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GeckoChildProcessHost.cpp
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GeckoChildProcessHost.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GeckoChildProcessHost.h"
#include "base/command_line.h"
#include "base/string_util.h"
#include "base/task.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/process_watcher.h"
#ifdef MOZ_WIDGET_COCOA
# include "SharedMemoryBasic.h"
# include "base/rand_util.h"
# include "chrome/common/mach_ipc_mac.h"
# include "nsILocalFileMac.h"
#endif
#include "GeckoProfiler.h"
#include "MainThreadUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/Sprintf.h"
#include "nsXPCOMPrivate.h"
#include "prenv.h"
#if defined(MOZ_SANDBOX)
# include "mozilla/SandboxSettings.h"
# include "nsAppDirectoryServiceDefs.h"
#endif
#include <sys/stat.h>
#include "ProtocolUtils.h"
#include "mozilla/LinkedList.h"
#include "mozilla/Logging.h"
#include "mozilla/Maybe.h"
#include "mozilla/Omnijar.h"
#include "mozilla/RDDProcessHost.h"
#include "mozilla/Scoped.h"
#include "mozilla/Services.h"
#include "mozilla/SharedThreadPool.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/TaskQueue.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ipc/BrowserProcessSubThread.h"
#include "mozilla/ipc/EnvironmentMap.h"
#include "mozilla/net/SocketProcessHost.h"
#include "nsDirectoryService.h"
#include "nsDirectoryServiceDefs.h"
#include "nsExceptionHandler.h"
#include "nsIFile.h"
#include "nsIObserverService.h"
#include "nsPrintfCString.h"
#ifdef XP_WIN
# include <stdlib.h>
# include "nsIWinTaskbar.h"
# define NS_TASKBAR_CONTRACTID "@mozilla.org/windows-taskbar;1"
# if defined(MOZ_SANDBOX)
# include "WinUtils.h"
# include "mozilla/Preferences.h"
# include "mozilla/sandboxing/sandboxLogging.h"
# if defined(_ARM64_)
# include "mozilla/remoteSandboxBroker.h"
# endif
# endif
# include "mozilla/NativeNt.h"
#endif
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
# include "mozilla/SandboxLaunch.h"
#endif
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
# include "GMPProcessParent.h"
# include "nsMacUtilsImpl.h"
#endif
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "nsNativeCharsetUtils.h"
#include "nsTArray.h"
#include "nscore.h" // for NS_FREE_PERMANENT_DATA
#include "private/pprio.h"
#include "nsIThread.h"
using mozilla::MonitorAutoLock;
using mozilla::Preferences;
using mozilla::StaticMutexAutoLock;
namespace mozilla {
MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(ScopedPRFileDesc, PRFileDesc,
PR_Close)
}
using mozilla::ScopedPRFileDesc;
#ifdef MOZ_WIDGET_ANDROID
# include "AndroidBridge.h"
# include "mozilla/java/GeckoProcessManagerWrappers.h"
# include "mozilla/java/GeckoProcessTypeWrappers.h"
# include "mozilla/java/GeckoResultWrappers.h"
# include "mozilla/jni/Refs.h"
# include "mozilla/jni/Utils.h"
#endif
#ifdef MOZ_ENABLE_FORKSERVER
# include "mozilla/ipc/ForkServiceChild.h"
#endif
static bool ShouldHaveDirectoryService() {
return GeckoProcessType_Default == XRE_GetProcessType();
}
namespace mozilla {
namespace ipc {
static Atomic<int32_t> gChildCounter;
static inline nsISerialEventTarget* IOThread() {
return XRE_GetIOMessageLoop()->SerialEventTarget();
}
class BaseProcessLauncher {
public:
BaseProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: mProcessType(aHost->mProcessType),
mLaunchOptions(std::move(aHost->mLaunchOptions)),
mExtraOpts(std::move(aExtraOpts)),
#ifdef XP_WIN
mGroupId(aHost->mGroupId),
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
mAllowedFilesRead(aHost->mAllowedFilesRead),
mSandboxLevel(aHost->mSandboxLevel),
mIsFileContent(aHost->mIsFileContent),
mEnableSandboxLogging(aHost->mEnableSandboxLogging),
#endif
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
mDisableOSActivityMode(aHost->mDisableOSActivityMode),
#endif
mTmpDirName(aHost->mTmpDirName),
mChildId(++gChildCounter) {
SprintfLiteral(mPidString, "%d", base::GetCurrentProcId());
// Compute the serial event target we'll use for launching.
