1 /*
2 * Copyright (C) 2020 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
17 #include <functional>
18 #include <memory>
19
20 #include "fuzzer/FuzzedDataProvider.h"
21 #include "keymaster/serializable.h"
22
23 static constexpr uint16_t kMinBufferSize = 1;
24 static constexpr uint16_t kMaxBufferSize = 2048;
25 static constexpr uint16_t kMaxOperations = 1000;
26
27 std::vector<std::function<void(keymaster::Buffer*, FuzzedDataProvider*)>> operations = {
28
__anon2caa59c60102() 29 [](keymaster::Buffer* buf, FuzzedDataProvider*) -> void {
30 // Just reading values, but there's some interesting
31 // integer manipulation here.
32 buf->begin();
33 buf->end();
34 },
__anon2caa59c60202() 35 [](keymaster::Buffer* buf, FuzzedDataProvider*) -> void { buf->Clear(); },
__anon2caa59c60302() 36 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
37 buf->reserve(fdp->ConsumeIntegralInRange<int>(kMinBufferSize, kMaxBufferSize));
38 },
__anon2caa59c60402() 39 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
40 buf->advance_write(fdp->ConsumeIntegral<int>());
41 },
__anon2caa59c60502() 42 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
43 buf->Reinitialize(fdp->ConsumeIntegralInRange<size_t>(kMinBufferSize, kMaxBufferSize));
44 },
__anon2caa59c60602() 45 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
46 size_t buf_size = fdp->ConsumeIntegralInRange<size_t>(kMinBufferSize, kMaxBufferSize);
47 std::unique_ptr<uint8_t[]> in_buf = std::unique_ptr<uint8_t[]>(new uint8_t[buf_size]);
48 buf->Reinitialize(in_buf.get(), buf_size);
49 },
__anon2caa59c60702() 50 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
51 uint16_t buf_size = fdp->ConsumeIntegralInRange<uint16_t>(kMinBufferSize, kMaxBufferSize);
52 std::unique_ptr<uint8_t[]> in_buf = std::unique_ptr<uint8_t[]>(new uint8_t[buf_size]);
53 const uint8_t* data_ptr = in_buf.get();
54 int32_t end = fdp->ConsumeIntegralInRange<int32_t>(0, buf_size);
55 buf->Deserialize(&data_ptr, data_ptr + end);
56 },
__anon2caa59c60802() 57 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
58 uint16_t buf_size = buf->SerializedSize();
59 std::unique_ptr<uint8_t[]> out_buf = std::unique_ptr<uint8_t[]>(new uint8_t[buf_size]);
60 int32_t end = fdp->ConsumeIntegralInRange<int32_t>(0, buf_size);
61 buf->Serialize(out_buf.get(), out_buf.get() + end);
62 },
__anon2caa59c60902() 63 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
64 uint16_t buf_size = fdp->ConsumeIntegralInRange<uint16_t>(kMinBufferSize, kMaxBufferSize);
65 std::vector<uint8_t> in_buf = fdp->ConsumeBytes<uint8_t>(buf_size);
66 buf->write(in_buf.data(), fdp->ConsumeIntegralInRange<int16_t>(0, buf_size));
67 },
__anon2caa59c60a02() 68 [](keymaster::Buffer* buf, FuzzedDataProvider* fdp) -> void {
69 uint16_t buf_size = fdp->ConsumeIntegralInRange<uint16_t>(kMinBufferSize, kMaxBufferSize);
70 std::unique_ptr<uint8_t[]> out = std::unique_ptr<uint8_t[]>(new uint8_t[buf_size]);
71 buf->read(out.get(), fdp->ConsumeIntegralInRange<int16_t>(0, buf_size));
72 }};
73
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)74 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
75 FuzzedDataProvider fdp(data, size);
76 uint16_t buf_size = fdp.ConsumeIntegralInRange<uint16_t>(kMinBufferSize, kMaxBufferSize);
77 keymaster::Buffer fuzzBuffer(buf_size);
78 for (size_t i = 0; i < kMaxOperations && fdp.remaining_bytes() > 0; i++) {
79 uint8_t op = fdp.ConsumeIntegralInRange<uint8_t>(0, operations.size() - 1);
80 operations[op](&fuzzBuffer, &fdp);
81 }
82 return 0;
83 }
84