diff mbox series

lib: overflow: Convert to Kunit

Message ID 20220216224153.2242451-1-keescook@chromium.org (mailing list archive)
State Superseded
Headers show
Series lib: overflow: Convert to Kunit | expand

Commit Message

Kees Cook Feb. 16, 2022, 10:41 p.m. UTC
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 <davidgow@google.com>
Cc: Vitor Massaru Iha <vitor@massaru.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
---
Assuming no one objects, I'll carry this in my for-next/overflow tree. :)
---
 lib/Kconfig.debug                         |  16 +-
 lib/Makefile                              |   2 +-
 lib/{test_overflow.c => overflow_kunit.c} | 562 ++++++++++------------
 3 files changed, 270 insertions(+), 310 deletions(-)
 rename lib/{test_overflow.c => overflow_kunit.c} (54%)

Comments

Nick Desaulniers Feb. 16, 2022, 10:47 p.m. UTC | #1
On Wed, Feb 16, 2022 at 2:41 PM Kees Cook <keescook@chromium.org> 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.
>
> Cc: David Gow <davidgow@google.com>
> Cc: Vitor Massaru Iha <vitor@massaru.org>
> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
> Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
> Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> Assuming no one objects, I'll carry this in my for-next/overflow tree. :)

Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Daniel Latypov Feb. 16, 2022, 10:57 p.m. UTC | #2
On Wed, Feb 16, 2022 at 2:42 PM Kees Cook <keescook@chromium.org> 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

JFYI, you can run this as a one-liner via

$ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
CONFIG_KUNIT=y
CONFIG_TEST_OVERFLOW=y
EOF

The above is taken from my own duplicate version of this patch
[1] https://lore.kernel.org/linux-kselftest/20210503211536.1384578-1-dlatypov@google.com/

> ...
> [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 <davidgow@google.com>
> Cc: Vitor Massaru Iha <vitor@massaru.org>
> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
> Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
> Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Daniel Latypov <dlatypov@google.com>

Looks good to me, some minor nits/suggestions wrt KUnit usage.
Nice to see this test converted over!

> ---
> Assuming no one objects, I'll carry this in my for-next/overflow tree. :)
> ---
>  lib/Kconfig.debug                         |  16 +-
>  lib/Makefile                              |   2 +-
>  lib/{test_overflow.c => overflow_kunit.c} | 562 ++++++++++------------
>  3 files changed, 270 insertions(+), 310 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..4cc27b9926a1 100644
> --- a/lib/test_overflow.c
> +++ b/lib/overflow_kunit.c
> @@ -1,9 +1,13 @@
>  // 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

We can drop the pr_fmt now, I think

>
> +#include <kunit/test.h>
>  #include <linux/device.h>
>  #include <linux/init.h>
>  #include <linux/kernel.h>
> @@ -19,7 +23,7 @@
>                 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 +224,31 @@ 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 +262,176 @@ DEFINE_TEST_FUNC(u64, "%llu");
>  DEFINE_TEST_FUNC(s64, "%lld");
>  #endif
>
> -static int __init test_overflow_calculation(void)
> -{
> -       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)
> +static void overflow_shift_test(struct kunit *test)
>  {
> -       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 +442,14 @@ 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 +469,7 @@ 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 +477,28 @@ 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_EXPECT_FALSE_MSG(test, !ptr,                              \
> +                           #func " failed regular allocation?!\n");    \

Optional: we can consider using KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG() here.
It's a more heavy handed than just a `return` on failure, but if the
regular allocation failed, we're probably justified in bailing out on
the whole test case.

> +       if (!ptr)                                                       \
> +               return;                                                 \
>         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_EXPECT_FALSE_MSG(test, !ptr,                              \
> +                           #func " unexpectedly failed bad wrapping?!\n"); \
> +       if (!ptr)                                                       \
> +               return;                                                 \
>         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_EXPECT_FALSE_MSG(test, ptr,                               \
> +                           #func " missed saturation!\n");             \
> +       if (ptr)                                                        \

We can instead do

if (ptr) {
  KUNIT_FAIL(test, #func "missed saturation!");
 free...()
}

IMO, it's a bit easier to read that way, but not that important.

