tor/changes/bug21278_prevention

  o Minor features (directory authority):
    - Directory authorities now reject descriptors that claim to be
      malformed versions of Tor. Helps prevent exploitation of bug 21278.
When examining descriptors as a dirserver, reject ones with bad versions This is an extra fix for bug 21278: it ensures that these descriptors and platforms will never be listed in a legit consensus. 2017-02-13 11:18:04 -05:00			`o Minor features (directory authority):`
			`- Directory authorities now reject descriptors that claim to be`
			`malformed versions of Tor. Helps prevent exploitation of bug 21278.`