and volatile storage space and install variable architecture protocol\r
based on SMM variable module.\r
\r
-Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials \r
are licensed and made available under the terms and conditions of the BSD License \r
which accompanies this distribution. The full text of the license may be found at \r
#include <Protocol/Variable.h>\r
#include <Protocol/SmmCommunication.h>\r
#include <Protocol/SmmVariable.h>\r
+#include <Protocol/VariableLock.h>\r
\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
UINT8 *mVariableBuffer = NULL;\r
UINT8 *mVariableBufferPhysical = NULL;\r
UINTN mVariableBufferSize;\r
+UINTN mVariableBufferPayloadSize;\r
+EFI_LOCK mVariableServicesLock;\r
+EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock;\r
\r
+/**\r
+ Acquires lock only at boot time. Simply returns at runtime.\r
+\r
+ This is a temperary function that will be removed when\r
+ EfiAcquireLock() in UefiLib can handle the call in UEFI\r
+ Runtimer driver in RT phase.\r
+ It calls EfiAcquireLock() at boot time, and simply returns\r
+ at runtime.\r
+\r
+ @param Lock A pointer to the lock to acquire.\r
+\r
+**/\r
+VOID\r
+AcquireLockOnlyAtBootTime (\r
+ IN EFI_LOCK *Lock\r
+ )\r
+{\r
+ if (!EfiAtRuntime ()) {\r
+ EfiAcquireLock (Lock);\r
+ }\r
+}\r
+\r
+/**\r
+ Releases lock only at boot time. Simply returns at runtime.\r
+\r
+ This is a temperary function which will be removed when\r
+ EfiReleaseLock() in UefiLib can handle the call in UEFI\r
+ Runtimer driver in RT phase.\r
+ It calls EfiReleaseLock() at boot time and simply returns\r
+ at runtime.\r
+\r
+ @param Lock A pointer to the lock to release.\r
+\r
+**/\r
+VOID\r
+ReleaseLockOnlyAtBootTime (\r
+ IN EFI_LOCK *Lock\r
+ )\r
+{\r
+ if (!EfiAtRuntime ()) {\r
+ EfiReleaseLock (Lock);\r
+ }\r
+}\r
\r
/**\r
Initialize the communicate buffer using DataSize and Function.\r
return SmmVariableFunctionHeader->ReturnStatus;\r
}\r
\r
+/**\r
+ Mark a variable that will become read-only after leaving the DXE phase of execution.\r
+\r
+ @param[in] This The VARIABLE_LOCK_PROTOCOL instance.\r
+ @param[in] VariableName A pointer to the variable name that will be made read-only subsequently.\r
+ @param[in] VendorGuid A pointer to the vendor GUID that will be made read-only subsequently.\r
+\r
+ @retval EFI_SUCCESS The variable specified by the VariableName and the VendorGuid was marked\r
+ as pending to be read-only.\r
+ @retval EFI_INVALID_PARAMETER VariableName or VendorGuid is NULL.\r
+ Or VariableName is an empty string.\r
+ @retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has\r
+ already been signaled.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough resource to hold the lock request.\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableLockRequestToLock (\r
+ IN CONST EDKII_VARIABLE_LOCK_PROTOCOL *This,\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINTN VariableNameSize;\r
+ UINTN PayloadSize;\r
+ SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *VariableToLock;\r
+\r
+ if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ VariableNameSize = StrSize (VariableName);\r
+ VariableToLock = NULL;\r
+\r
+ //\r
+ // If VariableName exceeds SMM payload limit. Return failure\r
+ //\r
+ if (VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name)) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+\r
+ //\r
+ // Init the communicate buffer. The buffer data size is:\r
+ // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r
+ //\r
+ PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name) + VariableNameSize;\r
+ Status = InitCommunicateBuffer ((VOID **) &VariableToLock, PayloadSize, SMM_VARIABLE_FUNCTION_LOCK_VARIABLE);\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+ ASSERT (VariableToLock != NULL);\r
+\r
+ CopyGuid (&VariableToLock->Guid, VendorGuid);\r
+ VariableToLock->NameSize = VariableNameSize;\r
+ CopyMem (VariableToLock->Name, VariableName, VariableToLock->NameSize);\r
+\r
+ //\r
+ // Send data to SMM.\r
+ //\r
+ Status = SendCommunicateBuffer (PayloadSize);\r
+\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
+ return Status;\r
+}\r
\r
/**\r
This code finds variable in storage blocks (Volatile or Non-Volatile).\r
EFI_STATUS Status;\r
UINTN PayloadSize;\r
SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r
+ UINTN TempDataSize;\r
+ UINTN VariableNameSize;\r
\r
if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {\r
return EFI_INVALID_PARAMETER;\r
