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MdeModulePkg/VariableRuntimeDxe: implement standalone MM version
Reuse most of the existing code to implement a variable runtime driver that will be able to execute in the context of standalone MM. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
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Ard Biesheuvel
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/** @file
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Parts of the SMM/MM implementation that are specific to standalone MM
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Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR>
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Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "Variable.h"
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/**
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This function checks if the buffer is valid per processor architecture and
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does not overlap with SMRAM.
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@param Buffer The buffer start address to be checked.
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@param Length The buffer length to be checked.
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@retval TRUE This buffer is valid per processor architecture and does not
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overlap with SMRAM.
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@retval FALSE This buffer is not valid per processor architecture or overlaps
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with SMRAM.
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**/
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BOOLEAN
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VariableSmmIsBufferOutsideSmmValid (
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IN EFI_PHYSICAL_ADDRESS Buffer,
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IN UINT64 Length
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)
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{
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return TRUE;
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}
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/**
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Notify the system that the SMM variable driver is ready
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**/
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VOID
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VariableNotifySmmReady (
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VOID
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)
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{
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}
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/**
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Notify the system that the SMM variable write driver is ready
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**/
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VOID
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VariableNotifySmmWriteReady (
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VOID
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)
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{
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}
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/**
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Variable service MM driver entry point
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@param[in] ImageHandle A handle for the image that is initializing this
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driver
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@param[in] MmSystemTable A pointer to the MM system table
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@retval EFI_SUCCESS Variable service successfully initialized.
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**/
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EFI_STATUS
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EFIAPI
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VariableServiceInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_MM_SYSTEM_TABLE *MmSystemTable
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)
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{
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return MmVariableServiceInitialize ();
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}
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/**
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Whether the TCG or TCG2 protocols are installed in the UEFI protocol database.
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This information is used by the MorLock code to infer whether an existing
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MOR variable is legitimate or not.
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@retval TRUE Either the TCG or TCG2 protocol is installed in the UEFI
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protocol database
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@retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
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protocol database
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**/
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BOOLEAN
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VariableHaveTcgProtocols (
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VOID
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)
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{
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return FALSE;
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}
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## @file
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# Provides SMM variable service.
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#
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# This module installs SMM variable protocol into SMM protocol database,
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# which can be used by SMM driver, and installs SMM variable protocol
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# into BS protocol database, which can be used to notify the SMM Runtime
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# Dxe driver that the SMM variable service is ready.
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# This module should be used with SMM Runtime DXE module together. The
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# SMM Runtime DXE module would install variable arch protocol and variable
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# write arch protocol based on SMM variable module.
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#
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# Caution: This module requires additional review when modified.
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# This driver will have external input - variable data and communicate buffer in SMM mode.
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# This external input must be validated carefully to avoid security issues such as
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# buffer overflow or integer overflow.
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# The whole SMM authentication variable design relies on the integrity of flash part and SMM.
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# which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory
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# may not be modified without authorization. If platform fails to protect these resources,
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# the authentication service provided in this driver will be broken, and the behavior is undefined.
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#
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# Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR>
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# Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x0001001B
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BASE_NAME = VariableStandaloneMm
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FILE_GUID = 7ee2c0c1-c21a-4113-a53a-66824a95696f
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MODULE_TYPE = MM_STANDALONE
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VERSION_STRING = 1.0
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PI_SPECIFICATION_VERSION = 0x00010032
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ENTRY_POINT = VariableServiceInitialize
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64 ARM AARCH64
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#
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[Sources]
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Reclaim.c
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Variable.c
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VariableSmm.c
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VariableStandaloneMm.c
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VarCheck.c
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Variable.h
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PrivilegePolymorphic.h
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VariableExLib.c
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TcgMorLockSmm.c
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SpeculationBarrierSmm.c
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[Packages]
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MdePkg/MdePkg.dec
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MdeModulePkg/MdeModulePkg.dec
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StandaloneMmPkg/StandaloneMmPkg.dec
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[LibraryClasses]
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AuthVariableLib
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BaseLib
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BaseMemoryLib
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DebugLib
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HobLib
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MemoryAllocationLib
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MmServicesTableLib
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StandaloneMmDriverEntryPoint
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SynchronizationLib
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VarCheckLib
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[Protocols]
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gEfiSmmFirmwareVolumeBlockProtocolGuid ## CONSUMES
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## CONSUMES
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## NOTIFY
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gEfiSmmFaultTolerantWriteProtocolGuid
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## PRODUCES
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## UNDEFINED # SmiHandlerRegister
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gEfiSmmVariableProtocolGuid
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gEfiMmEndOfDxeProtocolGuid ## NOTIFY
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gEdkiiSmmVarCheckProtocolGuid ## PRODUCES
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[Guids]
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## SOMETIMES_CONSUMES ## GUID # Signature of Variable store header
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## SOMETIMES_PRODUCES ## GUID # Signature of Variable store header
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## SOMETIMES_CONSUMES ## HOB
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## SOMETIMES_PRODUCES ## SystemTable
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gEfiAuthenticatedVariableGuid
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## SOMETIMES_CONSUMES ## GUID # Signature of Variable store header
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## SOMETIMES_PRODUCES ## GUID # Signature of Variable store header
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## SOMETIMES_CONSUMES ## HOB
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## SOMETIMES_PRODUCES ## SystemTable
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gEfiVariableGuid
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## SOMETIMES_CONSUMES ## Variable:L"PlatformLang"
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## SOMETIMES_PRODUCES ## Variable:L"PlatformLang"
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## SOMETIMES_CONSUMES ## Variable:L"Lang"
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## SOMETIMES_PRODUCES ## Variable:L"Lang"
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gEfiGlobalVariableGuid
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gEfiMemoryOverwriteControlDataGuid ## SOMETIMES_CONSUMES ## Variable:L"MemoryOverwriteRequestControl"
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gEfiMemoryOverwriteRequestControlLockGuid ## SOMETIMES_PRODUCES ## Variable:L"MemoryOverwriteRequestControlLock"
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gEfiSystemNvDataFvGuid ## CONSUMES ## GUID
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gEdkiiFaultTolerantWriteGuid ## SOMETIMES_CONSUMES ## HOB
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## SOMETIMES_CONSUMES ## Variable:L"VarErrorFlag"
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## SOMETIMES_PRODUCES ## Variable:L"VarErrorFlag"
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gEdkiiVarErrorFlagGuid
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[FixedPcd]
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase ## SOMETIMES_CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64 ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVolatileVariableSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdMaxHardwareErrorVariableSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdHwErrStorageSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdMaxUserNvVariableSpaceSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdBoottimeReservedNvVariableSpaceSize ## CONSUMES
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gEfiMdeModulePkgTokenSpaceGuid.PcdReclaimVariableSpaceAtEndOfDxe ## CONSUMES
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[FeaturePcd]
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gEfiMdeModulePkgTokenSpaceGuid.PcdVariableCollectStatistics ## CONSUMES # statistic the information of variable.
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gEfiMdePkgTokenSpaceGuid.PcdUefiVariableDefaultLangDeprecate ## CONSUMES # Auto update PlatformLang/Lang
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[Depex]
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TRUE
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