[tor-bugs] #16244 [Tor]: (Sandbox) Unexpected syscalls on relay

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#16244: (Sandbox) Unexpected syscalls on relay
-----------------------------------+------------------------------------
 Reporter:  asn                    |          Owner:
     Type:  defect                 |         Status:  new
 Priority:  normal                 |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor                    |        Version:
 Keywords:  tor-sandbox tor-relay  |  Actual Points:
Parent ID:                         |         Points:
-----------------------------------+------------------------------------
 weasel reported the following sandxbox warnings on his relay:
 {{{
 (Sandbox) Caught a bad syscall attempt (syscall eventfd2)
 /usr/bin/tor(+0x1328b6)[0x7f71180d18b6]
 /lib/x86_64-linux-gnu/libc.so.6(eventfd+0xd)[0x7f711649e2fd]
 /lib/x86_64-linux-gnu/libc.so.6(eventfd+0xd)[0x7f711649e2fd]
 /usr/bin/tor(alert_sockets_create+0xec)[0x7f71180bef9c]
 }}}

 {{{
  (Sandbox) Caught a bad syscall attempt (syscall open)
  /usr/bin/tor(+0x1328b6)[0x7f653db158b6]
  /lib/x86_64-linux-gnu/libpthread.so.0(open64+0x10)[0x7f653c3b81d0]
  /lib/x86_64-linux-gnu/libpthread.so.0(open64+0x10)[0x7f653c3b81d0]
  /usr/bin/tor(tor_open_cloexec+0x40)[0x7f653daff5e0]
  /usr/bin/tor(start_writing_to_file+0xf2)[0x7f653db10732]
  /usr/bin/tor(+0x12d89b)[0x7f653db1089b]
  /usr/bin/tor(+0x12d9e8)[0x7f653db109e8]
 /usr/bin/tor(crypto_pk_write_private_key_to_filename+0xcb)[0x7f653db1f57b]
 }}}

 We should probably test the sandbox more thoroughly on relay-mode.
 Here is the torrc used (to reproduce this):
 {{{
 Sandbox 1
 PublishServerDescriptor 0
 OrPort 9031
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16244>
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