linux-hardening - Re: [PATCH 01/14] ipv4: Annotate struct fib_info with __counted

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Message-ID: <9fd84065-4191-c8c6-43fa-01eda9865dd2@embeddedor.com>
Date: Fri, 22 Sep 2023 19:43:57 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, David Ahern
 <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 Jamal Hadi Salim <jhs@...atatu.com>, Martin KaFai Lau
 <martin.lau@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>, Yisen Zhuang <yisen.zhuang@...wei.com>,
 Salil Mehta <salil.mehta@...wei.com>, Claudiu Manoil
 <claudiu.manoil@....com>, Vladimir Oltean <vladimir.oltean@....com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>,
 Ajay Sharma <sharmaajay@...rosoft.com>, Alex Elder <elder@...nel.org>,
 Pravin B Shelar <pshelar@....org>, Shaokun Zhang
 <zhangshaokun@...ilicon.com>, Cong Wang <xiyou.wangcong@...il.com>,
 Jiri Pirko <jiri@...nulli.us>, Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org,
 linux-hyperv@...r.kernel.org, linux-rdma@...r.kernel.org,
 dev@...nvswitch.org, linux-parisc@...r.kernel.org, llvm@...ts.linux.dev,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 01/14] ipv4: Annotate struct fib_info with __counted_by

On 9/22/23 11:28, 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 fib_info.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: David Ahern <dsahern@...nel.org>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   include/net/ip_fib.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
> index f0c13864180e..84b0a82c9df4 100644
> --- a/include/net/ip_fib.h
> +++ b/include/net/ip_fib.h
> @@ -156,7 +156,7 @@ struct fib_info {
>   	bool			nh_updated;
>   	struct nexthop		*nh;
>   	struct rcu_head		rcu;
> -	struct fib_nh		fib_nh[];
> +	struct fib_nh		fib_nh[] __counted_by(fib_nhs);
>   };
>   
>