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

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Message-ID: <878v6c79av.fsf@mid.deneb.enyo.de>
Date:	Mon, 25 Feb 2013 15:33:12 +0100
From:	Florian Weimer <fw@...eb.enyo.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
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

* 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?
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