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

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Message-ID: <1306278082.1921.6.camel@dan>
Date:	Tue, 24 May 2011 19:01:22 -0400
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	Brian Gerst <brgerst@...il.com>
Cc:	Tony Luck <tony.luck@...il.com>, linux-kernel@...r.kernel.org,
	davej@...hat.com, kees.cook@...onical.com, davem@...emloft.net,
	eranian@...gle.com, torvalds@...ux-foundation.org,
	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, Ingo Molnar <mingo@...e.hu>,
	pageexec@...email.hu
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot


> 
> This trick doesn't work as you may expect on 64-bit.  You are
> relocating the physical image of the kernel, but the kernel actually
> runs from a fixed virtual mapping.  This would require adding the
> relocation code that 32-bit uses, so the virtual address can be
> changed.
> 

Noted, thanks, I'll be sure to not waste my time when I start working on
64-bit.

-Dan

> --
> Brian Gerst


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