linux-kernel - Re: [PATCH 26/26] x86, pkeys: Documentation

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Message-ID: <560D9E5C.4090605@sr71.net>
Date:	Thu, 1 Oct 2015 13:58:04 -0700
From:	Dave Hansen <dave@...1.net>
To:	Kees Cook <keescook@...gle.com>, Ingo Molnar <mingo@...nel.org>
Cc:	"x86@...nel.org" <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 26/26] x86, pkeys: Documentation

On 10/01/2015 01:39 PM, Kees Cook wrote:
> On Thu, Oct 1, 2015 at 4:17 AM, Ingo Molnar <mingo@...nel.org> wrote:
>> * Dave Hansen <dave@...1.net> wrote:
>>>> If yes then this could be a significant security feature / usecase for pkeys:
> 
> Which CPUs (will) have pkeys?

It hasn't been announced publicly, so all I can say here is "future ones".

>>>> executable sections of shared libraries and binaries could be mapped with pkey
>>>> access disabled. If I read the Intel documentation correctly then that should
>>>> be possible.
>>>
>>> Agreed.  I've even heard from some researchers who are interested in this:
>>>
>>> https://www.infsec.cs.uni-saarland.de/wp-content/uploads/sites/2/2014/10/nuernberger2014ccs_disclosure.pdf
>>
>> So could we try to add an (opt-in) kernel option that enables this transparently
>> and automatically for all PROT_EXEC && !PROT_WRITE mappings, without any
>> user-space changes and syscalls necessary?
> 
> I would like this very much. :)

I'll go hack something together and see what breaks.

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