Bug 1901197: do synchronous Content Analysis for clipboard operations on a background thread r=dlp-reviewers,ipc-reviewers,handyman

Differential Revision: https://phabricator.services.mozilla.com/D215457

build/clang-plugin/ThreadAllows.txt

@@ -20,6 +20,9 @@
 # Used by `nsUpdateProcessor` to check for updates. May also be used for polling
 # the update process.
 UpdateProcessor
+# Used by `BackgroundClipboardContentAnalysisParent` to handle clipboard requests
+# from content processes.
+BkgrndClipboard
 
 ######
 # Thunderbird-only thread names

dom/ipc/ContentChild.cpp

@@ -24,6 +24,7 @@
 #include "imgLoader.h"
 #include "ScrollingMetrics.h"
 #include "mozilla/BasePrincipal.h"
+#include "mozilla/ClipboardContentAnalysisChild.h"
 #include "mozilla/ClipboardReadRequestChild.h"
 #include "mozilla/Components.h"
 #include "mozilla/HangDetails.h"
@@ -1544,6 +1545,14 @@ mozilla::ipc::IPCResult ContentChild::RecvInitGMPService(
   return IPC_OK();
 }
 
+mozilla::ipc::IPCResult ContentChild::RecvInitClipboardContentAnalysis(
+    Endpoint<PClipboardContentAnalysisChild>&& aEndpoint) {
+  if (!ClipboardContentAnalysisChild::Create(std::move(aEndpoint))) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+  return IPC_OK();
+}
+
 mozilla::ipc::IPCResult ContentChild::RecvInitProfiler(
     Endpoint<PProfilerChild>&& aEndpoint) {
   mProfilerController = ChildProfilerController::Create(std::move(aEndpoint));

dom/ipc/ContentChild.h

@@ -160,6 +160,9 @@ class ContentChild final : public PContentChild,
   mozilla::ipc::IPCResult RecvInitProfiler(
       Endpoint<PProfilerChild>&& aEndpoint);
 
+  mozilla::ipc::IPCResult RecvInitClipboardContentAnalysis(
+      Endpoint<PClipboardContentAnalysisChild>&& aEndpoint);
+
   mozilla::ipc::IPCResult RecvGMPsChanged(
       nsTArray<GMPCapabilityData>&& capabilities);
 

dom/ipc/ContentParent.cpp

@@ -47,6 +47,7 @@
 #include "mozilla/AntiTrackingUtils.h"
 #include "mozilla/AppShutdown.h"
 #include "mozilla/AutoRestore.h"
+#include "mozilla/ClipboardContentAnalysisParent.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/BenchmarkStorageParent.h"
 #include "mozilla/Casting.h"
@@ -1114,6 +1115,65 @@ static nsIDocShell* GetOpenerDocShellHelper(Element* aFrameElement) {
   return docShell;
 }
 
