In PiSmmCpuDxeSmm code, SetMemMapAttributes() marks memory ranges
in SmmMemoryAttributesTable to RO/NX. There may exist non-present
range in these memory ranges. Set other attributes for a non-present
range is not permitted in CpuPageTableMapLib. So add code to handle
this case. Only map the present ranges in SmmMemoryAttributesTable
to RO or NX.
Signed-off-by: Dun Tan <dun....@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
---
UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c | 141
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------
1 file changed, 119 insertions(+), 22 deletions(-)
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
index deb5895d83..89040d386e 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
@@ -858,6 +858,89 @@ PatchGdtIdtMap (
);
}
+/**
+ This function remove the non-present range in [MemMapStart, MemMapLimit] and
+ set [MemMapStart, NonPresentRangeStart] as MemoryAttribute in page table.
+
+ @param MemMapStart Pointer to the start address of range.
+ @param MemMapLimit Limit address of range.
+ @param NonPresentRangeStart Start address of non-present range.
+ @param NonPresentRangeLimit Limit address of non-present range.
+ @param MemoryAttribute The bit mask of attributes to modify for
the memory region.
+
+**/
+VOID
+RemoveNonPresentRange (
+ UINT64 *MemMapStart,
+ UINT64 MemMapLimit,
+ UINT64 NonPresentRangeStart,
+ UINT64 NonPresentRangeLimit,
+ UINT64 MemoryAttribute
+ )
+{
+ if (*MemMapStart < NonPresentRangeStart) {
+ SmmSetMemoryAttributes (
+ *MemMapStart,
+ NonPresentRangeStart - *MemMapStart,
+ MemoryAttribute
+ );
+ }
+
+ *MemMapStart = NonPresentRangeLimit;
+}
+
+/**
+ This function set [MemMapStart, MemMapLimit] to the input MemoryAttribute.
+
+ @param MemMapStart Start address of range.
+ @param MemMapLimit Limit address of range.
+ @param Map Pointer to the array of Cr3 IA32_MAP_ENTRY.
+ @param Count Count of IA32_MAP_ENTRY in Map.
+ @param MemoryAttribute The bit mask of attributes to modify for the
memory region.
+
+**/
+VOID
+SetMemMapWithNonPresentRange (
+ UINT64 MemMapStart,
+ UINT64 MemMapLimit,
+ IA32_MAP_ENTRY *Map,
+ UINTN Count,
+ UINT64 MemoryAttribute
+ )
+{
+ UINTN Index;
+ UINT64 NonPresentRangeStart;
+
+ NonPresentRangeStart = 0;
+
+ for (Index = 0; Index < Count; Index++) {
+ if ((Map[Index].LinearAddress > NonPresentRangeStart) &&
+ (MemMapStart < Map[Index].LinearAddress) && (MemMapLimit >
NonPresentRangeStart))
+ {
+ //
+ // [NonPresentRangeStart, Map[Index].LinearAddress] is non-present.
+ //
+ RemoveNonPresentRange (&MemMapStart, MemMapLimit, NonPresentRangeStart,
Map[Index].LinearAddress, MemoryAttribute);
+ }
+
+ NonPresentRangeStart = Map[Index].LinearAddress + Map[Index].Length;
+ if (NonPresentRangeStart >= MemMapLimit) {
+ break;
+ }
+ }
+
+ //
+ // There is no non-present in current [MemMapStart, MemMapLimit] anymore.
+ //
+ if (MemMapStart < MemMapLimit) {
+ SmmSetMemoryAttributes (
+ MemMapStart,
+ MemMapLimit - MemMapStart,
+ MemoryAttribute
+ );
+ }
+}
+
/**
This function sets memory attribute according to MemoryAttributesTable.
**/
@@ -872,6 +955,21 @@ SetMemMapAttributes (
UINTN DescriptorSize;
UINTN Index;
EDKII_PI_SMM_MEMORY_ATTRIBUTES_TABLE *MemoryAttributesTable;
+ UINTN PageTable;
+ EFI_STATUS Status;
+ IA32_MAP_ENTRY *Map;
+ UINTN Count;
+ UINT64 MemoryAttribute;
+
+ Count = 0;
+ Map = NULL;
+ PageTable = AsmReadCr3 ();
+ Status = PageTableParse (PageTable, mPagingMode, NULL, &Count);
+ ASSERT (Status == RETURN_BUFFER_TOO_SMALL);
+ Map = AllocatePool (Count * sizeof (IA32_MAP_ENTRY));
+ ASSERT (Map != NULL);
+ Status = PageTableParse (PageTable, mPagingMode, Map, &Count);
+ ASSERT_RETURN_ERROR (Status);
SmmGetSystemConfigurationTable (&gEdkiiPiSmmMemoryAttributesTableGuid, (VOID
**)&MemoryAttributesTable);
if (MemoryAttributesTable == NULL) {
@@ -901,33 +999,32 @@ SetMemMapAttributes (
MemoryMap = MemoryMapStart;
for (Index = 0; Index < MemoryMapEntryCount; Index++) {
DEBUG ((DEBUG_VERBOSE, "SetAttribute: Memory Entry - 0x%lx, 0x%x\n",
MemoryMap->PhysicalStart, MemoryMap->NumberOfPages));
- switch (MemoryMap->Type) {
- case EfiRuntimeServicesCode:
- SmmSetMemoryAttributes (
- MemoryMap->PhysicalStart,
- EFI_PAGES_TO_SIZE ((UINTN)MemoryMap->NumberOfPages),
- EFI_MEMORY_RO
- );
- break;
- case EfiRuntimeServicesData:
- SmmSetMemoryAttributes (
- MemoryMap->PhysicalStart,
- EFI_PAGES_TO_SIZE ((UINTN)MemoryMap->NumberOfPages),
- EFI_MEMORY_XP
- );
- break;
- default:
- SmmSetMemoryAttributes (
- MemoryMap->PhysicalStart,
- EFI_PAGES_TO_SIZE ((UINTN)MemoryMap->NumberOfPages),
- EFI_MEMORY_XP
- );
- break;
+ if (MemoryMap->Type == EfiRuntimeServicesCode) {
+ MemoryAttribute = EFI_MEMORY_RO;
+ } else {
+ //
+ // Set other type memory as NX.
+ //
+ MemoryAttribute = EFI_MEMORY_XP;
}
+ //
+ // There may exist non-present range overlaps with the MemoryMap range.
+ // Do not change other attributes of non-present range while still
remaining it as non-present
+ //
+ SetMemMapWithNonPresentRange (
+ MemoryMap->PhysicalStart,
+ MemoryMap->PhysicalStart + EFI_PAGES_TO_SIZE
((UINTN)MemoryMap->NumberOfPages),
+ Map,
+ Count,
+ MemoryAttribute
+ );
+
MemoryMap = NEXT_MEMORY_DESCRIPTOR (MemoryMap, DescriptorSize);
}
+ FreePool (Map);
+
PatchSmmSaveStateMap ();
PatchGdtIdtMap ();
--
2.39.1.windows.1
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