linux-kernel - Re: [PATCH v2] bpf: Add length check for SK_DIAG_BPF_STORAGE_REQ_MAP

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Message-ID: <7e61b9e3.e7d98.1898ba72993.Coremail.linma@zju.edu.cn>
Date:   Tue, 25 Jul 2023 14:05:35 +0800 (GMT+08:00)
From:   "Lin Ma" <linma@....edu.cn>
To:     "Leon Romanovsky" <leon@...nel.org>
Cc:     kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, ast@...nel.org, martin.lau@...nel.org,
        yhs@...com, void@...ifault.com, andrii@...nel.org,
        houtao1@...wei.com, inwardvessel@...il.com, kuniyu@...zon.com,
        songliubraving@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2] bpf: Add length check for
 SK_DIAG_BPF_STORAGE_REQ_MAP_FD parsing

Hello Leon,

> 
> My concern is related to maintainability in long run. Your check adds
> another layer of cabal knowledge which will be copied/pasted in other
> places.
> 
> Thanks
> 

Yeah, I guess you are right. I guess I should not just *fix* this issue
but also think of the maintainability. The very first idea pop into my
mind is to complete the necessary nla_policy hence the invalid nlattrs
could be rejected at the very first place.

Will spend more time on this.

Regards
Lin