1
2
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
12static const unsigned char data_b[] = {
13 '\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2',
14 '\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b',
15 '\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9',
16 '\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c',
17};
18
19static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";
20
21static 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
28static 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
35static const char * const test_data_4_le[] __initconst = {
36 "7bdb32be", "b293180a", "24c4ba70", "9b34837d",
37 "ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
38};
39
40static const char * const test_data_8_le[] __initconst = {
41 "b293180a7bdb32be", "9b34837d24c4ba70",
42 "e9ac0f9cad319ca6", "0cafb1439919d14c",
43};
44
45#define FILL_CHAR '#'
46
47static unsigned total_tests __initdata;
48static unsigned failed_tests __initdata;
49
50static 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
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
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
107static 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
131static 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
142static 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
160
161
162 ae = rs * 2 + rs / gs + 1 + len ;
163 he = (gs * 2 + 1 ) * len / gs - 1 ;
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
190static 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
203static 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}
229module_init(test_hexdump_init);
230
231static void __exit test_hexdump_exit(void)
232{
233
234}
235module_exit(test_hexdump_exit);
236
237MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
238MODULE_LICENSE("Dual BSD/GPL");
239
