[tor-bugs] #25841 [Core Tor/Tor]: Write test for Rust fragile hardening

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#25841: Write test for Rust fragile hardening
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     Reporter:  Hello71       |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #25386
       Points:                |   Reviewer:
      Sponsor:                |
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 We should write some tests to ensure that asan is working to check memory
 leaks, dangling pointers, and so on. I know that #25386 links asan, but I
 don't know if it actually checks stuff that we want checked. We should
 check that it checks what we want checked.

 I envision this looking like a `test_fragile_hardening.c` (or a series of
 such files) and some helper Rust code that does some bad behavior and a
 wrapper that ensures that it crashes.

 Landing this requires #25386, but writing it does not; just assume that
 Rust and C can arbitrarily call each other (with the proper boilerplate),
 and asan is supposed to catch everything that it catches in C.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25841>
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