1 /*
2 * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
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
16 #include "buildcontrolmessage_fuzzer.h"
17 #include <string>
18 #include "securec.h"
19 #include "fd_holder_internal.h"
20
21
22 namespace OHOS {
23 const uint8_t* BASE_DATA = nullptr;
24 size_t g_baseSize = 0;
25 size_t g_basePos = 0;
26
GetData()27 template <class T> T GetData()
28 {
29 T object{};
30 size_t objectSize = sizeof(object);
31 if ((BASE_DATA == nullptr) || (objectSize > g_baseSize - g_basePos)) {
32 return object;
33 }
34 errno_t ret = memcpy_s(&object, objectSize, BASE_DATA + g_basePos, objectSize);
35 if (ret != EOK) {
36 return {};
37 }
38 g_basePos += objectSize;
39 return object;
40 }
41
FuzzBuildControlMessage(const uint8_t * data,size_t size)42 bool FuzzBuildControlMessage(const uint8_t* data, size_t size)
43 {
44 bool result = false;
45 BASE_DATA = data;
46 g_baseSize = size;
47 g_basePos = 0;
48 if (size > sizeof(struct msghdr) + sizeof(int)) {
49 struct msghdr msghdr = GetData<struct msghdr>();
50 int fd = GetData<int>();
51 if (!BuildControlMessage(&msghdr, &fd, 1, false)) {
52 result = true;
53 }
54 }
55 return result;
56 }
57 }
58
59 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)60 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
61 {
62 /* Run your code on data */
63 OHOS::FuzzBuildControlMessage(data, size);
64 return 0;
65 }
66