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 "formhostdelegatestub_fuzzer.h"
17
18 #include <cstddef>
19 #include <cstdint>
20
21 #include "form_host_delegate_stub.h"
22 #include "securec.h"
23
24 using namespace OHOS::AppExecFwk;
25
26 namespace OHOS {
27 constexpr size_t FOO_MAX_LEN = 1024;
28 constexpr size_t U32_AT_SIZE = 4;
29 const std::u16string FORMMGR_INTERFACE_TOKEN = u"ohos.appexecfwk.FormMgr";
30 class FormHostDelegateStubFuzzTest : public FormHostDelegateStub {
31 public:
32 FormHostDelegateStubFuzzTest() = default;
33 virtual ~FormHostDelegateStubFuzzTest() = default;
RouterEvent(const int64_t formId,const Want & want)34 int32_t RouterEvent(const int64_t formId, const Want &want) override
35 {
36 return 0;
37 }
38 };
GetU32Data(const char * ptr)39 uint32_t GetU32Data(const char* ptr)
40 {
41 // convert fuzz input data to an integer
42 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | ptr[3];
43 }
DoSomethingInterestingWithMyAPI(const char * data,size_t size)44 bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
45 {
46 FormHostDelegateStubFuzzTest formHostDelegateStub;
47 uint32_t code = GetU32Data(data);
48 MessageParcel datas;
49 datas.WriteInterfaceToken(FORMMGR_INTERFACE_TOKEN);
50 datas.WriteBuffer(data, size);
51 datas.RewindRead(0);
52 MessageParcel reply;
53 MessageOption option;
54 formHostDelegateStub.OnRemoteRequest(code, datas, reply, option);
55 formHostDelegateStub.HandleRouterEvent(datas, reply);
56 return true;
57 }
58 }
59
60 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)61 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
62 {
63 /* Run your code on data */
64 if (data == nullptr) {
65 return 0;
66 }
67
68 if (size < OHOS::U32_AT_SIZE) {
69 return 0;
70 }
71
72 /* Validate the length of size */
73 if (size == 0 || size > OHOS::FOO_MAX_LEN) {
74 return 0;
75 }
76
77 char* ch = static_cast<char*>(malloc(size + 1));
78 if (ch == nullptr) {
79 return 0;
80 }
81
82 (void)memset_s(ch, size + 1, 0x00, size + 1);
83 if (memcpy_s(ch, size + 1, data, size) != EOK) {
84 free(ch);
85 ch = nullptr;
86 return 0;
87 }
88
89 OHOS::DoSomethingInterestingWithMyAPI(ch, size);
90 free(ch);
91 ch = nullptr;
92 return 0;
93 }
94
95