ATM: CVE-2008-5079: duplicate listen() on socket corrupts the vcc table

As reported by Hugo Dias that it is possible to cause a local denial
of service attack by calling the svc_listen function twice on the same
socket and reading /proc/net/atm/*vc

Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/atm/svc.c b/net/atm/svc.c
index de1e4f2f3a43ea983f9a4eef973618772b69cc82..8fb54dc870b393d61373e308dfa8bec722d591a5 100644 (file)
--- a/net/atm/svc.c
+++ b/net/atm/svc.c
@@ -293,7 +293,10 @@ static int svc_listen(struct socket *sock,int backlog)
                error = -EINVAL;
                goto out;
        }
-       vcc_insert_socket(sk);
+       if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
+               error = -EADDRINUSE;
+               goto out;
+        }
        set_bit(ATM_VF_WAITING, &vcc->flags);
        prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
        sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local);
@@ -307,6 +310,7 @@ static int svc_listen(struct socket *sock,int backlog)
                goto out;
        }
        set_bit(ATM_VF_LISTEN,&vcc->flags);
+       vcc_insert_socket(sk);
        sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
        error = -sk->sk_err;
 out: