[LLC]: Restrict LLC sockets to root

LLC currently allows users to inject raw frames, including IP packets
encapsulated in SNAP. While Linux doesn't handle IP over SNAP, other
systems do. Restrict LLC sockets to root similar to packet sockets.

[ Modified Patrick's patch to use CAP_NEW_RAW --DaveM ]

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 46cf962f7f88..8c50eb430c19 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -155,6 +155,9 @@ static int llc_ui_create(struct net *net, struct socket *sock, int protocol)
         struct sock *sk;
         int rc = -ESOCKTNOSUPPORT;
 
+        if (!capable(CAP_NET_RAW))
+                return -EPERM;
+
         if (net != &init_net)
                 return -EAFNOSUPPORT;