aboutsummaryrefslogtreecommitdiffstats
path: root/lib/test-hexdump.c
blob: 5241df36eedf922b19adc9429225ed006b6b851d (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
/*
 * Test cases for lib/hexdump.c module.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/string.h>

static const unsigned char data_b[] = {
	'\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2',	/* 00 - 07 */
	'\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b',	/* 08 - 0f */
	'\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9',	/* 10 - 17 */
	'\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c',	/* 18 - 1f */
};

static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";

static const char * const test_data_1_le[] __initconst = {
	"be", "32", "db", "7b", "0a", "18", "93", "b2",
	"70", "ba", "c4", "24", "7d", "83", "34", "9b",
	"a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
	"4c", "d1", "19", "99", "43", "b1", "af", "0c",
};

static const char * const test_data_2_le[] __initconst = {
	"32be", "7bdb", "180a", "b293",
	"ba70", "24c4", "837d", "9b34",
	"9ca6", "ad31", "0f9c", "e9ac",
	"d14c", "9919", "b143", "0caf",
};

static const char * const test_data_4_le[] __initconst = {
	"7bdb32be", "b293180a", "24c4ba70", "9b34837d",
	"ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
};

static const char * const test_data_8_le[] __initconst = {
	"b293180a7bdb32be", "9b34837d24c4ba70",
	"e9ac0f9cad319ca6", "0cafb1439919d14c",
};

static void __init test_hexdump(size_t len, int rowsize, int groupsize,
				bool ascii)
{
	char test[32 * 3 + 2 + 32 + 1];
	char real[32 * 3 + 2 + 32 + 1];
	char *p;
	const char * const *result;
	size_t l = len;
	int gs = groupsize, rs = rowsize;
	unsigned int i;

	hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii);

	if (rs != 16 && rs != 32)
		rs = 16;

	if (l > rs)
		l = rs;

	if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
		gs = 1;

	if (gs == 8)
		result = test_data_8_le;
	else if (gs == 4)
		result = test_data_4_le;
	else if (gs == 2)
		result = test_data_2_le;
	else
		result = test_data_1_le;

	memset(test, ' ', sizeof(test));

	/* hex dump */
	p = test;
	for (i = 0; i < l / gs; i++) {
		const char *q = *result++;
		size_t amount = strlen(q);

		strncpy(p, q, amount);
		p += amount + 1;
	}
	if (i)
		p--;

	/* ASCII part */
	if (ascii) {
		p = test + rs * 2 + rs / gs + 1;
		strncpy(p, data_a, l);
		p += l;
	}

	*p = '\0';

	if (strcmp(test, real)) {
		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
		pr_err("Result: '%s'\n", real);
		pr_err("Expect: '%s'\n", test);
	}
}

static void __init test_hexdump_set(int rowsize, bool ascii)
{
	size_t d = min_t(size_t, sizeof(data_b), rowsize);
	size_t len = get_random_int() % d + 1;

	test_hexdump(len, rowsize, 4, ascii);
	test_hexdump(len, rowsize, 2, ascii);
	test_hexdump(len, rowsize, 8, ascii);
	test_hexdump(len, rowsize, 1, ascii);
}

static void __init test_hexdump_overflow(bool ascii)
{
	char buf[56];
	const char *t = test_data_1_le[0];
	size_t l = get_random_int() % sizeof(buf);
	bool a;
	int e, r;

	memset(buf, ' ', sizeof(buf));

	r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);

	if (ascii)
		e = 50;
	else
		e = 2;
	buf[e + 2] = '\0';

	if (!l) {
		a = r == e && buf[0] == ' ';
	} else if (l < 3) {
		a = r == e && buf[0] == '\0';
	} else if (l < 4) {
		a = r == e && !strcmp(buf, t);
	} else if (ascii) {
		if (l < 51)
			a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
		else
			a = r == e && buf[50] == '\0' && buf[49] == '.';
	} else {
		a = r == e && buf[e] == '\0';
	}

	if (!a) {
		pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
		pr_err("Result: '%s'\n", buf);
	}
}

static int __init test_hexdump_init(void)
{
	unsigned int i;
	int rowsize;

	pr_info("Running tests...\n");

	rowsize = (get_random_int() % 2 + 1) * 16;
	for (i = 0; i < 16; i++)
		test_hexdump_set(rowsize, false);

	rowsize = (get_random_int() % 2 + 1) * 16;
	for (i = 0; i < 16; i++)
		test_hexdump_set(rowsize, true);

	for (i = 0; i < 16; i++)
		test_hexdump_overflow(false);

	for (i = 0; i < 16; i++)
		test_hexdump_overflow(true);

	return -EINVAL;
}
module_init(test_hexdump_init);
MODULE_LICENSE("Dual BSD/GPL");

Privacy Policy