[kernel-hardening] [RFC 3/5 v3] net: restore net_create and make it globally visible

[Vasiliy Kulikov <segoon@openwall.com>]

This reverts commit 911cb193f3eb0370f20fbba712211e55ffede4de and
makes net_create() globally visible.  net_create() will be needed
for fake_net in fs/proc/proc_net.c. 

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
---
 include/net/net_namespace.h |    2 ++
 net/core/net_namespace.c    |   12 ++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 2bf9ed9..5d5328c 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -116,6 +116,8 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 }
 #endif /* CONFIG_NET */
 
+extern struct net *net_create(void);
+
 
 extern struct list_head net_namespace_list;
 
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 6c6b86d..c90f0db 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -210,14 +210,11 @@ static void net_free(struct net *net)
 	kmem_cache_free(net_cachep, net);
 }
 
-struct net *copy_net_ns(unsigned long flags, struct net *old_net)
+struct net *net_create(void)
 {
 	struct net *net;
 	int rv;
 
-	if (!(flags & CLONE_NEWNET))
-		return get_net(old_net);
-
 	net = net_alloc();
 	if (!net)
 		return ERR_PTR(-ENOMEM);
@@ -236,6 +233,13 @@ struct net *copy_net_ns(unsigned long flags, struct net *old_net)
 	return net;
 }
 
+struct net *copy_net_ns(unsigned long flags, struct net *old_net)
+{
+	if (!(flags & CLONE_NEWNET))
+		return get_net(old_net);
+	return net_create();
+}
+
 static DEFINE_SPINLOCK(cleanup_list_lock);
 static LIST_HEAD(cleanup_list);  /* Must hold cleanup_list_lock to touch */
 
-- 
1.7.0.4