+mozilla::ipc::IPCResult ContentParent::RecvCreateClipboardContentAnalysis() {
+  Endpoint<PClipboardContentAnalysisParent> parentEndpoint;
+  Endpoint<PClipboardContentAnalysisChild> childEndpoint;
+
+  if (mClipboardContentAnalysisCreated) {
+    return IPC_FAIL(this, "ClipboardContentAnalysisParent already created");
+  }
+
+  nsresult rv;
+  rv = PClipboardContentAnalysis::CreateEndpoints(
+      base::GetCurrentProcId(), OtherPid(), &parentEndpoint, &childEndpoint);
+  if (NS_FAILED(rv)) {
+    return IPC_FAIL(this, "CreateEndpoints failed");
+  }
+
+  if (!mClipboardContentAnalysisThread) {
+    rv = NS_NewNamedThread("BkgrndClipboard",
+                           getter_AddRefs(mClipboardContentAnalysisThread));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return IPC_FAIL(this, "NS_NewNamedThread failed");
+    }
+  }
+
+  RefPtr<ContentParent> contentParent = this;
+  // Bind the new endpoint to the backgroundClipboardContentAnalysis thread,
+  // then send them from the main thread.
+  rv = NS_DispatchToThreadQueue(
+      NS_NewRunnableFunction(
+          "Create ClipboardContentAnalysisParent",
+          [contentParent = std::move(contentParent),
+           parentEndpoint = std::move(parentEndpoint),
+           childEndpoint = std::move(childEndpoint)]() mutable {
+            RefPtr<ClipboardContentAnalysisParent> parentActor =
+                new ClipboardContentAnalysisParent();
+            parentEndpoint.Bind(parentActor, nullptr);
+            DebugOnly<nsresult> rv = NS_DispatchToMainThread(
+                NS_NewRunnableFunction(
+                    "SendInitClipboardContentAnalysis",
+                    [contentParent = std::move(contentParent),
+                     childEndpoint = std::move(childEndpoint)]() mutable {
+                      DebugOnly<bool> success =
+                          contentParent->SendInitClipboardContentAnalysis(
+                              std::move(childEndpoint));
+                      MOZ_ASSERT(success,
+                                 "SendInitClipboardContentAnalysis failed");
+                    }),
+                0);
+            MOZ_ASSERT(NS_SUCCEEDED(rv),
+                       "Failed to dispatch "
+                       "SendInitClipboardContentAnalysis");
+          }),
+      mClipboardContentAnalysisThread, EventQueuePriority::Normal);
+  if (NS_FAILED(rv)) {
+    return IPC_FAIL(this, "NS_DispatchToThreadQueue failed");
+  }
+  mClipboardContentAnalysisCreated = true;
+  return IPC_OK();
+}
+
 mozilla::ipc::IPCResult ContentParent::RecvCreateGMPService() {
   Endpoint<PGMPServiceParent> parent;
   Endpoint<PGMPServiceChild> child;
@@ -2531,6 +2591,7 @@ ContentParent::ContentParent(const nsACString& aRemoteType)
       mIsInputPriorityEventEnabled(false),
       mIsInPool(false),
       mGMPCreated(false),
+      mClipboardContentAnalysisCreated(false),
 #ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
       mBlockShutdownCalled(false),
 #endif
@@ -3115,10 +3176,8 @@ mozilla::ipc::IPCResult ContentParent::RecvSetClipboard(
   return IPC_OK();
 }
 
-namespace {
-
-static Result<nsCOMPtr<nsITransferable>, nsresult> CreateTransferable(
-    const nsTArray<nsCString>& aTypes) {
+/* static */ Result<nsCOMPtr<nsITransferable>, nsresult>
+ContentParent::CreateClipboardTransferable(const nsTArray<nsCString>& aTypes) {
   nsresult rv;
   nsCOMPtr<nsITransferable> trans =
       do_CreateInstance("@mozilla.org/widget/transferable;1", &rv);
@@ -3141,8 +3200,6 @@ static Result<nsCOMPtr<nsITransferable>, nsresult> CreateTransferable(
   return std::move(trans);
 }
 
-}  // anonymous namespace
-
 mozilla::ipc::IPCResult ContentParent::RecvGetClipboard(
     nsTArray<nsCString>&& aTypes, const int32_t& aWhichClipboard,
     const MaybeDiscarded<WindowContext>& aRequestingWindowContext,
@@ -3171,7 +3228,7 @@ mozilla::ipc::IPCResult ContentParent::RecvGetClipboard(
   }
 
   // Create transferable
-  auto result = CreateTransferable(aTypes);
+  auto result = CreateClipboardTransferable(aTypes);
   if (result.isErr()) {
     *aTransferableDataOrError = result.unwrapErr();
     return IPC_OK();

dom/ipc/ContentParent.h

@@ -30,6 +30,7 @@
 #include "mozilla/MemoryReportingProcess.h"
 #include "mozilla/MozPromise.h"
 #include "mozilla/RecursiveMutex.h"
+#include "mozilla/Result.h"
 #include "mozilla/StaticPtr.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/UniquePtr.h"
@@ -44,6 +45,7 @@
 #include "nsIInterfaceRequestor.h"
 #include "nsIObserver.h"
 #include "nsIRemoteTab.h"
+#include "nsITransferable.h"
 #include "nsIDOMGeoPositionCallback.h"
 #include "nsIDOMGeoPositionErrorCallback.h"
 #include "nsRefPtrHashtable.h"
@@ -228,6 +230,12 @@ class ContentParent final : public PContentParent,
           hal::ProcessPriority::PROCESS_PRIORITY_FOREGROUND,
       bool aPreferUsed = false, uint64_t aBrowserId = 0);
 
