linux-kernel - Re: [PATCH 16/20] PKCS#7: Add an optional authenticated attribute to hold firmware name [ver #5]

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Message-ID: <16916.1433173823@warthog.procyon.org.uk>
Date:	Mon, 01 Jun 2015 16:50:23 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	dhowells@...hat.com, Andy Lutomirski <luto@...nel.org>,
	Luis Rodriguez <mcgrof@...e.com>,
	Matthew Garrett <mjg59@...f.ucam.org>, keyrings@...ux-nfs.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kyle McMartin <kyle@...nel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	LSM List <linux-security-module@...r.kernel.org>,
	Mimi Zohar <zohar@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 16/20] PKCS#7: Add an optional authenticated attribute to hold firmware name [ver #5]

Andy Lutomirski <luto@...capital.net> wrote:

> > You can also fudge the signature (or a hash) by adding extra data to or
> > modifying the data blob and by switching signature values between signature
> > blobs.
> 
> So there's another design error in PKCS#7?  Great!

No.  This applies to *all* signatures where you're signing a hash.

David
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