[PATCH 23/27] bpf: Restrict kernel image access functions when the kernel is locked down

[Matthew Garrett]

On Tue, Mar 26, 2019 at 11:57 AM James Morris <jmorris at namei.org> wrote:
> - Assign an ID to each lockdown point
> - Implement a policy mechanism where each ID is mapped to 0 or 1
> - Allow this policy to be specified statically or dynamically

One of the problems with this approach is what the default behaviour
should be when a new feature is added. If an admin fails to notice
that there's now a new policy element, they run the risk of kernel
integrity being compromised via the new feature even if the rest of
the kernel is locked down.