b62e324406
Adds a fuzzer for Unwinder. This will likely cover a large portion of the library, as it uses many of the library's features in the process of setting up the Unwinder. Hopefully this, combined with the calls Unwinder makes internally, will provide sufficient coverage. Rough coverage estimate (this is drastically lower than the true number due to shared libraries): 6.6% Test: Ran on device for a few hours Signed-off-by: Dylan Katz <dylan.katz@leviathansecurity.com> Change-Id: I813e204df595ff38dccfb73be7fff5c080aaa043
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <functional>
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#include <iostream>
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#include <vector>
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#include <unwindstack/JitDebug.h>
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#include <unwindstack/Maps.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/Unwinder.h>
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#include "../MemoryFake.h"
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#include "UnwinderComponentCreator.h"
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#include "fuzzer/FuzzedDataProvider.h"
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namespace unwindstack {
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static constexpr int kMaxUnwindStringLen = 50;
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static constexpr int kMaxUnwindStrings = 50;
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void PerformUnwind(FuzzedDataProvider* data_provider, Unwinder* unwinder) {
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// 0 = don't set any values
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// 1 = set initial_map_names_to_skip
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// 2 = set map_suffixes_to_ignore
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// 3 = set both
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uint8_t set_values = data_provider->ConsumeIntegral<uint8_t>() % 4;
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if (set_values == 0) {
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unwinder->Unwind();
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} else if (set_values == 1) {
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// Only setting initial_map_names_to_skip
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std::vector<std::string> skip_names =
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GetStringList(data_provider, kMaxUnwindStringLen, kMaxUnwindStrings);
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unwinder->Unwind(&skip_names, nullptr);
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} else if (set_values == 2) {
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// Only setting map_suffixes_to_ignore
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std::vector<std::string> ignore_suffixes =
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GetStringList(data_provider, kMaxUnwindStringLen, kMaxUnwindStrings);
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unwinder->Unwind(nullptr, &ignore_suffixes);
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} else if (set_values == 3) {
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// Setting both values
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std::vector<std::string> skip_names =
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GetStringList(data_provider, kMaxUnwindStringLen, kMaxUnwindStrings);
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std::vector<std::string> ignore_suffixes =
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GetStringList(data_provider, kMaxUnwindStringLen, kMaxUnwindStrings);
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unwinder->Unwind(&skip_names, &ignore_suffixes);
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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FuzzedDataProvider data_provider(data, size);
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// We need to construct an unwinder.
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// Generate the Maps:
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std::unique_ptr<Maps> maps = GetMaps(&data_provider);
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// Generate the Regs:
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uint8_t arch_val = data_provider.ConsumeIntegralInRange<uint8_t>(1, kArchCount);
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ArchEnum arch = static_cast<ArchEnum>(arch_val);
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std::unique_ptr<Regs> regs = GetRegisters(arch);
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// Generate memory:
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std::shared_ptr<Memory> memory = std::make_shared<MemoryFake>();
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PutElfFilesInMemory(reinterpret_cast<MemoryFake*>(memory.get()), &data_provider);
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size_t max_frames = data_provider.ConsumeIntegralInRange<size_t>(0, 5000);
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std::unique_ptr<JitDebug> jit_debug_ptr = std::make_unique<JitDebug>(memory);
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// Create instance
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Unwinder unwinder(max_frames, maps.get(), regs.get(), memory);
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unwinder.SetJitDebug(jit_debug_ptr.get(), arch);
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unwinder.SetResolveNames(data_provider.ConsumeBool());
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// Call unwind
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PerformUnwind(&data_provider, &unwinder);
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// Run some additional logic that changes after unwind
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uint64_t pc = data_provider.ConsumeIntegral<uint64_t>();
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unwinder.BuildFrameFromPcOnly(pc);
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unwinder.ConsumeFrames();
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return 0;
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}
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} // namespace unwindstack
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