netdev - Re: [PATCH 09/14] net: mana: Annotate struct hwc_dma_buf with __counted

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Date: Fri, 22 Sep 2023 19:56:10 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jakub Kicinski <kuba@...nel.org>
Cc: Long Li <longli@...rosoft.com>, Ajay Sharma <sharmaajay@...rosoft.com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 linux-rdma@...r.kernel.org, linux-hyperv@...r.kernel.org,
 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>,
 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,
 dev@...nvswitch.org, linux-parisc@...r.kernel.org, llvm@...ts.linux.dev,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 09/14] net: mana: Annotate struct hwc_dma_buf 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 hwc_dma_buf.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Long Li <longli@...rosoft.com>
> Cc: Ajay Sharma <sharmaajay@...rosoft.com>
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Wei Liu <wei.liu@...nel.org>
> Cc: Dexuan Cui <decui@...rosoft.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: linux-rdma@...r.kernel.org
> Cc: linux-hyperv@...r.kernel.org
> 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/mana/hw_channel.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/mana/hw_channel.h b/include/net/mana/hw_channel.h
> index 3d3b5c881bc1..158b125692c2 100644
> --- a/include/net/mana/hw_channel.h
> +++ b/include/net/mana/hw_channel.h
> @@ -121,7 +121,7 @@ struct hwc_dma_buf {
>   	u32 gpa_mkey;
>   
>   	u32 num_reqs;
> -	struct hwc_work_request reqs[];
> +	struct hwc_work_request reqs[] __counted_by(num_reqs);
>   };
>   
>   typedef void hwc_rx_event_handler_t(void *ctx, u32 gdma_rxq_id,