Convert overflow unit tests to KUnit, for better integration into the
kernel self test framework. Includes a rename of test_overflow.c to
overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
$ ./tools/testing/kunit/kunit.py config
...
$ ./tools/testing/kunit/kunit.py run overflow
...
[14:33:51] Starting KUnit Kernel (1/1)...
[14:33:51] ============================================================
[14:33:51] ================== overflow (11 subtests) ==================
[14:33:51] [PASSED] u8_overflow_test
[14:33:51] [PASSED] s8_overflow_test
[14:33:51] [PASSED] u16_overflow_test
[14:33:51] [PASSED] s16_overflow_test
[14:33:51] [PASSED] u32_overflow_test
[14:33:51] [PASSED] s32_overflow_test
[14:33:51] [PASSED] u64_overflow_test
[14:33:51] [PASSED] s64_overflow_test
[14:33:51] [PASSED] overflow_shift_test
[14:33:51] [PASSED] overflow_allocation_test
[14:33:51] [PASSED] overflow_size_helpers_test
[14:33:51] ==================== [PASSED] overflow =====================
[14:33:51] ============================================================
[14:33:51] Testing complete. Passed: 11, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0
[14:33:51] Elapsed time: 12.525s total, 0.001s configuring, 12.402s building, 0.101s running
Cc: David Gow <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Co-developed-by: Vitor Massaru Iha <[email protected]>
Signed-off-by: Vitor Massaru Iha <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
Co-developed-by: Daniel Latypov <[email protected]>
Signed-off-by: Daniel Latypov <[email protected]>
Link: https://lore.kernel.org/linux-kselftest/[email protected]/
Acked-by: Nick Desaulniers <[email protected]>
Link: https://lore.kernel.org/lkml/CAKwvOdm62iA1dNiC6Q11UJ-MnTqtc4kXkm-ubPaFMK824_k0nw@mail.gmail.com
Signed-off-by: Kees Cook <[email protected]>
---
v1: https://lore.kernel.org/lkml/[email protected]/
v2: Fixed up the authorship more, pulled in other prior changes (Daniel)
---
lib/Kconfig.debug | 16 +-
lib/Makefile | 2 +-
lib/{test_overflow.c => overflow_kunit.c} | 555 ++++++++++------------
3 files changed, 264 insertions(+), 309 deletions(-)
rename lib/{test_overflow.c => overflow_kunit.c} (54%)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 14b89aa37c5c..14d90d03bc8d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2214,9 +2214,6 @@ config TEST_UUID
config TEST_XARRAY
tristate "Test the XArray code at runtime"
-config TEST_OVERFLOW
- tristate "Test check_*_overflow() functions at runtime"
-
config TEST_RHASHTABLE
tristate "Perform selftest on resizable hash table"
help
@@ -2501,6 +2498,19 @@ config MEMCPY_KUNIT_TEST
If unsure, say N.
+config OVERFLOW_KUNIT_TEST
+ tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for the check_*_overflow(), size_*(), allocation, and
+ related functions.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config TEST_UDELAY
tristate "udelay test driver"
help
diff --git a/lib/Makefile b/lib/Makefile
index 300f569c626b..fdfcbfaff32f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -77,7 +77,6 @@ obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
obj-$(CONFIG_TEST_MIN_HEAP) += test_min_heap.o
obj-$(CONFIG_TEST_LKM) += test_module.o
obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
-obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o
obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
obj-$(CONFIG_TEST_SORT) += test_sort.o
obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
@@ -363,6 +362,7 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o
obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
+obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
diff --git a/lib/test_overflow.c b/lib/overflow_kunit.c
similarity index 54%
rename from lib/test_overflow.c
rename to lib/overflow_kunit.c
index f6530fce799d..835b1a312c76 100644
--- a/lib/test_overflow.c
+++ b/lib/overflow_kunit.c
@@ -1,11 +1,14 @@
// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
- * Test cases for arithmetic overflow checks.
+ * Test cases for arithmetic overflow checks. See:
+ * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
+ * ./tools/testing/kunit/kunit.py config
+ * ./tools/testing/kunit/kunit.py run overflow [--raw_output]
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <kunit/test.h>
#include <linux/device.h>
-#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -19,7 +22,7 @@
t a, b; \
t sum, diff, prod; \
bool s_of, d_of, p_of; \
- } t ## _tests[] __initconst
+ } t ## _tests[]
DEFINE_TEST_ARRAY(u8) = {
{0, 0, 0, 0, 0, false, false, false},
@@ -220,43 +223,31 @@ DEFINE_TEST_ARRAY(s64) = {
bool _of; \
\
_of = check_ ## op ## _overflow(a, b, &_r); \
- if (_of != of) { \
- pr_warn("expected "fmt" "sym" "fmt \
- " to%s overflow (type %s)\n", \
- a, b, of ? "" : " not", #t); \
- err = 1; \
- } \
- if (_r != r) { \
- pr_warn("expected "fmt" "sym" "fmt" == " \
- fmt", got "fmt" (type %s)\n", \
- a, b, r, _r, #t); \
- err = 1; \
- } \
+ KUNIT_EXPECT_EQ_MSG(test, _of, of, \
+ "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \
+ a, b, of ? "" : " not", #t); \
+ KUNIT_EXPECT_EQ_MSG(test, _r, r, \
+ "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \
+ a, b, r, _r, #t); \
} while (0)
#define DEFINE_TEST_FUNC(t, fmt) \
-static int __init do_test_ ## t(const struct test_ ## t *p) \
+static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \
{ \
- int err = 0; \
- \
check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
- \
- return err; \
} \
\
-static int __init test_ ## t ## _overflow(void) { \
- int err = 0; \
+static void t ## _overflow_test(struct kunit *test) { \
unsigned i; \
\
for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
- err |= do_test_ ## t(&t ## _tests[i]); \
- pr_info("%zu %s arithmetic tests finished\n", \
+ do_test_ ## t(test, &t ## _tests[i]); \
+ kunit_info(test, "%zu %s arithmetic tests finished\n", \
ARRAY_SIZE(t ## _tests), #t); \
- return err; \
}
DEFINE_TEST_FUNC(u8, "%d");
@@ -270,198 +261,176 @@ DEFINE_TEST_FUNC(u64, "%llu");
DEFINE_TEST_FUNC(s64, "%lld");
#endif
-static int __init test_overflow_calculation(void)
+static void overflow_shift_test(struct kunit *test)
{
- int err = 0;
-
- err |= test_u8_overflow();
- err |= test_s8_overflow();
- err |= test_u16_overflow();
- err |= test_s16_overflow();
- err |= test_u32_overflow();
- err |= test_s32_overflow();
-#if BITS_PER_LONG == 64
- err |= test_u64_overflow();
- err |= test_s64_overflow();
-#endif
-
- return err;
-}
-
-static int __init test_overflow_shift(void)
-{
- int err = 0;
int count = 0;
/* Args are: value, shift, type, expected result, overflow expected */
-#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \
- int __failed = 0; \
+#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
typeof(a) __a = (a); \
typeof(s) __s = (s); \
t __e = (expect); \
t __d; \
bool __of = check_shl_overflow(__a, __s, &__d); \
if (__of != of) { \
- pr_warn("expected (%s)(%s << %s) to%s overflow\n", \
+ KUNIT_EXPECT_EQ_MSG(test, __of, of, \
+ "expected (%s)(%s << %s) to%s overflow\n", \
#t, #a, #s, of ? "" : " not"); \
- __failed = 1; \
} else if (!__of && __d != __e) { \
- pr_warn("expected (%s)(%s << %s) == %s\n", \
+ KUNIT_EXPECT_EQ_MSG(test, __d, __e, \
+ "expected (%s)(%s << %s) == %s\n", \
#t, #a, #s, #expect); \
if ((t)-1 < 0) \
- pr_warn("got %lld\n", (s64)__d); \
+ kunit_info(test, "got %lld\n", (s64)__d); \
else \
- pr_warn("got %llu\n", (u64)__d); \
- __failed = 1; \
+ kunit_info(test, "got %llu\n", (u64)__d); \
} \
count++; \
- __failed; \
-})
+} while (0)
/* Sane shifts. */
- err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
- err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
- err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
- err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
- err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
- err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
- err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
- err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
- err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
- err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
- err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
- err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
- err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
- err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
- err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
- err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
- err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
- err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
- err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
- err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
- err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
- err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64,
- 0xFFFFFFFFULL << 32, false);
+ TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
+ TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
+ TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
+ TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
+ TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
+ TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
+ TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
+ TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
+ TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
+ TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
+ TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
+ TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
+ TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
+ TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
+ TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
+ TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
+ TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
+ TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
+ TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
+ TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
+ TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
+ TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
+ TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false);
/* Sane shift: start and end with 0, without a too-wide shift. */
- err |= TEST_ONE_SHIFT(0, 7, u8, 0, false);
- err |= TEST_ONE_SHIFT(0, 15, u16, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, u32, 0, false);
- err |= TEST_ONE_SHIFT(0, 63, u64, 0, false);
+ TEST_ONE_SHIFT(0, 7, u8, 0, false);
+ TEST_ONE_SHIFT(0, 15, u16, 0, false);
+ TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
+ TEST_ONE_SHIFT(0, 31, u32, 0, false);
+ TEST_ONE_SHIFT(0, 63, u64, 0, false);
/* Sane shift: start and end with 0, without reaching signed bit. */
- err |= TEST_ONE_SHIFT(0, 6, s8, 0, false);
- err |= TEST_ONE_SHIFT(0, 14, s16, 0, false);
- err |= TEST_ONE_SHIFT(0, 30, int, 0, false);
- err |= TEST_ONE_SHIFT(0, 30, s32, 0, false);
- err |= TEST_ONE_SHIFT(0, 62, s64, 0, false);
+ TEST_ONE_SHIFT(0, 6, s8, 0, false);
+ TEST_ONE_SHIFT(0, 14, s16, 0, false);
+ TEST_ONE_SHIFT(0, 30, int, 0, false);
+ TEST_ONE_SHIFT(0, 30, s32, 0, false);
+ TEST_ONE_SHIFT(0, 62, s64, 0, false);
/* Overflow: shifted the bit off the end. */
- err |= TEST_ONE_SHIFT(1, 8, u8, 0, true);
- err |= TEST_ONE_SHIFT(1, 16, u16, 0, true);
- err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(1, 32, u32, 0, true);
- err |= TEST_ONE_SHIFT(1, 64, u64, 0, true);
+ TEST_ONE_SHIFT(1, 8, u8, 0, true);
+ TEST_ONE_SHIFT(1, 16, u16, 0, true);
+ TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
+ TEST_ONE_SHIFT(1, 32, u32, 0, true);
+ TEST_ONE_SHIFT(1, 64, u64, 0, true);
/* Overflow: shifted into the signed bit. */
- err |= TEST_ONE_SHIFT(1, 7, s8, 0, true);
- err |= TEST_ONE_SHIFT(1, 15, s16, 0, true);
- err |= TEST_ONE_SHIFT(1, 31, int, 0, true);
- err |= TEST_ONE_SHIFT(1, 31, s32, 0, true);
- err |= TEST_ONE_SHIFT(1, 63, s64, 0, true);
+ TEST_ONE_SHIFT(1, 7, s8, 0, true);
+ TEST_ONE_SHIFT(1, 15, s16, 0, true);
