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cgroup: cgroup namespace setns support

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setns on a cgroup namespace is allowed only if
task has CAP_SYS_ADMIN in its current user-namespace and
over the user-namespace associated with target cgroupns.
No implicit cgroup changes happen with attaching to another
cgroupns. It is expected that the somone moves the attaching
process under the target cgroupns-root.

Signed-off-by: Aditya Kali <adityakali@google.com>
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Aditya Kali 2016-01-29 02:54:07 -06:00 committed by Tejun Heo
parent a79a908fd2
commit a0530e087e
1 changed files with 16 additions and 3 deletions
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19
kernel/cgroup.c
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@ -6057,10 +6057,23 @@ static inline struct cgroup_namespace *to_cg_ns(struct ns_common *ns)
return container_of(ns, struct cgroup_namespace, ns);
}
static int cgroupns_install(struct nsproxy *nsproxy, void *ns)
static int cgroupns_install(struct nsproxy *nsproxy, struct ns_common *ns)
{
pr_info("setns not supported for cgroup namespace");
return -EINVAL;
struct cgroup_namespace *cgroup_ns = to_cg_ns(ns);
if (!ns_capable(current_user_ns(), CAP_SYS_ADMIN) ||
!ns_capable(cgroup_ns->user_ns, CAP_SYS_ADMIN))
return -EPERM;
/* Don't need to do anything if we are attaching to our own cgroupns. */
if (cgroup_ns == nsproxy->cgroup_ns)
return 0;
get_cgroup_ns(cgroup_ns);
put_cgroup_ns(nsproxy->cgroup_ns);
nsproxy->cgroup_ns = cgroup_ns;
return 0;
}
static struct ns_common *cgroupns_get(struct task_struct *task)