nsCOMPtr<nsIEventTarget> threadOrPool = GetIPCLauncher();
mLaunchThread = new TaskQueue(threadOrPool.forget());
if (ShouldHaveDirectoryService()) {
// "Current process directory" means the app dir, not the current
// working dir or similar.
mozilla::Unused
<< nsDirectoryService::gService->GetCurrentProcessDirectory(
getter_AddRefs(mAppDir));
}
}
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(BaseProcessLauncher);
RefPtr<ProcessLaunchPromise> Launch(GeckoChildProcessHost*);
protected:
virtual ~BaseProcessLauncher() = default;
RefPtr<ProcessLaunchPromise> PerformAsyncLaunch();
RefPtr<ProcessLaunchPromise> FinishLaunch();
// Overrideable hooks. If superclass behavior is invoked, it's always at the
// top of the override.
virtual bool SetChannel(IPC::Channel*) = 0;
virtual bool DoSetup();
virtual RefPtr<ProcessHandlePromise> DoLaunch() = 0;
virtual bool DoFinishLaunch() { return true; };
void MapChildLogging();
static BinPathType GetPathToBinary(FilePath&, GeckoProcessType);
void GetChildLogName(const char* origLogName, nsACString& buffer);
const char* ChildProcessType() {
return XRE_GeckoProcessTypeToString(mProcessType);
}
nsCOMPtr<nsISerialEventTarget> mLaunchThread;
GeckoProcessType mProcessType;
UniquePtr<base::LaunchOptions> mLaunchOptions;
std::vector<std::string> mExtraOpts;
#ifdef XP_WIN
nsString mGroupId;
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
std::vector<std::wstring> mAllowedFilesRead;
int32_t mSandboxLevel;
bool mIsFileContent;
bool mEnableSandboxLogging;
#endif
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
// Controls whether or not the process will be launched with
// environment variable OS_ACTIVITY_MODE set to "disabled".
bool mDisableOSActivityMode;
#endif
nsCString mTmpDirName;
LaunchResults mResults = LaunchResults();
int32_t mChildId;
TimeStamp mStartTimeStamp = TimeStamp::Now();
char mPidString[32];
// Set during launch.
IPC::Channel::ChannelId mChannelId;
ScopedPRFileDesc mCrashAnnotationReadPipe;
ScopedPRFileDesc mCrashAnnotationWritePipe;
nsCOMPtr<nsIFile> mAppDir;
};
#ifdef XP_WIN
class WindowsProcessLauncher : public BaseProcessLauncher {
public:
WindowsProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: BaseProcessLauncher(aHost, std::move(aExtraOpts)),
mProfileDir(aHost->mProfileDir),
mCachedNtdllThunk(aHost->sCachedNtDllThunk) {}
protected:
bool SetChannel(IPC::Channel*) override { return true; }
virtual bool DoSetup() override;
virtual RefPtr<ProcessHandlePromise> DoLaunch() override;
virtual bool DoFinishLaunch() override;
mozilla::Maybe<CommandLine> mCmdLine;
bool mUseSandbox = false;
nsCOMPtr<nsIFile> mProfileDir;
const StaticAutoPtr<Buffer<IMAGE_THUNK_DATA>>& mCachedNtdllThunk;
};
typedef WindowsProcessLauncher ProcessLauncher;
#endif // XP_WIN
#ifdef OS_POSIX
class PosixProcessLauncher : public BaseProcessLauncher {
public:
PosixProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: BaseProcessLauncher(aHost, std::move(aExtraOpts)),
mProfileDir(aHost->mProfileDir) {}
protected:
bool SetChannel(IPC::Channel* aChannel) override {
// The source fd is owned by the channel; take ownership by
// dup()ing it and closing the channel's copy. The destination fd
// is with respect to the not-yet-launched child process, so for
// this purpose it's just a number.
int origSrcFd;
aChannel->GetClientFileDescriptorMapping(&origSrcFd, &mChannelDstFd);
mChannelSrcFd.reset(dup(origSrcFd));
if (!mChannelSrcFd) {
return false;
}
aChannel->CloseClientFileDescriptor();
return true;
}
virtual bool DoSetup() override;
virtual RefPtr<ProcessHandlePromise> DoLaunch() override;
virtual bool DoFinishLaunch() override;
nsCOMPtr<nsIFile> mProfileDir;
std::vector<std::string> mChildArgv;
UniqueFileHandle mChannelSrcFd;
int mChannelDstFd;
};
# if defined(XP_MACOSX)
class MacProcessLauncher : public PosixProcessLauncher {
public:
MacProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: PosixProcessLauncher(aHost, std::move(aExtraOpts)),
// Put a random number into the channel name, so that
// a compromised renderer can't pretend being the child
// that's forked off.
mMachConnectionName(
StringPrintf("org.mozilla.machname.%d",
base::RandInt(0, std::numeric_limits<int>::max()))),
mParentRecvPort(mMachConnectionName.c_str()) {}
protected:
virtual bool DoFinishLaunch() override;
std::string mMachConnectionName;
// We add a mach port to the command line so the child can communicate its
// 'task_t' back to the parent.
ReceivePort mParentRecvPort;
friend class PosixProcessLauncher;
};
typedef MacProcessLauncher ProcessLauncher;
# elif defined(MOZ_WIDGET_ANDROID)
class AndroidProcessLauncher : public PosixProcessLauncher {
public:
AndroidProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: PosixProcessLauncher(aHost, std::move(aExtraOpts)) {}
protected:
virtual RefPtr<ProcessHandlePromise> DoLaunch() override;
RefPtr<ProcessHandlePromise> LaunchAndroidService(
const GeckoProcessType aType, const std::vector<std::string>& argv,
const base::file_handle_mapping_vector& fds_to_remap);
};
typedef AndroidProcessLauncher ProcessLauncher;
// NB: Technically Android is linux (i.e. XP_LINUX is defined), but we want
// orthogonal IPC machinery there. Conversely, there are tier-3 non-Linux
// platforms (BSD and Solaris) where we want the "linux" IPC machinery. So
// we use MOZ_WIDGET_* to choose the platform backend.
# elif defined(MOZ_WIDGET_GTK)
class LinuxProcessLauncher : public PosixProcessLauncher {
public:
LinuxProcessLauncher(GeckoChildProcessHost* aHost,
std::vector<std::string>&& aExtraOpts)
: PosixProcessLauncher(aHost, std::move(aExtraOpts)) {}
protected:
virtual bool DoSetup() override;
};
typedef LinuxProcessLauncher ProcessLauncher;
# elif
# error "Unknown platform"
# endif
#endif // OS_POSIX
using base::ProcessHandle;
using mozilla::ipc::BaseProcessLauncher;
using mozilla::ipc::ProcessLauncher;
mozilla::StaticAutoPtr<mozilla::LinkedList<GeckoChildProcessHost>>
GeckoChildProcessHost::sGeckoChildProcessHosts;
mozilla::StaticMutex GeckoChildProcessHost::sMutex;
#ifdef XP_WIN
mozilla::StaticAutoPtr<Buffer<IMAGE_THUNK_DATA>>
GeckoChildProcessHost::sCachedNtDllThunk;
// This static method initializes sCachedNtDllThunk. Because it's called in
// XREMain::XRE_main, which happens long before WindowsProcessLauncher's ctor
// accesses sCachedNtDllThunk, there is no race on sCachedNtDllThunk, thus
// no mutex is needed.
/* static */
void GeckoChildProcessHost::CacheNtDllThunk() {
if (sCachedNtDllThunk) {
return;
}
do {
nt::PEHeaders ourExeImage(::GetModuleHandleW(nullptr));
if (!ourExeImage) {
break;
}
nt::PEHeaders ntdllImage(::GetModuleHandleW(L"ntdll.dll"));
if (!ntdllImage) {
break;
}
Maybe<Range<const uint8_t>> ntdllBoundaries = ntdllImage.GetBounds();
if (!ntdllBoundaries) {
break;
}
Maybe<Span<IMAGE_THUNK_DATA>> maybeNtDllThunks =
ourExeImage.GetIATThunksForModule("ntdll.dll", ntdllBoundaries.ptr());
if (maybeNtDllThunks.isNothing()) {
break;
}
sCachedNtDllThunk = new Buffer<IMAGE_THUNK_DATA>(maybeNtDllThunks.value());
return;
} while (false);
// Failed to cache IAT. Initializing the variable with nullptr.
