The kernel lockdown feature further restricts access to the kernel by user-space with what can be accessed or modified, including different /dev points, ACPI restrictions, not allowing unsigned modules, and various other restrictions in the name of greater security. Pairing that with UEFI SecureBoot unconditionally is meeting some resistance by Linus Torvalds.

This thread is what has Linus Torvalds fired up today.

Phoronix

Linus has been working really hard to make Linux is secure.