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[Bug libc/14516] New: ttyname incorrectly fails if procfs is not available
- From: "siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Fri, 24 Aug 2012 08:51:03 +0000
- Subject: [Bug libc/14516] New: ttyname incorrectly fails if procfs is not available
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=14516
Bug #: 14516
Summary: ttyname incorrectly fails if procfs is not available
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: siddhesh@redhat.com
CC: drepper.fsp@gmail.com
Classification: Unclassified
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.
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