diff options
| author | Thadeu Lima de Souza Cascardo <cascardo@canonical.com> | 2023-07-31 15:59:42 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-13 12:59:55 +0200 |
| commit | ada28eb4b9561aab93942f3224a2e41d76fe57fa (patch) | |
| tree | 2a54dc79ed2165494b577426ec7e4941c6ee7224 | |
| parent | b58d0ac35f6d75ec1db8650a29dfd6f292c11362 (diff) | |
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: Thadeu 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/n_gsm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index fa49529682ce..c20f69a4c5e9 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2661,6 +2661,9 @@ 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; |