if ((*DataSize != 0) && (Data == NULL)) {\r
return EFI_INVALID_PARAMETER;\r
}\r
- \r
+\r
+ TempDataSize = *DataSize;\r
+ VariableNameSize = StrSize (VariableName);\r
+ SmmVariableHeader = NULL;\r
+\r
+ //\r
+ // If VariableName exceeds SMM payload limit. Return failure\r
+ //\r
+ if (VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+\r
//\r
// Init the communicate buffer. The buffer data size is:\r
// SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r
//\r
- PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName);\r
+ if (TempDataSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize) {\r
+ //\r
+ // If output data buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r
+ //\r
+ TempDataSize = mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize;\r
+ }\r
+ PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + VariableNameSize + TempDataSize;\r
+\r
Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_GET_VARIABLE);\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
ASSERT (SmmVariableHeader != NULL);\r
\r
CopyGuid (&SmmVariableHeader->Guid, VendorGuid);\r
- SmmVariableHeader->DataSize = *DataSize;\r
- SmmVariableHeader->NameSize = StrSize (VariableName);\r
+ SmmVariableHeader->DataSize = TempDataSize;\r
+ SmmVariableHeader->NameSize = VariableNameSize;\r
if (Attributes == NULL) {\r
SmmVariableHeader->Attributes = 0;\r
} else {\r
//\r
// Get data from SMM.\r
//\r
- *DataSize = SmmVariableHeader->DataSize;\r
+ if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {\r
+ //\r
+ // SMM CommBuffer DataSize can be a trimed value\r
+ // Only update DataSize when needed\r
+ //\r
+ *DataSize = SmmVariableHeader->DataSize;\r
+ }\r
if (Attributes != NULL) {\r
*Attributes = SmmVariableHeader->Attributes;\r
}\r
\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
\r
CopyMem (Data, (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize, SmmVariableHeader->DataSize);\r
\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
return Status;\r
}\r
\r
EFI_STATUS Status;\r
UINTN PayloadSize;\r
SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *SmmGetNextVariableName;\r
+ UINTN OutVariableNameSize;\r
+ UINTN InVariableNameSize;\r
\r
if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {\r
return EFI_INVALID_PARAMETER;\r
}\r
- \r
+\r
+ OutVariableNameSize = *VariableNameSize;\r
+ InVariableNameSize = StrSize (VariableName);\r
+ SmmGetNextVariableName = NULL;\r
+\r
+ //\r
+ // If input string exceeds SMM payload limit. Return failure\r
+ //\r
+ if (InVariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+\r
//\r
// Init the communicate buffer. The buffer data size is:\r
// SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r
//\r
- PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + *VariableNameSize; \r
+ if (OutVariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r
+ //\r
+ // If output buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r
+ //\r
+ OutVariableNameSize = mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name);\r
+ }\r
+ //\r
+ // Payload should be Guid + NameSize + MAX of Input & Output buffer\r
+ //\r
+ PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + MAX (OutVariableNameSize, InVariableNameSize);\r
+\r
+\r
Status = InitCommunicateBuffer ((VOID **)&SmmGetNextVariableName, PayloadSize, SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME);\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
ASSERT (SmmGetNextVariableName != NULL);\r
\r
- SmmGetNextVariableName->NameSize = *VariableNameSize;\r
+ //\r
+ // SMM comm buffer->NameSize is buffer size for return string\r
+ //\r
+ SmmGetNextVariableName->NameSize = OutVariableNameSize;\r
+\r
CopyGuid (&SmmGetNextVariableName->Guid, VendorGuid);\r
- CopyMem (SmmGetNextVariableName->Name, VariableName, *VariableNameSize);\r
+ //\r
+ // Copy whole string\r
+ //\r
+ CopyMem (SmmGetNextVariableName->Name, VariableName, InVariableNameSize);\r
+ if (OutVariableNameSize > InVariableNameSize) {\r
+ ZeroMem ((UINT8 *) SmmGetNextVariableName->Name + InVariableNameSize, OutVariableNameSize - InVariableNameSize);\r
+ }\r
\r
//\r
// Send data to SMM\r
//\r
// Get data from SMM.\r
//\r
- *VariableNameSize = SmmGetNextVariableName->NameSize; \r
+ if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {\r
+ //\r
+ // SMM CommBuffer NameSize can be a trimed value\r
+ // Only update VariableNameSize when needed\r
+ //\r
+ *VariableNameSize = SmmGetNextVariableName->NameSize;\r
