linux-kernel - Re: [PATCH v6 18/18] crypto: Remove AHASH_REQUEST_ON

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Message-ID: <CAGXu5j+gTpZFkXE8XSNgYPEpBT4+hCb1kzv8s8KrSTerHyKp6w@mail.gmail.com>
Date:   Tue, 24 Jul 2018 10:53:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joe Perches <joe@...ches.com>
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>, X86 ML <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 list <linux-pm@...r.kernel.org>,
        linux-crypto <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,
        Network Development <netdev@...r.kernel.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        linux-afs@...ts.infradead.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 18/18] crypto: Remove AHASH_REQUEST_ON_STACK

On Tue, Jul 24, 2018 at 10:31 AM, Joe Perches <joe@...ches.com> wrote:
> On Tue, 2018-07-24 at 09:49 -0700, Kees Cook wrote:
>> All users of AHASH_REQUEST_ON_STACK have been removed from the kernel, so
>> drop it entirely so no VLAs get reintroduced by future users.
>
> checkpatch has a test for that.
> It could now be removed as well.
> ---
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 34e4683de7a3..a3517334d661 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -796,7 +796,7 @@ our $declaration_macros = qr{(?x:
>         (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
>         (?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
>         (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(|
> -       (?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(
> +       (?:SKCIPHER_REQUEST|SHASH_DESC)_ON_STACK\s*\(
>  )};

Ah! Cool. I've added this now.

-Kees

-- 
Kees Cook
Pixel Security