appletalk: enforce CAP_NET_RAW for raw sockets

BugLink: https://bugs.launchpad.net/bugs/1847155
[ Upstream commit 6cc03e8aa36c51f3b26a0d21a3c4ce2809c842ac ]

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

Signed-off-by: Ori Nimron <orinimron123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index c5f0af8fe9ba8f57a44e4e2848f0524d00141049..b86676497514240d869603e53b21742fb3fe3dd1 100644 (file)
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1028,6 +1028,11 @@ 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)