[tor-talk] Tor is released

Nick Mathewson nickm at torproject.org
Thu Dec 21 19:49:08 UTC 2017

Hi, all!

Tor is released.  If you build Tor from source code, why
not fetch it from our download page and try it out?  If you use
precompiled packages, then there should be releases soon.  There
probably won't be a Tor Browser release for this one; this issues
fixed here are mainly (but not exclusively) relevant to relays.

Changes in version - 2017-12-21
  Tor fixes a pair of bugs in the KIST and KISTLite
  schedulers that had led servers under heavy load to overload their
  outgoing connections. All relay operators running earlier 0.3.2.x
  versions should upgrade. This version also includes a mitigation for
  over-full DESTROY queues leading to out-of-memory conditions: if it
  works, we will soon backport it to earlier release series.

  This is the second release candidate in the 0.3.2 series. If we find
  no new bugs or regression here, then the first stable 0.3.2 release
  will be nearly identical to this.

  o Major bugfixes (KIST, scheduler):
    - The KIST scheduler did not correctly account for data already
      enqueued in each connection's send socket buffer, particularly in
      cases when the TCP/IP congestion window was reduced between
      scheduler calls. This situation lead to excessive per-connection
      buffering in the kernel, and a potential memory DoS. Fixes bug
      24665; bugfix on

  o Minor features (geoip):
    - Update geoip and geoip6 to the December 6 2017 Maxmind GeoLite2
      Country database.

  o Minor bugfixes (hidden service v3):
    - Bump hsdir_spread_store parameter from 3 to 4 in order to increase
      the probability of reaching a service for a client missing
      microdescriptors. Fixes bug 24425; bugfix on

  o Minor bugfixes (memory usage):
    - When queuing DESTROY cells on a channel, only queue the circuit-id
      and reason fields: not the entire 514-byte cell. This fix should
      help mitigate any bugs or attacks that fill up these queues, and
      free more RAM for other uses. Fixes bug 24666; bugfix

  o Minor bugfixes (scheduler, KIST):
    - Use a sane write limit for KISTLite when writing onto a connection
      buffer instead of using INT_MAX and shoving as much as it can.
      Because the OOM handler cleans up circuit queues, we are better
      off at keeping them in that queue instead of the connection's
      buffer. Fixes bug 24671; bugfix on

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