[tor-bugs] #24454 [Core Tor/Tor]: sandbox failure on arm64

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#24454: sandbox failure on arm64
------------------------------+--------------------------------
     Reporter:  weasel        |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.2.5-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 With #24424 fixed, Tor builds but it still does not run:

 {{{
 $ ./src/or/tor Sandbox 1
 Nov 28 08:35:29.521 [notice] Tor 0.3.2.5-alpha (git-d499a5a708f7298b)
 running on Linux with Libevent 2.1.8-stable, OpenSSL 1.1.0g, Zlib 1.2.8,
 Liblzma 5.2.2, and Libzstd 1.3.2.
 Nov 28 08:35:29.521 [notice] Tor can't help you if you use it wrong! Learn
 how to be safe at https://www.torproject.org/download/download#warning
 Nov 28 08:35:29.521 [notice] This version is not a stable Tor release.
 Expect more bugs than usual.
 Nov 28 08:35:29.521 [notice] Configuration file "/usr/local/etc/tor/torrc"
 not present, using reasonable defaults.
 Nov 28 08:35:29.525 [notice] Scheduler type KIST has been enabled.
 Nov 28 08:35:29.525 [notice] Opening Socks listener on 127.0.0.1:9050
 Nov 28 08:35:30.000 [notice] Bootstrapped 0%: Starting

 ============================================================ T= 1511858130
 (Sandbox) Caught a bad syscall attempt (syscall unlinkat)
 ./src/or/tor(+0x1aa4ac)[0xaaaaccfd54ac]
 linux-vdso.so.1(__kernel_rt_sigreturn+0x0)[0xffff8806e6c0]
 /lib/aarch64-linux-gnu/libc.so.6(unlink+0x14)[0xffff87a4953c]
 }}}

 under strace:
 {{{
 $ strace -f ./src/or/tor DisableDebuggerAttachment 0 Sandbox 1
 [...]
 getpid()                                = 25468
 getpid()                                = 25468
 write(1, "Nov 28 08:36:05.000 [notice] Boo"..., 55Nov 28 08:36:05.000
 [notice] Bootstrapped 0%: Starting
 ) = 55
 unlinkat(AT_FDCWD, "/home/weasel/.tor/key-pinning-entries", 0) = -1
 ENETDOWN (Network is down)
 --- SIGSYS {si_signo=SIGSYS, si_code=SYS_SECCOMP,
 si_call_addr=0xffffa45d253c, si_syscall=__NR_unlinkat,
 si_arch=AUDIT_ARCH_AARCH64} ---
 write(1, "\n==============================="..., 64
 ============================================================ T=) = 64
 write(1, " 1511858165", 11 1511858165)             = 11
 write(1, "\n", 1
 )                       = 1
 write(1, "(Sandbox) Caught a bad syscall a"..., 48(Sandbox) Caught a bad
 syscall attempt (syscall ) = 48
 [..]
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24454>
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