Add security package to repository.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12261 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
gdong1
671
SecurityPkg/VariableAuthenticated/Pei/Variable.c
Normal file
671
SecurityPkg/VariableAuthenticated/Pei/Variable.c
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@ -0,0 +1,671 @@
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/** @file
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Implement ReadOnly Variable Services required by PEIM and install PEI
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ReadOnly Varaiable2 PPI. These services operates the non-volatile
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storage space.
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Copyright (c) 2009 - 2011, 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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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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#include "Variable.h"
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//
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// Module globals
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//
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EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariablePpi = {
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PeiGetVariable,
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PeiGetNextVariableName
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};
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EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {
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(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
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&gEfiPeiReadOnlyVariable2PpiGuid,
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&mVariablePpi
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};
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/**
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Provide the functionality of the variable services.
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@param FileHandle Handle of the file being invoked.
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Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
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@param PeiServices General purpose services available to every PEIM.
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@retval EFI_SUCCESS If the interface could be successfully installed
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@retval Others Returned from PeiServicesInstallPpi()
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**/
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EFI_STATUS
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EFIAPI
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PeimInitializeVariableServices (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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EFI_BOOT_MODE BootMode;
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EFI_STATUS Status;
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//
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// Check if this is recovery boot path. If no, publish the variable access capability
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// to other modules. If yes, the content of variable area is not reliable. Therefore,
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// in this case we should not provide variable service to other pei modules.
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//
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Status = (*PeiServices)->GetBootMode (PeiServices, &BootMode);
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ASSERT_EFI_ERROR (Status);
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if (BootMode == BOOT_IN_RECOVERY_MODE) {
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return EFI_UNSUPPORTED;
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}
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return PeiServicesInstallPpi (&mPpiListVariable);
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}
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/**
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Gets the pointer to the first variable header in given variable store area.
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@param VarStoreHeader Pointer to the Variable Store Header.
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@return Pointer to the first variable header
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**/
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VARIABLE_HEADER *
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GetStartPointer (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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)
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{
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//
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// The end of variable store
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//
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return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);
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}
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/**
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This code gets the pointer to the last variable memory pointer byte.
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@param VarStoreHeader Pointer to the Variable Store Header.
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@return VARIABLE_HEADER* pointer to last unavailable Variable Header.
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**/
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VARIABLE_HEADER *
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GetEndPointer (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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)
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{
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//
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// The end of variable store
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//
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return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);
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}
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/**
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This code checks if variable header is valid or not.
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@param Variable Pointer to the Variable Header.
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@retval TRUE Variable header is valid.
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@retval FALSE Variable header is not valid.
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**/
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BOOLEAN
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IsValidVariableHeader (
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IN VARIABLE_HEADER *Variable
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)
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{
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if (Variable == NULL || Variable->StartId != VARIABLE_DATA ) {
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return FALSE;
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}
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return TRUE;
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}
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/**
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This code gets the size of name of variable.
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@param Variable Pointer to the Variable Header.
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@return Size of variable in bytes in type UINTN.
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**/
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UINTN
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NameSizeOfVariable (
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IN VARIABLE_HEADER *Variable
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)
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{
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if (Variable->State == (UINT8) (-1) ||
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Variable->DataSize == (UINT32) (-1) ||
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Variable->NameSize == (UINT32) (-1) ||
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Variable->Attributes == (UINT32) (-1)) {
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return 0;
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}
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return (UINTN) Variable->NameSize;
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}
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/**
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This code gets the size of data of variable.
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@param Variable Pointer to the Variable Header.
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@return Size of variable in bytes in type UINTN.
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**/
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UINTN
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DataSizeOfVariable (
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IN VARIABLE_HEADER *Variable
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)
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{
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if (Variable->State == (UINT8) (-1) ||
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Variable->DataSize == (UINT32) (-1) ||
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Variable->NameSize == (UINT32) (-1) ||
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Variable->Attributes == (UINT32) (-1)) {
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return 0;
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}
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return (UINTN) Variable->DataSize;
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}
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/**
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This code gets the pointer to the variable name.
