lib/test_hexdump.c

   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                 strncpy(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");