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 <cstring>
18 #include <limits>
19 #include <string>
20
21 // simple function containing a crash that requires coverage and string compare
22 // instrumentation for the fuzzer to find
parseInternal(const std::string & input)23 __attribute__((optnone)) void parseInternal(const std::string &input) {
24 constexpr int bar = std::numeric_limits<int>::max() - 5;
25 // Crashes with UBSan.
26 if (bar + input[0] == 300) {
27 return;
28 }
29 if (input[0] == 'a' && input[1] == 'b' && input[5] == 'c') {
30 if (input.find("secret_in_native_library") != std::string::npos) {
31 // Crashes with ASan, whose use-after-free hooks detect
32 const char *mem = static_cast<const char *>(malloc(2));
33 free((void *)mem);
34 [[maybe_unused]] bool foo = memcmp(mem, mem + 1, 1);
35 }
36 }
37 }
38
Java_com_example_ExampleFuzzerWithNative_parse(JNIEnv * env,jobject o,jstring bytes)39 JNIEXPORT jboolean JNICALL Java_com_example_ExampleFuzzerWithNative_parse(
40 JNIEnv *env, jobject o, jstring bytes) {
41 const char *input(env->GetStringUTFChars(bytes, nullptr));
42 parseInternal(input);
43 env->ReleaseStringUTFChars(bytes, input);
44 return false;
45 }
46