linux-kernel - Re: [RFC][PATCH] Randomize kernel base address on boot

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Date:	Fri, 27 May 2011 19:16:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tony Luck <tony.luck@...il.com>,
	linux-kernel@...r.kernel.org, davej@...hat.com,
	kees.cook@...onical.com, davem@...emloft.net, eranian@...gle.com,
	adobriyan@...il.com, penberg@...nel.org, hpa@...or.com,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, pageexec@...email.hu
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot


* Dan Rosenberg <drosenberg@...curity.com> wrote:

> Just to play devil's advocate, how is it easier for a local 
> attacker to figure out where kernel internals are if it's been 
> relinked vs. randomized at load time, assuming we follow through on 
> fixing the info leaks?

Well, 'fixing the info leaks' will obfuscate previously useful files 
such as /proc/kallsyms ...

That's one of the advantages of randomization: it allows us to expose 
RIPs without them being an instant information leak.

Thanks,

	Ingo
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