linux-hardening - Re: [PATCH] interconnect: icc-clk: Annotate struct icc_clk_provider with __counted

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Date:   Thu, 17 Aug 2023 14:57:06 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Georgi Djakov <djakov@...nel.org>
Cc:     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] interconnect: icc-clk: Annotate struct icc_clk_provider
 with __counted_by



On 8/17/23 14:29, 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 icc_clk_provider.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Georgi Djakov <djakov@...nel.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/interconnect/icc-clk.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/interconnect/icc-clk.c b/drivers/interconnect/icc-clk.c
> index 4d43ebff4257..d787f2ea36d9 100644
> --- a/drivers/interconnect/icc-clk.c
> +++ b/drivers/interconnect/icc-clk.c
> @@ -16,7 +16,7 @@ struct icc_clk_node {
>   struct icc_clk_provider {
>   	struct icc_provider provider;
>   	int num_clocks;
> -	struct icc_clk_node clocks[];
> +	struct icc_clk_node clocks[] __counted_by(num_clocks);
>   };
>   
>   #define to_icc_clk_provider(_provider) \