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gecko-dev/ipc/glue/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 "chrome/common/mach_ipc_mac.h"
#include "base/rand_util.h"
#include "nsILocalFileMac.h"
#include "SharedMemoryBasic.h"
#endif
#include "MainThreadUtils.h"
#include "mozilla/Sprintf.h"
#include "prenv.h"
#include "nsXPCOMPrivate.h"
#if defined(XP_MACOSX) && defined(MOZ_CONTENT_SANDBOX)
#include "nsAppDirectoryServiceDefs.h"
#endif
#include "nsExceptionHandler.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIFile.h"
#include "nsPrintfCString.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ipc/BrowserProcessSubThread.h"
#include "mozilla/Omnijar.h"
#include "mozilla/Telemetry.h"
#include "ProtocolUtils.h"
#include <sys/stat.h>
#ifdef XP_WIN
#include "nsIWinTaskbar.h"
#define NS_TASKBAR_CONTRACTID "@mozilla.org/windows-taskbar;1"
#if defined(MOZ_SANDBOX)
#include "mozilla/Preferences.h"
#include "mozilla/sandboxing/sandboxLogging.h"
#include "nsDirectoryServiceUtils.h"
#endif
#endif
#include "nsTArray.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "nsNativeCharsetUtils.h"
#include "nscore.h" // for NS_FREE_PERMANENT_DATA
using mozilla::MonitorAutoLock;
using mozilla::ipc::GeckoChildProcessHost;
#ifdef ANDROID
// Like its predecessor in nsExceptionHandler.cpp, this is
// the magic number of a file descriptor remapping we must
// preserve for the child process.
static const int kMagicAndroidSystemPropFd = 5;
#endif
#ifdef MOZ_WIDGET_ANDROID
#include "AndroidBridge.h"
#endif
static const bool kLowRightsSubprocesses =
// We currently only attempt to drop privileges on gonk, because we
// have no plugins or extensions to worry about breaking.
#ifdef MOZ_WIDGET_GONK
true
#else
false
#endif
;
static bool
ShouldHaveDirectoryService()
{
return GeckoProcessType_Default == XRE_GetProcessType();
}
/*static*/
base::ChildPrivileges
GeckoChildProcessHost::DefaultChildPrivileges()
{
return (kLowRightsSubprocesses ?
base::PRIVILEGES_UNPRIVILEGED : base::PRIVILEGES_INHERIT);
}
GeckoChildProcessHost::GeckoChildProcessHost(GeckoProcessType aProcessType,
ChildPrivileges aPrivileges)
: mProcessType(aProcessType),
mPrivileges(aPrivileges),
mMonitor("mozilla.ipc.GeckChildProcessHost.mMonitor"),
mProcessState(CREATING_CHANNEL),
#if defined(MOZ_SANDBOX) && defined(XP_WIN)
mEnableSandboxLogging(false),
mSandboxLevel(0),
#endif
mChildProcessHandle(0)
#if defined(MOZ_WIDGET_COCOA)
, mChildTask(MACH_PORT_NULL)
#endif
{
MOZ_COUNT_CTOR(GeckoChildProcessHost);
}
GeckoChildProcessHost::~GeckoChildProcessHost()
{
AssertIOThread();
MOZ_COUNT_DTOR(GeckoChildProcessHost);
if (mChildProcessHandle > 0) {
#if defined(MOZ_WIDGET_COCOA)
SharedMemoryBasic::CleanupForPid(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
}
//static
auto
GeckoChildProcessHost::GetPathToBinary(FilePath& exePath, GeckoProcessType processType) -> BinaryPathType
{
if (sRunSelfAsContentProc &&
(processType == GeckoProcessType_Content || processType == GeckoProcessType_GPU)) {
#if defined(OS_WIN)
wchar_t exePathBuf[MAXPATHLEN];
if (!::GetModuleFileNameW(nullptr, exePathBuf, MAXPATHLEN)) {
MOZ_CRASH("GetModuleFileNameW failed (FIXME)");
}
exePath = FilePath::FromWStringHack(exePathBuf);
#elif defined(OS_POSIX)
exePath = FilePath(CommandLine::ForCurrentProcess()->argv()[0]);
#else
# error Sorry; target OS not supported yet.
#endif
return BinaryPathType::Self;
}
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(NS_LITERAL_CSTRING("plugin-container.app"));
childProcPath->AppendNative(NS_LITERAL_CSTRING("Contents"));
childProcPath->AppendNative(NS_LITERAL_CSTRING("MacOS"));
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();
}
#ifdef MOZ_WIDGET_ANDROID
exePath = exePath.AppendASCII("lib");
// We must use the PIE binary on 5.0 and higher
const char* processName = mozilla::AndroidBridge::Bridge()->GetAPIVersion() >= 21 ?
