[PATCH 4.4 28/99] mISDN: enforce CAP_NET_RAW for raw sockets

From: Greg Kroah-Hartman
Date: Thu Oct 03 2019 - 11:56:53 EST


From: Ori Nimron <orinimron123@xxxxxxxxx>

[ Upstream commit b91ee4aa2a2199ba4d4650706c272985a5a32d80 ]

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

Signed-off-by: Ori Nimron <orinimron123@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/isdn/mISDN/socket.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -763,6 +763,8 @@ base_sock_create(struct net *net, struct

if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
+ if (!capable(CAP_NET_RAW))
+ return -EPERM;

sk = sk_alloc(net, PF_ISDN, GFP_KERNEL, &mISDN_proto, kern);
if (!sk)