cregit-Linux how code gets into the kernel

Release 4.9 lib/test_hexdump.c

Directory: lib
/*
 * Test cases for lib/hexdump.c module.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/string.h>


static const unsigned char data_b[] = {
	'\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2',	/* 00 - 07 */
	'\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b',	/* 08 - 0f */
	'\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9',	/* 10 - 17 */
	'\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c',	/* 18 - 1f */
};


static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";


static const char * const test_data_1_le[] __initconst = {
	"be", "32", "db", "7b", "0a", "18", "93", "b2",
	"70", "ba", "c4", "24", "7d", "83", "34", "9b",
	"a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
	"4c", "d1", "19", "99", "43", "b1", "af", "0c",
};


static const char * const test_data_2_le[] __initconst = {
	"32be", "7bdb", "180a", "b293",
	"ba70", "24c4", "837d", "9b34",
	"9ca6", "ad31", "0f9c", "e9ac",
	"d14c", "9919", "b143", "0caf",
};


static const char * const test_data_4_le[] __initconst = {
	"7bdb32be", "b293180a", "24c4ba70", "9b34837d",
	"ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
};


static const char * const test_data_8_le[] __initconst = {
	"b293180a7bdb32be", "9b34837d24c4ba70",
	"e9ac0f9cad319ca6", "0cafb1439919d14c",
};


#define FILL_CHAR	'#'


static unsigned total_tests __initdata;

static unsigned failed_tests __initdata;


static void __init test_hexdump_prepare_test(size_t len, int rowsize, int groupsize, char *test, size_t testlen, bool ascii) { char *p; const char * const *result; size_t l = len; int gs = groupsize, rs = rowsize; unsigned int i; if (rs != 16 && rs != 32) rs = 16; if (l > rs) l = rs; if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0)) gs = 1; if (gs == 8) result = test_data_8_le; else if (gs == 4) result = test_data_4_le; else if (gs == 2) result = test_data_2_le; else result = test_data_1_le; /* hex dump */ p = test; for (i = 0; i < l / gs; i++) { const char *q = *result++; size_t amount = strlen(q); strncpy(p, q, amount); p += amount; *p++ = ' '; } if (i) p--; /* ASCII part */ if (ascii) { do { *p++ = ' '; } while (p < test + rs * 2 + rs / gs + 1); strncpy(p, data_a, l); p += l; } *p = '\0'; }

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#define TEST_HEXDUMP_BUF_SIZE (32 * 3 + 2 + 32 + 1)
static void __init test_hexdump(size_t len, int rowsize, int groupsize, bool ascii) { char test[TEST_HEXDUMP_BUF_SIZE]; char real[TEST_HEXDUMP_BUF_SIZE]; total_tests++; memset(real, FILL_CHAR, sizeof(real)); hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real), ascii); memset(test, FILL_CHAR, sizeof(test)); test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test), ascii); if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) { pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize); pr_err("Result: '%s'\n", real); pr_err("Expect: '%s'\n", test); failed_tests++; } }

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static void __init test_hexdump_set(int rowsize, bool ascii) { size_t d = min_t(size_t, sizeof(data_b), rowsize); size_t len = get_random_int() % d + 1; test_hexdump(len, rowsize, 4, ascii); test_hexdump(len, rowsize, 2, ascii); test_hexdump(len, rowsize, 8, ascii); test_hexdump(len, rowsize, 1, ascii); }

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static void __init test_hexdump_overflow(size_t buflen, size_t len, int rowsize, int groupsize, bool ascii) { char test[TEST_HEXDUMP_BUF_SIZE]; char buf[TEST_HEXDUMP_BUF_SIZE]; int rs = rowsize, gs = groupsize; int ae, he, e, f, r; bool a; total_tests++; memset(buf, FILL_CHAR, sizeof(buf)); r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii); /* * Caller must provide the data length multiple of groupsize. The * calculations below are made with that assumption in mind. */ ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */; he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */; if (ascii) e = ae; else e = he; f = min_t(int, e + 1, buflen); if (buflen) { test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii); test[f - 1] = '\0'; } memset(test + f, FILL_CHAR, sizeof(test) - f); a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE); buf[sizeof(buf) - 1] = '\0'; if (!a) { pr_err("Len: %zu buflen: %zu strlen: %zu\n", len, buflen, strnlen(buf, sizeof(buf))); pr_err("Result: %d '%s'\n", r, buf); pr_err("Expect: %d '%s'\n", e, test); failed_tests++; } }

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static void __init test_hexdump_overflow_set(size_t buflen, bool ascii) { unsigned int i = 0; int rs = (get_random_int() % 2 + 1) * 16; do { int gs = 1 << i; size_t len = get_random_int() % rs + gs; test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii); } while (i++ < 3); }

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static int __init test_hexdump_init(void) { unsigned int i; int rowsize; rowsize = (get_random_int() % 2 + 1) * 16; for (i = 0; i < 16; i++) test_hexdump_set(rowsize, false); rowsize = (get_random_int() % 2 + 1) * 16; for (i = 0; i < 16; i++) test_hexdump_set(rowsize, true); for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++) test_hexdump_overflow_set(i, false); for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++) test_hexdump_overflow_set(i, true); if (failed_tests == 0) pr_info("all %u tests passed\n", total_tests); else pr_err("failed %u out of %u tests\n", failed_tests, total_tests); return failed_tests ? -EINVAL : 0; }

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module_init(test_hexdump_init);
static void __exit test_hexdump_exit(void) { /* do nothing */ }

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module_exit(test_hexdump_exit); MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); MODULE_LICENSE("Dual BSD/GPL");

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andy shevchenkoandy shevchenko130099.39%1076.92%
geert uytterhoevengeert uytterhoeven60.46%17.69%
andi kleenandi kleen10.08%17.69%
linus torvaldslinus torvalds10.08%17.69%
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Directory: lib