On Tue, Jun 27, 2017 at 02:30:28PM -0400, Tejun Heo wrote: > Currently, cgroup only supports delegation to !root users and cgroup > namespaces don't get any special treatments. This limits the > usefulness of cgroup namespaces as they by themselves can't be safe > delegation boundaries. A process inside a cgroup can change the > resource control knobs of the parent in the namespace root and may > move processes in and out of the namespace if cgroups outside its > namespace are visible somehow. > > This patch adds a new mount option "nsdelegate" which makes cgroup > namespaces delegation boundaries. If set, cgroup behaves as if write > permission based delegation took place at namespace boundaries - > writes to the resource control knobs from the namespace root are > denied and migration crossing the namespace boundary aren't allowed > from inside the namespace. > > This allows cgroup namespace to function as a delegation boundary by > itself. > > v2: Silently ignore nsdelegate specified on !init mounts. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Cc: Aravind Anbudurai <aru7@xxxxxx> > Cc: Serge Hallyn <serge@xxxxxxxxxx> > Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx> Applying 2-3 to cgroup/for-4.13. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
