linux-kernel - Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address is invalid

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Message-ID: <20111107213623.GA29304@srcf.ucam.org>
Date:	Mon, 7 Nov 2011 21:36:23 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Zhang Rui <rui.zhang@...el.com>,
	Huang Ying <huang.ying.caritas@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address
 is invalid

On Mon, Nov 07, 2011 at 01:34:01PM -0800, H. Peter Anvin wrote:
> On 11/07/2011 01:23 PM, Matthew Garrett wrote:
> > 
> > I know. But we also have to handle being called after 
> > ExitBootServices(). There are going to be people who don't want to deal 
> > with signing their kernel builds.
> >  
> 
> Could you clarify why these two are connected?

You can't execute anything unsigned until after ExitBootServices() has 
been called. Otherwise your bootloader is also a malware loader, and 
your signature probably gets blacklisted.

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