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u-boot-brain/tools/mkeficapsule.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2018 Linaro Limited
* Author: AKASHI Takahiro
*/
#include <errno.h>
#include <getopt.h>
#include <malloc.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "fdt_host.h"
typedef __u8 u8;
typedef __u16 u16;
typedef __u32 u32;
typedef __u64 u64;
typedef __s16 s16;
typedef __s32 s32;
#define aligned_u64 __aligned_u64
#define SIGNATURE_NODENAME "signature"
#define OVERLAY_NODENAME "__overlay__"
#ifndef __packed
#define __packed __attribute__((packed))
#endif
#include <efi.h>
#include <efi_api.h>
static const char *tool_name = "mkeficapsule";
efi_guid_t efi_guid_fm_capsule = EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
efi_guid_t efi_guid_image_type_uboot_fit =
EFI_FIRMWARE_IMAGE_TYPE_UBOOT_FIT_GUID;
efi_guid_t efi_guid_image_type_uboot_raw =
EFI_FIRMWARE_IMAGE_TYPE_UBOOT_RAW_GUID;
static struct option options[] = {
{"fit", required_argument, NULL, 'f'},
{"raw", required_argument, NULL, 'r'},
{"index", required_argument, NULL, 'i'},
{"instance", required_argument, NULL, 'I'},
{"dtb", required_argument, NULL, 'D'},
{"public key", required_argument, NULL, 'K'},
{"overlay", no_argument, NULL, 'O'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0},
};
static void print_usage(void)
{
printf("Usage: %s [options] <output file>\n"
"Options:\n"
"\t-f, --fit <fit image> new FIT image file\n"
"\t-r, --raw <raw image> new raw image file\n"
"\t-i, --index <index> update image index\n"
"\t-I, --instance <instance> update hardware instance\n"
"\t-K, --public-key <key file> public key esl file\n"
"\t-D, --dtb <dtb file> dtb file\n"
"\t-O, --overlay the dtb file is an overlay\n"
"\t-h, --help print a help message\n",
tool_name);
}
static int fdt_add_pub_key_data(void *sptr, void *dptr, size_t key_size,
bool overlay)
{
int parent;
int ov_node;
int frag_node;
int ret = 0;
if (overlay) {
/*
* The signature would be stored in the
* first fragment node of the overlay
*/
frag_node = fdt_first_subnode(dptr, 0);
if (frag_node == -FDT_ERR_NOTFOUND) {
fprintf(stderr,
"Couldn't find the fragment node: %s\n",
fdt_strerror(frag_node));
goto done;
}
ov_node = fdt_subnode_offset(dptr, frag_node, OVERLAY_NODENAME);
if (ov_node == -FDT_ERR_NOTFOUND) {
fprintf(stderr,
"Couldn't find the __overlay__ node: %s\n",
fdt_strerror(ov_node));
goto done;
}
} else {
ov_node = 0;
}
parent = fdt_subnode_offset(dptr, ov_node, SIGNATURE_NODENAME);
if (parent == -FDT_ERR_NOTFOUND) {
parent = fdt_add_subnode(dptr, ov_node, SIGNATURE_NODENAME);
if (parent < 0) {
ret = parent;
if (ret != -FDT_ERR_NOSPACE) {
fprintf(stderr,
"Couldn't create signature node: %s\n",
fdt_strerror(parent));
}
}
}
if (ret)
goto done;
/* Write the key to the FDT node */
ret = fdt_setprop(dptr, parent, "capsule-key",
sptr, key_size);
done:
if (ret)
ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
return ret;
}
static int add_public_key(const char *pkey_file, const char *dtb_file,
bool overlay)
{
int ret;
int srcfd = -1;
int destfd = -1;
void *sptr = NULL;
void *dptr = NULL;
