Merge branch 'nsfs-ioctls' into HEAD

[cascardo/linux.git] / net / core / net_namespace.c

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2c2eb1b..e8be581 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -266,6 +266,16 @@ struct net *get_net_ns_by_id(struct net *net, int id)
        return peer;
 }
 
+static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
+{
+       return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
+}
+
+static void dec_net_namespaces(struct ucounts *ucounts)
+{
+       dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
+}
+
 /*
  * setup_net runs the initializers for the network namespace object.
  */
@@ -351,19 +361,27 @@ void net_drop_ns(void *p)
 struct net *copy_net_ns(unsigned long flags,
                        struct user_namespace *user_ns, struct net *old_net)
 {
+       struct ucounts *ucounts;
        struct net *net;
        int rv;
 
        if (!(flags & CLONE_NEWNET))
                return get_net(old_net);
 
+       ucounts = inc_net_namespaces(user_ns);
+       if (!ucounts)
+               return ERR_PTR(-ENOSPC);
+
        net = net_alloc();
-       if (!net)
+       if (!net) {
+               dec_net_namespaces(ucounts);
                return ERR_PTR(-ENOMEM);
+       }
 
        get_user_ns(user_ns);
 
        mutex_lock(&net_mutex);
+       net->ucounts = ucounts;
        rv = setup_net(net, user_ns);
        if (rv == 0) {
                rtnl_lock();
@@ -372,6 +390,7 @@ struct net *copy_net_ns(unsigned long flags,
        }
        mutex_unlock(&net_mutex);
        if (rv < 0) {
+               dec_net_namespaces(ucounts);
                put_user_ns(user_ns);
                net_drop_ns(net);
                return ERR_PTR(rv);
@@ -444,6 +463,7 @@ static void cleanup_net(struct work_struct *work)
        /* Finally it is safe to free my network namespace structure */
        list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
                list_del_init(&net->exit_list);
+               dec_net_namespaces(net->ucounts);
                put_user_ns(net->user_ns);
                net_drop_ns(net);
        }
@@ -996,11 +1016,17 @@ static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns)
        return 0;
 }
 
+static struct user_namespace *netns_owner(struct ns_common *ns)
+{
+       return to_net_ns(ns)->user_ns;
+}
+
 const struct proc_ns_operations netns_operations = {
        .name           = "net",
        .type           = CLONE_NEWNET,
        .get            = netns_get,
        .put            = netns_put,
        .install        = netns_install,
+       .owner          = netns_owner,
 };
 #endif