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Date: Thu, 21 Apr 2016 13:37:03 -0700
From: Kees Cook <keescook@...omium.org>
To: David Windsor <dave@...gbits.org>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC PATCH v2 00/12] Add PAX_REFCOUNT overflow protection

Hi David,

On Thu, Feb 4, 2016 at 10:19 AM, Kees Cook <keescook@...omium.org> wrote:
> On Tue, Feb 2, 2016 at 3:33 AM, David Windsor <dave@...gbits.org> wrote:
>> FYI, I now have time to work on this again.
>>
>> Currently, I'm rebasing v2 atop linux-next.  I've already incorporated
>> the following changes suggested during the on-list review of v2:
>>
>> * s/PAX_REFCOUNT/STRICT_REFCOUNT
>> * Reordering the patchset in a more sane manner (per Greg KH)
>> * Creation of the "Kernel Hardening" menu in Kconfig
>> * Creation of per-architecture Kconfig option for opting in to STRICT_REFCOUNT
>> * Whitespace fixes
>>
>> v3 is forthcoming and will be posted here as soon as I have the
>> patchset rebased to linux-next.
>
> Thanks for the update!
>
> It may be helpful to mention in the changelog the two recent refcount
> overflow bugs that would have been stopped by this mitigiation:
>
> CVE-2014-2851 https://cyseclabs.com/page?n=02012016
> CVE-2016-0728 http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/

Any news on a v3 series? I'd love to see what you've got so far.

Thanks!

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security

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