245 lines
9 KiB
C++
245 lines
9 KiB
C++
// Copyright (c) 2022 Slack Technologies, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include <windows.h> // windows.h must be included first
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#include <atlbase.h> // ensures that ATL statics like `_AtlWinModule` are initialized (it's an issue in static debug build)
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#include <shellapi.h>
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#include <shellscalingapi.h>
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#include <tchar.h>
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#include <algorithm>
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#include <cstdlib>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "base/at_exit.h"
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#include "base/environment.h"
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#include "base/i18n/icu_util.h"
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#include "base/process/launch.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/win/dark_mode_support.h"
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#include "base/win/windows_version.h"
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#include "components/browser_watcher/exit_code_watcher_win.h"
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#include "components/crash/core/app/crash_switches.h"
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#include "components/crash/core/app/run_as_crashpad_handler_win.h"
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#include "content/public/app/content_main.h"
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#include "content/public/app/sandbox_helper_win.h"
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#include "electron/buildflags/buildflags.h"
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#include "electron/fuses.h"
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#include "sandbox/win/src/sandbox_types.h"
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#include "shell/app/command_line_args.h"
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#include "shell/app/electron_main_delegate.h"
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#include "shell/app/node_main.h"
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#include "shell/common/electron_command_line.h"
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#include "shell/common/electron_constants.h"
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#include "third_party/crashpad/crashpad/util/win/initial_client_data.h"
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namespace {
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// Redefined here so we don't have to introduce a dependency on //content
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// from //electron:electron_app
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const char kUserDataDir[] = "user-data-dir";
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const char kProcessType[] = "type";
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[[maybe_unused]] bool IsEnvSet(const char* name) {
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size_t required_size;
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getenv_s(&required_size, nullptr, 0, name);
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return required_size != 0;
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}
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} // namespace
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namespace crash_reporter {
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extern const char kCrashpadProcess[];
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}
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// In 32-bit builds, the main thread starts with the default (small) stack size.
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// The ARCH_CPU_32_BITS blocks here and below are in support of moving the main
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// thread to a fiber with a larger stack size.
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#if defined(ARCH_CPU_32_BITS)
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// The information needed to transfer control to the large-stack fiber and later
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// pass the main routine's exit code back to the small-stack fiber prior to
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// termination.
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struct FiberState {
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HINSTANCE instance;
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LPVOID original_fiber;
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int fiber_result;
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};
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// A PFIBER_START_ROUTINE function run on a large-stack fiber that calls the
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// main routine, stores its return value, and returns control to the small-stack
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// fiber. |params| must be a pointer to a FiberState struct.
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void WINAPI FiberBinder(void* params) {
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auto* fiber_state = static_cast<FiberState*>(params);
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// Call the wWinMain routine from the fiber. Reusing the entry point minimizes
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// confusion when examining call stacks in crash reports - seeing wWinMain on
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// the stack is a handy hint that this is the main thread of the process.
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fiber_state->fiber_result =
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wWinMain(fiber_state->instance, nullptr, nullptr, 0);
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// Switch back to the main thread to exit.
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::SwitchToFiber(fiber_state->original_fiber);
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}
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#endif // defined(ARCH_CPU_32_BITS)
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int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t* cmd, int) {
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#if defined(ARCH_CPU_32_BITS)
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enum class FiberStatus { kConvertFailed, kCreateFiberFailed, kSuccess };
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FiberStatus fiber_status = FiberStatus::kSuccess;
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// GetLastError result if fiber conversion failed.
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DWORD fiber_error = ERROR_SUCCESS;
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if (!::IsThreadAFiber()) {
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// Make the main thread's stack size 4 MiB so that it has roughly the same
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// effective size as the 64-bit build's 8 MiB stack.
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constexpr size_t kStackSize = 4 * 1024 * 1024; // 4 MiB
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// Leak the fiber on exit.
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LPVOID original_fiber =
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::ConvertThreadToFiberEx(nullptr, FIBER_FLAG_FLOAT_SWITCH);
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if (original_fiber) {
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FiberState fiber_state = {instance, original_fiber};
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// Create a fiber with a bigger stack and switch to it. Leak the fiber on
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// exit.
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LPVOID big_stack_fiber = ::CreateFiberEx(
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0, kStackSize, FIBER_FLAG_FLOAT_SWITCH, FiberBinder, &fiber_state);
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if (big_stack_fiber) {
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::SwitchToFiber(big_stack_fiber);
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// The fibers must be cleaned up to avoid obscure TLS-related shutdown
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// crashes.
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::DeleteFiber(big_stack_fiber);
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::ConvertFiberToThread();
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// Control returns here after Chrome has finished running on FiberMain.
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return fiber_state.fiber_result;
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}
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fiber_status = FiberStatus::kCreateFiberFailed;
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} else {
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fiber_status = FiberStatus::kConvertFailed;
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}
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// If we reach here then creating and switching to a fiber has failed. This
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// probably means we are low on memory and will soon crash. Try to report
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// this error once crash reporting is initialized.
