/** @file\r
\r
-Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
\r
#include "PiSmmCpuDxeSmm.h"\r
\r
-#define NEXT_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
- ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) + (Size)))\r
+//\r
+// attributes for reserved memory before it is promoted to system memory\r
+//\r
+#define EFI_MEMORY_PRESENT 0x0100000000000000ULL\r
+#define EFI_MEMORY_INITIALIZED 0x0200000000000000ULL\r
+#define EFI_MEMORY_TESTED 0x0400000000000000ULL\r
\r
#define PREVIOUS_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) - (Size)))\r
UINTN mUefiMemoryMapSize;\r
UINTN mUefiDescriptorSize;\r
\r
+EFI_GCD_MEMORY_SPACE_DESCRIPTOR *mGcdMemSpace = NULL;\r
+UINTN mGcdMemNumberOfDesc = 0;\r
+\r
+EFI_MEMORY_ATTRIBUTES_TABLE *mUefiMemoryAttributesTable = NULL;\r
+\r
PAGE_ATTRIBUTE_TABLE mPageAttributeTable[] = {\r
{Page4K, SIZE_4KB, PAGING_4K_ADDRESS_MASK_64},\r
{Page2M, SIZE_2MB, PAGING_2M_ADDRESS_MASK_64},\r
{Page1G, SIZE_1GB, PAGING_1G_ADDRESS_MASK_64},\r
};\r
\r
+UINTN mInternalGr3;\r
+\r
+/**\r
+ Set the internal page table base address.\r
+ If it is non zero, further MemoryAttribute modification will be on this page table.\r
+ If it is zero, further MemoryAttribute modification will be on real page table.\r
+\r
+ @param Cr3 page table base.\r
+**/\r
+VOID\r
+SetPageTableBase (\r
+ IN UINTN Cr3\r
+ )\r
+{\r
+ mInternalGr3 = Cr3;\r
+}\r
+\r
/**\r
Return page table base.\r
\r
VOID\r
)\r
{\r
+ if (mInternalGr3 != 0) {\r
+ return mInternalGr3;\r
+ }\r
return (AsmReadCr3 () & PAGING_4K_ADDRESS_MASK_64);\r
}\r
\r
if ((Attributes & EFI_MEMORY_RO) != 0) {\r
if (IsSet) {\r
NewPageEntry &= ~(UINT64)IA32_PG_RW;\r
+ if (mInternalGr3 != 0) {\r
+ // Environment setup\r
+ // ReadOnly page need set Dirty bit for shadow stack\r
+ NewPageEntry |= IA32_PG_D;\r
+ // Clear user bit for supervisor shadow stack\r
+ NewPageEntry &= ~(UINT64)IA32_PG_U;\r
+ } else {\r
+ // Runtime update\r
+ // Clear dirty bit for non shadow stack, to protect RO page.\r
+ NewPageEntry &= ~(UINT64)IA32_PG_D;\r
+ }\r
} else {\r
NewPageEntry |= IA32_PG_RW;\r
}\r
return SmmClearMemoryAttributesEx (BaseAddress, Length, Attributes, NULL);\r
}\r
\r
+/**\r
+ Set ShadowStack memory.\r
\r
+ @param[in] Cr3 The page table base address.\r
+ @param[in] BaseAddress The physical address that is the start address of a memory region.\r
+ @param[in] Length The size in bytes of the memory region.\r
+\r
+ @retval EFI_SUCCESS The shadow stack memory is set.\r
+**/\r
+EFI_STATUS\r
+SetShadowStack (\r
+ IN UINTN Cr3,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ SetPageTableBase (Cr3);\r
+\r
+ Status = SmmSetMemoryAttributes (BaseAddress, Length, EFI_MEMORY_RO);\r
+\r
+ SetPageTableBase (0);\r
+\r
+ return Status;\r
+}\r
+\r
+/**\r
+ Set not present memory.\r
+\r
+ @param[in] Cr3 The page table base address.\r
+ @param[in] BaseAddress The physical address that is the start address of a memory region.\r
+ @param[in] Length The size in bytes of the memory region.\r
+\r
+ @retval EFI_SUCCESS The not present memory is set.\r
+**/\r
+EFI_STATUS\r
+SetNotPresentPage (\r
+ IN UINTN Cr3,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ SetPageTableBase (Cr3);\r
+\r
+ Status = SmmSetMemoryAttributes (BaseAddress, Length, EFI_MEMORY_RP);\r
+\r
+ SetPageTableBase (0);\r
+\r
+ return Status;\r
+}\r
\r
/**\r
Retrieves a pointer to the system configuration table from the SMM System Table\r
return ;\r
}\r
\r
+/**\r
+ This function caches the GCD memory map information.\r
+**/\r
+VOID\r
+GetGcdMemoryMap (\r
+ VOID\r
+ )\r
+{\r
+ UINTN NumberOfDescriptors;\r
+ EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemSpaceMap;\r
+ EFI_STATUS Status;\r
+ UINTN Index;\r
+\r
+ Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemSpaceMap);\r
+ if (EFI_ERROR (Status)) {\r
+ return ;\r
+ }\r
+\r
+ mGcdMemNumberOfDesc = 0;\r
+ for (Index = 0; Index < NumberOfDescriptors; Index++) {\r
+ if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved &&\r
+ (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==\r
+ (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED)\r
+ ) {\r
+ mGcdMemNumberOfDesc++;\r
+ }\r
+ }\r
+\r
+ mGcdMemSpace = AllocateZeroPool (mGcdMemNumberOfDesc * sizeof (EFI_GCD_MEMORY_SPACE_DESCRIPTOR));\r
+ ASSERT (mGcdMemSpace != NULL);\r
+ if (mGcdMemSpace == NULL) {\r
+ mGcdMemNumberOfDesc = 0;\r
+ gBS->FreePool (MemSpaceMap);\r
+ return ;\r
+ }\r
+\r
+ mGcdMemNumberOfDesc = 0;\r
+ for (Index = 0; Index < NumberOfDescriptors; Index++) {\r
+ if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved &&\r
+ (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==\r
+ (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED)\r
+ ) {\r
+ CopyMem (\r
+ &mGcdMemSpace[mGcdMemNumberOfDesc],\r
+ &MemSpaceMap[Index],\r
+ sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR)\r
+ );\r
+ mGcdMemNumberOfDesc++;\r
+ }\r
+ }\r
+\r
+ gBS->FreePool (MemSpaceMap);\r
+}\r
+\r
+/**\r
+ Get UEFI MemoryAttributesTable.\r
+**/\r
+VOID\r
+GetUefiMemoryAttributesTable (\r
+ VOID\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_MEMORY_ATTRIBUTES_TABLE *MemoryAttributesTable;\r
+ UINTN MemoryAttributesTableSize;\r
+\r
+ Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable);\r
+ if (!EFI_ERROR (Status) && (MemoryAttributesTable != NULL)) {\r
+ MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries;\r
+ mUefiMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable);\r
+ ASSERT (mUefiMemoryAttributesTable != NULL);\r
+ }\r
+}\r
+\r
/**\r
This function caches the UEFI memory map information.\r
**/\r
ASSERT (mUefiMemoryMap != NULL);\r
\r
gBS->FreePool (MemoryMap);\r
+\r
+ //\r
+ // Get additional information from GCD memory map.\r
+ //\r
+ GetGcdMemoryMap ();\r
+\r
+ //\r
+ // Get UEFI memory attributes table.\r
+ //\r
+ GetUefiMemoryAttributesTable ();\r
}\r
\r
/**\r
EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
UINTN MemoryMapEntryCount;\r
UINTN Index;\r
+ EFI_MEMORY_DESCRIPTOR *Entry;\r
\r
DEBUG ((DEBUG_INFO, "SetUefiMemMapAttributes\n"));\r
\r
- if (mUefiMemoryMap == NULL) {\r
- DEBUG ((DEBUG_INFO, "UefiMemoryMap - NULL\n"));\r
- return ;\r
+ if (mUefiMemoryMap != NULL) {\r
+ MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
+ MemoryMap = mUefiMemoryMap;\r
+ for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
+ if (IsUefiPageNotPresent(MemoryMap)) {\r
+ Status = SmmSetMemoryAttributes (\r
+ MemoryMap->PhysicalStart,\r
+ EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ EFI_MEMORY_RP\r
+ );\r
+ DEBUG ((\r
+ DEBUG_INFO,\r
+ "UefiMemory protection: 0x%lx - 0x%lx %r\n",\r
+ MemoryMap->PhysicalStart,\r
+ MemoryMap->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ Status\r
+ ));\r
+ }\r
+ MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
}\r
+ //\r
+ // Do not free mUefiMemoryMap, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ //\r
\r
- MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
- MemoryMap = mUefiMemoryMap;\r
- for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
- if (IsUefiPageNotPresent(MemoryMap)) {\r
+ //\r
+ // Set untested memory as not present.\r
+ //\r
+ if (mGcdMemSpace != NULL) {\r
+ for (Index = 0; Index < mGcdMemNumberOfDesc; Index++) {\r
Status = SmmSetMemoryAttributes (\r
