LXDM logins not being logged in utmp

Bug #1201134 reported by Jani Uusitalo on 2013-07-14
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lxdm (Ubuntu)

Bug Description

This is basically the same as bug #870297, but for LXDM.

Systems using LXDM have no entries in the utmp record for logins, so tools like 'w' and 'who' do not show LXDM sessions.

1. Start Lubuntu system
2. Log into session
3. Open gnome-terminal
4. Run 'who' command

Expected result:
You should see TWO entries (the first is from LXDM, the second is from gnome-terminal):
 pts/0 YYYY-MM-DD HH:MM (:0)

Observed result:
You see only one entry:
 pts/0 YYYY-MM-DD HH:MM (:0)

Additional info:
Used gnome-terminal just for consistency with the LightDM report; lxterminal also doesn't seem to update login records so if you use it instead, observed result is actually "no entries at all" (and issue for another report). Also, bug #1027805 about wtmp records is similarly applicable to LXDM, but that remains to be fixed even in LightDM...

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lxdm 0.4.1-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-50.76-generic 3.2.48
Uname: Linux 3.2.0-50-generic i686
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: i386
Date: Sun Jul 14 18:50:56 2013
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MarkForUpload: True
SourcePackage: lxdm
UpgradeStatus: Upgraded to precise on 2012-07-30 (348 days ago)

Jani Uusitalo (uusijani) wrote :
Michael Bloom (mabloom) wrote :

I don't think the authors consider this a bug. As of 18.04, it's still hardcoded this way. The following is one of two essentially (for your purposes) identical instances:


Probably, replacing those flags with a zero in both cases would be sufficient for a personal system, although I haven't checked for unanticipated consequences.
In my opinion, they should have at least made it an option to configure.

I did a quick test just now, of manually zeroing the argument in gdb, which verified that something like the following should work:
Probably something like:
#define LOG_UTMP 0

except it only works for root, presumably because before the call to the fork (or spawn) routine, there must be a setuid call that is too early. I hope it's not in the vte library, but I doubt it, if other terminals (such as xterm) do the right thing.

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