Bug#850116: gdm3: gnome-session-f called from gdm3 SEGVs when run with SE Linux enforcing

[Russell Coker]

Source: gdm3
Severity: normal

gdm3 fails to start when SE Linux is enforcing and the kernel message log has
many messages like the ones below.

To reproduce this, have a system running gdm3 and run the following commands:
apt-get install selinux-policy-default selinux-basics
selinux-activate
reboot
selinux-config-enforcing
reboot

Then you should have the SEGVs.

I don't expect you to fix this for Stretch.  Anyone who wants an X login
program running with SE Linux will just have to use sddm or xdm.

[81568.555619] gnome-session-f[18771]: segfault at 0 ip 00007f42969f8d39 sp 00007ffc25d41600 error 4 in libgtk-3.so.0.2200.5[7f4296716000+6fe000]
[81571.051691] gnome-session-f[18804]: segfault at 0 ip 00007f55c7a42d39 sp 00007ffd7033a450 error 4 in libgtk-3.so.0.2200.5[7f55c7760000+6fe000]
[81574.131269] gnome-session-f[18847]: segfault at 0 ip 00007fa86c064d39 sp 00007fff88d7ef00 error 4 in libgtk-3.so.0.2200.5[7fa86bd82000+6fe000]
[81577.329807] gnome-session-f[18885]: segfault at 0 ip 00007f951567cd39 sp 00007ffca644e670 error 4 in libgtk-3.so.0.2200.5[7f951539a000+6fe000]
[81580.502957] gnome-session-f[18927]: segfault at 0 ip 00007fec99f30d39 sp 00007ffc5d79c460 error 4 in libgtk-3.so.0.2200.5[7fec99c4e000+6fe000]
[81583.586522] gnome-session-f[18971]: segfault at 0 ip 00007f596695cd39 sp 00007fff455aeef0 error 4 in libgtk-3.so.0.2200.5[7f596667a000+6fe000]
[81586.712827] gnome-session-f[19004]: segfault at 0 ip 00007f0a5d94ed39 sp 00007ffd452eed80 error 4 in libgtk-3.so.0.2200.5[7f0a5d66c000+6fe000]

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.8.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)