1 // Copyright 2021 Code Intelligence GmbH
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "com_example_ExampleFuzzerWithNative.h"
16
17 #include <limits>
18 #include <string>
19
20 // simple function containing a crash that requires coverage and string compare
21 // instrumentation for the fuzzer to find
parseInternal(const std::string & input)22 __attribute__((optnone)) void parseInternal(const std::string &input) {
23 constexpr int bar = std::numeric_limits<int>::max() - 5;
24 // Crashes with UBSan.
25 if (bar + input[0] == 300) {
26 return;
27 }
28 if (input[0] == 'a' && input[1] == 'b' && input[5] == 'c') {
29 if (input.find("secret_in_native_library") != std::string::npos) {
30 // Crashes with ASan.
31 [[maybe_unused]] char foo = input[input.size() + 2];
32 }
33 }
34 }
35
Java_com_example_ExampleFuzzerWithNative_parse(JNIEnv * env,jobject o,jstring bytes)36 JNIEXPORT jboolean JNICALL Java_com_example_ExampleFuzzerWithNative_parse(
37 JNIEnv *env, jobject o, jstring bytes) {
38 const char *input(env->GetStringUTFChars(bytes, nullptr));
39 parseInternal(input);
40 env->ReleaseStringUTFChars(bytes, input);
41 return false;
42 }
43