[tor-bugs] #18089 [Tor]: Tor compiled with --enable-expensive-hardening leads to runtime errors (null pointer passing)

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#18089: Tor compiled with --enable-expensive-hardening leads to runtime errors
(null pointer passing)
------------------------+--------------------------
     Reporter:  gk      |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:
    Component:  Tor     |    Version:  Tor: 0.2.7.6
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
------------------------+--------------------------
 {{{
 ../src/common/crypto.c:2596:3: runtime error: null pointer passed as
 argument 1, which is declared to never be null
 }}}
 Immediately following I get
 {{{
 /usr/include/x86_64-linux-gnu/bits/string3.h:90:10: runtime error: null
 pointer passed as argument 1, which is declared to never be null
 }}}
 Line 90 in my string3.h is:
 {{{
 return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
 }}}

 Steps to reproduce:
 1) Get the latest hardened Tor Browser (the same issue happens with a
 stable Tor Browser + a self-compiled hardened Tor)
 2) Start it with `./start-tor-browser.desktop --debug --log` and don't
 connect directly but use a pluggable transport; just using the default one
 is enough, there is no need to enter bridges manually
 3) You should see the above messages in your terminal/tor-browser.log file

 FWIW connecting directly does not trigger this issue.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18089>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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