toolkit/xre/WinDllServices.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 https://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/WinDllServices.h"
   8
   9 #include <windows.h>
  10 #include <psapi.h>
  11
  12 #include "mozilla/ClearOnShutdown.h"
  13 #include "mozilla/SchedulerGroup.h"
  14 #include "mozilla/Services.h"
  15 #include "mozilla/StaticLocalPtr.h"
  16 #include "mozilla/UntrustedModulesProcessor.h"
  17 #include "nsCOMPtr.h"
  18 #include "nsIObserverService.h"
  19 #include "nsString.h"
  20 #include "nsXULAppAPI.h"
  21
  22 namespace mozilla {
  23
  24 const char* DllServices::kTopicDllLoadedMainThread = "dll-loaded-main-thread";
  25 const char* DllServices::kTopicDllLoadedNonMainThread =
  26     "dll-loaded-non-main-thread";
  27
  28 /* static */
  29 DllServices* DllServices::Get() {
  30   static StaticLocalRefPtr<DllServices> sInstance(
  31       []() -> already_AddRefed<DllServices> {
  32         RefPtr<DllServices> dllSvc(new DllServices());
  33         // Full DLL services require XPCOM, which GMP doesn't have
  34         if (XRE_IsGMPluginProcess()) {
  35           dllSvc->EnableBasic();
  36         } else {
  37           dllSvc->EnableFull();
  38         }
  39
  40         auto setClearOnShutdown = [ptr = &sInstance]() -> void {
  41           ClearOnShutdown(ptr);
  42         };
  43
  44         if (NS_IsMainThread()) {
  45           setClearOnShutdown();
  46           return dllSvc.forget();
  47         }
  48
  49         SchedulerGroup::Dispatch(
  50             TaskCategory::Other,
  51             NS_NewRunnableFunction("mozilla::DllServices::Get",
  52                                    std::move(setClearOnShutdown)));
  53
  54         return dllSvc.forget();
  55       }());
  56
  57   return sInstance;
  58 }
  59
  60 DllServices::~DllServices() { DisableFull(); }
  61
  62 void DllServices::StartUntrustedModulesProcessor() {
  63   MOZ_ASSERT(NS_IsMainThread());
  64   MOZ_ASSERT(!mUntrustedModulesProcessor);
  65   mUntrustedModulesProcessor = UntrustedModulesProcessor::Create();
  66 }
  67
  68 RefPtr<UntrustedModulesPromise> DllServices::GetUntrustedModulesData() {
  69   if (!mUntrustedModulesProcessor) {
  70     return UntrustedModulesPromise::CreateAndReject(NS_ERROR_NOT_IMPLEMENTED,
  71                                                     __func__);
  72   }
  73
  74   return mUntrustedModulesProcessor->GetProcessedData();
  75 }
  76
  77 void DllServices::DisableFull() {
  78   if (XRE_IsGMPluginProcess()) {
  79     return;
  80   }
  81
  82   if (mUntrustedModulesProcessor) {
  83     mUntrustedModulesProcessor->Disable();
  84   }
  85
  86   glue::DllServices::DisableFull();
  87 }
  88
  89 RefPtr<ModulesTrustPromise> DllServices::GetModulesTrust(
  90     ModulePaths&& aModPaths, bool aRunAtNormalPriority) {
  91   if (!mUntrustedModulesProcessor) {
  92     return ModulesTrustPromise::CreateAndReject(NS_ERROR_NOT_IMPLEMENTED,
  93                                                 __func__);
  94   }
  95
  96   return mUntrustedModulesProcessor->GetModulesTrust(std::move(aModPaths),
  97                                                      aRunAtNormalPriority);
  98 }
  99
 100 void DllServices::NotifyDllLoad(glue::EnhancedModuleLoadInfo&& aModLoadInfo) {
 101   MOZ_ASSERT(NS_IsMainThread());
 102
 103   const char* topic;
 104
 105   if (aModLoadInfo.mNtLoadInfo.mThreadId == ::GetCurrentThreadId()) {
 106     topic = kTopicDllLoadedMainThread;
 107   } else {
 108     topic = kTopicDllLoadedNonMainThread;
 109   }
 110
 111   // We save the path to a nsAutoString because once we have submitted
 112   // aModLoadInfo for processing there is no guarantee that the original
 113   // buffer will continue to be valid.
 114   nsAutoString dllFilePath(aModLoadInfo.GetSectionName());
 115
 116   if (mUntrustedModulesProcessor) {
 117     mUntrustedModulesProcessor->Enqueue(std::move(aModLoadInfo));
 118   }
 119
 120   nsCOMPtr<nsIObserverService> obsServ(mozilla::services::GetObserverService());
 121   if (!obsServ) {
 122     return;
 123   }
 124
 125   obsServ->NotifyObservers(nullptr, topic, dllFilePath.get());
 126 }
 127
 128 void DllServices::NotifyModuleLoadBacklog(ModuleLoadInfoVec&& aEvents) {
 129   MOZ_ASSERT(NS_IsMainThread());
 130   if (!mUntrustedModulesProcessor) {
 131     return;
 132   }
 133
 134   mUntrustedModulesProcessor->Enqueue(std::move(aEvents));
 135 }
 136
 137 }  // namespace mozilla