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kernel/lib/tests/string_helpers_kunit.c
Kees Cook db6fe4d61e lib: Move KUnit tests into tests/ subdirectory 
Following from the recent KUnit file naming discussion[1], move all
KUnit tests in lib/ into lib/tests/.

Link: https://lore.kernel.org/lkml/20240720165441.it.320-kees@kernel.org/ [1]
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: David Gow <davidgow@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Rae Moar <rmoar@google.com>
Link: https://lore.kernel.org/r/20241202075545.3648096-4-davidgow@google.com
Signed-off-by: Kees Cook <kees@kernel.org>
2025-02-10 18:25:39 -08:00

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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Test cases for lib/string_helpers.c module.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <kunit/test.h>
#include <linux/array_size.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/string_helpers.h>
static void test_string_check_buf(struct kunit *test,
const char *name, unsigned int flags,
char *in, size_t p,
char *out_real, size_t q_real,
char *out_test, size_t q_test)
{
KUNIT_ASSERT_EQ_MSG(test, q_real, q_test, "name:%s", name);
KUNIT_EXPECT_MEMEQ_MSG(test, out_test, out_real, q_test,
"name:%s", name);
}
struct test_string {
const char *in;
const char *out;
unsigned int flags;
};
static const struct test_string strings[] = {
{
.in = "\\f\\ \\n\\r\\t\\v",
.out = "\f\\ \n\r\t\v",
.flags = UNESCAPE_SPACE,
},
{
.in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",
.out = " \001\00387\0064\005 \\8aH?7",
.flags = UNESCAPE_OCTAL,
},
{
.in = "\\xv\\xa\\x2c\\xD\\x6f2",
.out = "\\xv\n,\ro2",
.flags = UNESCAPE_HEX,
},
{
.in = "\\h\\\\\\\"\\a\\e\\",
.out = "\\h\\\"\a\e\\",
.flags = UNESCAPE_SPECIAL,
},
};
static void test_string_unescape(struct kunit *test,
const char *name, unsigned int flags,
bool inplace)
{
int q_real = 256;
char *in = kunit_kzalloc(test, q_real, GFP_KERNEL);
char *out_test = kunit_kzalloc(test, q_real, GFP_KERNEL);
char *out_real = kunit_kzalloc(test, q_real, GFP_KERNEL);
int i, p = 0, q_test = 0;
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, in);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_test);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_real);
for (i = 0; i < ARRAY_SIZE(strings); i++) {
const char *s = strings[i].in;
int len = strlen(strings[i].in);
/* Copy string to in buffer */
memcpy(&in[p], s, len);
p += len;
/* Copy expected result for given flags */
if (flags & strings[i].flags) {
s = strings[i].out;
len = strlen(strings[i].out);
}
memcpy(&out_test[q_test], s, len);
q_test += len;
}
in[p++] = '\0';
/* Call string_unescape and compare result */
if (inplace) {
memcpy(out_real, in, p);
if (flags == UNESCAPE_ANY)
q_real = string_unescape_any_inplace(out_real);
else
q_real = string_unescape_inplace(out_real, flags);
} else if (flags == UNESCAPE_ANY) {
q_real = string_unescape_any(in, out_real, q_real);
} else {
q_real = string_unescape(in, out_real, q_real, flags);
}
test_string_check_buf(test, name, flags, in, p - 1, out_real, q_real,
out_test, q_test);
}
struct test_string_1 {
const char *out;
unsigned int flags;
};
#define TEST_STRING_2_MAX_S1 32
struct test_string_2 {
const char *in;
struct test_string_1 s1[TEST_STRING_2_MAX_S1];
};
#define TEST_STRING_2_DICT_0 NULL
static const struct test_string_2 escape0[] = {{
.in = "\f\\ \n\r\t\v",
.s1 = {{
.out = "\\f\\ \\n\\r\\t\\v",
.flags = ESCAPE_SPACE,
},{
.out = "\\f\\134\\040\\n\\r\\t\\v",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
},{
.out = "\\f\\x5c\\x20\\n\\r\\t\\v",
.flags = ESCAPE_SPACE | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\\h\\\"\a\e\\",
.s1 = {{
.out = "\\\\h\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL,
},{
.out = "\\\\\\150\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\\\\\x68\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\eb \\C\007\"\x90\r]",
.s1 = {{
.out = "\eb \\C\007\"\x90\\r]",
.flags = ESCAPE_SPACE,
},{
.out = "\\eb \\\\C\\a\\\"\x90\r]",
.flags = ESCAPE_SPECIAL,
},{
.out = "\\eb \\\\C\\a\\\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL,
},{
.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\015\\135",
.flags = ESCAPE_OCTAL,
},{
.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\r\\135",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
},{
.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\015\\135",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\r\\135",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\eb \\C\007\"\x90\r]",
.flags = ESCAPE_NP,
},{
.out = "\eb \\C\007\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\x90\r]",
.flags = ESCAPE_SPECIAL | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NP,
