From: Lawrence Stewart <stewart@serissa.com>
To: Larry McVoy <lm@mcvoy.com>
Cc: TUHS main list <tuhs@tuhs.org>
Subject: [TUHS] Re: A fuzzy awk.
Date: Mon, 20 May 2024 22:54:36 -0400 [thread overview]
Message-ID: <BFB0C596-76F7-4807-9797-8056C0E01BE0@serissa.com> (raw)
In-Reply-To: <20240521024743.GE25728@mcvoy.com>
Good to learn more of the history! I wonder when the technique got started on the hardware side?
I wouldn’t be surprised if IBM were doing some of this for the S/360 since it was a nearly
compatible set of systems.
-L
> On May 20, 2024, at 10:47 PM, Larry McVoy <lm@mcvoy.com> wrote:
>
> I think the title might go to my OS prof, Bart Miller. He did a paper
>
> https://www.paradyn.org/papers/fuzz.pdf
>
> that named it that in 1990.
>
> On Tue, May 21, 2024 at 11:56:30AM +1000, Rob Pike wrote:
>> Ron Hardin was doing this to Dennis's C compiler in the 1980s, well before
>> 1998. And I believe Doug McIlroy was generating random regular expressions
>> to compare different implementations. It's probably impossible to decide
>> who invented fuzzing, so the credit will surely go to the person who named
>> it.
>>
>> -rob
>>
>>
>> On Tue, May 21, 2024 at 12:09???AM Serissa <stewart@serissa.com> wrote:
>>
>>> Well this is obviously a hot button topic. AFAIK I was nearby when
>>> fuzz-testing for software was invented. I was the main advocate for hiring
>>> Andy Payne into the Digital Cambridge Research Lab. One of his little
>>> projects was a thing that generated random but correct C programs and fed
>>> them to different compilers or compilers with different switches to see if
>>> they crashed or generated incorrect results. Overnight, his tester filed
>>> 300 or so bug reports against the Digital C compiler. This was met with
>>> substantial pushback, but it was a mostly an issue that many of the reports
>>> traced to the same underlying bugs.
>>>
>>> Bill McKeemon expanded the technique and published "Differential Testing
>>> of Software"
>>> https://www.cs.swarthmore.edu/~bylvisa1/cs97/f13/Papers/DifferentialTestingForSoftware.pdf
>>>
>>> Andy had encountered the underlying idea while working as an intern on the
>>> Alpha processor development team. Among many other testers, they used an
>>> architectural tester called REX to generate more or less random sequences
>>> of instructions, which were then run through different simulation chains
>>> (functional, RTL, cycle-accurate) to see if they did the same thing.
>>> Finding user-accessible bugs in hardware seems like a good thing.
>>>
>>> The point of generating correct programs (mentioned under the term LangSec
>>> here) goes a long way to avoid irritating the maintainers. Making the test
>>> cases short is also maintainer-friendly. The test generator is also in a
>>> position to annotate the source with exactly what it is supposed to do,
>>> which is also helpful.
>>>
>>> -L
>>>
>>>
>>>
>
> --
> ---
> Larry McVoy Retired to fishing http://www.mcvoy.com/lm/boat
next prev parent reply other threads:[~2024-05-21 2:54 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-20 14:09 Serissa
2024-05-21 1:56 ` Rob Pike
2024-05-21 2:47 ` Larry McVoy
2024-05-21 2:54 ` Lawrence Stewart [this message]
2024-05-21 3:36 ` Rob Pike
2024-05-21 11:59 ` Peter Weinberger (温博格) via TUHS
2024-05-21 3:53 ` George Michaelson
2024-05-21 16:59 ` Paul Winalski
2024-05-21 17:56 ` segaloco via TUHS
2024-05-21 18:12 ` Luther Johnson
2024-05-22 15:37 ` Paul Winalski
2024-05-22 18:49 ` Larry McVoy
2024-05-22 20:17 ` Larry McVoy
2024-05-22 3:26 ` Dave Horsfall
2024-05-22 5:08 ` Alexis
2024-05-22 13:12 ` Warner Losh
-- strict thread matches above, loose matches on Subject: below --
2024-05-23 13:49 Douglas McIlroy
2024-05-23 20:52 ` Rob Pike
2024-05-24 5:41 ` andrew
2024-05-24 7:17 ` Ralph Corderoy
2024-05-24 7:41 ` Rob Pike
2024-05-24 11:56 ` Dan Halbert
2024-05-25 0:17 ` Bakul Shah via TUHS
2024-05-25 0:57 ` G. Branden Robinson
2024-05-25 13:56 ` David Arnold
2024-05-25 17:18 ` Paul Winalski
2024-05-25 17:36 ` Tom Perrine
2024-05-20 13:06 [TUHS] A fuzzy awk. (Was: The 'usage: ...' message.) Douglas McIlroy
2024-05-20 13:25 ` [TUHS] " Chet Ramey
2024-05-20 13:41 ` [TUHS] Re: A fuzzy awk Ralph Corderoy
2024-05-20 14:26 ` Chet Ramey
2024-05-22 13:44 ` arnold
2024-05-20 13:54 ` Ralph Corderoy
2024-05-19 23:08 [TUHS] The 'usage: ...' message. (Was: On Bloat...) Douglas McIlroy
2024-05-20 0:58 ` [TUHS] " Rob Pike
2024-05-20 3:19 ` arnold
2024-05-20 9:20 ` [TUHS] A fuzzy awk. (Was: The 'usage: ...' message.) Ralph Corderoy
2024-05-20 13:10 ` [TUHS] " Chet Ramey
2024-05-20 13:30 ` [TUHS] Re: A fuzzy awk Ralph Corderoy
2024-05-20 13:48 ` Chet Ramey
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