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// Copyright 2021 Code Intelligence GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "jvm_tooling.h"
#include "coverage_tracker.h"
#include "fuzz_target_runner.h"
#include "gflags/gflags.h"
#include "gtest/gtest.h"
#include "tools/cpp/runfiles/runfiles.h"
DECLARE_string(cp);
DECLARE_string(jvm_args);
DECLARE_string(target_class);
DECLARE_string(target_args);
DECLARE_string(agent_path);
DECLARE_string(instrumentation_excludes);
#ifdef _WIN32
#define ARG_SEPARATOR ";"
#else
#define ARG_SEPARATOR ":"
#endif
namespace jazzer {
std::vector<std::string> splitOnSpace(const std::string &s);
TEST(SpaceSplit, SpaceSplitSimple) {
ASSERT_EQ((std::vector<std::string>{"first", "se\\ cond", "third"}),
splitOnSpace("first se\\ cond third"));
}
class JvmToolingTest : public ::testing::Test {
protected:
// After DestroyJavaVM() no new JVM instance can be created in the same
// process, so we set up a single JVM instance for this test binary which gets
// destroyed after all tests in this test suite have finished.
static void SetUpTestCase() {
FLAGS_jvm_args =
"-Denv1=va\\" ARG_SEPARATOR "l1\\\\" ARG_SEPARATOR "-Denv2=val2";
FLAGS_instrumentation_excludes = "**";
using ::bazel::tools::cpp::runfiles::Runfiles;
Runfiles *runfiles = Runfiles::CreateForTest();
FLAGS_cp = runfiles->Rlocation(FLAGS_cp);
jvm_ = std::make_unique<JVM>("test_executable");
}
static void TearDownTestCase() { jvm_.reset(nullptr); }
static std::unique_ptr<JVM> jvm_;
};
std::unique_ptr<JVM> JvmToolingTest::jvm_ = nullptr;
TEST_F(JvmToolingTest, ClassNotFound) {
ASSERT_THROW(jvm_->FindClass(""), std::runtime_error);
ASSERT_THROW(jvm_->FindClass("test.NonExistingClass"), std::runtime_error);
ASSERT_THROW(jvm_->FindClass("test/NonExistingClass"), std::runtime_error);
}
TEST_F(JvmToolingTest, ClassInClassPath) {
ASSERT_NE(nullptr, jvm_->FindClass("test.PropertyPrinter"));
ASSERT_NE(nullptr, jvm_->FindClass("test/PropertyPrinter"));
}
TEST_F(JvmToolingTest, JniProperties) {
auto property_printer_class = jvm_->FindClass("test.PropertyPrinter");
ASSERT_NE(nullptr, property_printer_class);
auto method_id =
jvm_->GetStaticMethodID(property_printer_class, "printProperty",
"(Ljava/lang/String;)Ljava/lang/String;");
ASSERT_NE(nullptr, method_id);
auto &env = jvm_->GetEnv();
for (const auto &el : std::vector<std::pair<std::string, std::string>>{
{"not set property", ""},
{"env1", "va" ARG_SEPARATOR "l1\\"},
{"env2", "val2"}}) {
jstring str = env.NewStringUTF(el.first.c_str());
auto ret = (jstring)env.CallStaticObjectMethod(property_printer_class,
method_id, str);
ASSERT_FALSE(env.ExceptionCheck());
if (el.second.empty()) {
ASSERT_EQ(nullptr, ret);
} else {
ASSERT_NE(nullptr, ret);
jboolean is_copy;
ASSERT_EQ(el.second, jvm_->GetEnv().GetStringUTFChars(ret, &is_copy));
}
}
}
TEST_F(JvmToolingTest, SimpleFuzzTarget) {
// see testdata/test/SimpleFuzzTarget.java for the implementation of the fuzz
// target
FLAGS_target_class = "test/SimpleFuzzTarget";
FLAGS_target_args = "";
FuzzTargetRunner fuzz_target_runner(*jvm_);
// normal case: fuzzerTestOneInput returns false
std::string input("random");
ASSERT_EQ(RunResult::kOk, fuzz_target_runner.Run(
(const uint8_t *)input.c_str(), input.size()));
// exception is thrown in fuzzerTestOneInput
input = "crash";
ASSERT_EQ(
RunResult::kException,
fuzz_target_runner.Run((const uint8_t *)input.c_str(), input.size()));
}
class ExceptionPrinterTest : public ExceptionPrinter {
public:
ExceptionPrinterTest(JVM &jvm) : ExceptionPrinter(jvm), jvm_(jvm) {}
std::string TriggerJvmException() {
jclass illegal_argument_exception =
jvm_.FindClass("java.lang.IllegalArgumentException");
jvm_.GetEnv().ThrowNew(illegal_argument_exception, "Test");
jthrowable exception = jvm_.GetEnv().ExceptionOccurred();
jvm_.GetEnv().ExceptionClear();
return getStackTrace(exception);
}
private:
const JVM &jvm_;
};
TEST_F(JvmToolingTest, ExceptionPrinter) {
ExceptionPrinterTest exception_printer(*jvm_);
// a.k.a std::string.startsWith(java.lang...)
ASSERT_TRUE(exception_printer.TriggerJvmException().rfind(
"java.lang.IllegalArgumentException", 0) == 0);
}
TEST_F(JvmToolingTest, FuzzTargetWithInit) {
// see testdata/test/FuzzTargetWithInit.java for the implementation of the
// fuzz target. All string arguments provided in fuzzerInitialize(String[])
// will cause a crash if input in fuzzerTestOneInput(byte[]).
FLAGS_target_class = "test/FuzzTargetWithInit";
FLAGS_target_args = "crash_now crash_harder";
FuzzTargetRunner fuzz_target_runner(*jvm_);
// normal case: fuzzerTestOneInput returns false
std::string input("random");
ASSERT_EQ(RunResult::kOk, fuzz_target_runner.Run(
(const uint8_t *)input.c_str(), input.size()));
input = "crash_now";
ASSERT_EQ(
RunResult::kException,
fuzz_target_runner.Run((const uint8_t *)input.c_str(), input.size()));
input = "this is harmless";
ASSERT_EQ(RunResult::kOk, fuzz_target_runner.Run(
(const uint8_t *)input.c_str(), input.size()));
input = "crash_harder";
ASSERT_EQ(
RunResult::kException,
fuzz_target_runner.Run((const uint8_t *)input.c_str(), input.size()));
}
TEST_F(JvmToolingTest, TestCoverageMap) {
CoverageTracker::Clear();
// check that after the initial clear the first coverage counter is 0
auto coverage_counters_array = CoverageTracker::GetCoverageCounters();
ASSERT_EQ(0, coverage_counters_array[0]);
FLAGS_target_class = "test/FuzzTargetWithCoverage";
FLAGS_target_args = "";
FuzzTargetRunner fuzz_target_runner(*jvm_);
// run a fuzz target input which will cause the first coverage counter to
// increase
fuzz_target_runner.Run(nullptr, 0);
ASSERT_EQ(1, coverage_counters_array[0]);
CoverageTracker::Clear();
// back to initial state
ASSERT_EQ(0, coverage_counters_array[0]);
// calling the fuzz target twice
fuzz_target_runner.Run(nullptr, 0);
fuzz_target_runner.Run(nullptr, 0);
ASSERT_EQ(2, coverage_counters_array[0]);
}
} // namespace jazzer
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