[tor-bugs] #25440 [Core Tor/Tor]: Broken openat syscall in Sandbox mode

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Apr 16 22:44:27 UTC 2018


#25440: Broken openat syscall in Sandbox mode
-------------------------------------------------+-------------------------
 Reporter:  ageisp0lis                           |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.3-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  sandbox, 033-must, regression,       |  Actual Points:
  033-triage-20180326, 033-included-20180326     |
  033-backport, AffectsTails                     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by Jigsaw52):

 I believe I am experiencing the same issue, with the master branch, on
 Ubuntu 18.04 64bits, which uses libc 2.27.

 I can confirm the string is being interned correctly: I have checked the
 pointers on the sandbox initialization and on the failing syscall and they
 are the same.

 I have tor run under strace and greped for openat calls and noticed
 something: the openat call that kills tor has and extra argument which all
 the others do not.
 I believe the cause of this problem could be related to this.

 I have attached my logs and my orconfig.h file.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25440#comment:14>
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