diff options
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index fe77a3d41326..a6a16cf986b7 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -2268,11 +2268,15 @@ static int tty_fasync(int fd, struct file *filp, int on) * * Called functions take tty_ldiscs_lock * * current->signal->tty check is safe without locks */ +static bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI); static int tiocsti(struct tty_struct *tty, char __user *p) { char ch, mbz = 0; struct tty_ldisc *ld; + if (!tty_legacy_tiocsti) + return -EIO; + if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(ch, p)) @@ -3574,6 +3578,13 @@ void console_sysfs_notify(void) static struct ctl_table tty_table[] = { { + .procname = "legacy_tiocsti", + .data = &tty_legacy_tiocsti, + .maxlen = sizeof(tty_legacy_tiocsti), + .mode = 0644, + .proc_handler = proc_dobool, + }, + { .procname = "ldisc_autoload", .data = &tty_ldisc_autoload, .maxlen = sizeof(tty_ldisc_autoload), |