[PATCH 3/5] appletalk: enforce CAP_NET_RAW for raw sockets

[Tyler Hicks]

From: Ori Nimron <orinimron123 at gmail.com>

When creating a raw AF_APPLETALK 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-2019-17054

(cherry picked from commit 6cc03e8aa36c51f3b26a0d21a3c4ce2809c842ac)
Signed-off-by: Tyler Hicks <tyhicks at canonical.com>
---
 net/appletalk/ddp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index a8cb6b2e20c1..5a203acdcae5 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1023,6 +1023,11 @@ static int atalk_create(struct net *net, struct socket *sock, int protocol,
 	 */
 	if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
 		goto out;
+
+	rc = -EPERM;
+	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+		goto out;
+
 	rc = -ENOMEM;
 	sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern);
 	if (!sk)
-- 
2.17.1