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utility_main.cc
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/leak_annotations.h"
#include "base/message_loop/message_pump_type.h"
#include "base/optional.h"
#include "base/power_monitor/power_monitor.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_executor.h"
#include "base/threading/platform_thread.h"
#include "base/timer/hi_res_timer_manager.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "content/child/child_process.h"
#include "content/common/content_switches_internal.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "content/public/common/sandbox_init.h"
#include "content/public/utility/content_utility_client.h"
#include "content/utility/utility_thread_impl.h"
#include "sandbox/policy/sandbox.h"
#include "services/tracing/public/cpp/trace_startup.h"
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
#include "content/utility/speech/speech_recognition_sandbox_hook_linux.h"
#include "sandbox/policy/linux/sandbox_linux.h"
#include "services/audio/audio_sandbox_hook_linux.h"
#include "services/network/network_sandbox_hook_linux.h"
#endif
#if BUILDFLAG(IS_CHROMEOS_ASH)
#include "chromeos/services/ime/ime_sandbox_hook.h"
#include "chromeos/services/tts/tts_sandbox_hook.h"
#endif
#if defined(OS_MAC)
#include "base/message_loop/message_pump_mac.h"
#endif
#if defined(OS_WIN)
#include "base/rand_util.h"
#include "sandbox/win/src/sandbox.h"
sandbox::TargetServices* g_utility_target_services = nullptr;
#endif
namespace content {
// Mainline routine for running as the utility process.
int UtilityMain(const MainFunctionParams& parameters) {
base::MessagePumpType message_pump_type =
parameters.command_line.HasSwitch(switches::kMessageLoopTypeUi)
? base::MessagePumpType::UI
: base::MessagePumpType::DEFAULT;
#if defined(OS_MAC)
auto sandbox_type =
sandbox::policy::SandboxTypeFromCommandLine(parameters.command_line);
if (sandbox_type != sandbox::policy::SandboxType::kNoSandbox) {
// On Mac, the TYPE_UI pump for the main thread is an NSApplication loop.
// In a sandboxed utility process, NSApp attempts to acquire more Mach
// resources than a restrictive sandbox policy should allow. Services that
// require a TYPE_UI pump generally just need a NS/CFRunLoop to pump system
// work sources, so choose that pump type instead. A NSRunLoop MessagePump
// is used for TYPE_UI MessageLoops on non-main threads.
base::MessagePump::OverrideMessagePumpForUIFactory(
[]() -> std::unique_ptr<base::MessagePump> {
return std::make_unique<base::MessagePumpNSRunLoop>();
});
}
#endif
#if defined(OS_FUCHSIA)
// On Fuchsia always use IO threads to allow FIDL calls.
if (message_pump_type == base::MessagePumpType::DEFAULT)
message_pump_type = base::MessagePumpType::IO;
#endif // defined(OS_FUCHSIA)
// The main task executor of the utility process.
base::SingleThreadTaskExecutor main_thread_task_executor(message_pump_type);
base::PlatformThread::SetName("CrUtilityMain");
if (parameters.command_line.HasSwitch(switches::kUtilityStartupDialog))
WaitForDebugger("Utility");
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
// Initializes the sandbox before any threads are created.
// TODO(jorgelo): move this after GTK initialization when we enable a strict
// Seccomp-BPF policy.
