linux-hardening - Re: [PATCH 11/14] net: enetc: Annotate struct enetc_psfp_gate with __counted

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Message-ID: <9bc8cfed-4577-f303-5186-0369f96cf8a7@embeddedor.com>
Date: Fri, 22 Sep 2023 19:56:49 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jakub Kicinski <kuba@...nel.org>
Cc: Claudiu Manoil <claudiu.manoil@....com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 Jamal Hadi Salim <jhs@...atatu.com>, David Ahern <dsahern@...nel.org>,
 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>, "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 11/14] net: enetc: Annotate struct enetc_psfp_gate 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 enetc_psfp_gate.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Claudiu Manoil <claudiu.manoil@....com>
> Cc: Vladimir Oltean <vladimir.oltean@....com>
> 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
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/net/ethernet/freescale/enetc/enetc_qos.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
> index 2513b44056c1..b65da49dd926 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
> @@ -443,7 +443,7 @@ struct enetc_psfp_gate {
>   	u32 num_entries;
>   	refcount_t refcount;
>   	struct hlist_node node;
> -	struct action_gate_entry entries[];
> +	struct action_gate_entry entries[] __counted_by(num_entries);
>   };
>   
>   /* Only enable the green color frame now