@@ -48,6 +48,7 @@ [Defines]
[Sources]
Reclaim.c
Variable.c
+ VariableTraditionalMm.c
VariableSmm.c
VarCheck.c
Variable.h
@@ -66,7 +67,7 @@ [LibraryClasses]
BaseLib
SynchronizationLib
UefiLib
- SmmServicesTableLib
+ MmServicesTableLib
BaseMemoryLib
DebugLib
DxeServicesTableLib
@@ -85,7 +86,7 @@ [Protocols]
## PRODUCES
## UNDEFINED # SmiHandlerRegister
gEfiSmmVariableProtocolGuid
- gEfiSmmEndOfDxeProtocolGuid ## NOTIFY
+ gEfiMmEndOfDxeProtocolGuid ## NOTIFY
gEdkiiSmmVarCheckProtocolGuid ## PRODUCES
gEfiTcgProtocolGuid ## SOMETIMES_CONSUMES
gEfiTcg2ProtocolGuid ## SOMETIMES_CONSUMES
@@ -97,4 +97,62 @@ VariableSpeculationBarrier (
VOID
);
+/**
+ 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
+ );
+
+/**
+ Variable service MM driver entry point
+**/
+EFI_STATUS
+EFIAPI
+MmVariableServiceInitialize (
+ VOID
+ );
+
+/**
+ This function checks if the buffer is valid per processor architecture and
+ does not overlap with SMRAM.
+
+ @param Buffer The buffer start address to be checked.
+ @param Length The buffer length to be checked.
+
+ @retval TRUE This buffer is valid per processor architecture and does not
+ overlap with SMRAM.
+ @retval FALSE This buffer is not valid per processor architecture or overlaps
+ with SMRAM.
+**/
+BOOLEAN
+VariableSmmIsBufferOutsideSmmValid (
+ IN EFI_PHYSICAL_ADDRESS Buffer,
+ IN UINT64 Length
+ );
+
+/**
+ 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.
+
+ @retval TRUE Either the TCG or TCG2 protocol is installed in the UEFI
+ protocol database
+ @retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
+ protocol database
+**/
+BOOLEAN
+VariableHaveTcgProtocols (
+ VOID
+ );
+
#endif
@@ -21,7 +21,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
-#include <Library/UefiBootServicesTableLib.h>
#include "Variable.h"
typedef struct {
@@ -419,8 +418,6 @@ MorLockInitAtEndOfDxe (
{
UINTN MorSize;
EFI_STATUS MorStatus;
- EFI_STATUS TcgStatus;
- VOID *TcgInterface;
if (!mMorLockInitializationRequired) {
//
@@ -458,20 +455,7 @@ MorLockInitAtEndOfDxe (
// can be deduced from the absence of the TCG / TCG2 protocols, as edk2's
// MOR implementation depends on (one of) those protocols.
//
- TcgStatus = gBS->LocateProtocol (
- &gEfiTcg2ProtocolGuid,
- NULL, // Registration
- &TcgInterface
- );
- if (EFI_ERROR (TcgStatus)) {
- TcgStatus = gBS->LocateProtocol (
- &gEfiTcgProtocolGuid,
- NULL, // Registration
- &TcgInterface
- );
- }
-
- if (!EFI_ERROR (TcgStatus)) {
+ if (VariableHaveTcgProtocols ()) {
//
// The MOR variable originates from the platform firmware; set the MOR
// Control Lock variable to report the locking capability to the OS.
@@ -15,6 +15,7 @@
SmmVariableGetStatistics() should also do validation based on its own knowledge.
