[tor-bugs] #23104 [Applications/Tor Browser]: CSS line-height reveals the platform Tor Browser is running on
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Sat Sep 16 20:37:56 UTC 2017
#23104: CSS line-height reveals the platform Tor Browser is running on
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Reporter: gk | Owner: igt0
Type: defect | Status: accepted
Priority: Medium | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: tbb-fingerprinting-os | Actual Points:
Parent ID: | Points:
Reviewer: gk | Sponsor:
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Changes (by igt0):
* cc: igt0 (added)
* reviewer: => gk
Comment:
Many fonts have issues with their vertical metrics. they
are used to influence the height of ascenders and depth
of descenders. Gecko uses it to calculate the line height
(font height + ascender + descender), however because of
that idiosyncratic behavior across multiple operating
systems, it can be used to identify the user's OS.
The solution proposed in the patch(see attached patch) is to use a default
factor
to be multiplied as ascender and descender. This way all operating
systems will have the same line height.
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23104#comment:3>
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