linux-kernel - Re: [PATCH] Input: Annotate struct ff_device with __counted

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Message-ID: <07438cd0-0bd2-4505-a787-cc30b2340719@embeddedor.com>
Date:   Fri, 6 Oct 2023 22:47:35 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-input@...r.kernel.org, linux-hardening@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] Input: Annotate struct ff_device with __counted_by



On 10/6/23 22:17, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct ff_device.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: linux-input@...r.kernel.org
> Cc: linux-hardening@...r.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
-- 
Gustavo

> ---
>   include/linux/input.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/input.h b/include/linux/input.h
> index 49790c1bd2c4..de6503c0edb8 100644
> --- a/include/linux/input.h
> +++ b/include/linux/input.h
> @@ -562,7 +562,7 @@ struct ff_device {
>   
>   	int max_effects;
>   	struct ff_effect *effects;
> -	struct file *effect_owners[];
> +	struct file *effect_owners[] __counted_by(max_effects);
>   };
>   
>   int input_ff_create(struct input_dev *dev, unsigned int max_effects);