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Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

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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@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2021-09-22 08:56:56 -03:00 committed by Marcel Holtmann
parent 24ff62ae38
commit c05731d0c6
1 changed files with 3 additions and 0 deletions
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3
drivers/bluetooth/hci_ldisc.c
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@ -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
*/