[Bug libc/14516] New: ttyname incorrectly fails if procfs is not available

[Bug libc/14516] New: ttyname incorrectly fails if procfs is not available

[siddhesh at redhat dot com]

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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[Bug libc/14516] ttyname incorrectly fails if procfs is not available

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14516

--- Comment #1 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-08-24 08:54:22 UTC ---
Step 2. should read "Set the password for a newly created user 'view'"

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[Bug libc/14516] ttyname incorrectly fails if procfs is not available

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14516

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at sourceware    |siddhesh at redhat dot com
                   |dot org                     |

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[Bug libc/14516] ttyname incorrectly fails if procfs is not available

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14516

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-08-30 12:05:41 UTC ---
Fixed in master.

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[Bug libc/14516] ttyname incorrectly fails if procfs is not available

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14516

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
Fixed in:
https://www.sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=050af9c4e

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[Bug libc/14516] ttyname incorrectly fails if procfs is not available

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14516

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jnair at ensim dot com

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
*** Bug 3353 has been marked as a duplicate of this bug. ***

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