91f51fcc84
This patch adds more check in SmmIsBufferOutsideSmmValid(), to make sure that SMM communication buffer is only EfiReservedMemoryType/EfiRuntimeServicesCode/ EfiRuntimeServicesData/EfiACPIMemoryNVS. So that the communication buffer will not touch any OS memory. The assumption is that a platform reports valid SMM communication buffer at EndOfDxe, because EndOfDxe is last hook point that SMM code can call-out to get memory map information. A platform MUST finish SMM communication buffer allocation before EndOfDxe. If a DXE or OS driver need do communication after EndOfDxe, it can either allocate SMM communication buffer before EndOfDxe and save it, or consume EDKII_PI_SMM_COMMUNICATION_REGION_TABLE table to get general fixed comm buffer. This is designed to meet Microsoft WSMT table definition on FIXED_COMM_BUFFERS requirement. Cc: Liming Gao <liming.gao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
58 lines
1.9 KiB
INI
58 lines
1.9 KiB
INI
## @file
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# Instance of SMM memory check library.
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#
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# SMM memory check library library implementation. This library consumes SMM_ACCESS2_PROTOCOL
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# to get SMRAM information. In order to use this library instance, the platform should produce
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# all SMRAM range via SMM_ACCESS2_PROTOCOL, including the range for firmware (like SMM Core
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# and SMM driver) and/or specific dedicated hardware.
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#
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# Copyright (c) 2015 - 2016, 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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#
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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 = SmmMemLib
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MODULE_UNI_FILE = SmmMemLib.uni
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FILE_GUID = 7F23F839-C81C-4B89-8132-69746FCBCE52
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MODULE_TYPE = DXE_SMM_DRIVER
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VERSION_STRING = 1.0
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LIBRARY_CLASS = SmmMemLib|DXE_SMM_DRIVER SMM_CORE
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CONSTRUCTOR = SmmMemLibConstructor
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DESTRUCTOR = SmmMemLibDestructor
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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
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#
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[Sources]
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SmmMemLib.c
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[Packages]
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MdePkg/MdePkg.dec
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[LibraryClasses]
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SmmServicesTableLib
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UefiBootServicesTableLib
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DebugLib
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BaseMemoryLib
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HobLib
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MemoryAllocationLib
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[Protocols]
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gEfiSmmAccess2ProtocolGuid ## CONSUMES
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gEfiSmmReadyToLockProtocolGuid ## CONSUMES
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gEfiSmmEndOfDxeProtocolGuid ## CONSUMES
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[Depex]
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gEfiSmmAccess2ProtocolGuid
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