+ TEST_ONE_SHIFT(1, 31, int, 0, true);
+ TEST_ONE_SHIFT(1, 31, s32, 0, true);
+ TEST_ONE_SHIFT(1, 63, s64, 0, true);
/* Overflow: high bit falls off unsigned types. */
/* 10010110 */
- err |= TEST_ONE_SHIFT(150, 1, u8, 0, true);
+ TEST_ONE_SHIFT(150, 1, u8, 0, true);
/* 1000100010010110 */
- err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true);
+ TEST_ONE_SHIFT(34966, 1, u16, 0, true);
/* 10000100000010001000100010010110 */
- err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
- err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
+ TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
+ TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
/* 1000001000010000010000000100000010000100000010001000100010010110 */
- err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
+ TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
/* Overflow: bit shifted into signed bit on signed types. */
/* 01001011 */
- err |= TEST_ONE_SHIFT(75, 1, s8, 0, true);
+ TEST_ONE_SHIFT(75, 1, s8, 0, true);
/* 0100010001001011 */
- err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true);
+ TEST_ONE_SHIFT(17483, 1, s16, 0, true);
/* 01000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
- err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
+ TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
+ TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
/* 0100000100001000001000000010000001000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
+ TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
/* Overflow: bit shifted past signed bit on signed types. */
/* 01001011 */
- err |= TEST_ONE_SHIFT(75, 2, s8, 0, true);
+ TEST_ONE_SHIFT(75, 2, s8, 0, true);
/* 0100010001001011 */
- err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true);
+ TEST_ONE_SHIFT(17483, 2, s16, 0, true);
/* 01000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
- err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
+ TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
+ TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
/* 0100000100001000001000000010000001000010000001000100010001001011 */
- err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
+ TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
/* Overflow: values larger than destination type. */
- err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
- err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
- err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
- err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
- err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
- err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
+ TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
+ TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
+ TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
+ TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
+ TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
+ TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
+ TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
/* Nonsense: negative initial value. */
- err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true);
- err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true);
- err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true);
- err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true);
- err |= TEST_ONE_SHIFT(-10, 0, int, 0, true);
- err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true);
- err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true);
- err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
- err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
+ TEST_ONE_SHIFT(-1, 0, s8, 0, true);
+ TEST_ONE_SHIFT(-1, 0, u8, 0, true);
+ TEST_ONE_SHIFT(-5, 0, s16, 0, true);
+ TEST_ONE_SHIFT(-5, 0, u16, 0, true);
+ TEST_ONE_SHIFT(-10, 0, int, 0, true);
+ TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
+ TEST_ONE_SHIFT(-100, 0, s32, 0, true);
+ TEST_ONE_SHIFT(-100, 0, u32, 0, true);
+ TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
+ TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
/* Nonsense: negative shift values. */
- err |= TEST_ONE_SHIFT(0, -5, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, -5, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, -10, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, -10, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, -15, int, 0, true);
- err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
- err |= TEST_ONE_SHIFT(0, -20, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, -20, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, -30, s64, 0, true);
- err |= TEST_ONE_SHIFT(0, -30, u64, 0, true);
+ TEST_ONE_SHIFT(0, -5, s8, 0, true);
+ TEST_ONE_SHIFT(0, -5, u8, 0, true);
+ TEST_ONE_SHIFT(0, -10, s16, 0, true);
+ TEST_ONE_SHIFT(0, -10, u16, 0, true);
+ TEST_ONE_SHIFT(0, -15, int, 0, true);
+ TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
+ TEST_ONE_SHIFT(0, -20, s32, 0, true);
+ TEST_ONE_SHIFT(0, -20, u32, 0, true);
+ TEST_ONE_SHIFT(0, -30, s64, 0, true);
+ TEST_ONE_SHIFT(0, -30, u64, 0, true);
/* Overflow: shifted at or beyond entire type's bit width. */
- err |= TEST_ONE_SHIFT(0, 8, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, 9, u8, 0, true);
- err |= TEST_ONE_SHIFT(0, 8, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, 9, s8, 0, true);
- err |= TEST_ONE_SHIFT(0, 16, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, 17, u16, 0, true);
- err |= TEST_ONE_SHIFT(0, 16, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, 17, s16, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, u32, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, int, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, int, 0, true);
- err |= TEST_ONE_SHIFT(0, 32, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, 33, s32, 0, true);
- err |= TEST_ONE_SHIFT(0, 64, u64, 0, true);
- err |= TEST_ONE_SHIFT(0, 65, u64, 0, true);
- err |= TEST_ONE_SHIFT(0, 64, s64, 0, true);
- err |= TEST_ONE_SHIFT(0, 65, s64, 0, true);
+ TEST_ONE_SHIFT(0, 8, u8, 0, true);
+ TEST_ONE_SHIFT(0, 9, u8, 0, true);
+ TEST_ONE_SHIFT(0, 8, s8, 0, true);
+ TEST_ONE_SHIFT(0, 9, s8, 0, true);
+ TEST_ONE_SHIFT(0, 16, u16, 0, true);
+ TEST_ONE_SHIFT(0, 17, u16, 0, true);
+ TEST_ONE_SHIFT(0, 16, s16, 0, true);
+ TEST_ONE_SHIFT(0, 17, s16, 0, true);
+ TEST_ONE_SHIFT(0, 32, u32, 0, true);
+ TEST_ONE_SHIFT(0, 33, u32, 0, true);
+ TEST_ONE_SHIFT(0, 32, int, 0, true);
+ TEST_ONE_SHIFT(0, 33, int, 0, true);
+ TEST_ONE_SHIFT(0, 32, s32, 0, true);
+ TEST_ONE_SHIFT(0, 33, s32, 0, true);
+ TEST_ONE_SHIFT(0, 64, u64, 0, true);
+ TEST_ONE_SHIFT(0, 65, u64, 0, true);
+ TEST_ONE_SHIFT(0, 64, s64, 0, true);
+ TEST_ONE_SHIFT(0, 65, s64, 0, true);
/*
* Corner case: for unsigned types, we fail when we've shifted
@@ -472,17 +441,14 @@ static int __init test_overflow_shift(void)
* signed bit). So, for now, we will test this condition but
* mark it as not expected to overflow.
*/
- err |= TEST_ONE_SHIFT(0, 7, s8, 0, false);
- err |= TEST_ONE_SHIFT(0, 15, s16, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, int, 0, false);
- err |= TEST_ONE_SHIFT(0, 31, s32, 0, false);
- err |= TEST_ONE_SHIFT(0, 63, s64, 0, false);
-
- pr_info("%d shift tests finished\n", count);
+ TEST_ONE_SHIFT(0, 7, s8, 0, false);
+ TEST_ONE_SHIFT(0, 15, s16, 0, false);
+ TEST_ONE_SHIFT(0, 31, int, 0, false);
+ TEST_ONE_SHIFT(0, 31, s32, 0, false);
+ TEST_ONE_SHIFT(0, 63, s64, 0, false);
+ kunit_info(test, "%d shift tests finished\n", count);
#undef TEST_ONE_SHIFT
-
- return err;
}
/*
@@ -502,7 +468,7 @@ static int __init test_overflow_shift(void)
#define TEST_SIZE (5 * 4096)
#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
-static int __init test_ ## func (void *arg) \
+static void test_ ## func (struct kunit *test, void *arg) \
{ \
volatile size_t a = TEST_SIZE; \
volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \
@@ -510,30 +476,24 @@ static int __init test_ ## func (void *arg) \
\
/* Tiny allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
- if (!ptr) { \
- pr_warn(#func " failed regular allocation?!\n"); \
- return 1; \
- } \
+ KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
+ #func " failed regular allocation?!\n"); \
free ## want_arg (free_func, arg, ptr); \
\
/* Wrapped allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
a * b); \
- if (!ptr) { \
- pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \
- return 1; \
- } \
+ KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
+ #func " unexpectedly failed bad wrapping?!\n"); \
free ## want_arg (free_func, arg, ptr); \
\
/* Saturated allocation test. */ \
ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
array_size(a, b)); \
if (ptr) { \
- pr_warn(#func " missed saturation!\n"); \
+ KUNIT_FAIL(test, #func " missed saturation!\n"); \
free ## want_arg (free_func, arg, ptr); \
- return 1; \
} \
- return 0; \
}
/*
@@ -554,44 +514,38 @@ DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1);
DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0);
DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0);
-static int __init test_overflow_allocation(void)
+static void overflow_allocation_test(struct kunit *test)
{
const char device_name[] = "overflow-test";
struct device *dev;
int count = 0;
- int err = 0;
-#define check_allocation_overflow(alloc) ({ \
+#define check_allocation_overflow(alloc) do { \
count++; \
- test_ ## alloc(dev); \
-})
+ test_ ## alloc(test, dev); \
+} while (0)
/* Create dummy device for devm_kmalloc()-family tests. */
dev = root_device_register(device_name);
- if (IS_ERR(dev)) {
- pr_warn("Cannot register test device\n");
- return 1;
- }
-
- err |= check_allocation_overflow(kmalloc);
- err |= check_allocation_overflow(kmalloc_node);
- err |= check_allocation_overflow(kzalloc);
- err |= check_allocation_overflow(kzalloc_node);
- err |= check_allocation_overflow(__vmalloc);
- err |= check_allocation_overflow(kvmalloc);
- err |= check_allocation_overflow(kvmalloc_node);
- err |= check_allocation_overflow(kvzalloc);
- err |= check_allocation_overflow(kvzalloc_node);
- err |= check_allocation_overflow(devm_kmalloc);
- err |= check_allocation_overflow(devm_kzalloc);
+ KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
+ "Cannot register test device\n");
+
+ check_allocation_overflow(kmalloc);
+ check_allocation_overflow(kmalloc_node);
+ check_allocation_overflow(kzalloc);
+ check_allocation_overflow(kzalloc_node);
+ check_allocation_overflow(__vmalloc);
+ check_allocation_overflow(kvmalloc);
+ check_allocation_overflow(kvmalloc_node);
+ check_allocation_overflow(kvzalloc);
+ check_allocation_overflow(kvzalloc_node);
+ check_allocation_overflow(devm_kmalloc);
+ check_allocation_overflow(devm_kzalloc);
device_unregister(dev);
- pr_info("%d allocation overflow tests finished\n", count);
-
+ kunit_info(test, "%d allocation overflow tests finished\n", count);
#undef check_allocation_overflow
-
- return err;
}
struct __test_flex_array {
@@ -600,127 +554,118 @@ struct __test_flex_array {
unsigned long data[];
};
-static int __init test_overflow_size_helpers(void)
+static void overflow_size_helpers_test(struct kunit *test)
{
/* Make sure struct_size() can be used in a constant expression. */
u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
struct __test_flex_array *obj;
int count = 0;
- int err = 0;
int var;
volatile int unconst = 0;
/* Verify constant expression against runtime version. */
var = 55;
OPTIMIZER_HIDE_VAR(var);
- err |= sizeof(ce_array) != struct_size(obj, data, var);
+ KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var));
-#define check_one_size_helper(expected, func, args...) ({ \
- bool __failure = false; \
- size_t _r; \
- \
- _r = func(args); \
- if (_r != (expected)) { \
- pr_warn("expected " #func "(" #args ") " \
- "to return %zu but got %zu instead\n", \
- (size_t)(expected), _r); \
- __failure = true; \
- } \
+#define check_one_size_helper(expected, func, args...) do { \