sCachedNtDllThunk = new Buffer<IMAGE_THUNK_DATA>();
}
#endif
GeckoChildProcessHost::GeckoChildProcessHost(GeckoProcessType aProcessType,
bool aIsFileContent)
: mProcessType(aProcessType),
mIsFileContent(aIsFileContent),
mMonitor("mozilla.ipc.GeckChildProcessHost.mMonitor"),
mLaunchOptions(MakeUnique<base::LaunchOptions>()),
mProcessState(CREATING_CHANNEL),
#ifdef XP_WIN
mGroupId(u"-"),
#endif
#if defined(MOZ_SANDBOX) && defined(XP_WIN)
mEnableSandboxLogging(false),
mSandboxLevel(0),
#endif
mChildProcessHandle(0),
#if defined(MOZ_WIDGET_COCOA)
mChildTask(MACH_PORT_NULL),
#endif
#if defined(MOZ_SANDBOX) && defined(XP_MACOSX)
mDisableOSActivityMode(false),
#endif
mDestroying(false) {
MOZ_COUNT_CTOR(GeckoChildProcessHost);
StaticMutexAutoLock lock(sMutex);
if (!sGeckoChildProcessHosts) {
sGeckoChildProcessHosts = new mozilla::LinkedList<GeckoChildProcessHost>();
}
sGeckoChildProcessHosts->insertBack(this);
#if defined(MOZ_SANDBOX) && defined(XP_LINUX)
// The content process needs the content temp dir:
if (aProcessType == GeckoProcessType_Content) {
nsCOMPtr<nsIFile> contentTempDir;
nsresult rv = NS_GetSpecialDirectory(NS_APP_CONTENT_PROCESS_TEMP_DIR,
getter_AddRefs(contentTempDir));
if (NS_SUCCEEDED(rv)) {
contentTempDir->GetNativePath(mTmpDirName);
}
}
#endif
#if defined(MOZ_ENABLE_FORKSERVER)
if (aProcessType == GeckoProcessType_Content && ForkServiceChild::Get()) {
mLaunchOptions->use_forkserver = true;
}
#endif
}
GeckoChildProcessHost::~GeckoChildProcessHost()
{
AssertIOThread();
MOZ_RELEASE_ASSERT(mDestroying);
MOZ_COUNT_DTOR(GeckoChildProcessHost);
if (mChildProcessHandle != 0) {
#if defined(MOZ_WIDGET_COCOA)
SharedMemoryBasic::CleanupForPidWithLock(mChildProcessHandle);
#endif
ProcessWatcher::EnsureProcessTerminated(
mChildProcessHandle
#ifdef NS_FREE_PERMANENT_DATA
// If we're doing leak logging, shutdown can be slow.
,
false // don't "force"
#endif
);
}
#if defined(MOZ_WIDGET_COCOA)
if (mChildTask != MACH_PORT_NULL)
mach_port_deallocate(mach_task_self(), mChildTask);
#endif
if (mChildProcessHandle != 0) {
#if defined(XP_WIN)
CrashReporter::DeregisterChildCrashAnnotationFileDescriptor(
base::GetProcId(mChildProcessHandle));
#else
CrashReporter::DeregisterChildCrashAnnotationFileDescriptor(
mChildProcessHandle);
#endif
}
#if defined(MOZ_SANDBOX) && defined(XP_WIN)
if (mSandboxBroker) {
mSandboxBroker->Shutdown();
mSandboxBroker = nullptr;
}
#endif
}
void GeckoChildProcessHost::RemoveFromProcessList() {
StaticMutexAutoLock lock(sMutex);
if (!sGeckoChildProcessHosts) {
return;
}
LinkedListElement<GeckoChildProcessHost>::removeFrom(
*sGeckoChildProcessHosts);
}
void GeckoChildProcessHost::Destroy() {
MOZ_RELEASE_ASSERT(!mDestroying);
// We can remove from the list before it's really destroyed
RemoveFromProcessList();
RefPtr<ProcessHandlePromise> whenReady = mHandlePromise;
if (!whenReady) {
// AsyncLaunch not called yet, so dispatch immediately.
