netdev - Re: [PATCH 08/14] net: ipa: Annotate struct ipa_power with __counted

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Date: Fri, 22 Sep 2023 19:55:43 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jakub Kicinski <kuba@...nel.org>
Cc: Alex Elder <elder@...nel.org>, "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>, 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>, 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 08/14] net: ipa: Annotate struct ipa_power 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 ipa_power.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Alex Elder <elder@...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
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/net/ipa/ipa_power.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ipa/ipa_power.c b/drivers/net/ipa/ipa_power.c
> index 0eaa7a7f3343..e223886123ce 100644
> --- a/drivers/net/ipa/ipa_power.c
> +++ b/drivers/net/ipa/ipa_power.c
> @@ -67,7 +67,7 @@ struct ipa_power {
>   	spinlock_t spinlock;	/* used with STOPPED/STARTED power flags */
>   	DECLARE_BITMAP(flags, IPA_POWER_FLAG_COUNT);
>   	u32 interconnect_count;
> -	struct icc_bulk_data interconnect[];
> +	struct icc_bulk_data interconnect[] __counted_by(interconnect_count);
>   };
>   
>   /* Initialize interconnects required for IPA operation */