+  /**
+   * Create an nsITransferable with the specified data flavor types.
+   */
+  static mozilla::Result<nsCOMPtr<nsITransferable>, nsresult>
+  CreateClipboardTransferable(const nsTArray<nsCString>& aTypes);
+
   /**
    * Asynchronously wait for this content process to finish launching, such that
    * the ContentParent actor is ready for IPC.
@@ -343,6 +351,7 @@ class ContentParent final : public PContentParent,
   // been updated and so full reflows are in order.
   static void NotifyUpdatedFonts(bool aFullRebuild);
 
+  mozilla::ipc::IPCResult RecvCreateClipboardContentAnalysis();
   mozilla::ipc::IPCResult RecvCreateGMPService();
 
   NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(ContentParent, nsIObserver)
@@ -1510,6 +1519,9 @@ class ContentParent final : public PContentParent,
 
   // True if we already created a GMP service.
   uint8_t mGMPCreated : 1;
+  // True if we already created the
+  // ClipboardContentAnalysis actor
+  uint8_t mClipboardContentAnalysisCreated : 1;
 
 #ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
   bool mBlockShutdownCalled;
@@ -1590,6 +1602,8 @@ class ContentParent final : public PContentParent,
 
   bool mIsSignaledImpendingShutdown = false;
   bool mIsNotifiedShutdownSuccess = false;
+
+  nsCOMPtr<nsIThread> mClipboardContentAnalysisThread;
 };
 
 NS_DEFINE_STATIC_IID_ACCESSOR(ContentParent, NS_CONTENTPARENT_IID)

dom/ipc/PContent.ipdl

@@ -6,6 +6,7 @@
 
 include protocol PBackgroundStarter;
 include protocol PBrowser;
+include protocol PClipboardContentAnalysis;
 include protocol PClipboardReadRequest;
 include protocol PClipboardWriteRequest;
 include protocol PCompositorManager;
@@ -578,6 +579,7 @@ child:
     async InitGMPService(Endpoint<PGMPServiceChild> service);
     async InitProcessHangMonitor(Endpoint<PProcessHangMonitorChild> hangMonitor);
     async InitProfiler(Endpoint<PProfilerChild> aEndpoint);
+    async InitClipboardContentAnalysis(Endpoint<PClipboardContentAnalysisChild> aEndpoint);
 
     // Give the content process its endpoints to the compositor.
     async InitRendering(
@@ -1088,6 +1090,8 @@ parent:
 
     async CreateGMPService();
 
+    async CreateClipboardContentAnalysis();
+
     async InitStreamFilter(uint64_t channelId, nsString addonId)
         returns (Endpoint<PStreamFilterChild> aEndpoint);
 

ipc/ipdl/sync-messages.ini

@@ -96,6 +96,8 @@ description = Only used by gtests
 description = Only used by gtests
 
 # Clipboard
+[PClipboardContentAnalysis::GetClipboard]
+description = Legacy synchronous clipboard API
 [PContent::GetClipboard]
 description = Legacy synchronous clipboard API
 [PContent::ClipboardHasType]

widget/ClipboardContentAnalysisChild.cpp

@@ -0,0 +1,14 @@
+/* -*- 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 "ClipboardContentAnalysisChild.h"
+
+namespace mozilla {
+
+StaticRefPtr<ClipboardContentAnalysisChild>
+    ClipboardContentAnalysisChild::sSingleton;
+
+}  // namespace mozilla

widget/ClipboardContentAnalysisChild.h

@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISCHILD_H_
+#define MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISCHILD_H_
+
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/PClipboardContentAnalysisChild.h"
+
+namespace mozilla {
+class ClipboardContentAnalysisChild final
+    : public PClipboardContentAnalysisChild {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ClipboardContentAnalysisChild, override)
+
+  static bool Create(Endpoint<PClipboardContentAnalysisChild>&& aEndpoint) {
+    MOZ_ASSERT(!sSingleton);
+    sSingleton = new ClipboardContentAnalysisChild();
+    DebugOnly<bool> success = aEndpoint.Bind(sSingleton);
+    MOZ_ASSERT(success);
+    return true;
+  }
+  static ClipboardContentAnalysisChild* GetSingleton() { return sSingleton; }
+  void ActorDestroy(ActorDestroyReason aReason) override final {
+    // There's only one singleton, so remove our reference to it.
+    sSingleton = nullptr;
+  }
+
+ private:
+  friend PClipboardContentAnalysisChild;
+  ClipboardContentAnalysisChild() { MOZ_ASSERT(XRE_IsContentProcess()); }
+  ~ClipboardContentAnalysisChild() = default;
+  static StaticRefPtr<ClipboardContentAnalysisChild> sSingleton;
+};
+}  // namespace mozilla
+
+#endif  // MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISCHILD_H_

