linux-kernel - Re: [PATCH 4/4] kmsan: add memsetXX tests

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Date:   Thu, 2 Mar 2023 12:22:39 +0100
From:   Marco Elver <elver@...gle.com>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        akpm@...ux-foundation.org, dvyukov@...gle.com, nathan@...nel.org,
        ndesaulniers@...gle.com, kasan-dev@...glegroups.com
Subject: Re: [PATCH 4/4] kmsan: add memsetXX tests

On Wed, 1 Mar 2023 at 15:39, Alexander Potapenko <glider@...gle.com> wrote:
>
> Add tests ensuring that memset16()/memset32()/memset64() are
> instrumented by KMSAN and correctly initialize the memory.
>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> ---
>  mm/kmsan/kmsan_test.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
> index cc98a3f4e0899..e450a000441fb 100644
> --- a/mm/kmsan/kmsan_test.c
> +++ b/mm/kmsan/kmsan_test.c
> @@ -503,6 +503,25 @@ static void test_memcpy_aligned_to_unaligned2(struct kunit *test)
>         KUNIT_EXPECT_TRUE(test, report_matches(&expect));
>  }
>
> +/* Generate test cases for memset16(), memset32(), memset64(). */
> +#define DEFINE_TEST_MEMSETXX(size, var_ty)                                  \
> +       static void test_memset##size(struct kunit *test)                   \
> +       {                                                                   \
> +               EXPECTATION_NO_REPORT(expect);                              \
> +               volatile var_ty uninit;                                     \

This could just be 'uint##size##_t' and you can drop 'var_ty'.

> +                                                                            \
> +               kunit_info(test,                                            \
> +                          "memset" #size "() should initialize memory\n"); \
> +               DO_NOT_OPTIMIZE(uninit);                                    \
> +               memset##size((var_ty *)&uninit, 0, 1);                      \
> +               kmsan_check_memory((void *)&uninit, sizeof(uninit));        \
> +               KUNIT_EXPECT_TRUE(test, report_matches(&expect));           \
> +       }
> +
> +DEFINE_TEST_MEMSETXX(16, uint16_t)
> +DEFINE_TEST_MEMSETXX(32, uint32_t)
> +DEFINE_TEST_MEMSETXX(64, uint64_t)
> +
>  static noinline void fibonacci(int *array, int size, int start)
>  {
>         if (start < 2 || (start == size))
> @@ -549,6 +568,9 @@ static struct kunit_case kmsan_test_cases[] = {
>         KUNIT_CASE(test_memcpy_aligned_to_aligned),
>         KUNIT_CASE(test_memcpy_aligned_to_unaligned),
>         KUNIT_CASE(test_memcpy_aligned_to_unaligned2),
> +       KUNIT_CASE(test_memset16),
> +       KUNIT_CASE(test_memset32),
> +       KUNIT_CASE(test_memset64),
>         KUNIT_CASE(test_long_origin_chain),
>         {},
>  };
> --
> 2.39.2.722.g9855ee24e9-goog
>