target/linux/generic/files/block/partitions/fit.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  fs/partitions/fit.c
   4  *  Copyright (C) 2021  Daniel Golle
   5  *
   6  *  headers extracted from U-Boot mkimage sources
   7  *  (C) Copyright 2008 Semihalf
   8  *  (C) Copyright 2000-2005
   9  *  Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  10  *
  11  *  based on existing partition parsers
  12  *  Copyright (C) 1991-1998  Linus Torvalds
  13  *  Re-organised Feb 1998 Russell King
  14  */
  15
  16 #define pr_fmt(fmt) fmt
  17
  18 #include <linux/types.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_fdt.h>
  22 #include <linux/libfdt.h>
  23
  24 #include "check.h"
  25
  26 #define FIT_IMAGES_PATH         "/images"
  27 #define FIT_CONFS_PATH          "/configurations"
  28
  29 /* hash/signature/key node */
  30 #define FIT_HASH_NODENAME       "hash"
  31 #define FIT_ALGO_PROP           "algo"
  32 #define FIT_VALUE_PROP          "value"
  33 #define FIT_IGNORE_PROP         "uboot-ignore"
  34 #define FIT_SIG_NODENAME        "signature"
  35 #define FIT_KEY_REQUIRED        "required"
  36 #define FIT_KEY_HINT            "key-name-hint"
  37
  38 /* cipher node */
  39 #define FIT_CIPHER_NODENAME     "cipher"
  40 #define FIT_ALGO_PROP           "algo"
  41
  42 /* image node */
  43 #define FIT_DATA_PROP           "data"
  44 #define FIT_DATA_POSITION_PROP  "data-position"
  45 #define FIT_DATA_OFFSET_PROP    "data-offset"
  46 #define FIT_DATA_SIZE_PROP      "data-size"
  47 #define FIT_TIMESTAMP_PROP      "timestamp"
  48 #define FIT_DESC_PROP           "description"
  49 #define FIT_ARCH_PROP           "arch"
  50 #define FIT_TYPE_PROP           "type"
  51 #define FIT_OS_PROP             "os"
  52 #define FIT_COMP_PROP           "compression"
  53 #define FIT_ENTRY_PROP          "entry"
  54 #define FIT_LOAD_PROP           "load"
  55
  56 /* configuration node */
  57 #define FIT_KERNEL_PROP         "kernel"
  58 #define FIT_FILESYSTEM_PROP     "filesystem"
  59 #define FIT_RAMDISK_PROP        "ramdisk"
  60 #define FIT_FDT_PROP            "fdt"
  61 #define FIT_LOADABLE_PROP       "loadables"
  62 #define FIT_DEFAULT_PROP        "default"
  63 #define FIT_SETUP_PROP          "setup"
  64 #define FIT_FPGA_PROP           "fpga"
  65 #define FIT_FIRMWARE_PROP       "firmware"
  66 #define FIT_STANDALONE_PROP     "standalone"
  67
  68 #define FIT_MAX_HASH_LEN        HASH_MAX_DIGEST_SIZE
  69
  70 #define MIN_FREE_SECT           16
  71 #define REMAIN_VOLNAME          "rootfs_data"
  72
  73 int parse_fit_partitions(struct parsed_partitions *state, u64 fit_start_sector, u64 sectors, int *slot, int add_remain)
  74 {
  75         struct address_space *mapping = state->bdev->bd_inode->i_mapping;
  76         struct page *page;
  77         void *fit, *init_fit;
  78         struct partition_meta_info *info;
  79         char tmp[sizeof(info->volname)];
  80         u64 dsize, dsectors, imgmaxsect = 0;
  81         u32 size, image_pos, image_len;
  82         const u32 *image_offset_be, *image_len_be, *image_pos_be;
  83         int ret = 1, node, images, config;
  84         const char *image_name, *image_type, *image_description, *config_default,
  85                 *config_description, *config_loadables;
  86         int image_name_len, image_type_len, image_description_len, config_default_len,
  87                 config_description_len, config_loadables_len;
  88         sector_t start_sect, nr_sects;
  89         size_t label_min;
  90
  91         if (fit_start_sector % (1<<(PAGE_SHIFT - SECTOR_SHIFT)))
  92                 return -ERANGE;
  93
  94         page = read_mapping_page(mapping, fit_start_sector >> (PAGE_SHIFT - SECTOR_SHIFT), NULL);
  95         if (!page)
  96                 return -ENOMEM;
  97
  98         init_fit = page_address(page);
  99
 100         if (!init_fit) {
 101                 put_page(page);
 102                 return -EFAULT;
 103         }
 104
 105         if (fdt_check_header(init_fit)) {
 106                 put_page(page);
 107                 return 0;
 108         }
 109
 110         dsectors = get_capacity(state->bdev->bd_disk);
 111         if (sectors)
 112                 dsectors = (dsectors>sectors)?sectors:dsectors;
 113
 114         dsize = dsectors << SECTOR_SHIFT;
 115
 116         size = fdt_totalsize(init_fit);
 117
 118         /* silently skip non-external-data legacy FIT images */
 119         if (size > PAGE_SIZE) {
 120                 put_page(page);
 121                 return 0;
 122         }
 123
 124         if (size >= dsize) {
 125                 state->access_beyond_eod = 1;
 126                 put_page(page);
 127                 return -EFBIG;
 128         }
 129
 130         fit = kmemdup(init_fit, size, GFP_KERNEL);
 131         put_page(page);
 132         if (!fit)
 133                 return -ENOMEM;
 134
 135         config = fdt_path_offset(fit, FIT_CONFS_PATH);
 136         if (config < 0) {
 137                 printk(KERN_ERR "FIT: Cannot find %s node: %d\n", FIT_CONFS_PATH, images);
 138                 ret = -ENOENT;
 139                 goto ret_out;
 140         }
 141
 142         config_default = fdt_getprop(fit, config, FIT_DEFAULT_PROP, &config_default_len);
 143
 144         if (!config_default) {
 145                 printk(KERN_ERR "FIT: Cannot find default configuration\n");
 146                 ret = -ENOENT;
 147                 goto ret_out;
 148         }
 149
 150         node = fdt_subnode_offset(fit, config, config_default);
 151         if (node < 0) {
 152                 printk(KERN_ERR "FIT: Cannot find %s node: %d\n", config_default, node);
 153                 ret = -ENOENT;
 154                 goto ret_out;
 155         }
 156
 157         config_description = fdt_getprop(fit, node, FIT_DESC_PROP, &config_description_len);
 158         config_loadables = fdt_getprop(fit, node, FIT_LOADABLE_PROP, &config_loadables_len);
 159
 160         printk(KERN_DEBUG "FIT: Default configuration: \"%s\"%s%s%s\n", config_default,
 161                 config_description?" (":"", config_description?:"", config_description?")":"");
 162
 163         images = fdt_path_offset(fit, FIT_IMAGES_PATH);
 164         if (images < 0) {
 165                 printk(KERN_ERR "FIT: Cannot find %s node: %d\n", FIT_IMAGES_PATH, images);
 166                 ret = -EINVAL;
 167                 goto ret_out;
 168         }
 169
 170         fdt_for_each_subnode(node, fit, images) {
 171                 image_name = fdt_get_name(fit, node, &image_name_len);
 172                 image_type = fdt_getprop(fit, node, FIT_TYPE_PROP, &image_type_len);
 173                 image_offset_be = fdt_getprop(fit, node, FIT_DATA_OFFSET_PROP, NULL);
 174                 image_pos_be = fdt_getprop(fit, node, FIT_DATA_POSITION_PROP, NULL);
 175                 image_len_be = fdt_getprop(fit, node, FIT_DATA_SIZE_PROP, NULL);
 176                 if (!image_name || !image_type || !image_len_be)
 177                         continue;
 178
 179                 image_len = be32_to_cpu(*image_len_be);
 180                 if (!image_len)
 181                         continue;
 182
 183                 if (image_offset_be)
 184                         image_pos = be32_to_cpu(*image_offset_be) + size;
 185                 else if (image_pos_be)
 186                         image_pos = be32_to_cpu(*image_pos_be);
 187                 else
 188                         continue;
 189
 190                 image_description = fdt_getprop(fit, node, FIT_DESC_PROP, &image_description_len);
 191
 192                 printk(KERN_DEBUG "FIT: %16s sub-image 0x%08x..0x%08x \"%s\" %s%s%s\n",
 193                         image_type, image_pos, image_pos + image_len - 1, image_name,
 194                         image_description?"(":"", image_description?:"", image_description?") ":"");
 195
 196                 if (strcmp(image_type, FIT_FILESYSTEM_PROP))
 197                         continue;
 198
 199                 if (image_pos & ((1 << PAGE_SHIFT)-1)) {
 200                         printk(KERN_ERR "FIT: image %s start not aligned to page boundaries, skipping\n", image_name);
 201                         continue;
 202                 }
 203
 204                 if (image_len & ((1 << PAGE_SHIFT)-1)) {
 205                         printk(KERN_ERR "FIT: sub-image %s end not aligned to page boundaries, skipping\n", image_name);
 206                         continue;
 207                 }
 208
 209                 start_sect = image_pos >> SECTOR_SHIFT;
 210                 nr_sects = image_len >> SECTOR_SHIFT;
 211                 imgmaxsect = (imgmaxsect < (start_sect + nr_sects))?(start_sect + nr_sects):imgmaxsect;
 212
 213                 if (start_sect + nr_sects > dsectors) {
 214                         state->access_beyond_eod = 1;
 215                         continue;
 216                 }
 217
 218                 put_partition(state, ++(*slot), fit_start_sector + start_sect, nr_sects);
 219                 state->parts[*slot].flags = 0;
 220                 info = &state->parts[*slot].info;
 221
 222                 label_min = min_t(int, sizeof(info->volname) - 1, image_name_len);
 223                 strncpy(info->volname, image_name, label_min);
 224                 info->volname[label_min] = '\0';
 225
 226                 snprintf(tmp, sizeof(tmp), "(%s)", info->volname);
 227                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
 228
 229                 state->parts[*slot].has_info = true;
 230
 231                 if (config_loadables && !strcmp(image_name, config_loadables)) {
 232                         printk(KERN_DEBUG "FIT: selecting configured loadable \"%s\" to be root filesystem\n", image_name);
 233                         state->parts[*slot].flags |= ADDPART_FLAG_ROOTDEV;
 234                 }
 235         }
 236
 237         if (add_remain && (imgmaxsect + MIN_FREE_SECT) < dsectors) {
 238                 put_partition(state, ++(*slot), fit_start_sector + imgmaxsect, dsectors - imgmaxsect);
 239                 state->parts[*slot].flags = 0;
 240                 info = &state->parts[*slot].info;
 241                 strcpy(info->volname, REMAIN_VOLNAME);
 242                 snprintf(tmp, sizeof(tmp), "(%s)", REMAIN_VOLNAME);
 243                 strlcat(state->pp_buf, tmp, PAGE_SIZE);
 244         }
 245 ret_out:
 246         kfree(fit);
 247         return ret;
 248 }
 249
 250 int fit_partition(struct parsed_partitions *state) {
 251         int slot = 0;
 252         return parse_fit_partitions(state, 0, 0, &slot, 0);
 253 }