tools/fit_image.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2004
   5  * DENX Software Engineering
   6  * Wolfgang Denk, wd@denx.de
   7  *
   8  * Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
   9  *              FIT image specific code abstracted from mkimage.c
  10  *              some functions added to address abstraction
  11  *
  12  * All rights reserved.
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include "imagetool.h"
  18 #include "fit_common.h"
  19 #include "mkimage.h"
  20 #include <image.h>
  21 #include <u-boot/crc.h>
  22
  23 static image_header_t header;
  24
  25 static int fit_add_file_data(struct image_tool_params *params, size_t size_inc,
  26                              const char *tmpfile)
  27 {
  28         int tfd, destfd = 0;
  29         void *dest_blob = NULL;
  30         off_t destfd_size = 0;
  31         struct stat sbuf;
  32         void *ptr;
  33         int ret = 0;
  34
  35         tfd = mmap_fdt(params->cmdname, tmpfile, size_inc, &ptr, &sbuf, true);
  36         if (tfd < 0)
  37                 return -EIO;
  38
  39         if (params->keydest) {
  40                 struct stat dest_sbuf;
  41
  42                 destfd = mmap_fdt(params->cmdname, params->keydest, size_inc,
  43                                   &dest_blob, &dest_sbuf, false);
  44                 if (destfd < 0) {
  45                         ret = -EIO;
  46                         goto err_keydest;
  47                 }
  48                 destfd_size = dest_sbuf.st_size;
  49         }
  50
  51         /* for first image creation, add a timestamp at offset 0 i.e., root  */
  52         if (params->datafile)
  53                 ret = fit_set_timestamp(ptr, 0, sbuf.st_mtime);
  54
  55         if (!ret) {
  56                 ret = fit_add_verification_data(params->keydir, dest_blob, ptr,
  57                                                 params->comment,
  58                                                 params->require_keys);
  59         }
  60
  61         if (dest_blob) {
  62                 munmap(dest_blob, destfd_size);
  63                 close(destfd);
  64         }
  65
  66 err_keydest:
  67         munmap(ptr, sbuf.st_size);
  68         close(tfd);
  69
  70         return ret;
  71 }
  72
  73 /**
  74  * fit_handle_file - main FIT file processing function
  75  *
  76  * fit_handle_file() runs dtc to convert .its to .itb, includes
  77  * binary data, updates timestamp property and calculates hashes.
  78  *
  79  * datafile  - .its file
  80  * imagefile - .itb file
  81  *
  82  * returns:
  83  *     only on success, otherwise calls exit (EXIT_FAILURE);
  84  */
  85 static int fit_handle_file(struct image_tool_params *params)
  86 {
  87         char tmpfile[MKIMAGE_MAX_TMPFILE_LEN];
  88         char cmd[MKIMAGE_MAX_DTC_CMDLINE_LEN];
  89         size_t size_inc;
  90         int ret;
  91
  92         /* Flattened Image Tree (FIT) format  handling */
  93         debug ("FIT format handling\n");
  94
  95         /* call dtc to include binary properties into the tmp file */
  96         if (strlen (params->imagefile) +
  97                 strlen (MKIMAGE_TMPFILE_SUFFIX) + 1 > sizeof (tmpfile)) {
  98                 fprintf (stderr, "%s: Image file name (%s) too long, "
  99                                 "can't create tmpfile",
 100                                 params->imagefile, params->cmdname);
 101                 return (EXIT_FAILURE);
 102         }
 103         sprintf (tmpfile, "%s%s", params->imagefile, MKIMAGE_TMPFILE_SUFFIX);
 104
 105         /* We either compile the source file, or use the existing FIT image */
 106         if (params->datafile) {
 107                 /* dtc -I dts -O dtb -p 500 datafile > tmpfile */
 108                 snprintf(cmd, sizeof(cmd), "%s %s %s > %s",
 109                          MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
 110                 debug("Trying to execute \"%s\"\n", cmd);
 111         } else {
 112                 snprintf(cmd, sizeof(cmd), "cp %s %s",
 113                          params->imagefile, tmpfile);
 114         }
 115         if (system (cmd) == -1) {
 116                 fprintf (stderr, "%s: system(%s) failed: %s\n",
 117                                 params->cmdname, cmd, strerror(errno));
 118                 goto err_system;
 119         }
 120
 121         /*
 122          * Set hashes for images in the blob. Unfortunately we may need more
 123          * space in either FDT, so keep trying until we succeed.
 124          *
 125          * Note: this is pretty inefficient for signing, since we must
 126          * calculate the signature every time. It would be better to calculate
 127          * all the data and then store it in a separate step. However, this
 128          * would be considerably more complex to implement. Generally a few
 129          * steps of this loop is enough to sign with several keys.
 130          */
 131         for (size_inc = 0; size_inc < 64 * 1024; size_inc += 1024) {
 132                 ret = fit_add_file_data(params, size_inc, tmpfile);
 133                 if (!ret || ret != -ENOSPC)
 134                         break;
 135         }
 136
 137         if (ret) {
 138                 fprintf(stderr, "%s Can't add hashes to FIT blob\n",
 139                         params->cmdname);
 140                 goto err_system;
 141         }
 142
 143         if (rename (tmpfile, params->imagefile) == -1) {
 144                 fprintf (stderr, "%s: Can't rename %s to %s: %s\n",
 145                                 params->cmdname, tmpfile, params->imagefile,
 146                                 strerror (errno));
 147                 unlink (tmpfile);
 148                 unlink (params->imagefile);
 149                 return EXIT_FAILURE;
 150         }
 151         return EXIT_SUCCESS;
 152
 153 err_system:
 154         unlink(tmpfile);
 155         return -1;
 156 }
 157
 158 static int fit_check_params(struct image_tool_params *params)
 159 {
 160         return  ((params->dflag && (params->fflag || params->lflag)) ||
 161                 (params->fflag && (params->dflag || params->lflag)) ||
 162                 (params->lflag && (params->dflag || params->fflag)));
 163 }
 164
 165 U_BOOT_IMAGE_TYPE(
 166         fitimage,
 167         "FIT Image support",
 168         sizeof(image_header_t),
 169         (void *)&header,
 170         fit_check_params,
 171         fit_verify_header,
 172         fit_print_contents,
 173         NULL,
 174         NULL,
 175         fit_check_image_types,
 176         fit_handle_file,
 177         NULL /* FIT images use DTB header */
 178 );