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 <cstddef>
17 #include <cstdint>
18 #include "hdf_log.h"
19 #include "usb_fuzzer.h"
20 #include "v1_0/usb_interface_stub.h"
21
22 using namespace OHOS::HDI::Usb::V1_0;
23
24 namespace OHOS {
25 constexpr size_t THRESHOLD = 10;
26 constexpr int32_t OFFSET = 4;
27 constexpr int32_t ZERO_BIT = 0;
28 constexpr int32_t FIRST_BIT = 1;
29 constexpr int32_t SECOND_BIT = 2;
30 constexpr int32_t THIRD_BIT = 3;
31 constexpr int32_t ZERO_MOVE_LEN = 24;
32 constexpr int32_t FIRST_MOVE_LEN = 16;
33 constexpr int32_t SECOND_MOVE_LEN = 8;
34 const std::u16string USB_INTERFACE_TOKEN = u"ohos.hdi.usb.v1_0.IUsbInterface";
35
Convert2Uint32(const uint8_t * ptr)36 uint32_t Convert2Uint32(const uint8_t *ptr)
37 {
38 if (ptr == nullptr) {
39 HDF_LOGE("%{public}s: ptr is null", __func__);
40 return 0;
41 }
42 /*
43 * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
44 * and the third digit no left
45 */
46 return (ptr[ZERO_BIT] << ZERO_MOVE_LEN) | (ptr[FIRST_BIT] << FIRST_MOVE_LEN) | (ptr[SECOND_BIT] <<
47 SECOND_MOVE_LEN) | (ptr[THIRD_BIT]);
48 }
49
DoSomethingInterestingWithMyAPI(const uint8_t * rawData,size_t size)50 bool DoSomethingInterestingWithMyAPI(const uint8_t *rawData, size_t size)
51 {
52 if (rawData == nullptr) {
53 HDF_LOGE("%{public}s: rawData is null", __func__);
54 return false;
55 }
56 uint32_t code = Convert2Uint32(rawData);
57 rawData = rawData + OFFSET;
58 size = size - OFFSET;
59
60 MessageParcel data;
61 data.WriteInterfaceToken(USB_INTERFACE_TOKEN);
62 data.WriteBuffer(rawData, size);
63 data.RewindRead(0);
64 MessageParcel reply;
65 MessageOption option;
66 sptr<IUsbInterface> usbInterface = IUsbInterface::Get(false);
67 if (usbInterface == nullptr) {
68 HDF_LOGE("%{public}s: get usbInterface failed", __func__);
69 return false;
70 }
71 sptr<UsbInterfaceStub> interfaceStub = new UsbInterfaceStub(usbInterface);
72 if (interfaceStub == nullptr) {
73 HDF_LOGE("%{public}s: new interfaceStub failed", __func__);
74 return false;
75 }
76 interfaceStub->OnRemoteRequest(code, data, reply, option);
77
78 return true;
79 }
80 } // namespace OHOS
81
82 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)83 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
84 {
85 if (size < OHOS::THRESHOLD) {
86 return 0;
87 }
88
89 /* Run your code on data */
90 OHOS::DoSomethingInterestingWithMyAPI(data, size);
91 return 0;
92 }
93