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Date: Tue, 20 Mar 2018 13:36:55 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Florian Westphal <fw@...len.de>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	Kees Cook <keescook@...omium.org>,
	"Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: Re: [PATCH] netfilter: nfnetlink_cthelper: Remove VLA usage

On Mon, Mar 12, 2018 at 07:21:38PM -0500, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wvla, remove VLA and replace it
> with dynamic memory allocation.
> 
> From a security viewpoint, the use of Variable Length Arrays can be
> a vector for stack overflow attacks. Also, in general, as the code
> evolves it is easy to lose track of how big a VLA can get. Thus, we
> can end up having segfaults that are hard to debug.
> 
> Also, fixed as part of the directive to remove all VLAs from
> the kernel: https://lkml.org/lkml/2018/3/7/621

also applied, thanks.

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