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 void __init test_hexdump_prepare_test(size_t len, int rowsize,
  48                                              int groupsize, char *test,
  49                                              size_t testlen, bool ascii)
  50 {
  51         char *p;
  52         const char * const *result;
  53         size_t l = len;
  54         int gs = groupsize, rs = rowsize;
  55         unsigned int i;
  56
  57         if (rs != 16 && rs != 32)
  58                 rs = 16;
  59
  60         if (l > rs)
  61                 l = rs;
  62
  63         if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
  64                 gs = 1;
  65
  66         if (gs == 8)
  67                 result = test_data_8_le;
  68         else if (gs == 4)
  69                 result = test_data_4_le;
  70         else if (gs == 2)
  71                 result = test_data_2_le;
  72         else
  73                 result = test_data_1_le;
  74
  75         memset(test, FILL_CHAR, testlen);
  76
  77         /* hex dump */
  78         p = test;
  79         for (i = 0; i < l / gs; i++) {
  80                 const char *q = *result++;
  81                 size_t amount = strlen(q);
  82
  83                 strncpy(p, q, amount);
  84                 p += amount;
  85
  86                 *p++ = ' ';
  87         }
  88         if (i)
  89                 p--;
  90
  91         /* ASCII part */
  92         if (ascii) {
  93                 do {
  94                         *p++ = ' ';
  95                 } while (p < test + rs * 2 + rs / gs + 1);
  96
  97                 strncpy(p, data_a, l);
  98                 p += l;
  99         }
 100
 101         *p = '\0';
 102 }
 103
 104 #define TEST_HEXDUMP_BUF_SIZE           (32 * 3 + 2 + 32 + 1)
 105
 106 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
 107                                 bool ascii)
 108 {
 109         char test[TEST_HEXDUMP_BUF_SIZE];
 110         char real[TEST_HEXDUMP_BUF_SIZE];
 111
 112         hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
 113                            ascii);
 114
 115         test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
 116                                   ascii);
 117
 118         if (strcmp(test, real)) {
 119                 pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
 120                 pr_err("Result: '%s'\n", real);
 121                 pr_err("Expect: '%s'\n", test);
 122         }
 123 }
 124
 125 static void __init test_hexdump_set(int rowsize, bool ascii)
 126 {
 127         size_t d = min_t(size_t, sizeof(data_b), rowsize);
 128         size_t len = get_random_int() % d + 1;
 129
 130         test_hexdump(len, rowsize, 4, ascii);
 131         test_hexdump(len, rowsize, 2, ascii);
 132         test_hexdump(len, rowsize, 8, ascii);
 133         test_hexdump(len, rowsize, 1, ascii);
 134 }
 135
 136 static void __init test_hexdump_overflow(bool ascii)
 137 {
 138         char buf[56];
 139         const char *t = test_data_1_le[0];
 140         size_t l = get_random_int() % sizeof(buf);
 141         bool a;
 142         int e, r;
 143
 144         memset(buf, FILL_CHAR, sizeof(buf));
 145
 146         r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
 147
 148         if (ascii)
 149                 e = 50;
 150         else
 151                 e = 2;
 152         buf[e + 2] = '\0';
 153
 154         if (!l) {
 155                 a = r == e && buf[0] == FILL_CHAR;
 156         } else if (l < 3) {
 157                 a = r == e && buf[0] == '\0';
 158         } else if (l < 4) {
 159                 a = r == e && !strcmp(buf, t);
 160         } else if (ascii) {
 161                 if (l < 51)
 162                         a = r == e && buf[l - 1] == '\0' && buf[l - 2] == FILL_CHAR;
 163                 else
 164                         a = r == e && buf[50] == '\0' && buf[49] == '.';
 165         } else {
 166                 a = r == e && buf[e] == '\0';
 167         }
 168
 169         if (!a) {
 170                 pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
 171                 pr_err("Result: '%s'\n", buf);
 172         }
 173 }
 174
 175 static int __init test_hexdump_init(void)
 176 {
 177         unsigned int i;
 178         int rowsize;
 179
 180         pr_info("Running tests...\n");
 181
 182         rowsize = (get_random_int() % 2 + 1) * 16;
 183         for (i = 0; i < 16; i++)
 184                 test_hexdump_set(rowsize, false);
 185
 186         rowsize = (get_random_int() % 2 + 1) * 16;
 187         for (i = 0; i < 16; i++)
 188                 test_hexdump_set(rowsize, true);
 189
 190         for (i = 0; i < 16; i++)
 191                 test_hexdump_overflow(false);
 192
 193         for (i = 0; i < 16; i++)
 194                 test_hexdump_overflow(true);
 195
 196         return -EINVAL;
 197 }
 198 module_init(test_hexdump_init);
 199 MODULE_LICENSE("Dual BSD/GPL");