+ size_t _r = func(args); \
+ KUNIT_EXPECT_EQ_MSG(test, _r, expected, \
+ "expected " #func "(" #args ") to return %zu but got %zu instead\n", \
+ (size_t)(expected), _r); \
count++; \
- __failure; \
-})
+} while (0)
var = 4;
- err |= check_one_size_helper(20, size_mul, var++, 5);
- err |= check_one_size_helper(20, size_mul, 4, var++);
- err |= check_one_size_helper(0, size_mul, 0, 3);
- err |= check_one_size_helper(0, size_mul, 3, 0);
- err |= check_one_size_helper(6, size_mul, 2, 3);
- err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
- err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
- err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
+ check_one_size_helper(20, size_mul, var++, 5);
+ check_one_size_helper(20, size_mul, 4, var++);
+ check_one_size_helper(0, size_mul, 0, 3);
+ check_one_size_helper(0, size_mul, 3, 0);
+ check_one_size_helper(6, size_mul, 2, 3);
+ check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
+ check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
+ check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
var = 4;
- err |= check_one_size_helper(9, size_add, var++, 5);
- err |= check_one_size_helper(9, size_add, 4, var++);
- err |= check_one_size_helper(9, size_add, 9, 0);
- err |= check_one_size_helper(9, size_add, 0, 9);
- err |= check_one_size_helper(5, size_add, 2, 3);
- err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
- err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
- err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
+ check_one_size_helper(9, size_add, var++, 5);
+ check_one_size_helper(9, size_add, 4, var++);
+ check_one_size_helper(9, size_add, 9, 0);
+ check_one_size_helper(9, size_add, 0, 9);
+ check_one_size_helper(5, size_add, 2, 3);
+ check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
+ check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
+ check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
var = 4;
- err |= check_one_size_helper(1, size_sub, var--, 3);
- err |= check_one_size_helper(1, size_sub, 4, var--);
- err |= check_one_size_helper(1, size_sub, 3, 2);
- err |= check_one_size_helper(9, size_sub, 9, 0);
- err |= check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
- err |= check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
- err |= check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
- err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
- err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
- err |= check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
- err |= check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
- err |= check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
- err |= check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
- err |= check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
+ check_one_size_helper(1, size_sub, var--, 3);
+ check_one_size_helper(1, size_sub, 4, var--);
+ check_one_size_helper(1, size_sub, 3, 2);
+ check_one_size_helper(9, size_sub, 9, 0);
+ check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
+ check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
+ check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
+ check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
+ check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
+ check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
+ check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
+ check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
+ check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
+ check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
var = 4;
- err |= check_one_size_helper(4 * sizeof(*obj->data),
- flex_array_size, obj, data, var++);
- err |= check_one_size_helper(5 * sizeof(*obj->data),
- flex_array_size, obj, data, var++);
- err |= check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
- err |= check_one_size_helper(sizeof(*obj->data),
- flex_array_size, obj, data, 1 + unconst);
- err |= check_one_size_helper(7 * sizeof(*obj->data),
- flex_array_size, obj, data, 7 + unconst);
- err |= check_one_size_helper(SIZE_MAX,
- flex_array_size, obj, data, -1 + unconst);
- err |= check_one_size_helper(SIZE_MAX,
- flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
+ check_one_size_helper(4 * sizeof(*obj->data),
+ flex_array_size, obj, data, var++);
+ check_one_size_helper(5 * sizeof(*obj->data),
+ flex_array_size, obj, data, var++);
+ check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
+ check_one_size_helper(sizeof(*obj->data),
+ flex_array_size, obj, data, 1 + unconst);
+ check_one_size_helper(7 * sizeof(*obj->data),
+ flex_array_size, obj, data, 7 + unconst);
+ check_one_size_helper(SIZE_MAX,
+ flex_array_size, obj, data, -1 + unconst);
+ check_one_size_helper(SIZE_MAX,
+ flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
var = 4;
- err |= check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
- struct_size, obj, data, var++);
- err |= check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
- struct_size, obj, data, var++);
- err |= check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
- err |= check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
- struct_size, obj, data, 1 + unconst);
- err |= check_one_size_helper(SIZE_MAX,
- struct_size, obj, data, -3 + unconst);
- err |= check_one_size_helper(SIZE_MAX,
- struct_size, obj, data, SIZE_MAX - 3 + unconst);
-
- pr_info("%d overflow size helper tests finished\n", count);
-
- return err;
+ check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
+ struct_size, obj, data, var++);
+ check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
+ struct_size, obj, data, var++);
+ check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
+ check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
+ struct_size, obj, data, 1 + unconst);
+ check_one_size_helper(SIZE_MAX,
+ struct_size, obj, data, -3 + unconst);
+ check_one_size_helper(SIZE_MAX,
+ struct_size, obj, data, SIZE_MAX - 3 + unconst);
+
+ kunit_info(test, "%d overflow size helper tests finished\n", count);
+#undef check_one_size_helper
}
-static int __init test_module_init(void)
-{
- int err = 0;
-
- err |= test_overflow_calculation();
- err |= test_overflow_shift();
- err |= test_overflow_size_helpers();
- err |= test_overflow_allocation();
-
- if (err) {
- pr_warn("FAIL!\n");
- err = -EINVAL;
- } else {
- pr_info("all tests passed\n");
- }
+static struct kunit_case overflow_test_cases[] = {
+ KUNIT_CASE(u8_overflow_test),
+ KUNIT_CASE(s8_overflow_test),
+ KUNIT_CASE(u16_overflow_test),
+ KUNIT_CASE(s16_overflow_test),
+ KUNIT_CASE(u32_overflow_test),
+ KUNIT_CASE(s32_overflow_test),
+#if BITS_PER_LONG == 64
+ KUNIT_CASE(u64_overflow_test),
+ KUNIT_CASE(s64_overflow_test),
+#endif
+ KUNIT_CASE(overflow_shift_test),
+ KUNIT_CASE(overflow_allocation_test),
+ KUNIT_CASE(overflow_size_helpers_test),
+ {}
+};
- return err;
-}
+static struct kunit_suite overflow_test_suite = {
+ .name = "overflow",
+ .test_cases = overflow_test_cases,
+};
-static void __exit test_module_exit(void)
-{ }
+kunit_test_suite(overflow_test_suite);
-module_init(test_module_init);
-module_exit(test_module_exit);
MODULE_LICENSE("Dual MIT/GPL");
--
2.30.2
On Wed, Feb 23, 2022 at 09:48:25PM -0800, Kees Cook wrote:
> Convert overflow unit tests to KUnit, for better integration into the
> kernel self test framework. Includes a rename of test_overflow.c to
> overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
>
> $ ./tools/testing/kunit/kunit.py config
> ...
> $ ./tools/testing/kunit/kunit.py run overflow
> ...
> [14:33:51] Starting KUnit Kernel (1/1)...
> [14:33:51] ============================================================
> [14:33:51] ================== overflow (11 subtests) ==================
> [14:33:51] [PASSED] u8_overflow_test
> [14:33:51] [PASSED] s8_overflow_test
> [14:33:51] [PASSED] u16_overflow_test
> [14:33:51] [PASSED] s16_overflow_test
> [14:33:51] [PASSED] u32_overflow_test
> [14:33:51] [PASSED] s32_overflow_test
> [14:33:51] [PASSED] u64_overflow_test
> [14:33:51] [PASSED] s64_overflow_test
> [14:33:51] [PASSED] overflow_shift_test
> [14:33:51] [PASSED] overflow_allocation_test
> [14:33:51] [PASSED] overflow_size_helpers_test
> [14:33:51] ==================== [PASSED] overflow =====================
> [14:33:51] ============================================================
> [14:33:51] Testing complete. Passed: 11, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0
> [14:33:51] Elapsed time: 12.525s total, 0.001s configuring, 12.402s building, 0.101s running
>
> Cc: David Gow <[email protected]>
> Cc: Rasmus Villemoes <[email protected]>
> Cc: Nick Desaulniers <[email protected]>
> Co-developed-by: Vitor Massaru Iha <[email protected]>
> Signed-off-by: Vitor Massaru Iha <[email protected]>
> Link: https://lore.kernel.org/lkml/[email protected]/
> Co-developed-by: Daniel Latypov <[email protected]>
> Signed-off-by: Daniel Latypov <[email protected]>
> Link: https://lore.kernel.org/linux-kselftest/[email protected]/
> Acked-by: Nick Desaulniers <[email protected]>
> Link: https://lore.kernel.org/lkml/CAKwvOdm62iA1dNiC6Q11UJ-MnTqtc4kXkm-ubPaFMK824_k0nw@mail.gmail.com
> Signed-off-by: Kees Cook <[email protected]>
Acked-by: Gustavo A. R. Silva <[email protected]>
Thanks
--
Gustavo
> ---
> v1: https://lore.kernel.org/lkml/[email protected]/
> v2: Fixed up the authorship more, pulled in other prior changes (Daniel)
> ---
> lib/Kconfig.debug | 16 +-
> lib/Makefile | 2 +-
> lib/{test_overflow.c => overflow_kunit.c} | 555 ++++++++++------------
> 3 files changed, 264 insertions(+), 309 deletions(-)
> rename lib/{test_overflow.c => overflow_kunit.c} (54%)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 14b89aa37c5c..14d90d03bc8d 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2214,9 +2214,6 @@ config TEST_UUID
> config TEST_XARRAY
> tristate "Test the XArray code at runtime"
>
> -config TEST_OVERFLOW
> - tristate "Test check_*_overflow() functions at runtime"
> -
> config TEST_RHASHTABLE
> tristate "Perform selftest on resizable hash table"
> help
> @@ -2501,6 +2498,19 @@ config MEMCPY_KUNIT_TEST
>
> If unsure, say N.
>
> +config OVERFLOW_KUNIT_TEST
> + tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
> + depends on KUNIT
> + default KUNIT_ALL_TESTS
> + help
> + Builds unit tests for the check_*_overflow(), size_*(), allocation, and
> + related functions.
> +
> + For more information on KUnit and unit tests in general please refer
> + to the KUnit documentation in Documentation/dev-tools/kunit/.
> +
> + If unsure, say N.
> +
> config TEST_UDELAY
> tristate "udelay test driver"
> help
> diff --git a/lib/Makefile b/lib/Makefile
> index 300f569c626b..fdfcbfaff32f 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -77,7 +77,6 @@ obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
> obj-$(CONFIG_TEST_MIN_HEAP) += test_min_heap.o
> obj-$(CONFIG_TEST_LKM) += test_module.o
> obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
> -obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o
> obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
> obj-$(CONFIG_TEST_SORT) += test_sort.o
> obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
> @@ -363,6 +362,7 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o
> obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
> obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
> obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
> +obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
>
> obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
>
> diff --git a/lib/test_overflow.c b/lib/overflow_kunit.c
> similarity index 54%
> rename from lib/test_overflow.c
> rename to lib/overflow_kunit.c
> index f6530fce799d..835b1a312c76 100644
> --- a/lib/test_overflow.c
> +++ b/lib/overflow_kunit.c
> @@ -1,11 +1,14 @@
> // SPDX-License-Identifier: GPL-2.0 OR MIT
> /*
> - * Test cases for arithmetic overflow checks.
