linux-hardening - Re: [PATCH] media: i2c: Annotate struct i2c_atr with __counted

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Date: Sat, 23 Sep 2023 10:56:49 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Wolfram Sang <wsa@...nel.org>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, linux-i2c@...r.kernel.org,
	llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] media: i2c: Annotate struct i2c_atr with __counted_by

On Fri, Sep 22, 2023 at 10:54:25AM -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 i2c_atr.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Wolfram Sang <wsa@...nel.org>
> Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> Cc: Luca Ceresoli <luca.ceresoli@...tlin.com>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Tom Rix <trix@...hat.com>
> Cc: linux-i2c@...r.kernel.org
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>  drivers/i2c/i2c-atr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
> index 8ca1daadec93..f21475ae5921 100644
> --- a/drivers/i2c/i2c-atr.c
> +++ b/drivers/i2c/i2c-atr.c
> @@ -94,7 +94,7 @@ struct i2c_atr {
>  
>  	struct notifier_block i2c_nb;
>  
> -	struct i2c_adapter *adapter[];
> +	struct i2c_adapter *adapter[] __counted_by(max_adapters);
>  };
>  
>  static struct i2c_atr_alias_pair *
> -- 
> 2.34.1
> 
>