[tor-bugs] #3135 [Tor Relay]: Saveconf request can terminate tor

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#3135: Saveconf request can terminate tor
-----------------------+----------------------------------------------------
 Reporter:  atagar     |          Owner:     
     Type:  defect     |         Status:  new
 Priority:  minor      |      Milestone:     
Component:  Tor Relay  |        Version:     
 Keywords:             |         Parent:     
   Points:             |   Actualpoints:     
-----------------------+----------------------------------------------------
 Hi, in a very weird edge case a controller issuing a saveconf request can
 terminate Tor. I just reproed this with...
 Tor v0.2.3.1-alpha-dev (git-e6980faec43504ac)

 Repro steps:
 1. Start tor with an open control port
 2. Chown the torrc to root so the tor user lacks read/write permissions
 3. Issue a SAVECONF request
 4. Tor crashes with...
 May 10 18:25:39.000 [warn] Could not open "/home/atagar/.tor/torrc":
 Permission denied
 Segmentation fault

 The permissions on the torrc during the crash...
 -rw------- 1 root atagar 274 2011-05-10 10:01 .tor/torrc

 Here's the quick method for issuing the saveconf request via torctl:
 {{{
 >>> from TorCtl import TorCtl
 >>> conn = TorCtl.connect()
 >>> conn.sendAndRecv("SAVECONF\r\n")
 }}}

 Cheers! -Damian

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3135>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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