Re: [PATCH master] ARM: kasan: reserve shadow memory region

[Sascha Hauer <sha@pengutronix.de>]

On Wed, Jan 03, 2024 at 11:13:08AM +0100, Ahmad Fatoum wrote:
> We did not have any protection in place to ensure that KASAN shadow memory
> isn't overwritten during boot. Add that now to avoid strange effects
> during debugging.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  arch/arm/cpu/start.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
> index 15f5b2937227..9f4cdfe67fbf 100644
> --- a/arch/arm/cpu/start.c
> +++ b/arch/arm/cpu/start.c
> @@ -133,6 +133,10 @@ static int barebox_memory_areas_init(void)
>  		request_sdram_region("board data", (unsigned long)barebox_boarddata,
>  				     barebox_boarddata_size);
>  
> +	if (IS_ENABLED(CONFIG_KASAN))
> +		request_sdram_region("kasan shadow", kasan_shadow_base,
> +				     mem_malloc_start() - kasan_shadow_base);

This doesn't compile with CONFIG_KASAN disabled because
kasan_shadow_base is declared inside an #ifdef CONFIG_KASAN.

Could you send a v2?

Sascha

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