[Vserver] sshd and ptys

From: Jim Wight <j.k.wight_at_ncl.ac.uk>
Date: Wed 05 Oct 2005 - 13:05:27 BST
Message-Id: <1128513927.23173.307.camel@beadnell.ncl.ac.uk>

I'm returning to VServer after being away from it for over a year. One
thing that worked previously and isn't working for me now is remotely
logging in via ssh. I see the following in /var/log/messages:

sshd[11932]: error: openpty: Permission denied
sshd[11932]: error: session_pty_req: session 0 alloc failed

I can reproduce the problem with a simple program that calls openpty.
The output from strace'ing it contains:

open("/dev/ptmx", O_RDWR) = 3
statfs("/dev/pts", {f_type="DEVPTS_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, TIOCGPTN, [1]) = 0
stat64("/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 1), ...}) = 0
statfs("/dev/pts/1", {f_type="DEVPTS_SUPER_MAGIC", f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
ioctl(3, TIOCSPTLCK, [0]) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(3, TIOCGPTN, [1]) = 0
stat64("/dev/pts/1", {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 1), ...}) = 0
open("/dev/pts/1", O_RDWR|O_NOCTTY) = -1 EACCES (Permission denied)

Inside the vserver, /dev looks like this:

# ls -l /dev
total 0
crw-rw-rw- 1 root root 1, 7 Oct 3 08:15 full
srw-rw-rw- 1 root root 0 Oct 5 11:52 log
crw-rw-rw- 1 root root 1, 3 Oct 3 08:15 null
crw-rw-rw- 1 root root 5, 2 Oct 3 08:16 ptmx
drwxr-xr-x 2 root root 0 Oct 3 15:36 pts
crw-r--r-- 1 root root 1, 8 Oct 3 08:16 random
crw-rw-rw- 1 root root 5, 0 Oct 3 08:16 tty
crw-r--r-- 1 root root 1, 9 Oct 3 08:16 urandom
crw-rw-rw- 1 root root 1, 5 Oct 3 08:17 zero

What have I missed?

I am using kernel 2.6.12.5 with patch-2.6.12.4-vs2.0 and
util-server-0.30.208. The host's filesystem is Fedora Core 2 and the
vserver's FC4.

Jim

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Received on Wed Oct 5 13:17:17 2005

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