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@param Variable Pointer to the Variable Header.
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@return A CHAR16* pointer to Variable Name.
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**/
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CHAR16 *
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GetVariableNamePtr (
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IN VARIABLE_HEADER *Variable
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)
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{
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return (CHAR16 *) (Variable + 1);
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}
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/**
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This code gets the pointer to the variable data.
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@param Variable Pointer to the Variable Header.
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@return A UINT8* pointer to Variable Data.
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**/
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UINT8 *
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GetVariableDataPtr (
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IN VARIABLE_HEADER *Variable
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)
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{
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UINTN Value;
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//
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// Be careful about pad size for alignment
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//
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Value = (UINTN) GetVariableNamePtr (Variable);
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Value += NameSizeOfVariable (Variable);
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Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));
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return (UINT8 *) Value;
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}
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/**
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This code gets the pointer to the next variable header.
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@param Variable Pointer to the Variable Header.
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@return A VARIABLE_HEADER* pointer to next variable header.
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**/
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VARIABLE_HEADER *
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GetNextVariablePtr (
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IN VARIABLE_HEADER *Variable
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)
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{
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UINTN Value;
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if (!IsValidVariableHeader (Variable)) {
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return NULL;
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}
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Value = (UINTN) GetVariableDataPtr (Variable);
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Value += DataSizeOfVariable (Variable);
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Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));
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//
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// Be careful about pad size for alignment
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//
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return (VARIABLE_HEADER *) HEADER_ALIGN (Value);
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}
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/**
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This code gets the pointer to the variable name.
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@param VarStoreHeader Pointer to the Variable Store Header.
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@retval EfiRaw Variable store is raw
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@retval EfiValid Variable store is valid
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@retval EfiInvalid Variable store is invalid
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**/
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VARIABLE_STORE_STATUS
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GetVariableStoreStatus (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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)
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{
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if (CompareGuid (&VarStoreHeader->Signature, &gEfiAuthenticatedVariableGuid) &&
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VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
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VarStoreHeader->State == VARIABLE_STORE_HEALTHY
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) {
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return EfiValid;
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}
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if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&
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((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&
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((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&
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((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&
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VarStoreHeader->Size == 0xffffffff &&
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VarStoreHeader->Format == 0xff &&
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VarStoreHeader->State == 0xff
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) {
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return EfiRaw;
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} else {
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return EfiInvalid;
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}
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}
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/**
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This function compares a variable with variable entries in database.
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@param Variable Pointer to the variable in our database
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@param VariableName Name of the variable to compare to 'Variable'
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@param VendorGuid GUID of the variable to compare to 'Variable'
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@param PtrTrack Variable Track Pointer structure that contains Variable Information.
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@retval EFI_SUCCESS Found match variable
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@retval EFI_NOT_FOUND Variable not found
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**/
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EFI_STATUS
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CompareWithValidVariable (
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IN VARIABLE_HEADER *Variable,
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IN CONST CHAR16 *VariableName,
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IN CONST EFI_GUID *VendorGuid,
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OUT VARIABLE_POINTER_TRACK *PtrTrack
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)
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{
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VOID *Point;
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if (VariableName[0] == 0) {
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PtrTrack->CurrPtr = Variable;
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return EFI_SUCCESS;
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} else {
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//
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// Don't use CompareGuid function here for performance reasons.
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// Instead we compare the GUID a UINT32 at a time and branch
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// on the first failed comparison.
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//
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if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&
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(((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&
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(((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&
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(((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])
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) {
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ASSERT (NameSizeOfVariable (Variable) != 0);
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Point = (VOID *) GetVariableNamePtr (Variable);
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if (CompareMem (VariableName, Point, NameSizeOfVariable (Variable)) == 0) {
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PtrTrack->CurrPtr = Variable;
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return EFI_SUCCESS;
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}
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}
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}
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return EFI_NOT_FOUND;
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}
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/**
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This code finds variable in storage blocks (Non-Volatile).
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@param PeiServices General purpose services available to every PEIM.
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@param VariableName Name of the variable to be found
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@param VendorGuid Vendor GUID to be found.