> + * Test cases for arithmetic overflow checks. See:
> + * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
> + * ./tools/testing/kunit/kunit.py config
> + * ./tools/testing/kunit/kunit.py run overflow [--raw_output]
> */
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <kunit/test.h>
> #include <linux/device.h>
> -#include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/module.h>
> @@ -19,7 +22,7 @@
> t a, b; \
> t sum, diff, prod; \
> bool s_of, d_of, p_of; \
> - } t ## _tests[] __initconst
> + } t ## _tests[]
>
> DEFINE_TEST_ARRAY(u8) = {
> {0, 0, 0, 0, 0, false, false, false},
> @@ -220,43 +223,31 @@ DEFINE_TEST_ARRAY(s64) = {
> bool _of; \
> \
> _of = check_ ## op ## _overflow(a, b, &_r); \
> - if (_of != of) { \
> - pr_warn("expected "fmt" "sym" "fmt \
> - " to%s overflow (type %s)\n", \
> - a, b, of ? "" : " not", #t); \
> - err = 1; \
> - } \
> - if (_r != r) { \
> - pr_warn("expected "fmt" "sym" "fmt" == " \
> - fmt", got "fmt" (type %s)\n", \
> - a, b, r, _r, #t); \
> - err = 1; \
> - } \
> + KUNIT_EXPECT_EQ_MSG(test, _of, of, \
> + "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \
> + a, b, of ? "" : " not", #t); \
> + KUNIT_EXPECT_EQ_MSG(test, _r, r, \
> + "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \
> + a, b, r, _r, #t); \
> } while (0)
>
> #define DEFINE_TEST_FUNC(t, fmt) \
> -static int __init do_test_ ## t(const struct test_ ## t *p) \
> +static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \
> { \
> - int err = 0; \
> - \
> check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
> check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
> check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
> check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
> check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
> - \
> - return err; \
> } \
> \
> -static int __init test_ ## t ## _overflow(void) { \
> - int err = 0; \
> +static void t ## _overflow_test(struct kunit *test) { \
> unsigned i; \
> \
> for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
> - err |= do_test_ ## t(&t ## _tests[i]); \
> - pr_info("%zu %s arithmetic tests finished\n", \
> + do_test_ ## t(test, &t ## _tests[i]); \
> + kunit_info(test, "%zu %s arithmetic tests finished\n", \
> ARRAY_SIZE(t ## _tests), #t); \
> - return err; \
> }
>
> DEFINE_TEST_FUNC(u8, "%d");
> @@ -270,198 +261,176 @@ DEFINE_TEST_FUNC(u64, "%llu");
> DEFINE_TEST_FUNC(s64, "%lld");
> #endif
>
> -static int __init test_overflow_calculation(void)
> +static void overflow_shift_test(struct kunit *test)
> {
> - int err = 0;
> -
> - err |= test_u8_overflow();
> - err |= test_s8_overflow();
> - err |= test_u16_overflow();
> - err |= test_s16_overflow();
> - err |= test_u32_overflow();
> - err |= test_s32_overflow();
> -#if BITS_PER_LONG == 64
> - err |= test_u64_overflow();
> - err |= test_s64_overflow();
> -#endif
> -
> - return err;
> -}
> -
> -static int __init test_overflow_shift(void)
> -{
> - int err = 0;
> int count = 0;
>
> /* Args are: value, shift, type, expected result, overflow expected */
> -#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \
> - int __failed = 0; \
> +#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
> typeof(a) __a = (a); \
> typeof(s) __s = (s); \
> t __e = (expect); \
> t __d; \
> bool __of = check_shl_overflow(__a, __s, &__d); \
> if (__of != of) { \
> - pr_warn("expected (%s)(%s << %s) to%s overflow\n", \
> + KUNIT_EXPECT_EQ_MSG(test, __of, of, \
> + "expected (%s)(%s << %s) to%s overflow\n", \
> #t, #a, #s, of ? "" : " not"); \
> - __failed = 1; \
> } else if (!__of && __d != __e) { \
> - pr_warn("expected (%s)(%s << %s) == %s\n", \
> + KUNIT_EXPECT_EQ_MSG(test, __d, __e, \
> + "expected (%s)(%s << %s) == %s\n", \
> #t, #a, #s, #expect); \
> if ((t)-1 < 0) \
> - pr_warn("got %lld\n", (s64)__d); \
> + kunit_info(test, "got %lld\n", (s64)__d); \
> else \
> - pr_warn("got %llu\n", (u64)__d); \
> - __failed = 1; \
> + kunit_info(test, "got %llu\n", (u64)__d); \
> } \
> count++; \
> - __failed; \
> -})
> +} while (0)
>
> /* Sane shifts. */
> - err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
> - err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
> - err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
> - err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
> - err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
> - err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
> - err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
> - err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
> - err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
> - err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
> - err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
> - err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
> - err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
> - err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
> - err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
> - err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
> - err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
> - err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
> - err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64,
> - 0xFFFFFFFFULL << 32, false);
> + TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
> + TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
> + TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
> + TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
> + TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
> + TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
> + TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
> + TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
> + TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
> + TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
> + TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
> + TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
> + TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
> + TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
> + TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
> + TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
> + TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
> + TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
> + TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
> + TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
> + TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
> + TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false);
>
> /* Sane shift: start and end with 0, without a too-wide shift. */
> - err |= TEST_ONE_SHIFT(0, 7, u8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 15, u16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, u32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 63, u64, 0, false);
> + TEST_ONE_SHIFT(0, 7, u8, 0, false);
> + TEST_ONE_SHIFT(0, 15, u16, 0, false);
> + TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
> + TEST_ONE_SHIFT(0, 31, u32, 0, false);
> + TEST_ONE_SHIFT(0, 63, u64, 0, false);
>
> /* Sane shift: start and end with 0, without reaching signed bit. */
> - err |= TEST_ONE_SHIFT(0, 6, s8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 14, s16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 30, int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 30, s32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 62, s64, 0, false);
> + TEST_ONE_SHIFT(0, 6, s8, 0, false);
> + TEST_ONE_SHIFT(0, 14, s16, 0, false);
> + TEST_ONE_SHIFT(0, 30, int, 0, false);
> + TEST_ONE_SHIFT(0, 30, s32, 0, false);
> + TEST_ONE_SHIFT(0, 62, s64, 0, false);
>
> /* Overflow: shifted the bit off the end. */
> - err |= TEST_ONE_SHIFT(1, 8, u8, 0, true);
> - err |= TEST_ONE_SHIFT(1, 16, u16, 0, true);
> - err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(1, 32, u32, 0, true);
> - err |= TEST_ONE_SHIFT(1, 64, u64, 0, true);
> + TEST_ONE_SHIFT(1, 8, u8, 0, true);
> + TEST_ONE_SHIFT(1, 16, u16, 0, true);
> + TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
> + TEST_ONE_SHIFT(1, 32, u32, 0, true);
> + TEST_ONE_SHIFT(1, 64, u64, 0, true);
>
> /* Overflow: shifted into the signed bit. */
> - err |= TEST_ONE_SHIFT(1, 7, s8, 0, true);
> - err |= TEST_ONE_SHIFT(1, 15, s16, 0, true);
> - err |= TEST_ONE_SHIFT(1, 31, int, 0, true);
> - err |= TEST_ONE_SHIFT(1, 31, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1, 63, s64, 0, true);
> + TEST_ONE_SHIFT(1, 7, s8, 0, true);
> + TEST_ONE_SHIFT(1, 15, s16, 0, true);
> + TEST_ONE_SHIFT(1, 31, int, 0, true);
> + TEST_ONE_SHIFT(1, 31, s32, 0, true);
> + TEST_ONE_SHIFT(1, 63, s64, 0, true);
>
> /* Overflow: high bit falls off unsigned types. */
> /* 10010110 */
> - err |= TEST_ONE_SHIFT(150, 1, u8, 0, true);
> + TEST_ONE_SHIFT(150, 1, u8, 0, true);
> /* 1000100010010110 */
> - err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true);
> + TEST_ONE_SHIFT(34966, 1, u16, 0, true);
> /* 10000100000010001000100010010110 */
> - err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
> - err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
> + TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
> + TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
> /* 1000001000010000010000000100000010000100000010001000100010010110 */
> - err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
> + TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
>
> /* Overflow: bit shifted into signed bit on signed types. */
> /* 01001011 */
> - err |= TEST_ONE_SHIFT(75, 1, s8, 0, true);
> + TEST_ONE_SHIFT(75, 1, s8, 0, true);
> /* 0100010001001011 */
> - err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true);
> + TEST_ONE_SHIFT(17483, 1, s16, 0, true);
> /* 01000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
> + TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
> + TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
> /* 0100000100001000001000000010000001000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
> + TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
>
> /* Overflow: bit shifted past signed bit on signed types. */
> /* 01001011 */
> - err |= TEST_ONE_SHIFT(75, 2, s8, 0, true);
> + TEST_ONE_SHIFT(75, 2, s8, 0, true);
> /* 0100010001001011 */
> - err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true);
> + TEST_ONE_SHIFT(17483, 2, s16, 0, true);
> /* 01000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
> + TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
> + TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
> /* 0100000100001000001000000010000001000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
> + TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
>
> /* Overflow: values larger than destination type. */
> - err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
> + TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
> + TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
> + TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
> + TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
> + TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
> + TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
>
> /* Nonsense: negative initial value. */
> - err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true);
> - err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true);
> - err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true);
> - err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true);
> - err |= TEST_ONE_SHIFT(-10, 0, int, 0, true);
> - err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true);
> - err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true);
> - err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
> - err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
> + TEST_ONE_SHIFT(-1, 0, s8, 0, true);
> + TEST_ONE_SHIFT(-1, 0, u8, 0, true);
> + TEST_ONE_SHIFT(-5, 0, s16, 0, true);
> + TEST_ONE_SHIFT(-5, 0, u16, 0, true);
> + TEST_ONE_SHIFT(-10, 0, int, 0, true);
> + TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
> + TEST_ONE_SHIFT(-100, 0, s32, 0, true);
> + TEST_ONE_SHIFT(-100, 0, u32, 0, true);
> + TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
> + TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
>
> /* Nonsense: negative shift values. */
> - err |= TEST_ONE_SHIFT(0, -5, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, -5, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, -10, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, -10, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, -15, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(0, -20, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, -20, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, -30, s64, 0, true);
> - err |= TEST_ONE_SHIFT(0, -30, u64, 0, true);
> + TEST_ONE_SHIFT(0, -5, s8, 0, true);
> + TEST_ONE_SHIFT(0, -5, u8, 0, true);
> + TEST_ONE_SHIFT(0, -10, s16, 0, true);
> + TEST_ONE_SHIFT(0, -10, u16, 0, true);
> + TEST_ONE_SHIFT(0, -15, int, 0, true);
> + TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
> + TEST_ONE_SHIFT(0, -20, s32, 0, true);
> + TEST_ONE_SHIFT(0, -20, u32, 0, true);
> + TEST_ONE_SHIFT(0, -30, s64, 0, true);
> + TEST_ONE_SHIFT(0, -30, u64, 0, true);
>
> /* Overflow: shifted at or beyond entire type's bit width. */
> - err |= TEST_ONE_SHIFT(0, 8, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 9, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 8, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 9, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 16, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 17, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 16, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 17, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 64, u64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 65, u64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 64, s64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 65, s64, 0, true);
> + TEST_ONE_SHIFT(0, 8, u8, 0, true);
> + TEST_ONE_SHIFT(0, 9, u8, 0, true);
> + TEST_ONE_SHIFT(0, 8, s8, 0, true);
> + TEST_ONE_SHIFT(0, 9, s8, 0, true);
> + TEST_ONE_SHIFT(0, 16, u16, 0, true);
> + TEST_ONE_SHIFT(0, 17, u16, 0, true);
> + TEST_ONE_SHIFT(0, 16, s16, 0, true);
> + TEST_ONE_SHIFT(0, 17, s16, 0, true);
> + TEST_ONE_SHIFT(0, 32, u32, 0, true);
> + TEST_ONE_SHIFT(0, 33, u32, 0, true);
> + TEST_ONE_SHIFT(0, 32, int, 0, true);
> + TEST_ONE_SHIFT(0, 33, int, 0, true);
> + TEST_ONE_SHIFT(0, 32, s32, 0, true);
> + TEST_ONE_SHIFT(0, 33, s32, 0, true);
> + TEST_ONE_SHIFT(0, 64, u64, 0, true);
> + TEST_ONE_SHIFT(0, 65, u64, 0, true);
> + TEST_ONE_SHIFT(0, 64, s64, 0, true);
> + TEST_ONE_SHIFT(0, 65, s64, 0, true);
>
> /*
> * Corner case: for unsigned types, we fail when we've shifted
> @@ -472,17 +441,14 @@ static int __init test_overflow_shift(void)
> * signed bit). So, for now, we will test this condition but
> * mark it as not expected to overflow.
