diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-21 17:26:42 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-30 09:31:30 +0100 |
| commit | 7c0cca7c847e6e019d67b7d793efbbe3b947d004 (patch) | |
| tree | 7335a325bd870d4fd9d73ae1b9fb25ed33c562b2 /drivers/tty/tty_io.c | |
| parent | 83b21ed0fc2a7b17c6b9d4f72f664841f797380b (diff) | |
| download | lwn-7c0cca7c847e6e019d67b7d793efbbe3b947d004.tar.gz lwn-7c0cca7c847e6e019d67b7d793efbbe3b947d004.zip | |
tty: ldisc: add sysctl to prevent autoloading of ldiscs
By default, the kernel will automatically load the module of any line
dicipline that is asked for. As this sometimes isn't the safest thing
to do, provide a sysctl to disable this feature.
By default, we set this to 'y' as that is the historical way that Linux
has worked, and we do not want to break working systems. But in the
future, perhaps this can default to 'n' to prevent this functionality.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 21ffcce16927..5fa250157025 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -513,6 +513,8 @@ static const struct file_operations hung_up_tty_fops = { static DEFINE_SPINLOCK(redirect_lock); static struct file *redirect; +extern void tty_sysctl_init(void); + /** * tty_wakeup - request more data * @tty: terminal @@ -3483,6 +3485,7 @@ void console_sysfs_notify(void) */ int __init tty_init(void) { + tty_sysctl_init(); cdev_init(&tty_cdev, &tty_fops); if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) || register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0) |