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

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Message-ID: <1476690478.19992.4.camel@sipsolutions.net>
Date:   Mon, 17 Oct 2016 09:47:58 +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 08:37 +0100, Ard Biesheuvel wrote:
> 
> Could we get a statement first whether it is supported to allocate
> aead_req (and other crypto req structures) on the stack? 

Well, we haven't heard from Herbert :)

> If not, then
> we have our work cut out for us. But if it is, I'd rather we didn't
> apply the kzalloc/kfree patch, since it is just a workaround for the
> broken generic CCM driver, for which a fix is already available.

Yeah but I can't apply it. I just fixed up your kzalloc patch to also
handle GCM and GMAC, and to have error checking. Will send it in a
minute.

> 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?

johannes