> */
> - err |= TEST_ONE_SHIFT(0, 7, s8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 15, s16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, s32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 63, s64, 0, false);
> -
> - pr_info("%d shift tests finished\n", count);
> + TEST_ONE_SHIFT(0, 7, s8, 0, false);
> + TEST_ONE_SHIFT(0, 15, s16, 0, false);
> + TEST_ONE_SHIFT(0, 31, int, 0, false);
> + TEST_ONE_SHIFT(0, 31, s32, 0, false);
> + TEST_ONE_SHIFT(0, 63, s64, 0, false);
>
> + kunit_info(test, "%d shift tests finished\n", count);
> #undef TEST_ONE_SHIFT
> -
> - return err;
> }
>
> /*
> @@ -502,7 +468,7 @@ static int __init test_overflow_shift(void)
> #define TEST_SIZE (5 * 4096)
>
> #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
> -static int __init test_ ## func (void *arg) \
> +static void test_ ## func (struct kunit *test, void *arg) \
> { \
> volatile size_t a = TEST_SIZE; \
> volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \
> @@ -510,30 +476,24 @@ static int __init test_ ## func (void *arg) \
> \
> /* Tiny allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
> - if (!ptr) { \
> - pr_warn(#func " failed regular allocation?!\n"); \
> - return 1; \
> - } \
> + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
> + #func " failed regular allocation?!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> \
> /* Wrapped allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
> a * b); \
> - if (!ptr) { \
> - pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \
> - return 1; \
> - } \
> + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
> + #func " unexpectedly failed bad wrapping?!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> \
> /* Saturated allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
> array_size(a, b)); \
> if (ptr) { \
> - pr_warn(#func " missed saturation!\n"); \
> + KUNIT_FAIL(test, #func " missed saturation!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> - return 1; \
> } \
> - return 0; \
> }
>
> /*
> @@ -554,44 +514,38 @@ DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1);
> DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0);
> DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0);
>
> -static int __init test_overflow_allocation(void)
> +static void overflow_allocation_test(struct kunit *test)
> {
> const char device_name[] = "overflow-test";
> struct device *dev;
> int count = 0;
> - int err = 0;
>
> -#define check_allocation_overflow(alloc) ({ \
> +#define check_allocation_overflow(alloc) do { \
> count++; \
> - test_ ## alloc(dev); \
> -})
> + test_ ## alloc(test, dev); \
> +} while (0)
>
> /* Create dummy device for devm_kmalloc()-family tests. */
> dev = root_device_register(device_name);
> - if (IS_ERR(dev)) {
> - pr_warn("Cannot register test device\n");
> - return 1;
> - }
> -
> - err |= check_allocation_overflow(kmalloc);
> - err |= check_allocation_overflow(kmalloc_node);
> - err |= check_allocation_overflow(kzalloc);
> - err |= check_allocation_overflow(kzalloc_node);
> - err |= check_allocation_overflow(__vmalloc);
> - err |= check_allocation_overflow(kvmalloc);
> - err |= check_allocation_overflow(kvmalloc_node);
> - err |= check_allocation_overflow(kvzalloc);
> - err |= check_allocation_overflow(kvzalloc_node);
> - err |= check_allocation_overflow(devm_kmalloc);
> - err |= check_allocation_overflow(devm_kzalloc);
> + KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
> + "Cannot register test device\n");
> +
> + check_allocation_overflow(kmalloc);
> + check_allocation_overflow(kmalloc_node);
> + check_allocation_overflow(kzalloc);
> + check_allocation_overflow(kzalloc_node);
> + check_allocation_overflow(__vmalloc);
> + check_allocation_overflow(kvmalloc);
> + check_allocation_overflow(kvmalloc_node);
> + check_allocation_overflow(kvzalloc);
> + check_allocation_overflow(kvzalloc_node);
> + check_allocation_overflow(devm_kmalloc);
> + check_allocation_overflow(devm_kzalloc);
>
> device_unregister(dev);
>
> - pr_info("%d allocation overflow tests finished\n", count);
> -
> + kunit_info(test, "%d allocation overflow tests finished\n", count);
> #undef check_allocation_overflow
> -
> - return err;
> }
>
> struct __test_flex_array {
> @@ -600,127 +554,118 @@ struct __test_flex_array {
> unsigned long data[];
> };
>
> -static int __init test_overflow_size_helpers(void)
> +static void overflow_size_helpers_test(struct kunit *test)
> {
> /* Make sure struct_size() can be used in a constant expression. */
> u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
> struct __test_flex_array *obj;
> int count = 0;
> - int err = 0;
> int var;
> volatile int unconst = 0;
>
> /* Verify constant expression against runtime version. */
> var = 55;
> OPTIMIZER_HIDE_VAR(var);
> - err |= sizeof(ce_array) != struct_size(obj, data, var);
> + KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var));
>
> -#define check_one_size_helper(expected, func, args...) ({ \
> - bool __failure = false; \
> - size_t _r; \
> - \
> - _r = func(args); \
> - if (_r != (expected)) { \
> - pr_warn("expected " #func "(" #args ") " \
> - "to return %zu but got %zu instead\n", \
> - (size_t)(expected), _r); \
> - __failure = true; \
> - } \
> +#define check_one_size_helper(expected, func, args...) do { \
> + size_t _r = func(args); \
> + KUNIT_EXPECT_EQ_MSG(test, _r, expected, \
> + "expected " #func "(" #args ") to return %zu but got %zu instead\n", \
> + (size_t)(expected), _r); \
> count++; \
> - __failure; \
> -})
> +} while (0)
>
> var = 4;
> - err |= check_one_size_helper(20, size_mul, var++, 5);
> - err |= check_one_size_helper(20, size_mul, 4, var++);
> - err |= check_one_size_helper(0, size_mul, 0, 3);
> - err |= check_one_size_helper(0, size_mul, 3, 0);
> - err |= check_one_size_helper(6, size_mul, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
> + check_one_size_helper(20, size_mul, var++, 5);
> + check_one_size_helper(20, size_mul, 4, var++);
> + check_one_size_helper(0, size_mul, 0, 3);
> + check_one_size_helper(0, size_mul, 3, 0);
> + check_one_size_helper(6, size_mul, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
>
> var = 4;
> - err |= check_one_size_helper(9, size_add, var++, 5);
> - err |= check_one_size_helper(9, size_add, 4, var++);
> - err |= check_one_size_helper(9, size_add, 9, 0);
> - err |= check_one_size_helper(9, size_add, 0, 9);
> - err |= check_one_size_helper(5, size_add, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
> + check_one_size_helper(9, size_add, var++, 5);
> + check_one_size_helper(9, size_add, 4, var++);
> + check_one_size_helper(9, size_add, 9, 0);
> + check_one_size_helper(9, size_add, 0, 9);
> + check_one_size_helper(5, size_add, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
>
> var = 4;
> - err |= check_one_size_helper(1, size_sub, var--, 3);
> - err |= check_one_size_helper(1, size_sub, 4, var--);
> - err |= check_one_size_helper(1, size_sub, 3, 2);
> - err |= check_one_size_helper(9, size_sub, 9, 0);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
> - err |= check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
> - err |= check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
> - err |= check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
> + check_one_size_helper(1, size_sub, var--, 3);
> + check_one_size_helper(1, size_sub, 4, var--);
> + check_one_size_helper(1, size_sub, 3, 2);
> + check_one_size_helper(9, size_sub, 9, 0);
> + check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
> + check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
> + check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
> + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
> + check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
> + check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
> + check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
> + check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
> + check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
>
> var = 4;
> - err |= check_one_size_helper(4 * sizeof(*obj->data),
> - flex_array_size, obj, data, var++);
> - err |= check_one_size_helper(5 * sizeof(*obj->data),
> - flex_array_size, obj, data, var++);
> - err |= check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
> - err |= check_one_size_helper(sizeof(*obj->data),
> - flex_array_size, obj, data, 1 + unconst);
> - err |= check_one_size_helper(7 * sizeof(*obj->data),
> - flex_array_size, obj, data, 7 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - flex_array_size, obj, data, -1 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
> + check_one_size_helper(4 * sizeof(*obj->data),
> + flex_array_size, obj, data, var++);
> + check_one_size_helper(5 * sizeof(*obj->data),
> + flex_array_size, obj, data, var++);
> + check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
> + check_one_size_helper(sizeof(*obj->data),
> + flex_array_size, obj, data, 1 + unconst);
> + check_one_size_helper(7 * sizeof(*obj->data),
> + flex_array_size, obj, data, 7 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + flex_array_size, obj, data, -1 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
>
> var = 4;
> - err |= check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
> - struct_size, obj, data, var++);
> - err |= check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
> - struct_size, obj, data, var++);
> - err |= check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
> - err |= check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
> - struct_size, obj, data, 1 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - struct_size, obj, data, -3 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - struct_size, obj, data, SIZE_MAX - 3 + unconst);
> -
> - pr_info("%d overflow size helper tests finished\n", count);
> -
> - return err;
> + check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
> + struct_size, obj, data, var++);
> + check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
> + struct_size, obj, data, var++);
> + check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
> + check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
> + struct_size, obj, data, 1 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + struct_size, obj, data, -3 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + struct_size, obj, data, SIZE_MAX - 3 + unconst);
> +
> + kunit_info(test, "%d overflow size helper tests finished\n", count);
> +#undef check_one_size_helper
> }
>
> -static int __init test_module_init(void)
> -{
> - int err = 0;
> -
> - err |= test_overflow_calculation();
> - err |= test_overflow_shift();
> - err |= test_overflow_size_helpers();
> - err |= test_overflow_allocation();
> -
> - if (err) {
> - pr_warn("FAIL!\n");
> - err = -EINVAL;
> - } else {
> - pr_info("all tests passed\n");
> - }
> +static struct kunit_case overflow_test_cases[] = {
> + KUNIT_CASE(u8_overflow_test),
> + KUNIT_CASE(s8_overflow_test),
> + KUNIT_CASE(u16_overflow_test),
> + KUNIT_CASE(s16_overflow_test),
> + KUNIT_CASE(u32_overflow_test),
> + KUNIT_CASE(s32_overflow_test),
> +#if BITS_PER_LONG == 64
> + KUNIT_CASE(u64_overflow_test),
> + KUNIT_CASE(s64_overflow_test),
> +#endif
> + KUNIT_CASE(overflow_shift_test),
> + KUNIT_CASE(overflow_allocation_test),
> + KUNIT_CASE(overflow_size_helpers_test),
> + {}
> +};
>
> - return err;
> -}
> +static struct kunit_suite overflow_test_suite = {
> + .name = "overflow",
> + .test_cases = overflow_test_cases,
> +};
>
> -static void __exit test_module_exit(void)
> -{ }
> +kunit_test_suite(overflow_test_suite);
>
> -module_init(test_module_init);
> -module_exit(test_module_exit);
> MODULE_LICENSE("Dual MIT/GPL");
> --
> 2.30.2
>
On Thu, Feb 24, 2022 at 1:48 PM Kees Cook <[email protected]> wrote:
>
> Convert overflow unit tests to KUnit, for better integration into the
> kernel self test framework. Includes a rename of test_overflow.c to
> overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
>
> $ ./tools/testing/kunit/kunit.py config
> ...
(This 'config' step should be unnecessary... See below)
> $ ./tools/testing/kunit/kunit.py run overflow
> ...
> [14:33:51] Starting KUnit Kernel (1/1)...
