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Commit 7d303dee authored by Thadeu Lima de Souza Cascardo's avatar Thadeu Lima de Souza Cascardo Committed by Greg Kroah-Hartman
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tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc 



commit 67c37756898a5a6b2941a13ae7260c89b54e0d88 upstream.

Any unprivileged user can attach N_GSM0710 ldisc, but it requires
CAP_NET_ADMIN to create a GSM network anyway.

Require initial namespace CAP_NET_ADMIN to do that.

Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@canonical.com>
Link: https://lore.kernel.org/r/20230731185942.279611-1-cascardo@canonical.com


Cc: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1fb52bc1

drivers/tty/n_gsm.c

+3 −0
Original line number Diff line number Diff line
@@ -2435,6 +2435,9 @@ static int gsmld_open(struct tty_struct *tty) 
	struct gsm_mux *gsm;

	int ret;



	if (!capable(CAP_NET_ADMIN))

		return -EPERM;



	if (tty->ops->write == NULL)

		return -EINVAL;