--- /dev/null
+++ xnu/xnu-12377.1.9/iokit/Kernel/IOProviderPropertyMerger.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2024 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#include <IOKit/IOProviderPropertyMerger.h>
+#include <IOKit/IOService.h>
+
+#define super IOService
+OSDefineMetaClassAndStructors(IOProviderPropertyMerger, IOService);
+
+bool
+IOProviderPropertyMerger::init(OSDictionary * dictionary)
+{
+	OSDictionary *mergeProperties = OSDynamicCast(OSDictionary, dictionary->getObject(kIOProviderMergePropertiesKey));
+	OSDictionary *parentMergeProperties = OSDynamicCast(OSDictionary, dictionary->getObject(kIOProviderParentMergePropertiesKey));
+
+	// remove security-sensitive properties from the dictionary used to merge properties to provider
+	if (mergeProperties) {
+		mergeProperties->removeObject(gIOServiceDEXTEntitlementsKey);
+	}
+	if (parentMergeProperties) {
+		parentMergeProperties->removeObject(gIOServiceDEXTEntitlementsKey);
+	}
+
+	return super::init(dictionary);
+}
+
+bool
+IOProviderPropertyMerger::setProperty(const OSSymbol * aKey, OSObject * anObject)
+{
+	// Disallow modifying security-sensitive properties
+	if (aKey->isEqualTo(kIOProviderMergePropertiesKey) || aKey->isEqualTo(kIOProviderParentMergePropertiesKey)) {
+		return false;
+	}
+	return super::setProperty(aKey, anObject);
+}
+
+void
+IOProviderPropertyMerger::setPropertyTable(OSDictionary * dict __unused)
+{
+	// Disallow changing the entire property table since that can change security-sensitive properties
+}