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 "ispassseqcheck_fuzzer.h"
17 #include <cstddef>
18 #include "softbus_sequence_verification.h"
19
20 namespace OHOS {
21 constexpr size_t THRESHOLD = 10;
22 constexpr uint32_t NINE = 9;
23 constexpr int32_t MINSEQ = 2;
24 constexpr int32_t MAXSEQ = -2;
25 constexpr int32_t OFFSET = 4;
26 SeqVerifyInfo seqInfo;
27 enum CmdId {
28 CMD_SOFTBUS_ONE,
29 CMD_SOFTBUS_TWO,
30 CMD_SOFTBUS_THREE,
31 };
32
Convert2Uint32(const uint8_t * ptr)33 uint32_t Convert2Uint32(const uint8_t *ptr)
34 {
35 if (ptr == nullptr) {
36 return 0;
37 }
38 /*
39 * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
40 * and the third digit no left
41 */
42 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
43 }
44
IsPassSeqCheckSwitch(uint32_t cmd,const uint8_t * rawData)45 static void IsPassSeqCheckSwitch(uint32_t cmd, const uint8_t *rawData)
46 {
47 int32_t seq = *const_cast<int32_t *>(reinterpret_cast<const int32_t *>(rawData));
48 uint64_t bit = *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(rawData));
49 cmd = cmd % NINE;
50 switch (cmd) {
51 case CMD_SOFTBUS_ONE: {
52 seqInfo.minSeq = MINSEQ;
53 seqInfo.maxSeq = seq;
54 seqInfo.recvBitmap = bit;
55 IsPassSeqCheck(&seqInfo, seq);
56 break;
57 }
58 case CMD_SOFTBUS_TWO: {
59 seqInfo.minSeq = seq;
60 seqInfo.maxSeq = MAXSEQ;
61 seqInfo.recvBitmap = bit;
62 IsPassSeqCheck(&seqInfo, seq);
63 break;
64 }
65 case CMD_SOFTBUS_THREE: {
66 seqInfo.minSeq = seq;
67 seqInfo.maxSeq = seq;
68 seqInfo.recvBitmap = bit;
69 IsPassSeqCheck(&seqInfo, seq);
70 break;
71 }
72 default:
73 break;
74 }
75 }
76
DoSomethingInterestingWithMyAPI(const uint8_t * rawData,size_t size)77 bool DoSomethingInterestingWithMyAPI(const uint8_t *rawData, size_t size)
78 {
79 (void)size;
80
81 if (rawData == nullptr) {
82 return false;
83 }
84 uint32_t cmd = Convert2Uint32(rawData);
85 rawData = rawData + OFFSET;
86
87 IsPassSeqCheckSwitch(cmd, rawData);
88 return true;
89 }
90 } // namespace OHOS
91
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)92 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
93 {
94 if (size < OHOS::THRESHOLD) {
95 return 0;
96 }
97
98 /* Run your code on data */
99 OHOS::DoSomethingInterestingWithMyAPI(data, size);
100 return 0;
101 }