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@param PtrTrack Variable Track Pointer structure that contains Variable Information.
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@retval EFI_SUCCESS Variable found successfully
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@retval EFI_NOT_FOUND Variable not found
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@retval EFI_INVALID_PARAMETER Invalid variable name
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**/
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EFI_STATUS
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FindVariable (
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN CONST CHAR16 *VariableName,
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IN CONST EFI_GUID *VendorGuid,
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OUT VARIABLE_POINTER_TRACK *PtrTrack
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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VARIABLE_STORE_HEADER *VariableStoreHeader;
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VARIABLE_HEADER *Variable;
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VARIABLE_HEADER *LastVariable;
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VARIABLE_HEADER *MaxIndex;
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VARIABLE_INDEX_TABLE *IndexTable;
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UINT32 Count;
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UINT32 Offset;
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UINT8 *VariableBase;
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BOOLEAN StopRecord;
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if (VariableName[0] != 0 && VendorGuid == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// No Variable Address equals zero, so 0 as initial value is safe.
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//
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MaxIndex = 0;
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StopRecord = FALSE;
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GuidHob = GetFirstGuidHob (&gEfiVariableIndexTableGuid);
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if (GuidHob == NULL) {
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//
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// If it's the first time to access variable region in flash, create a guid hob to record
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// VAR_ADDED type variable info.
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// Note that as the resource of PEI phase is limited, only store the number of
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// VARIABLE_INDEX_TABLE_VOLUME of VAR_ADDED type variables to reduce access time.
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//
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IndexTable = BuildGuidHob (&gEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));
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IndexTable->Length = 0;
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IndexTable->StartPtr = NULL;
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IndexTable->EndPtr = NULL;
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IndexTable->GoneThrough = 0;
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} else {
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IndexTable = GET_GUID_HOB_DATA (GuidHob);
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for (Offset = 0, Count = 0; Count < IndexTable->Length; Count++) {
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//
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// traverse the variable info list to look for varible.
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// The IndexTable->Index[Count] records the distance of two neighbouring VAR_ADDED type variables.
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//
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ASSERT (Count < VARIABLE_INDEX_TABLE_VOLUME);
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Offset += IndexTable->Index[Count];
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MaxIndex = (VARIABLE_HEADER *)((CHAR8 *)(IndexTable->StartPtr) + Offset);
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if (CompareWithValidVariable (MaxIndex, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {
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PtrTrack->StartPtr = IndexTable->StartPtr;
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PtrTrack->EndPtr = IndexTable->EndPtr;
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return EFI_SUCCESS;
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}
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}
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if (IndexTable->GoneThrough != 0) {
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return EFI_NOT_FOUND;
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||||
}
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||||
}
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//
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||||
// If not found in HOB, then let's start from the MaxIndex we've found.
|
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//
|
||||
if (MaxIndex != NULL) {
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Variable = GetNextVariablePtr (MaxIndex);
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LastVariable = MaxIndex;
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} else {
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if ((IndexTable->StartPtr != NULL) || (IndexTable->EndPtr != NULL)) {
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Variable = IndexTable->StartPtr;
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} else {
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VariableBase = (UINT8 *) (UINTN) PcdGet64 (PcdFlashNvStorageVariableBase64);
|
||||
if (VariableBase == NULL) {
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VariableBase = (UINT8 *) (UINTN) PcdGet32 (PcdFlashNvStorageVariableBase);
|
||||
}
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||||
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||||
VariableStoreHeader = (VARIABLE_STORE_HEADER *) (VariableBase + \
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((EFI_FIRMWARE_VOLUME_HEADER *) (VariableBase)) -> HeaderLength);
|
||||
|
||||
if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
if (~VariableStoreHeader->Size == 0) {
|
||||
return EFI_NOT_FOUND;
|
||||
}
|
||||
//
|
||||
// Find the variable by walk through non-volatile variable store
|
||||
//
|
||||
IndexTable->StartPtr = GetStartPointer (VariableStoreHeader);
|
||||
IndexTable->EndPtr = GetEndPointer (VariableStoreHeader);
|
||||
|
||||
//
|
||||
// Start Pointers for the variable.
