619 lines
14 KiB
C
619 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Integrate UEFI variables to u-boot env interface
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*
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* Copyright (c) 2018 AKASHI Takahiro, Linaro Limited
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*/
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#include <charset.h>
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#include <common.h>
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#include <command.h>
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#include <efi_loader.h>
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#include <env.h>
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#include <exports.h>
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#include <hexdump.h>
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#include <malloc.h>
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#include <mapmem.h>
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#include <linux/kernel.h>
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/*
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* From efi_variable.c,
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*
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* Mapping between UEFI variables and u-boot variables:
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*
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* efi_$guid_$varname = {attributes}(type)value
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*/
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static const struct {
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u32 mask;
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char *text;
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} efi_var_attrs[] = {
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{EFI_VARIABLE_NON_VOLATILE, "NV"},
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{EFI_VARIABLE_BOOTSERVICE_ACCESS, "BS"},
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{EFI_VARIABLE_RUNTIME_ACCESS, "RT"},
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{EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, "AW"},
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{EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS, "AT"},
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};
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static const struct {
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efi_guid_t guid;
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char *text;
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} efi_guid_text[] = {
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/* signature database */
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{EFI_GLOBAL_VARIABLE_GUID, "EFI_GLOBAL_VARIABLE_GUID"},
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};
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/* "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" */
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static char unknown_guid[37];
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/**
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* efi_guid_to_str() - convert guid to readable name
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*
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* @guid: GUID
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* Return: string for GUID
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*
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* convert guid to readable name
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*/
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static const char *efi_guid_to_str(const efi_guid_t *guid)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(efi_guid_text); i++)
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if (!guidcmp(guid, &efi_guid_text[i].guid))
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return efi_guid_text[i].text;
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uuid_bin_to_str((unsigned char *)guid->b, unknown_guid,
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UUID_STR_FORMAT_GUID);
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return unknown_guid;
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}
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/**
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* efi_dump_single_var() - show information about a UEFI variable
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*
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* @name: Name of the variable
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* @guid: Vendor GUID
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* @verbose: if true, dump data
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*
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* Show information encoded in one UEFI variable
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*/
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static void efi_dump_single_var(u16 *name, const efi_guid_t *guid, bool verbose)
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{
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u32 attributes;
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u8 *data;
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efi_uintn_t size;
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int count, i;
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efi_status_t ret;
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data = NULL;
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size = 0;
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ret = EFI_CALL(efi_get_variable(name, guid, &attributes, &size, data));
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if (ret == EFI_BUFFER_TOO_SMALL) {
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data = malloc(size);
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if (!data)
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goto out;
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ret = EFI_CALL(efi_get_variable(name, guid, &attributes, &size,
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data));
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}
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if (ret == EFI_NOT_FOUND) {
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printf("Error: \"%ls\" not defined\n", name);
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goto out;
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}
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if (ret != EFI_SUCCESS)
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goto out;
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printf("%ls:\n %s:", name, efi_guid_to_str(guid));
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for (count = 0, i = 0; i < ARRAY_SIZE(efi_var_attrs); i++)
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if (attributes & efi_var_attrs[i].mask) {
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if (count)
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putc('|');
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else
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putc(' ');
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count++;
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puts(efi_var_attrs[i].text);
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}
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printf(", DataSize = 0x%zx\n", size);
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if (verbose)
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print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
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data, size, true);
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out:
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free(data);
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}
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/**
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* efi_dump_vars() - show information about named UEFI variables
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*
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* @argc: Number of arguments (variables)
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* @argv: Argument (variable name) array
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* @verbose: if true, dump data
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* Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
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*
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* Show information encoded in named UEFI variables
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*/
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static int efi_dump_vars(int argc, char * const argv[],
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const efi_guid_t *guid, bool verbose)
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{
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u16 *var_name16, *p;
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efi_uintn_t buf_size, size;
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buf_size = 128;
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var_name16 = malloc(buf_size);
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if (!var_name16)
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return CMD_RET_FAILURE;
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for (; argc > 0; argc--, argv++) {
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size = (utf8_utf16_strlen(argv[0]) + 1) * sizeof(u16);
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if (buf_size < size) {
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buf_size = size;
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p = realloc(var_name16, buf_size);
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if (!p) {
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free(var_name16);
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return CMD_RET_FAILURE;
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}
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var_name16 = p;
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}
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p = var_name16;
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utf8_utf16_strcpy(&p, argv[0]);
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efi_dump_single_var(var_name16, guid, verbose);
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}
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free(var_name16);
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return CMD_RET_SUCCESS;
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}
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static bool match_name(int argc, char * const argv[], u16 *var_name16)
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{
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char *buf, *p;
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size_t buflen;
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int i;
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bool result = false;
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buflen = utf16_utf8_strlen(var_name16) + 1;
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buf = calloc(1, buflen);
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if (!buf)
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return result;
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p = buf;
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utf16_utf8_strcpy(&p, var_name16);
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for (i = 0; i < argc; argc--, argv++) {
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if (!strcmp(buf, argv[i])) {
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result = true;
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goto out;
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}
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}
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out:
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free(buf);
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return result;
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}
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/**
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* efi_dump_var_all() - show information about all the UEFI variables
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*
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* @argc: Number of arguments (variables)
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* @argv: Argument (variable name) array
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* @verbose: if true, dump data
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* Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
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*
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* Show information encoded in all the UEFI variables
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*/
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static int efi_dump_var_all(int argc, char * const argv[],
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const efi_guid_t *guid_p, bool verbose)
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{
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u16 *var_name16, *p;
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efi_uintn_t buf_size, size;
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efi_guid_t guid;
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efi_status_t ret;
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if (argc && guid_p)
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/* simplified case */
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return efi_dump_vars(argc, argv, guid_p, verbose);
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buf_size = 128;
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var_name16 = malloc(buf_size);
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if (!var_name16)
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return CMD_RET_FAILURE;
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var_name16[0] = 0;
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for (;;) {
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size = buf_size;
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ret = EFI_CALL(efi_get_next_variable_name(&size, var_name16,
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&guid));
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if (ret == EFI_NOT_FOUND)
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break;
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if (ret == EFI_BUFFER_TOO_SMALL) {
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buf_size = size;
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p = realloc(var_name16, buf_size);
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if (!p) {
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free(var_name16);
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return CMD_RET_FAILURE;
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}
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var_name16 = p;
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ret = EFI_CALL(efi_get_next_variable_name(&size,
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var_name16,
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&guid));
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}
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if (ret != EFI_SUCCESS) {
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free(var_name16);
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return CMD_RET_FAILURE;
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}
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if ((!guid_p || !guidcmp(guid_p, &guid)) &&
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(!argc || match_name(argc, argv, var_name16)))
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efi_dump_single_var(var_name16, &guid, verbose);
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}
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free(var_name16);
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return CMD_RET_SUCCESS;
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}
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/**
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* do_env_print_efi() - show information about UEFI variables
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*
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* @cmdtp: Command table
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* @flag: Command flag
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* @argc: Number of arguments
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* @argv: Argument array
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* Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
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*
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* This function is for "env print -e" or "printenv -e" command:
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* => env print -e [-n] [-guid <guid> | -all] [var [...]]
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* If one or more variable names are specified, show information
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* named UEFI variables, otherwise show all the UEFI variables.