MOZ_CHILD_PROCESS_NAME_PIE : MOZ_CHILD_PROCESS_NAME;
exePath = exePath.AppendASCII(processName);
#else
exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_NAME);
#endif
return BinaryPathType::PluginContainer;
}
#ifdef MOZ_WIDGET_COCOA
class AutoCFTypeObject {
public:
explicit AutoCFTypeObject(CFTypeRef object)
{
mObject = object;
}
~AutoCFTypeObject()
{
::CFRelease(mObject);
}
private:
CFTypeRef mObject;
};
#endif
nsresult GeckoChildProcessHost::GetArchitecturesForBinary(const char *path, uint32_t *result)
{
*result = 0;
#ifdef MOZ_WIDGET_COCOA
CFURLRef url = ::CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
(const UInt8*)path,
strlen(path),
false);
if (!url) {
return NS_ERROR_FAILURE;
}
AutoCFTypeObject autoPluginContainerURL(url);
CFArrayRef pluginContainerArchs = ::CFBundleCopyExecutableArchitecturesForURL(url);
if (!pluginContainerArchs) {
return NS_ERROR_FAILURE;
}
AutoCFTypeObject autoPluginContainerArchs(pluginContainerArchs);
CFIndex pluginArchCount = ::CFArrayGetCount(pluginContainerArchs);
for (CFIndex i = 0; i < pluginArchCount; i++) {
CFNumberRef currentArch = static_cast<CFNumberRef>(::CFArrayGetValueAtIndex(pluginContainerArchs, i));
int currentArchInt = 0;
if (!::CFNumberGetValue(currentArch, kCFNumberIntType, &currentArchInt)) {
continue;
}
switch (currentArchInt) {
case kCFBundleExecutableArchitectureI386:
*result |= base::PROCESS_ARCH_I386;
break;
case kCFBundleExecutableArchitectureX86_64:
*result |= base::PROCESS_ARCH_X86_64;
break;
case kCFBundleExecutableArchitecturePPC:
*result |= base::PROCESS_ARCH_PPC;
break;
default:
break;
}
}
return (*result ? NS_OK : NS_ERROR_FAILURE);
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
uint32_t GeckoChildProcessHost::GetSupportedArchitecturesForProcessType(GeckoProcessType type)
{
#ifdef MOZ_WIDGET_COCOA
if (type == GeckoProcessType_Plugin) {
// Cache this, it shouldn't ever change.
static uint32_t pluginContainerArchs = 0;
if (pluginContainerArchs == 0) {
FilePath exePath;
GetPathToBinary(exePath, type);
nsresult rv = GetArchitecturesForBinary(exePath.value().c_str(), &pluginContainerArchs);
NS_ASSERTION(NS_SUCCEEDED(rv) && pluginContainerArchs != 0, "Getting architecture of plugin container failed!");
if (NS_FAILED(rv) || pluginContainerArchs == 0) {
pluginContainerArchs = base::GetCurrentProcessArchitecture();
}
}
return pluginContainerArchs;
}
#endif
return base::GetCurrentProcessArchitecture();
}
// 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()
{
#ifdef MOZ_CRASHREPORTER
if (CrashReporter::GetEnabled()) {
CrashReporter::OOPInit();
}
#endif
#ifdef XP_WIN
if (mProcessType == GeckoProcessType_Plugin) {
InitWindowsGroupID();
}
#if defined(MOZ_CONTENT_SANDBOX)
// We need to get the pref here as the process is launched off main thread.
if (mProcessType == GeckoProcessType_Content) {
mSandboxLevel = Preferences::GetInt("security.sandbox.content.level");
mEnableSandboxLogging =
Preferences::GetBool("security.sandbox.windows.log");
}
#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_WIN_SANDBOX_LOGGING");
#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))) {
mGroupId.Append(appId);
} else {
mGroupId.Assign('-');
}
}
}
#endif
bool
GeckoChildProcessHost::SyncLaunch(std::vector<std::string> aExtraOpts, int aTimeoutMs, base::ProcessArchitecture arch)
{
PrepareLaunch();
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
NS_ASSERTION(MessageLoop::current() != ioLoop, "sync launch from the IO thread NYI");
ioLoop->PostTask(NewNonOwningRunnableMethod
<std::vector<std::string>, base::ProcessArchitecture>
(this, &GeckoChildProcessHost::RunPerformAsyncLaunch,
aExtraOpts, arch));
return WaitUntilConnected(aTimeoutMs);
}
bool
GeckoChildProcessHost::AsyncLaunch(std::vector<std::string> aExtraOpts,
base::ProcessArchitecture arch)
{
PrepareLaunch();
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
ioLoop->PostTask(NewNonOwningRunnableMethod
<std::vector<std::string>, base::ProcessArchitecture>
(this, &GeckoChildProcessHost::RunPerformAsyncLaunch,
aExtraOpts, arch));
// This may look like the sync launch wait, but we only delay as
// long as it takes to create the channel.
MonitorAutoLock lock(mMonitor);
while (mProcessState < CHANNEL_INITIALIZED) {
lock.Wait();
}
return true;
}
bool
GeckoChildProcessHost::WaitUntilConnected(int32_t aTimeoutMs)
{
PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);
// NB: this uses a different mechanism than the chromium parent
// class.
