The Tor Browser: ipc/glue/GeckoChildProcessHost.cpp@7e26c7da4463 (annotated)

ipc/glue/GeckoChildProcessHost.cpp@7e26c7da4463 (annotated)

ipc/glue/GeckoChildProcessHost.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  */
 /* 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"
 #if defined(XP_WIN) && defined(MOZ_CONTENT_SANDBOX)
 #include "sandboxBroker.h"
 #endif
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/string_util.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"
 #endif
 #include "MainThreadUtils.h"
 #include "prprf.h"
 #include "prenv.h"
 #include "nsExceptionHandler.h"
 #include "nsDirectoryServiceDefs.h"
 #include "nsIFile.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/ipc/BrowserProcessSubThread.h"
 #include "mozilla/Omnijar.h"
 #include <sys/stat.h>
 #ifdef XP_WIN
 #include "nsIWinTaskbar.h"
 #define NS_TASKBAR_CONTRACTID "@mozilla.org/windows-taskbar;1"
 #endif
 #include "nsTArray.h"
 #include "nsClassHashtable.h"
 #include "nsHashKeys.h"
 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
 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
   ;
 mozilla::StaticRefPtr<nsIFile> GeckoChildProcessHost::sGreDir;
 mozilla::DebugOnly<bool> GeckoChildProcessHost::sGreDirCached;
 static bool
 ShouldHaveDirectoryService()
 {
   return GeckoProcessType_Default == XRE_GetProcessType();
 }
 template<>
 struct RunnableMethodTraits<GeckoChildProcessHost>
 {
     static void RetainCallee(GeckoChildProcessHost* obj) { }
     static void ReleaseCallee(GeckoChildProcessHost* obj) { }
 };
 /*static*/
 base::ChildPrivileges
 GeckoChildProcessHost::DefaultChildPrivileges()
 {
   return (kLowRightsSubprocesses ?
           base::PRIVILEGES_UNPRIVILEGED : base::PRIVILEGES_INHERIT);
 }
 GeckoChildProcessHost::GeckoChildProcessHost(GeckoProcessType aProcessType,
                                              ChildPrivileges aPrivileges)
   : ChildProcessHost(RENDER_PROCESS), // FIXME/cjones: we should own this enum
     mProcessType(aProcessType),
     mSandboxEnabled(true),
     mPrivileges(aPrivileges),
     mMonitor("mozilla.ipc.GeckChildProcessHost.mMonitor"),
     mProcessState(CREATING_CHANNEL),
     mDelegate(nullptr),
     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)
     ProcessWatcher::EnsureProcessTerminated(mChildProcessHandle
 #if defined(NS_BUILD_REFCNT_LOGGING)
                                             , false // don't "force"
 #endif
     );
 #if defined(MOZ_WIDGET_COCOA)
   if (mChildTask != MACH_PORT_NULL)
     mach_port_deallocate(mach_task_self(), mChildTask);
 #endif
 }
 //static
 void
 GeckoChildProcessHost::GetPathToBinary(FilePath& exePath)
 {
   if (ShouldHaveDirectoryService()) {
     MOZ_ASSERT(sGreDirCached);
     if (sGreDir) {
 #ifdef OS_WIN
       nsString path;
       MOZ_ALWAYS_TRUE(NS_SUCCEEDED(sGreDir->GetPath(path)));
 #else
       nsCString path;
       MOZ_ALWAYS_TRUE(NS_SUCCEEDED(sGreDir->GetNativePath(path)));
 #endif
       exePath = FilePath(path.get());
 #ifdef MOZ_WIDGET_COCOA
       // We need to use an App Bundle on OS X so that we can hide
       // the dock icon. See Bug 557225.
       exePath = exePath.AppendASCII(MOZ_CHILD_PROCESS_BUNDLE);
 #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);
 }
 #ifdef MOZ_WIDGET_COCOA
 class AutoCFTypeObject {
 public:
   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) {
       CacheGreDir();
       FilePath exePath;
       GetPathToBinary(exePath);
       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();
 }
 void
 GeckoChildProcessHost::PrepareLaunch()
 {
 #ifdef MOZ_CRASHREPORTER
   if (CrashReporter::GetEnabled()) {
     CrashReporter::OOPInit();
   }
 #endif
 #ifdef XP_WIN
   InitWindowsGroupID();
 #endif
   CacheGreDir();
 }
 //static
 void
 GeckoChildProcessHost::CacheGreDir()
 {
   // PerformAysncLaunchInternal/GetPathToBinary may be called on the IO thread,
   // and they want to use the directory service, which needs to happen on the
   // main thread (in the event that its implemented in JS). So we grab
   // NS_GRE_DIR here and stash it.
 #ifdef MOZ_WIDGET_GONK
   // Apparently, this ASSERT should be present on all platforms. Currently,
   // this assert causes mochitest failures on the Mac platform if its left in.
   // B2G overrides the directory service in JS, so this needs to be called
   // on the main thread.
   MOZ_ASSERT(NS_IsMainThread());
 #endif
   if (ShouldHaveDirectoryService()) {
     nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
     MOZ_ASSERT(directoryService, "Expected XPCOM to be available");
     if (directoryService) {
       // getter_AddRefs doesn't work with StaticRefPtr, so we need to store the
