linux-hardening - Re: [PATCH v2][next] net/smc: Avoid -Wflex-array-member-not-at-end warnings

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Date: Sun, 24 Mar 2024 21:22:25 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Wen Gu <guwen@...ux.alibaba.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Wenjia Zhang <wenjia@...ux.ibm.com>, Jan Karcher <jaka@...ux.ibm.com>,
 "D. Wythe" <alibuda@...ux.alibaba.com>, Tony Lu <tonylu@...ux.alibaba.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-s390@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
 Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2][next] net/smc: Avoid -Wflex-array-member-not-at-end
 warnings

>> diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
>> index e55026c7529c..63bb5745ab54 100644
>> --- a/net/smc/smc_clc.c
>> +++ b/net/smc/smc_clc.c
>> @@ -853,8 +853,9 @@ int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
>>       pclc_smcd = &pclc->pclc_smcd;
>>       pclc_prfx = &pclc->pclc_prfx;
>>       ipv6_prfx = pclc->pclc_prfx_ipv6;
>> -    v2_ext = &pclc->pclc_v2_ext;
>> -    smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
>> +    v2_ext = container_of(&pclc->pclc_v2_ext, struct smc_clc_v2_extension, fixed);
> checkpatch complained 'WARNING: line length of 86 exceeds 80 columns' here.

I could probably change this.

> 
> It can be reproduced by:
> 
> ./scripts/checkpatch.pl --strict --max-line-length=80 
> --ignore=COMMIT_LOG_LONG_LINE,MACRO_ARG_REUSE,ALLOC_SIZEOF_STRUCT,NO_AUTHOR_SIGN_OFF,GIT_COMMIT_ID,CAMELCASE xxx.patch
> 
>> +    smcd_v2_ext = container_of(&pclc->pclc_smcd_v2_ext,
>> +                   struct smc_clc_smcd_v2_extension, fixed);
>>       gidchids = pclc->pclc_gidchids;
>>       trl = &pclc->pclc_trl;
>> diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
>> index 7cc7070b9772..2bfb51daf468 100644
>> --- a/net/smc/smc_clc.h
>> +++ b/net/smc/smc_clc.h
>> @@ -134,12 +134,14 @@ struct smc_clc_smcd_gid_chid {
>>                */
>>   struct smc_clc_v2_extension {
>> -    struct smc_clnt_opts_area_hdr hdr;
>> -    u8 roce[16];        /* RoCEv2 GID */
>> -    u8 max_conns;
>> -    u8 max_links;
>> -    __be16 feature_mask;
>> -    u8 reserved[12];
>> +    struct_group_tagged(smc_clc_v2_extension_fixed, fixed,
>> +        struct smc_clnt_opts_area_hdr hdr;
> 
> checkpatch: 'CHECK: Alignment should match open parenthesis'

I think the code looks better as is --without aligning to match the parenthesis.

--
Gustavo