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Truncate EFI memory descriptor to 4GB and never map EFI reserved memory like PCI BAR
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This commit is contained in:
Rafal Kupiec 2024-03-26 23:04:54 +01:00
parent 306891c9eb
commit 1cdc1d3e54
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
1 changed files with 20 additions and 5 deletions
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21
xtldr/memory.c
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@ -314,9 +314,24 @@ BlMapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
/* Iterate through all descriptors from the memory map */
for(Index = 0; Index < DescriptorCount; Index++)
{
/* Make sure descriptor does not go beyond lowest physical page */
if((Descriptor->PhysicalStart + (Descriptor->NumberOfPages * EFI_PAGE_SIZE)) <= (UINT_PTR)-1)
/* Make sure descriptor does not start beyond lowest physical page */
if(Descriptor->PhysicalStart <= MAXUINT_PTR)
{
/* Skip EFI reserved memory */
if(Descriptor->Type == EfiReservedMemoryType)
{
/* Go to the next descriptor */
Descriptor = (PEFI_MEMORY_DESCRIPTOR)((PUCHAR)Descriptor + MemoryMap->DescriptorSize);
continue;
}
/* Check if memory descriptor exceeds the lowest physical page */
if(Descriptor->PhysicalStart + (Descriptor->NumberOfPages << EFI_PAGE_SHIFT) > MAXUINT_PTR)
{
/* Truncate memory descriptor to the 4GB */
Descriptor->NumberOfPages = ((MAXUINT_PTR + 1) - Descriptor->PhysicalStart) >> EFI_PAGE_SHIFT;
}
/* Convert EFI memory type into XTLDR memory type */
MemoryType = GetMemoryTypeRoutine(Descriptor->Type);
@ -349,11 +364,11 @@ BlMapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
/* Mapping failed */
return Status;
}
}
/* Grab next descriptor */
Descriptor = (PEFI_MEMORY_DESCRIPTOR)((PUCHAR)Descriptor + MemoryMap->DescriptorSize);
}
}
/* Always map first page */
Status = BlMapVirtualMemory(PageMap, NULL, (PVOID)0, 1, LoaderFirmwarePermanent);