Copyright (c) 2010 - 2016, 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
@@ -28,18 +29,15 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Protocol/SmmVariable.h>
#include <Protocol/SmmFirmwareVolumeBlock.h>
#include <Protocol/SmmFaultTolerantWrite.h>
-#include <Protocol/SmmEndOfDxe.h>
+#include <Protocol/MmEndOfDxe.h>
#include <Protocol/SmmVarCheck.h>
-#include <Library/SmmServicesTableLib.h>
-#include <Library/SmmMemLib.h>
+#include <Library/MmServicesTableLib.h>
#include <Guid/SmmVariableCommon.h>
#include "Variable.h"
extern VARIABLE_INFO_ENTRY *gVariableInfo;
-EFI_HANDLE mSmmVariableHandle = NULL;
-EFI_HANDLE mVariableHandle = NULL;
BOOLEAN mAtRuntime = FALSE;
UINT8 *mVariableBufferPayload = NULL;
UINTN mVariableBufferPayloadSize;
@@ -218,7 +216,7 @@ GetFtwProtocol (
//
// Locate Smm Fault Tolerent Write protocol
//
- Status = gSmst->SmmLocateProtocol (
+ Status = gMmst->MmLocateProtocol (
&gEfiSmmFaultTolerantWriteProtocolGuid,
NULL,
FtwProtocol
@@ -248,7 +246,7 @@ GetFvbByHandle (
//
// To get the SMM FVB protocol interface on the handle
//
- return gSmst->SmmHandleProtocol (
+ return gMmst->MmHandleProtocol (
FvBlockHandle,
&gEfiSmmFirmwareVolumeBlockProtocolGuid,
(VOID **) FvBlock
@@ -287,7 +285,7 @@ GetFvbCountAndBuffer (
BufferSize = 0;
*NumberHandles = 0;
*Buffer = NULL;
- Status = gSmst->SmmLocateHandle (
+ Status = gMmst->MmLocateHandle (
ByProtocol,
&gEfiSmmFirmwareVolumeBlockProtocolGuid,
NULL,
@@ -303,7 +301,7 @@ GetFvbCountAndBuffer (
return EFI_OUT_OF_RESOURCES;
}
- Status = gSmst->SmmLocateHandle (
+ Status = gMmst->MmLocateHandle (
ByProtocol,
&gEfiSmmFirmwareVolumeBlockProtocolGuid,
NULL,
@@ -500,7 +498,7 @@ SmmVariableHandler (
return EFI_SUCCESS;
}
- if (!SmmIsBufferOutsideSmmValid ((UINTN)CommBuffer, TempCommBufferSize)) {
+ if (!VariableSmmIsBufferOutsideSmmValid ((UINTN)CommBuffer, TempCommBufferSize)) {
DEBUG ((EFI_D_ERROR, "SmmVariableHandler: SMM communication buffer in SMRAM or overflow!\n"));
return EFI_SUCCESS;
}
@@ -911,13 +909,7 @@ SmmFtwNotificationEvent (
//
// Notify the variable wrapper driver the variable write service is ready
//
- Status = gBS->InstallProtocolInterface (
- &mSmmVariableHandle,
- &gSmmVariableWriteGuid,
- EFI_NATIVE_INTERFACE,
- NULL
- );
- ASSERT_EFI_ERROR (Status);
+ VariableNotifySmmWriteReady ();
return EFI_SUCCESS;
}
@@ -928,18 +920,11 @@ SmmFtwNotificationEvent (
runtime services in the EFI System Table and installs arch protocols
for variable read and write services being available. It also registers
a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
-
- @param[in] ImageHandle The firmware allocated handle for the EFI image.
- @param[in] SystemTable A pointer to the EFI System Table.
-
- @retval EFI_SUCCESS Variable service successfully initialized.
-
**/
EFI_STATUS
EFIAPI
-VariableServiceInitialize (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
+MmVariableServiceInitialize (
+ VOID
)
{
EFI_STATUS Status;
@@ -957,7 +942,7 @@ VariableServiceInitialize (
// Install the Smm Variable Protocol on a new handle.
//
VariableHandle = NULL;
- Status = gSmst->SmmInstallProtocolInterface (
+ Status = gMmst->MmInstallProtocolInterface (
&VariableHandle,
&gEfiSmmVariableProtocolGuid,
EFI_NATIVE_INTERFACE,
@@ -965,7 +950,7 @@ VariableServiceInitialize (
);
ASSERT_EFI_ERROR (Status);
- Status = gSmst->SmmInstallProtocolInterface (
+ Status = gMmst->MmInstallProtocolInterface (
&VariableHandle,
&gEdkiiSmmVarCheckProtocolGuid,
EFI_NATIVE_INTERFACE,
@@ -976,7 +961,7 @@ VariableServiceInitialize (
mVariableBufferPayloadSize = GetMaxVariableSize () +
OFFSET_OF (SMM_VARIABLE_COMMUNICATE_VAR_CHECK_VARIABLE_PROPERTY, Name) - GetVariableHeaderSize ();
- Status = gSmst->SmmAllocatePool (
+ Status = gMmst->MmAllocatePool (
EfiRuntimeServicesData,
mVariableBufferPayloadSize,
(VOID **)&mVariableBufferPayload
@@ -987,25 +972,19 @@ VariableServiceInitialize (
/// Register SMM variable SMI handler
///
VariableHandle = NULL;
- Status = gSmst->SmiHandlerRegister (SmmVariableHandler, &gEfiSmmVariableProtocolGuid, &VariableHandle);
+ Status = gMmst->MmiHandlerRegister (SmmVariableHandler, &gEfiSmmVariableProtocolGuid, &VariableHandle);
ASSERT_EFI_ERROR (Status);
//
// Notify the variable wrapper driver the variable service is ready
//
- Status = SystemTable->BootServices->InstallProtocolInterface (
- &mVariableHandle,
- &gEfiSmmVariableProtocolGuid,
- EFI_NATIVE_INTERFACE,
- &gSmmVariable
- );
- ASSERT_EFI_ERROR (Status);
+ VariableNotifySmmReady ();
//
// Register EFI_SMM_END_OF_DXE_PROTOCOL_GUID notify function.
