linux-kernel - Re: [GIT PULL] Load keys from signed PE binaries

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Message-ID: <20130226194609.GB16640@srcf.ucam.org>
Date:	Tue, 26 Feb 2013 19:46:09 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	Theodore Ts'o <tytso@....edu>, Dave Airlie <airlied@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Peter Jones <pjones@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Kees Cook <keescook@...omium.org>, keyrings@...ux-nfs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Load keys from signed PE binaries

On Tue, Feb 26, 2013 at 08:40:53PM +0100, Florian Weimer wrote:
> | No, there's no way to set the legacy boot as the default option.
> 
> <https://plus.google.com/100479847213284361344/posts/QhmBpn5GNE9>
> 
> So non-interactive booting of alternative operating systems is *not*
> supported.  This is way more restrictive than any x86 UEFI device I've
> heard of (even in the face of a potential revocation of the boot
> loader by Microsoft).

It's supported as long as you use Google's bootloader rather than a 
legacy one, but you're still stuck with either a 30-second boot delay or 
hitting ctrl+d and there's no way to install your own keys without 
disassembling the machine and physically disabling the write-protection 
on the firmware. It's certainly more hostile than any UEFI Secure Boot 
system I've found.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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