linux-kernel - Re: [PATCH] kasan: add missing Kconfig dependencies

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Date:   Mon, 10 Dec 2018 22:14:57 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>, gor@...ux.ibm.com,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kasan: add missing Kconfig dependencies

On Mon, Dec 10, 2018 at 9:59 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> Building with CONFIG_KASAN=y when neither KASAN_GENERIC nor KASAN_SW_TAGS
> can be selected leads to a build error:
>
> arch/arm64/mm/kasan_init.c: In function 'kasan_pte_populate':
> arch/arm64/mm/kasan_init.c:106:28: error: 'KASAN_SHADOW_INIT' undeclared (first use in this function); did you mean 'KASAN_SHADOW_END'?
>
> We should really only allow enabling KASAN when all its dependencies
> are met as it was before the introduction of CONFIG_KASAN_SW_TAGS.
>
> Fixes: b8440cc16515 ("kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Hi Arnd,

Is this a patch against linux-next? The issue has been addressed by
v13 of the patchset, which is now in the mm tree and should end up in
the linux-next soon AFAIU.

Thanks!

> ---
>  lib/Kconfig.kasan | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index b5d0cbfce4a1..83286bca2f70 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -15,6 +15,8 @@ if HAVE_ARCH_KASAN
>
>  config KASAN
>         bool "KASAN: runtime memory debugger"
> +       depends on CC_HAS_KASAN_GENERIC || CC_HAS_KASAN_SW_TAGS
> +       depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
>         help
>           Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
>           designed to find out-of-bounds accesses and use-after-free bugs.
> --
> 2.20.0
>