summaryrefslogtreecommitdiffstats
path: root/tools/fit_image.c
blob: 3ececf913ff4c4fe2c1c2457f3f5b5ccbfa195fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2004
 * DENX Software Engineering
 * Wolfgang Denk, wd@denx.de
 *
 * Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
 *		FIT image specific code abstracted from mkimage.c
 *		some functions added to address abstraction
 *
 * All rights reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include "imagetool.h"
#include "fit_common.h"
#include "mkimage.h"
#include <image.h>
#include <u-boot/crc.h>

static image_header_t header;

static int fit_add_file_data(struct image_tool_params *params, size_t size_inc,
			     const char *tmpfile)
{
	int tfd, destfd = 0;
	void *dest_blob = NULL;
	off_t destfd_size = 0;
	struct stat sbuf;
	void *ptr;
	int ret = 0;

	tfd = mmap_fdt(params->cmdname, tmpfile, size_inc, &ptr, &sbuf, true);
	if (tfd < 0)
		return -EIO;

	if (params->keydest) {
		struct stat dest_sbuf;

		destfd = mmap_fdt(params->cmdname, params->keydest, size_inc,
				  &dest_blob, &dest_sbuf, false);
		if (destfd < 0) {
			ret = -EIO;
			goto err_keydest;
		}
		destfd_size = dest_sbuf.st_size;
	}

	/* for first image creation, add a timestamp at offset 0 i.e., root  */
	if (params->datafile)
		ret = fit_set_timestamp(ptr, 0, sbuf.st_mtime);

	if (!ret) {
		ret = fit_add_verification_data(params->keydir, dest_blob, ptr,
						params->comment,
						params->require_keys);
	}

	if (dest_blob) {
		munmap(dest_blob, destfd_size);
		close(destfd);
	}

err_keydest:
	munmap(ptr, sbuf.st_size);
	close(tfd);

	return ret;
}

/**
 * fit_handle_file - main FIT file processing function
 *
 * fit_handle_file() runs dtc to convert .its to .itb, includes
 * binary data, updates timestamp property and calculates hashes.
 *
 * datafile  - .its file
 * imagefile - .itb file
 *
 * returns:
 *     only on success, otherwise calls exit (EXIT_FAILURE);
 */
static int fit_handle_file(struct image_tool_params *params)
{
	char tmpfile[MKIMAGE_MAX_TMPFILE_LEN];
	char cmd[MKIMAGE_MAX_DTC_CMDLINE_LEN];
	size_t size_inc;
	int ret;

	/* Flattened Image Tree (FIT) format  handling */
	debug ("FIT format handling\n");

	/* call dtc to include binary properties into the tmp file */
	if (strlen (params->imagefile) +
		strlen (MKIMAGE_TMPFILE_SUFFIX) + 1 > sizeof (tmpfile)) {
		fprintf (stderr, "%s: Image file name (%s) too long, "
				"can't create tmpfile",
				params->imagefile, params->cmdname);
		return (EXIT_FAILURE);
	}
	sprintf (tmpfile, "%s%s", params->imagefile, MKIMAGE_TMPFILE_SUFFIX);

	/* We either compile the source file, or use the existing FIT image */
	if (params->datafile) {
		/* dtc -I dts -O dtb -p 500 datafile > tmpfile */
		snprintf(cmd, sizeof(cmd), "%s %s %s > %s",
			 MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
		debug("Trying to execute \"%s\"\n", cmd);
	} else {
		snprintf(cmd, sizeof(cmd), "cp %s %s",
			 params->imagefile, tmpfile);
	}
	if (system (cmd) == -1) {
		fprintf (stderr, "%s: system(%s) failed: %s\n",
				params->cmdname, cmd, strerror(errno));
		goto err_system;
	}

	/*
	 * Set hashes for images in the blob. Unfortunately we may need more
	 * space in either FDT, so keep trying until we succeed.
	 *
	 * Note: this is pretty inefficient for signing, since we must
	 * calculate the signature every time. It would be better to calculate
	 * all the data and then store it in a separate step. However, this
	 * would be considerably more complex to implement. Generally a few
	 * steps of this loop is enough to sign with several keys.
	 */
	for (size_inc = 0; size_inc < 64 * 1024; size_inc += 1024) {
		ret = fit_add_file_data(params, size_inc, tmpfile);
		if (!ret || ret != -ENOSPC)
			break;
	}

	if (ret) {
		fprintf(stderr, "%s Can't add hashes to FIT blob\n",
			params->cmdname);
		goto err_system;
	}

	if (rename (tmpfile, params->imagefile) == -1) {
		fprintf (stderr, "%s: Can't rename %s to %s: %s\n",
				params->cmdname, tmpfile, params->imagefile,
				strerror (errno));
		unlink (tmpfile);
		unlink (params->imagefile);
		return EXIT_FAILURE;
	}
	return EXIT_SUCCESS;

err_system:
	unlink(tmpfile);
	return -1;
}

static int fit_check_params(struct image_tool_params *params)
{
	return	((params->dflag && (params->fflag || params->lflag)) ||
		(params->fflag && (params->dflag || params->lflag)) ||
		(params->lflag && (params->dflag || params->fflag)));
}

static struct image_type_params fitimage_params = {
	.name = "FIT Image support",
	.header_size = sizeof(image_header_t),
	.hdr = (void*)&header,
	.verify_header = fit_verify_header,
	.print_header = fit_print_contents,
	.check_image_type = fit_check_image_types,
	.fflag_handle = fit_handle_file,
	.set_header = NULL,	/* FIT images use DTB header */
	.check_params = fit_check_params,
};

void init_fit_image_type (void)
{
	register_image_type(&fitimage_params);
}
OpenPOWER on IntegriCloud