linux-kernel - Re: [PATCH] lib/Kconfig.debug: disable FRAME

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Date:   Wed, 18 Oct 2023 20:29:07 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     linux-kernel@...r.kernel.org,
        Rodrigo Siqueira <rodrigo.siqueira@....com>,
        Harry Wentland <harry.wentland@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Nick Terrell <terrelln@...com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>,
        Li Hua <hucool.lihua@...wei.com>,
        Alexander Potapenko <glider@...gle.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rae Moar <rmoar@...gle.com>, rust-for-linux@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] lib/Kconfig.debug: disable FRAME_WARN for kasan and kcsan

Hi Hamza,

On Wed, Oct 18, 2023 at 8:24 PM Hamza Mahfooz <hamza.mahfooz@....com> wrote:
> With every release of LLVM, both of these sanitizers eat up more and
> more of the stack. So, set FRAME_WARN to 0 if either of them is enabled
> for a given build.
>
> Cc: stable@...r.kernel.org
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Thanks for your patch!

> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -429,11 +429,10 @@ endif # DEBUG_INFO
>  config FRAME_WARN
>         int "Warn for stack frames larger than"
>         range 0 8192
> -       default 0 if KMSAN
> +       default 0 if KASAN || KCSAN || KMSAN

Are kernels with KASAN || KCSAN || KMSAN enabled supposed to be bootable?
Stack overflows do cause crashes.

>         default 2048 if GCC_PLUGIN_LATENT_ENTROPY
>         default 2048 if PARISC
>         default 1536 if (!64BIT && XTENSA)
> -       default 1280 if KASAN && !64BIT
>         default 1024 if !64BIT
>         default 2048 if 64BIT
>         help

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds