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Commit cfaff0e5 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Linus Torvalds
Browse files

lib/uuid: add a test module 



It appears that somehow I missed a test of the latest UUID rework which
landed in the kernel.  Present a small test module to avoid such cases
in the future.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1a695a90

lib/Kconfig.debug

+3 −0
Original line number Diff line number Diff line
@@ -1841,6 +1841,9 @@ config TEST_BITMAP 


	  If unsure, say N.



config TEST_UUID

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



config TEST_RHASHTABLE

	tristate "Perform selftest on resizable hash table"

	default n

lib/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o 
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o

obj-$(CONFIG_TEST_PRINTF) += test_printf.o

obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o

obj-$(CONFIG_TEST_UUID) += test_uuid.o



ifeq ($(CONFIG_DEBUG_KOBJECT),y)

CFLAGS_kobject.o += -DDEBUG

lib/test_uuid.c

0 → 100644
+133 −0
Original line number Diff line number Diff line 
/*

 * Test cases for lib/uuid.c module.

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/string.h>

#include <linux/uuid.h>



struct test_uuid_data {

	const char *uuid;

	uuid_le le;

	uuid_be be;

};



static const struct test_uuid_data test_uuid_test_data[] = {

	{

		.uuid = "c33f4995-3701-450e-9fbf-206a2e98e576",

		.le = UUID_LE(0xc33f4995, 0x3701, 0x450e, 0x9f, 0xbf, 0x20, 0x6a, 0x2e, 0x98, 0xe5, 0x76),

		.be = UUID_BE(0xc33f4995, 0x3701, 0x450e, 0x9f, 0xbf, 0x20, 0x6a, 0x2e, 0x98, 0xe5, 0x76),

	},

	{

		.uuid = "64b4371c-77c1-48f9-8221-29f054fc023b",

		.le = UUID_LE(0x64b4371c, 0x77c1, 0x48f9, 0x82, 0x21, 0x29, 0xf0, 0x54, 0xfc, 0x02, 0x3b),

		.be = UUID_BE(0x64b4371c, 0x77c1, 0x48f9, 0x82, 0x21, 0x29, 0xf0, 0x54, 0xfc, 0x02, 0x3b),

	},

	{

		.uuid = "0cb4ddff-a545-4401-9d06-688af53e7f84",

		.le = UUID_LE(0x0cb4ddff, 0xa545, 0x4401, 0x9d, 0x06, 0x68, 0x8a, 0xf5, 0x3e, 0x7f, 0x84),

		.be = UUID_BE(0x0cb4ddff, 0xa545, 0x4401, 0x9d, 0x06, 0x68, 0x8a, 0xf5, 0x3e, 0x7f, 0x84),

	},

};



static const char * const test_uuid_wrong_data[] = {

	"c33f4995-3701-450e-9fbf206a2e98e576 ",	/* no hyphen(s) */

	"64b4371c-77c1-48f9-8221-29f054XX023b",	/* invalid character(s) */

	"0cb4ddff-a545-4401-9d06-688af53e",	/* not enough data */

};



static unsigned total_tests __initdata;

static unsigned failed_tests __initdata;



static void __init test_uuid_failed(const char *prefix, bool wrong, bool be,

				    const char *data, const char *actual)

{

	pr_err("%s test #%u %s %s data: '%s'\n",

	       prefix,

	       total_tests,

	       wrong ? "passed on wrong" : "failed on",

	       be ? "BE" : "LE",

	       data);

	if (actual && *actual)

		pr_err("%s test #%u actual data: '%s'\n",

		       prefix,

		       total_tests,

		       actual);

	failed_tests++;

}



static void __init test_uuid_test(const struct test_uuid_data *data)

{

	uuid_le le;

	uuid_be be;

	char buf[48];



	/* LE */

	total_tests++;

	if (uuid_le_to_bin(data->uuid, &le))

		test_uuid_failed("conversion", false, false, data->uuid, NULL);



	total_tests++;

	if (uuid_le_cmp(data->le, le)) {

		sprintf(buf, "%pUl", &le);

		test_uuid_failed("cmp", false, false, data->uuid, buf);

	}



	/* BE */

	total_tests++;

	if (uuid_be_to_bin(data->uuid, &be))

		test_uuid_failed("conversion", false, true, data->uuid, NULL);



	total_tests++;

	if (uuid_be_cmp(data->be, be)) {

		sprintf(buf, "%pUb", &be);

		test_uuid_failed("cmp", false, true, data->uuid, buf);

	}

}



static void __init test_uuid_wrong(const char *data)

{

	uuid_le le;

	uuid_be be;



	/* LE */

	total_tests++;

	if (!uuid_le_to_bin(data, &le))

		test_uuid_failed("negative", true, false, data, NULL);



	/* BE */

	total_tests++;

	if (!uuid_be_to_bin(data, &be))

		test_uuid_failed("negative", true, true, data, NULL);

}



static int __init test_uuid_init(void)

{

	unsigned int i;



	for (i = 0; i < ARRAY_SIZE(test_uuid_test_data); i++)

		test_uuid_test(&test_uuid_test_data[i]);



	for (i = 0; i < ARRAY_SIZE(test_uuid_wrong_data); i++)

		test_uuid_wrong(test_uuid_wrong_data[i]);



	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;

}

module_init(test_uuid_init);



static void __exit test_uuid_exit(void)

{

	/* do nothing */

}

module_exit(test_uuid_exit);



MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");

MODULE_LICENSE("Dual BSD/GPL");