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Message-ID: <20180312054450.GF8631@eros>
Date: Mon, 12 Mar 2018 16:44:50 +1100
From: "Tobin C. Harding" <tobin@...orbit.com>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Kees Cook <keescook@...omium.org>, Tycho Andersen <tycho@...ho.ws>,
kernel-hardening@...ts.openwall.com
Subject: Re: VLA commit log
On Mon, Mar 12, 2018 at 12:38:04AM -0500, Gustavo A. R. Silva wrote:
>
>
> On 03/12/2018 12:26 AM, Tobin C. Harding wrote:
> >Hi,
> >
> >I got some push back on the commit log we have all started to use
> >(copying Kees' initial commit log). If we are going to do hundreds of
> >these patches should we write a perfectly correct commit log that can be
> >included as the start of the 'why' of each VLA removal patch? Here is
> >my attempt, I am quite bad at writing commit logs so would love someone
> >to fix it up.
> >
>
> The same thing happened to me once and then I wrote this:
I had a feeling this had happened to you but I couldn't find the patch
that made me think that when writing this.
> In preparation to enabling -Wvla, remove VLA and replace it
> with a fixed-length array instead.
---
> 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
---
Cool, I like this (between ---). Kees can you ack this since I'm going
to cut and paste it about 300 times :)
> The maintainer lived happily ever after. :)
lol
> --
> Gustavo
thanks,
Tobin.
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