[tor-bugs] #23915 [Applications/Tor Browser Sandbox]: 7.0.7 and later fails to work without `SECCOMP_FILTER_FLAG_TSYNC`.

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#23915: 7.0.7 and later fails to work without `SECCOMP_FILTER_FLAG_TSYNC`.
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 Reporter:  yawning                           |          Owner:  yawning
     Type:  defect                            |         Status:  closed
 Priority:  Medium                            |      Milestone:
Component:  Applications/Tor Browser Sandbox  |        Version:
 Severity:  Normal                            |     Resolution:  fixed
 Keywords:                                    |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by yawning):

 In an ideal world the workaround here will be selectively enabled base on
 support for `SECCOMP_FILTER_FLAG_TSYNC`.  I am opting to defer doing the
 "better" thing for now because:

  * Solving the "bad" case completely is likely intractable on old kernels,
 without going back to having `/proc` mounted.

  * Firefox detects support for the flag at runtime, and will always use it
 when available, so the "correct" thing happens regardless of what I do.

  * I'm feeling lazy.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23915#comment:2>
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