1 /*
2 * Copyright (c) 2023 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 "distributedbmshost_fuzzer.h"
17
18 #include <cstddef>
19 #include <cstdint>
20
21 #include "distributed_bms_host.h"
22 #include "securec.h"
23
24 using namespace OHOS::AppExecFwk;
25 namespace OHOS {
26 constexpr size_t FOO_MAX_LEN = 1024;
27 constexpr size_t U32_AT_SIZE = 4;
28 constexpr size_t MESSAGE_SIZE = 10;
29
GetU32Data(const char * ptr)30 uint32_t GetU32Data(const char* ptr)
31 {
32 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
33 }
DoSomethingInterestingWithMyAPI(const char * data,size_t size)34 bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
35 {
36 uint32_t code = (GetU32Data(data) % MESSAGE_SIZE);
37 MessageParcel datas;
38 std::u16string descriptor = DistributedBmsHost::GetDescriptor();
39 datas.WriteInterfaceToken(descriptor);
40 datas.WriteBuffer(data, size);
41 datas.RewindRead(0);
42 MessageParcel reply;
43 MessageOption option;
44 DistributedBmsHost distributedBmsHost;
45 distributedBmsHost.OnRemoteRequest(code, datas, reply, option);
46 return true;
47 }
48 }
49
50 // Fuzzer entry point.
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)51 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
52 {
53 /* Run your code on data */
54 if (data == nullptr) {
55 return 0;
56 }
57
58 if (size < OHOS::U32_AT_SIZE) {
59 return 0;
60 }
61
62 /* Validate the length of size */
63 if (size > OHOS::FOO_MAX_LEN) {
64 return 0;
65 }
66
67 char* ch = static_cast<char*>(malloc(size + 1));
68 if (ch == nullptr) {
69 return 0;
70 }
71
72 (void)memset_s(ch, size + 1, 0x00, size + 1);
73 if (memcpy_s(ch, size, data, size) != EOK) {
74 free(ch);
75 ch = nullptr;
76 return 0;
77 }
78 OHOS::DoSomethingInterestingWithMyAPI(ch, size);
79 free(ch);
80 ch = nullptr;
81 return 0;
82 }