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CpuPageTableLib: Avoid treating non-leaf entry as leaf one 

Today's logic wrongly treats the non-leaf entry as leaf entry and
updates its paging attributes.

The patch fixes the bug to only update paging attributes for
non-present entries or leaf entries.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
This commit is contained in:
Ray Ni 2022-07-15 15:22:57 +08:00 committed by mergify[bot]
parent 9cb8974f06
commit c16f02f776
1 changed files with 7 additions and 4 deletions
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11
UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
View File

@ -248,6 +248,7 @@ PageTableLibMapInLevel (
UINTN BitStart;
UINTN Index;
IA32_PAGING_ENTRY *PagingEntry;
IA32_PAGING_ENTRY *CurrentPagingEntry;
UINT64 RegionLength;
UINT64 SubLength;
UINT64 SubOffset;
@ -359,18 +360,20 @@ PageTableLibMapInLevel (
//
PagingEntry = (IA32_PAGING_ENTRY *)(UINTN)IA32_PNLE_PAGE_TABLE_BASE_ADDRESS (&ParentPagingEntry->Pnle);
while (Offset < Length && Index < 512) {
SubLength = MIN (Length - Offset, RegionStart + RegionLength - (LinearAddress + Offset));
CurrentPagingEntry = (!Modify && CreateNew) ? &OneOfPagingEntry : &PagingEntry[Index];
SubLength = MIN (Length - Offset, RegionStart + RegionLength - (LinearAddress + Offset));
if ((Level <= MaxLeafLevel) &&
(((LinearAddress + Offset) & RegionMask) == 0) &&
(((IA32_MAP_ATTRIBUTE_PAGE_TABLE_BASE_ADDRESS (Attribute) + Offset) & RegionMask) == 0) &&
(SubLength == RegionLength)
(SubLength == RegionLength) &&
((CurrentPagingEntry->Pce.Present == 0) || IsPle (CurrentPagingEntry, Level))
)
{
//
// Create one entry mapping the entire region (1G, 2M or 4K).
//
if (Modify) {
PageTableLibSetPle (Level, &PagingEntry[Index], Offset, Attribute, Mask);
PageTableLibSetPle (Level, CurrentPagingEntry, Offset, Attribute, Mask);
}
} else {
//
@ -382,7 +385,7 @@ PageTableLibMapInLevel (
// but the length is SMALLER than the RegionLength.
//
Status = PageTableLibMapInLevel (
(!Modify && CreateNew) ? &OneOfPagingEntry : &PagingEntry[Index],
CurrentPagingEntry,
Modify,
Buffer,
BufferSize,