linux-kernel - Re: [PATCH 1/2] kasan: Improve and simplify Kconfig.kasan

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Date:   Mon, 29 Jun 2020 15:34:38 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>, Daniel Axtens <dja@...ens.net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 1/2] kasan: Improve and simplify Kconfig.kasan

On Mon, Jun 29, 2020 at 12:42 PM Marco Elver <elver@...gle.com> wrote:
>
> Turn 'KASAN' into a menuconfig, to avoid cluttering its parent menu with
> the suboptions if enabled. Use 'if KASAN ... endif' instead of having
> to 'depend on KASAN' for each entry.
>
> Signed-off-by: Marco Elver <elver@...gle.com>
> ---
>  lib/Kconfig.kasan | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 34b84bcbd3d9..89053defc0d9 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -18,7 +18,7 @@ config CC_HAS_KASAN_SW_TAGS
>  config CC_HAS_WORKING_NOSANITIZE_ADDRESS
>         def_bool !CC_IS_GCC || GCC_VERSION >= 80300
>
> -config KASAN
> +menuconfig KASAN
>         bool "KASAN: runtime memory debugger"
>         depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \
>                    (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)
> @@ -29,9 +29,10 @@ config KASAN
>           designed to find out-of-bounds accesses and use-after-free bugs.
>           See Documentation/dev-tools/kasan.rst for details.
>
> +if KASAN
> +
>  choice
>         prompt "KASAN mode"
> -       depends on KASAN
>         default KASAN_GENERIC
>         help
>           KASAN has two modes: generic KASAN (similar to userspace ASan,
> @@ -88,7 +89,6 @@ endchoice
>
>  choice
>         prompt "Instrumentation type"
> -       depends on KASAN
>         default KASAN_OUTLINE
>
>  config KASAN_OUTLINE
> @@ -113,7 +113,6 @@ endchoice
>
>  config KASAN_STACK_ENABLE
>         bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
> -       depends on KASAN
>         help
>           The LLVM stack address sanitizer has a know problem that
>           causes excessive stack usage in a lot of functions, see
> @@ -134,7 +133,7 @@ config KASAN_STACK
>
>  config KASAN_S390_4_LEVEL_PAGING
>         bool "KASan: use 4-level paging"
> -       depends on KASAN && S390
> +       depends on S390
>         help
>           Compiling the kernel with KASan disables automatic 3-level vs
>           4-level paging selection. 3-level paging is used by default (up
> @@ -151,7 +150,7 @@ config KASAN_SW_TAGS_IDENTIFY
>
>  config KASAN_VMALLOC
>         bool "Back mappings in vmalloc space with real shadow memory"
> -       depends on KASAN && HAVE_ARCH_KASAN_VMALLOC
> +       depends on HAVE_ARCH_KASAN_VMALLOC
>         help
>           By default, the shadow region for vmalloc space is the read-only
>           zero page. This means that KASAN cannot detect errors involving
> @@ -164,8 +163,10 @@ config KASAN_VMALLOC
>
>  config TEST_KASAN
>         tristate "Module for testing KASAN for bug detection"
> -       depends on m && KASAN
> +       depends on m
>         help
>           This is a test module doing various nasty things like
>           out of bounds accesses, use after free. It is useful for testing
>           kernel debugging features like KASAN.
> +
> +endif # KASAN
> --
> 2.27.0.212.ge8ba1cc988-goog
>

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