linux-kernel - Re: [PATCH 3/3] x86: kernel base offset ASLR

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Date:	Mon, 08 Apr 2013 07:58:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	kernel-hardening@...ts.openwall.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, 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>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/3] x86: kernel base offset ASLR

Not if we do it right, but there is a huge potential boot time penalty.

Ingo Molnar <mingo@...nel.org> wrote:

>
>* H. Peter Anvin <hpa@...or.com> wrote:
>
>> On 04/05/2013 01:04 AM, Ingo Molnar wrote:
>> > 
>> > Random runtime shuffling of the kernel image - is that possible
>with 
>> > existing toolchains?
>> > 
>> 
>> Yes... the question is how much work we'd be willing to go through to
>make it 
>> happen.
>> 
>> One approach: the kernel already contains a linker -- used for
>modules -- and 
>> the bulk of the kernel could actually be composed to a "pile of
>modules" that 
>> gets linked on boot.  This would provide very large amounts of
>randomness.
>
>Is there no code generation / micro-performance disadvantage to that?
>
>Thanks,
>
>	Ingo

-- 
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