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Commit 64d1d77a authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Linus Torvalds
Browse files

hexdump: introduce test suite 



Test different scenarios of function calls located in lib/hexdump.c.

Currently hex_dump_to_buffer() is only tested and test data is provided
for little endian CPUs.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ad3d5d2f

lib/Kconfig.debug

+3 −0
Original line number Diff line number Diff line
@@ -1580,6 +1580,9 @@ config ASYNC_RAID6_TEST 


	  If unsure, say N.



config TEST_HEXDUMP

	tristate "Test functions located in the hexdump module at runtime"



config TEST_STRING_HELPERS

	tristate "Test functions located in the string_helpers module at runtime"

lib/Makefile

+3 −1
Original line number Diff line number Diff line
@@ -23,12 +23,14 @@ lib-y += kobject.o klist.o 
obj-y	+= lockref.o



obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \

	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \

	 bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \

	 gcd.o lcm.o list_sort.o uuid.o flex_array.o clz_ctz.o \

	 bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o \

	 percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o

obj-y += string_helpers.o

obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o

obj-y += hexdump.o

obj-$(CONFIG_TEST_HEXDUMP) += test-hexdump.o

obj-y += kstrtox.o

obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o

obj-$(CONFIG_TEST_LKM) += test_module.o

lib/test-hexdump.c

0 → 100644
+135 −0
Original line number Diff line number Diff line 
/*

 * 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 *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 *test_data_2_le[] __initconst = {

	"32be", "7bdb", "180a", "b293",

	"ba70", "24c4", "837d", "9b34",

	"9ca6", "ad31", "0f9c", "e9ac",

	"d14c", "9919", "b143", "0caf",

};



static const char *test_data_4_le[] __initconst = {

	"7bdb32be", "b293180a", "24c4ba70", "9b34837d",

	"ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",

};



static const char *test_data_8_le[] __initconst = {

	"b293180a7bdb32be", "9b34837d24c4ba70",

	"e9ac0f9cad319ca6", "0cafb1439919d14c",

};



static void __init test_hexdump(size_t len, int rowsize, int groupsize,

				bool ascii)

{

	char test[32 * 3 + 2 + 32 + 1];

	char real[32 * 3 + 2 + 32 + 1];

	char *p;

	const char **result;

	size_t l = len;

	int gs = groupsize, rs = rowsize;

	unsigned int i;



	hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii);



	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;



	memset(test, ' ', sizeof(test));



	/* 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 + 1;

	}

	if (i)

		p--;



	/* ASCII part */

	if (ascii) {

		p = test + rs * 2 + rs / gs + 1;

		strncpy(p, data_a, l);

		p += l;

	}



	*p = '\0';



	if (strcmp(test, real)) {

		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);

		pr_err("Result: '%s'\n", real);

		pr_err("Expect: '%s'\n", test);

	}

}



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);

}



static int __init test_hexdump_init(void)

{

	unsigned int i;

	int rowsize;



	pr_info("Running tests...\n");



	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);



	return -EINVAL;

}

module_init(test_hexdump_init);

MODULE_LICENSE("Dual BSD/GPL");