From 8a2e1a9d54ee7316c48111b1f216a568791b2da2 Mon Sep 17 00:00:00 2001 From: Jiewen Yao Date: Wed, 22 Nov 2017 23:11:54 +0800 Subject: UefiCpuPkg/PiSmmCpu: Check EFI_RUNTIME_RO in UEFI mem attrib table. It treats the UEFI runtime page with EFI_MEMORY_RO attribute as invalid SMM communication buffer. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jiewen Yao Reviewed-by: Star Zeng --- UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 2 + UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf | 1 + UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c | 75 +++++++++++++++++++++- 3 files changed, 75 insertions(+), 3 deletions(-) (limited to 'UefiCpuPkg') diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h index 1d016594e0..e3c7cff81c 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h @@ -28,6 +28,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include #include +#include #include #include @@ -45,6 +46,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include #include #include +#include #include #include #include diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf index 52d8c55075..a7fb7b0b14 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf @@ -117,6 +117,7 @@ gEfiAcpi20TableGuid ## SOMETIMES_CONSUMES ## SystemTable gEfiAcpi10TableGuid ## SOMETIMES_CONSUMES ## SystemTable gEdkiiPiSmmMemoryAttributesTableGuid ## CONSUMES ## SystemTable + gEfiMemoryAttributesTableGuid ## CONSUMES ## SystemTable [FeaturePcd] gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmDebug ## CONSUMES diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c index b2ace6334e..7d99f23426 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c @@ -20,9 +20,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #define EFI_MEMORY_INITIALIZED 0x0200000000000000ULL #define EFI_MEMORY_TESTED 0x0400000000000000ULL -#define NEXT_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \ - ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) + (Size))) - #define PREVIOUS_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \ ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) - (Size))) @@ -33,6 +30,8 @@ UINTN mUefiDescriptorSize; EFI_GCD_MEMORY_SPACE_DESCRIPTOR *mGcdMemSpace = NULL; UINTN mGcdMemNumberOfDesc = 0; +EFI_MEMORY_ATTRIBUTES_TABLE *mUefiMemoryAttributesTable = NULL; + PAGE_ATTRIBUTE_TABLE mPageAttributeTable[] = { {Page4K, SIZE_4KB, PAGING_4K_ADDRESS_MASK_64}, {Page2M, SIZE_2MB, PAGING_2M_ADDRESS_MASK_64}, @@ -1086,6 +1085,26 @@ GetGcdMemoryMap ( gBS->FreePool (MemSpaceMap); } +/** + Get UEFI MemoryAttributesTable. +**/ +VOID +GetUefiMemoryAttributesTable ( + VOID + ) +{ + EFI_STATUS Status; + EFI_MEMORY_ATTRIBUTES_TABLE *MemoryAttributesTable; + UINTN MemoryAttributesTableSize; + + Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable); + if (!EFI_ERROR (Status)) { + MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries; + mUefiMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable); + ASSERT (mUefiMemoryAttributesTable != NULL); + } +} + /** This function caches the UEFI memory map information. **/ @@ -1150,6 +1169,11 @@ GetUefiMemoryMap ( // Get additional information from GCD memory map. // GetGcdMemoryMap (); + + // + // Get UEFI memory attributes table. + // + GetUefiMemoryAttributesTable (); } /** @@ -1168,6 +1192,7 @@ SetUefiMemMapAttributes ( EFI_MEMORY_DESCRIPTOR *MemoryMap; UINTN MemoryMapEntryCount; UINTN Index; + EFI_MEMORY_DESCRIPTOR *Entry; DEBUG ((DEBUG_INFO, "SetUefiMemMapAttributes\n")); @@ -1218,6 +1243,35 @@ SetUefiMemMapAttributes ( // // Do not free mGcdMemSpace, it will be checked in IsSmmCommBufferForbiddenAddress(). // + + // + // Set UEFI runtime memory with EFI_MEMORY_RO as not present. + // + if (mUefiMemoryAttributesTable != NULL) { + Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1); + for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) { + if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) { + if ((Entry->Attribute & EFI_MEMORY_RO) != 0) { + Status = SmmSetMemoryAttributes ( + Entry->PhysicalStart, + EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages), + EFI_MEMORY_RP + ); + DEBUG (( + DEBUG_INFO, + "UefiMemoryAttribute protection: 0x%lx - 0x%lx %r\n", + Entry->PhysicalStart, + Entry->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages), + Status + )); + } + } + Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize); + } + } + // + // Do not free mUefiMemoryAttributesTable, it will be checked in IsSmmCommBufferForbiddenAddress(). + // } /** @@ -1236,6 +1290,7 @@ IsSmmCommBufferForbiddenAddress ( EFI_MEMORY_DESCRIPTOR *MemoryMap; UINTN MemoryMapEntryCount; UINTN Index; + EFI_MEMORY_DESCRIPTOR *Entry; if (mUefiMemoryMap != NULL) { MemoryMap = mUefiMemoryMap; @@ -1260,6 +1315,20 @@ IsSmmCommBufferForbiddenAddress ( } } + if (mUefiMemoryAttributesTable != NULL) { + Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1); + for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) { + if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) { + if ((Entry->Attribute & EFI_MEMORY_RO) != 0) { + if ((Address >= Entry->PhysicalStart) && + (Address < Entry->PhysicalStart + LShiftU64 (Entry->NumberOfPages, EFI_PAGE_SHIFT))) { + return TRUE; + } + Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize); + } + } + } + } return FALSE; } -- cgit v1.2.3