tyler.durden
/
audk
mirror of https://github.com/acidanthera/audk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

UefiCpuPkg/PiSmmCpuDxeSmm: Avoid setting non-present range to RO/NX 

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.tan@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Dun Tan 2023-04-07 15:42:00 +08:00 committed by Ray Ni
parent 6585ced558
commit f51967280b
1 changed files with 107 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

129
UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
View File

@ -918,6 +918,70 @@ PatchGdtIdtMap (
);
}
/**
This function set [Base, Limit] to the input MemoryAttribute.
@param Base Start address of range.
@param Limit Limit address of range.
@param Attribute The bit mask of attributes to modify for the memory region.
@param Map Pointer to the array of Cr3 IA32_MAP_ENTRY.
@param Count Count of IA32_MAP_ENTRY in Map.
**/
VOID
SetMemMapWithNonPresentRange (
UINT64 Base,
UINT64 Limit,
UINT64 Attribute,
IA32_MAP_ENTRY *Map,
UINTN Count
)
{
UINTN Index;
UINT64 NonPresentRangeStart;
NonPresentRangeStart = 0;
for (Index = 0; Index < Count; Index++) {
if ((Map[Index].LinearAddress > NonPresentRangeStart) &&
(Base < Map[Index].LinearAddress) && (Limit > NonPresentRangeStart))
{
//
// We should NOT set attributes for non-present ragne.
//
//
// There is a non-present ( [NonPresentStart, Map[Index].LinearAddress] ) range before current Map[Index]
// and it is overlapped with [Base, Limit].
//
if (Base < NonPresentRangeStart) {
SmmSetMemoryAttributes (
Base,
NonPresentRangeStart - Base,
Attribute
);
}
Base = Map[Index].LinearAddress;
}
NonPresentRangeStart = Map[Index].LinearAddress + Map[Index].Length;
if (NonPresentRangeStart >= Limit) {
break;
}
}
Limit = MIN (NonPresentRangeStart, Limit);
if (Base < Limit) {
//
// There is no non-present range in current [Base, Limit] anymore.
//
SmmSetMemoryAttributes (
Base,
Limit - Base,
Attribute
);
}
}
/**
This function sets memory attribute according to MemoryAttributesTable.
**/
@ -932,6 +996,11 @@ 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;
SmmGetSystemConfigurationTable (&gEdkiiPiSmmMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable);
if (MemoryAttributesTable == NULL) {
@ -960,36 +1029,52 @@ SetMemMapAttributes (
MemoryMap = NEXT_MEMORY_DESCRIPTOR (MemoryMap, DescriptorSize);
}
Count = 0;
Map = NULL;
PageTable = AsmReadCr3 ();
Status = PageTableParse (PageTable, mPagingMode, NULL, &Count);
while (Status == RETURN_BUFFER_TOO_SMALL) {
if (Map != NULL) {
FreePool (Map);
}
Map = AllocatePool (Count * sizeof (IA32_MAP_ENTRY));
ASSERT (Map != NULL);
Status = PageTableParse (PageTable, mPagingMode, Map, &Count);
}
ASSERT_RETURN_ERROR (Status);
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 {
ASSERT ((MemoryMap->Type == EfiRuntimeServicesData) || (MemoryMap->Type == EfiConventionalMemory));
//
// 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),
MemoryAttribute,
Map,
Count
);
MemoryMap = NEXT_MEMORY_DESCRIPTOR (MemoryMap, DescriptorSize);
}
FreePool (Map);
PatchSmmSaveStateMap ();
PatchGdtIdtMap ();