[PATCH v2 0/5] LSM: LoadPin for kernel file loading restrictions

[Kees Cook]

This provides the mini-LSM "loadpin" that intercepts the now consolidated
kernel_file_read LSM hook so that a system can keep all loads coming from
a single trusted filesystem. This is what Chrome OS uses to pin kernel
module and firmware loading to the read-only crypto-verified dm-verity
partition so that kernel module signing is not needed.

-Kees

v2:
- break out utility helpers into separate functions
- have Yama use new helpers too