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[fuzz] Add determinism fuzzing to simple & dictionary round trip

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Compress the input twice in the `simple_round_trip` and
`dictionary_round_trip` fuzzers with exactly the same parameters, but
reusing the context. Then ensure that the compressed output is
identical.
This commit is contained in:
Nick Terrell
2021-05-13 17:05:59 -07:00
parent 03c4111299
commit 725c5e4e38
4 changed files with 64 additions and 5 deletions
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tests/fuzz/simple_round_trip.c
+23 -3
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@@ -35,16 +35,36 @@ static size_t roundTripTest(void *result, size_t resultCapacity,
size_t dSize;
int targetCBlockSize = 0;
if (FUZZ_dataProducer_uint32Range(producer, 0, 1)) {
size_t const remainingBytes = FUZZ_dataProducer_remainingBytes(producer);
FUZZ_setRandomParameters(cctx, srcSize, producer);
cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
FUZZ_ZASSERT(cSize);
FUZZ_ZASSERT(ZSTD_CCtx_getParameter(cctx, ZSTD_c_targetCBlockSize, &targetCBlockSize));
// Compress a second time and check for determinism
{
size_t const cSize0 = cSize;
XXH64_hash_t const hash0 = XXH64(compressed, cSize, 0);
FUZZ_dataProducer_rollBack(producer, remainingBytes);
FUZZ_setRandomParameters(cctx, srcSize, producer);
cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
FUZZ_ASSERT(cSize == cSize0);
FUZZ_ASSERT(XXH64(compressed, cSize, 0) == hash0);
}
} else {
int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel);
int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel);
cSize = ZSTD_compressCCtx(
cctx, compressed, compressedCapacity, src, srcSize, cLevel);
FUZZ_ZASSERT(cSize);
// Compress a second time and check for determinism
{
size_t const cSize0 = cSize;
XXH64_hash_t const hash0 = XXH64(compressed, cSize, 0);
cSize = ZSTD_compressCCtx(
cctx, compressed, compressedCapacity, src, srcSize, cLevel);
FUZZ_ASSERT(cSize == cSize0);
FUZZ_ASSERT(XXH64(compressed, cSize, 0) == hash0);
}
}
FUZZ_ZASSERT(cSize);
dSize = ZSTD_decompressDCtx(dctx, result, resultCapacity, compressed, cSize);
FUZZ_ZASSERT(dSize);
/* When superblock is enabled make sure we don't expand the block more than expected.