1 /*
2 * Copyright (c) 2022 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 "formashmem_fuzzer.h"
17
18 #include <cstddef>
19 #include <cstdint>
20
21 #define private public
22 #define protected public
23 #include "form_ashmem.h"
24 #undef private
25 #undef protected
26 #include "securec.h"
27
28 using namespace OHOS::AppExecFwk;
29
30 namespace OHOS {
31 constexpr size_t FOO_MAX_LEN = 1024;
32 constexpr size_t U32_AT_SIZE = 4;
GetU32Data(const char * ptr)33 uint32_t GetU32Data(const char* ptr)
34 {
35 // convert fuzz input data to an integer
36 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | ptr[3];
37 }
DoSomethingInterestingWithMyAPI(const char * data,size_t size)38 bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
39 {
40 FormAshmem formAshmem;
41 std::string name(data);
42 int32_t sizes = static_cast<int32_t>(GetU32Data(data));
43 formAshmem.WriteToAshmem(name, nullptr, sizes);
44 formAshmem.GetAshmemSize();
45 return formAshmem.GetAshmemFd();
46 }
47 }
48
49 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)50 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
51 {
52 /* Run your code on data */
53 if (data == nullptr) {
54 return 0;
55 }
56
57 if (size < OHOS::U32_AT_SIZE) {
58 return 0;
59 }
60
61 /* Validate the length of size */
62 if (size == 0 || size > OHOS::FOO_MAX_LEN) {
63 return 0;
64 }
65
66 char* ch = static_cast<char*>(malloc(size + 1));
67 if (ch == nullptr) {
68 return 0;
69 }
70
71 (void)memset_s(ch, size + 1, 0x00, size + 1);
72 if (memcpy_s(ch, size + 1, data, size) != EOK) {
73 free(ch);
74 ch = nullptr;
75 return 0;
76 }
77
78 OHOS::DoSomethingInterestingWithMyAPI(ch, size);
79 free(ch);
80 ch = nullptr;
81 return 0;
82 }
83
84