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Date: Tue, 2 Feb 2016 06:33:27 -0500
From: David Windsor <>
To: Kees Cook <>,
Subject: Re: [RFC PATCH v2 00/12] Add PAX_REFCOUNT overflow protection

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:

* 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.


On Wed, Jan 20, 2016 at 8:11 AM, David Windsor <> wrote:
> Hi Kees,
> On Tue, Jan 19, 2016 at 2:07 PM, Kees Cook <> wrote:
>> Hi David,
>> On Thu, Dec 17, 2015 at 12:55 PM, Kees Cook <> wrote:
>>> On Thu, Dec 17, 2015 at 6:57 AM, David Windsor <> wrote:
>>>> NOTE: This is a v2 submission because patch 3/5 in v1 was too large to sent
>>>> to kernel-hardening.  Taking that as a sign that the patch needed to be split,
>>>> I'm sending this version of the patchset, with the patches split more or less
>>>> on a per-maintainer basis (except for those in drivers/).
>> How's the next spin coming? It looks like we have some new real-world
>> examples of exploits that would have been blocked by this protection:
>> :)
> I'm currently working on v3 of this patchset: porting the patches to
> linux-next and incorporating suggested changes to v2.  I'm fairly well
> along, but need just a bit more time  I'm a bit busy at the moment, so
> I expect realistically to have time to finish this at the beginning of
> February.
> Thanks,
> David
>> -Kees
>> --
>> Kees Cook
>> Chrome OS & Brillo Security

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