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_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
  45 #define FILL_CHAR       '#'
  46
  47 static unsigned total_tests __initdata;
  48 static unsigned failed_tests __initdata;
  49
  50 static void __init test_hexdump_prepare_test(size_t len, int rowsize,
  51                                              int groupsize, char *test,
  52                                              size_t testlen, bool ascii)
  53 {
  54         char *p;
  55         const char * const *result;
  56         size_t l = len;
  57         int gs = groupsize, rs = rowsize;
  58         unsigned int i;
  59
  60         if (rs != 16 && rs != 32)
  61                 rs = 16;
  62
  63         if (l > rs)
  64                 l = rs;
  65
  66         if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
  67                 gs = 1;
  68
  69         if (gs == 8)
  70                 result = test_data_8_le;
  71         else if (gs == 4)
  72                 result = test_data_4_le;
  73         else if (gs == 2)
  74                 result = test_data_2_le;
  75         else
  76                 result = test_data_1_le;
  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;
  86
  87                 *p++ = ' ';
  88         }
  89         if (i)
  90                 p--;
  91
  92         /* ASCII part */
  93         if (ascii) {
  94                 do {
  95                         *p++ = ' ';
  96                 } while (p < test + rs * 2 + rs / gs + 1);
  97
  98                 strncpy(p, data_a, l);
  99                 p += l;
 100         }
 101
 102         *p = '\0';
 103 }
 104
 105 #define TEST_HEXDUMP_BUF_SIZE           (32 * 3 + 2 + 32 + 1)
 106
 107 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
 108                                 bool ascii)
 109 {
 110         char test[TEST_HEXDUMP_BUF_SIZE];
 111         char real[TEST_HEXDUMP_BUF_SIZE];
 112
 113         total_tests++;
 114
 115         memset(real, FILL_CHAR, sizeof(real));
 116         hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
 117                            ascii);
 118
 119         memset(test, FILL_CHAR, sizeof(test));
 120         test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
 121                                   ascii);
 122
 123         if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
 124                 pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
 125                 pr_err("Result: '%s'\n", real);
 126                 pr_err("Expect: '%s'\n", test);
 127                 failed_tests++;
 128         }
 129 }
 130
 131 static void __init test_hexdump_set(int rowsize, bool ascii)
 132 {
 133         size_t d = min_t(size_t, sizeof(data_b), rowsize);
 134         size_t len = get_random_int() % d + 1;
 135
 136         test_hexdump(len, rowsize, 4, ascii);
 137         test_hexdump(len, rowsize, 2, ascii);
 138         test_hexdump(len, rowsize, 8, ascii);
 139         test_hexdump(len, rowsize, 1, ascii);
 140 }
 141
 142 static void __init test_hexdump_overflow(size_t buflen, size_t len,
 143                                          int rowsize, int groupsize,
 144                                          bool ascii)
 145 {
 146         char test[TEST_HEXDUMP_BUF_SIZE];
 147         char buf[TEST_HEXDUMP_BUF_SIZE];
 148         int rs = rowsize, gs = groupsize;
 149         int ae, he, e, f, r;
 150         bool a;
 151
 152         total_tests++;
 153
 154         memset(buf, FILL_CHAR, sizeof(buf));
 155
 156         r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
 157
 158         /*
 159          * Caller must provide the data length multiple of groupsize. The
 160          * calculations below are made with that assumption in mind.
 161          */
 162         ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */;
 163         he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */;
 164
 165         if (ascii)
 166                 e = ae;
 167         else
 168                 e = he;
 169
 170         f = min_t(int, e + 1, buflen);
 171         if (buflen) {
 172                 test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii);
 173                 test[f - 1] = '\0';
 174         }
 175         memset(test + f, FILL_CHAR, sizeof(test) - f);
 176
 177         a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
 178
 179         buf[sizeof(buf) - 1] = '\0';
 180
 181         if (!a) {
 182                 pr_err("Len: %zu buflen: %zu strlen: %zu\n",
 183                         len, buflen, strnlen(buf, sizeof(buf)));
 184                 pr_err("Result: %d '%s'\n", r, buf);
 185                 pr_err("Expect: %d '%s'\n", e, test);
 186                 failed_tests++;
 187         }
 188 }
 189
 190 static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
 191 {
 192         unsigned int i = 0;
 193         int rs = (get_random_int() % 2 + 1) * 16;
 194
 195         do {
 196                 int gs = 1 << i;
 197                 size_t len = get_random_int() % rs + gs;
 198
 199                 test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
 200         } while (i++ < 3);
 201 }
 202
 203 static int __init test_hexdump_init(void)
 204 {
 205         unsigned int i;
 206         int rowsize;
 207
 208         rowsize = (get_random_int() % 2 + 1) * 16;
 209         for (i = 0; i < 16; i++)
 210                 test_hexdump_set(rowsize, false);
 211
 212         rowsize = (get_random_int() % 2 + 1) * 16;
 213         for (i = 0; i < 16; i++)
 214                 test_hexdump_set(rowsize, true);
 215
 216         for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
 217                 test_hexdump_overflow_set(i, false);
 218
 219         for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
 220                 test_hexdump_overflow_set(i, true);
 221
 222         if (failed_tests == 0)
 223                 pr_info("all %u tests passed\n", total_tests);
 224         else
 225                 pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
 226
 227         return failed_tests ? -EINVAL : 0;
 228 }
 229 module_init(test_hexdump_init);
 230
 231 static void __exit test_hexdump_exit(void)
 232 {
 233         /* do nothing */
 234 }
 235 module_exit(test_hexdump_exit);
 236
 237 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 238 MODULE_LICENSE("Dual BSD/GPL");