Linux TIOCSPGRP Broken Locking

Linux: Broken locking in TIOCSPGRP leads to corrupted tty-pgrp refcount tiocspgrp, the handler for the TIOCSPGRP ioctl, has the following signature: static int tiocspgrpstruct ttystruct tty, struct ttystruct realtty, pidt user p It receives two ttystruct pointers because, for PTY pairs, userspace...