Any unprivileged user can attach N_HCI ldisc and send packets coming from a
virtual controller by using PTYs.
Require initial namespace CAP_NET_ADMIN to do that.
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
---
drivers/bluetooth/hci_ldisc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 5ed2cfa7da1d..5e32e4d5367a 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -479,6 +479,9 @@ static int hci_uart_tty_open(struct tty_struct *tty)
BT_DBG("tty %p", tty);
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
/* Error if the tty has no write op instead of leaving an exploitable
* hole
*/
--
2.30.2