PRIntervalTime timeoutTicks = (aTimeoutMs > 0) ?
PR_MillisecondsToInterval(aTimeoutMs) : PR_INTERVAL_NO_TIMEOUT;
MonitorAutoLock lock(mMonitor);
PRIntervalTime waitStart = PR_IntervalNow();
PRIntervalTime 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;
}
lock.Wait(timeoutTicks);
if (timeoutTicks != PR_INTERVAL_NO_TIMEOUT) {
current = PR_IntervalNow();
PRIntervalTime elapsed = current - waitStart;
if (elapsed > timeoutTicks) {
break;
}
timeoutTicks = timeoutTicks - elapsed;
waitStart = current;
}
}
return mProcessState == PROCESS_CONNECTED;
}
bool
GeckoChildProcessHost::LaunchAndWaitForProcessHandle(StringVector aExtraOpts)
{
PrepareLaunch();
MessageLoop* ioLoop = XRE_GetIOMessageLoop();
ioLoop->PostTask(NewNonOwningRunnableMethod
<std::vector<std::string>, base::ProcessArchitecture>
(this, &GeckoChildProcessHost::RunPerformAsyncLaunch,
aExtraOpts, base::GetCurrentProcessArchitecture()));
MonitorAutoLock lock(mMonitor);
while (mProcessState < PROCESS_CREATED) {
lock.Wait();
}
MOZ_ASSERT(mProcessState == PROCESS_ERROR || mChildProcessHandle);
return mProcessState < PROCESS_ERROR;
}
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;
}
int32_t GeckoChildProcessHost::mChildCounter = 0;
void
GeckoChildProcessHost::SetChildLogName(const char* varName, const char* origLogName,
nsACString &buffer)
{
// We currently have no portable way to launch child with environment
// different than parent. So temporarily change NSPR_LOG_FILE so child
// inherits value we want it to have. (NSPR only looks at NSPR_LOG_FILE at
// startup, so it's 'safe' to play with the parent's environment this way.)
buffer.Assign(varName);
buffer.Append(origLogName);
// Append child-specific postfix to name
buffer.AppendLiteral(".child-");
buffer.AppendInt(mChildCounter);
// Passing temporary to PR_SetEnv is ok here if we keep the temporary
// for the time we launch the sub-process. It's copied to the new
// environment.
PR_SetEnv(buffer.BeginReading());
}
bool
GeckoChildProcessHost::PerformAsyncLaunch(std::vector<std::string> aExtraOpts, base::ProcessArchitecture arch)
{
// If NSPR log files are not requested, we're done.
const char* origNSPRLogName = PR_GetEnv("NSPR_LOG_FILE");
const char* origMozLogName = PR_GetEnv("MOZ_LOG_FILE");
if (!origNSPRLogName && !origMozLogName) {
return PerformAsyncLaunchInternal(aExtraOpts, arch);
}
// - Note: this code is not called re-entrantly, nor are restoreOrig*LogName
// or mChildCounter touched by any other thread, so this is safe.
++mChildCounter;
// Must keep these on the same stack where from we call PerformAsyncLaunchInternal
// so that PR_DuplicateEnvironment() still sees a valid memory.
nsAutoCString nsprLogName;
nsAutoCString mozLogName;
if (origNSPRLogName) {
if (mRestoreOrigNSPRLogName.IsEmpty()) {
mRestoreOrigNSPRLogName.AssignLiteral("NSPR_LOG_FILE=");
mRestoreOrigNSPRLogName.Append(origNSPRLogName);
}
SetChildLogName("NSPR_LOG_FILE=", origNSPRLogName, nsprLogName);
}
if (origMozLogName) {
if (mRestoreOrigMozLogName.IsEmpty()) {
mRestoreOrigMozLogName.AssignLiteral("MOZ_LOG_FILE=");
mRestoreOrigMozLogName.Append(origMozLogName);
}
SetChildLogName("MOZ_LOG_FILE=", origMozLogName, mozLogName);
}
bool retval = PerformAsyncLaunchInternal(aExtraOpts, arch);
// Revert to original value
if (origNSPRLogName) {
PR_SetEnv(mRestoreOrigNSPRLogName.get());
}
if (origMozLogName) {
PR_SetEnv(mRestoreOrigMozLogName.get());
}
return retval;
}
bool
GeckoChildProcessHost::RunPerformAsyncLaunch(std::vector<std::string> aExtraOpts,
base::ProcessArchitecture aArch)
{
InitializeChannel();
bool ok = PerformAsyncLaunch(aExtraOpts, aArch);
if (!ok) {
// WaitUntilConnected might be waiting for us to signal.
// If something failed let's set the error state and notify.
