s390 du to the usage of sg_chain():
> > 
> > static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
> >                             struct scatterlist *sgl)
> > {
> > #ifndef ARCH_HAS_SG_CHAIN
> >         BUG();
> > #endif
> > 
> > ARCH_HAS_SG_CHAIN is false for s390 (and also for some other arch's).
> > 
> > What should we do with this?
> 
> Looks like we took a step backwards because the chaining I had
> before worked on all architectures :)
> 
> I suppose either we'll have to do our own chaining again or implement
> it for all architectures.  I'll look into this.

You should continue to do your own chaining if it's a requirement for
the driver/layer to function, until we get rid of ARCH_HAS_SG_CHAIN.
That'll happen when all archs are converted.

So don't rely on scatterlist helping you with chaining just yet, sorry.

-- 
Jens Axboe

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