#30541: webgl readPixels FP entropy
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Reporter: Thorin | Owner: tbb-
| team
Type: defect | Status:
| needs_review
Priority: Very High | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: tbb-fingerprinting, | Actual Points:
TorBrowserTeam201905R, GeorgKoppen201905 |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by Thorin):
Replying to [comment:6 cypherpunks]:
> Also your test shows...webgl2: supported.. But `webgl2` shouldn't be
allowed.
Thanks. If the browser reports that webgl2 is supported, that's one bit of
entropy. I'll double check with some tests and kkapsner (it's his code),
opened an issue [1]. This is a browser level API check
What the browser does in a test after that can provide more entropy: e.g
error entropy (e.g blocked at a different step of the process: e.g slider
settings, click to play, extension interference, etc), or provide a hash
Not sure if meant the API check is flawed, or if TB blocks `WebGL2`.
[1] https://github.com/ghacksuserjs/TorZillaPrint/issues/37
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30541#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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