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Merge #20437: fuzz: Avoid time-based "non-determinism" in fuzzing harnesses by using mocked GetTime()

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8c09c0c1d18885ef94f79b3f2d073f43269bc95d fuzz: Avoid time-based "non-determinism" in fuzzing harnesses by using mocked GetTime() (practicalswift)

Pull request description:

  Avoid time-based "non-determinism" in fuzzing harnesses by using mocked `GetTime()`.

  Prior to this commit the fuzzing harnesses `banman`, `connman`, `net` and `rbf` had time-based "non-determinism". `addrman` is fixed in #20425. `process_message` and `process_messages` are left to fix: simply using mock time is not enough for them due to interaction with `IsInitialBlockDownload()`.

  See [`doc/fuzzing.md`](https://github.com/bitcoin/bitcoin/blob/master/doc/fuzzing.md) for information on how to fuzz Bitcoin Core. Don't forget to contribute any coverage increasing inputs you find to the [Bitcoin Core fuzzing corpus repo](https://github.com/bitcoin-core/qa-assets).

  Happy fuzzing :)

ACKs for top commit:
  MarcoFalke:
    review ACK 8c09c0c1d18885ef94f79b3f2d073f43269bc95d
  practicalswift:
    > review ACK [8c09c0c](8c09c0c1d1)

Tree-SHA512: 32dfbead3dfd18cf4ff56dc2ea341aa977441b4e19a54879cf54fa5820c7e2b14b92c7e238d32fd785654f3b28cc82826ae66c03e94c292633c63c41196ba9a8
This commit is contained in:
MarcoFalke 2020-12-15 17:11:49 +01:00 committed by PastaPastaPasta
parent 4cf7374c04
commit 31875f5d2d
3 changed files with 3 additions and 0 deletions
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1
src/test/fuzz/banman.cpp
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@ -36,6 +36,7 @@ FUZZ_TARGET_INIT(banman, initialize_banman)
// complexity of the input size). // complexity of the input size).
int limit_max_ops{300}; int limit_max_ops{300};
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
SetMockTime(ConsumeTime(fuzzed_data_provider));
const fs::path banlist_file = GetDataDir() / "fuzzed_banlist.dat"; const fs::path banlist_file = GetDataDir() / "fuzzed_banlist.dat";
fs::remove(banlist_file); fs::remove(banlist_file);
{ {

1
src/test/fuzz/connman.cpp
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@ -23,6 +23,7 @@ void initialize_connman()
FUZZ_TARGET_INIT(connman, initialize_connman) FUZZ_TARGET_INIT(connman, initialize_connman)
{ {
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
SetMockTime(ConsumeTime(fuzzed_data_provider));
CAddrMan addrman; CAddrMan addrman;
CConnman connman{fuzzed_data_provider.ConsumeIntegral<uint64_t>(), fuzzed_data_provider.ConsumeIntegral<uint64_t>(), addrman}; CConnman connman{fuzzed_data_provider.ConsumeIntegral<uint64_t>(), fuzzed_data_provider.ConsumeIntegral<uint64_t>(), addrman};
CNetAddr random_netaddr; CNetAddr random_netaddr;

1
src/test/fuzz/net.cpp
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@ -30,6 +30,7 @@ FUZZ_TARGET_INIT(net, initialize_net)
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size()); FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
CNode node{ConsumeNode(fuzzed_data_provider)}; CNode node{ConsumeNode(fuzzed_data_provider)};
SetMockTime(ConsumeTime(fuzzed_data_provider));
while (fuzzed_data_provider.ConsumeBool()) { while (fuzzed_data_provider.ConsumeBool()) {
CallOneOf( CallOneOf(
fuzzed_data_provider, fuzzed_data_provider,