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[tor-bugs] #21656 [Applications/Tor Browser]: Add "low cost" hardening build flags to OS X

#21656: Add "low cost" hardening build flags to OS X
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     Reporter:  arthuredelstein           |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:  #21448
       Points:                            |   Reviewer:
      Sponsor:                            |
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 I would propose including the following flags in our OS X clang build:

 {{{
 -Werror=format
 -Werror=format-security
 -fstack-protector-strong
 -pie
 -fPIE (already there)
 -D_FORTIFY_SOURCE=2 -O1
 -Wl,-z,relro,-z,now
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21656>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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