off_t src_size;
struct stat pub_key;
struct stat dtb;
/* Find out the size of the public key */
srcfd = open(pkey_file, O_RDONLY);
if (srcfd == -1) {
fprintf(stderr, "%s: Can't open %s: %s\n",
__func__, pkey_file, strerror(errno));
ret = -1;
goto err;
}
ret = fstat(srcfd, &pub_key);
if (ret == -1) {
fprintf(stderr, "%s: Can't stat %s: %s\n",
__func__, pkey_file, strerror(errno));
ret = -1;
goto err;
}
src_size = pub_key.st_size;
/* mmap the public key esl file */
sptr = mmap(0, src_size, PROT_READ, MAP_SHARED, srcfd, 0);
if (sptr == MAP_FAILED) {
fprintf(stderr, "%s: Failed to mmap %s:%s\n",
__func__, pkey_file, strerror(errno));
ret = -1;
goto err;
}
/* Open the dest FDT */
destfd = open(dtb_file, O_RDWR);
if (destfd == -1) {
fprintf(stderr, "%s: Can't open %s: %s\n",
__func__, dtb_file, strerror(errno));
ret = -1;
goto err;
}
ret = fstat(destfd, &dtb);
if (ret == -1) {
fprintf(stderr, "%s: Can't stat %s: %s\n",
__func__, dtb_file, strerror(errno));
goto err;
}
dtb.st_size += src_size + 0x30;
if (ftruncate(destfd, dtb.st_size)) {
fprintf(stderr, "%s: Can't expand %s: %s\n",
__func__, dtb_file, strerror(errno));
ret = -1;
goto err;
}
errno = 0;
/* mmap the dtb file */
dptr = mmap(0, dtb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
destfd, 0);
if (dptr == MAP_FAILED) {
fprintf(stderr, "%s: Failed to mmap %s:%s\n",
__func__, dtb_file, strerror(errno));
ret = -1;
goto err;
}
if (fdt_check_header(dptr)) {
fprintf(stderr, "%s: Invalid FDT header\n", __func__);
ret = -1;
goto err;
}
ret = fdt_open_into(dptr, dptr, dtb.st_size);
if (ret) {
fprintf(stderr, "%s: Cannot expand FDT: %s\n",
__func__, fdt_strerror(ret));
ret = -1;
goto err;
}
/* Copy the esl file to the expanded FDT */
ret = fdt_add_pub_key_data(sptr, dptr, src_size, overlay);
if (ret < 0) {
fprintf(stderr, "%s: Unable to add public key to the FDT\n",
__func__);
ret = -1;
goto err;
}
ret = 0;
err:
if (sptr)
munmap(sptr, src_size);
if (dptr)
munmap(dptr, dtb.st_size);
if (srcfd != -1)
close(srcfd);
if (destfd != -1)
close(destfd);
return ret;
}
static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
unsigned long index, unsigned long instance)
{
struct efi_capsule_header header;
struct efi_firmware_management_capsule_header capsule;
struct efi_firmware_management_capsule_image_header image;
FILE *f, *g;
struct stat bin_stat;
u8 *data;
size_t size;
u64 offset;
#ifdef DEBUG
printf("For output: %s\n", path);
printf("\tbin: %s\n\ttype: %pUl\n", bin, guid);
printf("\tindex: %ld\n\tinstance: %ld\n", index, instance);
#endif
g = fopen(bin, "r");
if (!g) {
printf("cannot open %s\n", bin);
return -1;
}
if (stat(bin, &bin_stat) < 0) {
printf("cannot determine the size of %s\n", bin);
goto err_1;
}
data = malloc(bin_stat.st_size);
if (!data) {
printf("cannot allocate memory: %zx\n", (size_t)bin_stat.st_size);
goto err_1;
}
f = fopen(path, "w");
if (!f) {
printf("cannot open %s\n", path);
goto err_2;
}
header.capsule_guid = efi_guid_fm_capsule;
header.header_size = sizeof(header);
/* TODO: The current implementation ignores flags */
header.flags = CAPSULE_FLAGS_PERSIST_ACROSS_RESET;
