linux-kernel - Re: [PATCH] nfp: Annotate struct nfp_reprs with __counted

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Message-ID: <63f3d89e-41f3-65c7-0a29-fb667960243f@embeddedor.com>
Date:   Wed, 4 Oct 2023 01:39:32 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Simon Horman <horms@...nel.org>
Cc:     Simon Horman <simon.horman@...igine.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, oss-drivers@...igine.com,
        netdev@...r.kernel.org, Louis Peens <louis.peens@...igine.com>,
        "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] nfp: Annotate struct nfp_reprs 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 nfp_reprs.
> 
> Cc: Simon Horman <simon.horman@...igine.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: oss-drivers@...igine.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

> ---
>   drivers/net/ethernet/netronome/nfp/nfp_net_repr.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> index 48a74accbbd3..77bf4198dbde 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_repr.h
> @@ -18,7 +18,7 @@ struct nfp_port;
>    */
>   struct nfp_reprs {
>   	unsigned int num_reprs;
> -	struct net_device __rcu *reprs[];
> +	struct net_device __rcu *reprs[] __counted_by(num_reprs);
>   };
>   
>   /**