> [14:33:51] ============================================================
> [14:33:51] ================== overflow (11 subtests) ==================
> [14:33:51] [PASSED] u8_overflow_test
> [14:33:51] [PASSED] s8_overflow_test
> [14:33:51] [PASSED] u16_overflow_test
> [14:33:51] [PASSED] s16_overflow_test
> [14:33:51] [PASSED] u32_overflow_test
> [14:33:51] [PASSED] s32_overflow_test
> [14:33:51] [PASSED] u64_overflow_test
> [14:33:51] [PASSED] s64_overflow_test
> [14:33:51] [PASSED] overflow_shift_test
> [14:33:51] [PASSED] overflow_allocation_test
> [14:33:51] [PASSED] overflow_size_helpers_test
> [14:33:51] ==================== [PASSED] overflow =====================
> [14:33:51] ============================================================
> [14:33:51] Testing complete. Passed: 11, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0
> [14:33:51] Elapsed time: 12.525s total, 0.001s configuring, 12.402s building, 0.101s running
>
> Cc: David Gow <[email protected]>
> Cc: Rasmus Villemoes <[email protected]>
> Cc: Nick Desaulniers <[email protected]>
> Co-developed-by: Vitor Massaru Iha <[email protected]>
> Signed-off-by: Vitor Massaru Iha <[email protected]>
> Link: https://lore.kernel.org/lkml/[email protected]/
> Co-developed-by: Daniel Latypov <[email protected]>
> Signed-off-by: Daniel Latypov <[email protected]>
> Link: https://lore.kernel.org/linux-kselftest/[email protected]/
> Acked-by: Nick Desaulniers <[email protected]>
> Link: https://lore.kernel.org/lkml/CAKwvOdm62iA1dNiC6Q11UJ-MnTqtc4kXkm-ubPaFMK824_k0nw@mail.gmail.com
> Signed-off-by: Kees Cook <[email protected]>
> ---
> v1: https://lore.kernel.org/lkml/[email protected]/
> v2: Fixed up the authorship more, pulled in other prior changes (Daniel)
This looks good to me. Some of the test cases _could_ probably be done
as parameterised tests (given they're already basically table-driven),
but I admit that could end up being excessively verbose.
Apart from my not being able to find a tree this applies cleanly on,
the tests work well here.
Reviewed-by: David Gow <[email protected]>
Cheers,
-- David
> ---
> lib/Kconfig.debug | 16 +-
> lib/Makefile | 2 +-
> lib/{test_overflow.c => overflow_kunit.c} | 555 ++++++++++------------
> 3 files changed, 264 insertions(+), 309 deletions(-)
> rename lib/{test_overflow.c => overflow_kunit.c} (54%)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 14b89aa37c5c..14d90d03bc8d 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2214,9 +2214,6 @@ config TEST_UUID
> config TEST_XARRAY
> tristate "Test the XArray code at runtime"
>
> -config TEST_OVERFLOW
> - tristate "Test check_*_overflow() functions at runtime"
> -
> config TEST_RHASHTABLE
> tristate "Perform selftest on resizable hash table"
> help
> @@ -2501,6 +2498,19 @@ config MEMCPY_KUNIT_TEST
>
> If unsure, say N.
>
> +config OVERFLOW_KUNIT_TEST
> + tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
> + depends on KUNIT
> + default KUNIT_ALL_TESTS
> + help
> + Builds unit tests for the check_*_overflow(), size_*(), allocation, and
> + related functions.
> +
> + For more information on KUnit and unit tests in general please refer
> + to the KUnit documentation in Documentation/dev-tools/kunit/.
> +
> + If unsure, say N.
> +
> config TEST_UDELAY
> tristate "udelay test driver"
> help
> diff --git a/lib/Makefile b/lib/Makefile
> index 300f569c626b..fdfcbfaff32f 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -77,7 +77,6 @@ obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
> obj-$(CONFIG_TEST_MIN_HEAP) += test_min_heap.o
> obj-$(CONFIG_TEST_LKM) += test_module.o
> obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
> -obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o
> obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
> obj-$(CONFIG_TEST_SORT) += test_sort.o
> obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
> @@ -363,6 +362,7 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o
> obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
> obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
> obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
> +obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
>
> obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
>
> diff --git a/lib/test_overflow.c b/lib/overflow_kunit.c
> similarity index 54%
> rename from lib/test_overflow.c
> rename to lib/overflow_kunit.c
> index f6530fce799d..835b1a312c76 100644
> --- a/lib/test_overflow.c
> +++ b/lib/overflow_kunit.c
> @@ -1,11 +1,14 @@
> // SPDX-License-Identifier: GPL-2.0 OR MIT
> /*
> - * Test cases for arithmetic overflow checks.
> + * Test cases for arithmetic overflow checks. See:
> + * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests
> + * ./tools/testing/kunit/kunit.py config
The kunit.py run command should automatically run kunit.py config
(while it can be useful to split them up to inspect the generated
config, and/or build manually, it's not required).
You can run the various stages of kunit.py run independently with
kunit.py {config, build, exec} in order.
> + * ./tools/testing/kunit/kunit.py run overflow [--raw_output]
> */
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <kunit/test.h>
> #include <linux/device.h>
> -#include <linux/init.h>
> #include <linux/kernel.h>
> #include <linux/mm.h>
> #include <linux/module.h>
> @@ -19,7 +22,7 @@
> t a, b; \
> t sum, diff, prod; \
> bool s_of, d_of, p_of; \
> - } t ## _tests[] __initconst
> + } t ## _tests[]
>
> DEFINE_TEST_ARRAY(u8) = {
> {0, 0, 0, 0, 0, false, false, false},
> @@ -220,43 +223,31 @@ DEFINE_TEST_ARRAY(s64) = {
> bool _of; \
> \
> _of = check_ ## op ## _overflow(a, b, &_r); \
> - if (_of != of) { \
> - pr_warn("expected "fmt" "sym" "fmt \
> - " to%s overflow (type %s)\n", \
> - a, b, of ? "" : " not", #t); \
> - err = 1; \
> - } \
> - if (_r != r) { \
> - pr_warn("expected "fmt" "sym" "fmt" == " \
> - fmt", got "fmt" (type %s)\n", \
> - a, b, r, _r, #t); \
> - err = 1; \
> - } \
> + KUNIT_EXPECT_EQ_MSG(test, _of, of, \
> + "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \
> + a, b, of ? "" : " not", #t); \
> + KUNIT_EXPECT_EQ_MSG(test, _r, r, \
> + "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \
> + a, b, r, _r, #t); \
> } while (0)
>
> #define DEFINE_TEST_FUNC(t, fmt) \
> -static int __init do_test_ ## t(const struct test_ ## t *p) \
> +static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \
> { \
> - int err = 0; \
> - \
> check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
> check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
> check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
> check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
> check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
> - \
> - return err; \
> } \
> \
> -static int __init test_ ## t ## _overflow(void) { \
> - int err = 0; \
> +static void t ## _overflow_test(struct kunit *test) { \
> unsigned i; \
> \
> for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
> - err |= do_test_ ## t(&t ## _tests[i]); \
> - pr_info("%zu %s arithmetic tests finished\n", \
> + do_test_ ## t(test, &t ## _tests[i]); \
> + kunit_info(test, "%zu %s arithmetic tests finished\n", \
> ARRAY_SIZE(t ## _tests), #t); \
> - return err; \
> }
>
> DEFINE_TEST_FUNC(u8, "%d");
> @@ -270,198 +261,176 @@ DEFINE_TEST_FUNC(u64, "%llu");
> DEFINE_TEST_FUNC(s64, "%lld");
> #endif
>
> -static int __init test_overflow_calculation(void)
> +static void overflow_shift_test(struct kunit *test)
> {
> - int err = 0;
> -
> - err |= test_u8_overflow();
> - err |= test_s8_overflow();
> - err |= test_u16_overflow();
> - err |= test_s16_overflow();
> - err |= test_u32_overflow();
> - err |= test_s32_overflow();
> -#if BITS_PER_LONG == 64
> - err |= test_u64_overflow();
> - err |= test_s64_overflow();
> -#endif
> -
> - return err;
> -}
> -
> -static int __init test_overflow_shift(void)
> -{
> - int err = 0;
> int count = 0;
>
> /* Args are: value, shift, type, expected result, overflow expected */
> -#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \
> - int __failed = 0; \
> +#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
> typeof(a) __a = (a); \
> typeof(s) __s = (s); \
> t __e = (expect); \
> t __d; \
> bool __of = check_shl_overflow(__a, __s, &__d); \
> if (__of != of) { \
> - pr_warn("expected (%s)(%s << %s) to%s overflow\n", \
> + KUNIT_EXPECT_EQ_MSG(test, __of, of, \
> + "expected (%s)(%s << %s) to%s overflow\n", \
> #t, #a, #s, of ? "" : " not"); \
> - __failed = 1; \
> } else if (!__of && __d != __e) { \
> - pr_warn("expected (%s)(%s << %s) == %s\n", \
> + KUNIT_EXPECT_EQ_MSG(test, __d, __e, \
> + "expected (%s)(%s << %s) == %s\n", \
> #t, #a, #s, #expect); \
> if ((t)-1 < 0) \
> - pr_warn("got %lld\n", (s64)__d); \
> + kunit_info(test, "got %lld\n", (s64)__d); \
> else \
> - pr_warn("got %llu\n", (u64)__d); \
> - __failed = 1; \
> + kunit_info(test, "got %llu\n", (u64)__d); \
> } \
> count++; \
> - __failed; \
> -})
> +} while (0)
>
> /* Sane shifts. */
> - err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
> - err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
> - err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
> - err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
> - err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
> - err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
> - err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
> - err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
> - err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
> - err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
> - err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
> - err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
> - err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
> - err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
> - err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
> - err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
> - err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
> - err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
> - err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
> - err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64,
> - 0xFFFFFFFFULL << 32, false);
> + TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
> + TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
> + TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
> + TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
> + TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
> + TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
> + TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
> + TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
> + TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
> + TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
> + TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
> + TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
> + TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
> + TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
> + TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
> + TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
> + TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
> + TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
> + TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
> + TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
> + TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
> + TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
> + TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false);
>
> /* Sane shift: start and end with 0, without a too-wide shift. */
> - err |= TEST_ONE_SHIFT(0, 7, u8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 15, u16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, u32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 63, u64, 0, false);
> + TEST_ONE_SHIFT(0, 7, u8, 0, false);
> + TEST_ONE_SHIFT(0, 15, u16, 0, false);
> + TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
> + TEST_ONE_SHIFT(0, 31, u32, 0, false);
> + TEST_ONE_SHIFT(0, 63, u64, 0, false);
>
> /* Sane shift: start and end with 0, without reaching signed bit. */
> - err |= TEST_ONE_SHIFT(0, 6, s8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 14, s16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 30, int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 30, s32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 62, s64, 0, false);
> + TEST_ONE_SHIFT(0, 6, s8, 0, false);
> + TEST_ONE_SHIFT(0, 14, s16, 0, false);
> + TEST_ONE_SHIFT(0, 30, int, 0, false);
> + TEST_ONE_SHIFT(0, 30, s32, 0, false);
> + TEST_ONE_SHIFT(0, 62, s64, 0, false);
>
> /* Overflow: shifted the bit off the end. */
