sysctl.conf: prevent autoloading of TTY line disciplines
Malicious/vulnerable TTY line disciplines have been subject of some
kernel exploits such as CVE-2017-2636, and since - to put it in Greg
Kroah-Hatrman's words - we do not "trust the userspace to do the right
thing", this reduces local kernel attack surface.
Further, there is no legitimate reason why an unprivileged user should
load kernel modules during runtime, anyway.
See also:
- https://lkml.org/lkml/2019/4/15/890
- https://a13xp0p0v.github.io/2017/03/24/CVE-2017-2636.html
Cc: Arne Fitzenreiter <arne.fitzenreiter@ipfire.org> Cc: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>