[tor-bugs] #31375 [Core Tor/Tor]: hs: Crasg in token_bucket_ctr_refill() of the INTRO2 DoS defense

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#31375: hs: Crasg in token_bucket_ctr_refill() of the INTRO2 DoS defense
--------------------------------+--------------------------------
     Reporter:  dgoulet         |      Owner:  (none)
         Type:  defect          |     Status:  new
     Priority:  Very High       |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  tor-hs, crash
Actual Points:                  |  Parent ID:
       Points:                  |   Reviewer:
      Sponsor:  Sponsor27-must  |
--------------------------------+--------------------------------
 Ran my relay for some minutes with master (merged #15516) and the HS DoS
 defenses enabled. Relay died with this:

 {{{
 Tor 0.4.2.0-alpha-dev (git-0acfd7dcee2a4473) died: Caught signal 8
 /home/tor/git/tor/src/app/tor(+0x20d359)[0x5594030b1359]
 /home/tor/git/tor/src/app/tor(token_bucket_ctr_refill+0x3b)[0x55940304c33b]
 /home/tor/git/tor/src/app/tor(token_bucket_ctr_refill+0x3b)[0x55940304c33b]
 /home/tor/git/tor/src/app/tor(hs_dos_can_send_intro2+0x45)[0x559402fb6ba5]
 /home/tor/git/tor/src/app/tor(rend_mid_introduce_legacy+0x136)[0x559402ff7096]
 /home/tor/git/tor/src/app/tor(hs_intro_received_introduce1+0x2ce)[0x5594030457ee]
 /home/tor/git/tor/src/app/tor(rend_process_relay_cell+0x1bf)[0x559402ff643f]
 /home/tor/git/tor/src/app/tor(+0xb9105)[0x559402f5d105]
 /home/tor/git/tor/src/app/tor(+0xb9b60)[0x559402f5db60]
 /home/tor/git/tor/src/app/tor(circuit_receive_relay_cell+0x490)[0x559402f5f590]
 /home/tor/git/tor/src/app/tor(command_process_cell+0x3f8)[0x559402f40ed8]
 /home/tor/git/tor/src/app/tor(channel_tls_handle_cell+0x39b)[0x559402f2078b]
 /home/tor/git/tor/src/app/tor(+0xa5a9c)[0x559402f49a9c]
 /home/tor/git/tor/src/app/tor(connection_handle_read+0xa0d)[0x559402f0dd0d]
 /home/tor/git/tor/src/app/tor(+0x6ef1e)[0x559402f12f1e]
 /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x1e8f8)[0x7f15b29208f8]
 /usr/lib/x86_64-linux-
 gnu/libevent-2.1.so.6(event_base_loop+0x53f)[0x7f15b292133f]
 /home/tor/git/tor/src/app/tor(do_main_loop+0xd9)[0x559402f14209]
 /home/tor/git/tor/src/app/tor(tor_run_main+0x128d)[0x559402f01d9d]
 /home/tor/git/tor/src/app/tor(tor_main+0x3a)[0x559402eff1da]
 /home/tor/git/tor/src/app/tor(main+0x19)[0x559402efed69]
 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f15b1bbbb97]
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31375>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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