linux-hardening - Re: [PATCH v2 6/9] kunit: memcpy: Mark tests as slow using test attributes

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Date:   Tue, 25 Jul 2023 16:42:30 +0800
From:   David Gow <davidgow@...gle.com>
To:     Rae Moar <rmoar@...gle.com>
Cc:     shuah@...nel.org, dlatypov@...gle.com, brendan.higgins@...ux.dev,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        linux-hardening@...r.kernel.org, jstultz@...gle.com,
        tglx@...utronix.de, sboyd@...nel.org
Subject: Re: [PATCH v2 6/9] kunit: memcpy: Mark tests as slow using test attributes

On Tue, 25 Jul 2023 at 00:30, Rae Moar <rmoar@...gle.com> wrote:
>
> Mark slow memcpy KUnit tests using test attributes.
>
> Tests marked as slow are as follows: memcpy_large_test, memmove_test,
> memmove_large_test, and memmove_overlap_test. These tests were the slowest
> of the memcpy tests and relatively slower to most other KUnit tests. Most
> of these tests are already skipped when CONFIG_MEMCPY_SLOW_KUNIT_TEST is
> not enabled.
>
> These tests can now be filtered using the KUnit test attribute filtering
> feature. Example: --filter "speed>slow". This will run only the tests that
> have speeds faster than slow. The slow attribute will also be outputted in
> KTAP.
>
> Note: This patch is intended to replace the use of
> CONFIG_MEMCPY_SLOW_KUNIT_TEST and to potentially deprecate this feature.
> This patch does not remove the config option but does add a note to the
> config definition commenting on this future shift.
>
> Acked-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Rae Moar <rmoar@...gle.com>
> ---

Reviewed-by: David Gow <davidgow@...gle.com>

Thanks,
-- David

>
> Changes since v1:
> - No changes.
> Changes since RFC v2:
> - No changes.
> Changes since RFC v1:
> - Added note under CONFIG_MEMCPY_SLOW_KUNIT_TEST.
>
>  lib/Kconfig.debug  | 3 +++
>  lib/memcpy_kunit.c | 8 ++++----
>  2 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 550cb967b668..1b3894e861f2 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2701,6 +2701,9 @@ config MEMCPY_SLOW_KUNIT_TEST
>           and bit ranges. These can be very slow, so they are split out
>           as a separate config, in case they need to be disabled.
>
> +         Note this config option will be replaced by the use of KUnit test
> +         attributes.
> +
>  config IS_SIGNED_TYPE_KUNIT_TEST
>         tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
>         depends on KUNIT
> diff --git a/lib/memcpy_kunit.c b/lib/memcpy_kunit.c
> index 887926f04731..440aee705ccc 100644
> --- a/lib/memcpy_kunit.c
> +++ b/lib/memcpy_kunit.c
> @@ -551,10 +551,10 @@ static void strtomem_test(struct kunit *test)
>  static struct kunit_case memcpy_test_cases[] = {
>         KUNIT_CASE(memset_test),
>         KUNIT_CASE(memcpy_test),
> -       KUNIT_CASE(memcpy_large_test),
> -       KUNIT_CASE(memmove_test),
> -       KUNIT_CASE(memmove_large_test),
> -       KUNIT_CASE(memmove_overlap_test),
> +       KUNIT_CASE_SLOW(memcpy_large_test),
> +       KUNIT_CASE_SLOW(memmove_test),
> +       KUNIT_CASE_SLOW(memmove_large_test),
> +       KUNIT_CASE_SLOW(memmove_overlap_test),
>         KUNIT_CASE(strtomem_test),
>         {}
>  };
> --
> 2.41.0.487.g6d72f3e995-goog
>

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