Patch "tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tty-n_gsm-require-cap_net_admin-to-attach-n_gsm0710-ldisc.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 67c37756898a5a6b2941a13ae7260c89b54e0d88 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Date: Mon, 31 Jul 2023 15:59:42 -0300
Subject: tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc

From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>

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: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230731185942.279611-1-cascardo@xxxxxxxxxxxxx
From: Salvatore Bonaccorso <carnil@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/tty/n_gsm.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2827,6 +2827,9 @@ static int gsmld_open(struct tty_struct
 {
 	struct gsm_mux *gsm;
 
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
 	if (tty->ops->write == NULL)
 		return -EINVAL;
 


Patches currently in stable-queue which might be from cascardo@xxxxxxxxxxxxx are

queue-5.15/tty-n_gsm-require-cap_net_admin-to-attach-n_gsm0710-ldisc.patch




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