Start CT in a new user namespace: 1:1 user mapping
Now CT starts in a new user namespace. This allows us:
- to remove our capabilities (CAP_VE_*)
- to improve security of our containers, because a process doesn't have privileges outside the container
Here is a good article about user namespaces https://lwn.net/Articles/532593/
Users should not notice these changes, everything should work as before.
Testing[edit]
- need to execute tests to check security of containers
- execute all tests, because these changes are touching very general parts
