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

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Message-ID: <20130228193023.GA8090@srcf.ucam.org>
Date:	Thu, 28 Feb 2013 19:30:23 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Chris Friesen <chris.friesen@...band.com>
Cc:	Florian Weimer <fw@...eb.enyo.de>,
	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 Thu, Feb 28, 2013 at 09:43:10AM -0600, Chris Friesen wrote:
> On 02/28/2013 01:57 AM, Florian Weimer wrote:
> 
> >In any case, there's another reading of the UEFI Secure Boot
> >requirements: you may run any code you wish after calling
> >ExitBootServices().  That could be an unsigned, traditional GRUB.  But
> >this will not generally address the issue of dual-booting Windows 8 in
> >such a way that Windows sees that the device has enabled Microsoft
> >Secure Boot.
> 
> Would it be possible to have a signed bootloader that allows booting
> Win8 from within the secure environment, or it could exit the secure
> environment and run unsigned grub?

What would stop the unsigned grub from installing a firmware hook that 
lies about whether or not Secure Boot is enabled, and then booting 
Windows?

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