whenReady = ProcessHandlePromise::CreateAndReject(LaunchError{}, __func__);
}
using Value = ProcessHandlePromise::ResolveOrRejectValue;
mDestroying = true;
whenReady->Then(XRE_GetIOMessageLoop()->SerialEventTarget(), __func__,
[this](const Value&) { delete this; });
}
// static
mozilla::BinPathType BaseProcessLauncher::GetPathToBinary(
FilePath& exePath, GeckoProcessType processType) {
BinPathType pathType = XRE_GetChildProcBinPathType(processType);
if (pathType == BinPathType::Self) {
#if defined(OS_WIN)
wchar_t exePathBuf[MAXPATHLEN];
if (!::GetModuleFileNameW(nullptr, exePathBuf, MAXPATHLEN)) {
MOZ_CRASH("GetModuleFileNameW failed (FIXME)");
}
# if defined(MOZ_SANDBOX)
// We need to start the child process using the real path, so that the
// sandbox policy rules will match for DLLs loaded from the bin dir after
// we have lowered the sandbox.
std::wstring exePathStr = exePathBuf;
if (widget::WinUtils::ResolveJunctionPointsAndSymLinks(exePathStr)) {
exePath = FilePath::FromWStringHack(exePathStr);
} else
# endif
{
exePath = FilePath::FromWStringHack(exePathBuf);
}
#elif defined(OS_POSIX)
exePath = FilePath(CommandLine::ForCurrentProcess()->argv()[0]);
#else
# error Sorry; target OS not supported yet.
#endif
return pathType;
}
if (ShouldHaveDirectoryService()) {
MOZ_ASSERT(gGREBinPath);
#ifdef OS_WIN
exePath = FilePath(char16ptr_t(gGREBinPath));
#elif MOZ_WIDGET_COCOA
nsCOMPtr<nsIFile> childProcPath;
NS_NewLocalFile(nsDependentString(gGREBinPath), false,
getter_AddRefs(childProcPath));
// We need to use an App Bundle on OS X so that we can hide
// the dock icon. See Bug 557225.
childProcPath->AppendNative("plugin-container.app"_ns);
childProcPath->AppendNative("Contents"_ns);
childProcPath->AppendNative("MacOS"_ns);
nsCString tempCPath;
childProcPath->GetNativePath(tempCPath);
exePath = FilePath(tempCPath.get());
#else
nsCString path;
NS_CopyUnicodeToNative(nsDependentString(gGREBinPath), path);
exePath = FilePath(path.get());
#endif
}
if (exePath.empty()) {
#ifdef OS_WIN
exePath =
FilePath::FromWStringHack(CommandLine::ForCurrentProcess()->program());
#else
exePath = FilePath(CommandLine::ForCurrentProcess()->argv()[0]);
#endif
exePath = exePath.DirName();
}
exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_NAME);
return pathType;
}
#ifdef MOZ_WIDGET_COCOA
class AutoCFTypeObject {
public:
explicit AutoCFTypeObject(CFTypeRef object) { mObject = object; }
~AutoCFTypeObject() { ::CFRelease(mObject); }
private:
CFTypeRef mObject;
};
#endif
// We start the unique IDs at 1 so that 0 can be used to mean that
// a component has no unique ID assigned to it.
uint32_t GeckoChildProcessHost::sNextUniqueID = 1;
/* static */
uint32_t GeckoChildProcessHost::GetUniqueID() { return sNextUniqueID++; }
void GeckoChildProcessHost::PrepareLaunch() {
if (CrashReporter::GetEnabled()) {
CrashReporter::OOPInit();
}
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
SandboxLaunchPrepare(mProcessType, mLaunchOptions.get());
#endif
#ifdef XP_WIN
# if defined(MOZ_SANDBOX)
// We need to get the pref here as the process is launched off main thread.
if (mProcessType == GeckoProcessType_Content) {
mSandboxLevel = GetEffectiveContentSandboxLevel();
mEnableSandboxLogging =
Preferences::GetBool("security.sandbox.logging.enabled");
// We currently have to whitelist certain paths for tests to work in some
// development configurations.
nsAutoString readPaths;
nsresult rv = Preferences::GetString(
"security.sandbox.content.read_path_whitelist", readPaths);
if (NS_SUCCEEDED(rv)) {
for (const nsAString& readPath : readPaths.Split(',')) {
nsString trimmedPath(readPath);
trimmedPath.Trim(" ", true, true);
std::wstring resolvedPath(trimmedPath.Data());
// Before resolving check if path ends with '\' as this indicates we
// want to give read access to a directory and so it needs a wildcard.
