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

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Message-ID: <20110531202712.GB28731@elte.hu>
Date:	Tue, 31 May 2011 22:27:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	Matthew Garrett <mjg@...hat.com>,
	Tony Luck <tony.luck@...il.com>, linux-kernel@...r.kernel.org,
	kees.cook@...onical.com, davej@...hat.com,
	torvalds@...ux-foundation.org, adobriyan@...il.com,
	eranian@...gle.com, penberg@...nel.org, davem@...emloft.net,
	Arjan van de Ven <arjan@...radead.org>,
	Valdis.Kletnieks@...edu, Andrew Morton <akpm@...ux-foundation.org>,
	pageexec@...email.hu, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot


* H. Peter Anvin <hpa@...or.com> wrote:

> On 05/31/2011 12:55 PM, Ingo Molnar wrote:
> > 
> > So ... could you *please* not shelf this idea just because people 
> > used lkml for what it was invented: argued with each other rather 
> > forcefully? :-)
> 
> The real issue is that if it can be (semi)trivially bypassed, then 
> there may not be much reason to do it.

Sure.

> Other than that, Ingo's idea at least have the merit that it would 
> break only older bootloaders doing things wrong.

I'm wondering, why would it break older bootloaders? It's just a 
slightly larger than usual kernel image, nothing is visible to the 
bootloader.

Thanks,

	Ingo
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