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

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Message-ID: <4DDC3A1A.6030006@zytor.com>
Date:	Tue, 24 May 2011 16:07:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dan Rosenberg <drosenberg@...curity.com>
CC:	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 05/24/2011 04:04 PM, Dan Rosenberg wrote:
> 
>> 2. Not introduce a performance regression (we avoid locating in the
>>    bottom 16 MiB for performance reasons, except on very small systems);
> 
> I altered the boot code so that it uses CONFIG_PHYSICAL_START, which
> defaults to 16 MiB, as a lower bound on location.  So nothing will ever
> get loaded below there, and I still can take advantage of higher
> alignment granularity.  Are there other problems I'm not anticipating?
> 

Please look at the discussion as to what led us to do things this way.

	-hpa
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