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

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Message-ID: <4DDED4ED.7020806@zytor.com>
Date:	Thu, 26 May 2011 15:32:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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?

	-hpa
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