linux-kernel - Re: [GIT PULL] x86/kaslr for v3.14

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Message-ID: <20140123093921.GA1998@amd.pavel.ucw.cz>
Date:	Thu, 23 Jan 2014 10:39:21 +0100
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Cong Ding <dinggnu@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, Ingo Molnar <mingo@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14

On Mon 2014-01-20 14:54:12, Linus Torvalds wrote:
> So I pulled this, but one question:
> 
> On Mon, Jan 20, 2014 at 8:47 AM, H. Peter Anvin <hpa@...or.com> wrote:
> > +config RANDOMIZE_BASE
> > +       bool "Randomize the address of the kernel image"
> > +       depends on RELOCATABLE
> > +       depends on !HIBERNATION
> 
> How fundamental is that "!HIBERNATION" issue? Right now that
> anti-dependency on hibernation support will mean that no distro kernel
> will actually use the kernel address space randomization. Which
> long-term is a problem.

Hibernation does some interesting tricks, and it did depend on image
layout staying same.

Rafael did some great work on x86-64 to enable resuming different
kernel version, so this should no longer be a problem (on
x86-64). Just test it, failure will not be subtle.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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