linux-kernel - Re: [PATCH] kasan: Fix tests by removing -ffreestanding

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Date:   Wed, 12 Jul 2023 18:12:13 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Huacai Chen <chenhuacai@...ngson.cn>,
        Marco Elver <elver@...gle.com>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Huacai Chen <chenhuacai@...nel.org>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: Fix tests by removing -ffreestanding

On Wed, Jul 12, 2023 at 12:14 PM Huacai Chen <chenhuacai@...ngson.cn> wrote:
>
> CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX hopes -fbuiltin for memset()/
> memcpy()/memmove() if instrumentation is needed. This is the default
> behavior but some archs pass -ffreestanding which implies -fno-builtin,
> and then causes some kasan tests fail. So we remove -ffreestanding for
> kasan tests.

Could you clarify on which architecture you observed tests failures?

>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  mm/kasan/Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/mm/kasan/Makefile b/mm/kasan/Makefile
> index 7634dd2a6128..edd1977a6b88 100644
> --- a/mm/kasan/Makefile
> +++ b/mm/kasan/Makefile
> @@ -45,7 +45,9 @@ CFLAGS_KASAN_TEST += -fno-builtin
>  endif
>
>  CFLAGS_kasan_test.o := $(CFLAGS_KASAN_TEST)
> +CFLAGS_REMOVE_kasan_test.o := -ffreestanding
>  CFLAGS_kasan_test_module.o := $(CFLAGS_KASAN_TEST)
> +CFLAGS_REMOVE_kasan_test_module.o := -ffreestanding
>
>  obj-y := common.o report.o
>  obj-$(CONFIG_KASAN_GENERIC) += init.o generic.o report_generic.o shadow.o quarantine.o
> --
> 2.39.3

+Marco