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Message-Id: <20230731185942.279611-1-cascardo@canonical.com>
Date: Mon, 31 Jul 2023 15:59:42 -0300
From: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
To: linux-serial@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>
Subject: [PATCH] tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc
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: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
---
drivers/tty/n_gsm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 1cdefac4dd1b..c7a787f10a9c 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3576,6 +3576,9 @@ static int gsmld_open(struct tty_struct *tty)
{
struct gsm_mux *gsm;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
if (tty->ops->write == NULL)
return -EINVAL;
--
2.34.1
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