Add fuzzing harnesses #18431

1. 
   MarcoFalke commented at 8:15 pm on March 25, 2020: member

   Adding fuzz tests is a low hanging fruit. This is an open ended issue.

   See previously contributed fuzz tests: https://github.com/bitcoin/bitcoin/pulls?q=is%3Apr+label%3ATests+is%3Aclosed+fuzz See missing fuzz coverage: https://marcofalke.github.io/btc_cov/fuzz.coverage/index.html

   Useful skills:

   • Basic fuzzing background, see the quickstart guide: https://github.com/bitcoin/bitcoin/blob/master/doc/fuzzing.md#fuzzing-bitcoin-core-using-libfuzzer
   • Basic C++ knowledge

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2. MarcoFalke added the label Tests on Mar 25, 2020
3. MarcoFalke added the label good first issue on Mar 25, 2020
4. 
   pierreN commented at 10:33 am on March 27, 2020: contributor

   I’d like to help on this, could by any chance anyone pinpoint a nice harness to write to start with (maybe @practicalswift since you seem to do a lot of fuzzing?) ? Thanks
5. 
   MarcoFalke commented at 6:13 pm on March 28, 2020: member

   The fuzz target can literally be anything. You can use as much creativity as you want.

   It can be a simple target like the constructor of CMessageHeader(1,2,3) (c.f. #16995), the class CMerkleBlock, or advanced stateful classes like the mempool (tx acceptance and graph) or most validation datastructures (coins db, block header tree, …).

6. fanquake deleted a comment on Apr 2, 2020
7. MarcoFalke closed this on Mar 18, 2021

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8. DrahtBot locked this on Aug 18, 2022

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