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

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Message-ID: <CAE9FiQU97FHKpKQjZJq+Nfz18eM2n0-V2n4B6m=ozjkycP+Rng@mail.gmail.com>
Date:	Mon, 15 Apr 2013 19:56:21 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Eric Northup <digitaleric@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<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>,
	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 Mon, Apr 15, 2013 at 7:36 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/15/2013 03:00 PM, Yinghai Lu wrote:
>>
>> looks you are trying redo the work for bootloader to pick loaded phys addr.
>>
>
> Well, that is exactly what they are doing.  On top of that they also
> need to randomize the 64-bit virtual mapping.
>
> I wonder if we need a bootloader bit to inhibit kaslr in addition to the
> command line...

so let the bootloader to parse kaslr and pick ramdom address,
and kernel arch/x86/boot/compressed/head_64.S to pick random virtual address?

Yinghai
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