+ }\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
\r
CopyGuid (VendorGuid, &SmmGetNextVariableName->Guid);\r
CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize); \r
\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
return Status;\r
}\r
\r
EFI_STATUS Status;\r
UINTN PayloadSize; \r
SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r
+ UINTN VariableNameSize;\r
\r
//\r
// Check input parameters.\r
if (DataSize != 0 && Data == NULL) {\r
return EFI_INVALID_PARAMETER;\r
}\r
- \r
+\r
+ VariableNameSize = StrSize (VariableName);\r
+ SmmVariableHeader = NULL;\r
+\r
+ //\r
+ // If VariableName or DataSize exceeds SMM payload limit. Return failure\r
+ //\r
+ if ((VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) ||\r
+ (DataSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize)){\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+ \r
//\r
// Init the communicate buffer. The buffer data size is:\r
// SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r
//\r
- PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + DataSize;\r
+ PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + VariableNameSize + DataSize;\r
Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_SET_VARIABLE);\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
ASSERT (SmmVariableHeader != NULL);\r
\r
CopyGuid ((EFI_GUID *) &SmmVariableHeader->Guid, VendorGuid);\r
SmmVariableHeader->DataSize = DataSize;\r
- SmmVariableHeader->NameSize = StrSize (VariableName);\r
+ SmmVariableHeader->NameSize = VariableNameSize;\r
SmmVariableHeader->Attributes = Attributes;\r
CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r
CopyMem ((UINT8 *) SmmVariableHeader->Name + SmmVariableHeader->NameSize, Data, DataSize);\r
// Send data to SMM.\r
//\r
Status = SendCommunicateBuffer (PayloadSize);\r
- \r
+\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
return Status;\r
}\r
\r
UINTN PayloadSize;\r
SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *SmmQueryVariableInfo;\r
\r
+ SmmQueryVariableInfo = NULL;\r
+\r
if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {\r
return EFI_INVALID_PARAMETER;\r
}\r
- \r
+\r
+ AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r
+\r
//\r
// Init the communicate buffer. The buffer data size is:\r
// SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize;\r
PayloadSize = sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);\r
Status = InitCommunicateBuffer ((VOID **)&SmmQueryVariableInfo, PayloadSize, SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO);\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
ASSERT (SmmQueryVariableInfo != NULL);\r
\r
//\r
Status = SendCommunicateBuffer (PayloadSize);\r
if (EFI_ERROR (Status)) {\r
- return Status;\r
+ goto Done;\r
}\r
\r
//\r
*MaximumVariableSize = SmmQueryVariableInfo->MaximumVariableSize;\r
*MaximumVariableStorageSize = SmmQueryVariableInfo->MaximumVariableStorageSize;\r
*RemainingVariableStorageSize = SmmQueryVariableInfo->RemainingVariableStorageSize; \r
- \r
- return EFI_SUCCESS;\r
+\r
+Done:\r
+ ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r
+ return Status;\r
}\r
\r
\r
ASSERT_EFI_ERROR (Status);\r
\r
//\r
- // Allocate memory for variable store.\r
+ // Allocate memory for variable communicate buffer.\r
//\r
- mVariableBufferSize = SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r
- mVariableBufferSize += MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));\r
+ mVariableBufferPayloadSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize)) +\r
+ OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - sizeof (VARIABLE_HEADER);\r
+ mVariableBufferSize = SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + mVariableBufferPayloadSize;\r
mVariableBuffer = AllocateRuntimePool (mVariableBufferSize);\r
ASSERT (mVariableBuffer != NULL);\r
\r
IN EFI_SYSTEM_TABLE *SystemTable\r
)\r
{\r
+ EFI_STATUS Status;\r
VOID *SmmVariableRegistration;\r
VOID *SmmVariableWriteRegistration;\r
EFI_EVENT OnReadyToBootEvent;\r
EFI_EVENT ExitBootServiceEvent;\r
- \r
+\r
+ EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r
+\r
+ mVariableLock.RequestToLock = VariableLockRequestToLock;\r
+ Status = gBS->InstallMultipleProtocolInterfaces (\r
+ &mHandle,\r
+ &gEdkiiVariableLockProtocolGuid,\r
+ &mVariableLock,\r
+ NULL\r
+ );\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
//\r
// Smm variable service is ready\r
//\r
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