linux-hardening - Re: [PATCH] nexthop: Annotate struct nh_res_table with __counted

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Message-ID: <ec1ae7b4-6563-b4ec-7eff-b1dd29d9ba8e@embeddedor.com>
Date: Wed, 4 Oct 2023 01:36:04 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, David Ahern <dsahern@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH] nexthop: Annotate struct nh_res_table with __counted_by

On 10/4/23 01:18, 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 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 nh_res_table.
> 
> Cc: David Ahern <dsahern@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>   include/net/nexthop.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/nexthop.h b/include/net/nexthop.h
> index 5dc4b4bba8a5..09f9a732e640 100644
> --- a/include/net/nexthop.h
> +++ b/include/net/nexthop.h
> @@ -92,7 +92,7 @@ struct nh_res_table {
>   	u32			unbalanced_timer;
>   
>   	u16			num_nh_buckets;
> -	struct nh_res_bucket	nh_buckets[];
> +	struct nh_res_bucket	nh_buckets[] __counted_by(num_nh_buckets);
>   };
>   
>   struct nh_grp_entry {