From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kees Cook <keescook@chromium.org>
Date: Tue, 24 Jul 2018 17:53:26 +0000
Subject: Re: [PATCH v6 18/18] crypto: Remove AHASH_REQUEST_ON_STACK
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 <1bdc706ae86039c4ffcff39698251424d54af116.camel@perches.com>
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To: Joe Perches <joe@perches.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>, Arnd Bergmann <arnd@arndb.de>, Eric Biggers <ebiggers@google.com>, "Gustavo A. R. Silva" <gustavo@embeddedor.com>, Alasdair Kergon <agk@redhat.com>, Rabin Vincent <rabinv@axis.com>, Tim Chen <tim.c.chen@linux.intel.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>, Philipp Reisner <philipp.reisner@linbit.com>, Lars Ellenberg <lars.ellenberg@linbit.com>, Jens Axboe <axboe@kernel.dk>, Giovanni Cabiddu <giovanni.cabiddu@intel.com>, Mike Snitzer <snitzer@redhat.com>, Paul Mackerras <paulus@samba.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, David Howells <dhowells@redhat.com>, Johannes Berg <johannes@sipsolutions.net>, Tudor-Dan Ambarus <tudor.ambarus@microchip.com>, Jia-Ju Bai <baijiaju1990@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Geert Uytterhoeven <geert@linux-m68k.org>, Josh Poimboeuf <jpoimboe@redhat.com>, David Woodhouse <dwmw@amazon.co.uk>, Will Deacon <will.deacon@arm.com>, device-mapper development <dm-devel@redhat.com>, Linux PM list <linux-pm@vger.kernel.org>, linux-crypto <linux-crypto@vger.kernel.org>, drbd-dev@lists.linbit.com, linux-block <linux-block@vger.kernel.org>, qat-linux@intel.com, linux-ppp@vger.kernel.org, Network Development <netdev@vger.kernel.org>, "open list:ANDROID DRIVERS" <devel@driverdev.osuosl.org>, linux-afs@lists.infradead.org, linux-wireless <linux-wireless@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>

On Tue, Jul 24, 2018 at 10:31 AM, Joe Perches <joe@perches.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