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    • Jed Davis's avatar
      Bug 1511560 - Allow dup and ftruncate (when needed) in SandboxPolicyCommon. r=gcp · 6fc87bff
      Jed Davis authored
      File descriptors are sometimes dup()ed in the process of communicating
      them over IPC; some of this may be unnecessary (due to insufficient
      use of move-only types), but dup() is relatively harmless.  It was
      previously allowed for both content and GMP, so this doesn't change
      anything.
      
      The handling of ftruncate is a little complicated -- it's used for IPC
      shared memory, but only when creating segments; so GMP doesn't allow
      it and should continue not allowing it, but content needs it and RDD
      will as well.  As a result, the subclass indicates if it will be needed.
      
      Note that even when we have memfd_create support (bug 1440203),
      ftruncate is still necessary even though brokering may not.
      
      Depends on D14523
      
      Differential Revision: https://phabricator.services.mozilla.com/D14524
      
      --HG--
      extra : moz-landing-system : lando
      6fc87bff
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