Re: [PATCH] lib/Kconfig.debug: disable FRAME_WARN for kasan and kcsan

[Geert Uytterhoeven]

Hi Hamza,

On Wed, Oct 18, 2023 at 8:24 PM Hamza Mahfooz <hamza.mahfooz@xxxxxxx> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>

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@xxxxxxxxxxxxxx

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