Following #19995 and #17409 this PR enables skipping userns re-mapping
when creating a container (or when executing a command). Thus, enabling
privileged containers running side by side with userns remapped
containers.
The feature is enabled by specifying ```--userns:host```, which will not
remapped the user if userns are applied. If this flag is not specified,
the existing behavior (which blocks specific privileged operation)
remains.
Signed-off-by: Liron Levin <liron@twistlock.com>
Upstream-commit: 6993e891d10c760d22e0ea3d455f13858cd0de46
Component: engine
On redhat based distribution, checking that USER_NS is compiled in the
kernel is not sufficient, we also have to check that the feature as
been enabled.
With this commit, it is now done by checking the content of
`/sys/module/user_namespace/parameters/enable`.
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
Upstream-commit: 6cbff9505c992bd1e61ea7943737dac04ba665ea
Component: engine