> - err |= TEST_ONE_SHIFT(1, 8, u8, 0, true);
> - err |= TEST_ONE_SHIFT(1, 16, u16, 0, true);
> - err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(1, 32, u32, 0, true);
> - err |= TEST_ONE_SHIFT(1, 64, u64, 0, true);
> + TEST_ONE_SHIFT(1, 8, u8, 0, true);
> + TEST_ONE_SHIFT(1, 16, u16, 0, true);
> + TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
> + TEST_ONE_SHIFT(1, 32, u32, 0, true);
> + TEST_ONE_SHIFT(1, 64, u64, 0, true);
>
> /* Overflow: shifted into the signed bit. */
> - err |= TEST_ONE_SHIFT(1, 7, s8, 0, true);
> - err |= TEST_ONE_SHIFT(1, 15, s16, 0, true);
> - err |= TEST_ONE_SHIFT(1, 31, int, 0, true);
> - err |= TEST_ONE_SHIFT(1, 31, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1, 63, s64, 0, true);
> + TEST_ONE_SHIFT(1, 7, s8, 0, true);
> + TEST_ONE_SHIFT(1, 15, s16, 0, true);
> + TEST_ONE_SHIFT(1, 31, int, 0, true);
> + TEST_ONE_SHIFT(1, 31, s32, 0, true);
> + TEST_ONE_SHIFT(1, 63, s64, 0, true);
>
> /* Overflow: high bit falls off unsigned types. */
> /* 10010110 */
> - err |= TEST_ONE_SHIFT(150, 1, u8, 0, true);
> + TEST_ONE_SHIFT(150, 1, u8, 0, true);
> /* 1000100010010110 */
> - err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true);
> + TEST_ONE_SHIFT(34966, 1, u16, 0, true);
> /* 10000100000010001000100010010110 */
> - err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
> - err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
> + TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
> + TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
> /* 1000001000010000010000000100000010000100000010001000100010010110 */
> - err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
> + TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
>
> /* Overflow: bit shifted into signed bit on signed types. */
> /* 01001011 */
> - err |= TEST_ONE_SHIFT(75, 1, s8, 0, true);
> + TEST_ONE_SHIFT(75, 1, s8, 0, true);
> /* 0100010001001011 */
> - err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true);
> + TEST_ONE_SHIFT(17483, 1, s16, 0, true);
> /* 01000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
> + TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
> + TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
> /* 0100000100001000001000000010000001000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
> + TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
>
> /* Overflow: bit shifted past signed bit on signed types. */
> /* 01001011 */
> - err |= TEST_ONE_SHIFT(75, 2, s8, 0, true);
> + TEST_ONE_SHIFT(75, 2, s8, 0, true);
> /* 0100010001001011 */
> - err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true);
> + TEST_ONE_SHIFT(17483, 2, s16, 0, true);
> /* 01000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
> - err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
> + TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
> + TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
> /* 0100000100001000001000000010000001000010000001000100010001001011 */
> - err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
> + TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
>
> /* Overflow: values larger than destination type. */
> - err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
> - err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
> + TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
> + TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
> + TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
> + TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
> + TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
> + TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
> + TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
>
> /* Nonsense: negative initial value. */
> - err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true);
> - err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true);
> - err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true);
> - err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true);
> - err |= TEST_ONE_SHIFT(-10, 0, int, 0, true);
> - err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true);
> - err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true);
> - err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
> - err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
> + TEST_ONE_SHIFT(-1, 0, s8, 0, true);
> + TEST_ONE_SHIFT(-1, 0, u8, 0, true);
> + TEST_ONE_SHIFT(-5, 0, s16, 0, true);
> + TEST_ONE_SHIFT(-5, 0, u16, 0, true);
> + TEST_ONE_SHIFT(-10, 0, int, 0, true);
> + TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
> + TEST_ONE_SHIFT(-100, 0, s32, 0, true);
> + TEST_ONE_SHIFT(-100, 0, u32, 0, true);
> + TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
> + TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
>
> /* Nonsense: negative shift values. */
> - err |= TEST_ONE_SHIFT(0, -5, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, -5, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, -10, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, -10, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, -15, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
> - err |= TEST_ONE_SHIFT(0, -20, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, -20, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, -30, s64, 0, true);
> - err |= TEST_ONE_SHIFT(0, -30, u64, 0, true);
> + TEST_ONE_SHIFT(0, -5, s8, 0, true);
> + TEST_ONE_SHIFT(0, -5, u8, 0, true);
> + TEST_ONE_SHIFT(0, -10, s16, 0, true);
> + TEST_ONE_SHIFT(0, -10, u16, 0, true);
> + TEST_ONE_SHIFT(0, -15, int, 0, true);
> + TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
> + TEST_ONE_SHIFT(0, -20, s32, 0, true);
> + TEST_ONE_SHIFT(0, -20, u32, 0, true);
> + TEST_ONE_SHIFT(0, -30, s64, 0, true);
> + TEST_ONE_SHIFT(0, -30, u64, 0, true);
>
> /* Overflow: shifted at or beyond entire type's bit width. */
> - err |= TEST_ONE_SHIFT(0, 8, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 9, u8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 8, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 9, s8, 0, true);
> - err |= TEST_ONE_SHIFT(0, 16, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 17, u16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 16, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 17, s16, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, u32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, int, 0, true);
> - err |= TEST_ONE_SHIFT(0, 32, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 33, s32, 0, true);
> - err |= TEST_ONE_SHIFT(0, 64, u64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 65, u64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 64, s64, 0, true);
> - err |= TEST_ONE_SHIFT(0, 65, s64, 0, true);
> + TEST_ONE_SHIFT(0, 8, u8, 0, true);
> + TEST_ONE_SHIFT(0, 9, u8, 0, true);
> + TEST_ONE_SHIFT(0, 8, s8, 0, true);
> + TEST_ONE_SHIFT(0, 9, s8, 0, true);
> + TEST_ONE_SHIFT(0, 16, u16, 0, true);
> + TEST_ONE_SHIFT(0, 17, u16, 0, true);
> + TEST_ONE_SHIFT(0, 16, s16, 0, true);
> + TEST_ONE_SHIFT(0, 17, s16, 0, true);
> + TEST_ONE_SHIFT(0, 32, u32, 0, true);
> + TEST_ONE_SHIFT(0, 33, u32, 0, true);
> + TEST_ONE_SHIFT(0, 32, int, 0, true);
> + TEST_ONE_SHIFT(0, 33, int, 0, true);
> + TEST_ONE_SHIFT(0, 32, s32, 0, true);
> + TEST_ONE_SHIFT(0, 33, s32, 0, true);
> + TEST_ONE_SHIFT(0, 64, u64, 0, true);
> + TEST_ONE_SHIFT(0, 65, u64, 0, true);
> + TEST_ONE_SHIFT(0, 64, s64, 0, true);
> + TEST_ONE_SHIFT(0, 65, s64, 0, true);
>
> /*
> * Corner case: for unsigned types, we fail when we've shifted
> @@ -472,17 +441,14 @@ static int __init test_overflow_shift(void)
> * signed bit). So, for now, we will test this condition but
> * mark it as not expected to overflow.
> */
> - err |= TEST_ONE_SHIFT(0, 7, s8, 0, false);
> - err |= TEST_ONE_SHIFT(0, 15, s16, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, int, 0, false);
> - err |= TEST_ONE_SHIFT(0, 31, s32, 0, false);
> - err |= TEST_ONE_SHIFT(0, 63, s64, 0, false);
> -
> - pr_info("%d shift tests finished\n", count);
> + TEST_ONE_SHIFT(0, 7, s8, 0, false);
> + TEST_ONE_SHIFT(0, 15, s16, 0, false);
> + TEST_ONE_SHIFT(0, 31, int, 0, false);
> + TEST_ONE_SHIFT(0, 31, s32, 0, false);
> + TEST_ONE_SHIFT(0, 63, s64, 0, false);
>
> + kunit_info(test, "%d shift tests finished\n", count);
> #undef TEST_ONE_SHIFT
> -
> - return err;
> }
>
> /*
> @@ -502,7 +468,7 @@ static int __init test_overflow_shift(void)
> #define TEST_SIZE (5 * 4096)
>
> #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
> -static int __init test_ ## func (void *arg) \
> +static void test_ ## func (struct kunit *test, void *arg) \
> { \
> volatile size_t a = TEST_SIZE; \
> volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \
> @@ -510,30 +476,24 @@ static int __init test_ ## func (void *arg) \
> \
> /* Tiny allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
> - if (!ptr) { \
> - pr_warn(#func " failed regular allocation?!\n"); \
> - return 1; \
> - } \
> + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
> + #func " failed regular allocation?!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> \
> /* Wrapped allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
> a * b); \
> - if (!ptr) { \
> - pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \
> - return 1; \
> - } \
> + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
> + #func " unexpectedly failed bad wrapping?!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> \
> /* Saturated allocation test. */ \
> ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
> array_size(a, b)); \
> if (ptr) { \
> - pr_warn(#func " missed saturation!\n"); \
> + KUNIT_FAIL(test, #func " missed saturation!\n"); \
> free ## want_arg (free_func, arg, ptr); \
> - return 1; \
> } \
> - return 0; \
> }
>
> /*
> @@ -554,44 +514,38 @@ DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1);
> DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0);
> DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0);
>
> -static int __init test_overflow_allocation(void)
> +static void overflow_allocation_test(struct kunit *test)
> {
> const char device_name[] = "overflow-test";
> struct device *dev;
> int count = 0;
> - int err = 0;
>
> -#define check_allocation_overflow(alloc) ({ \
> +#define check_allocation_overflow(alloc) do { \
> count++; \
> - test_ ## alloc(dev); \
> -})
> + test_ ## alloc(test, dev); \
> +} while (0)
>
> /* Create dummy device for devm_kmalloc()-family tests. */
> dev = root_device_register(device_name);
> - if (IS_ERR(dev)) {
> - pr_warn("Cannot register test device\n");
> - return 1;
> - }
> -
> - err |= check_allocation_overflow(kmalloc);
> - err |= check_allocation_overflow(kmalloc_node);
> - err |= check_allocation_overflow(kzalloc);
> - err |= check_allocation_overflow(kzalloc_node);
> - err |= check_allocation_overflow(__vmalloc);
> - err |= check_allocation_overflow(kvmalloc);
> - err |= check_allocation_overflow(kvmalloc_node);
> - err |= check_allocation_overflow(kvzalloc);
> - err |= check_allocation_overflow(kvzalloc_node);
> - err |= check_allocation_overflow(devm_kmalloc);
> - err |= check_allocation_overflow(devm_kzalloc);
> + KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
> + "Cannot register test device\n");
> +
> + check_allocation_overflow(kmalloc);
> + check_allocation_overflow(kmalloc_node);
> + check_allocation_overflow(kzalloc);
> + check_allocation_overflow(kzalloc_node);
> + check_allocation_overflow(__vmalloc);
> + check_allocation_overflow(kvmalloc);
> + check_allocation_overflow(kvmalloc_node);
> + check_allocation_overflow(kvzalloc);
> + check_allocation_overflow(kvzalloc_node);
> + check_allocation_overflow(devm_kmalloc);
> + check_allocation_overflow(devm_kzalloc);
>
> device_unregister(dev);
>
> - pr_info("%d allocation overflow tests finished\n", count);
> -
> + kunit_info(test, "%d allocation overflow tests finished\n", count);
> #undef check_allocation_overflow
> -
> - return err;
> }
>
> struct __test_flex_array {
> @@ -600,127 +554,118 @@ struct __test_flex_array {
> unsigned long data[];
"> };
>
> -static int __init test_overflow_size_helpers(void)
> +static void overflow_size_helpers_test(struct kunit *test)
> {
> /* Make sure struct_size() can be used in a constant expression. */
> u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
> struct __test_flex_array *obj;
> int count = 0;
> - int err = 0;
> int var;
> volatile int unconst = 0;
Where does this variable declaration (and its use below) come from?
It's not in the version of the "overflow: Implement size_t saturating
arithmetic helpers" patch in linux-next:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=6312fc63aee9d2fef2f9c4d42e57e5b46828f0dc
It all works if I add it in manually, but it does make applying the
change as-is something of a pain.
