linux-kernel - Re: [PATCH 6/6] x86: kaslr: relocate base offset at boot

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Date:	Sat, 13 Apr 2013 20:06:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel-hardening@...ts.openwall.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <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>
Subject: Re: [PATCH 6/6] x86: kaslr: relocate base offset at boot

On 04/13/2013 05:37 PM, Yinghai Lu wrote:
> 
> so decompress code position is changed?
> 
> You may push out bss and other data area of run-time kernel of limit
> that boot loader
> chose according to setup_header.init_size.
> aka that make those area overlap with ram hole or other area like
> boot command line or initrd....
> 

Is there a strong reason to randomize the physical address on 64 bits
(and if so, shouldn't we do it right?)

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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