ax25: enforce CAP_NET_RAW for raw sockets

When creating a raw AF_AX25 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>
CVE-2019-17052

(cherry picked from commit 0614e2b73768b502fc32a75349823356d98aae2c)
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index ca5207767dc27d48376eee9b80a6c7083a918372..bb222b882b6776481a17c9a4cc9ed6d97150c986 100644 (file)
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -855,6 +855,8 @@ static int ax25_create(struct net *net, struct socket *sock, int protocol,
                break;
 
        case SOCK_RAW:
+               if (!capable(CAP_NET_RAW))
+                       return -EPERM;
                break;
        default:
                return -ESOCKTNOSUPPORT;