[PATCH v3 1/2] string: Convert selftest to KUnit
From: Kees Cook
Date: Fri Mar 01 2024 - 15:27:51 EST
Convert test_string.c to KUnit so it can be easily run with everything
else.
Additional text context is retained for failure reporting. For example,
when forcing a bad match, we can see the loop counters reported for the
memset() tests:
[09:21:52] # test_memset64: ASSERTION FAILED at lib/string_kunit.c:93
[09:21:52] Expected v == 0xa2a1a1a1a1a1a1a1ULL, but
[09:21:52] v == -6799976246779207263 (0xa1a1a1a1a1a1a1a1)
[09:21:52] 0xa2a1a1a1a1a1a1a1ULL == -6727918652741279327 (0xa2a1a1a1a1a1a1a1)
[09:21:52] i:0 j:0 k:0
[09:21:52] [FAILED] test_memset64
Currently passes without problems:
$ ./tools/testing/kunit/kunit.py run string
..
[09:37:40] Starting KUnit Kernel (1/1)...
[09:37:40] ============================================================
[09:37:40] =================== string (6 subtests) ====================
[09:37:40] [PASSED] test_memset16
[09:37:40] [PASSED] test_memset32
[09:37:40] [PASSED] test_memset64
[09:37:40] [PASSED] test_strchr
[09:37:40] [PASSED] test_strnchr
[09:37:40] [PASSED] test_strspn
[09:37:40] ===================== [PASSED] string ======================
[09:37:40] ============================================================
[09:37:40] Testing complete. Ran 6 tests: passed: 6
[09:37:40] Elapsed time: 6.730s total, 0.001s configuring, 6.562s building, 0.131s running
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
Cc: Andy Shevchenko <andy@xxxxxxxxxx>
---
MAINTAINERS | 2 +-
lib/Kconfig.debug | 6 +-
lib/Makefile | 2 +-
lib/{test_string.c => string_kunit.c} | 200 +++++++++-----------------
4 files changed, 77 insertions(+), 133 deletions(-)
rename lib/{test_string.c => string_kunit.c} (46%)
diff --git a/MAINTAINERS b/MAINTAINERS
index cd651c4df019..9f1f68cccd6a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8976,9 +8976,9 @@ F: include/linux/string.h
F: include/linux/string_choices.h
F: include/linux/string_helpers.h
F: lib/string.c
+F: lib/string_kunit.c
F: lib/string_helpers.c
F: lib/test-string_helpers.c
-F: lib/test_string.c
F: scripts/coccinelle/api/string_choices.cocci
GENERIC UIO DRIVER FOR PCI DEVICES
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4e2febe3b568..406cdf353488 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2352,8 +2352,10 @@ config ASYNC_RAID6_TEST
config TEST_HEXDUMP
tristate "Test functions located in the hexdump module at runtime"
-config STRING_SELFTEST
- tristate "Test string functions at runtime"
+config STRING_KUNIT_TEST
+ tristate "KUnit test string functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
config TEST_STRING_HELPERS
tristate "Test functions located in the string_helpers module at runtime"
diff --git a/lib/Makefile b/lib/Makefile
index eae87c41b22b..946277c37831 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -49,7 +49,7 @@ obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \
percpu-refcount.o rhashtable.o base64.o \
once.o refcount.o rcuref.o usercopy.o errseq.o bucket_locks.o \
generic-radix-tree.o bitmap-str.o
-obj-$(CONFIG_STRING_SELFTEST) += test_string.o
+obj-$(CONFIG_STRING_KUNIT_TEST) += string_kunit.o
obj-y += string_helpers.o
obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
obj-y += hexdump.o
diff --git a/lib/test_string.c b/lib/string_kunit.c
similarity index 46%
rename from lib/test_string.c
rename to lib/string_kunit.c
index c5cb92fb710e..15551200d858 100644
--- a/lib/test_string.c
+++ b/lib/string_kunit.c
