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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2015-02-12 15:02:21 -08:00 committed by Linus Torvalds
parent ad3d5d2f7d
commit 64d1d77a44
3 changed files with 141 additions and 1 deletions

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@ -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"

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@ -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

135
lib/test-hexdump.c Normal file
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@ -0,0 +1,135 @@
/*
* 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");