Bluetooth: Add support for trust verification of management commands

Check the required trust level of each management command with the trust
level of the management socket. If it does not match up, then return the
newly introduced permission denied error.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

net/bluetooth/mgmt.c

@@ -6379,6 +6379,13 @@ int mgmt_control(struct hci_mgmt_chan *chan, struct sock *sk,
 
 	handler = &chan->handlers[opcode];
 
+	if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
+	    !(handler->flags & HCI_MGMT_UNTRUSTED)) {
+		err = mgmt_cmd_status(sk, index, opcode,
+				      MGMT_STATUS_PERMISSION_DENIED);
+		goto done;
+	}
+
 	if (index != MGMT_INDEX_NONE) {
 		hdev = hci_dev_get(index);
 		if (!hdev) {