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system76-edk2/MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLibNullClass.c
Michael D Kinney 9d510e61fc MdeModulePkg: Replace BSD License with BSD+Patent License 
https://bugzilla.tianocore.org/show_bug.cgi?id=1373

Replace BSD 2-Clause License with BSD+Patent License.  This change is
based on the following emails:

  https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html
  https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html

RFCs with detailed process for the license change:

  V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html
  V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html
  V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2019-04-09 10:58:08 -07:00

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/** @file
Implementation functions and structures for var check uefi library.
Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi/UefiBaseType.h>
#include <Library/VarCheckLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Guid/VariableFormat.h>
#include <Guid/GlobalVariable.h>
#include <Guid/HardwareErrorVariable.h>
#include <Guid/ImageAuthentication.h>
typedef
EFI_STATUS
(EFIAPI *INTERNAL_VAR_CHECK_FUNCTION) (
IN VAR_CHECK_VARIABLE_PROPERTY *Propery,
IN UINTN DataSize,
IN VOID *Data
);
typedef struct {
CHAR16 *Name;
VAR_CHECK_VARIABLE_PROPERTY VariableProperty;
INTERNAL_VAR_CHECK_FUNCTION CheckFunction;
} UEFI_DEFINED_VARIABLE_ENTRY;
/**
Internal check for load option.
@param[in] VariablePropery Pointer to variable property.
@param[in] DataSize Data size.
@param[in] Data Pointer to data buffer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER The data buffer is not a valid load option.
**/
EFI_STATUS
EFIAPI
InternalVarCheckLoadOption (
IN VAR_CHECK_VARIABLE_PROPERTY *VariablePropery,
IN UINTN DataSize,
IN VOID *Data
)
{
UINT16 FilePathListLength;
CHAR16 *Description;
EFI_DEVICE_PATH_PROTOCOL *FilePathList;
FilePathListLength = *((UINT16 *) ((UINTN) Data + sizeof (UINT32)));
//
// Check Description
//
Description = (CHAR16 *) ((UINTN) Data + sizeof (UINT32) + sizeof (UINT16));
while (Description < (CHAR16 *) ((UINTN) Data + DataSize)) {
if (*Description == L'\0') {
break;
}
Description++;
}
if ((UINTN) Description >= ((UINTN) Data + DataSize)) {
return EFI_INVALID_PARAMETER;
}
Description++;
//
// Check FilePathList
//
FilePathList = (EFI_DEVICE_PATH_PROTOCOL *) Description;
if ((UINTN) FilePathList > (MAX_ADDRESS - FilePathListLength)) {
return EFI_INVALID_PARAMETER;
}
if (((UINTN) FilePathList + FilePathListLength) > ((UINTN) Data + DataSize)) {
return EFI_INVALID_PARAMETER;
}
if (FilePathListLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
return EFI_INVALID_PARAMETER;
}
if (!IsDevicePathValid (FilePathList, FilePathListLength)) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
Internal check for key option.
@param[in] VariablePropery Pointer to variable property.
@param[in] DataSize Data size.
@param[in] Data Pointer to data buffer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER The data buffer is not a valid key option.
**/
EFI_STATUS
EFIAPI
InternalVarCheckKeyOption (
IN VAR_CHECK_VARIABLE_PROPERTY *VariablePropery,
IN UINTN DataSize,
IN VOID *Data
)
{
if (((DataSize - sizeof (EFI_KEY_OPTION)) % sizeof (EFI_INPUT_KEY)) != 0) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
Internal check for device path.
@param[in] VariablePropery Pointer to variable property.
@param[in] DataSize Data size.
@param[in] Data Pointer to data buffer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER The data buffer is not a valid device path.
**/
EFI_STATUS
EFIAPI
InternalVarCheckDevicePath (
IN VAR_CHECK_VARIABLE_PROPERTY *VariablePropery,
IN UINTN DataSize,
IN VOID *Data
)
{
if (!IsDevicePathValid ((EFI_DEVICE_PATH_PROTOCOL *) Data, DataSize)) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
/**
Internal check for ASCII string.
@param[in] VariablePropery Pointer to variable property.
@param[in] DataSize Data size.
@param[in] Data Pointer to data buffer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER The data buffer is not a Null-terminated ASCII string.
**/
EFI_STATUS
EFIAPI
InternalVarCheckAsciiString (
IN VAR_CHECK_VARIABLE_PROPERTY *VariablePropery,
IN UINTN DataSize,
IN VOID *Data
)
{
CHAR8 *String;
UINTN Index;
String = (CHAR8 *) Data;
if (String[DataSize - 1] == '\0') {
return EFI_SUCCESS;
} else {
for (Index = 1; Index < DataSize && (String[DataSize - 1 - Index] != '\0'); Index++);
if (Index == DataSize) {
return EFI_INVALID_PARAMETER;
}
}
return EFI_SUCCESS;
}
/**
Internal check for size array.
