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

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Message-ID: <560DB4A6.6050107@sr71.net>
Date:	Thu, 1 Oct 2015 15:33:10 -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:
>> 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. :)

Here it is in a quite fugly form (well, it's not opt-in).  Init crashes
if I boot with this, though.

I'll see if I can turn it in to a bit more of an opt-in and see what's
actually going wrong.



View attachment "pkeys-95-rewire-mprotect-to-use-pkeys.patch" of type "text/x-patch" (8256 bytes)