--- xnu/xnu-344.26/libkern/c++/OSSerialize.cpp
+++ xnu/xnu-201.19.3/libkern/c++/OSSerialize.cpp
@@ -21,12 +21,6 @@
  */
 /* OSSerialize.cpp created by rsulack on Wen 25-Nov-1998 */
 
-#include <sys/cdefs.h>
-
-__BEGIN_DECLS
-#include <vm/vm_kern.h>
-__END_DECLS
-
 #include <libkern/c++/OSContainers.h>
 #include <libkern/c++/OSLib.h>
 #include <libkern/c++/OSDictionary.h>
@@ -148,14 +142,13 @@
 
     tag = 0;
     length = 1;
-    capacity = (inCapacity) ? round_page(inCapacity) : round_page(1);
-    capacityIncrement = capacity;
-
-    // allocate from the kernel map so that we can safely map this data
-    // into user space (the primary use of the OSSerialize object)
-    
-    kern_return_t rc = kmem_alloc(kernel_map, (vm_offset_t *)&data, capacity);
-    if (rc) {
+    capacity = inCapacity;
+    capacityIncrement = (capacity)? capacity : 256;
+
+    capacity = (((capacity - 1) / capacityIncrement) + 1)
+             * capacityIncrement;
+    data = (char *) kalloc(capacity);
+    if (!data) {
         tags->release();
         tags = 0;
         return false;
@@ -192,31 +185,25 @@
 unsigned int OSSerialize::ensureCapacity(unsigned int newCapacity)
 {
 	char *newData;
+	unsigned int oldCapacity;
 
 	if (newCapacity <= capacity)
 		return capacity;
 
 	// round up
-	newCapacity = round_page(newCapacity);
-
-	kern_return_t rc = kmem_realloc(kernel_map,
-					(vm_offset_t)data,
-					capacity,
-					(vm_offset_t *)&newData,
-					newCapacity);
-	if (!rc) {
-	    ACCUMSIZE(newCapacity);
-
-	    // kmem realloc does not free the old address range
-	    kmem_free(kernel_map, (vm_offset_t)data, capacity); 
-	    ACCUMSIZE(-capacity);
-	    
-	    // kmem realloc does not zero out the new memory
-	    // and this could end up going to user land
-	    bzero(&newData[capacity], newCapacity - capacity);
-		
-	    data = newData;
-	    capacity = newCapacity;
+	newCapacity = (((newCapacity - 1) / capacityIncrement) + 1)
+                * capacityIncrement;
+	newData = (char *) kalloc(newCapacity);
+	if (newData) {
+		oldCapacity = capacity;
+
+		ACCUMSIZE(newCapacity - oldCapacity);
+
+		bcopy(data, newData, oldCapacity);
+		bzero(&newData[capacity], newCapacity - oldCapacity);
+		kfree((vm_offset_t)data, oldCapacity);
+		data = newData;
+		capacity = newCapacity;
 	}
 
 	return capacity;
@@ -228,7 +215,7 @@
         tags->release();
 
     if (data) {
-	kmem_free(kernel_map, (vm_offset_t)data, capacity); 
+        kfree((vm_offset_t)data, capacity);
         ACCUMSIZE( -capacity );
     }
     super::free();