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Fixes a possible root cause of 11553 by only making 64 attempts at most to pick a circuitID. Previously, we would test every possible circuit ID until we found one or ran out. This algorithm succeeds probabilistically. As the comment says: This potentially causes us to give up early if our circuit ID space is nearly full. If we have N circuit IDs in use, then we will reject a new circuit with probability (N / max_range) ^ MAX_CIRCID_ATTEMPTS. This means that in practice, a few percent of our circuit ID capacity will go unused. The alternative here, though, is to do a linear search over the whole circuit ID space every time we extend a circuit, which is not so great either. This makes new vs old clients distinguishable, so we should try to batch it with other patches that do that, like 11438. |
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ReleaseNotes |
Tor protects your privacy on the internet by hiding the connection between your Internet address and the services you use. We believe Tor is reasonably secure, but please ensure you read the instructions and configure it properly. To build Tor from source: ./configure && make && make install Home page: https://www.torproject.org/ Download new versions: https://www.torproject.org/download.html Documentation, including links to installation and setup instructions: https://www.torproject.org/documentation.html Making applications work with Tor: https://wiki.torproject.org/noreply/TheOnionRouter/TorifyHOWTO Frequently Asked Questions: https://www.torproject.org/faq.html https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