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

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Date:	Sun, 29 May 2011 21:56:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
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


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

> On 05/29/2011 11:44 AM, Ingo Molnar wrote:
> > 
> > We could put a 2MB hole between end of text (end of X) and start of 
> > readonly data (start of NX), and another 2MB hole between end of 
> > readonly and start of data.
> > 
> 
> It still means you have memory which is X-mapped when it doesn't need to
> be, since there will be RAM in that region.

But it ought to be rather harmless in this particular case, because 
the high alias addresses are all randomized!

Thanks,

	Ingo
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