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Date: Fri, 05 Apr 2013 11:17:37 -0700
From: "H. Peter Anvin" <>
To: Ingo Molnar <>
CC: Kees Cook <>,,,
        Thomas Gleixner <>, Ingo Molnar <>,, Jarkko Sakkinen <>,
        Matthew Garrett <>,
        Matt Fleming <>,
        Eric Northup <>,
        Dan Rosenberg <>,
        Julien Tinnes <>, Will Drewry <>,
        Linus Torvalds <>
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.


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