linux-kernel - Re: [PATCH AUTOSEL 6.3 5/7] riscv: Unconditionnally select KASAN

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Date:   Fri, 12 May 2023 11:51:03 +0200
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Björn Töpel <bjorn@...osinc.com>,
        Palmer Dabbelt <palmer@...osinc.com>, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 6.3 5/7] riscv: Unconditionnally select
 KASAN_VMALLOC if KASAN

Hi Sasha,

On 5/9/23 05:54, Sasha Levin wrote:
> From: Alexandre Ghiti <alexghiti@...osinc.com>
>
> [ Upstream commit 864046c512c2cd8418dc928b91981fb12a80396c ]
>
> If KASAN is enabled, VMAP_STACK depends on KASAN_VMALLOC so enable
> KASAN_VMALLOC with KASAN so that we can enable VMAP_STACK by default.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> Reviewed-by: Björn Töpel <bjorn@...osinc.com>
> Link: https://lore.kernel.org/r/20230203075232.274282-7-alexghiti@rivosinc.com
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>   arch/riscv/Kconfig | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index eb7f29a412f87..d6aad84efb95e 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -118,6 +118,7 @@ config RISCV
>   	select HAVE_SYSCALL_TRACEPOINTS
>   	select IRQ_DOMAIN
>   	select IRQ_FORCED_THREADING
> +	select KASAN_VMALLOC if KASAN
>   	select MODULES_USE_ELF_RELA if MODULES
>   	select MODULE_SECTIONS if MODULES
>   	select OF


KASAN_VMALLOC is broken for any kernel < 6.4, so this one should not be 
backported to any kernel (5.15, 6.1, 6.2, 6.3).

Thanks,

Alex