gecko-dev/dom/ipc/ContentProcess.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 "mozilla/ipc/IOThreadChild.h"
#include "ContentProcess.h"
#include "base/shared_memory.h"
#include "mozilla/Preferences.h"
#include "mozilla/Scheduler.h"
#include "mozilla/recordreplay/ParentIPC.h"
#if defined(XP_MACOSX) && defined(MOZ_CONTENT_SANDBOX)
#include <stdlib.h>
#endif
#if (defined(XP_WIN) || defined(XP_MACOSX)) && defined(MOZ_CONTENT_SANDBOX)
#include "mozilla/SandboxSettings.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsDirectoryService.h"
#include "nsDirectoryServiceDefs.h"
#endif
using mozilla::ipc::IOThreadChild;
namespace mozilla {
namespace dom {
#if defined(XP_WIN) && defined(MOZ_CONTENT_SANDBOX)
static void
SetTmpEnvironmentVariable(nsIFile* aValue)
{
// Save the TMP environment variable so that is is picked up by GetTempPath().
// Note that we specifically write to the TMP variable, as that is the first
// variable that is checked by GetTempPath() to determine its output.
nsAutoString fullTmpPath;
nsresult rv = aValue->GetPath(fullTmpPath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TMP", fullTmpPath.get()));
// We also set TEMP in case there is naughty third-party code that is
// referencing the environment variable directly.
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TEMP", fullTmpPath.get()));
}
#endif
#if defined(XP_WIN) && defined(MOZ_CONTENT_SANDBOX)
static void
SetUpSandboxEnvironment()
{
MOZ_ASSERT(nsDirectoryService::gService,
"SetUpSandboxEnvironment relies on nsDirectoryService being initialized");
// On Windows, a sandbox-writable temp directory is used whenever the sandbox
// is enabled.
if (!IsContentSandboxEnabled()) {
return;
}
nsCOMPtr<nsIFile> sandboxedContentTemp;
nsresult rv =
nsDirectoryService::gService->Get(NS_APP_CONTENT_PROCESS_TEMP_DIR,
NS_GET_IID(nsIFile),
getter_AddRefs(sandboxedContentTemp));
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// Change the gecko defined temp directory to our sandbox-writable one.
// Undefine returns a failure if the property is not already set.
Unused << nsDirectoryService::gService->Undefine(NS_OS_TEMP_DIR);
rv = nsDirectoryService::gService->Set(NS_OS_TEMP_DIR, sandboxedContentTemp);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
SetTmpEnvironmentVariable(sandboxedContentTemp);
}
#endif
#ifdef ANDROID
static int gPrefsFd = -1;
static int gPrefMapFd = -1;
void
SetPrefsFd(int aFd)
{
gPrefsFd = aFd;
}
void
SetPrefMapFd(int aFd)
{
gPrefMapFd = aFd;
}
#endif
bool
ContentProcess::Init(int aArgc, char* aArgv[])
{
Maybe<uint64_t> childID;
Maybe<bool> isForBrowser;
Maybe<base::SharedMemoryHandle> prefsHandle;
Maybe<FileDescriptor> prefMapHandle;
Maybe<size_t> prefsLen;
Maybe<size_t> prefMapSize;
Maybe<const char*> schedulerPrefs;
Maybe<const char*> parentBuildID;
#if defined(XP_MACOSX) && defined(MOZ_CONTENT_SANDBOX)
nsCOMPtr<nsIFile> profileDir;
#endif
// Parses an arg containing a pointer-sized-integer.
auto parseUIntPtrArg = [] (char*& aArg) {
// ContentParent uses %zu to print a word-sized unsigned integer. So
// even though strtoull() returns a long long int, it will fit in a
// uintptr_t.
return uintptr_t(strtoull(aArg, &aArg, 10));
};
#ifdef XP_WIN
auto parseHandleArg = [&] (char*& aArg) {
return HANDLE(parseUIntPtrArg(aArg));
};
#endif
for (int i = 1; i < aArgc; i++) {
if (!aArgv[i]) {
continue;
}
if (strcmp(aArgv[i], "-appdir") == 0) {
if (++i == aArgc) {
return false;
}
nsDependentCString appDir(aArgv[i]);
mXREEmbed.SetAppDir(appDir);
} else if (strcmp(aArgv[i], "-childID") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
childID = Some(strtoull(str, &str, 10));
if (str[0] != '\0') {
return false;
}
} else if (strcmp(aArgv[i], "-isForBrowser") == 0) {
isForBrowser = Some(true);
} else if (strcmp(aArgv[i], "-notForBrowser") == 0) {
isForBrowser = Some(false);
#ifdef XP_WIN
} else if (strcmp(aArgv[i], "-prefsHandle") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
prefsHandle = Some(parseHandleArg(str));
if (str[0] != '\0') {
return false;
}
} else if (strcmp(aArgv[i], "-prefMapHandle") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
// The FileDescriptor constructor will clone this handle when constructed,
// so store it in a UniquePlatformHandle to make sure the original gets
// closed.
