[tbb-bugs] #29566 [Applications/Tor Browser]: math.cos reveals OS

Tor Bug Tracker & Wiki blackhole at torproject.org
Sat Feb 23 13:45:12 UTC 2019

#29566: math.cos reveals OS
 Reporter:  Thorin                    |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-fingerprinting-os     |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:

Comment (by Thorin):

 Replying to [comment:1 cypherpunks]:
 > #13018

 Thanks :) Yup, that was the ticket. Wow, 4 years. That ticket is about the
 functions added in FF25+ - e.g like those in
 https://ghacksuserjs.github.io/TorZillaPrint/TorZillaPrint.html#math -
 which dosn't **seem** to differ in 60+ anyway (needs for testing I guess)

 Also note, that sin() can also have differences, I'm just not sure on
 which values over which platforms produce the desired results (and I could
 probably find more functions) - I'm sure the solution for this would fix
 any functions, so I'm not going to dig any further (except to show combos
 for mac and other android versions using cos)

 Edit: https://developer.mozilla.org/en-
 - `cos`, `sin` etc were FF version 1 compatible

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29566#comment:2>
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