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ArmPkg/UncachedMemoryAllocationLib: restore mapping attributes after free 

In order to play nice with platforms that use strict memory permission
policies, restore the original mapping attributes when freeing uncached
allocations.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-02-28 12:13:10 +00:00
parent 29e9bf10dc
commit bb52ec2d6b
1 changed files with 7 additions and 9 deletions
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16
ArmPkg/Library/UncachedMemoryAllocationLib/UncachedMemoryAllocationLib.c
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@ -42,11 +42,6 @@ UncachedInternalAllocateAlignedPages (
//
// Assume all of memory has the same cache attributes, unless we do our magic
//
UINT64 gAttributes;
typedef struct {
EFI_PHYSICAL_ADDRESS Base;
VOID *Allocation;
@ -54,6 +49,7 @@ typedef struct {
EFI_MEMORY_TYPE MemoryType;
BOOLEAN Allocated;
LIST_ENTRY Link;
UINT64 Attributes;
} FREE_PAGE_NODE;
STATIC LIST_ENTRY mPageList = INITIALIZE_LIST_HEAD_VARIABLE (mPageList);
@ -153,10 +149,7 @@ AllocatePagesFromList (
}
Status = gDS->GetMemorySpaceDescriptor (Memory, &Descriptor);
if (!EFI_ERROR (Status)) {
// We are making an assumption that all of memory has the same default attributes
gAttributes = Descriptor.Attributes;
} else {
if (EFI_ERROR (Status)) {
gBS->FreePages (Memory, Pages);
return Status;
}
@ -181,6 +174,7 @@ AllocatePagesFromList (
NewNode->Pages = Pages;
NewNode->Allocated = TRUE;
NewNode->MemoryType = MemoryType;
NewNode->Attributes = Descriptor.Attributes;
InsertTailList (&mPageList, &NewNode->Link);
@ -266,6 +260,10 @@ UncachedMemoryAllocationLibDestructor (
// We only free the non-allocated buffer
if (OldNode->Allocated == FALSE) {
gBS->FreePages ((EFI_PHYSICAL_ADDRESS)(UINTN)OldNode->Base, OldNode->Pages);
gDS->SetMemorySpaceAttributes ((EFI_PHYSICAL_ADDRESS)(UINTN)OldNode->Base,
EFI_PAGES_TO_SIZE (OldNode->Pages), OldNode->Attributes);
RemoveEntryList (&OldNode->Link);
FreePool (OldNode);
}