[tor-bugs] #18800 [Tor Browser]: Remove localhost DNS lookup in nsProfileLock.cpp

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#18800: Remove localhost DNS lookup in nsProfileLock.cpp
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 Reporter:  mcs                                  |          Owner:  mcs
     Type:  defect                               |         Status:
 Priority:  Medium                               |  needs_information
Component:  Tor Browser                          |      Milestone:
 Severity:  Normal                               |        Version:
 Keywords:  ff45-esr, tbb-6.0a5,                 |     Resolution:
  TorBrowserTeam201604                           |  Actual Points:
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Changes (by mcs):

 * cc: mikeperry (added)
 * status:  new => needs_information


Comment:

 Kathy and I are not sure what the best fix is for this issue.  A symlink
 lock is used on Mac OS and Linux if fnctl-based locking fails.  The
 symlink is named .parentlock and points to a "signature" string that looks
 like: ipaddr:pid, e.g.,
   .parentlock -> 192.168.1.99:54301
 One approach would be to always use 127.0.0.1 for the IP address. Other
 ideas? I guess with modern NFS we will never get here because fcntl() is
 supported by the (network) file system? Kathy and I are not 100% sure
 about that though.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18800#comment:1>
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