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References: <20230303141433.3422671-1-glider@google.com> <20230303141433.3422671-4-glider@google.com>
In-Reply-To: <20230303141433.3422671-4-glider@google.com>
From:   Marco Elver <elver@google.com>
Date:   Fri, 3 Mar 2023 16:00:28 +0100
Message-ID: <CANpmjNP8OaOvY02VHqy3JMeDxVzfHguZG8PHhMOKKPjK-Q73Bg@mail.gmail.com>
Subject: Re: [PATCH 4/4] kmsan: add memsetXX tests
To:     Alexander Potapenko <glider@google.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org,
        dave.hansen@linux.intel.com, hpa@zytor.com,
        akpm@linux-foundation.org, dvyukov@google.com, nathan@kernel.org,
        ndesaulniers@google.com, kasan-dev@googlegroups.com
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Precedence: bulk

On Fri, 3 Mar 2023 at 15:14, 'Alexander Potapenko' via kasan-dev
<kasan-dev@googlegroups.com> wrote:
>
> Add tests ensuring that memset16()/memset32()/memset64() are
> instrumented by KMSAN and correctly initialize the memory.
>
> Signed-off-by: Alexander Potapenko <glider@google.com>
> ---
> v2:
>  - drop a redundant parameter of DEFINE_TEST_MEMSETXX()

Reviewed-by: Marco Elver <elver@google.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 aeddfdd4f679f..7095d3fbb23ac 100644
> --- a/mm/kmsan/kmsan_test.c
> +++ b/mm/kmsan/kmsan_test.c
> @@ -504,6 +504,25 @@ 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)                                          \
> +       static void test_memset##size(struct kunit *test)                   \
> +       {                                                                   \
> +               EXPECTATION_NO_REPORT(expect);                              \
> +               volatile uint##size##_t uninit;                             \
> +                                                                            \
> +               kunit_info(test,                                            \
> +                          "memset" #size "() should initialize memory\n"); \
> +               DO_NOT_OPTIMIZE(uninit);                                    \
> +               memset##size((uint##size##_t *)&uninit, 0, 1);              \
> +               kmsan_check_memory((void *)&uninit, sizeof(uninit));        \
> +               KUNIT_EXPECT_TRUE(test, report_matches(&expect));           \
> +       }
> +
> +DEFINE_TEST_MEMSETXX(16)
> +DEFINE_TEST_MEMSETXX(32)
> +DEFINE_TEST_MEMSETXX(64)
> +
>  static noinline void fibonacci(int *array, int size, int start)
>  {
>         if (start < 2 || (start == size))
> @@ -550,6 +569,9 @@ 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),
>         {},
>  };
> --
> 2.40.0.rc0.216.gc4246ad0f0-goog
>
> --
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