},{
.out = "\\033b \\C\\007\"\\220\\015]",
.flags = ESCAPE_OCTAL | ESCAPE_NP,
},{
.out = "\\033b \\C\\007\"\\220\\r]",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\\220\\r]",
.flags = ESCAPE_SPECIAL | ESCAPE_SPACE | ESCAPE_OCTAL |
ESCAPE_NP,
},{
.out = "\\x1bb \\C\\x07\"\\x90\\x0d]",
.flags = ESCAPE_NP | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\\220\\317\r",
.flags = ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\\x90\\xcf\r",
.flags = ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NA,
},{
/* terminator */
}}
},{
/* terminator */
}};
#define TEST_STRING_2_DICT_1 "b\\ \t\r\xCF"
static const struct test_string_2 escape1[] = {{
.in = "\f\\ \n\r\t\v",
.s1 = {{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_OCTAL,
},{
.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
.flags = ESCAPE_HEX,
},{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_ANY | ESCAPE_APPEND,
},{
.out = "\\014\\134\\040\\012\\015\\011\\013",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\\x0c\\x5c\\x20\\x0a\\x0d\\x09\\x0b",
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
},{
.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\\h\\\"\a\xCF\e\\",
.s1 = {{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_OCTAL,
},{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_ANY | ESCAPE_APPEND,
},{
.out = "\\134h\\134\"\\007\\317\\033\\134",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\eb \\C\007\"\x90\r]",
.s1 = {{
.out = "\e\\142\\040\\134C\007\"\x90\\015]",
.flags = ESCAPE_OCTAL,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPACE | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPECIAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_ANY | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\\r",
.flags = ESCAPE_SPACE | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPECIAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\015",
.flags = ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\r",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\015",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_ANY | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\x0d",
.flags = ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\r",
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\x0d",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
},{
/* terminator */
}}
},{
/* terminator */
}};
static const struct test_string strings_upper[] = {
{
.in = "abcdefgh1234567890test",
.out = "ABCDEFGH1234567890TEST",
},
{
.in = "abCdeFgH1234567890TesT",
.out = "ABCDEFGH1234567890TEST",
},
};
static const struct test_string strings_lower[] = {
{
.in = "ABCDEFGH1234567890TEST",
.out = "abcdefgh1234567890test",
},
{
.in = "abCdeFgH1234567890TesT",
.out = "abcdefgh1234567890test",
},
};
static const char *test_string_find_match(const struct test_string_2 *s2,
unsigned int flags)
{
const struct test_string_1 *s1 = s2->s1;
unsigned int i;
if (!flags)
return s2->in;
/* Test cases are NULL-aware */
flags &= ~ESCAPE_NULL;
/* ESCAPE_OCTAL has a higher priority */
if (flags & ESCAPE_OCTAL)
flags &= ~ESCAPE_HEX;
for (i = 0; i < TEST_STRING_2_MAX_S1 && s1->out; i++, s1++)
if (s1->flags == flags)
return s1->out;
return NULL;
}
static void
test_string_escape_overflow(struct kunit *test,
const char *in, int p, unsigned int flags, const char *esc,
int q_test, const char *name)
{
int q_real;
q_real = string_escape_mem(in, p, NULL, 0, flags, esc);
KUNIT_EXPECT_EQ_MSG(test, q_real, q_test, "name:%s: flags:%#x", name, flags);
}
static void test_string_escape(struct kunit *test, const char *name,
const struct test_string_2 *s2,
unsigned int flags, const char *esc)
{
size_t out_size = 512;
char *out_test = kunit_kzalloc(test, out_size, GFP_KERNEL);
char *out_real = kunit_kzalloc(test, out_size, GFP_KERNEL);
char *in = kunit_kzalloc(test, 256, GFP_KERNEL);
int p = 0, q_test = 0;
int q_real;
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_test);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_real);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, in);
for (; s2->in; s2++) {
const char *out;
int len;
/* NULL injection */
if (flags & ESCAPE_NULL) {
in[p++] = '\0';
/* '\0' passes isascii() test */
if (flags & ESCAPE_NA && !(flags & ESCAPE_APPEND && esc)) {
out_test[q_test++] = '\0';
} else {
out_test[q_test++] = '\\';
out_test[q_test++] = '0';
}
}
/* Don't try strings that have no output */
out = test_string_find_match(s2, flags);
if (!out)
continue;
/* Copy string to in buffer */
len = strlen(s2->in);
memcpy(&in[p], s2->in, len);
p += len;
/* Copy expected result for given flags */
len = strlen(out);
memcpy(&out_test[q_test], out, len);
q_test += len;
}
q_real = string_escape_mem(in, p, out_real, out_size, flags, esc);