auto sandbox_type =
sandbox::policy::SandboxTypeFromCommandLine(parameters.command_line);
if (parameters.zygote_child ||
sandbox_type == sandbox::policy::SandboxType::kNetwork ||
#if BUILDFLAG(IS_CHROMEOS_ASH)
sandbox_type == sandbox::policy::SandboxType::kIme ||
sandbox_type == sandbox::policy::SandboxType::kTts ||
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
sandbox_type == sandbox::policy::SandboxType::kAudio ||
sandbox_type == sandbox::policy::SandboxType::kSpeechRecognition) {
sandbox::policy::SandboxLinux::PreSandboxHook pre_sandbox_hook;
if (sandbox_type == sandbox::policy::SandboxType::kNetwork)
pre_sandbox_hook = base::BindOnce(&network::NetworkPreSandboxHook);
else if (sandbox_type == sandbox::policy::SandboxType::kAudio)
pre_sandbox_hook = base::BindOnce(&audio::AudioPreSandboxHook);
else if (sandbox_type == sandbox::policy::SandboxType::kSpeechRecognition)
pre_sandbox_hook =
base::BindOnce(&speech::SpeechRecognitionPreSandboxHook);
#if BUILDFLAG(IS_CHROMEOS_ASH)
else if (sandbox_type == sandbox::policy::SandboxType::kIme)
pre_sandbox_hook = base::BindOnce(&chromeos::ime::ImePreSandboxHook);
else if (sandbox_type == sandbox::policy::SandboxType::kTts)
pre_sandbox_hook = base::BindOnce(&chromeos::tts::TtsPreSandboxHook);
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
sandbox::policy::Sandbox::Initialize(
sandbox_type, std::move(pre_sandbox_hook),
sandbox::policy::SandboxLinux::Options());
}
#elif defined(OS_WIN)
g_utility_target_services = parameters.sandbox_info->target_services;
#endif
ChildProcess utility_process;
GetContentClient()->utility()->PostIOThreadCreated(
utility_process.io_task_runner());
base::RunLoop run_loop;
utility_process.set_main_thread(
new UtilityThreadImpl(run_loop.QuitClosure()));
#if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MAC)
// Startup tracing is usually enabled earlier, but if we forked from a zygote,
// we can only enable it after mojo IPC support is brought up initialized by
// UtilityThreadImpl, because the mojo broker has to create the tracing SMB on
// our behalf due to the zygote sandbox.
if (parameters.zygote_child)
tracing::EnableStartupTracingIfNeeded();
#endif // OS_POSIX && !OS_ANDROID && !OS_MAC
// Both utility process and service utility process would come
// here, but the later is launched without connection to service manager, so
// there has no base::PowerMonitor be created(See ChildThreadImpl::Init()).
// As base::PowerMonitor is necessary to base::HighResolutionTimerManager, for
// such case we just disable base::HighResolutionTimerManager for now.
// Note that disabling base::HighResolutionTimerManager means high resolution
// timer is always disabled no matter on battery or not, but it should have
// no any bad influence because currently service utility process is not using
// any high resolution timer.
// TODO(leonhsl): Once http://crbug.com/646833 got resolved, re-enable
// base::HighResolutionTimerManager here for future possible usage of high
// resolution timer in service utility process.
base::Optional<base::HighResolutionTimerManager> hi_res_timer_manager;
if (base::PowerMonitor::IsInitialized()) {
hi_res_timer_manager.emplace();
}
#if defined(OS_WIN)
auto sandbox_type =
sandbox::policy::SandboxTypeFromCommandLine(parameters.command_line);
// https://crbug.com/1076771 https://crbug.com/1075487 Premature unload of
// shell32 caused process to crash during process shutdown.
HMODULE shell32_pin = ::LoadLibrary(L"shell32.dll");
UNREFERENCED_PARAMETER(shell32_pin);
if (!sandbox::policy::IsUnsandboxedSandboxType(sandbox_type) &&
sandbox_type != sandbox::policy::SandboxType::kCdm) {
if (!g_utility_target_services)
return false;
char buffer;
// Ensure RtlGenRandom is warm before the token is lowered; otherwise,
// base::RandBytes() will CHECK fail when v8 is initialized.
base::RandBytes(&buffer, sizeof(buffer));
if (sandbox_type == sandbox::policy::SandboxType::kNetwork) {
// Network service process needs FWPUCLNT.DLL to be loaded before sandbox
// lockdown otherwise getaddrinfo fails.
HMODULE fwpuclnt_pin = ::LoadLibrary(L"FWPUCLNT.DLL");
UNREFERENCED_PARAMETER(fwpuclnt_pin);
// Network service process needs urlmon.dll to be loaded before sandbox
// lockdown otherwise CoInternetCreateSecurityManager fails.
HMODULE urlmon_pin = ::LoadLibrary(L"urlmon.dll");
UNREFERENCED_PARAMETER(urlmon_pin);
}
g_utility_target_services->LowerToken();
}
#endif
run_loop.Run();
#if defined(LEAK_SANITIZER)
// Invoke LeakSanitizer before shutting down the utility thread, to avoid
// reporting shutdown-only leaks.
__lsan_do_leak_check();
#endif
return 0;
}
} // namespace content