widget/ClipboardContentAnalysisParent.cpp

@@ -0,0 +1,165 @@
+/* -*- 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 "ContentAnalysis.h"
+#include "mozilla/ClipboardContentAnalysisParent.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/WindowGlobalParent.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Variant.h"
+#include "mozilla/SpinEventLoopUntil.h"
+#include "nsBaseClipboard.h"
+#include "nsIClipboard.h"
+#include "nsID.h"
+#include "nsITransferable.h"
+#include "nsWidgetsCID.h"
+
+namespace mozilla {
+static NS_DEFINE_CID(kCClipboardCID, NS_CLIPBOARD_CID);
+
+ipc::IPCResult ClipboardContentAnalysisParent::RecvGetClipboard(
+    nsTArray<nsCString>&& aTypes, const int32_t& aWhichClipboard,
+    const uint64_t& aRequestingWindowContextId,
+    IPCTransferableDataOrError* aTransferableDataOrError) {
+  // The whole point of having this actor is that it runs on a background thread
+  // and so waiting for the content analysis result won't cause the main thread
+  // to use SpinEventLoopUntil() which can cause a shutdownhang per bug 1901197.
+  MOZ_ASSERT(!NS_IsMainThread());
+  RefPtr<nsIThread> actorThread = NS_GetCurrentThread();
+  NS_ASSERTION(actorThread, "NS_GetCurrentThread() should not fail");
+  // Ideally this would be a Maybe<Result>, but Result<> doesn't have a way to
+  // get a reference to the IPCTransferableData inside it which makes it awkward
+  // to use in this case.
+  mozilla::Maybe<mozilla::Variant<IPCTransferableData, nsresult>>
+      maybeTransferableResult;
+  std::atomic<bool> transferableResultSet = false;
+
+  NS_DispatchToMainThread(NS_NewRunnableFunction(
+      __func__, [actorThread, aTypes = std::move(aTypes), aWhichClipboard,
+                 aRequestingWindowContextId, &maybeTransferableResult,
+                 &transferableResultSet]() {
+        nsresult rv = NS_OK;
+        // Make sure we reply to the actor thread on error.
+        auto sendRv = MakeScopeExit([&]() {
+          maybeTransferableResult = Some(AsVariant(rv));
+          transferableResultSet = true;
+          // Wake up the actor thread so SpinEventLoopUntil() can check its
+          // condition again.
+          NS_DispatchToThreadQueue(NS_NewRunnableFunction(__func__, []() {}),
+                                   actorThread, EventQueuePriority::Normal);
+        });
+        nsCOMPtr<nsIClipboard> clipboard;
+        RefPtr<dom::WindowGlobalParent> window =
+            dom::WindowGlobalParent::GetByInnerWindowId(
+                aRequestingWindowContextId);
+        // We expect content processes to always pass a non-null window so
+        // Content Analysis can analyze it. (if Content Analysis is
+        // active) There may be some cases when a window is closing, etc.,
+        // in which case returning no clipboard content should not be a
+        // problem.
+        if (!window) {
+          rv = NS_ERROR_FAILURE;
+          return;
+        }
+
+        if (window->IsDiscarded()) {
+          NS_WARNING(
+              "discarded window passed to RecvGetClipboard(); returning "
+              "no clipboard "
+              "content");
+          rv = NS_ERROR_FAILURE;
+          return;
+        }
+
+        // Retrieve clipboard
+        clipboard = do_GetService(kCClipboardCID, &rv);
+        NS_ENSURE_SUCCESS_VOID(rv);
+
+        auto transferableToCheck =
+            dom::ContentParent::CreateClipboardTransferable(aTypes);
+        if (transferableToCheck.isErr()) {
+          rv = transferableToCheck.unwrapErr();
+          return;
+        }
+
+        // Pass nullptr for the window here because we will be doing
+        // content analysis ourselves asynchronously (so it doesn't block
+        // main thread we're running on now)
+        nsCOMPtr transferable = transferableToCheck.unwrap();
+        rv = clipboard->GetData(transferable, aWhichClipboard, nullptr);
+        NS_ENSURE_SUCCESS_VOID(rv);
+
+        auto contentAnalysisCallback =
+            mozilla::MakeRefPtr<mozilla::contentanalysis::ContentAnalysis::
+                                    SafeContentAnalysisResultCallback>(
+                [actorThread, transferable, aRequestingWindowContextId,
+                 &maybeTransferableResult, &transferableResultSet](
+                    RefPtr<nsIContentAnalysisResult>&& aResult) {
+                  bool shouldAllow = aResult->GetShouldAllowContent();
+                  if (!shouldAllow) {
+                    maybeTransferableResult =
+                        Some(AsVariant(NS_ERROR_CONTENT_BLOCKED));
+                  } else {
+                    IPCTransferableData transferableData;
+                    RefPtr<dom::WindowGlobalParent> window =
+                        dom::WindowGlobalParent::GetByInnerWindowId(
+                            aRequestingWindowContextId);
+                    if (!window && window->IsDiscarded()) {
+                      maybeTransferableResult =
+                          Some(AsVariant(NS_ERROR_UNEXPECTED));
+                    } else {
+                      maybeTransferableResult =
+                          Some(AsVariant(IPCTransferableData()));
+                      nsContentUtils::TransferableToIPCTransferableData(
+                          transferable,
+                          &(maybeTransferableResult.ref()
+                                .as<IPCTransferableData>()),
+                          true /* aInSyncMessage */,
+                          window->BrowsingContext()->GetContentParent());
+                    }
+                  }
+                  transferableResultSet = true;
+
+                  // Setting maybeTransferableResult is done on the main thread
+                  // instead of inside the runnable function here because some
+                  // of the objects that can be inside a maybeTransferableResult
+                  // are not thread-safe.
+                  // Wake up the actor thread so SpinEventLoopUntil() can check
+                  // its condition again.
+                  NS_DispatchToThreadQueue(
+                      NS_NewRunnableFunction(__func__, []() {}), actorThread,
+                      EventQueuePriority::Normal);
+                });
+
+        contentanalysis::ContentAnalysis::CheckClipboardContentAnalysis(
+            static_cast<nsBaseClipboard*>(clipboard.get()), window,
+            transferable, aWhichClipboard, contentAnalysisCallback);
+
+        sendRv.release();
+      }));
+
+  mozilla::SpinEventLoopUntil(
+      "Waiting for clipboard and content analysis"_ns,
+      [&transferableResultSet] { return transferableResultSet.load(); });
+
+  NS_ASSERTION(maybeTransferableResult.isSome(),
+               "maybeTransferableResult should be set when "
+               "transferableResultSet is true!");
+  auto& transferableResult = *maybeTransferableResult;
+  if (transferableResult.is<nsresult>()) {
+    *aTransferableDataOrError = transferableResult.as<nsresult>();
+    NS_WARNING(
+        nsPrintfCString("ClipboardContentAnalysisParent::"
+                        "RecvGetClipboard got error %x",
+                        static_cast<int>(transferableResult.as<nsresult>()))
+            .get());
+  } else {
+    *aTransferableDataOrError =
+        std::move(transferableResult.as<IPCTransferableData>());
+  }
+
+  return IPC_OK();
+}
+}  // namespace mozilla