       // result in an nsCOMPtr and copy it over.
       nsCOMPtr<nsIFile> greDir;
       nsresult rv = directoryService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile), getter_AddRefs(greDir));
       if (NS_SUCCEEDED(rv)) {
         sGreDir = greDir;
         mozilla::ClearOnShutdown(&sGreDir);
       }
     }
   }
   sGreDirCached = true;
 }
 #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.AssignLiteral("-");
     }
   }
 }
 #endif
 bool
 GeckoChildProcessHost::SyncLaunch(std::vector<std::string> aExtraOpts, int aTimeoutMs, base::ProcessArchitecture arch)
 {
   PrepareLaunch();
   PRIntervalTime timeoutTicks = (aTimeoutMs > 0) ?
     PR_MillisecondsToInterval(aTimeoutMs) : PR_INTERVAL_NO_TIMEOUT;
   MessageLoop* ioLoop = XRE_GetIOMessageLoop();
   NS_ASSERTION(MessageLoop::current() != ioLoop, "sync launch from the IO thread NYI");
   ioLoop->PostTask(FROM_HERE,
                    NewRunnableMethod(this,
                                      &GeckoChildProcessHost::RunPerformAsyncLaunch,
                                      aExtraOpts, arch));
   // NB: this uses a different mechanism than the chromium parent
   // class.
   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::AsyncLaunch(std::vector<std::string> aExtraOpts)
 {
   PrepareLaunch();
   MessageLoop* ioLoop = XRE_GetIOMessageLoop();
   ioLoop->PostTask(FROM_HERE,
                    NewRunnableMethod(this,
                                      &GeckoChildProcessHost::RunPerformAsyncLaunch,
                                      aExtraOpts, base::GetCurrentProcessArchitecture()));
   // 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::LaunchAndWaitForProcessHandle(StringVector aExtraOpts)
 {
   PrepareLaunch();
   MessageLoop* ioLoop = XRE_GetIOMessageLoop();
   ioLoop->PostTask(FROM_HERE,
                    NewRunnableMethod(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()
 {
   mChildProcessHandle = 0;
 }
 int32_t GeckoChildProcessHost::mChildCounter = 0;
 //
 // Wrapper function for handling GECKO_SEPARATE_NSPR_LOGS
 //
 bool
 GeckoChildProcessHost::PerformAsyncLaunch(std::vector<std::string> aExtraOpts, base::ProcessArchitecture arch)
 {
   // If NSPR log files are not requested, we're done.
   const char* origLogName = PR_GetEnv("NSPR_LOG_FILE");
   if (!origLogName) {
     return PerformAsyncLaunchInternal(aExtraOpts, arch);
   }
   // 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.)
   nsAutoCString setChildLogName("NSPR_LOG_FILE=");
   setChildLogName.Append(origLogName);
   // remember original value so we can restore it.
   // - buffer needs to be permanently allocated for PR_SetEnv()
   // - Note: this code is not called re-entrantly, nor are restoreOrigLogName
   //   or mChildCounter touched by any other thread, so this is safe.
   static char* restoreOrigLogName = 0;
   if (!restoreOrigLogName)
     restoreOrigLogName = strdup(setChildLogName.get());
   // Append child-specific postfix to name
   setChildLogName.AppendLiteral(".child-");
   setChildLogName.AppendInt(++mChildCounter);
   // Passing temporary to PR_SetEnv is ok here because env gets copied
   // by exec, etc., to permanent storage in child when process launched.
   PR_SetEnv(setChildLogName.get());
   bool retval = PerformAsyncLaunchInternal(aExtraOpts, arch);
   // Revert to original value
   PR_SetEnv(restoreOrigLogName);
   return retval;
 }
 bool
 GeckoChildProcessHost::RunPerformAsyncLaunch(std::vector<std::string> aExtraOpts,
                                              base::ProcessArchitecture aArch)
 {
   InitializeChannel();
   return PerformAsyncLaunch(aExtraOpts, aArch);
 }
 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)) {
         nsAutoCString path;
         MOZ_ALWAYS_TRUE(NS_SUCCEEDED(appDir->GetNativePath(path)));
 #if defined(XP_WIN)
         aCmdLine.AppendLooseValue(UTF8ToWide("-appdir"));
         aCmdLine.AppendLooseValue(UTF8ToWide(path.get()));
 #else
         aCmdLine.push_back("-appdir");
         aCmdLine.push_back(path.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];
   PR_snprintf(pidstring, sizeof(pidstring) - 1,
 	      "%ld", 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();
   }
   // 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(sGreDirCached);
     if (sGreDir) {
       nsCString path;
       MOZ_ALWAYS_TRUE(NS_SUCCEEDED(sGreDir->GetNativePath(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;
       if (ld_library_path && *ld_library_path) {
           new_ld_lib_path.Assign(path.get());
           new_ld_lib_path.AppendLiteral(":");