bool addWildcard = (resolvedPath.back() == L'\\');
if (!widget::WinUtils::ResolveJunctionPointsAndSymLinks(resolvedPath)) {
NS_ERROR("Failed to resolve test read policy rule.");
continue;
}
if (addWildcard) {
resolvedPath.append(L"\\*");
}
mAllowedFilesRead.push_back(resolvedPath);
}
}
}
# endif
# if defined(MOZ_SANDBOX)
// For other process types we can't rely on them being launched on main
// thread and they may not have access to prefs in the child process, so allow
// them to turn on logging via an environment variable.
mEnableSandboxLogging =
mEnableSandboxLogging || !!PR_GetEnv("MOZ_SANDBOX_LOGGING");
if (ShouldHaveDirectoryService() && mProcessType == GeckoProcessType_GPU) {
mozilla::Unused << NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(mProfileDir));
}
# endif
#elif defined(XP_MACOSX)
# if defined(MOZ_SANDBOX)
if (ShouldHaveDirectoryService() &&
mProcessType != GeckoProcessType_GMPlugin) {
mozilla::Unused << NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(mProfileDir));
}
# endif
#endif
}
#ifdef XP_WIN
void GeckoChildProcessHost::InitWindowsGroupID() {
// On Win7+, pass the application user model to the child, so it can
// register with it. This insures windows created by the container
// properly group with the parent app on the Win7 taskbar.
nsCOMPtr<nsIWinTaskbar> taskbarInfo = do_GetService(NS_TASKBAR_CONTRACTID);
if (taskbarInfo) {
bool isSupported = false;
taskbarInfo->GetAvailable(&isSupported);
nsAutoString appId;
if (isSupported && NS_SUCCEEDED(taskbarInfo->GetDefaultGroupId(appId))) {
MOZ_ASSERT(mGroupId.EqualsLiteral("-"));
mGroupId.Assign(appId);
}
}
}
#endif
bool GeckoChildProcessHost::SyncLaunch(std::vector<std::string> aExtraOpts,
int aTimeoutMs) {
if (!AsyncLaunch(std::move(aExtraOpts))) {
return false;
}
return WaitUntilConnected(aTimeoutMs);
}
// Note: for most process types, we currently call AsyncLaunch, and therefore
// the *ProcessLauncher constructor, on the main thread, while the
// ProcessLauncher methods to actually execute the launch are called on the IO
// or IPC launcher thread. GMP processes are an exception - the GMP code
// invokes GeckoChildProcessHost from non-main-threads, and therefore we cannot
// rely on having access to mainthread-only services (like the directory
// service) from this code if we're launching that type of process.
bool GeckoChildProcessHost::AsyncLaunch(std::vector<std::string> aExtraOpts) {
PrepareLaunch();
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
if (IsMacSandboxLaunchEnabled() && !AppendMacSandboxParams(aExtraOpts)) {
return false;
}
#endif
RefPtr<BaseProcessLauncher> launcher =
new ProcessLauncher(this, std::move(aExtraOpts));
// Note: Destroy() waits on mHandlePromise to delete |this|. As such, we want
// to be sure that all of our post-launch processing on |this| happens before
// mHandlePromise notifies.
MOZ_ASSERT(mHandlePromise == nullptr);
mHandlePromise =
mozilla::InvokeAsync<GeckoChildProcessHost*>(
IOThread(), launcher.get(), __func__, &BaseProcessLauncher::Launch,
this)
->Then(
IOThread(), __func__,
[this](const LaunchResults& aResults) {
{
if (!OpenPrivilegedHandle(base::GetProcId(aResults.mHandle))
#ifdef XP_WIN
// If we failed in opening the process handle, try harder
// by duplicating one.
&& !::DuplicateHandle(
::GetCurrentProcess(), aResults.mHandle,
::GetCurrentProcess(), &mChildProcessHandle,
PROCESS_DUP_HANDLE | PROCESS_TERMINATE |
PROCESS_QUERY_INFORMATION | PROCESS_VM_READ |
SYNCHRONIZE,
FALSE, 0)
#endif // XP_WIN
) {
MOZ_CRASH("cannot open handle to child process");
}
#ifdef XP_MACOSX
this->mChildTask = aResults.mChildTask;
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
this->mSandboxBroker = aResults.mSandboxBroker;
#endif
MonitorAutoLock lock(mMonitor);
// The OnChannel{Connected,Error} may have already advanced
// the state.
if (mProcessState < PROCESS_CREATED) {
mProcessState = PROCESS_CREATED;
}
lock.Notify();
}
return ProcessHandlePromise::CreateAndResolve(aResults.mHandle,
__func__);
},
[this](const LaunchError aError) {
// WaitUntilConnected might be waiting for us to signal.
