netdev - Re: [PATCH] net: Fix suspicious RCU usage in bpf_sk_reuseport

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Message-ID: <3974013.1660769749@warthog.procyon.org.uk>
Date:   Wed, 17 Aug 2022 21:55:49 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     dhowells@...hat.com, Hawkins Jiawei <yin31149@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        bpf@...r.kernel.org, Jakub Sitnicki <jakub@...udflare.com>
Subject: Re: [PATCH] net: Fix suspicious RCU usage in bpf_sk_reuseport_detach()

Jakub Kicinski <kuba@...nel.org> wrote:

> I like your version because it documents what the lock protecting this
> field is. 
> 
> In fact should we also add && sock_owned_by_user(). Martin, WDYT? Would
> that work for reuseport? Jakub S is fixing l2tp to hold the socket lock
> while setting this field, yet most places take the callback lock...

So how do you want to proceed?  My first version of the patch with
sock_owned_by_user()?

David