linux-kernel - Re: [PATCH] framewarn: expand KASAN

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Date:   Thu, 20 Sep 2018 18:50:18 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>
Subject: Re: [PATCH] framewarn: expand KASAN_EXTRA exception to KASAN

This patch seems reasonable, but you emailed the wrong people :)

On Thu, Sep 20, 2018 at 5:15 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> It turns out that KASAN in general will bloat stack frames in unexpected
> ways, not just KASAN_EXTRA. So, this patch trivially changes that
> default to be associated with KASAN instead of KASAN_EXTRA.
>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
>  lib/Kconfig.debug | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 4966c4fbe7f7..39078a080e29 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -222,7 +222,7 @@ config ENABLE_MUST_CHECK
>  config FRAME_WARN
>         int "Warn for stack frames larger than (needs gcc 4.4)"
>         range 0 8192
> -       default 3072 if KASAN_EXTRA
> +       default 3072 if KASAN
>         default 2048 if GCC_PLUGIN_LATENT_ENTROPY
>         default 1280 if (!64BIT && PARISC)
>         default 1024 if (!64BIT && !PARISC)
> --
> 2.19.0
>