ArmPkg/ArmMmuLib ARM: disregard high memory when setting permissions

Ignore calls to ArmSetMemoryAttributes () when the region described
is outside of the 32-bit addressable range. This memory is not
mapped in the first place, and the current code does not deal with
the high bits correctly, resulting in hangs.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Library/ArmMmuLib/Arm/ArmMmuLibCore.c

@@ -744,6 +744,10 @@ ArmSetMemoryAttributes (
   UINT64        ChunkLength;
   BOOLEAN       FlushTlbs;
 
+  if (BaseAddress > (UINT64)MAX_ADDRESS - Length + 1) {
+    return EFI_UNSUPPORTED;
+  }
+
   if (Length == 0) {
     return EFI_SUCCESS;
   }