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Merge bitcoin/bitcoin#30661: fuzz: Test headers pre-sync through p2p

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a97f43d63a fuzz: Add harness for p2p headers sync (marcofleon)
a0eaa4749f Add FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION in PoW check (marcofleon)
a3f6f5acd8 build: Automatically define FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION for fuzz builds (marcofleon)
0c02d4b2bd net_processing: Make MAX_HEADERS_RESULTS a PeerManager option (marcofleon)

Pull request description:

  This PR reopens https://github.com/bitcoin/bitcoin/pull/28043. It's a regression fuzz test for https://github.com/bitcoin/bitcoin/pull/26355 and [a couple bugs](ed6cddd98e) that were addressed in https://github.com/bitcoin/bitcoin/pull/25717. This should help us move forward with the [removal of mainnet checkpoints](https://github.com/bitcoin/bitcoin/pull/25725).

  It seems like the main concern in https://github.com/bitcoin/bitcoin/pull/28043 was the global mock function for proof of work. This PR aims to be an improvement by replacing the previous approach with a fuzz build configured using `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION`. This ensures that the simplified test code will never be in a release binary. If we agree this is the way to go, there are some other places (for future targets) where this method could be used.

  In this target, PoW isn't being tested, so the goal is to bypass the check and let the fuzzer do its thing. In the other harnesses where PoW is actually being fuzzed, `CheckProofOfWork` is now `CheckProofOfWorkImpl`. So, the only change to that function is in the name.

  More about `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` can be found at https://llvm.org/docs/LibFuzzer.html#fuzzer-friendly-build-mode and https://github.com/AFLplusplus/AFLplusplus/blob/stable/docs/fuzzing_in_depth.md#d-modifying-the-target.

ACKs for top commit:
  naumenkogs:
    ACK a97f43d63a
  dergoegge:
    reACK a97f43d63a
  instagibbs:
    tested ACK a97f43d63a
  brunoerg:
    ACK a97f43d63a

Tree-SHA512: 60b0bc6aadd8ca4c39db9cbba2da2debaaf68afcb6a8dd75c1ce48ca9e3996948fda8020930b6771a424e0f7c41b0b1068db4aa7dbe517f8fc152f1f712058ad
This commit is contained in:
glozow
2024-09-16 13:42:29 -04:00
parent c38e9993de a97f43d63a
commit 2bf721e76a
9 changed files with 227 additions and 11 deletions
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2
src/test/fuzz/integer.cpp
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@@ -69,7 +69,7 @@ FUZZ_TARGET(integer, .init = initialize_integer)
const bool b = fuzzed_data_provider.ConsumeBool();
const Consensus::Params& consensus_params = Params().GetConsensus();
(void)CheckProofOfWork(u256, u32, consensus_params);
(void)CheckProofOfWorkImpl(u256, u32, consensus_params);
if (u64 <= MAX_MONEY) {
const uint64_t compressed_money_amount = CompressAmount(u64);
assert(u64 == DecompressAmount(compressed_money_amount));