From: Pablo Neira Ayuso <pablo@netfilter.org>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
Florian Westphal <fw@strlen.de>,
"David S. Miller" <davem@davemloft.net>,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
Kees Cook <keescook@chromium.org>,
"Gustavo A. R. Silva" <garsilva@embeddedor.com>
Subject: Re: [PATCH] netfilter: nfnetlink_cthelper: Remove VLA usage
Date: Tue, 20 Mar 2018 13:36:55 +0100 [thread overview]
Message-ID: <20180320123655.kugtpftt7nhzvqc5@salvia> (raw)
In-Reply-To: <20180313002138.GA27280@embeddedgus>
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.
next prev parent reply other threads:[~2018-03-20 12:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-13 0:21 [PATCH] netfilter: nfnetlink_cthelper: Remove VLA usage Gustavo A. R. Silva
2018-03-20 12:36 ` Pablo Neira Ayuso [this message]
2018-03-21 13:51 ` Gustavo A. R. Silva
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