netdev - Re: [PATCH bpf-next v2 1/4] net: add SO_NETNS

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Date:   Fri, 19 Feb 2021 16:32:32 +0100
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Lorenz Bauer <lmb@...udflare.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: [PATCH bpf-next v2 1/4] net: add SO_NETNS_COOKIE socket option



On 2/19/21 1:23 PM, Lorenz Bauer wrote:
> On Fri, 19 Feb 2021 at 11:49, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>
>>> +     case SO_NETNS_COOKIE:
>>> +             lv = sizeof(u64);
>>> +             if (len < lv)
>>> +                     return -EINVAL;
>>
>>         if (len != lv)
>>                 return -EINVAL;
>>
>> (There is no reason to support bigger value before at least hundred years)
> 
> Sorry that was copy pasta from SO_COOKIE which uses the same check. I'll
> change it to your suggestion. Want me to fix SO_COOKIE as well?

Unfortunately it is too late for SO_COOKIE

Some applications might use len = 256, and just look at what the kernel
gives back.

Better be strict at the time a feature is added, instead of having
to maintain legacy stuff.