@param[in] VariablePropery Pointer to variable property.
@param[in] DataSize Data size.
@param[in] Data Pointer to data buffer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER The DataSize is not size array.
**/
EFI_STATUS
EFIAPI
InternalVarCheckSizeArray (
IN VAR_CHECK_VARIABLE_PROPERTY *VariablePropery,
IN UINTN DataSize,
IN VOID *Data
)
{
if ((DataSize % VariablePropery->MinSize) != 0) {
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
//
// To prevent name collisions with possible future globally defined variables,
// other internal firmware data variables that are not defined here must be
// saved with a unique VendorGuid other than EFI_GLOBAL_VARIABLE or
// any other GUID defined by the UEFI Specification. Implementations must
// only permit the creation of variables with a UEFI Specification-defined
// VendorGuid when these variables are documented in the UEFI Specification.
//
UEFI_DEFINED_VARIABLE_ENTRY mGlobalVariableList[] = {
{
EFI_LANG_CODES_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
InternalVarCheckAsciiString
},
{
EFI_LANG_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
1,
MAX_UINTN
},
InternalVarCheckAsciiString
},
{
EFI_TIME_OUT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
sizeof (UINT16)
},
NULL
},
{
EFI_PLATFORM_LANG_CODES_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
InternalVarCheckAsciiString
},
{
EFI_PLATFORM_LANG_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
1,
MAX_UINTN
},
InternalVarCheckAsciiString
},
{
EFI_CON_IN_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_CON_OUT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_ERR_OUT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_CON_IN_DEV_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_CON_OUT_DEV_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_ERR_OUT_DEV_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (EFI_DEVICE_PATH_PROTOCOL),
MAX_UINTN
},
InternalVarCheckDevicePath
},
{
EFI_BOOT_ORDER_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckSizeArray
},
{
EFI_BOOT_NEXT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
sizeof (UINT16)
},
NULL
},
{
EFI_BOOT_CURRENT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT16),
sizeof (UINT16)
},
NULL
},
{
EFI_BOOT_OPTION_SUPPORT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT32),
sizeof (UINT32)
},
NULL
},
{
EFI_DRIVER_ORDER_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckSizeArray
},
{
EFI_SYS_PREP_ORDER_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckSizeArray
},
{
EFI_HW_ERR_REC_SUPPORT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT16),
sizeof (UINT16)
},
NULL
},
{
EFI_SETUP_MODE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT8),
sizeof (UINT8)
},
NULL
},
{
EFI_KEY_EXCHANGE_KEY_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_AT,
1,
MAX_UINTN
},
NULL
},
{
EFI_PLATFORM_KEY_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_AT,
1,
MAX_UINTN
},
NULL
},
{
EFI_SIGNATURE_SUPPORT_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (EFI_GUID),
MAX_UINTN
},
InternalVarCheckSizeArray
},
{
EFI_SECURE_BOOT_MODE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT8),
sizeof (UINT8)
},
NULL
},
{
EFI_KEK_DEFAULT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
NULL
},
{
EFI_PK_DEFAULT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
NULL
},
{
EFI_DB_DEFAULT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
NULL
},
{
EFI_DBX_DEFAULT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
NULL
},
{
EFI_DBT_DEFAULT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
1,
MAX_UINTN
},
NULL
},
{
EFI_OS_INDICATIONS_SUPPORT_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT64),
sizeof (UINT64)
},
NULL
},
{
EFI_OS_INDICATIONS_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT64),
sizeof (UINT64)
},
NULL
},
{
EFI_VENDOR_KEYS_VARIABLE_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT8),
sizeof (UINT8)
},
NULL
},
};
UEFI_DEFINED_VARIABLE_ENTRY mGlobalVariableList2[] = {
{
L"Boot####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT32) + sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckLoadOption
},
{
L"Driver####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT32) + sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckLoadOption
},
{
L"SysPrep####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (UINT32) + sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckLoadOption
},
{
L"Key####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (EFI_KEY_OPTION),
sizeof (EFI_KEY_OPTION) + 3 * sizeof (EFI_INPUT_KEY)
},
InternalVarCheckKeyOption
},
{
L"PlatformRecovery####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_BS_RT,
sizeof (UINT32) + sizeof (UINT16),
MAX_UINTN
},
InternalVarCheckLoadOption
},
};
//
// EFI_IMAGE_SECURITY_DATABASE_GUID
//
UEFI_DEFINED_VARIABLE_ENTRY mImageSecurityVariableList[] = {
{
EFI_IMAGE_SECURITY_DATABASE,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_AT,
1,
MAX_UINTN
},
NULL
},
{
EFI_IMAGE_SECURITY_DATABASE1,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_AT,
1,
MAX_UINTN
},
NULL
},
{
EFI_IMAGE_SECURITY_DATABASE2,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_AT,
1,
MAX_UINTN
},
NULL
},
};
//
// EFI_HARDWARE_ERROR_VARIABLE
//
UEFI_DEFINED_VARIABLE_ENTRY mHwErrRecVariable = {
L"HwErrRec####",
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
0,
VARIABLE_ATTRIBUTE_NV_BS_RT_HR,
1,
MAX_UINTN
},
NULL
};
EFI_GUID *mUefiDefinedGuid[] = {
&gEfiGlobalVariableGuid,
&gEfiImageSecurityDatabaseGuid,
&gEfiHardwareErrorVariableGuid
};
/**
Check if a Unicode character is an upper case hexadecimal character.
