lib/efi_selftest/efi_selftest_variables_runtime.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * efi_selftest_variables_runtime
  *
  * Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
  *
  * This unit test checks the runtime services for variables after
  * ExitBootServices():
  * GetVariable, GetNextVariableName, SetVariable, QueryVariableInfo.
  */

 #include <efi_selftest.h>
 #include <efi_variable.h>
 #include <u-boot/crc.h>

 #define EFI_ST_MAX_DATA_SIZE 16
 #define EFI_ST_MAX_VARNAME_SIZE 40

 static struct efi_boot_services *boottime;
 static struct efi_runtime_services *runtime;
 static const efi_guid_t guid_vendor0 = EFI_GLOBAL_VARIABLE_GUID;
 static const efi_guid_t __efi_runtime_data efi_rt_var_guid =
 						U_BOOT_EFI_RT_VAR_FILE_GUID;

 /*
  * Setup unit test.
  *
  * @handle	handle of the loaded image
  * @systable	system table
  */
 static int setup(const efi_handle_t img_handle,
 		 const struct efi_system_table *systable)
 {
 	boottime = systable->boottime;
 	runtime = systable->runtime;

 	return EFI_ST_SUCCESS;
 }

 /**
  * execute() - execute unit test
  *
  * As runtime support is not implmented expect EFI_UNSUPPORTED to be returned.
  */
 static int execute(void)
 {
 	efi_status_t ret;
 	efi_uintn_t len, avail, append_len = 17;
 	u32 attr;
 	u8 v[16] = {0x5d, 0xd1, 0x5e, 0x51, 0x5a, 0x05, 0xc7, 0x0c,
 		    0x35, 0x4a, 0xae, 0x87, 0xa5, 0xdf, 0x0f, 0x65,};
 	u8 v2[CONFIG_EFI_VAR_BUF_SIZE];
 	u8 data[EFI_ST_MAX_DATA_SIZE];
 	u8 data2[CONFIG_EFI_VAR_BUF_SIZE];
 	u16 varname[EFI_ST_MAX_VARNAME_SIZE];
 	efi_guid_t guid;
 	u64 max_storage, rem_storage, max_size;
 	int test_ret;

 	memset(v2, 0x1, sizeof(v2));

 	if (IS_ENABLED(CONFIG_EFI_VARIABLE_FILE_STORE)) {
 		test_ret = efi_st_query_variable_common(runtime, EFI_VARIABLE_BOOTSERVICE_ACCESS |
 								 EFI_VARIABLE_RUNTIME_ACCESS);
 		if (test_ret != EFI_ST_SUCCESS) {
 			efi_st_error("QueryVariableInfo failed\n");
 			return EFI_ST_FAILURE;
 		}
 	} else {
 		ret = runtime->query_variable_info(EFI_VARIABLE_BOOTSERVICE_ACCESS,
 					   &max_storage, &rem_storage,
 					   &max_size);
 		if (ret != EFI_UNSUPPORTED) {
 			efi_st_error("QueryVariableInfo failed\n");
 			return EFI_ST_FAILURE;
 		}
 	}

 	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 				    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 				    EFI_VARIABLE_RUNTIME_ACCESS,
 				    3, v + 4);
 	if (IS_ENABLED(CONFIG_EFI_RT_VOLATILE_STORE)) {
 		efi_uintn_t prev_len, delta;
 		struct efi_var_entry *var;
 		struct efi_var_file *hdr;

 		/* At runtime only non-volatile variables may be set. */
 		if (ret != EFI_INVALID_PARAMETER) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* runtime atttribute must be set */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    3, v + 4);
 		if (ret != EFI_INVALID_PARAMETER) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		len = sizeof(data);
 		ret = runtime->get_variable(u"RTStorageVolatile",
 					    &efi_rt_var_guid,
 					    &attr, &len, data);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("GetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		if (len != sizeof(EFI_VAR_FILE_NAME) ||
 		    memcmp(data, EFI_VAR_FILE_NAME, sizeof(EFI_VAR_FILE_NAME))) {
 			data[len - 1] = 0;
 			efi_st_error("RTStorageVolatile = %s\n", data);
 			return EFI_ST_FAILURE;
 		}

