linux-hardening - Re: [PATCH] pinctrl: uniphier: Annotate struct uniphier_pinctrl_reg_region with __counted

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Date: Sat, 23 Sep 2023 10:28:29 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Linus Walleij <linus.walleij@...aro.org>
Cc: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
 Masami Hiramatsu <mhiramat@...nel.org>, linux-gpio@...r.kernel.org,
 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] pinctrl: uniphier: Annotate struct
 uniphier_pinctrl_reg_region with __counted_by



On 9/22/23 11:50, 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 uniphier_pinctrl_reg_region.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: linux-gpio@...r.kernel.org
> 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/pinctrl/uniphier/pinctrl-uniphier-core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
> index 18d3a4f69e63..fbd0fcdb42c8 100644
> --- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
> +++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
> @@ -31,7 +31,7 @@ struct uniphier_pinctrl_reg_region {
>   	struct list_head node;
>   	unsigned int base;
>   	unsigned int nregs;
> -	u32 vals[];
> +	u32 vals[] __counted_by(nregs);
>   };
>   
>   struct uniphier_pinctrl_priv {