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

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Message-ID: <4DDC3BC3.4010804@zytor.com>
Date:	Tue, 24 May 2011 16:14:11 -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 03:31 PM, H. Peter Anvin wrote:
> 
> Arguably this is really something that would be *much* better done in
> the bootloader, but given that the dominant boot loader for Linux is
> Grub, I don't expect that anything will ever happen until the cows come
> home :(
> 

This pretty much means we need an opt-out for this.  I think we need
this both in the form of a boot protocol flag bit (for the case where
the boot loader knows what it's doing, and what the kernel to stay put;
perhaps it has already randomized) and a kernel command-line option
(which can be parsed early and set the above flag.)

	-hpa
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