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 strncpy(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"); 239