Add the ptm device to pty(4). By opening /dev/ptm and using the PTMGET

ioctl(2), an unprivileged process may allocate a pty and have its owner
and mode set appropriately.  This means that programs such as xterm and
screen no longer need to be setuid.  Programs using the openpty()
function require zero changes and will "just work".

Designed by beck@ and deraadt@; changes by beck@ with cleanup (and
a rewrite of the vnode bits) by art@ and tweaks/bugfixes by me.
Tested by many.

1 files changed, 7 insertions, 2 deletions

diff --git a/etc/etc.i386/MAKEDEV b/etc/etc.i386/MAKEDEV
index 5299a60ac19..82001ecf440 100644
--- a/etc/etc.i386/MAKEDEV
+++ b/etc/etc.i386/MAKEDEV
@@ -54,6 +54,7 @@
 #	tty[0-7][0-9a-f]	NS16x50 serial ports
 #	ttyc*	Cyclades serial ports
 # Pseudo terminals:
+#	ptm	pty master device
 #	tty*	set of 16 slave psuedo terminals
 #	pty*	set of 16 master pseudo terminals
 # Printers:
@@ -457,6 +458,10 @@ pty*)
 	done
 	;;
 
+ptm)
+	M ptm c 81 0 666
+	;;
+
 tty[0-7][0-9a-f])
 	U=${i#tty*}
 	o=$(h2d $U)
@@ -575,8 +580,8 @@ all)
 	R sd3 sd4 cd0 cd1 rd0 tun0 tun1 tun2 tun3 bpf0 bpf1 bpf2 bpf3
 	R bpf4 bpf5 bpf6 bpf7 bpf8 bpf9 pty0 pty1 pty2 fd1 fd1B fd1C
 	R fd1D fd1E fd1F fd1G fd1H fd0 fd0B fd0C fd0D fd0E fd0F fd0G
-	R fd0H xfs0 ss0 ss1 ch0 ses0 gpr0 wscons pci iop0 iop1 usbs
-	R rmidi0 rmidi1 rmidi2 rmidi3 rmidi4 rmidi5 rmidi6 rmidi7
+	R fd0H xfs0 ss0 ss1 ch0 ses0 ptm gpr0 wscons pci iop0 iop1
+	R usbs rmidi0 rmidi1 rmidi2 rmidi3 rmidi4 rmidi5 rmidi6 rmidi7
 	R tuner0 radio0 music0 speaker audio0 wdt0 wt0 uk0 random joy0
 	R joy1 lpa0 lpa1 lpa2 lpt0 lpt1 lpt2 lkm tty00 tty01 tty02
 	R tty03 ttyc0 ttyc1 ttyc2 ttyc3 ttyc4 ttyc5 ttyc6 ttyc7 apm