@@ -1,17 +1,23 @@
// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Test cases for string functions.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <kunit/test.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>
-static __init int memset16_selftest(void)
+static void test_memset16(struct kunit *test)
{
unsigned i, j, k;
u16 v, *p;
- p = kmalloc(256 * 2 * 2, GFP_KERNEL);
- if (!p)
- return -1;
+ p = kunit_kzalloc(test, 256 * 2 * 2, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
for (i = 0; i < 256; i++) {
for (j = 0; j < 256; j++) {
@@ -20,34 +26,27 @@ static __init int memset16_selftest(void)
for (k = 0; k < 512; k++) {
v = p[k];
if (k < i) {
- if (v != 0xa1a1)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1,
+ "i:%d j:%d k:%d", i, j, k);
} else if (k < i + j) {
- if (v != 0xb1b2)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2,
+ "i:%d j:%d k:%d", i, j, k);
} else {
- if (v != 0xa1a1)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1,
+ "i:%d j:%d k:%d", i, j, k);
}
}
}
}
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k | 0x8000;
- return 0;
}
-static __init int memset32_selftest(void)
+static void test_memset32(struct kunit *test)
{
unsigned i, j, k;
u32 v, *p;
- p = kmalloc(256 * 2 * 4, GFP_KERNEL);
- if (!p)
- return -1;
+ p = kunit_kzalloc(test, 256 * 2 * 4, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
for (i = 0; i < 256; i++) {
for (j = 0; j < 256; j++) {
@@ -56,34 +55,27 @@ static __init int memset32_selftest(void)
for (k = 0; k < 512; k++) {
v = p[k];
if (k < i) {
- if (v != 0xa1a1a1a1)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1,
+ "i:%d j:%d k:%d", i, j, k);
} else if (k < i + j) {
- if (v != 0xb1b2b3b4)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2b3b4,
+ "i:%d j:%d k:%d", i, j, k);
} else {
- if (v != 0xa1a1a1a1)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1,
+ "i:%d j:%d k:%d", i, j, k);
}
}
}
}
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k | 0x8000;
- return 0;
}
-static __init int memset64_selftest(void)
+static void test_memset64(struct kunit *test)
{
unsigned i, j, k;
u64 v, *p;
- p = kmalloc(256 * 2 * 8, GFP_KERNEL);
- if (!p)
- return -1;
+ p = kunit_kzalloc(test, 256 * 2 * 8, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
for (i = 0; i < 256; i++) {
for (j = 0; j < 256; j++) {
@@ -92,27 +84,21 @@ static __init int memset64_selftest(void)
for (k = 0; k < 512; k++) {
v = p[k];
if (k < i) {
- if (v != 0xa1a1a1a1a1a1a1a1ULL)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1a1a1a1a1ULL,
+ "i:%d j:%d k:%d", i, j, k);
} else if (k < i + j) {
- if (v != 0xb1b2b3b4b5b6b7b8ULL)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2b3b4b5b6b7b8ULL,
+ "i:%d j:%d k:%d", i, j, k);
} else {
- if (v != 0xa1a1a1a1a1a1a1a1ULL)
- goto fail;
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1a1a1a1a1ULL,
+ "i:%d j:%d k:%d", i, j, k);
}
}
}
}
-
-fail:
- kfree(p);
- if (i < 256)
- return (i << 24) | (j << 16) | k | 0x8000;
- return 0;
}
-static __init int strchr_selftest(void)
+static void test_strchr(struct kunit *test)
{
const char *test_string = "abcdefghijkl";
const char *empty_string = "";
@@ -121,26 +107,21 @@ static __init int strchr_selftest(void)
for (i = 0; i < strlen(test_string) + 1; i++) {
result = strchr(test_string, test_string[i]);
- if (result - test_string != i)
- return i + 'a';
+ KUNIT_ASSERT_EQ_MSG(test, result - test_string, i,
+ "char:%c", 'a' + i);
}
result = strchr(empty_string, '\0');
