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Date: Mon, 13 Nov 2017 08:50:25 -0800
From: Nick Desaulniers <>
To: "Tobin C. Harding" <>
Cc: Kees Cook <>,, 
	Josh Poimboeuf <>
Subject: Re: [RFC] vla: add VLA macro and testing

Variable Length Array In Struct, a GNU C extension.

Think of a variable length array, as a member of a struct, but not as
the final member.

On Sun, Nov 12, 2017 at 3:54 PM, Tobin C. Harding <> wrote:
> On Wed, Nov 08, 2017 at 03:04:25PM -0800, Nick Desaulniers wrote:
>> On Wed, Nov 8, 2017 at 2:58 PM, Kees Cook <> wrote:
>> > While I'd certainly like to see SOME kind of sanity checking for VLAs,
>> > my preference would be to entirely eliminate them at get -Werror=vla
>> > added to the Makefile. Even Linus has expressed irritation over the
>> > idea of VLAs in structs in the past:
>> >
>> >
>> VLAIS makes it difficult (impossible) to compile allyesconfig with
>> clang.  VLA on the stack is fine, but VLAIS is not.
> What is VLAIS please? I don't get any results when grepping the kernel
> tree.
> $ git grep VLAIS
> thanks,
> Tobin.

~Nick Desaulniers

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