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[] __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_2_be[] __initconst = {
36 "be32", "db7b", "0a18", "93b2",
37 "70ba", "c424", "7d83", "349b",
38 "a69c", "31ad", "9c0f", "ace9",
39 "4cd1", "1999", "43b1", "af0c",
40 };
41
42 static const char * const test_data_4_le[] __initconst = {
43 "7bdb32be", "b293180a", "24c4ba70", "9b34837d",
44 "ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
45 };
46
47 static const char * const test_data_4_be[] __initconst = {
48 "be32db7b", "0a1893b2", "70bac424", "7d83349b",
49 "a69c31ad", "9c0face9", "4cd11999", "43b1af0c",
50 };
51
52 static const char * const test_data_8_le[] __initconst = {
53 "b293180a7bdb32be", "9b34837d24c4ba70",
54 "e9ac0f9cad319ca6", "0cafb1439919d14c",
55 };
56
57 static const char * const test_data_8_be[] __initconst = {
58 "be32db7b0a1893b2", "70bac4247d83349b",
59 "a69c31ad9c0face9", "4cd1199943b1af0c",
60 };
61
62 #define FILL_CHAR '#'
63
64 static unsigned total_tests __initdata;
65 static unsigned failed_tests __initdata;
66
test_hexdump_prepare_test(size_t len,int rowsize,int groupsize,char * test,size_t testlen,bool ascii)67 static void __init test_hexdump_prepare_test(size_t len, int rowsize,
68 int groupsize, char *test,
69 size_t testlen, bool ascii)
70 {
71 char *p;
72 const char * const *result;
73 size_t l = len;
74 int gs = groupsize, rs = rowsize;
75 unsigned int i;
76 const bool is_be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
77
78 if (rs != 16 && rs != 32)
79 rs = 16;
80
81 if (l > rs)
82 l = rs;
83
84 if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
85 gs = 1;
86
87 if (gs == 8)
88 result = is_be ? test_data_8_be : test_data_8_le;
89 else if (gs == 4)
90 result = is_be ? test_data_4_be : test_data_4_le;
91 else if (gs == 2)
92 result = is_be ? test_data_2_be : test_data_2_le;
93 else
94 result = test_data_1;
95
96 /* hex dump */
97 p = test;
98 for (i = 0; i < l / gs; i++) {
99 const char *q = *result++;
100 size_t amount = strlen(q);
101
102 memcpy(p, q, amount);
103 p += amount;
104
105 *p++ = ' ';
106 }
107 if (i)
108 p--;
109
110 /* ASCII part */
111 if (ascii) {
112 do {
113 *p++ = ' ';
114 } while (p < test + rs * 2 + rs / gs + 1);
115
116 strncpy(p, data_a, l);
117 p += l;
118 }
119
120 *p = '\0';
121 }
122
123 #define TEST_HEXDUMP_BUF_SIZE (32 * 3 + 2 + 32 + 1)
124
test_hexdump(size_t len,int rowsize,int groupsize,bool ascii)125 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
126 bool ascii)
127 {
128 char test[TEST_HEXDUMP_BUF_SIZE];
129 char real[TEST_HEXDUMP_BUF_SIZE];
130
131 total_tests++;
132
133 memset(real, FILL_CHAR, sizeof(real));
134 hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
135 ascii);
136
137 memset(test, FILL_CHAR, sizeof(test));
138 test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
139 ascii);
140
141 if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
142 pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
143 pr_err("Result: '%s'\n", real);
144 pr_err("Expect: '%s'\n", test);
145 failed_tests++;
146 }
147 }
148
test_hexdump_set(int rowsize,bool ascii)149 static void __init test_hexdump_set(int rowsize, bool ascii)
150 {
151 size_t d = min_t(size_t, sizeof(data_b), rowsize);
152 size_t len = get_random_int() % d + 1;
153
154 test_hexdump(len, rowsize, 4, ascii);
155 test_hexdump(len, rowsize, 2, ascii);
156 test_hexdump(len, rowsize, 8, ascii);
157 test_hexdump(len, rowsize, 1, ascii);
158 }
159
test_hexdump_overflow(size_t buflen,size_t len,int rowsize,int groupsize,bool ascii)160 static void __init test_hexdump_overflow(size_t buflen, size_t len,
161 int rowsize, int groupsize,
162 bool ascii)
163 {
164 char test[TEST_HEXDUMP_BUF_SIZE];
165 char buf[TEST_HEXDUMP_BUF_SIZE];
166 int rs = rowsize, gs = groupsize;
167 int ae, he, e, f, r;
168 bool a;
169
170 total_tests++;
171
172 memset(buf, FILL_CHAR, sizeof(buf));
173
174 r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
175
176 /*
177 * Caller must provide the data length multiple of groupsize. The
178 * calculations below are made with that assumption in mind.
179 */
180 ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */;
181 he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */;
182
183 if (ascii)
184 e = ae;
185 else
186 e = he;
187
188 f = min_t(int, e + 1, buflen);
189 if (buflen) {
190 test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii);
191 test[f - 1] = '\0';
192 }
193 memset(test + f, FILL_CHAR, sizeof(test) - f);
194
195 a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
196
197 buf[sizeof(buf) - 1] = '\0';
198
199 if (!a) {
200 pr_err("Len: %zu buflen: %zu strlen: %zu\n",
201 len, buflen, strnlen(buf, sizeof(buf)));
202 pr_err("Result: %d '%s'\n", r, buf);
203 pr_err("Expect: %d '%s'\n", e, test);
204 failed_tests++;
205 }
206 }
207
test_hexdump_overflow_set(size_t buflen,bool ascii)208 static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
209 {
210 unsigned int i = 0;
211 int rs = (get_random_int() % 2 + 1) * 16;
212
213 do {
214 int gs = 1 << i;
215 size_t len = get_random_int() % rs + gs;
216
217 test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
218 } while (i++ < 3);
219 }
220
test_hexdump_init(void)221 static int __init test_hexdump_init(void)
222 {
223 unsigned int i;
224 int rowsize;
225
226 rowsize = (get_random_int() % 2 + 1) * 16;
227 for (i = 0; i < 16; i++)
228 test_hexdump_set(rowsize, false);
229
230 rowsize = (get_random_int() % 2 + 1) * 16;
231 for (i = 0; i < 16; i++)
232 test_hexdump_set(rowsize, true);
233
234 for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
235 test_hexdump_overflow_set(i, false);
236
237 for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
238 test_hexdump_overflow_set(i, true);
239
240 if (failed_tests == 0)
241 pr_info("all %u tests passed\n", total_tests);
242 else
243 pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
244
245 return failed_tests ? -EINVAL : 0;
246 }
247 module_init(test_hexdump_init);
248
test_hexdump_exit(void)249 static void __exit test_hexdump_exit(void)
250 {
251 /* do nothing */
252 }
253 module_exit(test_hexdump_exit);
254
255 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
256 MODULE_LICENSE("Dual BSD/GPL");
257
