netdev - Re: [PATCH v6 17/18] crypto: ccm: Remove VLA usage

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Message-ID: <CAGXu5j+-AwHdGZ7Be854WyEQoK2p57JPuTgSXcFq7GOzUtJGEA@mail.gmail.com>
Date:   Tue, 24 Jul 2018 10:51:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Eric Biggers <ebiggers@...gle.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Alasdair Kergon <agk@...hat.com>,
        Rabin Vincent <rabinv@...s.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Jens Axboe <axboe@...nel.dk>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Howells <dhowells@...hat.com>,
        Johannes Berg <johannes@...solutions.net>,
        Tudor-Dan Ambarus <tudor.ambarus@...rochip.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Will Deacon <will.deacon@....com>,
        device-mapper development <dm-devel@...hat.com>,
        linux-pm <linux-pm@...r.kernel.org>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, drbd-dev@...ts.linbit.com,
        linux-block <linux-block@...r.kernel.org>, qat-linux@...el.com,
        linux-ppp@...r.kernel.org,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        linux-afs@...ts.infradead.org,
        "<linux-wireless@...r.kernel.org>" <linux-wireless@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 17/18] crypto: ccm: Remove VLA usage

On Tue, Jul 24, 2018 at 9:57 AM, Ard Biesheuvel
<ard.biesheuvel@...aro.org> wrote:
> On 24 July 2018 at 18:49, Kees Cook <keescook@...omium.org> wrote:
>> From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>>
>> In the quest to remove all stack VLA usage from the kernel[1], this
>> drops AHASH_REQUEST_ON_STACK by preallocated the ahash request area
>> with the skcipher area (which are not used at the same time).
>>
>
> -EGRAMMAR

Whoops. Will fix my poor sentence merging. :)

-Kees

-- 
Kees Cook
Pixel Security