linux-kernel - Re: [PATCH] kasan: Add CONFIG_KASAN_WHITELIST

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Date:   Sat, 30 Sep 2023 19:12:26 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     Joey Jiao <quic_jiangenj@...cinc.com>, kasan-dev@...glegroups.com,
        quic_likaid@...cinc.com, Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kasan: Add CONFIG_KASAN_WHITELIST_ONLY mode

On Fri, Sep 29, 2023 at 11:06 PM Alexander Potapenko <glider@...gle.com> wrote:
>
> (CC Masahiro Yamada)
>
> On Thu, Sep 28, 2023 at 6:16 AM Joey Jiao <quic_jiangenj@...cinc.com> wrote:
> >
> > Fow low memory device, full enabled kasan just not work.
> > Set KASAN_SANITIZE to n when CONFIG_KASAN_WHITELIST_ONLY=y.
> > So we can enable kasan for single file or module.
>
> I don't have technical objections here, but it bothers me a bit that
> we are adding support for KASAN_SANITIZE:=y, although nobody will be
> adding KASAN_SANITIZE:=y to upstream Makefiles - only development
> kernels when debugging on low-end devices.
>
> Masahiro, is this something worth having in upstream Kconfig code?


Even if we apply this patch to the upstream,
you will end up with adding 'KASAN_SANITIZE :=y'
to the single file/Makefile.

I am not convinced with this patch
since this nod is not so useful standalone.



> > Signed-off-by: Joey Jiao <quic_jiangenj@...cinc.com>
> Reviewed-by: Alexander Potapenko <glider@...gle.com>



--
Best Regards
Masahiro Yamada