[tbb-bugs] #20283 [Applications/Tor Browser]: Tor Browser should run without a `/proc` filesystem.

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#20283: Tor Browser should run without a `/proc` filesystem.
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 Reporter:  yawning                   |          Owner:  pospeselr
     Type:  defect                    |         Status:  assigned
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-sandboxing            |  Actual Points:
Parent ID:  #20773                    |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by pospeselr):

 As mentioned by cypherpunks, the issue here only occurs on the main thread
 which you can verify with a little spelunking through the glibc source.
 The relevant query APIs work expected on non-main threads since pthreads
 populates the required info in memory.

 Verifying a patch now on TreeHerder that fixes this issue by reading the
 __libc_stack_end symbol (glibc sets this void* to the first stack frame
 during program init).  Solution suggested by mozilla's jld, and the folks
 in #jsapi (those paying attention at least) didn't seem offended at the
 idea of doing so for the main thread.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20283#comment:18>
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