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Message-ID: <n1khkt$lc7$1@ger.gmane.org>
Date: Sat, 7 Nov 2015 09:52:29 +0000 (UTC)
From: Quentin Casasnovas <quentin.casasnovas@...cle.com>
To: kernel-hardening@...ts.openwall.com
Subject: Re: Kernel Self Protection Project
On 2015-11-06, Kees Cook <keescook@...omium.org> wrote:
> On Fri, Nov 6, 2015 at 8:00 AM, Quentin Casasnovas
><quentin.casasnovas@...cle.com> wrote:
>>>
>>> For now, I'm going to focus on taking a look at the PAX_SIZE_OVERFLOW
>>> gcc plugin, which will also get us the gcc plugin infrastructure.
>>> Other people, please speak up on what you'd like to tackle.
>>>
>>
>> Not that it's complex but I already have a branch with the gcc plugin
>> infrastructure split up if you're interested and you reckon that can save
>> you some time.
>
> Sure, what's the URL?
>
I've pushed the three of them onto:
https://github.com/casasnovas/linux/commits/quentin-spk-gcc-plugin
It lacks Documentation for now, but you can have a look at the branch
quentin-fuzz-gccplugin which adds an instrumentation plugin (converted from
the gcc patch[1] Dmitry Vyukov wrote for syzkaller[2]).
Adding a plugin should be simple, add its name to $(HOSTLIBS)-y, and use
the regular kbuild system way to specify from which source files it is
built, CFLAGS, etc.
$(HOSTLIBS)-y = foo.so
foo-objs = foo.c bar.c
And then to have some compilations units be compiled using foo.so, they
just need the following in their CFLAGS:
-fplugin=$(objtree)/path/to/foo.so
[1] https://codereview.appspot.com/267910043
[2] https://github.com/google/syzkaller
All of this is taken from the grsecurity/PaX Team patchset.
>
> I actually think that just splitting out features might be a good
> first step all around. Most folks aren't very familiar with the
> PaX/Grsec patches, and they, in their monolithic nature, can be hard
> to understand. Many depend on each other, but some are separable.
>
Agreed, that should be a required step before people can review.
> I'm also hoping Emese Revfy[1] might be interested in driving
> PAX_SIZE_OVERFLOW too, which would be terrific, since she's way more
> qualified than me to do it. /me awaits emails. :)
>
> -Kees
>
> [1] https://github.com/ephox-gcc-plugins/size_overflow
>
Quentin
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