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*/
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int do_env_print_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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efi_guid_t guid;
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const efi_guid_t *guid_p;
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bool default_guid, guid_any, verbose;
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efi_status_t ret;
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/* Initialize EFI drivers */
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ret = efi_init_obj_list();
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if (ret != EFI_SUCCESS) {
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printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
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ret & ~EFI_ERROR_MASK);
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return CMD_RET_FAILURE;
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}
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default_guid = true;
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guid_any = false;
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verbose = true;
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for (argc--, argv++; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
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if (!strcmp(argv[0], "-guid")) {
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if (argc == 1)
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return CMD_RET_USAGE;
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/* -a already specified */
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if (!default_guid & guid_any)
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return CMD_RET_USAGE;
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argc--;
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argv++;
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if (uuid_str_to_bin(argv[0], guid.b,
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UUID_STR_FORMAT_GUID))
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return CMD_RET_USAGE;
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default_guid = false;
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} else if (!strcmp(argv[0], "-all")) {
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/* -guid already specified */
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if (!default_guid && !guid_any)
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return CMD_RET_USAGE;
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guid_any = true;
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default_guid = false;
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} else if (!strcmp(argv[0], "-n")) {
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verbose = false;
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} else {
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return CMD_RET_USAGE;
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||
|
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}
|
||
|
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}
|
||
|
|
|
||
|
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if (guid_any)
|
||
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guid_p = NULL;
|
||
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else if (default_guid)
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||
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guid_p = &efi_global_variable_guid;
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else
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guid_p = (const efi_guid_t *)guid.b;
|
||
|
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|
||
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/* enumerate and show all UEFI variables */
|
||
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return efi_dump_var_all(argc, argv, guid_p, verbose);
|
||
|
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}
|
||
|
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|
||
|
|
/**
|
||
|
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* append_value() - encode UEFI variable's value
|
||
|
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* @bufp: Buffer of encoded UEFI variable's value
