linux-kernel - Re: [PATCH] exofs: Avoid VLA in structures

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Message-Id: <20180327151053.c7c8df4135a5dc0bacea0a83@linux-foundation.org>
Date:   Tue, 27 Mar 2018 15:10:53 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Boaz Harrosh <ooo@...ctrozaur.com>, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] exofs: Avoid VLA in structures

On Tue, 27 Mar 2018 13:39:04 -0700 Kees Cook <keescook@...omium.org> wrote:

> On the quest to remove all VLAs from the kernel[1] this adjusts several
> cases where allocation is made after an array of structures that points
> back into the allocation. The allocations are changed to perform explicit
> calculations instead of using a Variable Length Array in a structure.
> Additionally, this lets Clang compile this code now, since Clang does not
> support VLAIS[2].
> 
> [1] https://lkml.org/lkml/2018/3/7/621
> [2] https://lkml.org/lkml/2013/9/23/500
> 
> ...
>
> I not sure the best way to test this. Kconfig implies I need special hardware?

Yeah, I was wondering about that.  It's a tricky-looking patch.

Boaz, are you able to give it a spin?

Thanks.