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

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Message-ID: <CAG_fn=V9FXGpqceojn0UGiPi7gFbDbRnObc-N5a55Qk=XQy=kg@mail.gmail.com>
Date:   Fri, 29 Sep 2023 16:05:42 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Joey Jiao <quic_jiangenj@...cinc.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     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

(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?

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