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Retrieve the command line arguments from the fuzzer and save them for
later retrieval by `BasicTestingSetup` so that we gain extra flexibility
of passing any config options on the test command line, e.g.:
```
FUZZ=addrman ./src/test/fuzz/fuzz --checkaddrman=5
```
A fuzz test should call `MakeNoLogFileContext<>()` in its initialize
function in order to invoke the constructor of `BasicTestingSetup`,
which sets `gArgs`.
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- Google's repo
- Our report
- John's advice on fuzz-friendly development
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6e1150ea3b82d1ab557d4b74aa652b8d974876aa fuzz: add guide to fuzzing with Eclipser v1.x (Alex Groce)
Pull request description:
MarcoFalke and practicalswift here's an Eclipser guide, reconstructed from their documentation and my docker history getting it up and running. It might be good if someone confirmed it actually works for them in a fresh ubuntu 20.04.
ACKs for top commit:
practicalswift:
ACK 6e1150ea3b82d1ab557d4b74aa652b8d974876aa
Tree-SHA512: ca855932fd7a2c1d1005d572ab5fabc26f42d779f9baf279783f08a43dd72ec60f57239135d30c2a82781e593626fec2c96bb19fb91e1b777cef2d83a54eba35
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and add/improve a few headers
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Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
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Honggfuzz NetDriver
fd0be92cff6a4b5e343e6ddae7481868354b9869 doc: Add instructions on how to fuzz the P2P layer using Honggfuzz NetDriver (practicalswift)
Pull request description:
Add instructions on how to fuzz the P2P layer using [Honggfuzz NetDriver](http://blog.swiecki.net/2018/01/fuzzing-tcp-servers.html).
Honggfuzz NetDriver allows for very easy fuzzing of TCP servers such as Bitcoin Core without having to write any custom fuzzing harness. The `bitcoind` server process is largely fuzzed without modification.
This makes the fuzzing highly realistic: a bug reachable by the fuzzer is likely also remotely triggerable by an untrusted peer.
Top commit has no ACKs.
Tree-SHA512: 9e98cb30f00664c00c8ff9fd224ff9822bff3fd849652172df48dbaeade1dd1a5fc67ae53203f1966a1d4210671b35656009a2d8b84affccf3ddf1fd86124f6e
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This commit includes a short comment in doc/fuzzing.md that gives
guidance on compiling Bitcoin Core with AFL instrumentation using
afl-gcc and afl-g++.
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Fuzzing code uses C++17 specific code (e.g. std::optional), so it is not
possible to compile with --enable-fuzz and without --enable-c++17.
Thus, turn on --enable-c++17 whenever --enable-fuzz is used.
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instructions.
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Enable the `afl-clang-fast++` features deferred forkserver (`__AFL_INIT`) and persistent mode (`__AFL_LOOP(1000)`).
Before this patch:
```
$ afl-fuzz -i input -o output -m512 -- src/test/test_bitcoin_fuzzy
[*] Validating target binary...
[!] WARNING: The target binary is pretty slow! See /usr/local/share/doc/afl/perf_tips.txt.
[+] Here are some useful stats:
Test case count : 1 favored, 0 variable, 1 total
Bitmap range : 1072 to 1072 bits (average: 1072.00 bits)
Exec timing : 20.4k to 20.4k us (average: 20.4k us)
…
exec speed : 57.58/sec (slow!)
exec speed : 48.35/sec (slow!)
exec speed : 53.78/sec (slow!)
```
After this patch:
```
$ afl-fuzz -i input -o output -m512 -- src/test/test_bitcoin_fuzzy
[*] Validating target binary...
[+] Persistent mode binary detected.
[+] Deferred forkserver binary detected.
[+] Here are some useful stats:
Test case count : 1 favored, 0 variable, 1 total
Bitmap range : 24 to 24 bits (average: 24.00 bits)
Exec timing : 114 to 114 us (average: 114 us)
…
exec speed : 15.9k/sec
exec speed : 13.1k/sec
exec speed : 15.1k/sec
```
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