>
> /* Verify constant expression against runtime version. */
> var = 55;
> OPTIMIZER_HIDE_VAR(var);
> - err |= sizeof(ce_array) != struct_size(obj, data, var);
> + KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var));
>
> -#define check_one_size_helper(expected, func, args...) ({ \
> - bool __failure = false; \
> - size_t _r; \
> - \
> - _r = func(args); \
> - if (_r != (expected)) { \
> - pr_warn("expected " #func "(" #args ") " \
> - "to return %zu but got %zu instead\n", \
> - (size_t)(expected), _r); \
> - __failure = true; \
> - } \
> +#define check_one_size_helper(expected, func, args...) do { \
> + size_t _r = func(args); \
> + KUNIT_EXPECT_EQ_MSG(test, _r, expected, \
> + "expected " #func "(" #args ") to return %zu but got %zu instead\n", \
> + (size_t)(expected), _r); \
> count++; \
> - __failure; \
> -})
> +} while (0)
>
> var = 4;
> - err |= check_one_size_helper(20, size_mul, var++, 5);
> - err |= check_one_size_helper(20, size_mul, 4, var++);
> - err |= check_one_size_helper(0, size_mul, 0, 3);
> - err |= check_one_size_helper(0, size_mul, 3, 0);
> - err |= check_one_size_helper(6, size_mul, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
> + check_one_size_helper(20, size_mul, var++, 5);
> + check_one_size_helper(20, size_mul, 4, var++);
> + check_one_size_helper(0, size_mul, 0, 3);
> + check_one_size_helper(0, size_mul, 3, 0);
> + check_one_size_helper(6, size_mul, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
> + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
>
> var = 4;
> - err |= check_one_size_helper(9, size_add, var++, 5);
> - err |= check_one_size_helper(9, size_add, 4, var++);
> - err |= check_one_size_helper(9, size_add, 9, 0);
> - err |= check_one_size_helper(9, size_add, 0, 9);
> - err |= check_one_size_helper(5, size_add, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
> + check_one_size_helper(9, size_add, var++, 5);
> + check_one_size_helper(9, size_add, 4, var++);
> + check_one_size_helper(9, size_add, 9, 0);
> + check_one_size_helper(9, size_add, 0, 9);
> + check_one_size_helper(5, size_add, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
> + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
>
> var = 4;
> - err |= check_one_size_helper(1, size_sub, var--, 3);
> - err |= check_one_size_helper(1, size_sub, 4, var--);
> - err |= check_one_size_helper(1, size_sub, 3, 2);
> - err |= check_one_size_helper(9, size_sub, 9, 0);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
> - err |= check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
> - err |= check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
> - err |= check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
> - err |= check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
> + check_one_size_helper(1, size_sub, var--, 3);
> + check_one_size_helper(1, size_sub, 4, var--);
> + check_one_size_helper(1, size_sub, 3, 2);
> + check_one_size_helper(9, size_sub, 9, 0);
> + check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
> + check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
> + check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
> + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
> + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
> + check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
> + check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
> + check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
> + check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
> + check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
>
> var = 4;
> - err |= check_one_size_helper(4 * sizeof(*obj->data),
> - flex_array_size, obj, data, var++);
> - err |= check_one_size_helper(5 * sizeof(*obj->data),
> - flex_array_size, obj, data, var++);
> - err |= check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
> - err |= check_one_size_helper(sizeof(*obj->data),
> - flex_array_size, obj, data, 1 + unconst);
> - err |= check_one_size_helper(7 * sizeof(*obj->data),
> - flex_array_size, obj, data, 7 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - flex_array_size, obj, data, -1 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
> + check_one_size_helper(4 * sizeof(*obj->data),
> + flex_array_size, obj, data, var++);
> + check_one_size_helper(5 * sizeof(*obj->data),
> + flex_array_size, obj, data, var++);
> + check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
> + check_one_size_helper(sizeof(*obj->data),
> + flex_array_size, obj, data, 1 + unconst);
> + check_one_size_helper(7 * sizeof(*obj->data),
> + flex_array_size, obj, data, 7 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + flex_array_size, obj, data, -1 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
>
+ all these uses of "unconst" here and below.
> var = 4;
> - err |= check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
> - struct_size, obj, data, var++);
> - err |= check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
> - struct_size, obj, data, var++);
> - err |= check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
> - err |= check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
> - struct_size, obj, data, 1 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - struct_size, obj, data, -3 + unconst);
> - err |= check_one_size_helper(SIZE_MAX,
> - struct_size, obj, data, SIZE_MAX - 3 + unconst);
> -
> - pr_info("%d overflow size helper tests finished\n", count);
> -
> - return err;
> + check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
> + struct_size, obj, data, var++);
> + check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
> + struct_size, obj, data, var++);
> + check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
> + check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
> + struct_size, obj, data, 1 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + struct_size, obj, data, -3 + unconst);
> + check_one_size_helper(SIZE_MAX,
> + struct_size, obj, data, SIZE_MAX - 3 + unconst);
> +
> + kunit_info(test, "%d overflow size helper tests finished\n", count);
> +#undef check_one_size_helper
> }
>
> -static int __init test_module_init(void)
> -{
> - int err = 0;
> -
> - err |= test_overflow_calculation();
> - err |= test_overflow_shift();
> - err |= test_overflow_size_helpers();
> - err |= test_overflow_allocation();
> -
> - if (err) {
> - pr_warn("FAIL!\n");
> - err = -EINVAL;
> - } else {
> - pr_info("all tests passed\n");
> - }
> +static struct kunit_case overflow_test_cases[] = {
> + KUNIT_CASE(u8_overflow_test),
> + KUNIT_CASE(s8_overflow_test),
> + KUNIT_CASE(u16_overflow_test),
> + KUNIT_CASE(s16_overflow_test),
> + KUNIT_CASE(u32_overflow_test),
> + KUNIT_CASE(s32_overflow_test),
> +#if BITS_PER_LONG == 64
> + KUNIT_CASE(u64_overflow_test),
> + KUNIT_CASE(s64_overflow_test),
> +#endif
> + KUNIT_CASE(overflow_shift_test),
> + KUNIT_CASE(overflow_allocation_test),
> + KUNIT_CASE(overflow_size_helpers_test),
> + {}
> +};
>
> - return err;
> -}
> +static struct kunit_suite overflow_test_suite = {
> + .name = "overflow",
> + .test_cases = overflow_test_cases,
> +};
>
> -static void __exit test_module_exit(void)
> -{ }
> +kunit_test_suite(overflow_test_suite);
>
> -module_init(test_module_init);
> -module_exit(test_module_exit);
> MODULE_LICENSE("Dual MIT/GPL");
> --
> 2.30.2
>
> --
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On Fri, Feb 25, 2022 at 03:57:17PM +0800, David Gow wrote:
> On Thu, Feb 24, 2022 at 1:48 PM Kees Cook <[email protected]> wrote:
> >
> > Convert overflow unit tests to KUnit, for better integration into the
> > kernel self test framework. Includes a rename of test_overflow.c to
> > overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
> >
> > $ ./tools/testing/kunit/kunit.py config
> > ...
> (This 'config' step should be unnecessary... See below)
Ah yeah. I've removed that now.
> > $ ./tools/testing/kunit/kunit.py run overflow
> > ...
> > [14:33:51] Starting KUnit Kernel (1/1)...
> > [14:33:51] ============================================================
> > [14:33:51] ================== overflow (11 subtests) ==================
> > [14:33:51] [PASSED] u8_overflow_test
> > [14:33:51] [PASSED] s8_overflow_test
> > [14:33:51] [PASSED] u16_overflow_test
> > [14:33:51] [PASSED] s16_overflow_test
> > [14:33:51] [PASSED] u32_overflow_test
> > [14:33:51] [PASSED] s32_overflow_test
> > [14:33:51] [PASSED] u64_overflow_test
> > [14:33:51] [PASSED] s64_overflow_test
> > [14:33:51] [PASSED] overflow_shift_test
> > [14:33:51] [PASSED] overflow_allocation_test
> > [14:33:51] [PASSED] overflow_size_helpers_test
> > [14:33:51] ==================== [PASSED] overflow =====================
> > [14:33:51] ============================================================
> > [14:33:51] Testing complete. Passed: 11, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0
> > [14:33:51] Elapsed time: 12.525s total, 0.001s configuring, 12.402s building, 0.101s running
> >
> > Cc: David Gow <[email protected]>
> > Cc: Rasmus Villemoes <[email protected]>
> > Cc: Nick Desaulniers <[email protected]>
> > Co-developed-by: Vitor Massaru Iha <[email protected]>
> > Signed-off-by: Vitor Massaru Iha <[email protected]>
> > Link: https://lore.kernel.org/lkml/[email protected]/
> > Co-developed-by: Daniel Latypov <[email protected]>
> > Signed-off-by: Daniel Latypov <[email protected]>
> > Link: https://lore.kernel.org/linux-kselftest/[email protected]/
> > Acked-by: Nick Desaulniers <[email protected]>
> > Link: https://lore.kernel.org/lkml/CAKwvOdm62iA1dNiC6Q11UJ-MnTqtc4kXkm-ubPaFMK824_k0nw@mail.gmail.com
> > Signed-off-by: Kees Cook <[email protected]>
> > ---
> > v1: https://lore.kernel.org/lkml/[email protected]/
> > v2: Fixed up the authorship more, pulled in other prior changes (Daniel)
>
> This looks good to me. Some of the test cases _could_ probably be done
> as parameterised tests (given they're already basically table-driven),
> but I admit that could end up being excessively verbose.
In the end there was so much churn already I decided to leave it as-is.
> Apart from my not being able to find a tree this applies cleanly on,
> the tests work well here.
Ah, sorry about that! (More below...)
> Reviewed-by: David Gow <[email protected]>
Thanks!
> [...]
> > @@ -600,127 +554,118 @@ struct __test_flex_array {
> > unsigned long data[];
> "> };
> >
> > -static int __init test_overflow_size_helpers(void)
> > +static void overflow_size_helpers_test(struct kunit *test)
> > {
> > /* Make sure struct_size() can be used in a constant expression. */
> > u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
> > struct __test_flex_array *obj;
> > int count = 0;
> > - int err = 0;
> > int var;
> > volatile int unconst = 0;
>
> Where does this variable declaration (and its use below) come from?
> It's not in the version of the "overflow: Implement size_t saturating
> arithmetic helpers" patch in linux-next:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=6312fc63aee9d2fef2f9c4d42e57e5b46828f0dc
>
> It all works if I add it in manually, but it does make applying the
> change as-is something of a pain.
Ah, thanks for noticing that! It looks like I failed to send an update
for that patch. I'll resend this portion of my tree.
-Kees
--
Kees Cook
Hi,
On Wed, Feb 23, 2022 at 09:48:25PM -0800, Kees Cook wrote:
> Convert overflow unit tests to KUnit, for better integration into the
> kernel self test framework. Includes a rename of test_overflow.c to
> overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
>
This patch results in lots of test build failures
due to large frame sizes.
Building i386:allyesconfig ... failed
--------------
Error log:
lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
lib/overflow_kunit.c:644:1: error: the frame size of 2480 bytes is larger than 2048 bytes
Building i386:allmodconfig ... failed
--------------
Error log:
lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
lib/overflow_kunit.c:644:1: error: the frame size of 2480 bytes is larger than 2048 bytes
Building mips:allmodconfig ... failed
--------------
Error log:
lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
lib/overflow_kunit.c:644:1: error: the frame size of 2864 bytes is larger than 2048 bytes
Building powerpc:allmodconfig ... failed
--------------
Error log:
lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
lib/overflow_kunit.c:644:1: error: the frame size of 3904 bytes is larger than 2048 bytes
Guenter
On Wed, Mar 23, 2022 at 10:29 AM Guenter Roeck <[email protected]> wrote:
>
> Hi,
>
> On Wed, Feb 23, 2022 at 09:48:25PM -0800, Kees Cook wrote:
> > Convert overflow unit tests to KUnit, for better integration into the
> > kernel self test framework. Includes a rename of test_overflow.c to
> > overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST.
> >
>
> This patch results in lots of test build failures
> due to large frame sizes.
>
> Building i386:allyesconfig ... failed
> --------------
> Error log:
> lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
> lib/overflow_kunit.c:644:1: error: the frame size of 2480 bytes is larger than 2048 bytes
This is somewhat expected and should hopefully be fixed soon.
More detail:
Unless optimized away by the compiler, each KUNIT_EXPECT_* use will
add a struct to the stack.
I have a number of pending patches that will decrease that stack usage.
On UML (x86_64), they cut it down from 88 bytes => 32 bytes per
KUNIT_EXPECT_EQ/GT/etc.
Shuah sent a PR to Linus which contains these patches,
https://lore.kernel.org/all/[email protected]/
Once those are in, hopefully all these warnings go away as we're not
over the 2048 limit by that much.
Daniel