This function checks if a Unicode character is an upper case
hexadecimal character. The valid upper case hexadecimal character is
L'0' to L'9', or L'A' to L'F'.
@param[in] Char The character to check against.
@retval TRUE If the Char is an upper case hexadecmial character.
@retval FALSE If the Char is not an upper case hexadecmial character.
**/
BOOLEAN
EFIAPI
VarCheckUefiIsHexaDecimalDigitCharacter (
IN CHAR16 Char
)
{
return (BOOLEAN) ((Char >= L'0' && Char <= L'9') || (Char >= L'A' && Char <= L'F'));
}
/**
This code checks if variable is hardware error record variable or not.
According to UEFI spec, hardware error record variable should use the EFI_HARDWARE_ERROR_VARIABLE VendorGuid
and have the L"HwErrRec####" name convention, #### is a printed hex value and no 0x or h is included in the hex value.
@param[in] VariableName Pointer to variable name.
@param[in] VendorGuid Variable Vendor Guid.
@retval TRUE Variable is hardware error record variable.
@retval FALSE Variable is not hardware error record variable.
**/
BOOLEAN
EFIAPI
IsHwErrRecVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid
)
{
if (!CompareGuid (VendorGuid, &gEfiHardwareErrorVariableGuid) ||
(StrLen (VariableName) != StrLen (L"HwErrRec####")) ||
(StrnCmp(VariableName, L"HwErrRec", StrLen (L"HwErrRec")) != 0) ||
!VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[0x8]) ||
!VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[0x9]) ||
!VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[0xA]) ||
!VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[0xB])) {
return FALSE;
}
return TRUE;
}
/**
Get UEFI defined var check function.
@param[in] VariableName Pointer to variable name.
@param[in] VendorGuid Pointer to variable vendor GUID.
@param[out] VariableProperty Pointer to variable property.
@return Internal var check function, NULL if no specific check function.
**/
INTERNAL_VAR_CHECK_FUNCTION
GetUefiDefinedVarCheckFunction (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT VAR_CHECK_VARIABLE_PROPERTY **VariableProperty
)
{
UINTN Index;
UINTN NameLength;
if (CompareGuid (VendorGuid, &gEfiGlobalVariableGuid)) {
//
// Try list 1, exactly match.
//
for (Index = 0; Index < sizeof (mGlobalVariableList)/sizeof (mGlobalVariableList[0]); Index++) {
if (StrCmp (mGlobalVariableList[Index].Name, VariableName) == 0) {
*VariableProperty = &(mGlobalVariableList[Index].VariableProperty);
return mGlobalVariableList[Index].CheckFunction;
}
}
//
// Try list 2.
//
NameLength = StrLen (VariableName) - 4;
for (Index = 0; Index < sizeof (mGlobalVariableList2)/sizeof (mGlobalVariableList2[0]); Index++) {
if ((StrLen (VariableName) == StrLen (mGlobalVariableList2[Index].Name)) &&
(StrnCmp (VariableName, mGlobalVariableList2[Index].Name, NameLength) == 0) &&
VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[NameLength]) &&
VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[NameLength + 1]) &&
VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[NameLength + 2]) &&
VarCheckUefiIsHexaDecimalDigitCharacter (VariableName[NameLength + 3])) {
*VariableProperty = &(mGlobalVariableList2[Index].VariableProperty);
return mGlobalVariableList2[Index].CheckFunction;
}
}
}
return NULL;
}
/**
SetVariable check handler UEFI defined.
