linux-hardening - Re: [PATCH] memory: atmel-ebi: Annotate struct atmel_ebi_dev with __counted

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Message-ID: <b98d51d3-5fbf-e627-4ffe-46392a28a447@embeddedor.com>
Date: Sat, 23 Sep 2023 10:35:17 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>,
 linux-arm-kernel@...ts.infradead.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,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] memory: atmel-ebi: Annotate struct atmel_ebi_dev with
 __counted_by

On 9/22/23 11:52, 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 checking 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 atmel_ebi_dev.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Claudiu Beznea <claudiu.beznea@...on.dev>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/memory/atmel-ebi.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
> index 635966d705cb..ec6100bc94c5 100644
> --- a/drivers/memory/atmel-ebi.c
> +++ b/drivers/memory/atmel-ebi.c
> @@ -30,7 +30,7 @@ struct atmel_ebi_dev {
>   	struct atmel_ebi *ebi;
>   	u32 mode;
>   	int numcs;
> -	struct atmel_ebi_dev_config configs[];
> +	struct atmel_ebi_dev_config configs[] __counted_by(numcs);
>   };
>   
>   struct atmel_ebi_caps {