Re: [tor-bugs] #15138 [Tor Browser]: Investigate TBB 4.5 hardening (e.g. DEP/ASLR) on all Platforms

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#15138: Investigate TBB 4.5 hardening (e.g. DEP/ASLR) on all Platforms
--------------------------+------------------------------------------------
     Reporter:  tom       |      Owner:  tom
         Type:  defect    |     Status:  new
     Priority:  normal    |  Milestone:
    Component:  Tor       |    Version:
  Browser                 |   Keywords:  tbb-security, TorBrowserTeam201504
   Resolution:            |  Parent ID:
Actual Points:            |
       Points:            |
--------------------------+------------------------------------------------

Comment (by cypherpunks):

 > for /GS (Visual Studio-compiled) binaries

 It's possible to use hex-string pattern, not long-term solution, but for
 the same version of VS it should to generate the same opcodes if secure
 cookies used for function.
 Like for x86, it generates:
 {{{
 mov     eax, ___security_cookie_at_xxxxxxxx
 xor     eax, ebp
 mov     [ebp+xx], eax
 }}}
 it is "A1 xx xx xx xx 33 C5 89 45 xx". Possible false positive results.
 Kludgy, buggy, but possible.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15138#comment:12>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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