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Date: Fri, 05 Apr 2013 11:17:37 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Ingo Molnar <mingo@...nel.org>
CC: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org, Jarkko Sakkinen <jarkko.sakkinen@...el.com>,
        Matthew Garrett <mjg@...hat.com>,
        Matt Fleming <matt.fleming@...el.com>,
        Eric Northup <digitaleric@...gle.com>,
        Dan Rosenberg <drosenberg@...curity.com>,
        Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/3] x86: kernel base offset ASLR

On 04/05/2013 01:04 AM, Ingo Molnar wrote:
> 
> The cost of 64-bit RIPs is probably measurable both in cache footprint and 
> in execution speed.
> 

Well, "probably" usually translates to "worth measuring" to me.

> Random runtime shuffling of the kernel image - is that possible with 
> existing toolchains?

I wanted to point out... yes this is hard, but it has the ability to be
*much* stronger than any other form of KASLR simply because it means
that a single infoleak doesn't give everything else away.

	-hpa


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