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 <cstddef>
17 #include <cstdint>
18
19 #include "hdf_log.h"
20 #include "message_parcel.h"
21 #include "usb_impl.h"
22 #include "usbdevice_fuzzer.h"
23 #include "v1_0/usb_interface_stub.h"
24
25 using namespace OHOS::HDI::Usb::V1_0;
26
27 namespace OHOS {
28 constexpr size_t THRESHOLD = 10;
29 constexpr int32_t OFFSET = 4;
30 const std::u16string USB_INTERFACE_TOKEN = u"ohos.hdi.usb.v1_0.IUsbInterface";
31
Convert2Uint32(const uint8_t * ptr)32 uint32_t Convert2Uint32(const uint8_t *ptr)
33 {
34 if (ptr == nullptr) {
35 return 0;
36 }
37 /*
38 * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
39 * and the third digit no left
40 */
41 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
42 }
43
DoSomethingInterestingWithMyAPI(const uint8_t * rawData,size_t size)44 bool DoSomethingInterestingWithMyAPI(const uint8_t *rawData, size_t size)
45 {
46 if (rawData == nullptr) {
47 return false;
48 }
49 uint32_t code = Convert2Uint32(rawData);
50 rawData = rawData + OFFSET;
51 size = size - OFFSET;
52
53 MessageParcel data;
54 data.WriteInterfaceToken(USB_INTERFACE_TOKEN);
55 data.WriteBuffer(rawData, size);
56 data.RewindRead(0);
57 MessageParcel reply;
58 MessageOption option;
59
60 sptr<IUsbInterface> g_usbInterface = IUsbInterface::Get(false);
61 if (g_usbInterface == nullptr) {
62 HDF_LOGE("%{public}s:IUsbInterface::Get() failed.", __func__);
63 return false;
64 }
65 sptr<UsbInterfaceStub> impl = new UsbInterfaceStub(g_usbInterface);
66 if (impl == nullptr) {
67 HDF_LOGE("%{public}s:new UsbInterfaceStub failed.", __func__);
68 return false;
69 }
70 impl->OnRemoteRequest(code, data, reply, option);
71
72 return true;
73 }
74 } // namespace OHOS
75
76 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)77 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
78 {
79 if (size < OHOS::THRESHOLD) {
80 return 0;
81 }
82
83 /* Run your code on data */
84 OHOS::DoSomethingInterestingWithMyAPI(data, size);
85 return 0;
86 }
87