ipc/glue/UtilityProcessImpl.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #include "UtilityProcessImpl.h"
   7
   8 #include "mozilla/ipc/IOThreadChild.h"
   9 #include "mozilla/GeckoArgs.h"
  10
  11 #if defined(OS_WIN) && defined(MOZ_SANDBOX)
  12 #  include "mozilla/sandboxTarget.h"
  13 #  include "WMF.h"
  14 #  include "WMFDecoderModule.h"
  15 #endif
  16
  17 #if defined(XP_OPENBSD) && defined(MOZ_SANDBOX)
  18 #  include "mozilla/SandboxSettings.h"
  19 #endif
  20
  21 namespace mozilla::ipc {
  22
  23 UtilityProcessImpl::~UtilityProcessImpl() = default;
  24
  25 #if defined(XP_WIN)
  26 /* static */
  27 void UtilityProcessImpl::LoadLibraryOrCrash(LPCWSTR aLib) {
  28   HMODULE module = ::LoadLibraryW(aLib);
  29   if (!module) {
  30     MOZ_CRASH("Unable to preload module");
  31   }
  32 }
  33 #endif  // defined(XP_WIN)
  34
  35 bool UtilityProcessImpl::Init(int aArgc, char* aArgv[]) {
  36   Maybe<uint64_t> sandboxingKind = geckoargs::sSandboxingKind.Get(aArgc, aArgv);
  37   if (sandboxingKind.isNothing()) {
  38     return false;
  39   }
  40
  41   if (*sandboxingKind >= SandboxingKind::COUNT) {
  42     return false;
  43   }
  44
  45 #if defined(MOZ_SANDBOX) && defined(OS_WIN)
  46   // We delay load winmm.dll so that its dependencies don't interfere with COM
  47   // initialization when win32k is locked down. We need to load it before we
  48   // lower the sandbox in processes where the policy will prevent loading.
  49   ::LoadLibraryW(L"winmm.dll");
  50
  51   if (*sandboxingKind == SandboxingKind::GENERIC_UTILITY) {
  52     // Preload audio generic libraries required for ffmpeg only
  53     UtilityAudioDecoderParent::GenericPreloadForSandbox();
  54   }
  55
  56   if (*sandboxingKind == SandboxingKind::UTILITY_AUDIO_DECODING_WMF
  57 #  ifdef MOZ_WMF_MEDIA_ENGINE
  58       || *sandboxingKind == SandboxingKind::MF_MEDIA_ENGINE_CDM
  59 #  endif
  60   ) {
  61     UtilityAudioDecoderParent::WMFPreloadForSandbox();
  62   }
  63
  64   // Go for it
  65   mozilla::SandboxTarget::Instance()->StartSandbox();
  66 #elif defined(__OpenBSD__) && defined(MOZ_SANDBOX)
  67   StartOpenBSDSandbox(GeckoProcessType_Utility,
  68                       (SandboxingKind)*sandboxingKind);
  69 #endif
  70
  71   Maybe<const char*> parentBuildID =
  72       geckoargs::sParentBuildID.Get(aArgc, aArgv);
  73   if (parentBuildID.isNothing()) {
  74     return false;
  75   }
  76
  77   if (!ProcessChild::InitPrefs(aArgc, aArgv)) {
  78     return false;
  79   }
  80
  81   return mUtility->Init(TakeInitialEndpoint(), nsCString(*parentBuildID),
  82                         *sandboxingKind);
  83 }
  84
  85 void UtilityProcessImpl::CleanUp() { NS_ShutdownXPCOM(nullptr); }
  86
  87 }  // namespace mozilla::ipc