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