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// Copyright 2019 The Dawn Authors
//
// 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 "dawn/fuzzers/DawnWireServerFuzzer.h"
#include <fstream>
#include <memory>
#include <vector>
#include "dawn/common/Assert.h"
#include "dawn/common/DynamicLib.h"
#include "dawn/common/Log.h"
#include "dawn/common/SystemUtils.h"
#include "dawn/dawn_proc.h"
#include "dawn/native/DawnNative.h"
#include "dawn/utils/SystemUtils.h"
#include "dawn/webgpu_cpp.h"
#include "dawn/wire/WireServer.h"
namespace {
class DevNull : public dawn::wire::CommandSerializer {
public:
size_t GetMaximumAllocationSize() const override {
// Some fuzzer bots have a 2GB allocation limit. Pick a value reasonably below that.
return 1024 * 1024 * 1024;
}
void* GetCmdSpace(size_t size) override {
if (size > buf.size()) {
buf.resize(size);
}
return buf.data();
}
bool Flush() override { return true; }
private:
std::vector<char> buf;
};
std::unique_ptr<dawn::native::Instance> sInstance;
static bool (*sAdapterSupported)(const dawn::native::Adapter&) = nullptr;
#if DAWN_PLATFORM_IS(WINDOWS) && defined(ADDRESS_SANITIZER)
static dawn::DynamicLib sVulkanLoader;
#endif
} // namespace
int DawnWireServerFuzzer::Initialize(int* argc, char*** argv) {
// TODO(crbug.com/1038952): The Instance must be static because destructing the vkInstance with
// Swiftshader crashes libFuzzer. When this is fixed, move this into Run so that error injection
// for adapter discovery can be fuzzed.
sInstance = std::make_unique<dawn::native::Instance>();
// TODO(crbug.com/1038952): Although we keep a static instance, when discovering default Vulkan
// adapters, if no adapter is found, the vulkan loader DLL will be loaded and then unloaded,
// resulting in ASAN false positives. We work around this by explicitly loading the loader
// without unloading it here.
#if DAWN_PLATFORM_IS(WINDOWS) && defined(ADDRESS_SANITIZER)
sVulkanLoader.Open(dawn::GetExecutableDirectory().value_or("") + "vulkan-1.dll");
#endif
sInstance->DiscoverDefaultAdapters();
return 0;
}
int DawnWireServerFuzzer::Run(const uint8_t* data,
size_t size,
bool (*AdapterSupported)(const dawn::native::Adapter&),
bool supportsErrorInjection) {
// We require at least the injected error index.
if (size < sizeof(uint64_t)) {
return 0;
}
// Get and consume the injected error index.
uint64_t injectedErrorIndex = *reinterpret_cast<const uint64_t*>(data);
data += sizeof(uint64_t);
size -= sizeof(uint64_t);
if (supportsErrorInjection) {
dawn::native::EnableErrorInjector();
// Clear the error injector since it has the previous run's call counts.
dawn::native::ClearErrorInjector();
dawn::native::InjectErrorAt(injectedErrorIndex);
}
sAdapterSupported = AdapterSupported;
DawnProcTable procs = dawn::native::GetProcs();
// Override requestAdapter to find an adapter that the fuzzer supports.
procs.instanceRequestAdapter = [](WGPUInstance cInstance,
const WGPURequestAdapterOptions* options,
WGPURequestAdapterCallback callback, void* userdata) {
std::vector<dawn::native::Adapter> adapters = sInstance->GetAdapters();
for (dawn::native::Adapter adapter : adapters) {
if (sAdapterSupported(adapter)) {
WGPUAdapter cAdapter = adapter.Get();
dawn::native::GetProcs().adapterReference(cAdapter);
callback(WGPURequestAdapterStatus_Success, cAdapter, nullptr, userdata);
return;
}
}
callback(WGPURequestAdapterStatus_Unavailable, nullptr, "No supported adapter.", userdata);
};
dawnProcSetProcs(&procs);
DevNull devNull;
dawn::wire::WireServerDescriptor serverDesc = {};
serverDesc.procs = &procs;
serverDesc.serializer = &devNull;
std::unique_ptr<dawn::wire::WireServer> wireServer(new dawn_wire::WireServer(serverDesc));
wireServer->InjectInstance(sInstance->Get(), 1, 0);
wireServer->HandleCommands(reinterpret_cast<const char*>(data), size);
// Flush remaining callbacks to avoid memory leaks.
// TODO(crbug.com/dawn/1712): DeviceNull's APITick() will always return true so cannot
// do a polling loop here.
dawn::native::InstanceProcessEvents(sInstance->Get());
// Note: Deleting the server will release all created objects.
// Deleted devices will wait for idle on destruction.
wireServer = nullptr;
return 0;
}