[tor-bugs] #20003 [Core Tor/Tor]: Sandbox causing crash when setting HidServAuth

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#20003: Sandbox causing crash when setting HidServAuth
------------------------------+--------------------------
     Reporter:  segfault      |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.7.6
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------
 I'm working on Tails Server and I'm currently implementing client
 authentication for it. When I use SETCONF to set the HidServAuth, or set
 it in the torrc and reload Tor, Tor crashes with this error message:

 {{{
 ============================================================ T= 1472233872
 (Sandbox) Caught a bad syscall attempt (syscall chmod)
 /usr/bin/tor(+0x13d8bc)[0xf76a28bc]
 /lib/i386-linux-gnu/libc.so.6(chmod+0x11)[0xf7141361]
 /lib/i386-linux-gnu/libc.so.6(chmod+0x11)[0xf7141361]
 /usr/bin/tor(+0x583bf)[0xf75bd3bf]
 /usr/bin/tor(rend_service_load_all_keys+0x7f)[0xf75bf21f]
 /usr/bin/tor(set_options+0xcc1)[0xf762d1f1]
 /usr/bin/tor(options_trial_assign+0xc4)[0xf762e8c4]
 /usr/bin/tor(+0xe7c83)[0xf764cc83]
 /usr/bin/tor(connection_control_process_inbuf+0x981)[0xf76509f1]
 /usr/bin/tor(+0xcecdd)[0xf7633cdd]
 /usr/bin/tor(+0xd75a8)[0xf763c5a8]
 /usr/bin/tor(+0x2f0a9)[0xf75940a9]
 /usr/lib/i386-linux-
 gnu/libevent-2.0.so.5(event_base_loop+0x73d)[0xf748136d]
 /usr/bin/tor(do_main_loop+0x27d)[0xf7594b0d]
 /usr/bin/tor(tor_main+0x176d)[0xf7598a8d]
 /usr/bin/tor(main+0x35)[0xf7591b35]
 /lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xf7092723]
 /usr/bin/tor(+0x2cb94)[0xf7591b94]
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20003>
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