Has anyone ever looked into adding labeling support for the cgroup file system

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In order to allow processes to modify the cgroup hierarchy in a
container from an SELinux point of view, we need to allow read/write
access to cgroup_t, which means that a container process could break out
and modify all cgroups, we want to allow them to only modify the portion
of the hierarchy handed to them.

Would be a nice security improvement for docker.

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