Description of problem:
SSH chroot using pam_chroot.so does not work when there is no mounted /proc inside the chroot. The ssh server throws the following error in /var/log/secure:

Aug 24 13:26:06 rawhide sshd[11735]: fatal: openpty returns device for which ttyname fails.

while the client shows the following error and disconnects:

Connection to localhost closed by remote host.
Connection to localhost closed.

This failure occurs because sshd calls ttyname() and fails due to /proc not being present inside the chroot.

How reproducible:
Always.

Steps to Reproduce:
1. Set up a chroot:
   - Create the root folder structure (bin, lib, etc, var, dev, dev/pts) with essential binaries
   - Mount /dev/pts over /chroot/dev/pts
2. Set the password for user view
3. Add the following to /etc/pam.d/sshd:

session    required    pam_chroot.so onerr=fail debug

4. ssh -1 view localhost

Actual results:

Connection to localhost closed by remote host.
Connection to localhost closed.

Expected results:

User logs in.