Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!philabs!seismo!hao!hplabs!sri-unix!Michael.Young@cmu-cs-g From: Michael.Young%cmu-cs-g@sri-unix.UUCP Newsgroups: net.unix-wizards Subject: Re: ioctl-ability, the TIOCCDTR problem Message-ID: <2415@sri-arpa.UUCP> Date: Wed, 22-Jun-83 09:51:04 EDT Article-I.D.: sri-arpa.2415 Posted: Wed Jun 22 09:51:04 1983 Date-Received: Fri, 24-Jun-83 00:11:23 EDT Lines: 10 One good reason for allowing ioctls on a tty you have a writeable descriptor for is to allow setuid-someone-else (but maybe not root) programs to do neat things for you (like present a visual display of some sort). It seems to me that writing on someone else's terminal has almost as much negative potential as ioctl'ing it. Don't let your tty be writeable. [With 4.2, one ought to be able to set up an ipc port which can provide controlled (by tty owner) access to one's tty.] Michael