linux-kernel - Re: [PATCH] kasan: fix Kconfig check of CC_HAS_WORKING_NOSANITIZE

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Date:   Sun, 3 Oct 2021 19:44:48 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        Taras Madan <tarasmadan@...gle.com>
Subject: Re: [PATCH] kasan: fix Kconfig check of CC_HAS_WORKING_NOSANITIZE_ADDRESS

On Fri, Sep 10, 2021 at 10:42 AM Marco Elver <elver@...gle.com> wrote:
>
> In the main KASAN config option CC_HAS_WORKING_NOSANITIZE_ADDRESS is
> checked for instrumentation-based modes. However, if
> HAVE_ARCH_KASAN_HW_TAGS is true all modes may still be selected.
>
> To fix, also make the software modes depend on
> CC_HAS_WORKING_NOSANITIZE_ADDRESS.
>
> Fixes: 6a63a63ff1ac ("kasan: introduce CONFIG_KASAN_HW_TAGS")
> Signed-off-by: Marco Elver <elver@...gle.com>
> ---
>  lib/Kconfig.kasan | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 1e2d10f86011..cdc842d090db 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -66,6 +66,7 @@ choice
>  config KASAN_GENERIC
>         bool "Generic mode"
>         depends on HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC
> +       depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
>         select SLUB_DEBUG if SLUB
>         select CONSTRUCTORS
>         help
> @@ -86,6 +87,7 @@ config KASAN_GENERIC
>  config KASAN_SW_TAGS
>         bool "Software tag-based mode"
>         depends on HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS
> +       depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
>         select SLUB_DEBUG if SLUB
>         select CONSTRUCTORS
>         help
> --
> 2.33.0.309.g3052b89438-goog
>

Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>