Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys only

Matthew Garrett
2014-06-11T02:22:35Z

On Tue, Jun 10, 2014 at 09:24:53PM -0400, Mimi Zohar wrote:
> On Tue, 2014-06-10 at 22:40 +0100, Matthew Garrett wrote:
> > The hole is that the system trusts keys that you don't trust. The
> > appropriate thing to do is to remove that trust from the entire system,
> > not just one layer of the system. If people gain the impression that
> > they can simply pass a kernel parameter and avoid trusting the vendor
> > keys, they'll be upset to discover that it's easily circumvented.
>
> Assuming I remove all the keys I don't trust, there are still keys that
> are trusted while booting, but are not necessary afterwards. We should
> be able to limit the scope of where and when keys are trusted.

Providing a userspace mechanism for selectively dropping keys from the
kernel seems like a good thing?

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