widget/ClipboardContentAnalysisParent.h

@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISPARENT_H_
+#define MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISPARENT_H_
+
+#include "mozilla/PClipboardContentAnalysisParent.h"
+
+namespace mozilla {
+
+class ClipboardContentAnalysisParent final
+    : public PClipboardContentAnalysisParent {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(ClipboardContentAnalysisParent, override)
+
+ private:
+  ~ClipboardContentAnalysisParent() = default;
+
+ public:
+  ipc::IPCResult RecvGetClipboard(
+      nsTArray<nsCString>&& aTypes, const int32_t& aWhichClipboard,
+      const uint64_t& aRequestingWindowContextId,
+      IPCTransferableDataOrError* aTransferableDataOrError);
+};
+}  // namespace mozilla
+
+#endif  // MOZILLA_WIDGET_CLIPBOARDCONTENTANALYSISPARENT_H_

widget/PClipboardContentAnalysis.ipdl

@@ -0,0 +1,24 @@
+/* -*- tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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 IPCTransferable;
+
+namespace mozilla {
+
+[ChildProc=Content]
+sync protocol PClipboardContentAnalysis
+{
+parent:
+    // Given a list of supported types, returns the clipboard data for the
+    // first type that matches.
+    // aRequestingWindowContext is the window that is requesting the clipboard,
+    // which is used for content analysis.
+    sync GetClipboard(nsCString[] aTypes, int32_t aWhichClipboard,
+                      uint64_t aRequestingWindowContextId)
+        returns (IPCTransferableDataOrError transferableDataOrError);
+};
+
+}

widget/moz.build

@@ -166,6 +166,8 @@ EXPORTS += [
 
 EXPORTS.mozilla += [
     "BasicEvents.h",
+    "ClipboardContentAnalysisChild.h",
+    "ClipboardContentAnalysisParent.h",
     "ClipboardReadRequestChild.h",
     "ClipboardReadRequestParent.h",
     "ClipboardWriteRequestChild.h",
@@ -217,6 +219,8 @@ EXPORTS.mozilla.widget += [
 ]
 
 UNIFIED_SOURCES += [
+    "ClipboardContentAnalysisChild.cpp",
+    "ClipboardContentAnalysisParent.cpp",
     "ClipboardReadRequestParent.cpp",
     "ClipboardWriteRequestChild.cpp",
     "ClipboardWriteRequestParent.cpp",
@@ -377,6 +381,7 @@ else:
 
 IPDL_SOURCES += [
     "LookAndFeelTypes.ipdlh",
+    "PClipboardContentAnalysis.ipdl",
     "PClipboardReadRequest.ipdl",
     "PClipboardWriteRequest.ipdl",
 ]

widget/nsClipboardProxy.cpp

@@ -7,15 +7,19 @@
 #if defined(ACCESSIBILITY) && defined(XP_WIN)
 #  include "mozilla/a11y/Compatibility.h"
 #endif
+#include "mozilla/ClipboardContentAnalysisChild.h"
 #include "mozilla/ClipboardReadRequestChild.h"
 #include "mozilla/ClipboardWriteRequestChild.h"
+#include "mozilla/Components.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/net/CookieJarSettings.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/dom/WindowGlobalChild.h"
 #include "mozilla/Unused.h"
+#include "mozilla/SpinEventLoopUntil.h"
 #include "nsArrayUtils.h"
 #include "nsBaseClipboard.h"
+#include "nsIContentAnalysis.h"
 #include "nsISupportsPrimitives.h"
 #include "nsCOMPtr.h"
 #include "nsComponentManagerUtils.h"
@@ -73,8 +77,29 @@ nsClipboardProxy::GetData(nsITransferable* aTransferable,
   aTransferable->FlavorsTransferableCanImport(types);
 
   IPCTransferableDataOrError transferableOrError;
-  ContentChild::GetSingleton()->SendGetClipboard(
-      types, aWhichClipboard, aWindowContext, &transferableOrError);
+  nsCOMPtr<nsIContentAnalysis> contentAnalysis =
+      mozilla::components::nsIContentAnalysis::Service();
+  Unused << NS_WARN_IF(!contentAnalysis);
+  bool contentAnalysisMightBeActive = false;
+  if (contentAnalysis) {
+    contentAnalysis->GetMightBeActive(&contentAnalysisMightBeActive);
+  }
+  if (MOZ_UNLIKELY(contentAnalysisMightBeActive)) {
+    if (!ClipboardContentAnalysisChild::GetSingleton()) {
+      if (!ContentChild::GetSingleton()->SendCreateClipboardContentAnalysis()) {
+        return NS_ERROR_FAILURE;
+      }
+      mozilla::SpinEventLoopUntil(
+          "Wait for ClipboardContentAnalysisChild creation"_ns,
+          [] { return ClipboardContentAnalysisChild::GetSingleton(); });
+    }
+    ClipboardContentAnalysisChild::GetSingleton()->SendGetClipboard(
+        types, aWhichClipboard, aWindowContext->InnerWindowId(),
+        &transferableOrError);
+  } else {
+    ContentChild::GetSingleton()->SendGetClipboard(
+        types, aWhichClipboard, aWindowContext, &transferableOrError);
+  }
 
   if (transferableOrError.type() == IPCTransferableDataOrError::Tnsresult) {
     MOZ_ASSERT(NS_FAILED(transferableOrError.get_nsresult()));