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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 static struct image_type_params fitimage_params = {
166 .name = "FIT Image support",
167 .header_size = sizeof(image_header_t),
168 .hdr = (void*)&header,
169 .verify_header = fit_verify_header,
170 .print_header = fit_print_contents,
171 .check_image_type = fit_check_image_types,
172 .fflag_handle = fit_handle_file,
173 .set_header = NULL, /* FIT images use DTB header */
174 .check_params = fit_check_params,
175 };
176
177 void init_fit_image_type (void)
178 {
179 register_image_type(&fitimage_params);
180 }