Commit d1d3a0f7 authored Nov 08, 2015 by Peter Hurley Committed by Greg Kroah-Hartman Dec 13, 2015

tty: Only allow slave pty as controlling tty



A master pty should never be a controlling tty in Linux; if the
master pty is specified to ioctl(TIOCSCTTY), silently substitute the slave
pty as the controlling tty.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 83db1df4

drivers/tty/tty_io.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2866,7 +2866,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
		no_tty();
		return 0;
		case TIOCSCTTY:
		return tiocsctty(tty, file, arg);
		return tiocsctty(real_tty, file, arg);
		case TIOCGPGRP:
		return tiocgpgrp(tty, real_tty, p);
		case TIOCSPGRP: