linux-kernel - Re: [PATCH] crypto: ccm - avoid scatterlist for MAC encryption

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Message-ID: <1476691059.19992.6.camel@sipsolutions.net>
Date:   Mon, 17 Oct 2016 09:57:39 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "<linux-wireless@...r.kernel.org>" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jouni Malinen <j@...fi>
Subject: Re: [PATCH] crypto: ccm - avoid scatterlist for MAC encryption

On Mon, 2016-10-17 at 08:50 +0100, Ard Biesheuvel wrote:

> I just realised that patch should probably use
> aead_request_alloc/aead_request_free [and drop the memset]. That also
> fixes the latent bug where the alignment of the req ctx is not take
> into account.

Good point, I'll fix that up.

> > 
> > > 
> > > Also, regarding your __percpu patch: those are located in the
> > > vmalloc
> > > area as well, at least on arm64, and likely other architectures
> > > too.
> > 
> > Crap. Any other bright ideas?
> > 
> 
> kmem_cache_create() and kmem_cache_alloc()

for the aad/b0/j0/etc? Hmm. Yeah I guess we should do those dynamically
as well then.

johannes