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[tor-bugs] #3393 [Tor Client]: ControlSocketsGroupWritable option is not compatible with User

#3393: ControlSocketsGroupWritable option is not compatible with User
------------------------+---------------------------------------------------
 Reporter:  lunar       |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  normal      |      Milestone:                    
Component:  Tor Client  |        Version:  Tor: 0.2.2.26-beta
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
------------------------+---------------------------------------------------
 `check_private_dir()` to ensure that `ControlSocketsGroupWritable` is safe
 to use. Unfortunately, `check_private_dir()` only checks against the
 currently running userâ which can be root until privileges are dropped to
 the user and group configured by the `User` config option.

 The attached patch fixes the issue by adding a new `effective_user`
 argument to `check_private_dir()` and updating the callers. It might not
 be the best way to fix the issue, but it did in my tests.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3393>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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