From bcac25a58bfc6bd79191ac5d7afb49bea96da8c9 Mon Sep 17 00:00:00 2001 From: Andrey Vagin Date: Tue, 6 Sep 2016 00:47:13 -0700 Subject: 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 Signed-off-by: Andrei Vagin Signed-off-by: Eric W. Biederman --- ipc/namespace.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'ipc/namespace.c') diff --git a/ipc/namespace.c b/ipc/namespace.c index d87e6baa1323..578d93be619d 100644 --- a/ipc/namespace.c +++ b/ipc/namespace.c @@ -165,10 +165,16 @@ static int ipcns_install(struct nsproxy *nsproxy, struct ns_common *new) return 0; } +static struct user_namespace *ipcns_owner(struct ns_common *ns) +{ + return to_ipc_ns(ns)->user_ns; +} + const struct proc_ns_operations ipcns_operations = { .name = "ipc", .type = CLONE_NEWIPC, .get = ipcns_get, .put = ipcns_put, .install = ipcns_install, + .owner = ipcns_owner, }; -- cgit v1.2.3-55-g7522