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

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Message-ID: <CAGXu5jK5WT7u18Tee6XtwxMLTaWbV2PiNA4opWTox+DB5BT7gQ@mail.gmail.com>
Date:	Thu, 1 Oct 2015 15:35:43 -0700
From:	Kees Cook <keescook@...gle.com>
To:	Dave Hansen <dave@...1.net>
Cc:	Ingo Molnar <mingo@...nel.org>, "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 Thu, Oct 1, 2015 at 3:33 PM, Dave Hansen <dave@...1.net> wrote:
> 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.

*laugh* Okay... well, we've got some work to do, I guess. :)

(And which init?)

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

Cool, thanks!

-Kees

-- 
Kees Cook
Chrome OS Security
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