MonitorAutoLock lock(mMonitor);
mProcessState = PROCESS_ERROR;
lock.Notify();
CHROMIUM_LOG(ERROR) << "Failed to launch " <<
XRE_ChildProcessTypeToString(mProcessType) << " subprocess";
Telemetry::Accumulate(Telemetry::SUBPROCESS_LAUNCH_FAILURE,
nsDependentCString(XRE_ChildProcessTypeToString(mProcessType)));
}
return ok;
}
void
#if defined(XP_WIN)
AddAppDirToCommandLine(CommandLine& aCmdLine)
#else
AddAppDirToCommandLine(std::vector<std::string>& aCmdLine)
#endif
{
// Content processes need access to application resources, so pass
// the full application directory path to the child process.
if (ShouldHaveDirectoryService()) {
nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
NS_ASSERTION(directoryService, "Expected XPCOM to be available");
if (directoryService) {
nsCOMPtr<nsIFile> appDir;
// NS_XPCOM_CURRENT_PROCESS_DIR really means the app dir, not the
// current process dir.
nsresult rv = directoryService->Get(NS_XPCOM_CURRENT_PROCESS_DIR,
NS_GET_IID(nsIFile),
getter_AddRefs(appDir));
if (NS_SUCCEEDED(rv)) {
#if defined(XP_WIN)
nsString path;
MOZ_ALWAYS_SUCCEEDS(appDir->GetPath(path));
aCmdLine.AppendLooseValue(UTF8ToWide("-appdir"));
std::wstring wpath(path.get());
aCmdLine.AppendLooseValue(wpath);
#else
nsAutoCString path;
MOZ_ALWAYS_SUCCEEDS(appDir->GetNativePath(path));
aCmdLine.push_back("-appdir");
aCmdLine.push_back(path.get());
#endif
}
#if defined(XP_MACOSX) && defined(MOZ_CONTENT_SANDBOX)
// Full path to the profile dir
nsCOMPtr<nsIFile> profileDir;
rv = directoryService->Get(NS_APP_USER_PROFILE_50_DIR,
NS_GET_IID(nsIFile),
getter_AddRefs(profileDir));
if (NS_SUCCEEDED(rv)) {
nsAutoCString path;
MOZ_ALWAYS_SUCCEEDS(profileDir->GetNativePath(path));
aCmdLine.push_back("-profile");
aCmdLine.push_back(path.get());
}
#endif
}
}
}
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
static void
MaybeAddNsprLogFileAccess(std::vector<std::wstring>& aAllowedFilesReadWrite)
{
const char* nsprLogFileEnv = PR_GetEnv("NSPR_LOG_FILE");
if (!nsprLogFileEnv) {
return;
}
nsDependentCString nsprLogFilePath(nsprLogFileEnv);
nsCOMPtr<nsIFile> nsprLogFile;
nsresult rv = NS_NewNativeLocalFile(nsprLogFilePath, true,
getter_AddRefs(nsprLogFile));
if (NS_FAILED(rv)) {
// Not an absolute path, try it as a relative one.
nsresult rv = NS_GetSpecialDirectory(NS_OS_CURRENT_WORKING_DIR,
getter_AddRefs(nsprLogFile));
if (NS_FAILED(rv) || !nsprLogFile) {
NS_WARNING("Failed to get current working directory");
return;
}
rv = nsprLogFile->AppendRelativeNativePath(nsprLogFilePath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
nsAutoString resolvedFilePath;
rv = nsprLogFile->GetPath(resolvedFilePath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// Update the environment variable as well as adding the rule, because the
// Chromium sandbox can only allow access to fully qualified file paths. This
// only affects the environment for the child process we're about to create,
// because this will get reset to the original value in PerformAsyncLaunch.
aAllowedFilesReadWrite.push_back(std::wstring(resolvedFilePath.get()));
nsAutoCString resolvedEnvVar("NSPR_LOG_FILE=");
AppendUTF16toUTF8(resolvedFilePath, resolvedEnvVar);
PR_SetEnv(resolvedEnvVar.get());
}
static void
AddContentSandboxAllowedFiles(int32_t aSandboxLevel,
std::vector<std::wstring>& aAllowedFilesRead)
{
if (aSandboxLevel < 1) {
return;
}
nsCOMPtr<nsIFile> binDir;
nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(binDir));
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsAutoString binDirPath;
rv = binDir->GetPath(binDirPath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// If bin directory is on a remote drive add read access.
wchar_t volPath[MAX_PATH];
if (!::GetVolumePathNameW(binDirPath.get(), volPath, MAX_PATH)) {
return;
}
if (::GetDriveTypeW(volPath) != DRIVE_REMOTE) {
return;
}
// Convert network share path to format for sandbox policy.
if (Substring(binDirPath, 0, 2).Equals(L"\\\\")) {
binDirPath.InsertLiteral(u"??\\UNC", 1);
}
binDirPath.AppendLiteral(u"\\*");
aAllowedFilesRead.push_back(std::wstring(binDirPath.get()));
}
#endif
bool
GeckoChildProcessHost::PerformAsyncLaunchInternal(std::vector<std::string>& aExtraOpts, base::ProcessArchitecture arch)
{
// We rely on the fact that InitializeChannel() has already been processed
// on the IO thread before this point is reached.
if (!GetChannel()) {
return false;
}
base::ProcessHandle process = 0;
// send the child the PID so that it can open a ProcessHandle back to us.