FileDescriptor::UniquePlatformHandle handle(parseHandleArg(str));
prefMapHandle.emplace(handle.get());
if (str[0] != '\0') {
return false;
}
#endif
} else if (strcmp(aArgv[i], "-prefsLen") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
prefsLen = Some(parseUIntPtrArg(str));
if (str[0] != '\0') {
return false;
}
} else if (strcmp(aArgv[i], "-prefMapSize") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
prefMapSize = Some(parseUIntPtrArg(str));
if (str[0] != '\0') {
return false;
}
} else if (strcmp(aArgv[i], "-schedulerPrefs") == 0) {
if (++i == aArgc) {
return false;
}
schedulerPrefs = Some(aArgv[i]);
} else if (strcmp(aArgv[i], "-safeMode") == 0) {
gSafeMode = true;
} else if (strcmp(aArgv[i], "-parentBuildID") == 0) {
if (++i == aArgc) {
return false;
}
parentBuildID = Some(aArgv[i]);
#if defined(XP_MACOSX) && defined(MOZ_CONTENT_SANDBOX)
} else if (strcmp(aArgv[i], "-profile") == 0) {
if (++i == aArgc) {
return false;
}
bool flag;
nsresult rv = XRE_GetFileFromPath(aArgv[i], getter_AddRefs(profileDir));
if (NS_FAILED(rv) || NS_FAILED(profileDir->Exists(&flag)) || !flag) {
NS_WARNING("Invalid profile directory passed to content process.");
profileDir = nullptr;
}
#endif /* XP_MACOSX && MOZ_CONTENT_SANDBOX */
}
}
#ifdef ANDROID
// Android is different; get the FD via gPrefsFd instead of a fixed fd.
MOZ_RELEASE_ASSERT(gPrefsFd != -1);
prefsHandle = Some(base::FileDescriptor(gPrefsFd, /* auto_close */ true));
FileDescriptor::UniquePlatformHandle handle(gPrefMapFd);
prefMapHandle.emplace(handle.get());
#elif XP_UNIX
prefsHandle = Some(base::FileDescriptor(kPrefsFileDescriptor,
/* auto_close */ true));
// The FileDescriptor constructor will clone this handle when constructed,
// so store it in a UniquePlatformHandle to make sure the original gets
// closed.
FileDescriptor::UniquePlatformHandle handle(kPrefMapFileDescriptor);
prefMapHandle.emplace(handle.get());
#endif
// Did we find all the mandatory flags?
if (childID.isNothing() ||
isForBrowser.isNothing() ||
prefsHandle.isNothing() ||
prefsLen.isNothing() ||
prefMapHandle.isNothing() ||
prefMapSize.isNothing() ||
schedulerPrefs.isNothing() ||
parentBuildID.isNothing()) {
return false;
}
// Init the shared-memory base preference mapping first, so that only changed
// preferences wind up in heap memory.
Preferences::InitSnapshot(prefMapHandle.ref(), *prefMapSize);
// Set up early prefs from the shared memory.
base::SharedMemory shm;
if (!shm.SetHandle(*prefsHandle, /* read_only */ true)) {
NS_ERROR("failed to open shared memory in the child");
return false;
}
if (!shm.Map(*prefsLen)) {
NS_ERROR("failed to map shared memory in the child");
return false;
}
Preferences::DeserializePreferences(static_cast<char*>(shm.memory()),
*prefsLen);
Scheduler::SetPrefs(*schedulerPrefs);
if (recordreplay::IsMiddleman()) {
recordreplay::parent::InitializeMiddleman(aArgc, aArgv, ParentPid(),
*prefsHandle, *prefMapHandle);
}
mContent.Init(IOThreadChild::message_loop(),
ParentPid(),
*parentBuildID,
IOThreadChild::channel(),
*childID,
*isForBrowser);
mXREEmbed.Start();
#if (defined(XP_MACOSX)) && defined(MOZ_CONTENT_SANDBOX)
mContent.SetProfileDir(profileDir);
#endif
#if defined(XP_WIN) && defined(MOZ_CONTENT_SANDBOX)
SetUpSandboxEnvironment();
#endif
return true;
}
// Note: CleanUp() never gets called in non-debug builds because we exit early
// in ContentChild::ActorDestroy().
void
ContentProcess::CleanUp()
{
mXREEmbed.Stop();
}
} // namespace dom
} // namespace mozilla