| // Copyright 2020 Google LLC |
| // |
| // 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 |
| // |
| // https://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. |
| |
| // cppdap fuzzer program. |
| // Run with: ${CPPDAP_PATH}/fuzz/run.sh |
| // Requires modern clang toolchain. |
| |
| #include "content_stream.h" |
| #include "string_buffer.h" |
| |
| #include "dap/protocol.h" |
| #include "dap/session.h" |
| |
| #include <condition_variable> |
| #include <mutex> |
| |
| namespace { |
| |
| // Event provides a basic wait and signal synchronization primitive. |
| class Event { |
| public: |
| // wait() blocks until the event is fired or the given timeout is reached. |
| template <typename DURATION> |
| inline void wait(const DURATION& duration) { |
| std::unique_lock<std::mutex> lock(mutex); |
| cv.wait_for(lock, duration, [&] { return fired; }); |
| } |
| |
| // fire() sets signals the event, and unblocks any calls to wait(). |
| inline void fire() { |
| std::unique_lock<std::mutex> lock(mutex); |
| fired = true; |
| cv.notify_all(); |
| } |
| |
| private: |
| std::mutex mutex; |
| std::condition_variable cv; |
| bool fired = false; |
| }; |
| |
| } // namespace |
| |
| // List of requests that we handle for fuzzing. |
| #define DAP_REQUEST_LIST() \ |
| DAP_REQUEST(dap::AttachRequest, dap::AttachResponse) \ |
| DAP_REQUEST(dap::BreakpointLocationsRequest, \ |
| dap::BreakpointLocationsResponse) \ |
| DAP_REQUEST(dap::CancelRequest, dap::CancelResponse) \ |
| DAP_REQUEST(dap::CompletionsRequest, dap::CompletionsResponse) \ |
| DAP_REQUEST(dap::ConfigurationDoneRequest, dap::ConfigurationDoneResponse) \ |
| DAP_REQUEST(dap::ContinueRequest, dap::ContinueResponse) \ |
| DAP_REQUEST(dap::DataBreakpointInfoRequest, dap::DataBreakpointInfoResponse) \ |
| DAP_REQUEST(dap::DisassembleRequest, dap::DisassembleResponse) \ |
| DAP_REQUEST(dap::DisconnectRequest, dap::DisconnectResponse) \ |
| DAP_REQUEST(dap::EvaluateRequest, dap::EvaluateResponse) \ |
| DAP_REQUEST(dap::ExceptionInfoRequest, dap::ExceptionInfoResponse) \ |
| DAP_REQUEST(dap::GotoRequest, dap::GotoResponse) \ |
| DAP_REQUEST(dap::GotoTargetsRequest, dap::GotoTargetsResponse) \ |
| DAP_REQUEST(dap::InitializeRequest, dap::InitializeResponse) \ |
| DAP_REQUEST(dap::LaunchRequest, dap::LaunchResponse) \ |
| DAP_REQUEST(dap::LoadedSourcesRequest, dap::LoadedSourcesResponse) \ |
| DAP_REQUEST(dap::ModulesRequest, dap::ModulesResponse) \ |
| DAP_REQUEST(dap::NextRequest, dap::NextResponse) \ |
| DAP_REQUEST(dap::PauseRequest, dap::PauseResponse) \ |
| DAP_REQUEST(dap::ReadMemoryRequest, dap::ReadMemoryResponse) \ |
| DAP_REQUEST(dap::RestartFrameRequest, dap::RestartFrameResponse) \ |
| DAP_REQUEST(dap::RestartRequest, dap::RestartResponse) \ |
| DAP_REQUEST(dap::ReverseContinueRequest, dap::ReverseContinueResponse) \ |
| DAP_REQUEST(dap::RunInTerminalRequest, dap::RunInTerminalResponse) \ |
| DAP_REQUEST(dap::ScopesRequest, dap::ScopesResponse) \ |
| DAP_REQUEST(dap::SetBreakpointsRequest, dap::SetBreakpointsResponse) \ |
| DAP_REQUEST(dap::SetDataBreakpointsRequest, dap::SetDataBreakpointsResponse) \ |
