On Thu, Jun 27, 2019 at 11:14 AM James Morris [off-list ref] wrote:

On Thu, 27 Jun 2019, Matthew Garrett wrote:

quoted

By that metric, on a secure boot system how do we determine that code
running in the firmware environment wasn't compromised before it
launched the initial signed kernel?

Remote attestation tied to a hardware root of trust, before allowing
access to any further resources.

If you use IMA you can get the same guarantees over kexec.