[tbb-bugs] #21675 [Applications/Tor Browser]: Set window.navigator.hardwareConcurrency to a constant value

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Mar 9 15:07:56 UTC 2017

#21675: Set window.navigator.hardwareConcurrency to a constant value
 Reporter:  gk                            |          Owner:  tbb-team
     Type:  defect                        |         Status:  new
 Priority:  Medium                        |      Milestone:
Component:  Applications/Tor Browser      |        Version:
 Severity:  Normal                        |     Resolution:
 Keywords:  tbb-fingerprinting, ff52-esr  |  Actual Points:
Parent ID:                                |         Points:
 Reviewer:                                |        Sponsor:  Sponsor4

Comment (by cypherpunks):

 Replying to [ticket:21675 gk]:
 > We should avoid leaking the amount of cores a user has available by
 asking `window.navigator.hardwareConcurrency`. Not sure which value we
 should give back and if we should return the same one for all users.
 Of course, one! Are you sure asking to give workers of one site more than
 1 core?

 Maybe, this can help:
 // return the maximum number of cores that navigator.HardwareConcurrency
 pref("dom.maxHardwareConcurrency", 1);

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21675#comment:3>
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