- MemoryMap->PhysicalStart,\r
- EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ mGcdMemSpace[Index].BaseAddress,\r
+ mGcdMemSpace[Index].Length,\r
EFI_MEMORY_RP\r
);\r
DEBUG ((\r
DEBUG_INFO,\r
- "UefiMemory protection: 0x%lx - 0x%lx %r\n",\r
- MemoryMap->PhysicalStart,\r
- MemoryMap->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ "GcdMemory protection: 0x%lx - 0x%lx %r\n",\r
+ mGcdMemSpace[Index].BaseAddress,\r
+ mGcdMemSpace[Index].BaseAddress + mGcdMemSpace[Index].Length,\r
Status\r
));\r
}\r
- MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
}\r
+ //\r
+ // Do not free mGcdMemSpace, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ //\r
\r
//\r
- // Do free mUefiMemoryMap, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ // Set UEFI runtime memory with EFI_MEMORY_RO as not present.\r
+ //\r
+ if (mUefiMemoryAttributesTable != NULL) {\r
+ Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1);\r
+ for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) {\r
+ if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) {\r
+ if ((Entry->Attribute & EFI_MEMORY_RO) != 0) {\r
+ Status = SmmSetMemoryAttributes (\r
+ Entry->PhysicalStart,\r
+ EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages),\r
+ EFI_MEMORY_RP\r
+ );\r
+ DEBUG ((\r
+ DEBUG_INFO,\r
+ "UefiMemoryAttribute protection: 0x%lx - 0x%lx %r\n",\r
+ Entry->PhysicalStart,\r
+ Entry->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages),\r
+ Status\r
+ ));\r
+ }\r
+ }\r
+ Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize);\r
+ }\r
+ }\r
+ //\r
+ // Do not free mUefiMemoryAttributesTable, it will be checked in IsSmmCommBufferForbiddenAddress().\r
//\r
}\r
\r
EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
UINTN MemoryMapEntryCount;\r
UINTN Index;\r
-\r
- if (mUefiMemoryMap == NULL) {\r
- return FALSE;\r
+ EFI_MEMORY_DESCRIPTOR *Entry;\r
+\r
+ if (mUefiMemoryMap != NULL) {\r
+ MemoryMap = mUefiMemoryMap;\r
+ MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
+ for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
+ if (IsUefiPageNotPresent (MemoryMap)) {\r
+ if ((Address >= MemoryMap->PhysicalStart) &&\r
+ (Address < MemoryMap->PhysicalStart + EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages)) ) {\r
+ return TRUE;\r
+ }\r
+ }\r
+ MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
}\r
\r
- MemoryMap = mUefiMemoryMap;\r
- MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
- for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
- if (IsUefiPageNotPresent (MemoryMap)) {\r
- if ((Address >= MemoryMap->PhysicalStart) &&\r
- (Address < MemoryMap->PhysicalStart + EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages)) ) {\r
+ if (mGcdMemSpace != NULL) {\r
+ for (Index = 0; Index < mGcdMemNumberOfDesc; Index++) {\r
+ if ((Address >= mGcdMemSpace[Index].BaseAddress) &&\r
+ (Address < mGcdMemSpace[Index].BaseAddress + mGcdMemSpace[Index].Length) ) {\r
return TRUE;\r
}\r
}\r
- MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
+\r
+ if (mUefiMemoryAttributesTable != NULL) {\r
+ Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1);\r
+ for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) {\r
+ if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) {\r
+ if ((Entry->Attribute & EFI_MEMORY_RO) != 0) {\r
+ if ((Address >= Entry->PhysicalStart) &&\r
+ (Address < Entry->PhysicalStart + LShiftU64 (Entry->NumberOfPages, EFI_PAGE_SHIFT))) {\r
+ return TRUE;\r
+ }\r
+ Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize);\r
+ }\r
+ }\r
+ }\r
}\r
return FALSE;\r
}\r
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