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fuzz: Abort when global PRNG is used before SeedRand::ZEROS

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This commit is contained in:
MarcoFalke
2024-12-20 16:15:32 +01:00
parent 433412fd84
commit fa3c787b62
3 changed files with 10 additions and 6 deletions
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8
src/test/util/random.cpp
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@@ -1,4 +1,4 @@
// Copyright (c) 2023 The Bitcoin Core developers
// Copyright (c) 2023-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -24,7 +24,8 @@ void SeedRandomStateForTest(SeedRand seedtype)
// MakeRandDeterministicDANGEROUS is called, the output of GetRandHash is
// no longer truly random. It should be enough to get the seed once for the
// process.
static const uint256 ctx_seed = []() {
static const auto g_ctx_seed = []() -> std::optional<uint256> {
if constexpr (G_FUZZING) return {};
// If RANDOM_CTX_SEED is set, use that as seed.
if (const char* num{std::getenv(RANDOM_CTX_SEED)}) {
if (auto num_parsed{uint256::FromUserHex(num)}) {
@@ -41,8 +42,9 @@ void SeedRandomStateForTest(SeedRand seedtype)
g_seeded_g_prng_zero = seedtype == SeedRand::ZEROS;
if constexpr (G_FUZZING) {
Assert(g_seeded_g_prng_zero); // Only SeedRandomStateForTest(SeedRand::ZEROS) is allowed in fuzz tests
Assert(!g_used_g_prng); // The global PRNG must not have been used before SeedRandomStateForTest(SeedRand::ZEROS)
}
const uint256& seed{seedtype == SeedRand::FIXED_SEED ? ctx_seed : uint256::ZERO};
const uint256& seed{seedtype == SeedRand::FIXED_SEED ? g_ctx_seed.value() : uint256::ZERO};
LogInfo("Setting random seed for current tests to %s=%s\n", RANDOM_CTX_SEED, seed.GetHex());
MakeRandDeterministicDANGEROUS(seed);
}