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 "continuationmanager_fuzzer.h"
17
18 #include <cstddef>
19 #include <cstdint>
20
21 #include "dtbschedmgr_log.h"
22 #include "distributed_ability_manager_interface.h"
23 #include "distributed_ability_manager_stub.h"
24 #include "distributed_ability_manager_service.h"
25 #include "fuzz_util.h"
26
27 namespace OHOS {
28 namespace DistributedSchedule {
29 namespace {
30 constexpr int32_t DISTRIBUTED_SCHED_SA_ID = 1401;
31 constexpr size_t THRESHOLD = 10;
32 constexpr uint16_t MAX_CALL_TRANSACTION = 510;
33 constexpr int32_t OFFSET = 4;
34 const std::u16string DMS_INTERFACE_TOKEN = u"OHOS.DistributedSchedule.IDistributedAbilityManager";
35 const std::u16string DMS_STUB_INTERFACE_TOKEN = u"ohos.distributedschedule.accessToken";
36 const std::string TAG = "ContinuationFuzz";
37 }
38
Convert2Uint32(const uint8_t * ptr)39 uint32_t Convert2Uint32(const uint8_t* ptr)
40 {
41 if (ptr == nullptr) {
42 return 0;
43 }
44 return (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]); // this is a general method of converting in fuzz
45 }
46
FuzzUnregister(const uint8_t * rawData,size_t size)47 void FuzzUnregister(const uint8_t* rawData, size_t size)
48 {
49 FuzzUtil::MockPermission();
50 uint32_t code = Convert2Uint32(rawData);
51 rawData = rawData + OFFSET;
52 size = size - OFFSET;
53 MessageParcel data;
54 data.WriteInterfaceToken(DMS_STUB_INTERFACE_TOKEN);
55 data.WriteBuffer(rawData, size);
56 data.RewindRead(0);
57 MessageParcel reply;
58 MessageOption option;
59 auto systemAbilityMgr = SystemAbilityManagerClient::GetInstance().GetSystemAbilityManager();
60 if (systemAbilityMgr == nullptr) {
61 HILOGE("system ability manager is nullptr.");
62 return;
63 }
64 auto remoteObj = systemAbilityMgr->GetSystemAbility(DISTRIBUTED_SCHED_SA_ID);
65 if (remoteObj == nullptr) {
66 HILOGE("failed to get form manager service");
67 return;
68 }
69 remoteObj->SendRequest(code % MAX_CALL_TRANSACTION, data, reply, option);
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 if (size < OHOS::DistributedSchedule::THRESHOLD) {
78 return 0;
79 }
80
81 OHOS::DistributedSchedule::FuzzUnregister(data, size);
82 return 0;
83 }