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.biesheu...@linaro.org> --- MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.c | 69 ++++++++++ MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.inf | 135 ++++++++++++++++++++ 2 files changed, 204 insertions(+) diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.c new file mode 100644 index 000000000000..fbc99467c057 --- /dev/null +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.c @@ -0,0 +1,69 @@ +/** @file + + Parts of the SMM/MM implementation that are specific to standalone MM + +Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR> +Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR> +This program and the accompanying materials +are licensed and made available under the terms and conditions of the BSD License +which accompanies this distribution. The full text of the license may be found at +http://opensource.org/licenses/bsd-license.php + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#include "Variable.h" + +BOOLEAN +VariableSmmIsBufferOutsideSmmValid ( + IN EFI_PHYSICAL_ADDRESS Buffer, + IN UINT64 Length + ) +{ + return TRUE; +} + +/** + Notify the system that the SMM variable driver is ready +**/ +VOID +VariableNotifySmmReady ( + VOID + ) +{ +} + +/** + Notify the system that the SMM variable write driver is ready +**/ +VOID +VariableNotifySmmWriteReady ( + VOID + ) +{ +} + +EFI_STATUS +EFIAPI +VariableServiceInitialize ( + IN EFI_HANDLE ImageHandle, + IN EFI_MM_SYSTEM_TABLE *MmSystemTable + ) +{ + return MmVariableServiceInitialize (); +} + +/** + Whether the TCG or TCG2 protocols are installed in the UEFI protocol database. + This information is used by the MorLock code to infer whether an existing + MOR variable is legitimate or not. +**/ +BOOLEAN +VariableHaveTcgProtocols ( + VOID + ) +{ + return FALSE; +} diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.inf b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.inf new file mode 100644 index 000000000000..54d647af914c --- /dev/null +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableStandaloneMm.inf @@ -0,0 +1,135 @@ +## @file +# Provides SMM variable service. +# +# This module installs SMM variable protocol into SMM protocol database, +# which can be used by SMM driver, and installs SMM variable protocol +# into BS protocol database, which can be used to notify the SMM Runtime +# Dxe driver that the SMM variable service is ready. +# This module should be used with SMM Runtime DXE module together. The +# SMM Runtime DXE module would install variable arch protocol and variable +# write arch protocol based on SMM variable module. +# +# Caution: This module requires additional review when modified. +# This driver will have external input - variable data and communicate buffer in SMM mode. +# This external input must be validated carefully to avoid security issues such as +# buffer overflow or integer overflow. +# The whole SMM authentication variable design relies on the integrity of flash part and SMM. +# which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory +# may not be modified without authorization. If platform fails to protect these resources, +# the authentication service provided in this driver will be broken, and the behavior is undefined. +# +# Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR> +# This program and the accompanying materials +# are licensed and made available under the terms and conditions of the BSD License +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +## + +[Defines] + INF_VERSION = 0x0001001A + BASE_NAME = VariableStandaloneMm + FILE_GUID = 7ee2c0c1-c21a-4113-a53a-66824a95696f + MODULE_TYPE = MM_STANDALONE + VERSION_STRING = 1.0 + PI_SPECIFICATION_VERSION = 0x00010032 + ENTRY_POINT = VariableServiceInitialize + +# +# The following information is for reference only and not required by the build tools. +# +# VALID_ARCHITECTURES = AARCH64 +# + + +[Sources] + Reclaim.c + Variable.c + VariableSmm.c + VariableStandaloneMm.c + VarCheck.c + Variable.h + PrivilegePolymorphic.h + VariableExLib.c + TcgMorLockSmm.c + SpeculationBarrierSmm.c + +[Packages] + MdePkg/MdePkg.dec + MdeModulePkg/MdeModulePkg.dec + StandaloneMmPkg/StandaloneMmPkg.dec + +[LibraryClasses] + AuthVariableLib + BaseLib + BaseMemoryLib + DebugLib + HobLib + MemoryAllocationLib + MmServicesTableLib + StandaloneMmDriverEntryPoint + SynchronizationLib + VarCheckLib + +[Protocols] + gEfiSmmFirmwareVolumeBlockProtocolGuid ## CONSUMES + ## CONSUMES + ## NOTIFY + gEfiSmmFaultTolerantWriteProtocolGuid + ## PRODUCES + ## UNDEFINED # SmiHandlerRegister + gEfiSmmVariableProtocolGuid + gEfiMmEndOfDxeProtocolGuid ## NOTIFY + gEdkiiSmmVarCheckProtocolGuid ## PRODUCES + +[Guids] + ## SOMETIMES_CONSUMES ## GUID # Signature of Variable store header + ## SOMETIMES_PRODUCES ## GUID # Signature of Variable store header + ## SOMETIMES_CONSUMES ## HOB + ## SOMETIMES_PRODUCES ## SystemTable + gEfiAuthenticatedVariableGuid + + ## SOMETIMES_CONSUMES ## GUID # Signature of Variable store header + ## SOMETIMES_PRODUCES ## GUID # Signature of Variable store header + ## SOMETIMES_CONSUMES ## HOB + ## SOMETIMES_PRODUCES ## SystemTable + gEfiVariableGuid + + ## SOMETIMES_CONSUMES ## Variable:L"PlatformLang" + ## SOMETIMES_PRODUCES ## Variable:L"PlatformLang" + ## SOMETIMES_CONSUMES ## Variable:L"Lang" + ## SOMETIMES_PRODUCES ## Variable:L"Lang" + gEfiGlobalVariableGuid + + gEfiMemoryOverwriteControlDataGuid ## SOMETIMES_CONSUMES ## Variable:L"MemoryOverwriteRequestControl" + gEfiMemoryOverwriteRequestControlLockGuid ## SOMETIMES_PRODUCES ## Variable:L"MemoryOverwriteRequestControlLock" + + gEfiSystemNvDataFvGuid ## CONSUMES ## GUID + gEdkiiFaultTolerantWriteGuid ## SOMETIMES_CONSUMES ## HOB + + ## SOMETIMES_CONSUMES ## Variable:L"VarErrorFlag" + ## SOMETIMES_PRODUCES ## Variable:L"VarErrorFlag" + gEdkiiVarErrorFlagGuid + +[FixedPcd] + gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase ## SOMETIMES_CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64 ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVolatileVariableSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMaxHardwareErrorVariableSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdHwErrStorageSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMaxUserNvVariableSpaceSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdBoottimeReservedNvVariableSpaceSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdReclaimVariableSpaceAtEndOfDxe ## CONSUMES + +[FeaturePcd] + gEfiMdeModulePkgTokenSpaceGuid.PcdVariableCollectStatistics ## CONSUMES # statistic the information of variable. + gEfiMdePkgTokenSpaceGuid.PcdUefiVariableDefaultLangDeprecate ## CONSUMES # Auto update PlatformLang/Lang + +[Depex] + TRUE -- 2.17.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
