U-Boot. Исходные тексты команд: nvedit_efi.c // SPDX-License-Identifier: GPL-2.0+
/*
* Integrate UEFI variables to u-boot env interface
*
* Copyright (c) 2018 AKASHI Takahiro, Linaro Limited
*/
#include <charset.h>
#include <common.h>
#include <command.h>
#include <efi_loader.h>
#include <efi_variable.h>
#include <env.h>
#include <exports.h>
#include <hexdump.h>
#include <malloc.h>
#include <mapmem.h>
#include <rtc.h>
#include <uuid.h>
#include <linux/kernel.h>
/*
* From efi_variable.c,
*
* Mapping between UEFI variables and u-boot variables:
*
* efi_$guid_$varname = {attributes}(type)value
*/
static const struct {
u32 mask;
char *text;
} efi_var_attrs[] = {
{EFI_VARIABLE_NON_VOLATILE, "NV"},
{EFI_VARIABLE_BOOTSERVICE_ACCESS, "BS"},
{EFI_VARIABLE_RUNTIME_ACCESS, "RT"},
{EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, "AW"},
{EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS, "AT"},
{EFI_VARIABLE_READ_ONLY, "RO"},
};
/**
* efi_dump_single_var() - show information about a UEFI variable
*
* @name: Name of the variable
* @guid: Vendor GUID
* @verbose: if true, dump data
*
* Show information encoded in one UEFI variable
*/
static void efi_dump_single_var(u16 *name, const efi_guid_t *guid, bool verbose)
{
u32 attributes;
u8 *data;
u64 time;
struct rtc_time tm;
efi_uintn_t size;
int count, i;
efi_status_t ret;
data = NULL;
size = 0;
ret = efi_get_variable_int(name, guid, &attributes, &size, data, &time);
if (ret == EFI_BUFFER_TOO_SMALL) {
data = malloc(size);
if (!data)
goto out;
ret = efi_get_variable_int(name, guid, &attributes, &size,
data, &time);
}
if (ret == EFI_NOT_FOUND) {
printf("Error: \"%ls\" not defined\n", name);
goto out;
}
if (ret != EFI_SUCCESS)
goto out;
rtc_to_tm(time, &tm);
printf("%ls:\n %pUl (%pUs)\n", name, guid, guid);
if (attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
printf(" %04d-%02d-%02d %02d:%02d:%02d\n", tm.tm_year,
tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
printf(" ");
for (count = 0, i = 0; i < ARRAY_SIZE(efi_var_attrs); i++)
if (attributes & efi_var_attrs[i].mask) {
if (count)
putc('|');
count++;
puts(efi_var_attrs[i].text);
}
printf(", DataSize = 0x%zx\n", size);
if (verbose)
print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
data, size, true);
out:
free(data);
}
static bool match_name(int argc, char *const argv[], u16 *var_name16)
{
char *buf, *p;
size_t buflen;
int i;
bool result = false;
buflen = utf16_utf8_strlen(var_name16) + 1;
buf = calloc(1, buflen);
if (!buf)
return result;
p = buf;
utf16_utf8_strcpy(&p, var_name16);
for (i = 0; i < argc; argc--, argv++) {
if (!strcmp(buf, argv[i])) {
result = true;
goto out;
}
}
out:
free(buf);
return result;
}
/**
* efi_dump_var_all() - show information about all the UEFI variables
*
* @argc: Number of arguments (variables)
* @argv: Argument (variable name) array
* @verbose: if true, dump data
* Return: CMD_RET_SUCCESS on success, or CMD_RET_RET_FAILURE
*
* Show information encoded in all the UEFI variables
*/
static int efi_dump_var_all(int argc, char *const argv[],
const efi_guid_t *guid_p, bool verbose)
{
u16 *var_name16, *p;
efi_uintn_t buf_size, size;
efi_guid_t guid;
efi_status_t ret;
bool match = false;
buf_size = 128;
var_name16 = malloc(buf_size);
if (!var_name16)
return CMD_RET_FAILURE;
var_name16[0] = 0;
for (;;) {
size = buf_size;
ret = efi_get_next_variable_name_int(&size, var_name16,
&guid);
if (ret == EFI_NOT_FOUND)
break;
if (ret == EFI_BUFFER_TOO_SMALL) {
buf_size = size;
p = realloc(var_name16, buf_size);
if (!p) {
free(var_name16);
return CMD_RET_FAILURE;
}
var_name16 = p;
ret = efi_get_next_variable_name_int(&size, var_name16,
&guid);
}
if (ret != EFI_SUCCESS) {
free(var_name16);
return CMD_RET_FAILURE;
}
if (guid_p && guidcmp(guid_p, &guid))
continue;
if (!argc || match_name(argc, argv, var_name16)) {
match = true;
efi_dump_single_var(var_name16, &guid, verbose);
}
}
free(var_name16);
if (!match && argc == 1) {
printf("Error: \"%s\" not defined\n", argv[0]);
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
/**
* do_env_print_efi() - show information about UEFI variables
*
* @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 print -e" or "printenv -e" command:
* => env print -e [-n] [-guid <guid> | -all] [var [...]]
* If one or more variable names are specified, show information
* named UEFI variables, otherwise show all the UEFI variables.
*/
int do_env_print_efi(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
const efi_guid_t *guid_p = NULL;
efi_guid_t guid;
bool verbose = true;
efi_status_t ret;
/* 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;
}
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))
return CMD_RET_USAGE;
guid_p = (const efi_guid_t *)guid.b;
} else if (!strcmp(argv[0], "-n")) {
verbose = false;
} else {
return CMD_RET_USAGE;
}
}
/* enumerate and show all UEFI variables */
return efi_dump_var_all(argc, argv, guid_p, verbose);
}
/**
* append_value() - encode UEFI variable's value
* @bufp: Buffer of encoded UEFI variable's value
* @sizep: Size of buffer
* @data: data to be encoded into the value
* 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", 3)) { /* 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][-at][-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(struct cmd_tbl *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;
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)) {
return CMD_RET_USAGE;
}
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], "-at")) {
attributes |=
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
} 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 = hextoul(argv[0], &ep);
if (*ep != ':')
return CMD_RET_USAGE;
/* 0 should be allowed for delete */
size = hextoul(++ep, NULL);
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) {
if (!strcmp(var_name, "db") || !strcmp(var_name, "dbx") ||
!strcmp(var_name, "dbt"))
guid = efi_guid_image_security_database;
else
guid = efi_global_variable_guid;
}
if (verbose) {
printf("GUID: %pUl (%pUs)\n", &guid, &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);
}
var_name16 = efi_convert_string(var_name);
if (!var_name16) {
printf("## Out of memory\n");
ret = CMD_RET_FAILURE;
goto out;
}
ret = efi_set_variable_int(var_name16, &guid, attributes, size, value,
true);
free(var_name16);
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);
return ret;
}
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