[tor-bugs] #12860 [Tor]: Couldn't format create cell warning can be triggered remotely for relayed cells

[Tor Bug Tracker Wiki]

#12860: Couldn't format create cell warning can be triggered remotely for 
relayed
cells
-+-
 Reporter:  cypherpunks  |  Owner:
 Type:  defect   | Status:  new
 Priority:  normal   |  Milestone:
Component:  Tor  |Version:
 Keywords:  tor-relay|  Actual Points:
Parent ID:   | Points:
-+-
 If relay process extent request then it can to fill logs by warnings about
 wrongly formatted create cells. It's easy to reproduce such cells and to
 trigger logs for relay.
 {{{
   if (r  0) {
 log_warn(LD_CIRC,Couldn't format create cell);
 return -1;
   }
 }}}
 It need lower logs level or rate limiting or LOG_PROTOCOL_WARN
 (preferable) for relayed cells.

--
Ticket URL: https://trac.torproject.org/projects/tor/ticket/12860
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Re: [tor-bugs] #12860 [Tor]: Couldn't format create cell warning can be triggered remotely for relayed cells

[Tor Bug Tracker Wiki]

#12860: Couldn't format create cell warning can be triggered remotely for 
relayed
cells
-+---
 Reporter:  cypherpunks  |  Owner:
 Type:  defect   | Status:  new
 Priority:  normal   |  Milestone:
Component:  Tor  |Version:
   Resolution:   |   Keywords:  tor-relay
Actual Points:   |  Parent ID:
   Points:   |
-+---

Comment (by cypherpunks):

 Unless it checked before by circuit_extend()
 {{{
   if (extend_cell_parse(ec, rh.command,
 cell-payload+RELAY_HEADER_SIZE,
 rh.length)  0) {
 log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
Can't parse extend cell. Closing circuit.);
 return -1;
   }
 }}}
 Then bug is invalid.

--
Ticket URL: https://trac.torproject.org/projects/tor/ticket/12860#comment:1
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Re: [tor-bugs] #12860 [Tor]: Couldn't format create cell warning can be triggered remotely for relayed cells

[Tor Bug Tracker Wiki]

#12860: Couldn't format create cell warning can be triggered remotely for 
relayed
cells
-+---
 Reporter:  cypherpunks  |  Owner:
 Type:  defect   | Status:  closed
 Priority:  normal   |  Milestone:
Component:  Tor  |Version:
   Resolution:  invalid  |   Keywords:  tor-relay
Actual Points:   |  Parent ID:
   Points:   |
-+---
Changes (by cypherpunks):

 * status:  new = closed
 * resolution:   = invalid


Comment:

 Seems so. Sorry. check_create_cell() called by extend_cell_parse() which
 is generates create cell.

--
Ticket URL: https://trac.torproject.org/projects/tor/ticket/12860#comment:2
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