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

Mimi Zohar
2014-06-11T01:25:03Z

On Tue, 2014-06-10 at 22:40 +0100, Matthew Garrett wrote:
> On Wed, Jun 11, 2014 at 12:34:28AM +0300, Dmitry Kasatkin wrote:
>
> > My statement is still valid. It is a hole...
> >
> > To prevent the hole it should be explained that one might follow
> > certain instructions
> > to take ownership of your PC. Generate your own keys and remove MS and
> > Vendor ones...
>
> 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.

Mimi