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Linux/lib/test_hexdump.c

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  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 
 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 
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 
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 
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 
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 
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 
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 

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