//
- Status = gSmst->SmmRegisterProtocolNotify (
- &gEfiSmmEndOfDxeProtocolGuid,
+ Status = gMmst->MmRegisterProtocolNotify (
+ &gEfiMmEndOfDxeProtocolGuid,
SmmEndOfDxeCallback,
&SmmEndOfDxeRegistration
);
@@ -1014,7 +993,7 @@ VariableServiceInitialize (
//
// Register FtwNotificationEvent () notify function.
//
- Status = gSmst->SmmRegisterProtocolNotify (
+ Status = gMmst->MmRegisterProtocolNotify (
&gEfiSmmFaultTolerantWriteProtocolGuid,
SmmFtwNotificationEvent,
&SmmFtwRegistration
new file mode 100644
@@ -0,0 +1,130 @@
+/** @file
+
+ Parts of the SMM/MM implementation that are specific to traditional 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 <Library/UefiBootServicesTableLib.h>
+#include <Library/SmmMemLib.h>
+#include "Variable.h"
+
+/**
+ This function checks if the buffer is valid per processor architecture and
+ does not overlap with SMRAM.
+
+ @param Buffer The buffer start address to be checked.
+ @param Length The buffer length to be checked.
+
+ @retval TRUE This buffer is valid per processor architecture and does not
+ overlap with SMRAM.
+ @retval FALSE This buffer is not valid per processor architecture or overlaps
+ with SMRAM.
+**/
+BOOLEAN
+VariableSmmIsBufferOutsideSmmValid (
+ IN EFI_PHYSICAL_ADDRESS Buffer,
+ IN UINT64 Length
+ )
+{
+ return SmmIsBufferOutsideSmmValid (Buffer, Length);
+}
+
+/**
+ Notify the system that the SMM variable driver is ready
+**/
+VOID
+VariableNotifySmmReady (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE Handle;
+
+ Handle = NULL;
+ Status = gBS->InstallProtocolInterface (
+ &Handle,
+ &gEfiSmmVariableProtocolGuid,
+ EFI_NATIVE_INTERFACE,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Notify the system that the SMM variable write driver is ready
+**/
+VOID
+VariableNotifySmmWriteReady (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE Handle;
+
+ Handle = NULL;
+ Status = gBS->InstallProtocolInterface (
+ &Handle,
+ &gSmmVariableWriteGuid,
+ EFI_NATIVE_INTERFACE,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Variable service MM driver entry point
+**/
+EFI_STATUS
+EFIAPI
+VariableServiceInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ 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.
+
+ @retval TRUE Either the TCG or TCG2 protocol is installed in the UEFI
+ protocol database
+ @retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
+ protocol database
+**/
+BOOLEAN
+VariableHaveTcgProtocols (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ VOID *Interface;
+
+ Status = gBS->LocateProtocol (
+ &gEfiTcg2ProtocolGuid,
+ NULL, // Registration
+ &Interface
+ );
+ if (!EFI_ERROR (Status)) {
+ return TRUE;
+ }
+
+ Status = gBS->LocateProtocol (
+ &gEfiTcgProtocolGuid,
+ NULL, // Registration
+ &Interface
+ );
+ return !EFI_ERROR (Status);
+}
In preparation of providing a standalone MM based variable runtime driver, move the existing SMM driver to the new MM services table, and factor out some pieces that are specific to the traditional driver, mainly related to the use of UEFI boot services, which are not accessible to standalone MM drivers. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Regression-tested-by: Laszlo Ersek <lersek@redhat.com> --- MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf | 5 +- MdeModulePkg/Universal/Variable/RuntimeDxe/PrivilegePolymorphic.h | 58 +++++++++ MdeModulePkg/Universal/Variable/RuntimeDxe/TcgMorLockSmm.c | 18 +-- MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c | 59 +++------ MdeModulePkg/Universal/Variable/RuntimeDxe/VariableTraditionalMm.c | 130 ++++++++++++++++++++ 5 files changed, 211 insertions(+), 59 deletions(-) -- 2.20.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel