linux-hardening - Re: [PATCH] power: supply: axp20x_ac_power: Annotate struct axp20x_ac_power with __counted

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Date: Sat, 23 Sep 2023 11:04:21 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Sebastian Reichel <sre@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	linux-pm@...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, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] power: supply: axp20x_ac_power: Annotate struct
 axp20x_ac_power with __counted_by

On Fri, Sep 22, 2023 at 10:53:55AM -0700, 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 axp20x_ac_power.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Sebastian Reichel <sre@...nel.org>
> Cc: Chen-Yu Tsai <wens@...e.org>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>  drivers/power/supply/axp20x_ac_power.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
> index 19a118633115..e5733cb9e19e 100644
> --- a/drivers/power/supply/axp20x_ac_power.c
> +++ b/drivers/power/supply/axp20x_ac_power.c
> @@ -45,7 +45,7 @@ struct axp20x_ac_power {
>  	struct iio_channel *acin_i;
>  	bool has_acin_path_sel;
>  	unsigned int num_irqs;
> -	unsigned int irqs[];
> +	unsigned int irqs[] __counted_by(num_irqs);
>  };
>  
>  static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
> -- 
> 2.34.1
> 
>