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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* fs/partitions/fit.c
* Copyright (C) 2021 Daniel Golle
*
* headers extracted from U-Boot mkimage sources
* (C) Copyright 2008 Semihalf
* (C) Copyright 2000-2005
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* based on existing partition parsers
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#define pr_fmt(fmt) fmt
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include "check.h"
#define FIT_IMAGES_PATH "/images"
#define FIT_CONFS_PATH "/configurations"
/* hash/signature/key node */
#define FIT_HASH_NODENAME "hash"
#define FIT_ALGO_PROP "algo"
#define FIT_VALUE_PROP "value"
#define FIT_IGNORE_PROP "uboot-ignore"
#define FIT_SIG_NODENAME "signature"
#define FIT_KEY_REQUIRED "required"
#define FIT_KEY_HINT "key-name-hint"
/* cipher node */
#define FIT_CIPHER_NODENAME "cipher"
#define FIT_ALGO_PROP "algo"
/* image node */
#define FIT_DATA_PROP "data"
#define FIT_DATA_POSITION_PROP "data-position"
#define FIT_DATA_OFFSET_PROP "data-offset"
#define FIT_DATA_SIZE_PROP "data-size"
#define FIT_TIMESTAMP_PROP "timestamp"
#define FIT_DESC_PROP "description"
#define FIT_ARCH_PROP "arch"
#define FIT_TYPE_PROP "type"
#define FIT_OS_PROP "os"
#define FIT_COMP_PROP "compression"
#define FIT_ENTRY_PROP "entry"
#define FIT_LOAD_PROP "load"
/* configuration node */
#define FIT_KERNEL_PROP "kernel"
#define FIT_FILESYSTEM_PROP "filesystem"
#define FIT_RAMDISK_PROP "ramdisk"
#define FIT_FDT_PROP "fdt"
#define FIT_LOADABLE_PROP "loadables"
#define FIT_DEFAULT_PROP "default"
#define FIT_SETUP_PROP "setup"
#define FIT_FPGA_PROP "fpga"
#define FIT_FIRMWARE_PROP "firmware"
#define FIT_STANDALONE_PROP "standalone"
#define FIT_MAX_HASH_LEN HASH_MAX_DIGEST_SIZE
#define MIN_FREE_SECT 16
#define REMAIN_VOLNAME "rootfs_data"
int parse_fit_partitions(struct parsed_partitions *state, u64 fit_start_sector, u64 sectors, int *slot, int add_remain)
{
struct address_space *mapping = state->bdev->bd_inode->i_mapping;
struct page *page;
void *fit, *init_fit;
struct partition_meta_info *info;
char tmp[sizeof(info->volname)];
u64 dsize, dsectors, imgmaxsect = 0;
u32 size, image_pos, image_len;
const u32 *image_offset_be, *image_len_be, *image_pos_be;
int ret = 1, node, images, config;
const char *image_name, *image_type, *image_description, *config_default,
*config_description, *config_loadables;
int image_name_len, image_type_len, image_description_len, config_default_len,
config_description_len, config_loadables_len;
sector_t start_sect, nr_sects;
size_t label_min;
if (fit_start_sector % (1<<(PAGE_SHIFT - SECTOR_SHIFT)))
return -ERANGE;
page = read_mapping_page(mapping, fit_start_sector >> (PAGE_SHIFT - SECTOR_SHIFT), NULL);
if (IS_ERR(page))
return -EFAULT;
if (PageError(page))
return -EFAULT;
init_fit = page_address(page);
if (!init_fit) {
put_page(page);
return -EFAULT;
}
if (fdt_check_header(init_fit)) {
put_page(page);
return 0;
}
dsectors = get_capacity(state->bdev->bd_disk);
if (sectors)
dsectors = (dsectors>sectors)?sectors:dsectors;
dsize = dsectors << SECTOR_SHIFT;
size = fdt_totalsize(init_fit);
/* silently skip non-external-data legacy FIT images */
if (size > PAGE_SIZE) {
put_page(page);
return 0;
}
if (size >= dsize) {
state->access_beyond_eod = 1;
put_page(page);
return -EFBIG;
}
fit = kmemdup(init_fit, size, GFP_KERNEL);
put_page(page);
if (!fit)
return -ENOMEM;
config = fdt_path_offset(fit, FIT_CONFS_PATH);
if (config < 0) {
printk(KERN_ERR "FIT: Cannot find %s node: %d\n", FIT_CONFS_PATH, images);
ret = -ENOENT;
goto ret_out;
}
config_default = fdt_getprop(fit, config, FIT_DEFAULT_PROP, &config_default_len);
if (!config_default) {
printk(KERN_ERR "FIT: Cannot find default configuration\n");
ret = -ENOENT;
goto ret_out;
}
node = fdt_subnode_offset(fit, config, config_default);
if (node < 0) {
printk(KERN_ERR "FIT: Cannot find %s node: %d\n", config_default, node);
ret = -ENOENT;
goto ret_out;
}
config_description = fdt_getprop(fit, node, FIT_DESC_PROP, &config_description_len);
config_loadables = fdt_getprop(fit, node, FIT_LOADABLE_PROP, &config_loadables_len);
printk(KERN_DEBUG "FIT: Default configuration: \"%s\"%s%s%s\n", config_default,
config_description?" (":"", config_description?:"", config_description?")":"");
images = fdt_path_offset(fit, FIT_IMAGES_PATH);
if (images < 0) {
printk(KERN_ERR "FIT: Cannot find %s node: %d\n", FIT_IMAGES_PATH, images);
ret = -EINVAL;
goto ret_out;
}
fdt_for_each_subnode(node, fit, images) {
image_name = fdt_get_name(fit, node, &image_name_len);
image_type = fdt_getprop(fit, node, FIT_TYPE_PROP, &image_type_len);
image_offset_be = fdt_getprop(fit, node, FIT_DATA_OFFSET_PROP, NULL);
image_pos_be = fdt_getprop(fit, node, FIT_DATA_POSITION_PROP, NULL);
image_len_be = fdt_getprop(fit, node, FIT_DATA_SIZE_PROP, NULL);
if (!image_name || !image_type || !image_len_be)
continue;
image_len = be32_to_cpu(*image_len_be);
if (!image_len)
continue;
if (image_offset_be)
image_pos = be32_to_cpu(*image_offset_be) + size;
else if (image_pos_be)
image_pos = be32_to_cpu(*image_pos_be);
else
continue;
image_description = fdt_getprop(fit, node, FIT_DESC_PROP, &image_description_len);
printk(KERN_DEBUG "FIT: %16s sub-image 0x%08x..0x%08x \"%s\" %s%s%s\n",
image_type, image_pos, image_pos + image_len - 1, image_name,
image_description?"(":"", image_description?:"", image_description?") ":"");
if (strcmp(image_type, FIT_FILESYSTEM_PROP))
continue;
if (image_pos & ((1 << PAGE_SHIFT)-1)) {
printk(KERN_ERR "FIT: image %s start not aligned to page boundaries, skipping\n", image_name);
continue;
}
if (image_len & ((1 << PAGE_SHIFT)-1)) {
printk(KERN_ERR "FIT: sub-image %s end not aligned to page boundaries, skipping\n", image_name);
continue;
}
start_sect = image_pos >> SECTOR_SHIFT;
nr_sects = image_len >> SECTOR_SHIFT;
imgmaxsect = (imgmaxsect < (start_sect + nr_sects))?(start_sect + nr_sects):imgmaxsect;
if (start_sect + nr_sects > dsectors) {
state->access_beyond_eod = 1;
continue;
}
put_partition(state, ++(*slot), fit_start_sector + start_sect, nr_sects);
state->parts[*slot].flags = 0;
info = &state->parts[*slot].info;
label_min = min_t(int, sizeof(info->volname) - 1, image_name_len);
strncpy(info->volname, image_name, label_min);
info->volname[label_min] = '\0';
snprintf(tmp, sizeof(tmp), "(%s)", info->volname);
strlcat(state->pp_buf, tmp, PAGE_SIZE);
state->parts[*slot].has_info = true;
state->parts[*slot].flags |= ADDPART_FLAG_READONLY;
if (config_loadables && !strcmp(image_name, config_loadables)) {
printk(KERN_DEBUG "FIT: selecting configured loadable \"%s\" to be root filesystem\n", image_name);
state->parts[*slot].flags |= ADDPART_FLAG_ROOTDEV;
}
}
if (add_remain && (imgmaxsect + MIN_FREE_SECT) < dsectors) {
put_partition(state, ++(*slot), fit_start_sector + imgmaxsect, dsectors - imgmaxsect);
state->parts[*slot].flags = 0;
info = &state->parts[*slot].info;
strcpy(info->volname, REMAIN_VOLNAME);
snprintf(tmp, sizeof(tmp), "(%s)", REMAIN_VOLNAME);
strlcat(state->pp_buf, tmp, PAGE_SIZE);
}
ret_out:
kfree(fit);
return ret;
}
int fit_partition(struct parsed_partitions *state) {
int slot = 0;
return parse_fit_partitions(state, 0, 0, &slot, 0);
}
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