diff --git a/Source/WebKit/Platform/SharedMemory.cpp b/Source/WebKit/Platform/SharedMemory.cpp
index 6430273dfb90..e92aa8a91a2f 100644
--- a/Source/WebKit/Platform/SharedMemory.cpp
+++ b/Source/WebKit/Platform/SharedMemory.cpp
@@ -33,6 +33,17 @@ namespace WebKit {
 
 using namespace WebCore;
 
+SharedMemoryHandle::SharedMemoryHandle(SharedMemoryHandle::Type&& handle, size_t size)
+    : m_handle(WTFMove(handle))
+    , m_size(size)
+{
+}
+
+bool SharedMemoryHandle::isNull() const
+{
+    return !m_handle;
+}
+
 RefPtr<SharedMemory> SharedMemory::copyBuffer(const FragmentedSharedBuffer& buffer)
 {
     if (buffer.isEmpty())
diff --git a/Source/WebKit/Platform/SharedMemory.h b/Source/WebKit/Platform/SharedMemory.h
index 05af7aa2fb82..9e71fee9a31e 100644
--- a/Source/WebKit/Platform/SharedMemory.h
+++ b/Source/WebKit/Platform/SharedMemory.h
@@ -60,6 +60,7 @@ namespace WebKit {
 enum class MemoryLedger { None, Default, Network, Media, Graphics, Neural };
 
 class SharedMemoryHandle {
+    WTF_MAKE_NONCOPYABLE(SharedMemoryHandle);
 public:
     using Type =
 #if USE(UNIX_DOMAIN_SOCKETS)
@@ -70,6 +71,12 @@ class SharedMemoryHandle {
         Win32Handle;
 #endif
 
+    SharedMemoryHandle() = default;
+    SharedMemoryHandle(SharedMemoryHandle&&) = default;
+    SharedMemoryHandle(SharedMemoryHandle::Type&&, size_t);
+
+    SharedMemoryHandle& operator=(SharedMemoryHandle&&) = default;
+
     bool isNull() const;
 
     size_t size() const { return m_size; }
diff --git a/Source/WebKit/Platform/cocoa/SharedMemoryCocoa.cpp b/Source/WebKit/Platform/cocoa/SharedMemoryCocoa.cpp
index ac5119b694c7..9eb2d75d4ff5 100644
--- a/Source/WebKit/Platform/cocoa/SharedMemoryCocoa.cpp
+++ b/Source/WebKit/Platform/cocoa/SharedMemoryCocoa.cpp
@@ -91,11 +91,6 @@ void SharedMemoryHandle::setOwnershipOfMemory(const WebCore::ProcessIdentity& pr
 #endif
 }
 
-bool SharedMemoryHandle::isNull() const
-{
-    return !m_handle;
-}
-
 static inline void* toPointer(mach_vm_address_t address)
 {
     return reinterpret_cast<void*>(static_cast<uintptr_t>(address));
diff --git a/Source/WebKit/Platform/unix/SharedMemoryUnix.cpp b/Source/WebKit/Platform/unix/SharedMemoryUnix.cpp
index d798fb06a40b..45aeb5ca49ef 100644
--- a/Source/WebKit/Platform/unix/SharedMemoryUnix.cpp
+++ b/Source/WebKit/Platform/unix/SharedMemoryUnix.cpp
@@ -52,11 +52,6 @@
 
 namespace WebKit {
 
-bool SharedMemoryHandle::isNull() const
-{
-    return !m_handle;
-}
-
 UnixFileDescriptor SharedMemoryHandle::releaseHandle()
 {
     return WTFMove(m_handle);
diff --git a/Source/WebKit/Platform/win/SharedMemoryWin.cpp b/Source/WebKit/Platform/win/SharedMemoryWin.cpp
index 215e29cebbd2..9e9b1b9d7cd7 100644
--- a/Source/WebKit/Platform/win/SharedMemoryWin.cpp
+++ b/Source/WebKit/Platform/win/SharedMemoryWin.cpp
@@ -31,11 +31,6 @@
 
 namespace WebKit {
 
-bool SharedMemoryHandle::isNull() const
-{
-    return !m_handle;
-}
-
 RefPtr<SharedMemory> SharedMemory::allocate(size_t size)
 {
     Win32Handle handle { ::CreateFileMappingW(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, size, 0) };
diff --git a/Source/WebKit/Shared/IPCStreamTester.cpp b/Source/WebKit/Shared/IPCStreamTester.cpp
index 6e1826e5e98f..d57eb16fc474 100644
--- a/Source/WebKit/Shared/IPCStreamTester.cpp
+++ b/Source/WebKit/Shared/IPCStreamTester.cpp
@@ -26,15 +26,15 @@
 #include "config.h"
 #include "IPCStreamTester.h"
 
-#include <wtf/WTFProcess.h>
-
 #if ENABLE(IPC_TESTING_API)
+
 #include "Decoder.h"
 #include "IPCStreamTesterMessages.h"
 #include "IPCStreamTesterProxyMessages.h"
 #include "IPCUtilities.h"
 #include "StreamConnectionWorkQueue.h"
 #include "StreamServerConnection.h"
+#include <wtf/WTFProcess.h>
 
 #if USE(FOUNDATION)
 #include <CoreFoundation/CoreFoundation.h>
@@ -86,7 +86,7 @@ void IPCStreamTester::syncMessageReturningSharedMemory1(uint32_t byteCount, Comp
         uint8_t* data = static_cast<uint8_t*>(sharedMemory->data());
         for (size_t i = 0; i < sharedMemory->size(); ++i)
             data[i] = i;
-        return *handle;
+        return WTFMove(*handle);
     }();
     completionHandler(WTFMove(result));
 }
diff --git a/Source/WebKit/WebProcess/WebPage/IPCTestingAPI.cpp b/Source/WebKit/WebProcess/WebPage/IPCTestingAPI.cpp
index 29b40ae0a730..f15f0c30546f 100644
--- a/Source/WebKit/WebProcess/WebPage/IPCTestingAPI.cpp
+++ b/Source/WebKit/WebProcess/WebPage/IPCTestingAPI.cpp
@@ -1342,7 +1342,7 @@ JSValueRef JSIPCSemaphore::waitFor(JSContextRef context, JSObjectRef, JSObjectRe
 SharedMemory::Handle JSSharedMemory::createHandle(SharedMemory::Protection protection)
 {
     if (auto handle = m_sharedMemory->createHandle(protection))
-        return *handle;
+        return WTFMove(*handle);
     return { };
 }