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["Thomas Bushnell, BSG" <956848@xxxxxxxxxxxxxxxxxx>]

The documentation for pam_open_session says, "It should be noted that
the effective uid, geteuid(2). of the application should be of
sufficient privilege to perform such tasks as creating or mounting the
user's home directory for example."

AFAICT, this is contrary to Steve Langasek's assertion that "Session
modules are normally invoked after the application has changed uids to
that of the target user."

If lightdm has already dropped privileges at this point, I think it's a
bug.

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https://bugs.launchpad.net/bugs/956848

Title:
  pam_mkhomedir.so fails to create homedir in precise

Status in Light Display Manager:
  New
Status in “lightdm” package in Ubuntu:
  Confirmed

Bug description:
  
  I am testing Ubuntu Precise and I think I found a bug related to creation of home directories with pam_mkhomedir.so. I found it initially in an LDAP-based setup, but to nail down the problem I did a fresh re-install, added:
  session     optional          pam_mkhomedir.so umask=0077 skel=/etc/skel
  to /etc/pam.d/common-session and I removed the home directory of the user used during installation, so the bug has nothing to do with network auth.

  Anyway - when I login to lightdm I am successfully authenticated and
  the logon screen disappears, but I am presented with a black screen
  and nothing happens. I can login from text mode, the homedir is
  created and afterwards I can login, even using the graphical
  interface.

  I tried to see if this is related to lightdm or unity, but if I select
  Gnome classic, I get the same problem, if I switch to GDM, the problem
  remains.

  I am attaching the logs from lightdm. The syslog says:
  Mar 16 10:31:45 tubuntu kernel: [99829.342230] accounts-daemon[2152]: segfault at 10 ip b76c86c3 sp bfab7640 error 4 in libdbus-1.so.3.5.8[b76a3000+47000]
  Mar 16 10:31:45 tubuntu kernel: [99829.342545] gdm-session-wor[29440]: segfault at 6e756279 ip b743cd4c sp bf84b250 error 4 in libc-2.15.so[b73ca000+19e000]
  but I cannot say if this caused the issue or was caused by the issue.

  I hope somebody can have a look at this. I can help to do some
  investigating, unfortunately I don't know where to look.

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