|
||
|
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* @sizep: Size of buffer
|
||
|
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* @data: data to be encoded into the value
|
||
|
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* Return: 0 on success, -1 otherwise
|
||
|
|
*
|
||
|
|
* Interpret a given data string and append it to buffer.
|
||
|
|
* Buffer will be realloc'ed if necessary.
|
||
|
|
*
|
||
|
|
* Currently supported formats are:
|
||
|
|
* =0x0123...: Hexadecimal number
|
||
|
|
* =H0123...: Hexadecimal-byte array
|
||
|
|
* ="...", =S"..." or <string>:
|
||
|
|
* String
|
||
|
|
*/
|
||
|
|
static int append_value(char **bufp, size_t *sizep, char *data)
|
||
|
|
{
|
||
|
|
char *tmp_buf = NULL, *new_buf = NULL, *value;
|
||
|
|
unsigned long len = 0;
|
||
|
|
|
||
|
|
if (!strncmp(data, "=0x", 2)) { /* hexadecimal number */
|
||
|
|
union {
|
||
|
|
u8 u8;
|
||
|
|
u16 u16;
|
||
|
|
u32 u32;
|
||
|
|
u64 u64;
|
||
|
|
} tmp_data;
|
||
|
|
unsigned long hex_value;
|
||
|
|
void *hex_ptr;
|
||
|
|
|
||
|
|
data += 3;
|
||
|
|
len = strlen(data);
|
||
|
|
if ((len & 0x1)) /* not multiple of two */
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
len /= 2;
|
||
|
|
if (len > 8)
|
||
|
|
return -1;
|
||
|
|
else if (len > 4)
|
||
|
|
len = 8;
|
||
|
|
else if (len > 2)
|
||
|
|
len = 4;
|
||
|
|
|
||
|
|
/* convert hex hexadecimal number */
|
||
|
|
if (strict_strtoul(data, 16, &hex_value) < 0)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
tmp_buf = malloc(len);
|
||
|
|
if (!tmp_buf)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (len == 1) {
|
||
|
|
tmp_data.u8 = hex_value;
|
||
|
|
hex_ptr = &tmp_data.u8;
|
||
|
|
} else if (len == 2) {
|
||
|
|
tmp_data.u16 = hex_value;
|
||
|
|
hex_ptr = &tmp_data.u16;
|
||
|
|
} else if (len == 4) {
|
||
|
|
tmp_data.u32 = hex_value;
|
||
|
|
hex_ptr = &tmp_data.u32;
|
||
|
|
} else {
|
||
|
|
tmp_data.u64 = hex_value;
|
||
|
|
hex_ptr = &tmp_data.u64;
|
||
|
|
}
|
||
|
|
memcpy(tmp_buf, hex_ptr, len);
|
||
|
|
value = tmp_buf;
|
||
|
|
|
||
|
|
} else if (!strncmp(data, "=H", 2)) { /* hexadecimal-byte array */
|
||
|
|
data += 2;
|
||
|
|
len = strlen(data);
|
||
|
|
if (len & 0x1) /* not multiple of two */
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
len /= 2;
|
||
|
|
tmp_buf = malloc(len);
|
||
|
|
if (!tmp_buf)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (hex2bin((u8 *)tmp_buf, data, len) < 0) {
|
||
|
|
printf("Error: illegal hexadecimal string\n");
|
||
|
|
free(tmp_buf);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
value = tmp_buf;
|
||
|
|
} else { /* string */
|
||
|
|
if (!strncmp(data, "=\"", 2) || !strncmp(data, "=S\"", 3)) {
|
||
|
|
if (data[1] == '"')
|
||
|
|
data += 2;
|
||
|
|
else
|
||
|
|
data += 3;
|
||
|
|
value = data;
|
||
|
|
len = strlen(data) - 1;
|
||
|
|
if (data[len] != '"')
|
||
|
|
return -1;
|
||
|
|
} else {
|
||
|
|
value = data;
|
||
|
|
len = strlen(data);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
new_buf = realloc(*bufp, *sizep + len);
|
||
|
|
if (!new_buf)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
memcpy(new_buf + *sizep, value, len);
|
||
|
|
*bufp = new_buf;
|
||
|
|
*sizep += len;
|
||
|
|
|
||
|
|
out:
|
||
|
|
free(tmp_buf);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* do_env_set_efi() - set UEFI variable
|
||
|
|
*
|
||
|
|
* @cmdtp: Command table
|
||
|
|
* @flag: Command flag
|
||
|
|
* @argc: Number of arguments
|
||
|
|
* @argv: Argument array
|
||
|
|
* Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
|
||
|
|
*
|
||
|
|
* This function is for "env set -e" or "setenv -e" command:
|
||
|
|
* => env set -e [-guid guid][-nv][-bs][-rt][-a][-v]
|
||
|
|
* [-i address,size] var, or
|
||
|
|
* var [value ...]
|
||
|
|
* Encode values specified and set given UEFI variable.
|
||
|
|
* If no value is specified, delete the variable.
|
||
|
|
*/
|
||
|
|
int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
||
|
|
{
|
||
|
|
char *var_name, *value, *ep;
|
||
|
|
ulong addr;
|
||
|
|
efi_uintn_t size;
|
||
|
|
efi_guid_t guid;
|
||
|
|
u32 attributes;
|
||
|
|
bool default_guid, verbose, value_on_memory;
|
||
|
|
u16 *var_name16 = NULL, *p;
|
||
|
|
size_t len;
|
||
|
|
efi_status_t ret;
|
||
|
|
|
||
|
|
if (argc == 1)
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
|
||
|
|
/* Initialize EFI drivers */
|
