linux-kernel - Re: [PATCH v4 13/14] rxrpc: Prepare to remove VLA usage for SKCIPHER_REQUEST_ON

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Message-ID: <CAGXu5j+ckXWYmPodbp5WW91HayRF8E4-DGk1fVsXmL8k0BmefA@mail.gmail.com>
Date:   Thu, 12 Jul 2018 14:38:37 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Alasdair Kergon <agk@...hat.com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Lars Persson <larper@...s.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Rabin Vincent <rabinv@...s.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, qat-linux@...el.com,
        dm-devel@...hat.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v4 13/14] rxrpc: Prepare to remove VLA usage for SKCIPHER_REQUEST_ON_STACK

On Thu, Jul 12, 2018 at 2:15 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Thu, Jul 12, 2018 at 10:30 PM, Kees Cook <keescook@...omium.org> wrote:
>> Actually, I think this can actually be adjusted to just re-use the
>> stack allocation, since rxkad_verify_packet() finishes one before
>> doing another in rxkad_verify_packet_1():
>
> That looks very nice, yes. The same thing is needed in
> rxkad_secure_packet(), right?

Yup. 4 leaf functions and the 2 callers.

-Kees

-- 
Kees Cook
Pixel Security