Re: Suggestion: Use a unified kernel image by default in the future.

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On Tue, Jun 28, 2022 at 01:12:25PM +0200, Petr Pisar wrote:
> On Tue, Jun 28, 2022 at 9:27 AM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
> > That's thinking about the problem from the wrong point of view. SecureBoot
> > doesn't prevent an attacker from booting an OS that's different from what
> > you installed, even without shim they could swap to a different Windows
> > install. What SecureBoot does is to provide a mechanism to assert that
> > what has booted matches the original install, and securely tie that
> > condition to the release of secrets for example to LUKS key.
> >
> I think you mistaken SecureBoot with a TPM measurement.
> 
> SecureBoot is indeed only about executing or not executing a code
> which is signed by a trusted key. Naturally if there are multiple
> trusted keys or a whole tree of signed firmwares, loaders, and
> operating systems, then from SecureBoot point of view, they are
> equivalent.

Well actually I was really referring to the combination of the
two. SecureBoot makes the use of TPM more practical / straightforward
by avoiding the need to tie the policy to measurements that change
on every software update, instead you can tie to a measurement
associated with successful secure boot.

With regards,
Daniel
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