linux-kernel - Re: [RFC][PATCH] Randomize kernel base address on boot

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Message-Id: <201105271807.21310.rjw@sisk.pl>
Date:	Fri, 27 May 2011 18:07:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	Tony Luck <tony.luck@...il.com>, linux-kernel@...r.kernel.org,
	davej@...hat.com, kees.cook@...onical.com, davem@...emloft.net,
	eranian@...gle.com, torvalds@...ux-foundation.org,
	adobriyan@...il.com, penberg@...nel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, Ingo Molnar <mingo@...e.hu>,
	pageexec@...email.hu
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot

On Friday, May 27, 2011, H. Peter Anvin wrote:
> On 05/26/2011 03:18 PM, Rafael J. Wysocki wrote:
> > 
> > Well, as far as I can tell, this feature is going to break hibernation on
> > both x86_32 and x86_64 at the moment, unless you can guarantee that the
> > randomized kernel location will be the same for both the boot and the target
> > kernels.
> > 
> 
> Obviously we can't and we don't.  I'm a bit surprised at that
> constraint... how can that constraint not break things like kernels of
> slightly different size?

Our hibernation code generally requires that the kernel used for loading
the image be the same as the hibernated one.  This requirement is slightly
lifted for x86_64, but still we don't have a mechanism for passing the
jump address into the hibernated header in the image header.

I planned to add that, but then didn't have the time to work on it.

Thanks,
Rafael
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