audit kernel module namespace security

[reidpr]

We'd like to use XPMEM in environments with user namespaces, and perhaps other namespaces, enabled. A prerequisite for this is for the kernel module to be secure when used from inside namespaces.

For example, the UID used for access checking need to be the real host UID, not the in-namespace UID. But I think there are other things to check too.

I spoke with @jlowellwofford today and he told me he might be able to help with this.

[hjelmn]

New issue URL: https://gitlab.com/hjelmn/xpmem/issues/25