linux-kernel - Re: [Intel-wired-lan] [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist

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Date:   Tue, 21 Jun 2022 13:40:23 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH][next] iavf: Replace one-element array
 in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info



On 6/17/2022 9:00 AM, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping (after more than a year after I sent this patch :O):
> 
> Who can review and/or take this patch, please?

Hi Gustavo,

IIRC this could cause some issues with the expectations of the virtchnl 
structures [1] for compatibility. There was a direction that we were 
going to head to resolve this. Unfortunately, the person who, I believe, 
was going to make this change is out for a couple of weeks. I will ask 
around and see if I can get any updates on this work. Otherwise, I'll 
ask him when he returns.

Thanks,
Tony

[1] 
https://lore.kernel.org/intel-wired-lan/f2fe13346f1d44ee9047254a95914d00@intel.com/

> Thanks
> -- 
> Gustavo
> 
> On 5/26/21 01:04, Gustavo A. R. Silva wrote:
>> There is a regular need in the kernel to provide a way to declare 
>> having a
>> dynamically sized set of trailing elements in a structure. Kernel code
>> should always use “flexible array members”[1] for these cases. The older
>> style of one-element or zero-length arrays should no longer be used[2].
>>
>> Refactor the code according to the use of a flexible-array member in 
>> struct
>> virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element 
>> array,
>> and use the flex_array_size() helper.
>>
>> [1] https://en.wikipedia.org/wiki/Flexible_array_member
>> [2] 
>> https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays 
>>
>>
>> Link: https://github.com/KSPP/linux/issues/79
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>