9b4a20321e
The variable driver doesn't distinguish "non-volatile non-authenticated" variables from "volatile non-authenticated" variables, when checking individual variable sizes against the permitted maximum. PcdMaxVariableSize covers both kinds. This prevents volatile non-authenticated variables from carrying large data between UEFI drivers, despite having no flash impact. One example is EFI_TLS_CA_CERTIFICATE_VARIABLE, which platforms might want to create as volatile on every boot: the certificate list can be several hundred KB in size. Introduce PcdMaxVolatileVariableSize to represent the limit on individual volatile non-authenticated variables. The default value is zero, which makes Variable/RuntimeDxe fall back to PcdMaxVariableSize (i.e. the current behavior). This is similar to the PcdMaxAuthVariableSize fallback. Whenever the size limit is enforced, consult MaxVolatileVariableSize as the last option, after checking - MaxAuthVariableSize for VARIABLE_ATTRIBUTE_AT_AW, - and MaxVariableSize for EFI_VARIABLE_NON_VOLATILE. EFI_VARIABLE_HARDWARE_ERROR_RECORD is always handled separately; it always takes priority over the three cases listed above. Introduce the GetMaxVariableSize() helper to consider PcdMaxVolatileVariableSize, in addition to GetNonVolatileMaxVariableSize(). GetNonVolatileMaxVariableSize() is currently called at three sites, and two of those need to start using GetMaxVariableSize() instead: - VariableServiceInitialize() [VariableSmm.c]: the SMM comms buffer must accommodate all kinds of variables, - VariableCommonInitialize() [Variable.c]: the preallocated scratch space must also accommodate all kinds of variables, - InitNonVolatileVariableStore() [Variable.c] can continue using GetNonVolatileMaxVariableSize(). Don't modify the ReclaimForOS() function as it is specific to non-volatile variables and should ignore PcdMaxVolatileVariableSize. Cc: Eric Dong <eric.dong@intel.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Gary Lin <glin@suse.com> Tested-by: Gary Lin <glin@suse.com> [lersek@redhat.com: set MaxVolatileVariableSize where Star suggested] Reviewed-by: Star Zeng <star.zeng@intel.com>
143 lines
5.5 KiB
INI
143 lines
5.5 KiB
INI
## @file
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# Provides variable service.
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#
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# This module installs variable arch protocol and variable write arch protocol to provide
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# variable services: SetVariable, GetVariable, GetNextVariableName and QueryVariableInfo.
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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.
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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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#
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# Copyright (c) 2006 - 2017, Intel Corporation. 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 = 0x00010005
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BASE_NAME = VariableRuntimeDxe
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MODULE_UNI_FILE = VariableRuntimeDxe.uni
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FILE_GUID = CBD2E4D5-7068-4FF5-B462-9822B4AD8D60
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MODULE_TYPE = DXE_RUNTIME_DRIVER
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VERSION_STRING = 1.0
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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 EBC
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#
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# VIRTUAL_ADDRESS_MAP_CALLBACK = VariableClassAddressChangeEvent
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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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VariableDxe.c
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Variable.h
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PrivilegePolymorphic.h
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Measurement.c
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TcgMorLockDxe.c
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VarCheck.c
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VariableExLib.c
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[Packages]
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MdePkg/MdePkg.dec
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MdeModulePkg/MdeModulePkg.dec
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[LibraryClasses]
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MemoryAllocationLib
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BaseLib
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SynchronizationLib
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UefiLib
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UefiBootServicesTableLib
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BaseMemoryLib
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DebugLib
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UefiRuntimeLib
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DxeServicesTableLib
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UefiDriverEntryPoint
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PcdLib
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HobLib
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TpmMeasurementLib
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AuthVariableLib
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VarCheckLib
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[Protocols]
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gEfiFirmwareVolumeBlockProtocolGuid ## CONSUMES
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## CONSUMES
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## NOTIFY
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gEfiFaultTolerantWriteProtocolGuid
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gEfiVariableWriteArchProtocolGuid ## PRODUCES
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gEfiVariableArchProtocolGuid ## PRODUCES
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gEdkiiVariableLockProtocolGuid ## PRODUCES
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gEdkiiVarCheckProtocolGuid ## 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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## SOMETIMES_CONSUMES ## Variable:L"PK"
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## SOMETIMES_CONSUMES ## Variable:L"KEK"
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## SOMETIMES_CONSUMES ## Variable:L"SecureBoot"
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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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gEfiEventVirtualAddressChangeGuid ## CONSUMES ## Event
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gEfiSystemNvDataFvGuid ## CONSUMES ## GUID
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gEfiEndOfDxeEventGroupGuid ## CONSUMES ## Event
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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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## SOMETIMES_CONSUMES ## Variable:L"db"
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## SOMETIMES_CONSUMES ## Variable:L"dbx"
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## SOMETIMES_CONSUMES ## Variable:L"dbt"
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gEfiImageSecurityDatabaseGuid
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[Pcd]
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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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[UserExtensions.TianoCore."ExtraFiles"]
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VariableRuntimeDxeExtra.uni
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