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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 "DawnWireServerFuzzer.h"
#include "common/Assert.h"
#include "common/Log.h"
#include "common/SystemUtils.h"
#include "dawn/dawn_proc.h"
#include "dawn/webgpu_cpp.h"
#include "dawn_native/DawnNative.h"
#include "dawn_wire/WireServer.h"
#include "utils/SystemUtils.h"
#include <fstream>
#include <vector>
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;
WGPUProcDeviceCreateSwapChain sOriginalDeviceCreateSwapChain = nullptr;
bool sCommandsComplete = false;
WGPUSwapChain ErrorDeviceCreateSwapChain(WGPUDevice device,
WGPUSurface surface,
const WGPUSwapChainDescriptor*) {
WGPUSwapChainDescriptor desc = {};
// A 0 implementation will trigger a swapchain creation error.
desc.implementation = 0;
return sOriginalDeviceCreateSwapChain(device, surface, &desc);
}
} // 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>();
sInstance->DiscoverDefaultAdapters();
return 0;
}
int DawnWireServerFuzzer::Run(const uint8_t* data,
size_t size,
MakeDeviceFn MakeDevice,
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);
}
DawnProcTable procs = dawn_native::GetProcs();
// Swapchains receive a pointer to an implementation. The fuzzer will pass garbage in so we
// intercept calls to create swapchains and make sure they always return error swapchains.
// This is ok for fuzzing because embedders of dawn_wire would always define their own
// swapchain handling.
sOriginalDeviceCreateSwapChain = procs.deviceCreateSwapChain;
procs.deviceCreateSwapChain = ErrorDeviceCreateSwapChain;
dawnProcSetProcs(&procs);
wgpu::Device device = MakeDevice(sInstance.get());
if (!device) {
// We should only ever fail device creation if an error was injected.
ASSERT(supportsErrorInjection);
return 0;
}
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->InjectDevice(device.Get(), 1, 0);
wireServer->HandleCommands(reinterpret_cast<const char*>(data), size);
// Wait for all previous commands before destroying the server.
// TODO(enga): Improve this when we improve/finalize how processing events happens.
{
device.GetQueue().OnSubmittedWorkDone(
0u, [](WGPUQueueWorkDoneStatus, void*) { sCommandsComplete = true; }, nullptr);
while (!sCommandsComplete) {
device.Tick();
utils::USleep(100);
}
}
wireServer = nullptr;
return 0;
}