|
||||
// Actual Data Pointer where data can be written.
|
||||
//
|
||||
Variable = IndexTable->StartPtr;
|
||||
}
|
||||
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||||
LastVariable = IndexTable->StartPtr;
|
||||
}
|
||||
//
|
||||
// Find the variable by walk through non-volatile variable store
|
||||
//
|
||||
PtrTrack->StartPtr = IndexTable->StartPtr;
|
||||
PtrTrack->EndPtr = IndexTable->EndPtr;
|
||||
|
||||
while ((Variable < IndexTable->EndPtr) && IsValidVariableHeader (Variable)) {
|
||||
if (Variable->State == VAR_ADDED) {
|
||||
//
|
||||
// Record Variable in VariableIndex HOB
|
||||
//
|
||||
if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME && !StopRecord) {
|
||||
Offset = (UINT32)((UINTN)Variable - (UINTN)LastVariable);
|
||||
//
|
||||
// The distance of two neighbouring VAR_ADDED variable is larger than 2^16,
|
||||
// which is beyond the allowable scope(UINT16) of record. In such case, need not to
|
||||
// record the subsequent VAR_ADDED type variables again.
|
||||
//
|
||||
if ((Offset & 0xFFFF0000UL) != 0) {
|
||||
StopRecord = TRUE;
|
||||
}
|
||||
|
||||
if (!StopRecord) {
|
||||
IndexTable->Index[IndexTable->Length++] = (UINT16) Offset;
|
||||
}
|
||||
LastVariable = Variable;
|
||||
}
|
||||
|
||||
if (CompareWithValidVariable (Variable, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
}
|
||||
|
||||
Variable = GetNextVariablePtr (Variable);
|
||||
}
|
||||
//
|
||||
// If gone through the VariableStore, that means we never find in Firmware any more.
|
||||
//
|
||||
if ((IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) && (!StopRecord)) {
|
||||
IndexTable->GoneThrough = 1;
|
||||
}
|
||||
|
||||
PtrTrack->CurrPtr = NULL;
|
||||
|
||||
return EFI_NOT_FOUND;
|
||||
}
|
||||
|
||||
/**
|
||||
This service retrieves a variable's value using its name and GUID.
|
||||
|
||||
Read the specified variable from the UEFI variable store. If the Data
|
||||
buffer is too small to hold the contents of the variable, the error
|
||||
EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
|
||||
size to obtain the data.
|
||||
|
||||
@param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
|
||||
@param VariableName A pointer to a null-terminated string that is the variable's name.
|
||||
@param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of
|
||||
VariableGuid and VariableName must be unique.
|
||||
@param Attributes If non-NULL, on return, points to the variable's attributes.
|
||||
@param DataSize On entry, points to the size in bytes of the Data buffer.
|
||||
On return, points to the size of the data returned in Data.
|
||||
@param Data Points to the buffer which will hold the returned variable value.
|
||||
|
||||
@retval EFI_SUCCESS The variable was read successfully.
|
||||
@retval EFI_NOT_FOUND The variable could not be found.
|
||||
@retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data.
|
||||
DataSize is updated with the size required for
|
||||
the specified variable.
