[Pkg-privacy-maintainers] Bug#940656: black screen after upgrade

Wed Oct 23 11:32:30 BST 2019

Control: forwarded -1 https://trac.torproject.org/projects/tor/ticket/32215

I got the same issue, running buster
All windows are black here.

start-tor-browser --verbose shows:
[21969, Main Thread] WARNING: failed to open shm: Permission denied: file /var/tmp/build/firefox-d051ff6e2f60/ipc/chromium/src/base/shared_memory_posix.cc, line 142
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: Failed to lock new back buffer. (t=0.466201) [GFX1-]: Failed to lock new back buffer.

"aa-disable /etc/apparmor.d/torbrowser.Browser.firefox" fixes the issue.

"aa-audit /etc/apparmor.d/torbrowser.Browser.firefox" makes syslog show:
Oct 23 12:11:23 deimos kernel: [48692.792047] audit: type=1400 audit(1571825483.423:757): apparmor="DENIED" operation="mknod" profile="torbrowser_firefox" name="/dev/shm/org.mozilla.ipc.23967.0" pid=23967 comm="firefox.real" requested_mask="c" denied_mask="c" fsuid=1000 oui

Fixed by adding
/dev/shm/org.mozilla.*.* rw,
to /etc/apparmor.d/torbrowser.Browser.firefox
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