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

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Message-ID: <CAGXu5jLAbSBH4Twnx5mADMy5Y_TugHhZ2anprpE1PUZ1nt5Caw@mail.gmail.com>
Date:	Tue, 16 Apr 2013 09:08:56 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Eric Northup <digitaleric@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	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 7:40 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/15/2013 07:31 PM, H. Peter Anvin wrote:
>>
>> I also am starting to think that this really would be done better being
>> integrated with the decompressor code, since that code already ends up
>> moving the code around... no reason to do this again.
>>
>
> Another good reason to do this in the decompressor wrapper: it can be
> written in C that way.

This would make the code much more readable, for sure. And given that
the 64-bit relocation work happens after decompression, this seems
only right. Good idea! I'll start working on it.

-Kees

--
Kees Cook
Chrome OS Security
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