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[fuzzer] Debug the monster_tets.bfbs on clusterfuzz server (#6392)

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For some reason, this fuzzer failed to load the binary schema file
when run on the `/clusterfuzz` server.
Issue: https://oss-fuzz.com/testcase-detail/6215075358703616
This issue doesn't reproduce locally with the latest oss-fuzz docker image.
This commit is contained in:
Vladimir Glavnyy
2021-01-09 02:09:41 +07:00
committed by GitHub
parent 809fe49c7a
commit 85719669cb
1 changed files with 28 additions and 10 deletions
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38
tests/fuzzer/flatbuffers_monster_fuzzer.cc
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@@ -18,6 +18,7 @@
#include <stdint.h>
#include <clocale>
#include <filesystem>
#include <string>
#include "cpp17/generated_cpp17/monster_test_generated.h"
@@ -33,22 +34,39 @@ static constexpr uint8_t flags_strict_json = 0x80;
static constexpr uint8_t flags_skip_unexpected_fields_in_json = 0x40;
static constexpr uint8_t flags_allow_non_utf8 = 0x20;
std::string LoadBinarySchema(const char *file_name) {
std::string schemafile;
TEST_EQ(true,
flatbuffers::LoadFile(file_name, true, &schemafile));
bool TestFileExists(const char *file_name) {
namespace fs = std::filesystem;
const bool file_exists = flatbuffers::FileExists(file_name);
TEST_OUTPUT_LINE("@DEBUG: test file, exists: %d, name:'%s'", file_exists,
file_name);
if (file_exists) return true;
flatbuffers::Verifier verifier(
reinterpret_cast<const uint8_t *>(schemafile.c_str()),
schemafile.size());
TEST_EQ(true, reflection::VerifySchemaBuffer(verifier));
return schemafile;
const auto cwd = fs::current_path();
TEST_OUTPUT_LINE("@DEBUG: file '%s' not found with flatbuffers::FileExists()",
file_name);
TEST_OUTPUT_LINE("@DEBUG: CWD: '%s', fs::exists: %d", cwd.c_str(),
fs::exists(cwd / file_name));
for (const auto &entry : fs::directory_iterator(cwd)) {
TEST_OUTPUT_LINE("@DEBUG: CWD entry: '%s'", entry.path().c_str());
}
return false;
}
std::string LoadBinarySchema(const char *file_name) {
TEST_EQ(true, TestFileExists(file_name));
std::string schemafile;
TEST_EQ(true, flatbuffers::LoadFile(file_name, true, &schemafile));
flatbuffers::Verifier verifier(
reinterpret_cast<const uint8_t *>(schemafile.c_str()), schemafile.size());
TEST_EQ(true, reflection::VerifySchemaBuffer(verifier));
return schemafile;
}
std::string do_test(const flatbuffers::IDLOptions &opts,
const std::string input_json) {
// once loaded from disk
static const std::string schemafile = LoadBinarySchema("./monster_test.bfbs");
static const std::string schemafile = LoadBinarySchema("monster_test.bfbs");
// parse schema first, so we can use it to parse the data after
flatbuffers::Parser parser;
TEST_EQ(true, parser.Deserialize(