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

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Date:	Fri, 27 May 2011 15:38:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	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, pageexec@...email.hu,
	Eric Paris <eparis@...hat.com>
Subject: Re: [RFC][PATCH] Randomize kernel base address on boot


* Vivek Goyal <vgoyal@...hat.com> wrote:

> On Fri, May 27, 2011 at 11:38:53AM +0200, Ingo Molnar wrote:
> > 
> > * Vivek Goyal <vgoyal@...hat.com> wrote:
> > 
> > > > Is it common to run kexec-tools as non-root?  It may be necessary 
> > > > to restrict this interface to root when randomization is used 
> > > > (keep in mind nobody's going to force you to turn this on by 
> > > > default, at least for the foreseeable future).
> > > 
> > > kexec-tools runs as root. And I see that /proc/iomem permissions 
> > > are also for root only. So it probably is a non-issue.
> > 
> > it might be an issue to keep in mind for later projects that try to 
> > lock down root itself from being able to patch the kernel (other than 
> > rebooting the box), using signed modules, disabled direct-ioport 
> > access, and other hardened facilities.
> 
> For such environments, Eric Paris had posted a patch to be able to 
> disable loading of kexec/kdump kernel, similar to disabling module 
> loading.
> 
>    https://lkml.org/lkml/2011/1/19/412
> 
> I don't see that in Linus's tree. So looks like it never got 
> committed.

That patch looks sane enough. Ping akpm about it please?

Thanks,

	Ingo
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