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 "hdibackend_fuzzer.h"
17
18 #include <securec.h>
19
20 #include "hdi_backend.h"
21 #include "surface.h"
22 using namespace OHOS::Rosen;
23
24 namespace OHOS {
25 namespace {
26 constexpr size_t STR_LEN = 10;
27 const uint8_t* data_ = nullptr;
28 size_t size_ = 0;
29 size_t pos;
30 }
31
32 /*
33 * describe: get data from outside untrusted data(data_) which size is according to sizeof(T)
34 * tips: only support basic type
35 */
36 template<class T>
GetData()37 T GetData()
38 {
39 T object {};
40 size_t objectSize = sizeof(object);
41 if (data_ == nullptr || objectSize > size_ - pos) {
42 return object;
43 }
44 errno_t ret = memcpy_s(&object, objectSize, data_ + pos, objectSize);
45 if (ret != EOK) {
46 return {};
47 }
48 pos += objectSize;
49 return object;
50 }
51
52 /*
53 * get a string from data_
54 */
GetStringFromData(int strlen)55 std::string GetStringFromData(int strlen)
56 {
57 char cstr[strlen];
58 cstr[strlen - 1] = '\0';
59 for (int i = 0; i < strlen - 1; i++) {
60 cstr[i] = GetData<char>();
61 }
62 std::string str(cstr);
63 return str;
64 }
65
DoSomethingInterestingWithMyAPI(const uint8_t * data,size_t size)66 bool DoSomethingInterestingWithMyAPI(const uint8_t* data, size_t size)
67 {
68 if (data == nullptr) {
69 return false;
70 }
71
72 // initialize
73 data_ = data;
74 size_ = size;
75 pos = 0;
76
77 // get data
78 uint32_t screenId = GetData<uint32_t>();
79 void* data1 = static_cast<void*>(GetStringFromData(STR_LEN).data());
80 void* data2 = static_cast<void*>(GetStringFromData(STR_LEN).data());
81
82 // test
83 OutputPtr outputptr = HdiOutput::CreateHdiOutput(screenId);
84 outputptr->Init();
85 std::vector<LayerInfoPtr> layerInfos;
86 LayerInfoPtr layerInfoptr = HdiLayerInfo::CreateHdiLayerInfo();
87 sptr<IConsumerSurface> cSurface = IConsumerSurface::Create();
88 layerInfoptr->SetSurface(cSurface);
89 layerInfos.push_back(layerInfoptr);
90 outputptr->SetLayerInfo(layerInfos);
91
92 HdiBackend* hdiBackend_ = HdiBackend::GetInstance();
93 auto onScreenHotplugFunc = [](OutputPtr &, bool, void*) -> void {};
94 auto onPrepareCompleteFunc = [](sptr<Surface> &, const struct PrepareCompleteParam &, void*) -> void {};
95 hdiBackend_->RegScreenHotplug(onScreenHotplugFunc, data1);
96 hdiBackend_->RegPrepareComplete(onPrepareCompleteFunc, data2);
97 hdiBackend_->Repaint(outputptr);
98
99 return true;
100 }
101 }
102
103 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)104 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
105 {
106 /* Run your code on data */
107 OHOS::DoSomethingInterestingWithMyAPI(data, size);
108 return 0;
109 }
110
111