257 lines
6.3 KiB
C
257 lines
6.3 KiB
C
/*
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* Test cases for lib/hexdump.c module.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/string.h>
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static const unsigned char data_b[] = {
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'\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2', /* 00 - 07 */
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'\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b', /* 08 - 0f */
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'\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9', /* 10 - 17 */
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'\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c', /* 18 - 1f */
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};
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static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";
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static const char * const test_data_1[] __initconst = {
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"be", "32", "db", "7b", "0a", "18", "93", "b2",
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"70", "ba", "c4", "24", "7d", "83", "34", "9b",
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"a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
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"4c", "d1", "19", "99", "43", "b1", "af", "0c",
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};
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static const char * const test_data_2_le[] __initconst = {
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"32be", "7bdb", "180a", "b293",
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"ba70", "24c4", "837d", "9b34",
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"9ca6", "ad31", "0f9c", "e9ac",
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"d14c", "9919", "b143", "0caf",
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};
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static const char * const test_data_2_be[] __initconst = {
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"be32", "db7b", "0a18", "93b2",
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"70ba", "c424", "7d83", "349b",
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"a69c", "31ad", "9c0f", "ace9",
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"4cd1", "1999", "43b1", "af0c",
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};
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static const char * const test_data_4_le[] __initconst = {
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"7bdb32be", "b293180a", "24c4ba70", "9b34837d",
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"ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
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};
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static const char * const test_data_4_be[] __initconst = {
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"be32db7b", "0a1893b2", "70bac424", "7d83349b",
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"a69c31ad", "9c0face9", "4cd11999", "43b1af0c",
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};
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static const char * const test_data_8_le[] __initconst = {
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"b293180a7bdb32be", "9b34837d24c4ba70",
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"e9ac0f9cad319ca6", "0cafb1439919d14c",
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};
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static const char * const test_data_8_be[] __initconst = {
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"be32db7b0a1893b2", "70bac4247d83349b",
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"a69c31ad9c0face9", "4cd1199943b1af0c",
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};
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#define FILL_CHAR '#'
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static unsigned total_tests __initdata;
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static unsigned failed_tests __initdata;
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static void __init test_hexdump_prepare_test(size_t len, int rowsize,
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int groupsize, char *test,
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size_t testlen, bool ascii)
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{
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char *p;
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const char * const *result;
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size_t l = len;
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int gs = groupsize, rs = rowsize;
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unsigned int i;
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const bool is_be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
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if (rs != 16 && rs != 32)
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rs = 16;
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if (l > rs)
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l = rs;
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if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
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gs = 1;
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if (gs == 8)
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result = is_be ? test_data_8_be : test_data_8_le;
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else if (gs == 4)
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result = is_be ? test_data_4_be : test_data_4_le;
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else if (gs == 2)
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result = is_be ? test_data_2_be : test_data_2_le;
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else
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result = test_data_1;
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/* hex dump */
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p = test;
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for (i = 0; i < l / gs; i++) {
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const char *q = *result++;
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size_t amount = strlen(q);
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strncpy(p, q, amount);
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p += amount;
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*p++ = ' ';
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}
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if (i)
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p--;
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/* ASCII part */
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if (ascii) {
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do {
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*p++ = ' ';
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} while (p < test + rs * 2 + rs / gs + 1);
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strncpy(p, data_a, l);
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p += l;
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}
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*p = '\0';
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}
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#define TEST_HEXDUMP_BUF_SIZE (32 * 3 + 2 + 32 + 1)
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static void __init test_hexdump(size_t len, int rowsize, int groupsize,
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bool ascii)
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{
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char test[TEST_HEXDUMP_BUF_SIZE];
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char real[TEST_HEXDUMP_BUF_SIZE];
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total_tests++;
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memset(real, FILL_CHAR, sizeof(real));
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hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
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ascii);
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memset(test, FILL_CHAR, sizeof(test));
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test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
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ascii);
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if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
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pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
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pr_err("Result: '%s'\n", real);
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pr_err("Expect: '%s'\n", test);
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failed_tests++;
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}
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}
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static void __init test_hexdump_set(int rowsize, bool ascii)
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{
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size_t d = min_t(size_t, sizeof(data_b), rowsize);
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size_t len = get_random_int() % d + 1;
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test_hexdump(len, rowsize, 4, ascii);
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test_hexdump(len, rowsize, 2, ascii);
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test_hexdump(len, rowsize, 8, ascii);
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test_hexdump(len, rowsize, 1, ascii);
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}
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static void __init test_hexdump_overflow(size_t buflen, size_t len,
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int rowsize, int groupsize,
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bool ascii)
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{
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char test[TEST_HEXDUMP_BUF_SIZE];
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char buf[TEST_HEXDUMP_BUF_SIZE];
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int rs = rowsize, gs = groupsize;
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int ae, he, e, f, r;
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bool a;
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total_tests++;
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memset(buf, FILL_CHAR, sizeof(buf));
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r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
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/*
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* Caller must provide the data length multiple of groupsize. The
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* calculations below are made with that assumption in mind.
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*/
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ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */;
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he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */;
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if (ascii)
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e = ae;
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else
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e = he;
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f = min_t(int, e + 1, buflen);
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if (buflen) {
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test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii);
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test[f - 1] = '\0';
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}
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memset(test + f, FILL_CHAR, sizeof(test) - f);
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a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
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buf[sizeof(buf) - 1] = '\0';
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if (!a) {
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pr_err("Len: %zu buflen: %zu strlen: %zu\n",
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len, buflen, strnlen(buf, sizeof(buf)));
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pr_err("Result: %d '%s'\n", r, buf);
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pr_err("Expect: %d '%s'\n", e, test);
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failed_tests++;
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}
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}
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static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
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{
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unsigned int i = 0;
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int rs = (get_random_int() % 2 + 1) * 16;
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do {
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int gs = 1 << i;
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size_t len = get_random_int() % rs + gs;
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test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
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} while (i++ < 3);
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}
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static int __init test_hexdump_init(void)
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{
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unsigned int i;
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int rowsize;
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rowsize = (get_random_int() % 2 + 1) * 16;
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for (i = 0; i < 16; i++)
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test_hexdump_set(rowsize, false);
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rowsize = (get_random_int() % 2 + 1) * 16;
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for (i = 0; i < 16; i++)
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test_hexdump_set(rowsize, true);
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for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
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test_hexdump_overflow_set(i, false);
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for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
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test_hexdump_overflow_set(i, true);
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if (failed_tests == 0)
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pr_info("all %u tests passed\n", total_tests);
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else
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pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
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return failed_tests ? -EINVAL : 0;
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}
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module_init(test_hexdump_init);
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static void __exit test_hexdump_exit(void)
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{
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/* do nothing */
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}
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module_exit(test_hexdump_exit);
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MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
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MODULE_LICENSE("Dual BSD/GPL");
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