// If something failed let's set the error state and notify.
CHROMIUM_LOG(ERROR)
<< "Failed to launch "
<< XRE_GeckoProcessTypeToString(mProcessType)
<< " subprocess";
Telemetry::Accumulate(
Telemetry::SUBPROCESS_LAUNCH_FAILURE,
nsDependentCString(
XRE_GeckoProcessTypeToString(mProcessType)));
{
MonitorAutoLock lock(mMonitor);
mProcessState = PROCESS_ERROR;
lock.Notify();
}
return ProcessHandlePromise::CreateAndReject(aError, __func__);
});
return true;
}
bool GeckoChildProcessHost::WaitUntilConnected(int32_t aTimeoutMs) {
AUTO_PROFILER_LABEL("GeckoChildProcessHost::WaitUntilConnected", OTHER);
// NB: this uses a different mechanism than the chromium parent
// class.
TimeDuration timeout = (aTimeoutMs > 0)
? TimeDuration::FromMilliseconds(aTimeoutMs)
: TimeDuration::Forever();
MonitorAutoLock lock(mMonitor);
TimeStamp waitStart = TimeStamp::Now();
TimeStamp current;
// We'll receive several notifications, we need to exit when we
// have either successfully launched or have timed out.
while (mProcessState != PROCESS_CONNECTED) {
// If there was an error then return it, don't wait out the timeout.
if (mProcessState == PROCESS_ERROR) {
break;
}
CVStatus status = lock.Wait(timeout);
if (status == CVStatus::Timeout) {
break;
}
if (timeout != TimeDuration::Forever()) {
current = TimeStamp::Now();
timeout -= current - waitStart;
waitStart = current;
}
}
return mProcessState == PROCESS_CONNECTED;
}
bool GeckoChildProcessHost::WaitForProcessHandle() {
MonitorAutoLock lock(mMonitor);
while (mProcessState < PROCESS_CREATED) {
lock.Wait();
}
MOZ_ASSERT(mProcessState == PROCESS_ERROR || mChildProcessHandle);
return mProcessState < PROCESS_ERROR;
}
bool GeckoChildProcessHost::LaunchAndWaitForProcessHandle(
StringVector aExtraOpts) {
if (!AsyncLaunch(std::move(aExtraOpts))) {
return false;
}
return WaitForProcessHandle();
}
void GeckoChildProcessHost::InitializeChannel() {
CreateChannel();
MonitorAutoLock lock(mMonitor);
mProcessState = CHANNEL_INITIALIZED;
lock.Notify();
}
void GeckoChildProcessHost::Join() {
AssertIOThread();
if (!mChildProcessHandle) {
return;
}
// If this fails, there's nothing we can do.
base::KillProcess(mChildProcessHandle, 0, /*wait*/ true);
SetAlreadyDead();
}
void GeckoChildProcessHost::SetAlreadyDead() {
if (mChildProcessHandle && mChildProcessHandle != kInvalidProcessHandle) {
base::CloseProcessHandle(mChildProcessHandle);
}
mChildProcessHandle = 0;
}
void BaseProcessLauncher::GetChildLogName(const char* origLogName,
nsACString& buffer) {
#ifdef XP_WIN
// On Windows we must expand relative paths because sandboxing rules
// bound only to full paths. fopen fowards to NtCreateFile which checks
// the path against the sanboxing rules as passed to fopen (left relative).
char absPath[MAX_PATH + 2];
if (_fullpath(absPath, origLogName, sizeof(absPath))) {
# ifdef MOZ_SANDBOX
// We need to make sure the child log name doesn't contain any junction
// points or symlinks or the sandbox will reject rules to allow writing.
