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

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Date:	Thu, 28 Feb 2013 20:31:36 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	Chris Friesen <chris.friesen@...band.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 Thu, Feb 28, 2013 at 09:23:45PM +0100, Florian Weimer wrote:
> * Matthew Garrett:
> > grub's running before ExitBootServices(), because otherwise it has no 
> > way to actually read anything off disk. Or draw to the screen.
> 
> Sorry, if Linux can read from the disk after ExitBootServices(), so
> can a boot loader.  Actually, we could boot Linux directly, with an
> initrd which contains a boot selector, and use kexec if the chosen
> kernel doesn't match the initial one.

"A bootloader" might be able to. grub can't.

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