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kernel: add a helper to get an owning user namespace for a namespace

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Return -EPERM if an owning user namespace is outside of a process
current user namespace.

v2: In a first version ns_get_owner returned ENOENT for init_user_ns.
    This special cases was removed from this version. There is nothing
    outside of init_user_ns, so we can return EPERM.
v3: rename ns->get_owner() to ns->owner(). get_* usually means that it
grabs a reference.

Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Andrey Vagin 2016-09-06 00:47:13 -07:00 • committed by Eric W. Biederman
parent 29b4817d40
commit bcac25a58b
9 changed files with 68 additions and 0 deletions
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6
kernel/cgroup.c
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@ -6403,12 +6403,18 @@ static void cgroupns_put(struct ns_common *ns)
put_cgroup_ns(to_cg_ns(ns));
}
static struct user_namespace *cgroupns_owner(struct ns_common *ns)
{
return to_cg_ns(ns)->user_ns;
}
const struct proc_ns_operations cgroupns_operations = {
.name = "cgroup",
.type = CLONE_NEWCGROUP,
.get = cgroupns_get,
.put = cgroupns_put,
.install = cgroupns_install,
.owner = cgroupns_owner,
};
static __init int cgroup_namespaces_init(void)