std::wstring resolvedPath(NS_ConvertUTF8toUTF16(absPath).get());
if (widget::WinUtils::ResolveJunctionPointsAndSymLinks(resolvedPath)) {
AppendUTF16toUTF8(
Span(reinterpret_cast<const char16_t*>(resolvedPath.data()),
resolvedPath.size()),
buffer);
} else
# endif
{
buffer.Append(absPath);
}
} else
#endif
{
buffer.Append(origLogName);
}
// Remove .moz_log extension to avoid its duplication, it will be added
// automatically by the logging backend
static constexpr auto kMozLogExt = nsLiteralCString{MOZ_LOG_FILE_EXTENSION};
if (StringEndsWith(buffer, kMozLogExt)) {
buffer.Truncate(buffer.Length() - kMozLogExt.Length());
}
// Append child-specific postfix to name
buffer.AppendLiteral(".child-");
buffer.AppendInt(gChildCounter);
}
// Windows needs a single dedicated thread for process launching,
// because of thread-safety restrictions/assertions in the sandbox
// code.
//
// Android also needs a single dedicated thread to simplify thread
// safety in java.
//
// Fork server needs a dedicated thread for accessing
// |ForkServiceChild|.
#if defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID) || \
defined(MOZ_ENABLE_FORKSERVER)
static mozilla::StaticMutex gIPCLaunchThreadMutex;
static mozilla::StaticRefPtr<nsIThread> gIPCLaunchThread;
class IPCLaunchThreadObserver final : public nsIObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
protected:
virtual ~IPCLaunchThreadObserver() = default;
};
NS_IMPL_ISUPPORTS(IPCLaunchThreadObserver, nsIObserver, nsISupports)
NS_IMETHODIMP
IPCLaunchThreadObserver::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_RELEASE_ASSERT(strcmp(aTopic, "xpcom-shutdown-threads") == 0);
StaticMutexAutoLock lock(gIPCLaunchThreadMutex);
nsresult rv = NS_OK;
if (gIPCLaunchThread) {
rv = gIPCLaunchThread->Shutdown();
gIPCLaunchThread = nullptr;
}
mozilla::Unused << NS_WARN_IF(NS_FAILED(rv));
return rv;
}
nsCOMPtr<nsIEventTarget> GetIPCLauncher() {
StaticMutexAutoLock lock(gIPCLaunchThreadMutex);
if (!gIPCLaunchThread) {
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_NewNamedThread("IPC Launch"_ns, getter_AddRefs(thread));
if (!NS_WARN_IF(NS_FAILED(rv))) {
NS_DispatchToMainThread(
NS_NewRunnableFunction("GeckoChildProcessHost::GetIPCLauncher", [] {
nsCOMPtr<nsIObserverService> obsService =
mozilla::services::GetObserverService();
nsCOMPtr<nsIObserver> obs = new IPCLaunchThreadObserver();
obsService->AddObserver(obs, "xpcom-shutdown-threads", false);
}));
gIPCLaunchThread = thread.forget();
}
}
nsCOMPtr<nsIEventTarget> thread = gIPCLaunchThread.get();
MOZ_DIAGNOSTIC_ASSERT(thread);
return thread;
}
#else // defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID) ||
// defined(MOZ_ENABLE_FORKSERVER)
// Other platforms use an on-demand thread pool.
nsCOMPtr<nsIEventTarget> GetIPCLauncher() {
nsCOMPtr<nsIEventTarget> pool =
mozilla::SharedThreadPool::Get("IPC Launch"_ns);
MOZ_DIAGNOSTIC_ASSERT(pool);
return pool;
}
#endif // XP_WIN || MOZ_WIDGET_ANDROID || MOZ_ENABLE_FORKSERVER
void
#if defined(XP_WIN)
AddAppDirToCommandLine(CommandLine& aCmdLine, nsIFile* aAppDir)
#else
AddAppDirToCommandLine(std::vector<std::string>& aCmdLine, nsIFile* aAppDir,
nsIFile* aProfileDir)
#endif
{
// Content processes need access to application resources, so pass
// the full application directory path to the child process.
if (aAppDir) {
#if defined(XP_WIN)
nsString path;
MOZ_ALWAYS_SUCCEEDS(aAppDir->GetPath(path));
aCmdLine.AppendLooseValue(UTF8ToWide("-appdir"));
std::wstring wpath(path.get());
aCmdLine.AppendLooseValue(wpath);
#else
nsAutoCString path;
MOZ_ALWAYS_SUCCEEDS(aAppDir->GetNativePath(path));
aCmdLine.push_back("-appdir");
aCmdLine.push_back(path.get());
#endif