This is a rogue SMM driver. It runs in SMM mode and has access to confidential SMM data. It saves the address of the SMST for the next patch, in runtime storage pointed-to by the PCD added in the previous patch, and exits.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <ler...@redhat.com> --- OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf | 51 +++++++++++++++++++++++++++++ OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.c | 38 +++++++++++++++++++++ OvmfPkg/OvmfPkgX64.dsc | 2 ++ OvmfPkg/OvmfPkgX64.fdf | 1 + 4 files changed, 92 insertions(+) create mode 100644 OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf create mode 100644 OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.c diff --git a/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf b/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf new file mode 100644 index 0000000..5ff895d --- /dev/null +++ b/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf @@ -0,0 +1,51 @@ +## @file +# An SMM driver that publishes the address of the SMST. +# +# Copyright (C) 2013, Red Hat, Inc. +# +# 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 = 0x00010005 + BASE_NAME = DiscloseSmstSmm + FILE_GUID = 2AD83D53-687B-4C3A-8840-EE71164195EB + MODULE_TYPE = DXE_SMM_DRIVER + VERSION_STRING = 1.0 + PI_SPECIFICATION_VERSION = 0x0001000A + ENTRY_POINT = DiscloseSmstSmmEntryPoint + +# +# The following information is for reference only and not required by the build tools. +# +# VALID_ARCHITECTURES = IA32 X64 +# + +[Sources] + DiscloseSmstSmm.c + +[Packages] + MdePkg/MdePkg.dec + OvmfPkg/OvmfPkg.dec + +[LibraryClasses] + DebugLib + PcdLib + SmmServicesTableLib + UefiDriverEntryPoint + +[Pcd] + gUefiOvmfPkgTokenSpaceGuid.PcdDiscloseSmstPtrPtr + +[Guids] + +[Protocols] + +[Depex] + TRUE diff --git a/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.c b/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.c new file mode 100644 index 0000000..152ff98 --- /dev/null +++ b/OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.c @@ -0,0 +1,38 @@ +/** @file + An SMM driver that publishes the address of the SMST. + + Copyright (C) 2013, Red Hat, Inc. + + 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 <Library/DebugLib.h> +#include <Library/PcdLib.h> +#include <Library/SmmServicesTableLib.h> + +EFI_STATUS +EFIAPI +DiscloseSmstSmmEntryPoint ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + UINT64 *DiscloseSmstPtrPtr; + + DiscloseSmstPtrPtr = (UINT64 *)(UINTN) PcdGet64 (PcdDiscloseSmstPtrPtr); + ASSERT (DiscloseSmstPtrPtr != NULL); + + *DiscloseSmstPtrPtr = (UINT64)(UINTN) gSmst; + + // + // No need to keep this in memory after setting the PCD. + // + return EFI_ABORTED; +} diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc index f9ea4c7..d12faee 100644 --- a/OvmfPkg/OvmfPkgX64.dsc +++ b/OvmfPkg/OvmfPkgX64.dsc @@ -278,10 +278,11 @@ DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf !else DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf !endif LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf + PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf ################################################################################ # # Pcd Section - list of all EDK II PCD Entries defined by this Platform. # @@ -517,10 +518,11 @@ # OvmfPkg/EmuSmmDxe/EmuSmmDxe.inf MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf + OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf # # ACPI Support # MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTableDxe.inf diff --git a/OvmfPkg/OvmfPkgX64.fdf b/OvmfPkg/OvmfPkgX64.fdf index 9e2da17..f7b903a 100644 --- a/OvmfPkg/OvmfPkgX64.fdf +++ b/OvmfPkg/OvmfPkgX64.fdf @@ -365,10 +365,11 @@ INF OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf INF OvmfPkg/EmuSmmDxe/EmuSmmDxe.inf INF MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf INF MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf INF MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf +INF OvmfPkg/DiscloseSmstSmm/DiscloseSmstSmm.inf INF MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTableDxe.inf INF OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf INF RuleOverride=ACPITABLE OvmfPkg/AcpiTables/AcpiTables.inf INF OvmfPkg/AcpiS3SaveDxe/AcpiS3SaveDxe.inf -- 1.8.3.1 ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. 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