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Add the EDKII_VARIABLE_LOCK_PROTOCOL implementation in SecurityPkg variable drivers.

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Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14378 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
niruiyu
2013-05-20 07:10:10 +00:00
parent 51547bb879
commit 6ab9f44138
8 changed files with 356 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
View File

@@ -29,6 +29,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#include <Protocol/Variable.h>
#include <Protocol/SmmCommunication.h>
#include <Protocol/SmmVariable.h>
#include <Protocol/VariableLock.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
@@ -54,6 +55,7 @@ UINT8 *mVariableBufferPhysical = NULL;
UINTN mVariableBufferSize;
UINTN mVariableBufferPayloadSize;
EFI_LOCK mVariableServicesLock;
EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock;
/**
Acquires lock only at boot time. Simply returns at runtime.
@@ -173,6 +175,73 @@ SendCommunicateBuffer (
return SmmVariableFunctionHeader->ReturnStatus;
}
/**
Mark a variable that will become read-only after leaving the DXE phase of execution.
@param[in] This The VARIABLE_LOCK_PROTOCOL instance.
@param[in] VariableName A pointer to the variable name that will be made read-only subsequently.
@param[in] VendorGuid A pointer to the vendor GUID that will be made read-only subsequently.
@retval EFI_SUCCESS The variable specified by the VariableName and the VendorGuid was marked
as pending to be read-only.
@retval EFI_INVALID_PARAMETER VariableName or VendorGuid is NULL.
Or VariableName is an empty string.
@retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has
already been signaled.
@retval EFI_OUT_OF_RESOURCES There is not enough resource to hold the lock request.
**/
EFI_STATUS
EFIAPI
VariableLockRequestToLock (
IN CONST EDKII_VARIABLE_LOCK_PROTOCOL *This,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid
)
{
EFI_STATUS Status;
UINTN VariableNameSize;
UINTN PayloadSize;
SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *VariableToLock;
if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
VariableNameSize = StrSize (VariableName);
//
// If VariableName exceeds SMM payload limit. Return failure
//
if (VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name)) {
return EFI_INVALID_PARAMETER;
}
AcquireLockOnlyAtBootTime(&mVariableServicesLock);
//
// Init the communicate buffer. The buffer data size is:
// SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.
//
PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name) + VariableNameSize;
Status = InitCommunicateBuffer ((VOID **) &VariableToLock, PayloadSize, SMM_VARIABLE_FUNCTION_LOCK_VARIABLE);
if (EFI_ERROR (Status)) {
goto Done;
}
ASSERT (VariableToLock != NULL);
CopyGuid (&VariableToLock->Guid, VendorGuid);
VariableToLock->NameSize = VariableNameSize;
CopyMem (VariableToLock->Name, VariableName, VariableToLock->NameSize);
//
// Send data to SMM.
//
Status = SendCommunicateBuffer (PayloadSize);
Done:
ReleaseLockOnlyAtBootTime (&mVariableServicesLock);
return Status;
}
/**
This code finds variable in storage blocks (Volatile or Non-Volatile).
@@ -740,6 +809,7 @@ VariableSmmRuntimeInitialize (
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
VOID *SmmVariableRegistration;
VOID *SmmVariableWriteRegistration;
EFI_EVENT OnReadyToBootEvent;
@@ -747,6 +817,15 @@ VariableSmmRuntimeInitialize (
EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);
mVariableLock.RequestToLock = VariableLockRequestToLock;
Status = gBS->InstallMultipleProtocolInterfaces (
&mHandle,
&gEdkiiVariableLockProtocolGuid,
&mVariableLock,
NULL
);
ASSERT_EFI_ERROR (Status);
//
// Smm variable service is ready
//