linux-kernel - Re: [PATCH] net/mlx4_en: Introduce flexible array to silence overflow warning

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Date:   Tue, 21 Feb 2023 00:40:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     tariqt@...dia.com, joskera@...hat.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        yishaih@...dia.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net/mlx4_en: Introduce flexible array to silence overflow
 warning

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Sat, 18 Feb 2023 10:38:50 -0800 you wrote:
> The call "skb_copy_from_linear_data(skb, inl + 1, spc)" triggers a FORTIFY
> memcpy() warning on ppc64 platform:
> 
> In function ‘fortify_memcpy_chk’,
>     inlined from ‘skb_copy_from_linear_data’ at ./include/linux/skbuff.h:4029:2,
>     inlined from ‘build_inline_wqe’ at drivers/net/ethernet/mellanox/mlx4/en_tx.c:722:4,
>     inlined from ‘mlx4_en_xmit’ at drivers/net/ethernet/mellanox/mlx4/en_tx.c:1066:3:
> ./include/linux/fortify-string.h:513:25: error: call to ‘__write_overflow_field’ declared with
> attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()?
> [-Werror=attribute-warning]
>   513 |                         __write_overflow_field(p_size_field, size);
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - net/mlx4_en: Introduce flexible array to silence overflow warning
    https://git.kernel.org/netdev/net-next/c/f8f185e39b4d

You are awesome, thank you!
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