// probably don't want to do this in the long run
char pidstring[32];
SprintfLiteral(pidstring,"%d", base::Process::Current().pid());
const char* const childProcessType =
XRE_ChildProcessTypeToString(mProcessType);
//--------------------------------------------------
#if defined(OS_POSIX)
// For POSIX, we have to be extremely anal about *not* using
// std::wstring in code compiled with Mozilla's -fshort-wchar
// configuration, because chromium is compiled with -fno-short-wchar
// and passing wstrings from one config to the other is unsafe. So
// we split the logic here.
#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_BSD)
base::environment_map newEnvVars;
ChildPrivileges privs = mPrivileges;
if (privs == base::PRIVILEGES_DEFAULT) {
privs = DefaultChildPrivileges();
}
#if defined(MOZ_WIDGET_GTK)
if (mProcessType == GeckoProcessType_Content) {
// disable IM module to avoid sandbox violation
newEnvVars["GTK_IM_MODULE"] = "gtk-im-context-simple";
}
#endif
// XPCOM may not be initialized in some subprocesses. We don't want
// to initialize XPCOM just for the directory service, especially
// since LD_LIBRARY_PATH is already set correctly in subprocesses
// (meaning that we don't need to set that up in the environment).
if (ShouldHaveDirectoryService()) {
MOZ_ASSERT(gGREBinPath);
nsCString path;
NS_CopyUnicodeToNative(nsDependentString(gGREBinPath), path);
# if defined(OS_LINUX) || defined(OS_BSD)
# if defined(MOZ_WIDGET_ANDROID)
path += "/lib";
# endif // MOZ_WIDGET_ANDROID
const char *ld_library_path = PR_GetEnv("LD_LIBRARY_PATH");
nsCString new_ld_lib_path(path.get());
# if (MOZ_WIDGET_GTK == 3)
if (mProcessType == GeckoProcessType_Plugin) {
new_ld_lib_path.Append("/gtk2:");
new_ld_lib_path.Append(path.get());
}
#endif
if (ld_library_path && *ld_library_path) {
new_ld_lib_path.Append(':');
new_ld_lib_path.Append(ld_library_path);
}
newEnvVars["LD_LIBRARY_PATH"] = new_ld_lib_path.get();
# elif OS_MACOSX
newEnvVars["DYLD_LIBRARY_PATH"] = path.get();
// XXX DYLD_INSERT_LIBRARIES should only be set when launching a plugin
// process, and has no effect on other subprocesses (the hooks in
// libplugin_child_interpose.dylib become noops). But currently it
// gets set when launching any kind of subprocess.
//
// Trigger "dyld interposing" for the dylib that contains
// plugin_child_interpose.mm. This allows us to hook OS calls in the
// plugin process (ones that don't work correctly in a background
// process). Don't break any other "dyld interposing" that has already
// been set up by whatever may have launched the browser.
const char* prevInterpose = PR_GetEnv("DYLD_INSERT_LIBRARIES");
nsCString interpose;
if (prevInterpose && strlen(prevInterpose) > 0) {
interpose.Assign(prevInterpose);
interpose.Append(':');
}
interpose.Append(path.get());
interpose.AppendLiteral("/libplugin_child_interpose.dylib");
newEnvVars["DYLD_INSERT_LIBRARIES"] = interpose.get();
# endif // OS_LINUX
}
#endif // OS_LINUX || OS_MACOSX
FilePath exePath;
BinaryPathType pathType = GetPathToBinary(exePath, mProcessType);
#ifdef MOZ_WIDGET_ANDROID
// The java wrapper unpacks this for us but can't make it executable
chmod(exePath.value().c_str(), 0700);
#endif // MOZ_WIDGET_ANDROID
#ifdef ANDROID
// Remap the Android property workspace to a well-known int,
// and update the environment to reflect the new value for the
// child process.