- if (result != empty_string)
- return 0x101;
+ KUNIT_ASSERT_PTR_EQ(test, result, empty_string);
result = strchr(empty_string, 'a');
- if (result)
- return 0x102;
+ KUNIT_ASSERT_NULL(test, result);
result = strchr(test_string, 'z');
- if (result)
- return 0x103;
-
- return 0;
+ KUNIT_ASSERT_NULL(test, result);
}
-static __init int strnchr_selftest(void)
+static void test_strnchr(struct kunit *test)
{
const char *test_string = "abcdefghijkl";
const char *empty_string = "";
@@ -151,35 +132,29 @@ static __init int strnchr_selftest(void)
for (j = 0; j < strlen(test_string) + 2; j++) {
result = strnchr(test_string, j, test_string[i]);
if (j <= i) {
- if (!result)
- continue;
- return ((i + 'a') << 8) | j;
+ KUNIT_ASSERT_NULL_MSG(test, result,
+ "char:%c i:%d j:%d", 'a' + i, i, j);
+ } else {
+ KUNIT_ASSERT_EQ_MSG(test, result - test_string, i,
+ "char:%c i:%d j:%d", 'a' + i, i, j);
}
- if (result - test_string != i)
- return ((i + 'a') << 8) | j;
}
}
result = strnchr(empty_string, 0, '\0');
- if (result)
- return 0x10001;
+ KUNIT_ASSERT_NULL(test, result);
result = strnchr(empty_string, 1, '\0');
- if (result != empty_string)
- return 0x10002;
+ KUNIT_ASSERT_PTR_EQ(test, result, empty_string);
result = strnchr(empty_string, 1, 'a');
- if (result)
- return 0x10003;
+ KUNIT_ASSERT_NULL(test, result);
result = strnchr(NULL, 0, '\0');
- if (result)
- return 0x10004;
-
- return 0;
+ KUNIT_ASSERT_NULL(test, result);
}
-static __init int strspn_selftest(void)
+static void test_strspn(struct kunit *test)
{
static const struct strspn_test {
const char str[16];
@@ -187,71 +162,38 @@ static __init int strspn_selftest(void)
const char reject[16];
unsigned a;
unsigned r;
- } tests[] __initconst = {
+ } tests[] = {
{ "foobar", "", "", 0, 6 },
{ "abba", "abc", "ABBA", 4, 4 },
{ "abba", "a", "b", 1, 1 },
{ "", "abc", "abc", 0, 0},
};
const struct strspn_test *s = tests;
- size_t i, res;
+ size_t i;
for (i = 0; i < ARRAY_SIZE(tests); ++i, ++s) {
- res = strspn(s->str, s->accept);
- if (res != s->a)
- return 0x100 + 2*i;
- res = strcspn(s->str, s->reject);
- if (res != s->r)
- return 0x100 + 2*i + 1;
+ KUNIT_ASSERT_EQ_MSG(test, s->a, strspn(s->str, s->accept),
+ "i:%d", i);
+ KUNIT_ASSERT_EQ_MSG(test, s->r, strcspn(s->str, s->reject),
+ "i:%d", i);
}
- return 0;
}
-static __exit void string_selftest_remove(void)
-{
-}
+static struct kunit_case string_test_cases[] = {
+ KUNIT_CASE(test_memset16),
+ KUNIT_CASE(test_memset32),
+ KUNIT_CASE(test_memset64),
+ KUNIT_CASE(test_strchr),
+ KUNIT_CASE(test_strnchr),
+ KUNIT_CASE(test_strspn),
+ {}
+};
-static __init int string_selftest_init(void)
-{
- int test, subtest;
-
- test = 1;
- subtest = memset16_selftest();
- if (subtest)
- goto fail;
-
- test = 2;
- subtest = memset32_selftest();
- if (subtest)
- goto fail;
-
- test = 3;
- subtest = memset64_selftest();
- if (subtest)
- goto fail;
+static struct kunit_suite string_test_suite = {
+ .name = "string",
+ .test_cases = string_test_cases,
+};
- test = 4;
- subtest = strchr_selftest();
- if (subtest)
- goto fail;
-
- test = 5;
- subtest = strnchr_selftest();
- if (subtest)
- goto fail;
-
- test = 6;
- subtest = strspn_selftest();
- if (subtest)
- goto fail;
-
- pr_info("String selftests succeeded\n");
- return 0;
-fail:
- pr_crit("String selftest failure %d.%08x\n", test, subtest);
- return 0;
-}
+kunit_test_suites(&string_test_suite);
-module_init(string_selftest_init);
-module_exit(string_selftest_remove);
MODULE_LICENSE("GPL v2");
--
2.34.1