linux-kernel - Re: [PATCH 07/11] kexec: Disable in a secure boot environment

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Message-ID: <20120904223957.50f6a3b9@pyramind.ukuu.org.uk>
Date:	Tue, 4 Sep 2012 22:39:57 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH 07/11] kexec: Disable in a secure boot environment

> > Well, given that approximately everyone will be booting under EFI within 
> > 18 months, treating it as a niche case seems a little short sighted.

Actually the majority of Linux devices are not PCs 8)

> > secondly, there are already several non-EFI platforms that want to enact 
> > a policy preventing root from being able to arbitrarily replace the 
> > kernel. Given that people are doing this in the wild, it makes sense to 
> > move towards offering that policy in the mainline kernel.
> 
> Either this code makes sense without an appeal to EFI or this code makes
> no sense.

Yes - and the capability is I think the right starting point (although
you'll never make any OS locked down this way even if you are not in fact
violating the GPLv2 license by doing so, which I suspect will be the case
for some implementations)

> So please rework this to come from an angle that makes sense all by
> itself.

I think it needs to be defined in terms of what the capability is
supposed to guarantee. I have a feeling Matthew has a pretty clear idea
about that in his head so can nail it fairly precisely ?

Alan
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