diff options
| author | Ed Maste <emaste@FreeBSD.org> | 2026-05-25 13:59:40 +0000 |
|---|---|---|
| committer | Ed Maste <emaste@FreeBSD.org> | 2026-06-09 16:38:54 +0000 |
| commit | c289291a6736c01dd68fb8459ec3801859b0a59a (patch) | |
| tree | 5c3b666362e62b172a29ac747679a70813fa16ef | |
| parent | 13fb6dbc738f4ba30e78a8fb21efa1382c520d33 (diff) | |
tty: Add sysctl knob to globally disable TIOCSTI
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57233
| -rw-r--r-- | sys/kern/tty.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/kern/tty.c b/sys/kern/tty.c index 3d20d225087c..13147613f7f6 100644 --- a/sys/kern/tty.c +++ b/sys/kern/tty.c @@ -101,6 +101,10 @@ static int tty_drainwait = 5 * 60; SYSCTL_INT(_kern, OID_AUTO, tty_drainwait, CTLFLAG_RWTUN, &tty_drainwait, 0, "Default output drain timeout in seconds"); +static bool tty_tiocsti = true; +SYSCTL_BOOL(_security_bsd, OID_AUTO, tiocsti, CTLFLAG_RWTUN, + &tty_tiocsti, 0, "Allow TIOCSTI ioctl"); + /* * Set TTY buffer sizes. */ @@ -1651,6 +1655,10 @@ tty_set_winsize(struct tty *tp, const struct winsize *wsz) static int tty_sti_check(struct tty *tp, int fflag, struct thread *td) { + /* Check for global disable. */ + if (!tty_tiocsti) + return (EPERM); + /* Root can bypass all of our constraints. */ if (priv_check(td, PRIV_TTY_STI) == 0) return (0); |