| /* |
| * Copyright (C) 2020 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. |
| */ |
| |
| #include <binder/MemoryDealer.h> |
| #include <commonFuzzHelpers.h> |
| #include <fuzzer/FuzzedDataProvider.h> |
| #include <string> |
| #include <unordered_set> |
| |
| namespace android { |
| |
| static constexpr size_t kMaxBufferSize = 10000; |
| static constexpr size_t kMaxDealerSize = 1024 * 512; |
| static constexpr size_t kMaxAllocSize = 1024; |
| |
| // Fuzzer entry point. |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| if (size > kMaxBufferSize) { |
| return 0; |
| } |
| |
| FuzzedDataProvider fdp(data, size); |
| size_t dSize = fdp.ConsumeIntegralInRange<size_t>(0, kMaxDealerSize); |
| std::string name = fdp.ConsumeRandomLengthString(fdp.remaining_bytes()); |
| uint32_t flags = fdp.ConsumeIntegral<uint32_t>(); |
| sp<MemoryDealer> dealer = new MemoryDealer(dSize, name.c_str(), flags); |
| |
| // This is used to track offsets that have been freed already to avoid an expected fatal log. |
| std::unordered_set<size_t> free_list; |
| |
| while (fdp.remaining_bytes() > 0) { |
| fdp.PickValueInArray<std::function<void()>>({ |
| [&]() -> void { dealer->getAllocationAlignment(); }, |
| [&]() -> void { dealer->getMemoryHeap(); }, |
| [&]() -> void { |
| size_t offset = fdp.ConsumeIntegral<size_t>(); |
| |
| // Offset has already been freed, so return instead. |
| if (free_list.find(offset) != free_list.end()) return; |
| |
| dealer->deallocate(offset); |
| free_list.insert(offset); |
| }, |
| [&]() -> void { |
| std::string randString = fdp.ConsumeRandomLengthString(fdp.remaining_bytes()); |
| dealer->dump(randString.c_str()); |
| }, |
| [&]() -> void { |
| size_t allocSize = fdp.ConsumeIntegralInRange<size_t>(0, kMaxAllocSize); |
| sp<IMemory> allocated = dealer->allocate(allocSize); |
| // If the allocation was successful, try to write to it |
| if (allocated != nullptr && allocated->unsecurePointer() != nullptr) { |
| memset(allocated->unsecurePointer(), 1, allocated->size()); |
| |
| // Clear the address from freelist since it has been allocated over again. |
| free_list.erase(allocated->offset()); |
| } |
| }, |
| })(); |
| } |
| |
| return 0; |
| } |
| } // namespace android |