const char *apws = getenv("ANDROID_PROPERTY_WORKSPACE");
if (apws) {
int fd = atoi(apws);
mFileMap.push_back(std::pair<int, int>(fd, kMagicAndroidSystemPropFd));
char buf[32];
char *szptr = strchr(apws, ',');
snprintf(buf, sizeof(buf), "%d%s", kMagicAndroidSystemPropFd, szptr);
newEnvVars["ANDROID_PROPERTY_WORKSPACE"] = buf;
}
#endif // ANDROID
#ifdef MOZ_WIDGET_GONK
if (const char *ldPreloadPath = getenv("LD_PRELOAD")) {
newEnvVars["LD_PRELOAD"] = ldPreloadPath;
}
#endif // MOZ_WIDGET_GONK
// remap the IPC socket fd to a well-known int, as the OS does for
// STDOUT_FILENO, for example
int srcChannelFd, dstChannelFd;
channel().GetClientFileDescriptorMapping(&srcChannelFd, &dstChannelFd);
mFileMap.push_back(std::pair<int,int>(srcChannelFd, dstChannelFd));
// no need for kProcessChannelID, the child process inherits the
// other end of the socketpair() from us
std::vector<std::string> childArgv;
childArgv.push_back(exePath.value());
if (pathType == BinaryPathType::Self) {
childArgv.push_back("-contentproc");
}
childArgv.insert(childArgv.end(), aExtraOpts.begin(), aExtraOpts.end());
if (Omnijar::IsInitialized()) {
// Make sure that child processes can find the omnijar
// See XRE_InitCommandLine in nsAppRunner.cpp
nsAutoCString path;
nsCOMPtr<nsIFile> file = Omnijar::GetPath(Omnijar::GRE);
if (file && NS_SUCCEEDED(file->GetNativePath(path))) {
childArgv.push_back("-greomni");
childArgv.push_back(path.get());
}
file = Omnijar::GetPath(Omnijar::APP);
if (file && NS_SUCCEEDED(file->GetNativePath(path))) {
childArgv.push_back("-appomni");
childArgv.push_back(path.get());
}
}
// Add the application directory path (-appdir path)
AddAppDirToCommandLine(childArgv);
childArgv.push_back(pidstring);
#if defined(MOZ_CRASHREPORTER)
# if defined(OS_LINUX) || defined(OS_BSD)
int childCrashFd, childCrashRemapFd;
if (!CrashReporter::CreateNotificationPipeForChild(
&childCrashFd, &childCrashRemapFd))
return false;
if (0 <= childCrashFd) {
mFileMap.push_back(std::pair<int,int>(childCrashFd, childCrashRemapFd));
// "true" == crash reporting enabled
childArgv.push_back("true");
}
else {
// "false" == crash reporting disabled
childArgv.push_back("false");
}
# elif defined(MOZ_WIDGET_COCOA)
childArgv.push_back(CrashReporter::GetChildNotificationPipe());
# endif // OS_LINUX
#endif
#ifdef MOZ_WIDGET_COCOA
// Add a mach port to the command line so the child can communicate its
// 'task_t' back to the parent.
//
// Put a random number into the channel name, so that a compromised renderer
// can't pretend being the child that's forked off.
std::string mach_connection_name = StringPrintf("org.mozilla.machname.%d",
base::RandInt(0, std::numeric_limits<int>::max()));
childArgv.push_back(mach_connection_name.c_str());
#endif
childArgv.push_back(childProcessType);
base::LaunchApp(childArgv, mFileMap,
#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_BSD)
newEnvVars, privs,
#endif
false, &process, arch);
// We're in the parent and the child was launched. Close the child FD in the
// parent as soon as possible, which will allow the parent to detect when the
// child closes its FD (either due to normal exit or due to crash).
GetChannel()->CloseClientFileDescriptor();
#ifdef MOZ_WIDGET_COCOA
// Wait for the child process to send us its 'task_t' data.
const int kTimeoutMs = 10000;
MachReceiveMessage child_message;
ReceivePort parent_recv_port(mach_connection_name.c_str());
kern_return_t err = parent_recv_port.WaitForMessage(&child_message, kTimeoutMs);
if (err != KERN_SUCCESS) {
std::string errString = StringPrintf("0x%x %s", err, mach_error_string(err));
CHROMIUM_LOG(ERROR) << "parent WaitForMessage() failed: " << errString;
return false;
}
task_t child_task = child_message.GetTranslatedPort(0);
if (child_task == MACH_PORT_NULL) {
CHROMIUM_LOG(ERROR) << "parent GetTranslatedPort(0) failed.";
return false;
}
if (child_message.GetTranslatedPort(1) == MACH_PORT_NULL) {
CHROMIUM_LOG(ERROR) << "parent GetTranslatedPort(1) failed.";
return false;
}
MachPortSender parent_sender(child_message.GetTranslatedPort(1));
if (child_message.GetTranslatedPort(2) == MACH_PORT_NULL) {
