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46 lines
2.6 KiB
Markdown
46 lines
2.6 KiB
Markdown
## Fuzzers
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To run a fuzzer locally, you need [go-fuzz](https://github.com/dvyukov/go-fuzz) installed.
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First build a fuzzing-binary out of the selected package:
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```
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(cd ./rlp && CGO_ENABLED=0 go-fuzz-build .)
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```
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That command should generate a `rlp-fuzz.zip` in the `rlp/` directory. If you are already in that directory, you can do
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```
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[user@work rlp]$ go-fuzz
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2019/11/26 13:36:54 workers: 6, corpus: 3 (3s ago), crashers: 0, restarts: 1/0, execs: 0 (0/sec), cover: 0, uptime: 3s
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2019/11/26 13:36:57 workers: 6, corpus: 3 (6s ago), crashers: 0, restarts: 1/0, execs: 0 (0/sec), cover: 1054, uptime: 6s
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2019/11/26 13:37:00 workers: 6, corpus: 3 (9s ago), crashers: 0, restarts: 1/8358, execs: 25074 (2786/sec), cover: 1054, uptime: 9s
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2019/11/26 13:37:03 workers: 6, corpus: 3 (12s ago), crashers: 0, restarts: 1/8497, execs: 50986 (4249/sec), cover: 1054, uptime: 12s
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2019/11/26 13:37:06 workers: 6, corpus: 3 (15s ago), crashers: 0, restarts: 1/9330, execs: 74640 (4976/sec), cover: 1054, uptime: 15s
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2019/11/26 13:37:09 workers: 6, corpus: 3 (18s ago), crashers: 0, restarts: 1/9948, execs: 99482 (5527/sec), cover: 1054, uptime: 18s
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2019/11/26 13:37:12 workers: 6, corpus: 3 (21s ago), crashers: 0, restarts: 1/9428, execs: 122568 (5836/sec), cover: 1054, uptime: 21s
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2019/11/26 13:37:15 workers: 6, corpus: 3 (24s ago), crashers: 0, restarts: 1/9676, execs: 145152 (6048/sec), cover: 1054, uptime: 24s
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2019/11/26 13:37:18 workers: 6, corpus: 3 (27s ago), crashers: 0, restarts: 1/9855, execs: 167538 (6205/sec), cover: 1054, uptime: 27s
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2019/11/26 13:37:21 workers: 6, corpus: 3 (30s ago), crashers: 0, restarts: 1/9645, execs: 192901 (6430/sec), cover: 1054, uptime: 30s
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2019/11/26 13:37:24 workers: 6, corpus: 3 (33s ago), crashers: 0, restarts: 1/9967, execs: 219294 (6645/sec), cover: 1054, uptime: 33s
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```
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Otherwise:
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```
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go-fuzz -bin ./rlp/rlp-fuzz.zip
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```
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### Notes
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Once a 'crasher' is found, the fuzzer tries to avoid reporting the same vector twice, so stores the fault in the `suppressions` folder. Thus, if you
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e.g. make changes to fix a bug, you should _remove_ all data from the `suppressions`-folder, to verify that the issue is indeed resolved.
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Also, if you have only one and the same exit-point for multiple different types of test, the suppression can make the fuzzer hide differnent types of errors. So make
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sure that each type of failure is unique (for an example, see the rlp fuzzer, where a counter `i` is used to differentiate between failures:
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```golang
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if !bytes.Equal(input, output) {
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panic(fmt.Sprintf("case %d: encode-decode is not equal, \ninput : %x\noutput: %x", i, input, output))
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}
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```
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