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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* The utility functions for firmware updater.
*/
#include <libflashrom.h>
#include "2common.h"
#include "crossystem.h"
#include "host_misc.h"
#include "util_misc.h"
#include "updater.h"
#define FLASHROM_OUTPUT_WP_PATTERN "write protect is "
/* System environment values. */
static const char * const FLASHROM_OUTPUT_WP_ENABLED =
FLASHROM_OUTPUT_WP_PATTERN "enabled",
* const FLASHROM_OUTPUT_WP_DISABLED =
FLASHROM_OUTPUT_WP_PATTERN "disabled";
// global to allow verbosity level to be injected into callback.
static enum flashrom_log_level g_verbose_screen = FLASHROM_MSG_INFO;
static int flashrom_print_cb(enum flashrom_log_level level, const char *fmt,
va_list ap)
{
int ret = 0;
FILE *output_type = (level < FLASHROM_MSG_INFO) ? stderr : stdout;
if (level > g_verbose_screen)
return ret;
ret = vfprintf(output_type, fmt, ap);
/* msg_*spew often happens inside chip accessors
* in possibly time-critical operations.
* Don't slow them down by flushing.
*/
if (level != FLASHROM_MSG_SPEW)
fflush(output_type);
return ret;
}
static char *flashrom_extract_params(const char *str, char **prog, char **params)
{
char *tmp = strdup(str);
*prog = strtok(tmp, ":");
*params = strtok(NULL, "");
return tmp;
}
int flashrom_read_image(struct firmware_image *image, const char *region,
int verbosity)
{
int r = 0;
size_t len = 0;
g_verbose_screen = verbosity;
char *programmer, *params;
char *tmp = flashrom_extract_params(image->programmer, &programmer, ¶ms);
struct flashrom_programmer *prog = NULL;
struct flashrom_flashctx *flashctx = NULL;
struct flashrom_layout *layout = NULL;
flashrom_set_log_callback((flashrom_log_callback *)&flashrom_print_cb);
r |= flashrom_init(1);
r |= flashrom_programmer_init(&prog, programmer, params);
r |= flashrom_flash_probe(&flashctx, prog, NULL);
len = flashrom_flash_getsize(flashctx);
if (region) {
r = flashrom_layout_read_fmap_from_buffer(
&layout, flashctx, (const uint8_t *)image->data,
image->size);
if (r > 0) {
WARN("could not read fmap from image, r=%d, "
"falling back to read from rom\n", r);
r = flashrom_layout_read_fmap_from_rom(
&layout, flashctx, 0, len);
if (r > 0) {
ERROR("could not read fmap from rom, r=%d\n", r);
r = -1;
goto err_cleanup;
}
}
// empty region causes seg fault in API.
r |= flashrom_layout_include_region(layout, region);
if (r > 0) {
ERROR("could not include region = '%s'\n", region);
r = -1;
goto err_cleanup;
}
flashrom_layout_set(flashctx, layout);
}
image->data = calloc(1, len);
image->size = len;
image->file_name = strdup("<none>");
r |= flashrom_image_read(flashctx, image->data, len);
err_cleanup:
r |= flashrom_programmer_shutdown(prog);
flashrom_layout_release(layout);
flashrom_flash_release(flashctx);
free(tmp);
return r;
}
int flashrom_write_image(const struct firmware_image *image,
const char *region,
const struct firmware_image *diff_image,
int verbosity)
{
int r = 0;
size_t len = 0;
g_verbose_screen = verbosity;
char *programmer, *params;
char *tmp = flashrom_extract_params(image->programmer, &programmer, ¶ms);
struct flashrom_programmer *prog = NULL;
struct flashrom_flashctx *flashctx = NULL;
struct flashrom_layout *layout = NULL;
flashrom_set_log_callback((flashrom_log_callback *)&flashrom_print_cb);
r |= flashrom_init(1);
r |= flashrom_programmer_init(&prog, programmer, params);
r |= flashrom_flash_probe(&flashctx, prog, NULL);
len = flashrom_flash_getsize(flashctx);
if (len == 0) {
ERROR("zero sized flash detected\n");
r = -1;
goto err_cleanup;
}
if (diff_image) {
if (diff_image->size != image->size) {
ERROR("diff_image->size != image->size");
r = -1;
goto err_cleanup;
}
}
if (region) {
r = flashrom_layout_read_fmap_from_buffer(
&layout, flashctx, (const uint8_t *)image->data,
image->size);
if (r > 0) {
WARN("could not read fmap from image, r=%d, "
"falling back to read from rom\n", r);
r = flashrom_layout_read_fmap_from_rom(
&layout, flashctx, 0, len);
if (r > 0) {
ERROR("could not read fmap from rom, r=%d\n", r);
r = -1;
goto err_cleanup;
}
}
// empty region causes seg fault in API.
r |= flashrom_layout_include_region(layout, region);
if (r > 0) {
ERROR("could not include region = '%s'\n", region);
r = -1;
goto err_cleanup;
}
flashrom_layout_set(flashctx, layout);
}
flashrom_flag_set(flashctx, FLASHROM_FLAG_VERIFY_WHOLE_CHIP, true);
flashrom_flag_set(flashctx, FLASHROM_FLAG_VERIFY_AFTER_WRITE, true);
if (diff_image) /* equiv --noverify --flash-contents=diff_image at cli */
flashrom_flag_set(flashctx, FLASHROM_FLAG_VERIFY_AFTER_WRITE, false);
r |= flashrom_image_write(flashctx, image->data, image->size,
diff_image ? diff_image->data : NULL);
err_cleanup:
r |= flashrom_programmer_shutdown(prog);
flashrom_layout_release(layout);
flashrom_flash_release(flashctx);
free(tmp);
return r;
}
/* Helper function to return write protection status via given programmer. */
enum wp_state flashrom_get_wp(const char *programmer)
{
char *command, *result;
const char *postfix;
int r;
/* grep is needed because host_shell only returns 1 line. */
postfix = " 2>/dev/null | grep \"" FLASHROM_OUTPUT_WP_PATTERN "\"";
/* TODO(b/203715651): link with flashrom directly. */
ASPRINTF(&command, "flashrom --wp-status -p %s %s", programmer, postfix);
/* invokes flashrom(8) with non-zero result if error. */
result = host_shell(command);
strip_string(result, NULL);
free(command);
VB2_DEBUG("wp-status: %s\n", result);
if (strstr(result, FLASHROM_OUTPUT_WP_ENABLED))
r = WP_ENABLED;
else if (strstr(result, FLASHROM_OUTPUT_WP_DISABLED))
r = WP_DISABLED;
else
r = WP_ERROR;
free(result);
return r;
}
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