Bug#760035: gdm3 listen XDMCP always on udp6 177

[Sergey]

Package: gdm3
Version: 3.4.1-8
Severity: normal
Tags: ipv6

Hello.
Gdm3 always listens XDMCP on udp6 but not on udp, even if udp6 was disabled in
system.

root at hme:/home/sergey# netstat -anup | grep 177
udp6       0      0 :::177                  :::*
3878/gdm3

root at hme:/home/sergey# ps -ef | grep 3878
root      3878     1  0 08:30 ?        00:00:00 /usr/sbin/gdm3
root      4051  3878  0 08:30 ?        00:00:00 /usr/lib/gdm3/gdm-simple-slave
--display-id /org/gnome/DisplayManager/Display1

root at hme:/home/sergey# cat /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.eth0.disable_ipv6 = 1


root at hme:/home/sergey# cat /etc/gdm3/daemon.conf | grep -v \#
[daemon]

[security]
DisallowTCP=false

[xdmcp]
Enable=true
MaxPending=4
MaxSessions=16
MaxWait=30
MaxWaitIndirect=30
PingIntervalSeconds=60
MaxPendingIndirect=4
DisplaysPerHost=2
HonorIndirect=true
Port=177

[greeter]

[chooser]

[debug]



-- System Information:
Debian Release: 7.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gdm3 depends on:
ii  accountsservice                           0.6.21-8
ii  adduser                                   3.113+nmu3
ii  dconf-gsettings-backend                   0.12.1-3
ii  dconf-tools                               0.12.1-3
ii  debconf [debconf-2.0]                     1.5.49
ii  dpkg                                      1.16.15
ii  gir1.2-freedesktop                        1.32.1-1
ii  gir1.2-glib-2.0                           1.32.1-1
ii  gnome-session [x-session-manager]         3.4.2.1-4
ii  gnome-session-bin                         3.4.2.1-4
ii  gnome-session-fallback [x-session-manage  3.4.2.1-4
ii  gnome-settings-daemon                     3.4.2+git20121218.7c1322-3+deb7u3
ii  gnome-terminal [x-terminal-emulator]      3.4.1.1-2
ii  gsettings-desktop-schemas                 3.4.2-3
ii  libaccountsservice0                       0.6.21-8
ii  libatk1.0-0                               2.4.0-2
ii  libattr1                                  1:2.4.46-8
ii  libaudit0                                 1:1.7.18-1.1
ii  libc6                                     2.13-38+deb7u4
ii  libcairo-gobject2                         1.12.2-3
ii  libcairo2                                 1.12.2-3
ii  libcanberra-gtk3-0                        0.28-6
ii  libcanberra0                              0.28-6
ii  libdbus-1-3                               1.6.8-1+deb7u3
ii  libdbus-glib-1-2                          0.100.2-1
ii  libfontconfig1                            2.9.0-7.1
ii  libgdk-pixbuf2.0-0                        2.26.1-1
ii  libglib2.0-0                              2.33.12+really2.32.4-5
ii  libglib2.0-bin                            2.33.12+really2.32.4-5
ii  libgtk-3-0                                3.4.2-7
ii  libpam-modules                            1.1.3-7.1
ii  libpam-runtime                            1.1.3-7.1
ii  libpam0g                                  1.1.3-7.1
ii  libpango1.0-0                             1.30.0-1
ii  librsvg2-common                           2.36.1-2
ii  libselinux1                               2.1.9-5
ii  libupower-glib1                           0.9.17-1
ii  libwrap0                                  7.6.q-24
ii  libx11-6                                  2:1.5.0-1+deb7u1
ii  libxau6                                   1:1.0.7-1
ii  libxdmcp6                                 1:1.1.1-1
ii  libxklavier16                             5.2.1-1
ii  libxrandr2                                2:1.3.2-2+deb7u1
ii  lsb-base                                  4.1+Debian8+deb7u1
ii  metacity [x-window-manager]               1:2.34.3-4
ii  policykit-1-gnome                         0.105-2
ii  upower                                    0.9.17-1
ii  x11-common                                1:7.7+3~deb7u1
ii  x11-xserver-utils                         7.7~3
ii  xterm [x-terminal-emulator]               278-4

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.5.3-2
ii  desktop-base               7.0.3
ii  gnome-icon-theme           3.4.0-2
ii  gnome-icon-theme-symbolic  3.4.0-2
ii  x11-xkb-utils              7.7~1
ii  xserver-xephyr             2:1.12.4-6+deb7u2
ii  xserver-xorg               1:7.7+3~deb7u1
ii  zenity                     3.4.0-2

Versions of packages gdm3 suggests:
ii  gnome-orca            3.4.2-2
ii  gnome-shell           3.4.2-7+deb7u1
pn  gok                   <none>
ii  libpam-gnome-keyring  3.4.1-5

-- Configuration Files:
/etc/gdm3/daemon.conf changed:
[daemon]
[security]
DisallowTCP=false
[xdmcp]
Enable=true
MaxPending=4
MaxSessions=16
MaxWait=30
MaxWaitIndirect=30
PingIntervalSeconds=60
MaxPendingIndirect=4
DisplaysPerHost=2
HonorIndirect=true
Port=177
[greeter]
[chooser]
[debug]


-- debconf information:
* shared/default-x-display-manager: gdm3
  gdm3/daemon_name: /usr/sbin/gdm3