linux-kernel - Re: [PATCH] riscv: Pass virtual addresses to kasan_mem_to

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Date:   Mon, 22 Feb 2021 18:58:20 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     alex@...ti.fr
CC:     aryabinin@...tuozzo.com, glider@...gle.com, dvyukov@...gle.com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, akpm@...ux-foundation.org, rppt@...nel.org,
        kasan-dev@...glegroups.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, alex@...ti.fr
Subject:     Re: [PATCH] riscv: Pass virtual addresses to kasan_mem_to_shadow

On Mon, 22 Feb 2021 00:07:34 PST (-0800), alex@...ti.fr wrote:
> kasan_mem_to_shadow translates virtual addresses to kasan shadow
> addresses whereas for_each_mem_range returns physical addresses: it is
> then required to use __va on those addresses before passing them to
> kasan_mem_to_shadow.
>
> Fixes: b10d6bca8720 ("arch, drivers: replace for_each_membock() with for_each_mem_range()")
> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
> ---
>  arch/riscv/mm/kasan_init.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
> index 4b9149f963d3..6d3b88f2c566 100644
> --- a/arch/riscv/mm/kasan_init.c
> +++ b/arch/riscv/mm/kasan_init.c
> @@ -148,8 +148,8 @@ void __init kasan_init(void)
>  			(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
>
>  	for_each_mem_range(i, &_start, &_end) {
> -		void *start = (void *)_start;
> -		void *end = (void *)_end;
> +		void *start = (void *)__va(_start);
> +		void *end = (void *)__va(_end);
>
>  		if (start >= end)
>  			break;

Thanks, but unless I'm missing something this is already in Linus' tree as
c25a053e1577 ("riscv: Fix KASAN memory mapping.").