1 /*
2  * Copyright (c) 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 "startuser_fuzzer.h"
17 
18 #include <cstddef>
19 #include <cstdint>
20 
21 #include "ability_manager_client.h"
22 #include "securec.h"
23 
24 using namespace OHOS::AAFwk;
25 using namespace OHOS::AppExecFwk;
26 
27 namespace OHOS {
28 namespace {
29 constexpr size_t FOO_MAX_LEN = 1024;
30 constexpr size_t U32_AT_SIZE = 4;
31 }
GetU32Data(const char * ptr)32 uint32_t GetU32Data(const char* ptr)
33 {
34     // convert fuzz input data to an integer
35     return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | ptr[3];
36 }
DoSomethingInterestingWithMyAPI(const char * data,size_t size)37 bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
38 {
39     auto abilitymgr = AbilityManagerClient::GetInstance();
40     if (!abilitymgr) {
41         return false;
42     }
43 
44     int accountId = static_cast<int>(GetU32Data(data));
45     sptr<IUserCallback> callback;
46     abilitymgr->StartUser(accountId, callback);
47 
48     return true;
49 }
50 }
51 
52 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)53 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
54 {
55     /* Run your code on data */
56     if (data == nullptr) {
57         std::cout << "invalid data" << std::endl;
58         return 0;
59     }
60 
61     /* Validate the length of size */
62     if (size > OHOS::FOO_MAX_LEN || size < OHOS::U32_AT_SIZE) {
63         return 0;
64     }
65 
66     char* ch = static_cast<char*>(malloc(size + 1));
67     if (ch == nullptr) {
68         std::cout << "malloc failed." << std::endl;
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         std::cout << "copy failed." << std::endl;
75         free(ch);
76         ch = nullptr;
77         return 0;
78     }
79 
80     OHOS::DoSomethingInterestingWithMyAPI(ch, size);
81     free(ch);
82     ch = nullptr;
83     return 0;
84 }