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fiber_error = ::GetLastError();
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base::debug::Alias(&fiber_error);
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}
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// If we are already a fiber then continue normal execution.
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#endif // defined(ARCH_CPU_32_BITS)
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struct Arguments {
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int argc = 0;
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wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
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~Arguments() { LocalFree(argv); }
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} arguments;
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if (!arguments.argv)
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return -1;
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#ifdef _DEBUG
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// Don't display assert dialog boxes in CI test runs
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static const char kCI[] = "CI";
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if (IsEnvSet(kCI)) {
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_CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
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_CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
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_CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG | _CRTDBG_MODE_FILE);
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_CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
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_set_error_mode(_OUT_TO_STDERR);
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}
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#endif
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#if BUILDFLAG(ENABLE_RUN_AS_NODE)
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bool run_as_node =
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electron::fuses::IsRunAsNodeEnabled() && IsEnvSet(electron::kRunAsNode);
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#else
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bool run_as_node = false;
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#endif
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// Make sure the output is printed to console.
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if (run_as_node || !IsEnvSet("ELECTRON_NO_ATTACH_CONSOLE"))
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base::RouteStdioToConsole(false);
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std::vector<char*> argv(arguments.argc);
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std::transform(arguments.argv, arguments.argv + arguments.argc, argv.begin(),
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[](auto& a) { return _strdup(base::WideToUTF8(a).c_str()); });
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#if BUILDFLAG(ENABLE_RUN_AS_NODE)
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if (electron::fuses::IsRunAsNodeEnabled() && run_as_node) {
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base::AtExitManager atexit_manager;
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base::i18n::InitializeICU();
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auto ret = electron::NodeMain(argv.size(), argv.data());
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std::for_each(argv.begin(), argv.end(), free);
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return ret;
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}
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#endif
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base::CommandLine::Init(argv.size(), argv.data());
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const base::CommandLine* command_line =
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base::CommandLine::ForCurrentProcess();
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const std::string process_type =
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command_line->GetSwitchValueASCII(kProcessType);
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if (process_type == crash_reporter::switches::kCrashpadHandler) {
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// Check if we should monitor the exit code of this process
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std::unique_ptr<browser_watcher::ExitCodeWatcher> exit_code_watcher;
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// Retrieve the client process from the command line
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crashpad::InitialClientData initial_client_data;
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if (initial_client_data.InitializeFromString(
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command_line->GetSwitchValueASCII("initial-client-data"))) {
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// Setup exit code watcher to monitor the parent process
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HANDLE duplicate_handle = INVALID_HANDLE_VALUE;
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if (DuplicateHandle(
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::GetCurrentProcess(), initial_client_data.client_process(),
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::GetCurrentProcess(), &duplicate_handle,
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PROCESS_QUERY_INFORMATION, FALSE, DUPLICATE_SAME_ACCESS)) {
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base::Process parent_process(duplicate_handle);
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exit_code_watcher =
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std::make_unique<browser_watcher::ExitCodeWatcher>();
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if (exit_code_watcher->Initialize(std::move(parent_process))) {
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exit_code_watcher->StartWatching();
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}
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}
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}
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// The handler process must always be passed the user data dir on the
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// command line.
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DCHECK(command_line->HasSwitch(kUserDataDir));
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base::FilePath user_data_dir =
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command_line->GetSwitchValuePath(kUserDataDir);
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int crashpad_status = crash_reporter::RunAsCrashpadHandler(
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*command_line, user_data_dir, kProcessType, kUserDataDir);
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if (crashpad_status != 0 && exit_code_watcher) {
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// Crashpad failed to initialize, explicitly stop the exit code watcher
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// so the crashpad-handler process can exit with an error
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exit_code_watcher->StopWatching();
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}
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return crashpad_status;
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}
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#if BUILDFLAG(IS_WIN)
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// access ui native theme here to prevent blocking calls later
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base::win::AllowDarkModeForApp(true);
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#endif
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#if defined(ARCH_CPU_32_BITS)
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// Intentionally crash if converting to a fiber failed.
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CHECK_EQ(fiber_status, FiberStatus::kSuccess);
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#endif // defined(ARCH_CPU_32_BITS)
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if (!electron::CheckCommandLineArguments(arguments.argc, arguments.argv))
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return -1;
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sandbox::SandboxInterfaceInfo sandbox_info = {nullptr};
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content::InitializeSandboxInfo(&sandbox_info);
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electron::ElectronMainDelegate delegate;
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content::ContentMainParams params(&delegate);
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params.instance = instance;
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params.sandbox_info = &sandbox_info;
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electron::ElectronCommandLine::Init(arguments.argc, arguments.argv);
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return content::ContentMain(std::move(params));
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}
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