1/*	$NetBSD: truncated_string.c,v 1.1.1.1 2019/12/22 12:34:06 skrll Exp $	*/
2
3// SPDX-License-Identifier: LGPL-2.1-or-later
4/*
5 * libfdt - Flat Device Tree manipulation
6 *	Testcase for misbehaviour on a truncated string
7 * Copyright (C) 2018 David Gibson, IBM Corporation.
8 */
9
10#include <stdlib.h>
11#include <stdio.h>
12#include <string.h>
13#include <stdint.h>
14
15#include <libfdt.h>
16
17#include "tests.h"
18#include "testdata.h"
19
20int main(int argc, char *argv[])
21{
22	void *fdt = &truncated_string;
23	const struct fdt_property *good, *bad;
24	int off, len;
25	const char *name;
26
27	test_init(argc, argv);
28
29	vg_prepare_blob(fdt, fdt_totalsize(fdt));
30
31	off = fdt_first_property_offset(fdt, 0);
32	good = fdt_get_property_by_offset(fdt, off, NULL);
33
34	off = fdt_next_property_offset(fdt, off);
35	bad = fdt_get_property_by_offset(fdt, off, NULL);
36
37	if (fdt32_to_cpu(good->len) != 0)
38		FAIL("Unexpected length for good property");
39	name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len);
40	if (!name)
41		FAIL("fdt_get_string() failed on good property: %s",
42		     fdt_strerror(len));
43	if (len != 4)
44		FAIL("fdt_get_string() returned length %d (not 4) on good property",
45		     len);
46	if (!streq(name, "good"))
47		FAIL("fdt_get_string() returned \"%s\" (not \"good\") on good property",
48		     name);
49
50	if (fdt32_to_cpu(bad->len) != 0)
51		FAIL("Unexpected length for bad property\n");
52	name = fdt_get_string(fdt, fdt32_to_cpu(bad->nameoff), &len);
53	if (name)
54		FAIL("fdt_get_string() succeeded incorrectly on bad property");
55	else if (len != -FDT_ERR_TRUNCATED)
56		FAIL("fdt_get_string() gave unexpected error on bad property: %s",
57		     fdt_strerror(len));
58
59	/* Make sure the 'good' property breaks correctly if we
60	 * truncate the strings section */
61	fdt_set_size_dt_strings(fdt, fdt32_to_cpu(good->nameoff) + 4);
62	name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len);
63	if (name)
64		FAIL("fdt_get_string() succeeded incorrectly on mangled property");
65	else if (len != -FDT_ERR_TRUNCATED)
66		FAIL("fdt_get_string() gave unexpected error on mangled property: %s",
67		     fdt_strerror(len));
68
69	PASS();
70}
71