tests: Add fuzzing harness for AS-mapping (asmap) #18029

pull practicalswift wants to merge 2 commits into bitcoin:master from practicalswift:fuzzers-asmap changing 4 files +36 −1

practicalswift commented at 4:11 PM on January 30, 2020: contributor

Add fuzzing harness for AS-mapping (asmap).

To test this PR:

$ make distclean
$ ./autogen.sh
$ CC=clang CXX=clang++ ./configure --enable-fuzz \
      --with-sanitizers=address,fuzzer,undefined
$ make
$ src/test/fuzz/asmap
…

tests: Add fuzzing harness for AS-mapping (asmap) 8d07706985
tests: Add fuzzer asmap to FUZZERS_MISSING_CORPORA (temporarily) 4d2aceaad8
DrahtBot added the label Build system on Jan 30, 2020
DrahtBot added the label P2P on Jan 30, 2020
DrahtBot added the label Tests on Jan 30, 2020
MarcoFalke commented at 5:15 PM on January 30, 2020: member

ACK 4d2aceaad8d28a54246b6639966e2278d2d795e3
MarcoFalke removed the label Build system on Jan 30, 2020
MarcoFalke removed the label P2P on Jan 30, 2020

in src/netaddress.h:42 in 4d2aceaad8

  38 | @@ -39,7 +39,6 @@ class CNetAddr
  39 |          explicit CNetAddr(const struct in_addr& ipv4Addr);
  40 |          void SetIP(const CNetAddr& ip);
  41 |  
  42 | -    private:

jonatack commented at 10:27 AM on February 1, 2020:

public: at line 48 now redundant, can be removed as well?

jonatack commented at 10:39 AM on February 1, 2020: member

ACK 4d2aceaad8d28a54246b6639966e2278d2d795e3

Code review, test. Fuzz output: https://gist.github.com/jonatack/5d78f682e0b245455192567d6af12b7e

PR #17812 adds test coverage as well (review beg).
jonatack commented at 6:16 AM on February 2, 2020: member
Tested #18023 for 18 hours and 72M execs with this fuzzer (before that patch it found a heap buffer overflow immediately, as shown in https://gist.github.com/jonatack/5d78f682e0b245455192567d6af12b7e):
```
[#72474660](/bitcoin-bitcoin/72474660/) REDUCE cov: 1198 ft: 3529 corp: 197/12792b exec/s: 1063 rss: 452Mb L: 41/1527 MS: 4 InsertByte-EraseBytes-InsertByte-PersAutoDict- DE: "\x00 \x00\x00\x00\x00\x00\x00"-
```
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