userns: Print out socket uids in a user namespace aware fashion.

Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Sridhar Samudrala <sri@us.ibm.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/net/llc/llc_proc.c b/net/llc/llc_proc.c
index a1839c0..7b4799c 100644
--- a/net/llc/llc_proc.c
+++ b/net/llc/llc_proc.c
@@ -151,7 +151,7 @@
 		   sk_wmem_alloc_get(sk),
 		   sk_rmem_alloc_get(sk) - llc->copied_seq,
 		   sk->sk_state,
-		   sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
+		   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
 		   llc->link);
 out:
 	return 0;