Bug#551802: GDM: fails to correctly add XDMCP user's session to utmp

[Margarita Manterola]

Package: gdm
Version: 2.20.7-4lenny1
Severity: important
Forwarded: https://bugzilla.gnome.org/show_bug.cgi?id=599103

Hi!

Since gdm version 2.20, gdm has stopped using the sessreg command to
register user sessions in utmp, and it uses its own code to do the
registration.  This code, however, does not work properly when the
session is remote.  All users are given the id that corresponds to the
first 4 characters of the host, which taking into account that no
resolution is used, tends to be "192.". Since this id is supposed to
be unique, all users are registered with the same id, and only one is
shown.

$ who
maxy     tty3         2009-10-15 10:46
jtelez                2009-10-20 09:41 (192.168.200.110:0)
marga    pts/19       2009-10-20 09:53 (192.168.200.108:0.0)

$ ps axu | grep gnome-session | grep -v dbus | grep -v seahorse
marga     4308  0.0  0.4  31624  5972 ?        Ssl  09:40   0:00
/usr/bin/gnome-session
maxy      4746  0.0  0.3  31536  5892 ?        Ssl  09:40   0:00
/usr/bin/gnome-session
jtelez    5647  0.0  0.4  31616  5984 ?        Ssl  09:41   0:00
/usr/bin/gnome-session

Despite the fact that there are actually 3 sessions started, only one
is shown by the who command, because the id is "192." for the three of
them.

More data about this bug can be found in this mail, by Maximiliano Curia:
http://mail.gnome.org/archives/gdm-list/2009-October/msg00004.html

Maximiliano has prepared a patch for gdm 2.20.7 (lenny's), and we've
tested it with success in our environment, which I'm attaching to this
mail.  It'd be nice if this patch could be applied to lenny's gdm, so
that other people using XDMCP don't have to experience the same.

I have already reported it upstream as:
https://bugzilla.gnome.org/show_bug.cgi?id=599103

-- 
Besos,
Marga
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