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 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
  46                                 bool ascii)
  47 {
  48         char test[32 * 3 + 2 + 32 + 1];
  49         char real[32 * 3 + 2 + 32 + 1];
  50         char *p;
  51         const char * const *result;
  52         size_t l = len;
  53         int gs = groupsize, rs = rowsize;
  54         unsigned int i;
  55
  56         hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii);
  57
  58         if (rs != 16 && rs != 32)
  59                 rs = 16;
  60
  61         if (l > rs)
  62                 l = rs;
  63
  64         if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
  65                 gs = 1;
  66
  67         if (gs == 8)
  68                 result = test_data_8_le;
  69         else if (gs == 4)
  70                 result = test_data_4_le;
  71         else if (gs == 2)
  72                 result = test_data_2_le;
  73         else
  74                 result = test_data_1_le;
  75
  76         memset(test, ' ', sizeof(test));
  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                 strncpy(p, q, amount);
  85                 p += amount + 1;
  86         }
  87         if (i)
  88                 p--;
  89
  90         /* ASCII part */
  91         if (ascii) {
  92                 p = test + rs * 2 + rs / gs + 1;
  93                 strncpy(p, data_a, l);
  94                 p += l;
  95         }
  96
  97         *p = '\0';
  98
  99         if (strcmp(test, real)) {
 100                 pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
 101                 pr_err("Result: '%s'\n", real);
 102                 pr_err("Expect: '%s'\n", test);
 103         }
 104 }
 105
 106 static void __init test_hexdump_set(int rowsize, bool ascii)
 107 {
 108         size_t d = min_t(size_t, sizeof(data_b), rowsize);
 109         size_t len = get_random_int() % d + 1;
 110
 111         test_hexdump(len, rowsize, 4, ascii);
 112         test_hexdump(len, rowsize, 2, ascii);
 113         test_hexdump(len, rowsize, 8, ascii);
 114         test_hexdump(len, rowsize, 1, ascii);
 115 }
 116
 117 static void __init test_hexdump_overflow(bool ascii)
 118 {
 119         char buf[56];
 120         const char *t = test_data_1_le[0];
 121         size_t l = get_random_int() % sizeof(buf);
 122         bool a;
 123         int e, r;
 124
 125         memset(buf, ' ', sizeof(buf));
 126
 127         r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
 128
 129         if (ascii)
 130                 e = 50;
 131         else
 132                 e = 2;
 133         buf[e + 2] = '\0';
 134
 135         if (!l) {
 136                 a = r == e && buf[0] == ' ';
 137         } else if (l < 3) {
 138                 a = r == e && buf[0] == '\0';
 139         } else if (l < 4) {
 140                 a = r == e && !strcmp(buf, t);
 141         } else if (ascii) {
 142                 if (l < 51)
 143                         a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
 144                 else
 145                         a = r == e && buf[50] == '\0' && buf[49] == '.';
 146         } else {
 147                 a = r == e && buf[e] == '\0';
 148         }
 149
 150         if (!a) {
 151                 pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
 152                 pr_err("Result: '%s'\n", buf);
 153         }
 154 }
 155
 156 static int __init test_hexdump_init(void)
 157 {
 158         unsigned int i;
 159         int rowsize;
 160
 161         pr_info("Running tests...\n");
 162
 163         rowsize = (get_random_int() % 2 + 1) * 16;
 164         for (i = 0; i < 16; i++)
 165                 test_hexdump_set(rowsize, false);
 166
 167         rowsize = (get_random_int() % 2 + 1) * 16;
 168         for (i = 0; i < 16; i++)
 169                 test_hexdump_set(rowsize, true);
 170
 171         for (i = 0; i < 16; i++)
 172                 test_hexdump_overflow(false);
 173
 174         for (i = 0; i < 16; i++)
 175                 test_hexdump_overflow(true);
 176
 177         return -EINVAL;
 178 }
 179 module_init(test_hexdump_init);
 180 MODULE_LICENSE("Dual BSD/GPL");