ntoskrnl.exe: Implement MmIsAddressValid.

dlls/ntoskrnl.exe/ntoskrnl.c

@@ -561,6 +561,25 @@ void WINAPI MmFreeNonCachedMemory( void *addr, SIZE_T size )
     VirtualFree( addr, 0, MEM_RELEASE );
 }
 
+/***********************************************************************
+ *           MmIsAddressValid   (NTOSKRNL.EXE.@)
+ *
+ * Check if the process can access the virtual address without a pagefault
+ *
+ * PARAMS
+ *  VirtualAddress [I] Address to check
+ *
+ * RETURNS
+ *  Failure: FALSE
+ *  Success: TRUE  (Accessing the Address works without a Pagefault)
+ *
+ */
+BOOLEAN WINAPI MmIsAddressValid(PVOID VirtualAddress)
+{
+    TRACE("(%p)\n", VirtualAddress);
+    return !IsBadWritePtr(VirtualAddress, 1);
+}
+
 /***********************************************************************
  *           MmPageEntireDriver   (NTOSKRNL.EXE.@)
  */

dlls/ntoskrnl.exe/ntoskrnl.exe.spec

@@ -679,7 +679,7 @@
 @ stub MmGetVirtualForPhysical
 @ stub MmGrowKernelStack
 @ stub MmHighestUserAddress
-@ stub MmIsAddressValid
+@ stdcall MmIsAddressValid(ptr)
 @ stub MmIsDriverVerifying
 @ stub MmIsNonPagedSystemAddressValid
 @ stub MmIsRecursiveIoFault