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

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Message-ID: <4DE19DC3.7090106@zytor.com>
Date:	Sat, 28 May 2011 18:13:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dan Rosenberg <drosenberg@...curity.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tony Luck <tony.luck@...il.com>,
	linux-kernel@...r.kernel.org, davej@...hat.com,
	kees.cook@...onical.com, davem@...emloft.net, eranian@...gle.com,
	adobriyan@...il.com, penberg@...nel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, pageexec@...email.hu
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot

On 05/28/2011 05:18 AM, Ingo Molnar wrote:
> 
> Having half a megabyte of '__init buffer' at the beginning or end of 
> the kernel image is no big deal, it's more than enough for good 
> randomization and makes the whole thing image-loader invariant: we 
> can freely shift the 'real' kernel image within this larger boundary 
> without consulting RAM maps.
> 

Sure, but you're also blowing any attempt at PMD alignment to kingdom come.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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