@param[in] VariableName Name of Variable to set.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Attributes Attribute value of the variable.
@param[in] DataSize Size of Data to set.
@param[in] Data Data pointer.
@retval EFI_SUCCESS The SetVariable check result was success.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits, name, GUID,
DataSize and Data value was supplied.
@retval EFI_WRITE_PROTECTED The variable in question is read-only.
**/
EFI_STATUS
EFIAPI
SetVariableCheckHandlerUefiDefined (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data
)
{
EFI_STATUS Status;
UINTN Index;
VAR_CHECK_VARIABLE_PROPERTY Property;
VAR_CHECK_VARIABLE_PROPERTY *VarCheckProperty;
INTERNAL_VAR_CHECK_FUNCTION VarCheckFunction;
if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0)) || (Attributes == 0)) {
//
// Do not check delete variable.
//
return EFI_SUCCESS;
}
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
if (!IsHwErrRecVariable (VariableName, VendorGuid)) {
return EFI_INVALID_PARAMETER;
}
}
for (Index = 0; Index < sizeof (mUefiDefinedGuid)/sizeof (mUefiDefinedGuid[0]); Index++) {
if (CompareGuid (VendorGuid, mUefiDefinedGuid[Index])) {
if (VarCheckLibVariablePropertyGet (VariableName, VendorGuid, &Property) == EFI_NOT_FOUND) {
//
// To prevent name collisions with possible future globally defined variables,
// other internal firmware data variables that are not defined here must be
// saved with a unique VendorGuid other than EFI_GLOBAL_VARIABLE or
// any other GUID defined by the UEFI Specification. Implementations must
// only permit the creation of variables with a UEFI Specification-defined
// VendorGuid when these variables are documented in the UEFI Specification.
//
DEBUG ((EFI_D_INFO, "UEFI Variable Check fail %r - %s not in %g namespace\n", EFI_INVALID_PARAMETER, VariableName, VendorGuid));
return EFI_INVALID_PARAMETER;
}
}
}
if (DataSize == 0) {
return EFI_SUCCESS;
}
VarCheckProperty = NULL;
VarCheckFunction = GetUefiDefinedVarCheckFunction (VariableName, VendorGuid, &VarCheckProperty);
if (VarCheckFunction != NULL) {
Status = VarCheckFunction (
VarCheckProperty,
DataSize,
Data
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_INFO, "UEFI Variable Check function fail %r - %g:%s\n", Status, VendorGuid, VariableName));
return Status;
}
}
return EFI_SUCCESS;
}
/**
Variable property set for UEFI defined variables.
**/
VOID
VariablePropertySetUefiDefined (
VOID
)
{
UINTN Index;
//
// EFI_GLOBAL_VARIABLE
//
for (Index = 0; Index < sizeof (mGlobalVariableList)/sizeof (mGlobalVariableList[0]); Index++) {
VarCheckLibVariablePropertySet (
mGlobalVariableList[Index].Name,
&gEfiGlobalVariableGuid,
&mGlobalVariableList[Index].VariableProperty
);
}
for (Index = 0; Index < sizeof (mGlobalVariableList2)/sizeof (mGlobalVariableList2[0]); Index++) {
VarCheckLibVariablePropertySet (
mGlobalVariableList2[Index].Name,
&gEfiGlobalVariableGuid,
&mGlobalVariableList2[Index].VariableProperty
);
}
//
// EFI_IMAGE_SECURITY_DATABASE_GUID
//
for (Index = 0; Index < sizeof (mImageSecurityVariableList)/sizeof (mImageSecurityVariableList[0]); Index++) {
VarCheckLibVariablePropertySet (
mImageSecurityVariableList[Index].Name,
&gEfiImageSecurityDatabaseGuid,
&mImageSecurityVariableList[Index].VariableProperty
);
}
//
// EFI_HARDWARE_ERROR_VARIABLE
//
VarCheckLibVariablePropertySet (
mHwErrRecVariable.Name,
&gEfiHardwareErrorVariableGuid,
&mHwErrRecVariable.VariableProperty
);
}
/**
Constructor function of VarCheckUefiLib to set property and
register SetVariable check handler for UEFI defined variables.
@retval EFI_SUCCESS The constructor executed correctly.
**/
RETURN_STATUS
EFIAPI
VarCheckUefiLibNullClassConstructor (
VOID
)
{
VariablePropertySetUefiDefined ();
VarCheckLibRegisterSetVariableCheckHandler (SetVariableCheckHandlerUefiDefined);
return RETURN_SUCCESS;
}
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