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: <CALCETrX0kSAW4FvYKmZK8pVzi5XTJs3RtQxqYbyC_KTHeDhMjA@mail.gmail.com>
Date:	Mon, 1 Jun 2015 10:06:49 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	David Howells <dhowells@...hat.com>
Cc:	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]

On Mon, Jun 1, 2015 at 8:50 AM, David Howells <dhowells@...hat.com> wrote:
> 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.

What kind of fudging are you talking about here?  I don't see what
not-intentionally-signed message can be generically fudged to look
like it's signed.

--Andy
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