CHROMIUM_LOG(ERROR) << "parent GetTranslatedPort(2) failed.";
}
MachPortSender* parent_recv_port_memory_ack = new MachPortSender(child_message.GetTranslatedPort(2));
if (child_message.GetTranslatedPort(3) == MACH_PORT_NULL) {
CHROMIUM_LOG(ERROR) << "parent GetTranslatedPort(3) failed.";
}
MachPortSender* parent_send_port_memory = new MachPortSender(child_message.GetTranslatedPort(3));
MachSendMessage parent_message(/* id= */0);
if (!parent_message.AddDescriptor(MachMsgPortDescriptor(bootstrap_port))) {
CHROMIUM_LOG(ERROR) << "parent AddDescriptor(" << bootstrap_port << ") failed.";
return false;
}
ReceivePort* parent_recv_port_memory = new ReceivePort();
if (!parent_message.AddDescriptor(MachMsgPortDescriptor(parent_recv_port_memory->GetPort()))) {
CHROMIUM_LOG(ERROR) << "parent AddDescriptor(" << parent_recv_port_memory->GetPort() << ") failed.";
return false;
}
ReceivePort* parent_send_port_memory_ack = new ReceivePort();
if (!parent_message.AddDescriptor(MachMsgPortDescriptor(parent_send_port_memory_ack->GetPort()))) {
CHROMIUM_LOG(ERROR) << "parent AddDescriptor(" << parent_send_port_memory_ack->GetPort() << ") failed.";
return false;
}
err = parent_sender.SendMessage(parent_message, kTimeoutMs);
if (err != KERN_SUCCESS) {
std::string errString = StringPrintf("0x%x %s", err, mach_error_string(err));
CHROMIUM_LOG(ERROR) << "parent SendMessage() failed: " << errString;
return false;
}
SharedMemoryBasic::SetupMachMemory(process, parent_recv_port_memory, parent_recv_port_memory_ack,
parent_send_port_memory, parent_send_port_memory_ack, false);
#endif
//--------------------------------------------------
#elif defined(OS_WIN)
FilePath exePath;
BinaryPathType pathType = GetPathToBinary(exePath, mProcessType);
CommandLine cmdLine(exePath.ToWStringHack());
if (pathType == BinaryPathType::Self) {
cmdLine.AppendLooseValue(UTF8ToWide("-contentproc"));
}
cmdLine.AppendSwitchWithValue(switches::kProcessChannelID, channel_id());
for (std::vector<std::string>::iterator it = aExtraOpts.begin();
it != aExtraOpts.end();
++it) {
cmdLine.AppendLooseValue(UTF8ToWide(*it));
}
if (Omnijar::IsInitialized()) {
// Make sure the child process can find the omnijar
// See XRE_InitCommandLine in nsAppRunner.cpp
nsAutoString path;
nsCOMPtr<nsIFile> file = Omnijar::GetPath(Omnijar::GRE);
if (file && NS_SUCCEEDED(file->GetPath(path))) {
cmdLine.AppendLooseValue(UTF8ToWide("-greomni"));
cmdLine.AppendLooseValue(path.get());
}
file = Omnijar::GetPath(Omnijar::APP);
if (file && NS_SUCCEEDED(file->GetPath(path))) {
cmdLine.AppendLooseValue(UTF8ToWide("-appomni"));
cmdLine.AppendLooseValue(path.get());
}
}
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
bool shouldSandboxCurrentProcess = false;
// XXX: Bug 1124167: We should get rid of the process specific logic for
// sandboxing in this class at some point. Unfortunately it will take a bit
// of reorganizing so I don't think this patch is the right time.
switch (mProcessType) {
case GeckoProcessType_Content:
#if defined(MOZ_CONTENT_SANDBOX)
if (mSandboxLevel > 0 &&
!PR_GetEnv("MOZ_DISABLE_CONTENT_SANDBOX")) {
// For now we treat every failure as fatal in SetSecurityLevelForContentProcess
// and just crash there right away. Should this change in the future then we
// should also handle the error here.
mSandboxBroker.SetSecurityLevelForContentProcess(mSandboxLevel);
shouldSandboxCurrentProcess = true;
AddContentSandboxAllowedFiles(mSandboxLevel, mAllowedFilesRead);
}
#endif // MOZ_CONTENT_SANDBOX
break;
case GeckoProcessType_Plugin:
if (mSandboxLevel > 0 &&
!PR_GetEnv("MOZ_DISABLE_NPAPI_SANDBOX")) {
bool ok = mSandboxBroker.SetSecurityLevelForPluginProcess(mSandboxLevel);
if (!ok) {
return false;
}
shouldSandboxCurrentProcess = true;
}
break;
case GeckoProcessType_IPDLUnitTest:
// XXX: We don't sandbox this process type yet
break;
case GeckoProcessType_GMPlugin:
if (!PR_GetEnv("MOZ_DISABLE_GMP_SANDBOX")) {
// The Widevine CDM on Windows can only load at USER_RESTRICTED,
// not at USER_LOCKDOWN. So look in the command line arguments
// to see if we're loading the path to the Widevine CDM, and if
// so use sandbox level USER_RESTRICTED instead of USER_LOCKDOWN.
