diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
new file mode 100644
index 0000000..3d79642
--- /dev/null
+++ b/kernel/user_namespace.c
@@ -0,0 +1,43 @@
+/*
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation, version 2 of the
+ *  License.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/nsproxy.h>
+#include <linux/user_namespace.h>
+
+struct user_namespace init_user_ns = {
+	.kref = {
+		.refcount	= ATOMIC_INIT(2),
+	},
+	.root_user = &root_user,
+};
+
+EXPORT_SYMBOL_GPL(init_user_ns);
+
+#ifdef CONFIG_USER_NS
+
+struct user_namespace * copy_user_ns(int flags, struct user_namespace *old_ns)
+{
+	struct user_namespace *new_ns;
+
+	BUG_ON(!old_ns);
+	get_user_ns(old_ns);
+
+	new_ns = old_ns;
+	return new_ns;
+}
+
+void free_user_ns(struct kref *kref)
+{
+	struct user_namespace *ns;
+
+	ns = container_of(kref, struct user_namespace, kref);
+	kfree(ns);
+}
+
+#endif /* CONFIG_USER_NS */