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UefiCpuPkg/CpuDxe: fix SetMemoryAttributes issue in 32-bit mode 

In 32-bit mode, the BIOS will not create page table for memory beyond
4GB and therefore it cannot handle the attributes change request for
those memory. But current CpuDxe doesn't check this situation and still
try to complete the request, which will cause attributes of incorrect
memory address to be changed due to type cast from 64-bit to 32-bit.

This patch fixes this issue by checking the end address of input
memory block and returning EFI_UNSUPPORTED if it's out of range.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
This commit is contained in:
Jian J Wang 2018-01-16 10:45:56 +08:00 committed by Ruiyu Ni
parent 1dbd423fbb
commit 4f10654e04
1 changed files with 4 additions and 0 deletions
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4
UefiCpuPkg/CpuDxe/CpuPageTable.c
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@ -699,6 +699,10 @@ ConvertMemoryPageAttributes (
DEBUG ((DEBUG_ERROR, "Non-PAE Paging!\n"));
return EFI_UNSUPPORTED;
}
if ((BaseAddress + Length) > BASE_4GB) {
DEBUG ((DEBUG_ERROR, "Beyond 4GB memory in 32-bit mode!\n"));
return EFI_UNSUPPORTED;
}
break;
case IMAGE_FILE_MACHINE_X64:
ASSERT (CurrentPagingContext.ContextData.X64.PageTableBase != 0);