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Message-ID: <20110629182505.GC14873@openwall.com>
Date: Wed, 29 Jun 2011 22:25:05 +0400
From: Solar Designer <solar@...nwall.com>
To: kernel-hardening@...ts.openwall.com
Subject: Re: overview of PaX features
Vasiliy,
On Sun, Jun 26, 2011 at 10:33:21PM +0400, Vasiliy Kulikov wrote:
> PaXTeam said there is almost nothing I can do with userspace NX.
> Currently it is implemented as a "stack can be X unless GNU_STACK is
> enabled" instead of secure by default policy. It's impossible to fix it
> not breaking the compatibility with old apps. So, I'm skipping NOEXEC
> options.
Please do break compatibility with a handful of old apps - but as a
non-default option (which we're likely to make the default on Owl, just
like we had non-executable stack by default with 2.4.x-ow kernels).
With OpenVZ, it needs to be configurable per-container.
This is an important security hardening feature for us to have, so
please proceed to implement it sooner rather than later.
I'm sorry that I haven't reviewed the rest of your message yet (and am
in fact a bit late with this comment as well...)
Thanks,
Alexander
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