||
|
|
ret = efi_init_obj_list();
|
||
|
|
if (ret != EFI_SUCCESS) {
|
||
|
|
printf("Error: Cannot initialize UEFI sub-system, r = %lu\n",
|
||
|
|
ret & ~EFI_ERROR_MASK);
|
||
|
|
return CMD_RET_FAILURE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
|
||
|
|
* EFI_VARIABLE_RUNTIME_ACCESS;
|
||
|
|
*/
|
||
|
|
value = NULL;
|
||
|
|
size = 0;
|
||
|
|
attributes = 0;
|
||
|
|
guid = efi_global_variable_guid;
|
||
|
|
default_guid = true;
|
||
|
|
verbose = false;
|
||
|
|
value_on_memory = false;
|
||
|
|
for (argc--, argv++; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
|
||
|
|
if (!strcmp(argv[0], "-guid")) {
|
||
|
|
if (argc == 1)
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
|
||
|
|
argc--;
|
||
|
|
argv++;
|
||
|
|
if (uuid_str_to_bin(argv[0], guid.b,
|
||
|
|
UUID_STR_FORMAT_GUID)) {
|
||
|
|
printf("## Guid not specified or in XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX format\n");
|
||
|
|
return CMD_RET_FAILURE;
|
||
|
|
}
|
||
|
|
default_guid = false;
|
||
|
|
} else if (!strcmp(argv[0], "-bs")) {
|
||
|
|
attributes |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
|
||
|
|
} else if (!strcmp(argv[0], "-rt")) {
|
||
|
|
attributes |= EFI_VARIABLE_RUNTIME_ACCESS;
|
||
|
|
} else if (!strcmp(argv[0], "-nv")) {
|
||
|
|
attributes |= EFI_VARIABLE_NON_VOLATILE;
|
||
|
|
} else if (!strcmp(argv[0], "-a")) {
|
||
|
|
attributes |= EFI_VARIABLE_APPEND_WRITE;
|
||
|
|
} else if (!strcmp(argv[0], "-i")) {
|
||
|
|
/* data comes from memory */
|
||
|
|
if (argc == 1)
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
|
||
|
|
argc--;
|
||
|
|
argv++;
|
||
|
|
addr = simple_strtoul(argv[0], &ep, 16);
|
||
|
|
if (*ep != ',')
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
|
||
|
|
size = simple_strtoul(++ep, NULL, 16);
|
||
|
|
if (!size)
|
||
|
|
return CMD_RET_FAILURE;
|
||
|
|
value_on_memory = true;
|
||
|
|
} else if (!strcmp(argv[0], "-v")) {
|
||
|
|
verbose = true;
|
||
|
|
} else {
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!argc)
|
||
|
|
return CMD_RET_USAGE;
|
||
|
|
|
||
|
|
var_name = argv[0];
|
||
|
|
if (default_guid)
|
||
|
|
guid = efi_global_variable_guid;
|
||
|
|
|
||
|
|
if (verbose) {
|
||
|
|
printf("GUID: %s\n", efi_guid_to_str((const efi_guid_t *)
|
||
|
|
&guid));
|
||
|
|
printf("Attributes: 0x%x\n", attributes);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* for value */
|
||
|
|
if (value_on_memory)
|
||
|
|
value = map_sysmem(addr, 0);
|
||
|
|
else if (argc > 1)
|
||
|
|
for (argc--, argv++; argc > 0; argc--, argv++)
|
||
|
|
if (append_value(&value, &size, argv[0]) < 0) {
|
||
|
|
printf("## Failed to process an argument, %s\n",
|
||
|
|
argv[0]);
|
||
|
|
ret = CMD_RET_FAILURE;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (size && verbose) {
|
||
|
|
printf("Value:\n");
|
||
|
|
print_hex_dump(" ", DUMP_PREFIX_OFFSET,
|
||
|
|
16, 1, value, size, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
len = utf8_utf16_strnlen(var_name, strlen(var_name));
|
||
|
|
var_name16 = malloc((len + 1) * 2);
|
||
|
|
if (!var_name16) {
|
||
|
|
printf("## Out of memory\n");
|
||
|
|
ret = CMD_RET_FAILURE;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
p = var_name16;
|
||
|
|
utf8_utf16_strncpy(&p, var_name, len + 1);
|
||
|
|
|
||
|
|
ret = EFI_CALL(efi_set_variable(var_name16, &guid, attributes,
|
||
|
|
size, value));
|
||
|
|
unmap_sysmem(value);
|
||
|
|
if (ret == EFI_SUCCESS) {
|
||
|
|
ret = CMD_RET_SUCCESS;
|
||
|
|
} else {
|
||
|
|
const char *msg;
|
||
|
|
|
||
|
|
switch (ret) {
|
||
|
|
case EFI_NOT_FOUND:
|
||
|
|
msg = " (not found)";
|
||
|
|
break;
|
||
|
|
case EFI_WRITE_PROTECTED:
|
||
|
|
msg = " (read only)";
|
||
|
|
break;
|
||
|
|
case EFI_INVALID_PARAMETER:
|
||
|
|
msg = " (invalid parameter)";
|
||
|
|
break;
|
||
|
|
case EFI_SECURITY_VIOLATION:
|
||
|
|
msg = " (validation failed)";
|
||
|
|
break;
|
||
|
|
case EFI_OUT_OF_RESOURCES:
|
||
|
|
msg = " (out of memory)";
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
msg = "";
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
printf("## Failed to set EFI variable%s\n", msg);
|
||
|
|
ret = CMD_RET_FAILURE;
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
if (value_on_memory)
|
||
|
|
unmap_sysmem(value);
|
||
|
|
else
|
||
|
|
free(value);
|
||
|
|
free(var_name16);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|