>                 free ## want_arg (free_func, arg, ptr);                 \
> -               return 1;                                               \
> -       }                                                               \
Kees Cook Feb. 17, 2022, 5:09 p.m. UTC | #3
On Wed, Feb 16, 2022 at 02:57:12PM -0800, Daniel Latypov wrote:
> On Wed, Feb 16, 2022 at 2:42 PM Kees Cook <keescook@chromium.org> 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
> 
> JFYI, you can run this as a one-liner via
> 
> $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
> CONFIG_KUNIT=y
> CONFIG_TEST_OVERFLOW=y
> EOF
> 
> The above is taken from my own duplicate version of this patch
> [1] https://lore.kernel.org/linux-kselftest/20210503211536.1384578-1-dlatypov@google.com/

Ah-ha! I thought I remembered this conversion being proposed before but
I totally failed to find it. Thank you! I'll compare/adjust this patch
and add you as Co-developed-by.

> > ...
> > [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 <davidgow@google.com>
> > Cc: Vitor Massaru Iha <vitor@massaru.org>
> > Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> > Cc: Nick Desaulniers <ndesaulniers@google.com>
> > Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
> > Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
> > Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
> > Signed-off-by: Kees Cook <keescook@chromium.org>
> 
> Reviewed-by: Daniel Latypov <dlatypov@google.com>
> 
> Looks good to me, some minor nits/suggestions wrt KUnit usage.
> Nice to see this test converted over!

Thanks!

> [...]
> > index f6530fce799d..4cc27b9926a1 100644
> > --- a/lib/test_overflow.c
> > +++ b/lib/overflow_kunit.c
> > @@ -1,9 +1,13 @@
> >  // 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
> 
> We can drop the pr_fmt now, I think

My instinct is to leave these in place just so that anything weird that
gets inlined and sneaks a pr_*() call into the code will have a
meaningful prefix.

> [...]
> > @@ -510,30 +477,28 @@ 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_EXPECT_FALSE_MSG(test, !ptr,                              \
> > +                           #func " failed regular allocation?!\n");    \
> 
> Optional: we can consider using KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG() here.
> It's a more heavy handed than just a `return` on failure, but if the
> regular allocation failed, we're probably justified in bailing out on
> the whole test case.

Yeah, I think it might work here. Earlier I hadn't figured out how to
convert each test separately, but now an ASSERT makes sense.

> 
> > +       if (!ptr)                                                       \
> > +               return;                                                 \
> >         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_EXPECT_FALSE_MSG(test, !ptr,                              \
> > +                           #func " unexpectedly failed bad wrapping?!\n"); \
> > +       if (!ptr)                                                       \
> > +               return;                                                 \
> >         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_EXPECT_FALSE_MSG(test, ptr,                               \
> > +                           #func " missed saturation!\n");             \
> > +       if (ptr)                                                        \
> 
> We can instead do
> 
> if (ptr) {
>   KUNIT_FAIL(test, #func "missed saturation!");
>  free...()
> }
> 
> IMO, it's a bit easier to read that way, but not that important.

Ah yes, good. That's much better.

I will respin and resend...
Shuah Khan Feb. 17, 2022, 5:24 p.m. UTC | #4
On 2/17/22 10:09 AM, Kees Cook wrote:
> On Wed, Feb 16, 2022 at 02:57:12PM -0800, Daniel Latypov wrote:
>> On Wed, Feb 16, 2022 at 2:42 PM Kees Cook <keescook@chromium.org> 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
>>
>> JFYI, you can run this as a one-liner via
>>
>> $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
>> CONFIG_KUNIT=y
>> CONFIG_TEST_OVERFLOW=y
>> EOF
>>
>> The above is taken from my own duplicate version of this patch
>> [1] https://lore.kernel.org/linux-kselftest/20210503211536.1384578-1-dlatypov@google.com/
> 
> Ah-ha! I thought I remembered this conversion being proposed before but
> I totally failed to find it. Thank you! I'll compare/adjust this patch
> and add you as Co-developed-by.
> 
>>> ...
>>> [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 <davidgow@google.com>
>>> Cc: Vitor Massaru Iha <vitor@massaru.org>
>>> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
>>> Cc: Nick Desaulniers <ndesaulniers@google.com>
>>> Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
>>> Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
>>> Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
>>> Signed-off-by: Kees Cook <keescook@chromium.org>
>>
>> Reviewed-by: Daniel Latypov <dlatypov@google.com>
>>

Looks good to me. I recall reviewing this when Vitor was working on this.
Glad to this happen.

Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>

thanks,
-- Shuah
Daniel Latypov Feb. 17, 2022, 7:01 p.m. UTC | #5
On Thu, Feb 17, 2022 at 9:09 AM Kees Cook <keescook@chromium.org> wrote:
>
> On Wed, Feb 16, 2022 at 02:57:12PM -0800, Daniel Latypov wrote:
> > On Wed, Feb 16, 2022 at 2:42 PM Kees Cook <keescook@chromium.org> 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
> >
> > JFYI, you can run this as a one-liner via
> >
> > $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
> > CONFIG_KUNIT=y
> > CONFIG_TEST_OVERFLOW=y
> > EOF
> >
> > The above is taken from my own duplicate version of this patch
> > [1] https://lore.kernel.org/linux-kselftest/20210503211536.1384578-1-dlatypov@google.com/
>
> Ah-ha! I thought I remembered this conversion being proposed before but
> I totally failed to find it. Thank you! I'll compare/adjust this patch
> and add you as Co-developed-by.

There's a lot that's already identical line for line.
I think I pointed to all the places where they differed in any
meaningful way down below.
So you can probably save yourself the time of looking over.

And yeah, I vaguely remembered that Vitor had worked on it, but
somehow failed to find that as well.
Something about this test :)

>
> > > ...
> > > [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 <davidgow@google.com>
> > > Cc: Vitor Massaru Iha <vitor@massaru.org>
> > > Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> > > Cc: Nick Desaulniers <ndesaulniers@google.com>
> > > Co-developed-by: Vitor Massaru Iha <vitor@massaru.org>
> > > Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
> > > Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/
> > > Signed-off-by: Kees Cook <keescook@chromium.org>
> >
> > Reviewed-by: Daniel Latypov <dlatypov@google.com>
> >
> > Looks good to me, some minor nits/suggestions wrt KUnit usage.
> > Nice to see this test converted over!
>
> Thanks!
>
> > [...]
> > > index f6530fce799d..4cc27b9926a1 100644
> > > --- a/lib/test_overflow.c
> > > +++ b/lib/overflow_kunit.c
> > > @@ -1,9 +1,13 @@
> > >  // 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
> >
> > We can drop the pr_fmt now, I think
>
> My instinct is to leave these in place just so that anything weird that
> gets inlined and sneaks a pr_*() call into the code will have a
> meaningful prefix.

Ack, sounds good.
We've historically dropped it and assumed we'd use kunit_info() for
all the pr_*()'s we cared about.

But there's definitely concern that some macro might use it to print
an important and relevant message, hmm.
diff mbox series

Patch

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..4cc27b9926a1 100644
--- a/lib/test_overflow.c
+++ b/lib/overflow_kunit.c
@@ -1,9 +1,13 @@ 
 // 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>
@@ -19,7 +23,7 @@ 
 		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 +224,31 @@  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 +262,176 @@  DEFINE_TEST_FUNC(u64, "%llu");
 DEFINE_TEST_FUNC(s64, "%lld");
 #endif
 
-static int __init test_overflow_calculation(void)
-{
-	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)
+static void overflow_shift_test(struct kunit *test)
 {
-	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 +442,14 @@  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 +469,7 @@  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 +477,28 @@  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_EXPECT_FALSE_MSG(test, !ptr,				\
+			    #func " failed regular allocation?!\n");	\
+	if (!ptr)							\
+		return;							\
 	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_EXPECT_FALSE_MSG(test, !ptr,				\
+			    #func " unexpectedly failed bad wrapping?!\n"); \
+	if (!ptr)							\
+		return;							\
 	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_EXPECT_FALSE_MSG(test, ptr,				\
+			    #func " missed saturation!\n");		\
+	if (ptr)							\
 		free ## want_arg (free_func, arg, ptr);			\
-		return 1;						\
-	}								\
-	return 0;							\
 }
 
 /*
@@ -554,44 +519,38 @@  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 +559,118 @@  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");