1 /*
2 * Test cases for lib/hexdump.c module.
3 */
4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/random.h>
10 #include <linux/string.h>
11
12 static const unsigned char data_b[] = {
13 '\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2', /* 00 - 07 */
14 '\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b', /* 08 - 0f */
15 '\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9', /* 10 - 17 */
16 '\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c', /* 18 - 1f */
17 };
18
19 static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";
20
21 static const char * const test_data_1_le[] __initconst = {
22 "be", "32", "db", "7b", "0a", "18", "93", "b2",
23 "70", "ba", "c4", "24", "7d", "83", "34", "9b",
24 "a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
25 "4c", "d1", "19", "99", "43", "b1", "af", "0c",
26 };
27
28 static const char * const test_data_2_le[] __initconst = {
29 "32be", "7bdb", "180a", "b293",
30 "ba70", "24c4", "837d", "9b34",
31 "9ca6", "ad31", "0f9c", "e9ac",
32 "d14c", "9919", "b143", "0caf",
33 };
34
35 static const char * const test_data_4_le[] __initconst = {
36 "7bdb32be", "b293180a", "24c4ba70", "9b34837d",
37 "ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
38 };
39
40 static const char * const test_data_8_le[] __initconst = {
41 "b293180a7bdb32be", "9b34837d24c4ba70",
42 "e9ac0f9cad319ca6", "0cafb1439919d14c",
43 };
44
test_hexdump(size_t len,int rowsize,int groupsize,bool ascii)45 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
46 bool ascii)
47 {
48 char test[32 * 3 + 2 + 32 + 1];
49 char real[32 * 3 + 2 + 32 + 1];
50 char *p;
51 const char * const *result;
52 size_t l = len;
53 int gs = groupsize, rs = rowsize;
54 unsigned int i;
55
56 hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii);
57
58 if (rs != 16 && rs != 32)
59 rs = 16;
60
61 if (l > rs)
62 l = rs;
63
64 if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
65 gs = 1;
66
67 if (gs == 8)
68 result = test_data_8_le;
69 else if (gs == 4)
70 result = test_data_4_le;
71 else if (gs == 2)
72 result = test_data_2_le;
73 else
74 result = test_data_1_le;
75
76 memset(test, ' ', sizeof(test));
77
78 /* hex dump */
79 p = test;
80 for (i = 0; i < l / gs; i++) {
81 const char *q = *result++;
82 size_t amount = strlen(q);
83
84 memcpy(p, q, amount);
85 p += amount + 1;
86 }
87 if (i)
88 p--;
89
90 /* ASCII part */
91 if (ascii) {
92 p = test + rs * 2 + rs / gs + 1;
93 strncpy(p, data_a, l);
94 p += l;
95 }
96
97 *p = '\0';
98
99 if (strcmp(test, real)) {
100 pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
101 pr_err("Result: '%s'\n", real);
102 pr_err("Expect: '%s'\n", test);
103 }
104 }
105
test_hexdump_set(int rowsize,bool ascii)106 static void __init test_hexdump_set(int rowsize, bool ascii)
107 {
108 size_t d = min_t(size_t, sizeof(data_b), rowsize);
109 size_t len = get_random_int() % d + 1;
110
111 test_hexdump(len, rowsize, 4, ascii);
112 test_hexdump(len, rowsize, 2, ascii);
113 test_hexdump(len, rowsize, 8, ascii);
114 test_hexdump(len, rowsize, 1, ascii);
115 }
116
test_hexdump_overflow(bool ascii)117 static void __init test_hexdump_overflow(bool ascii)
118 {
119 char buf[56];
120 const char *t = test_data_1_le[0];
121 size_t l = get_random_int() % sizeof(buf);
122 bool a;
123 int e, r;
124
125 memset(buf, ' ', sizeof(buf));
126
127 r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
128
129 if (ascii)
130 e = 50;
131 else
132 e = 2;
133 buf[e + 2] = '\0';
134
135 if (!l) {
136 a = r == e && buf[0] == ' ';
137 } else if (l < 3) {
138 a = r == e && buf[0] == '\0';
139 } else if (l < 4) {
140 a = r == e && !strcmp(buf, t);
141 } else if (ascii) {
142 if (l < 51)
143 a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
144 else
145 a = r == e && buf[50] == '\0' && buf[49] == '.';
146 } else {
147 a = r == e && buf[e] == '\0';
148 }
149
150 if (!a) {
151 pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
152 pr_err("Result: '%s'\n", buf);
153 }
154 }
155
test_hexdump_init(void)156 static int __init test_hexdump_init(void)
157 {
158 unsigned int i;
159 int rowsize;
160
161 pr_info("Running tests...\n");
162
163 rowsize = (get_random_int() % 2 + 1) * 16;
164 for (i = 0; i < 16; i++)
165 test_hexdump_set(rowsize, false);
166
167 rowsize = (get_random_int() % 2 + 1) * 16;
168 for (i = 0; i < 16; i++)
169 test_hexdump_set(rowsize, true);
170
171 for (i = 0; i < 16; i++)
172 test_hexdump_overflow(false);
173
174 for (i = 0; i < 16; i++)
175 test_hexdump_overflow(true);
176
177 return -EINVAL;
178 }
179 module_init(test_hexdump_init);
180 MODULE_LICENSE("Dual BSD/GPL");
181