[Bluetooth] Restrict well known PSM to privileged users



The PSM values below 0x1001 of L2CAP are reserved for well known
services. Restrict the possibility to bind them to privileged
users.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

parent 73863976

net/bluetooth/l2cap.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -585,6 +585,12 @@ static int l2cap_sock_bind(struct socket sock, struct sockaddr addr, int addr_
		goto done;
		}

		if (la->l2_psm > 0 && btohs(la->l2_psm) < 0x1001 &&
		!capable(CAP_NET_BIND_SERVICE)) {
		err = -EACCES;
		goto done;
		}

		write_lock_bh(&l2cap_sk_list.lock);

		if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) {