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Linux/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                 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 

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