linux-kernel - Re: [PATCH] ARM: tegra: Use io memcpy to write to iram

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Message-ID: <CALHNRZ_7Yv98v83JvYLP2MmUZj+EDPwk7dDDArN4_U5docbRCw@mail.gmail.com>
Date: Wed, 28 May 2025 12:45:23 -0500
From: Aaron Kling <webgeek1234@...il.com>
To: webgeek1234@...il.com
Cc: Russell King <linux@...linux.org.uk>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, linux-arm-kernel@...ts.infradead.org, 
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: tegra: Use io memcpy to write to iram

On Thu, May 22, 2025 at 11:11 AM Aaron Kling via B4 Relay
<devnull+webgeek1234.gmail.com@...nel.org> wrote:
>
> From: Aaron Kling <webgeek1234@...il.com>
>
> Kasan crashes the kernel trying to check boundaries when using the
> normal memcpy.
>
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
> Change-Id: I27714f45aa6aea6a7bee048f706b14b8c7535164
> ---
>  arch/arm/mach-tegra/reset.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/mach-tegra/reset.c b/arch/arm/mach-tegra/reset.c
> index d5c805adf7a82b938bebd8941eae974cf6bcdbe3..ea706fac63587a393a17fe0f1c2ad69d6e5c14f2 100644
> --- a/arch/arm/mach-tegra/reset.c
> +++ b/arch/arm/mach-tegra/reset.c
> @@ -63,7 +63,7 @@ static void __init tegra_cpu_reset_handler_enable(void)
>         BUG_ON(is_enabled);
>         BUG_ON(tegra_cpu_reset_handler_size > TEGRA_IRAM_RESET_HANDLER_SIZE);
>
> -       memcpy(iram_base, (void *)__tegra_cpu_reset_handler_start,
> +       memcpy_toio(iram_base, (void *)__tegra_cpu_reset_handler_start,
>                         tegra_cpu_reset_handler_size);
>
>         err = call_firmware_op(set_cpu_boot_addr, 0, reset_address);
>
> ---
> base-commit: d608703fcdd9e9538f6c7a0fcf98bf79b1375b60
> change-id: 20250522-mach-tegra-kasan-fabd0253f268
>
> Best regards,
> --
> Aaron Kling <webgeek1234@...il.com>
>
>

Friendly reminder about this patch.

Sincerely,
Aaron