Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Fri, 5 Apr 2013 13:01:04 -0700
From: Yinghai Lu <>
To: "H. Peter Anvin" <>
Cc: Kees Cook <>, 
	Linux Kernel Mailing List <>,, 
	Thomas Gleixner <>, Ingo Molnar <>, 
	"the arch/x86 maintainers" <>, Jarkko Sakkinen <>, 
	Matthew Garrett <>, Matt Fleming <>, 
	Eric Northup <>, Dan Rosenberg <>, 
	Julien Tinnes <>, Will Drewry <>
Subject: Re: [PATCH 3/3] x86: kernel base offset ASLR

On Thu, Apr 4, 2013 at 1:21 PM, H. Peter Anvin <> wrote:
> I have to admit to being somewhat skeptical toward KASLR with only 8
> bits of randomness.  There are at least two potential ways of
> dramatically increasing the available randomness:
> 1. actually compose the kernel of multiple independently relocatable
>    pieces (maybe chunk it on 2M boundaries or something.)
> 2. compile the kernel as one of the memory models which can be executed
>    anywhere in the 64-bit address space.  The cost of this would have
>    to be quantified, of course.

Why just let bootloader to load kernel on random address instead?

For our 64bit bzImage, boot loader could load kernel to anywhere above 4G.



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