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 "diff_patch/diff_patch_interface.h"
17
18 #include <array>
19 #include <cstddef>
20 #include <cstdint>
21 #include <iostream>
22 #include <string>
23 #include <vector>
24 #include <fstream>
25 #include <cstdio>
26 #include "log/log.h"
27 #include <fuzzer/FuzzedDataProvider.h>
28
29 using namespace Updater;
30 namespace OHOS {
WriteDataToFile(const char* data, size_t size, const char* filePath, bool isAppend = false)31 bool WriteDataToFile(const char* data, size_t size, const char* filePath, bool isAppend = false)
32 {
33 std::ofstream ofs;
34 if (isAppend) {
35 ofs.open(filePath, std::ios::app | std::ios::binary);
36 } else {
37 ofs.open(filePath, std::ios::ate | std::ios::binary);
38 }
39 if (!ofs.is_open()) {
40 LOG(ERROR) << "open " << filePath << " failed";
41 return false;
42 }
43 ofs.write(data, size);
44 ofs.close();
45 return true;
46 }
47
FuzzApplyPatch(const uint8_t* data, size_t size)48 void FuzzApplyPatch(const uint8_t* data, size_t size)
49 {
50 FuzzedDataProvider fdp(data, size);
51 const int magicNumSize = 4;
52 const char* bspatchPath = "/data/applyPatchfuzzBspatch";
53 const char* imgpatchPath = "/data/applyPatchfuzzImgpatch";
54 const char* oldFilePath = "/data/applyPatchfuzzOldFile";
55 const char* newFilePath = "/data/applyPatchfuzzNewFile";
56 bool isPkgFormat = false;
57 bool ret = WriteDataToFile(reinterpret_cast<const char*>(data), size, oldFilePath);
58 isPkgFormat = fdp.ConsumeBool();
59 if (isPkgFormat) {
60 ret &= WriteDataToFile("BSDIFF40", magicNumSize, bspatchPath);
61 ret &= WriteDataToFile(reinterpret_cast<const char*>(data), size, bspatchPath, true);
62 ApplyPatch(bspatchPath, oldFilePath, newFilePath);
63 } else {
64 ret &= WriteDataToFile("PKGDIFF0", magicNumSize, imgpatchPath);
65 ret &= WriteDataToFile(reinterpret_cast<const char*>(data), size, imgpatchPath, true);
66 ApplyPatch(imgpatchPath, oldFilePath, newFilePath);
67 }
68 if (!ret) {
69 LOG(ERROR) << "an invalid fuzztest due to input file creation failure";
70 }
71 }
72 }
73
74 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)75 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
76 {
77 /* Run your code on data */
78 OHOS::FuzzApplyPatch(data, size);
79 return 0;
80 }
81