Bug 350

Summary:	sshd leaks fd to pty for interactive sessions
Product:	Portable OpenSSH	Reporter:	Wichert Akkerman <mindrot>
Component:	sshd	Assignee:	OpenSSH Bugzilla mailing list <openssh-bugs>
Status:	CLOSED INVALID
Severity:	normal
Priority:	P2
Version:	-current
Hardware:	ix86
OS:	Linux

Description Wichert Akkerman 2002-07-10 20:03:53 AEST

Using OpenSSH 3.4p1 with publickey authentication I get an
extra fd 10 to the pty:

[tornado;~]-15> ssh localhost

[tornado;~]-1> ls -l /proc/467/fd
total 0
lrwx------    1 wichert  wichert        64 Jul 10 12:02 0 -> /dev/pts/3
lrwx------    1 wichert  wichert        64 Jul 10 12:02 1 -> /dev/pts/3
lrwx------    1 wichert  wichert        64 Jul 10 12:02 10 -> /dev/pts/3
lrwx------    1 wichert  wichert        64 Jul 10 12:02 2 -> /dev/pts/3

(467 being the pid of the shell created)

Comment 1 Wichert Akkerman 2002-07-10 20:10:34 AEST

This happens with both privsep enabled and disabled.

Comment 2 Markus Friedl 2002-07-10 20:40:20 AEST

i get this with ksh(1) on OpenBSD, but not with rc(1), and ktrace
suggest that it's a fctnl with F_DUPFD done by ksh, so i think
it's not sshd's fault.

Comment 3 Wichert Akkerman 2002-07-10 21:44:55 AEST

More information: I get this with multiple different shells (bash and zsh). I
am also able to reproduce this with OpenSSH 3.0.2p1.

Comment 4 Markus Friedl 2002-07-10 21:54:48 AEST

did you try a non-jobcontrol shell?

Comment 5 Markus Friedl 2002-07-10 22:03:33 AEST

i can reproduce this on OpenBSD with ksh from the console,
so it's not an OpenSSH bug.

Comment 6 Damien Miller 2004-04-14 12:24:18 AEST

Mass change of RESOLVED bugs to CLOSED