|
||||
@retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
|
||||
@retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
|
||||
|
||||
**/
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
PeiGetVariable (
|
||||
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
|
||||
IN CONST CHAR16 *VariableName,
|
||||
IN CONST EFI_GUID *VariableGuid,
|
||||
OUT UINT32 *Attributes,
|
||||
IN OUT UINTN *DataSize,
|
||||
OUT VOID *Data
|
||||
)
|
||||
{
|
||||
VARIABLE_POINTER_TRACK Variable;
|
||||
UINTN VarDataSize;
|
||||
EFI_STATUS Status;
|
||||
CONST EFI_PEI_SERVICES **PeiServices;
|
||||
|
||||
PeiServices = GetPeiServicesTablePointer ();
|
||||
if (VariableName == NULL || VariableGuid == NULL || DataSize == NULL) {
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
//
|
||||
// Find existing variable
|
||||
//
|
||||
Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);
|
||||
if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {
|
||||
return Status;
|
||||
}
|
||||
//
|
||||
// Get data size
|
||||
//
|
||||
VarDataSize = DataSizeOfVariable (Variable.CurrPtr);
|
||||
if (*DataSize >= VarDataSize) {
|
||||
if (Data == NULL) {
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
|
||||
CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);
|
||||
|
||||
if (Attributes != NULL) {
|
||||
*Attributes = Variable.CurrPtr->Attributes;
|
||||
}
|
||||
|
||||
*DataSize = VarDataSize;
|
||||
return EFI_SUCCESS;
|
||||
} else {
|
||||
*DataSize = VarDataSize;
|
||||
return EFI_BUFFER_TOO_SMALL;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
Return the next variable name and GUID.
|
||||
|
||||
This function is called multiple times to retrieve the VariableName
|
||||
and VariableGuid of all variables currently available in the system.
|
||||
On each call, the previous results are passed into the interface,
|
||||
and, on return, the interface returns the data for the next
|
||||
interface. When the entire variable list has been returned,
|
||||
EFI_NOT_FOUND is returned.
|
||||
|
||||
@param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
|
||||
|
||||
@param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.
|
||||
On return, the size of the variable name buffer.
|
||||
@param VariableName On entry, a pointer to a null-terminated string that is the variable's name.
|
||||
On return, points to the next variable's null-terminated name string.
|
||||
@param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID.
|
||||
On return, a pointer to the next variable's GUID.
|
||||
|
||||
@retval EFI_SUCCESS The variable was read successfully.
|
||||
@retval EFI_NOT_FOUND The variable could not be found.
|
||||
@retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting
|
||||
data. VariableNameSize is updated with the size
|
||||
required for the specified variable.
|
||||
@retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
|
||||
VariableNameSize is NULL.
|
||||
@retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
|
||||
|
||||
**/
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
PeiGetNextVariableName (
|
||||
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
|
||||
IN OUT UINTN *VariableNameSize,
|
||||
IN OUT CHAR16 *VariableName,
|
||||
IN OUT EFI_GUID *VariableGuid
|
||||
)
|
||||
{
|
||||
VARIABLE_POINTER_TRACK Variable;
|
||||
UINTN VarNameSize;
|
||||
EFI_STATUS Status;
|
||||
CONST EFI_PEI_SERVICES **PeiServices;
|
||||
|
||||
PeiServices = GetPeiServicesTablePointer ();
|
||||
if (VariableName == NULL || VariableGuid == NULL || VariableNameSize == NULL) {
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
|
||||
Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);
|
||||
if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {
|
||||
return Status;
|
||||
}
|
||||
|
||||
if (VariableName[0] != 0) {
|
||||
//
|
||||
// If variable name is not NULL, get next variable
|
||||
//
|
||||
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
|
||||
}
|
||||
|
||||
while (!(Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL)) {
|
||||
if (IsValidVariableHeader (Variable.CurrPtr)) {
|
||||
if (Variable.CurrPtr->State == VAR_ADDED) {
|
||||
ASSERT (NameSizeOfVariable (Variable.CurrPtr) != 0);
|
||||
|
||||
VarNameSize = (UINTN) NameSizeOfVariable (Variable.CurrPtr);
|
||||
if (VarNameSize <= *VariableNameSize) {
|
||||
CopyMem (VariableName, GetVariableNamePtr (Variable.CurrPtr), VarNameSize);
|
||||
|
||||
CopyMem (VariableGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));
|
||||
|
||||
Status = EFI_SUCCESS;
|
||||
} else {
|
||||
Status = EFI_BUFFER_TOO_SMALL;
|
||||
}
|
||||
|
||||
*VariableNameSize = VarNameSize;
|
||||
return Status;
|
||||
//
|
||||
// Variable is found
|
||||
//
|
||||
} else {
|
||||
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
|
||||
}
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return EFI_NOT_FOUND;
|
||||
}
|
||||
Reference in New Issue
Block a user