           new_ld_lib_path.Append(ld_library_path);
           newEnvVars["LD_LIBRARY_PATH"] = new_ld_lib_path.get();
       } else {
           newEnvVars["LD_LIBRARY_PATH"] = 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) {
         interpose.Assign(prevInterpose);
         interpose.AppendLiteral(":");
       }
       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;
   GetPathToBinary(exePath);
 #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());
   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));
   MachSendMessage parent_message(/* id= */0);
   if (!parent_message.AddDescriptor(bootstrap_port)) {
     CHROMIUM_LOG(ERROR) << "parent AddDescriptor(" << bootstrap_port << ") 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;
   }
 #endif
 //--------------------------------------------------
 #elif defined(OS_WIN)
   FilePath exePath;
   GetPathToBinary(exePath);
   CommandLine cmdLine(exePath.ToWStringHack());
   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_CONTENT_SANDBOX)
   if (mSandboxEnabled) {
     // Tell the process that it should lower its rights after initialization.
     cmdLine.AppendLooseValue(UTF8ToWide("-sandbox"));
   }
 #endif
   // 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_CONTENT_SANDBOX)
   if (mSandboxEnabled) {
     mozilla::SandboxBroker sandboxBroker;
     sandboxBroker.LaunchApp(cmdLine.program().c_str(),
                             cmdLine.command_line_string().c_str(),
                             &process);
   } else
 #endif
   {
     base::LaunchApp(cmdLine, false, false, &process);
   }
 #else
 #  error Sorry
 #endif
   if (!process) {
     MonitorAutoLock lock(mMonitor);
     mProcessState = PROCESS_ERROR;
     lock.Notify();
     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.
   SetHandle(process);
 #if defined(MOZ_WIDGET_COCOA)
   mChildTask = child_task;
 #endif
   OpenPrivilegedHandle(base::GetProcId(process));
   {
     MonitorAutoLock lock(mMonitor);
     mProcessState = PROCESS_CREATED;
     lock.Notify();
   }
   return true;
 }
 void
 GeckoChildProcessHost::OpenPrivilegedHandle(base::ProcessId aPid)
 {
   if (mChildProcessHandle) {
     MOZ_ASSERT(aPid == base::GetProcId(mChildProcessHandle));
     return;
   }
   if (!base::OpenPrivilegedProcessHandle(aPid, &mChildProcessHandle)) {
     NS_RUNTIMEABORT("can't open handle to child process");
   }
 }
 void
 GeckoChildProcessHost::OnChannelConnected(int32_t peer_pid)
 {
   OpenPrivilegedHandle(peer_pid);
   {
     MonitorAutoLock lock(mMonitor);
     mProcessState = PROCESS_CONNECTED;
     lock.Notify();
   }
 }
 void
 GeckoChildProcessHost::OnMessageReceived(const IPC::Message& aMsg)
 {
   // We never process messages ourself, just save them up for the next
   // listener.
   mQueue.push(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.
 }
 void
 GeckoChildProcessHost::OnWaitableEventSignaled(base::WaitableEvent *event)
 {
   if (mDelegate) {
     mDelegate->OnWaitableEventSignaled(event);
   }
   ChildProcessHost::OnWaitableEventSignaled(event);
 }
 #ifdef MOZ_NUWA_PROCESS
 using mozilla::ipc::GeckoExistingProcessHost;
 using mozilla::ipc::FileDescriptor;
 GeckoExistingProcessHost::
 GeckoExistingProcessHost(GeckoProcessType aProcessType,
                          base::ProcessHandle aProcess,
                          const FileDescriptor& aFileDescriptor,
                          ChildPrivileges aPrivileges)
   : GeckoChildProcessHost(aProcessType, aPrivileges)
   , mExistingProcessHandle(aProcess)
   , mExistingFileDescriptor(aFileDescriptor)
 {
   NS_ASSERTION(aFileDescriptor.IsValid(),
                "Expected file descriptor to be valid");
 }
 GeckoExistingProcessHost::~GeckoExistingProcessHost()
 {
   // Bug 943174: If we don't do this, ~GeckoChildProcessHost will try
   // to wait on a process that isn't a direct child, and bad things
   // will happen.
   SetAlreadyDead();
 }
 bool
 GeckoExistingProcessHost::PerformAsyncLaunch(StringVector aExtraOpts,
                                              base::ProcessArchitecture aArch)
 {
   SetHandle(mExistingProcessHandle);
   OpenPrivilegedHandle(base::GetProcId(mExistingProcessHandle));
   MonitorAutoLock lock(mMonitor);
   mProcessState = PROCESS_CREATED;
   lock.Notify();
   return true;
 }
 void
 GeckoExistingProcessHost::InitializeChannel()
 {
   CreateChannel(mExistingFileDescriptor);
   MonitorAutoLock lock(mMonitor);
   mProcessState = CHANNEL_INITIALIZED;
   lock.Notify();
 }
 #endif /* MOZ_NUWA_PROCESS */

The Tor Browser / annotate

ipc/glue/GeckoChildProcessHost.cpp@7e26c7da4463 (annotated)

ipc/glue/GeckoChildProcessHost.cpp