header.capsule_image_size = sizeof(header)
+ sizeof(capsule) + sizeof(u64)
+ sizeof(image)
+ bin_stat.st_size;
size = fwrite(&header, 1, sizeof(header), f);
if (size < sizeof(header)) {
printf("write failed (%zx)\n", size);
goto err_3;
}
capsule.version = 0x00000001;
capsule.embedded_driver_count = 0;
capsule.payload_item_count = 1;
size = fwrite(&capsule, 1, sizeof(capsule), f);
if (size < (sizeof(capsule))) {
printf("write failed (%zx)\n", size);
goto err_3;
}
offset = sizeof(capsule) + sizeof(u64);
size = fwrite(&offset, 1, sizeof(offset), f);
if (size < sizeof(offset)) {
printf("write failed (%zx)\n", size);
goto err_3;
}
image.version = 0x00000003;
memcpy(&image.update_image_type_id, guid, sizeof(*guid));
image.update_image_index = index;
image.reserved[0] = 0;
image.reserved[1] = 0;
image.reserved[2] = 0;
image.update_image_size = bin_stat.st_size;
image.update_vendor_code_size = 0; /* none */
image.update_hardware_instance = instance;
image.image_capsule_support = 0;
size = fwrite(&image, 1, sizeof(image), f);
if (size < sizeof(image)) {
printf("write failed (%zx)\n", size);
goto err_3;
}
size = fread(data, 1, bin_stat.st_size, g);
if (size < bin_stat.st_size) {
printf("read failed (%zx)\n", size);
goto err_3;
}
size = fwrite(data, 1, bin_stat.st_size, f);
if (size < bin_stat.st_size) {
printf("write failed (%zx)\n", size);
goto err_3;
}
fclose(f);
fclose(g);
free(data);
return 0;
err_3:
fclose(f);
err_2:
free(data);
err_1:
fclose(g);
return -1;
}
/*
* Usage:
* $ mkeficapsule -f <firmware binary> <output file>
*/
int main(int argc, char **argv)
{
char *file;
char *pkey_file;
char *dtb_file;
efi_guid_t *guid;
unsigned long index, instance;
int c, idx;
int ret;
bool overlay = false;
file = NULL;
pkey_file = NULL;
dtb_file = NULL;
guid = NULL;
index = 0;
instance = 0;
for (;;) {
c = getopt_long(argc, argv, "f:r:i:I:v:D:K:Oh", options, &idx);
if (c == -1)
break;
switch (c) {
case 'f':
if (file) {
printf("Image already specified\n");
return -1;
}
file = optarg;
guid = &efi_guid_image_type_uboot_fit;
break;
case 'r':
if (file) {
printf("Image already specified\n");
return -1;
}
file = optarg;
guid = &efi_guid_image_type_uboot_raw;
break;
case 'i':
index = strtoul(optarg, NULL, 0);
break;
case 'I':
instance = strtoul(optarg, NULL, 0);
break;
case 'K':
if (pkey_file) {
printf("Public Key already specified\n");
return -1;
}
pkey_file = optarg;
break;
case 'D':
if (dtb_file) {
printf("DTB file already specified\n");
return -1;
}
dtb_file = optarg;
break;
case 'O':
overlay = true;
break;
case 'h':
print_usage();
return 0;
}
}
/* need a fit image file or raw image file */
if (!file && !pkey_file && !dtb_file) {
print_usage();
exit(EXIT_FAILURE);
}
if (pkey_file && dtb_file) {
ret = add_public_key(pkey_file, dtb_file, overlay);
if (ret == -1) {
printf("Adding public key to the dtb failed\n");
exit(EXIT_FAILURE);
} else {
exit(EXIT_SUCCESS);
}
}
if (create_fwbin(argv[optind], file, guid, index, instance)
< 0) {
printf("Creating firmware capsule failed\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
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