 		len = sizeof(data2);
 		ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
 					    &attr, &len, data2);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("GetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		/*
 		 * VarToFile size must change once a variable is inserted
 		 * Store it now, we'll use it later
 		 */
 		prev_len = len;
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    sizeof(v2),
 					    v2);
 		/*
 		 * This will try to update VarToFile as well and must fail,
 		 * without changing or deleting VarToFile
 		 */
 		if (ret != EFI_OUT_OF_RESOURCES) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		len = sizeof(data2);
 		ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
 					    &attr, &len, data2);
 		if (ret != EFI_SUCCESS || prev_len != len) {
 			efi_st_error("Get/SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Add an 8byte aligned variable */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    sizeof(v), v);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Delete it by setting the attrs to 0 */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    0, sizeof(v), v);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Add it back */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    sizeof(v), v);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Delete it again by setting the size to 0 */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    0, NULL);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Delete it again and make sure it's not there */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    0, NULL);
 		if (ret != EFI_NOT_FOUND) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/*
 		 * Add a non-aligned variable
 		 * VarToFile updates must include efi_st_var0
 		 */
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    9, v + 4);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		var = efi_var_mem_find(&guid_vendor0, u"efi_st_var0", NULL);
 		if (!var) {
 			efi_st_error("GetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		delta = efi_var_entry_len(var);
 		len = sizeof(data2);
 		ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
 					    &attr, &len, data2);
 		if (ret != EFI_SUCCESS || prev_len + delta != len) {
 			efi_st_error("Get/SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}

 		/*
 		 * Append on an existing variable must update VarToFile
 		 * Our variable entries are 8-byte aligned.
 		 * Adding a single byte will fit on the existing space
 		 */
 		prev_len = len;
 		avail = efi_var_entry_len(var) -
 			(sizeof(u16) * (u16_strlen(var->name) + 1) + sizeof(*var)) -
 			var->length;
 		if (avail >= append_len)
 			delta = 0;
 		else
 			delta = ALIGN(append_len - avail, 8);
 		ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_APPEND_WRITE |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    append_len, v2);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		len = sizeof(data2);
 		ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
 					    &attr, &len, data2);
 		if (ret != EFI_SUCCESS) {
 			efi_st_error("GetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 		if (prev_len + delta != len) {
 			efi_st_error("Unexpected VarToFile size");
 			return EFI_ST_FAILURE;
 		}

 		/* Make sure that variable contains a valid file */
 		hdr = (struct efi_var_file *)data2;
 		if (hdr->magic != EFI_VAR_FILE_MAGIC ||
 		    len != hdr->length ||
 		    hdr->crc32 != crc32(0, (u8 *)((uintptr_t)data2 + sizeof(struct efi_var_file)),
 					len - sizeof(struct efi_var_file))) {
 			efi_st_error("VarToFile invalid header\n");
 			return EFI_ST_FAILURE;
 		}

 		/* Variables that are BS, RT and volatile are RO after EBS */
 		ret = runtime->set_variable(u"VarToFile", &efi_rt_var_guid,
 					    EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					    EFI_VARIABLE_RUNTIME_ACCESS |
 					    EFI_VARIABLE_NON_VOLATILE,
 					    sizeof(v), v);
 		if (ret != EFI_WRITE_PROTECTED) {
 			efi_st_error("Get/SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 	} else {
 		if (ret != EFI_UNSUPPORTED) {
 			efi_st_error("SetVariable failed\n");
 			return EFI_ST_FAILURE;
 		}
 	}
 	len = EFI_ST_MAX_DATA_SIZE;
 	ret = runtime->get_variable(u"PlatformLangCodes", &guid_vendor0,
 				    &attr, &len, data);
 	if (ret != EFI_SUCCESS) {
 		efi_st_error("GetVariable failed\n");
 		return EFI_ST_FAILURE;
 	}
 	memset(&guid, 0, 16);
 	*varname = 0;
 	len = 2 * EFI_ST_MAX_VARNAME_SIZE;
 	ret = runtime->get_next_variable_name(&len, varname, &guid);
 	if (ret != EFI_SUCCESS) {
 		efi_st_error("GetNextVariableName failed\n");
 		return EFI_ST_FAILURE;
 	}

 	return EFI_ST_SUCCESS;
 }

 EFI_UNIT_TEST(variables_run) = {
 	.name = "variables at runtime",
 	.phase = EFI_SETUP_BEFORE_BOOTTIME_EXIT,
 	.setup = setup,
 	.execute = execute,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* efi_selftest_variables_runtime
	*
	* Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
	*
	* This unit test checks the runtime services for variables after
	* ExitBootServices():
	* GetVariable, GetNextVariableName, SetVariable, QueryVariableInfo.
	*/

