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fuzz: make FuzzedDataProvider usage deterministic

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There exist many usages of `fuzzed_data_provider` where it is evaluated directly in the function call.
Unfortunately, the order of evaluation of function arguments is unspecified. This means it can differ
between compilers/version/optimization levels etc. But when the evaluation order changes, the same
fuzzing input will produce different output, which is bad for coverage/reproducibility.

This PR fixes all these cases where by moving multiple calls to `fuzzed_data_provider` out of the
function arguments.
This commit is contained in:
Martin Leitner-Ankerl 2023-12-09 13:19:02 +01:00
parent 3e691258d8
commit 01960c53c7
18 changed files with 129 additions and 66 deletions
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9
src/test/fuzz/script_sign.cpp
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@ -111,7 +111,10 @@ FUZZ_TARGET(script_sign, .init = initialize_script_sign)
}
if (n_in < script_tx_to.vin.size()) {
SignatureData empty;
(void)SignSignature(provider, ConsumeScript(fuzzed_data_provider), script_tx_to, n_in, ConsumeMoney(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<int>(), empty);
auto from_pub_key = ConsumeScript(fuzzed_data_provider);
auto amount = ConsumeMoney(fuzzed_data_provider);
auto n_hash_type = fuzzed_data_provider.ConsumeIntegral<int>();
(void)SignSignature(provider, from_pub_key, script_tx_to, n_in, amount, n_hash_type, empty);
MutableTransactionSignatureCreator signature_creator{tx_to, n_in, ConsumeMoney(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<int>()};
std::vector<unsigned char> vch_sig;
CKeyID address;
@ -122,7 +125,9 @@ FUZZ_TARGET(script_sign, .init = initialize_script_sign)
} else {
address = CKeyID{ConsumeUInt160(fuzzed_data_provider)};
}
(void)signature_creator.CreateSig(provider, vch_sig, address, ConsumeScript(fuzzed_data_provider), fuzzed_data_provider.PickValueInArray({SigVersion::BASE, SigVersion::WITNESS_V0}));
auto script_code = ConsumeScript(fuzzed_data_provider);
auto sigversion = fuzzed_data_provider.PickValueInArray({SigVersion::BASE, SigVersion::WITNESS_V0});
(void)signature_creator.CreateSig(provider, vch_sig, address, script_code, sigversion);
}
std::map<COutPoint, Coin> coins{ConsumeCoins(fuzzed_data_provider)};
std::map<int, bilingual_str> input_errors;