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

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Message-ID: <20130225154236.GC13605@srcf.ucam.org>
Date:	Mon, 25 Feb 2013 15:42:36 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	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 Mon, Feb 25, 2013 at 03:33:12PM +0100, Florian Weimer wrote:
> * Matthew Garrett:
> 
> > I don't think that's a problem. Just put the original binary hash in the 
> > certificate before signing it, and extend the X.509 parser to refuse 
> > certificates that have a tag that's present in dbx.
> 
> Why would Microsoft put a hash of something into dbx which they
> haven't signed?  Wouldn't this make them subject to a
> denial-of-service attack on their platform if they revoke something
> with surprising consequences?

? The entire point is that the key is in a binary that Microsoft have 
signed.

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