	#include <efi_selftest.h>
	#include <efi_variable.h>
	#include <u-boot/crc.h>

	#define EFI_ST_MAX_DATA_SIZE 16
	#define EFI_ST_MAX_VARNAME_SIZE 40

	static struct efi_boot_services *boottime;
	static struct efi_runtime_services *runtime;
	static const efi_guid_t guid_vendor0 = EFI_GLOBAL_VARIABLE_GUID;
	static const efi_guid_t __efi_runtime_data efi_rt_var_guid =
	U_BOOT_EFI_RT_VAR_FILE_GUID;

	/*
	* Setup unit test.
	*
	* @handle handle of the loaded image
	* @systable system table
	*/
	static int setup(const efi_handle_t img_handle,
	const struct efi_system_table *systable)
	{
	boottime = systable->boottime;
	runtime = systable->runtime;

	return EFI_ST_SUCCESS;
	}

	/**
	* execute() - execute unit test
	*
	* As runtime support is not implmented expect EFI_UNSUPPORTED to be returned.
	*/
	static int execute(void)
	{
	efi_status_t ret;
	efi_uintn_t len, avail, append_len = 17;
	u32 attr;
	u8 v[16] = {0x5d, 0xd1, 0x5e, 0x51, 0x5a, 0x05, 0xc7, 0x0c,
	0x35, 0x4a, 0xae, 0x87, 0xa5, 0xdf, 0x0f, 0x65,};
	u8 v2[CONFIG_EFI_VAR_BUF_SIZE];
	u8 data[EFI_ST_MAX_DATA_SIZE];
	u8 data2[CONFIG_EFI_VAR_BUF_SIZE];
	u16 varname[EFI_ST_MAX_VARNAME_SIZE];
	efi_guid_t guid;
	u64 max_storage, rem_storage, max_size;
	int test_ret;

	memset(v2, 0x1, sizeof(v2));

	if (IS_ENABLED(CONFIG_EFI_VARIABLE_FILE_STORE)) {
	test_ret = efi_st_query_variable_common(runtime, EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS);
	if (test_ret != EFI_ST_SUCCESS) {
	efi_st_error("QueryVariableInfo failed\n");
	return EFI_ST_FAILURE;
	}
	} else {
	ret = runtime->query_variable_info(EFI_VARIABLE_BOOTSERVICE_ACCESS,
	&max_storage, &rem_storage,
	&max_size);
	if (ret != EFI_UNSUPPORTED) {
	efi_st_error("QueryVariableInfo failed\n");
	return EFI_ST_FAILURE;
	}
	}

	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS,
	3, v + 4);
	if (IS_ENABLED(CONFIG_EFI_RT_VOLATILE_STORE)) {
	efi_uintn_t prev_len, delta;
	struct efi_var_entry *var;
	struct efi_var_file *hdr;

	/* At runtime only non-volatile variables may be set. */
	if (ret != EFI_INVALID_PARAMETER) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* runtime atttribute must be set */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	3, v + 4);
	if (ret != EFI_INVALID_PARAMETER) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	len = sizeof(data);
	ret = runtime->get_variable(u"RTStorageVolatile",
	&efi_rt_var_guid,
	&attr, &len, data);
	if (ret != EFI_SUCCESS) {
	efi_st_error("GetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	if (len != sizeof(EFI_VAR_FILE_NAME) \|\|
	memcmp(data, EFI_VAR_FILE_NAME, sizeof(EFI_VAR_FILE_NAME))) {
	data[len - 1] = 0;
	efi_st_error("RTStorageVolatile = %s\n", data);
	return EFI_ST_FAILURE;
	}