test_string_check_buf(test, name, flags, in, p, out_real, q_real, out_test,
q_test);
test_string_escape_overflow(test, in, p, flags, esc, q_test, name);
}
#define string_get_size_maxbuf 16
#define test_string_get_size_one(size, blk_size, exp_result10, exp_result2) \
do { \
BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf); \
BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf); \
__test_string_get_size(test, (size), (blk_size), (exp_result10), \
(exp_result2)); \
} while (0)
static void test_string_get_size_check(struct kunit *test,
const char *units,
const char *exp,
char *res,
const u64 size,
const u64 blk_size)
{
KUNIT_EXPECT_MEMEQ_MSG(test, res, exp, strlen(exp) + 1,
"string_get_size(size = %llu, blk_size = %llu, units = %s)",
size, blk_size, units);
}
static void __strchrcut(char *dst, const char *src, const char *cut)
{
const char *from = src;
size_t len;
do {
len = strcspn(from, cut);
memcpy(dst, from, len);
dst += len;
from += len;
} while (*from++);
*dst = '\0';
}
static void __test_string_get_size_one(struct kunit *test,
const u64 size, const u64 blk_size,
const char *exp_result10,
const char *exp_result2,
enum string_size_units units,
const char *cut)
{
char buf10[string_get_size_maxbuf];
char buf2[string_get_size_maxbuf];
char exp10[string_get_size_maxbuf];
char exp2[string_get_size_maxbuf];
char prefix10[64];
char prefix2[64];
sprintf(prefix10, "STRING_UNITS_10 [%s]", cut);
sprintf(prefix2, "STRING_UNITS_2 [%s]", cut);
__strchrcut(exp10, exp_result10, cut);
__strchrcut(exp2, exp_result2, cut);
string_get_size(size, blk_size, STRING_UNITS_10 | units, buf10, sizeof(buf10));
string_get_size(size, blk_size, STRING_UNITS_2 | units, buf2, sizeof(buf2));
test_string_get_size_check(test, prefix10, exp10, buf10, size, blk_size);
test_string_get_size_check(test, prefix2, exp2, buf2, size, blk_size);
}
static void __test_string_get_size(struct kunit *test,
const u64 size, const u64 blk_size,
const char *exp_result10,
const char *exp_result2)
{
struct {
enum string_size_units units;
const char *cut;
} get_size_test_cases[] = {
{ 0, "" },
{ STRING_UNITS_NO_SPACE, " " },
{ STRING_UNITS_NO_SPACE | STRING_UNITS_NO_BYTES, " B" },
{ STRING_UNITS_NO_BYTES, "B" },
};
int i;
for (i = 0; i < ARRAY_SIZE(get_size_test_cases); i++)
__test_string_get_size_one(test, size, blk_size,
exp_result10, exp_result2,
get_size_test_cases[i].units,
get_size_test_cases[i].cut);
}
static void test_get_size(struct kunit *test)
{
/* small values */
test_string_get_size_one(0, 512, "0 B", "0 B");
test_string_get_size_one(1, 512, "512 B", "512 B");
test_string_get_size_one(1100, 1, "1.10 kB", "1.07 KiB");
/* normal values */
test_string_get_size_one(16384, 512, "8.39 MB", "8.00 MiB");
test_string_get_size_one(500118192, 512, "256 GB", "238 GiB");
test_string_get_size_one(8192, 4096, "33.6 MB", "32.0 MiB");
/* weird block sizes */
test_string_get_size_one(3000, 1900, "5.70 MB", "5.44 MiB");
/* huge values */
test_string_get_size_one(U64_MAX, 4096, "75.6 ZB", "64.0 ZiB");
test_string_get_size_one(4096, U64_MAX, "75.6 ZB", "64.0 ZiB");
}
static void test_upper_lower(struct kunit *test)
{
char *dst;
int i;
for (i = 0; i < ARRAY_SIZE(strings_upper); i++) {
const char *s = strings_upper[i].in;
int len = strlen(strings_upper[i].in) + 1;
dst = kmalloc(len, GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, dst);
string_upper(dst, s);
KUNIT_EXPECT_STREQ(test, dst, strings_upper[i].out);
kfree(dst);
}
for (i = 0; i < ARRAY_SIZE(strings_lower); i++) {
const char *s = strings_lower[i].in;
int len = strlen(strings_lower[i].in) + 1;
dst = kmalloc(len, GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, dst);
string_lower(dst, s);
KUNIT_EXPECT_STREQ(test, dst, strings_lower[i].out);
kfree(dst);
}
}
static void test_unescape(struct kunit *test)
{
unsigned int i;
for (i = 0; i < UNESCAPE_ALL_MASK + 1; i++)
test_string_unescape(test, "unescape", i, false);
test_string_unescape(test, "unescape inplace",
get_random_u32_below(UNESCAPE_ALL_MASK + 1), true);
/* Without dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)
test_string_escape(test, "escape 0", escape0, i, TEST_STRING_2_DICT_0);
/* With dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)
test_string_escape(test, "escape 1", escape1, i, TEST_STRING_2_DICT_1);
}
static struct kunit_case string_helpers_test_cases[] = {
KUNIT_CASE(test_get_size),
KUNIT_CASE(test_upper_lower),
KUNIT_CASE(test_unescape),
{}
};
static struct kunit_suite string_helpers_test_suite = {
.name = "string_helpers",
.test_cases = string_helpers_test_cases,
};
kunit_test_suites(&string_helpers_test_suite);
MODULE_DESCRIPTION("Test cases for string helpers module");
MODULE_LICENSE("Dual BSD/GPL");
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