Date: Sun, 14 Jun 2026 20:08:41 +0000 From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 16532b220c9c - stable/15 - tty: Add sysctl knob to globally disable TIOCSTI Message-ID: <6a2f0a49.332c2.504001cc@gitrepo.freebsd.org>
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The branch stable/15 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=16532b220c9cbd9fb0365a80a23cc435003e9986 commit 16532b220c9cbd9fb0365a80a23cc435003e9986 Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2026-05-25 13:59:40 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2026-06-14 20:08:29 +0000 tty: Add sysctl knob to globally disable TIOCSTI Reviewed by: markj PR: 293485 Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D57233 (cherry picked from commit c289291a6736c01dd68fb8459ec3801859b0a59a) (cherry picked from commit c94b8eee5bcb5f9d116cce9c831933115cfeeb19) --- sys/kern/tty.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/sys/kern/tty.c b/sys/kern/tty.c index afba05ec27b4..5f6afa49b70d 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, allow_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);home | help
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