[PATCH 5/5] nfc: enforce CAP_NET_RAW for raw sockets

[Tyler Hicks]

From: Ori Nimron <orinimron123 at gmail.com>

When creating a raw AF_NFC socket, CAP_NET_RAW needs to be checked
first.

Signed-off-by: Ori Nimron <orinimron123 at gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: David S. Miller <davem at davemloft.net>

CVE-2019-17056

(cherry picked from commit 3a359798b176183ef09efb7a3dc59abad1cc7104)
Signed-off-by: Tyler Hicks <tyhicks at canonical.com>
---
 net/nfc/llcp_sock.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 9b8742947aff..8dfea26536c9 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -1004,10 +1004,13 @@ static int llcp_sock_create(struct net *net, struct socket *sock,
 	    sock->type != SOCK_RAW)
 		return -ESOCKTNOSUPPORT;
 
-	if (sock->type == SOCK_RAW)
+	if (sock->type == SOCK_RAW) {
+		if (!capable(CAP_NET_RAW))
+			return -EPERM;
 		sock->ops = &llcp_rawsock_ops;
-	else
+	} else {
 		sock->ops = &llcp_sock_ops;
+	}
 
 	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
 	if (sk == NULL)
-- 
2.17.1