Messages in this thread Patch in this message | | | From | Thadeu Lima de Souza Cascardo <> | Subject | [PATCH] Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc | Date | Wed, 22 Sep 2021 08:56:56 -0300 |
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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> --- 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
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