[tor-bugs] #13893 [Applications/Tor Browser]: Torbrowser crashes on start when using MS EMET 5.x

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Aug 29 14:02:29 UTC 2016


#13893: Torbrowser crashes on start when using MS EMET 5.x
-------------------------------------------------+-------------------------
 Reporter:  Diapolo                              |          Owner:  gk
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Major                                |     Resolution:
 Keywords:  tbb-security, tbb-crash, tbb-        |  Actual Points:
  usability-stoppoint-app, fuck-mingw-gcc,       |
  TorBrowserTeam201608, GeorgKoppen201608        |
Parent ID:  #12820                               |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorU
-------------------------------------------------+-------------------------

Comment (by gk):

 Getting back to this bug it seems with the switch to ESR45 the issues with
 `VirtualProtectEx()` are gone. My guess is this is due to
 https://bugzilla.mozilla.org/show_bug.cgi?id=1201205 (in particular due to
 {{{
 -    // restore protection; if this fails we can't really do anything
 about it
 -    VirtualProtectEx(GetCurrentProcess(), aOrigFunction, nBytes, op,
 &op);
 }}}
 . Now we seem to have only issues with `kernel32.LoadLibraryW` (see e.g.
 https://blog.torproject.org/blog/tor-0287-released-important-
 fixes#comment-203173). Not sure yet, where this exactly is coming from but
 it matches my test results done with EMET and Tor Browser 5.5.5/6.0.4.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13893#comment:66>
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