| DAP_REQUEST(dap::SetExceptionBreakpointsRequest, \ |
| dap::SetExceptionBreakpointsResponse) \ |
| DAP_REQUEST(dap::SetExpressionRequest, dap::SetExpressionResponse) \ |
| DAP_REQUEST(dap::SetFunctionBreakpointsRequest, \ |
| dap::SetFunctionBreakpointsResponse) \ |
| DAP_REQUEST(dap::SetVariableRequest, dap::SetVariableResponse) \ |
| DAP_REQUEST(dap::SourceRequest, dap::SourceResponse) \ |
| DAP_REQUEST(dap::StackTraceRequest, dap::StackTraceResponse) \ |
| DAP_REQUEST(dap::StepBackRequest, dap::StepBackResponse) \ |
| DAP_REQUEST(dap::StepInRequest, dap::StepInResponse) \ |
| DAP_REQUEST(dap::StepInTargetsRequest, dap::StepInTargetsResponse) \ |
| DAP_REQUEST(dap::StepOutRequest, dap::StepOutResponse) \ |
| DAP_REQUEST(dap::TerminateRequest, dap::TerminateResponse) \ |
| DAP_REQUEST(dap::TerminateThreadsRequest, dap::TerminateThreadsResponse) \ |
| DAP_REQUEST(dap::ThreadsRequest, dap::ThreadsResponse) \ |
| DAP_REQUEST(dap::VariablesRequest, dap::VariablesResponse) |
| |
| // Fuzzing main function. |
| // See http://llvm.org/docs/LibFuzzer.html for details. |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| // The first byte can optionally control fuzzing mode. |
| enum class ControlMode { |
| // Don't wrap the input data with a stream writer. Allows testing for stream |
| // writing. |
| TestStreamWriter, |
| |
| // Don't append a 'done' request. This may cause the test to take longer to |
| // complete (it may have to block on a timeout), but exercises the |
| // unrecognised-message cases. |
| DontAppendDoneRequest, |
| |
| // Number of control modes in this enum. |
| Count, |
| }; |
| |
| // Scan first byte for control mode. |
| bool useContentStreamWriter = true; |
| bool appendDoneRequest = true; |
| if (size > 0 && data[0] < static_cast<uint8_t>(ControlMode::Count)) { |
| useContentStreamWriter = |
| data[0] != static_cast<uint8_t>(ControlMode::TestStreamWriter); |
| appendDoneRequest = |
| data[0] != static_cast<uint8_t>(ControlMode::DontAppendDoneRequest); |
| data++; |
| size--; |
| } |
| |
| // in contains the input data |
| auto in = std::make_shared<dap::StringBuffer>(); |
| |
| dap::ContentWriter writer(in); |
| if (useContentStreamWriter) { |
| writer.write(std::string(reinterpret_cast<const char*>(data), size)); |
| } else { |
| in->write(data, size); |
| } |
| |
| if (appendDoneRequest) { |
| writer.write(R"( |
| { |
| "seq": 10, |
| "type": "request", |
| "command": "done", |
| } |
| )"); |
| } |
| |
| // Each test is done if we receive a request, or report an error. |
| Event requestOrError; |
| |
| #define DAP_REQUEST(REQUEST, RESPONSE) \ |
| session->registerHandler([&](const REQUEST&) { \ |
| requestOrError.fire(); \ |
| return RESPONSE{}; \ |
| }); |
| |
| auto session = dap::Session::create(); |
| DAP_REQUEST_LIST(); |
| |
| session->onError([&](const char*) { requestOrError.fire(); }); |
| |
| auto out = std::make_shared<dap::StringBuffer>(); |
| session->bind(dap::ReaderWriter::create(in, out)); |
| |
| // Give up after a second if we don't get a request or error reported. |
| requestOrError.wait(std::chrono::seconds(1)); |
| |
| return 0; |
| } |