linux-hardening - Re: [PATCH] interconnect: Annotate struct icc_path with __counted

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Date:   Thu, 17 Aug 2023 15:01:59 -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: Annotate struct icc_path with __counted_by



On 8/17/23 14:41, 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_path.
> 
> [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/internal.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/interconnect/internal.h b/drivers/interconnect/internal.h
> index f5f82a5c939e..b30856db523d 100644
> --- a/drivers/interconnect/internal.h
> +++ b/drivers/interconnect/internal.h
> @@ -38,7 +38,7 @@ struct icc_req {
>   struct icc_path {
>   	const char *name;
>   	size_t num_nodes;
> -	struct icc_req reqs[];
> +	struct icc_req reqs[] __counted_by(num_nodes);
>   };
>   
>   #endif