bool isWidevine = std::any_of(aExtraOpts.begin(), aExtraOpts.end(),
[](const std::string arg) { return arg.find("gmp-widevinecdm") != std::string::npos; });
auto level = isWidevine ? SandboxBroker::Restricted : SandboxBroker::LockDown;
bool ok = mSandboxBroker.SetSecurityLevelForGMPlugin(level);
if (!ok) {
return false;
}
shouldSandboxCurrentProcess = true;
}
break;
case GeckoProcessType_GPU:
break;
case GeckoProcessType_Default:
default:
MOZ_CRASH("Bad process type in GeckoChildProcessHost");
break;
};
if (shouldSandboxCurrentProcess) {
MaybeAddNsprLogFileAccess(mAllowedFilesReadWrite);
for (auto it = mAllowedFilesRead.begin();
it != mAllowedFilesRead.end();
++it) {
mSandboxBroker.AllowReadFile(it->c_str());
}
for (auto it = mAllowedFilesReadWrite.begin();
it != mAllowedFilesReadWrite.end();
++it) {
mSandboxBroker.AllowReadWriteFile(it->c_str());
}
for (auto it = mAllowedDirectories.begin();
it != mAllowedDirectories.end();
++it) {
mSandboxBroker.AllowDirectory(it->c_str());
}
}
#endif // XP_WIN && MOZ_SANDBOX
// Add the application directory path (-appdir path)
AddAppDirToCommandLine(cmdLine);
// XXX Command line params past this point are expected to be at
// the end of the command line string, and in a specific order.
// See XRE_InitChildProcess in nsEmbedFunction.
// Win app model id
cmdLine.AppendLooseValue(mGroupId.get());
// Process id
cmdLine.AppendLooseValue(UTF8ToWide(pidstring));
#if defined(MOZ_CRASHREPORTER)
cmdLine.AppendLooseValue(
UTF8ToWide(CrashReporter::GetChildNotificationPipe()));
#endif
// Process type
cmdLine.AppendLooseValue(UTF8ToWide(childProcessType));
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
if (shouldSandboxCurrentProcess) {
if (mSandboxBroker.LaunchApp(cmdLine.program().c_str(),
cmdLine.command_line_string().c_str(),
mEnableSandboxLogging,
&process)) {
EnvironmentLog("MOZ_PROCESS_LOG").print(
"==> process %d launched child process %d (%S)\n",
base::GetCurrentProcId(), base::GetProcId(process),
cmdLine.command_line_string().c_str());
}
} else
#endif
{
base::LaunchApp(cmdLine, false, false, &process);
#ifdef MOZ_SANDBOX
// We need to be able to duplicate handles to some types of non-sandboxed
// child processes.
if (mProcessType == GeckoProcessType_Content ||
mProcessType == GeckoProcessType_GPU ||
mProcessType == GeckoProcessType_GMPlugin) {
if (!mSandboxBroker.AddTargetPeer(process)) {
NS_WARNING("Failed to add content process as target peer.");
}
}
#endif
}
#else
# error Sorry
#endif
if (!process) {
return false;
}
// NB: on OS X, we block much longer than we need to in order to
// reach this call, waiting for the child process's task_t. The
// best way to fix that is to refactor this file, hard.
#if defined(MOZ_WIDGET_COCOA)
mChildTask = child_task;
#endif
if (!OpenPrivilegedHandle(base::GetProcId(process))
#ifdef XP_WIN
// If we failed in opening the process handle, try harder by duplicating
// one.
&& !::DuplicateHandle(::GetCurrentProcess(), process,
::GetCurrentProcess(), &mChildProcessHandle,
PROCESS_DUP_HANDLE | PROCESS_TERMINATE |
PROCESS_QUERY_INFORMATION | PROCESS_VM_READ |
SYNCHRONIZE,
FALSE, 0)
#endif
) {
NS_RUNTIMEABORT("cannot open handle to child process");
}
MonitorAutoLock lock(mMonitor);
mProcessState = PROCESS_CREATED;
lock.Notify();
return true;
}
bool
GeckoChildProcessHost::OpenPrivilegedHandle(base::ProcessId aPid)
{
if (mChildProcessHandle) {
MOZ_ASSERT(aPid == base::GetProcId(mChildProcessHandle));
return true;
}
return base::OpenPrivilegedProcessHandle(aPid, &mChildProcessHandle);
}
void
GeckoChildProcessHost::OnChannelConnected(int32_t peer_pid)
{
if (!OpenPrivilegedHandle(peer_pid)) {
NS_RUNTIMEABORT("can't open handle to child process");
}
MonitorAutoLock lock(mMonitor);
mProcessState = PROCESS_CONNECTED;
lock.Notify();
}
void
GeckoChildProcessHost::OnMessageReceived(IPC::Message&& aMsg)
{
// We never process messages ourself, just save them up for the next
// listener.
mQueue.push(Move(aMsg));
}
void
GeckoChildProcessHost::OnChannelError()
{
// Update the process state to an error state if we have a channel
// error before we're connected. This fixes certain failures,
// but does not address the full range of possible issues described
// in the FIXME comment below.
MonitorAutoLock lock(mMonitor);
if (mProcessState < PROCESS_CONNECTED) {
mProcessState = PROCESS_ERROR;
lock.Notify();
}
// FIXME/bug 773925: save up this error for the next listener.
}
void
GeckoChildProcessHost::GetQueuedMessages(std::queue<IPC::Message>& queue)
{
// If this is called off the IO thread, bad things will happen.
DCHECK(MessageLoopForIO::current());
swap(queue, mQueue);
// We expect the next listener to take over processing of our queue.
}
bool GeckoChildProcessHost::sRunSelfAsContentProc(false);
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