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Re: [tor-bugs] #31653 [Core Tor/Tor]: Padding cells sent with 0ms delay cause circuit failures
#31653: Padding cells sent with 0ms delay cause circuit failures
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Reporter: pulls | Owner:
| mikeperry
Type: defect | Status:
| assigned
Priority: Medium | Milestone: Tor:
| 0.4.2.x-final
Component: Core Tor/Tor | Version: Tor:
| 0.4.1.5
Severity: Normal | Resolution:
Keywords: wtf-pad circpad-researchers-want | Actual Points:
042-should |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by mikeperry):
Tobias: FYI I have noticed a perf issue with this solution. Going back
into libevent for the callback introduces anywhere from 0-10ms delay, at
random, on just a client. On relays, it may be much worse.. Or maybe
better, if they are not building circuits (client path construction can
block the event loop for a long time).
For origin/master, this means we need to fast-path the 0-delay case still
somehow without callbacks, and also warn about this in the developer doc.
I bet trying to compose a packet train to fake a burst that actually has
9ms delay between packets is going to get seen by classifiers pretty
easily :/.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31653#comment:14>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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