summaryrefslogtreecommitdiffstats
path: root/kernel/pid_namespace.c
diff options
context:
space:
mode:
authorAndrey Vagin <avagin@openvz.org>2016-09-06 09:47:13 +0200
committerEric W. Biederman <ebiederm@xmission.com>2016-09-23 02:59:39 +0200
commitbcac25a58bfc6bd79191ac5d7afb49bea96da8c9 (patch)
tree28a8ae71b2939267deba0807bcbbed28e77470c0 /kernel/pid_namespace.c
parentLinux 4.8-rc1 (diff)
downloadlinux-bcac25a58bfc6bd79191ac5d7afb49bea96da8c9.tar.xz
linux-bcac25a58bfc6bd79191ac5d7afb49bea96da8c9.zip
kernel: add a helper to get an owning user namespace for a namespace
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>
Diffstat (limited to 'kernel/pid_namespace.c')
-rw-r--r--kernel/pid_namespace.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index a65ba137fd15..c02d744225e1 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -388,12 +388,18 @@ static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns)
return 0;
}
+static struct user_namespace *pidns_owner(struct ns_common *ns)
+{
+ return to_pid_ns(ns)->user_ns;
+}
+
const struct proc_ns_operations pidns_operations = {
.name = "pid",
.type = CLONE_NEWPID,
.get = pidns_get,
.put = pidns_put,
.install = pidns_install,
+ .owner = pidns_owner,
};
static __init int pid_namespaces_init(void)