	len = sizeof(data2);
	ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
	&attr, &len, data2);
	if (ret != EFI_SUCCESS) {
	efi_st_error("GetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	/*
	* VarToFile size must change once a variable is inserted
	* Store it now, we'll use it later
	*/
	prev_len = len;
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	sizeof(v2),
	v2);
	/*
	* This will try to update VarToFile as well and must fail,
	* without changing or deleting VarToFile
	*/
	if (ret != EFI_OUT_OF_RESOURCES) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	len = sizeof(data2);
	ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
	&attr, &len, data2);
	if (ret != EFI_SUCCESS \|\| prev_len != len) {
	efi_st_error("Get/SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* Add an 8byte aligned variable */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	sizeof(v), v);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* Delete it by setting the attrs to 0 */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	0, sizeof(v), v);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* Add it back */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	sizeof(v), v);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* Delete it again by setting the size to 0 */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	0, NULL);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/* Delete it again and make sure it's not there */
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	0, NULL);
	if (ret != EFI_NOT_FOUND) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/*
	* Add a non-aligned variable
	* VarToFile updates must include efi_st_var0
	*/
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	9, v + 4);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	var = efi_var_mem_find(&guid_vendor0, u"efi_st_var0", NULL);
	if (!var) {
	efi_st_error("GetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	delta = efi_var_entry_len(var);
	len = sizeof(data2);
	ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
	&attr, &len, data2);
	if (ret != EFI_SUCCESS \|\| prev_len + delta != len) {
	efi_st_error("Get/SetVariable failed\n");
	return EFI_ST_FAILURE;
	}

	/*
	* Append on an existing variable must update VarToFile
	* Our variable entries are 8-byte aligned.
	* Adding a single byte will fit on the existing space
	*/
	prev_len = len;
	avail = efi_var_entry_len(var) -
	(sizeof(u16) * (u16_strlen(var->name) + 1) + sizeof(*var)) -
	var->length;
	if (avail >= append_len)
	delta = 0;
	else
	delta = ALIGN(append_len - avail, 8);
	ret = runtime->set_variable(u"efi_st_var0", &guid_vendor0,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_APPEND_WRITE \|
	EFI_VARIABLE_NON_VOLATILE,
	append_len, v2);
	if (ret != EFI_SUCCESS) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	len = sizeof(data2);
	ret = runtime->get_variable(u"VarToFile", &efi_rt_var_guid,
	&attr, &len, data2);
	if (ret != EFI_SUCCESS) {
	efi_st_error("GetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	if (prev_len + delta != len) {
	efi_st_error("Unexpected VarToFile size");
	return EFI_ST_FAILURE;
	}

	/* Make sure that variable contains a valid file */
	hdr = (struct efi_var_file *)data2;
	if (hdr->magic != EFI_VAR_FILE_MAGIC \|\|
	len != hdr->length \|\|
	hdr->crc32 != crc32(0, (u8 *)((uintptr_t)data2 + sizeof(struct efi_var_file)),
	len - sizeof(struct efi_var_file))) {
	efi_st_error("VarToFile invalid header\n");
	return EFI_ST_FAILURE;
	}

	/* Variables that are BS, RT and volatile are RO after EBS */
	ret = runtime->set_variable(u"VarToFile", &efi_rt_var_guid,
	EFI_VARIABLE_BOOTSERVICE_ACCESS \|
	EFI_VARIABLE_RUNTIME_ACCESS \|
	EFI_VARIABLE_NON_VOLATILE,
	sizeof(v), v);
	if (ret != EFI_WRITE_PROTECTED) {
	efi_st_error("Get/SetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	} else {
	if (ret != EFI_UNSUPPORTED) {
	efi_st_error("SetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	}
	len = EFI_ST_MAX_DATA_SIZE;
	ret = runtime->get_variable(u"PlatformLangCodes", &guid_vendor0,
	&attr, &len, data);
	if (ret != EFI_SUCCESS) {
	efi_st_error("GetVariable failed\n");
	return EFI_ST_FAILURE;
	}
	memset(&guid, 0, 16);
	*varname = 0;
	len = 2 * EFI_ST_MAX_VARNAME_SIZE;
	ret = runtime->get_next_variable_name(&len, varname, &guid);
	if (ret != EFI_SUCCESS) {
	efi_st_error("GetNextVariableName failed\n");
	return EFI_ST_FAILURE;
	}

	return EFI_ST_SUCCESS;
	}

	EFI_UNIT_TEST(variables_run) = {
	.name = "variables at runtime",
	.phase = EFI_SETUP_BEFORE_BOOTTIME_EXIT,
	.setup = setup,
	.execute = execute,
	};