1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #define FUZZ_LOG_TAG "main"
17
18 #include "binder.h"
19 #include "binder_ndk.h"
20 #include "hwbinder.h"
21 #include "util.h"
22
23 #include <android-base/logging.h>
24
25 #include <cstdlib>
26 #include <ctime>
27
28 template <typename P>
doFuzz(const std::vector<ParcelRead<P>> & reads,const std::vector<uint8_t> & input,const std::vector<uint8_t> & instructions)29 void doFuzz(
30 const std::vector<ParcelRead<P>>& reads,
31 const std::vector<uint8_t>& input,
32 const std::vector<uint8_t>& instructions) {
33
34 P p;
35 p.setData(input.data(), input.size());
36
37 // since we are only using a byte to index
38 CHECK(reads.size() <= 255) << reads.size();
39
40 for (size_t i = 0; i < instructions.size() - 1; i += 2) {
41 uint8_t a = instructions[i];
42 uint8_t readIdx = a % reads.size();
43
44 uint8_t b = instructions[i + 1];
45
46 FUZZ_LOG() << "Instruction: " << (i / 2) + 1 << "/" << instructions.size() / 2
47 << " cmd: " << static_cast<size_t>(a) << " (" << static_cast<size_t>(readIdx)
48 << ") arg: " << static_cast<size_t>(b) << " size: " << p.dataSize()
49 << " avail: " << p.dataAvail() << " pos: " << p.dataPosition()
50 << " cap: " << p.dataCapacity();
51
52 reads[readIdx](p, b);
53 }
54 }
55
fuzz(uint8_t options,const std::vector<uint8_t> & input,const std::vector<uint8_t> & instructions)56 void fuzz(uint8_t options, const std::vector<uint8_t>& input, const std::vector<uint8_t>& instructions) {
57 uint8_t parcelType = options & 0x3;
58
59 switch (parcelType) {
60 case 0x0:
61 doFuzz<::android::hardware::Parcel>(HWBINDER_PARCEL_READ_FUNCTIONS, input,
62 instructions);
63 break;
64 case 0x1:
65 doFuzz<::android::Parcel>(BINDER_PARCEL_READ_FUNCTIONS, input, instructions);
66 break;
67 case 0x2:
68 doFuzz<NdkParcelAdapter>(BINDER_NDK_PARCEL_READ_FUNCTIONS, input, instructions);
69 break;
70 case 0x3:
71 /*reserved for future use*/
72 break;
73 default:
74 LOG_ALWAYS_FATAL("unknown parcel type %d", static_cast<int>(parcelType));
75 }
76 }
77
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)78 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
79 if (size <= 1) return 0; // no use
80
81 // avoid timeouts, see b/142617274, b/142473153
82 if (size > 50000) return 0;
83
84 uint8_t options = *data;
85 data++;
86 size--;
87
88 // TODO: generate 'objects' data
89
90 // data to fill out parcel
91 size_t inputLen = size / 2;
92 std::vector<uint8_t> input(data, data + inputLen);
93 data += inputLen;
94 size -= inputLen;
95
96 // data to use to determine what to do
97 size_t instructionLen = size;
98 std::vector<uint8_t> instructions(data, data + instructionLen);
99 data += instructionLen;
100 size -= instructionLen;
101
102 CHECK(size == 0) << "size: " << size;
103
104 FUZZ_LOG() << "options: " << (int)options << " inputLen: " << inputLen << " instructionLen: " << instructionLen;
105 FUZZ_LOG() << "input: " << hexString(input);
106 FUZZ_LOG() << "instructions: " << hexString(instructions);
107
108 fuzz(options, input, instructions);
109 return 0;
110 }
111