netdev - Re: [PATCH net-next v4 2/4] net: socket: add sockopts blacklist for BPF cgroup hook

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Date:   Thu, 13 Apr 2023 16:38:35 +0200
From:   Aleksandr Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, daniel@...earbox.net,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        David Ahern <dsahern@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Christian Brauner <brauner@...nel.org>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        linux-arch@...r.kernel.org, sdf@...gle.com
Subject: Re: [PATCH net-next v4 2/4] net: socket: add sockopts blacklist for
 BPF cgroup hook

On Thu, Apr 13, 2023 at 4:22 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Thu, Apr 13, 2023 at 3:35 PM Alexander Mikhalitsyn
> <aleksandr.mikhalitsyn@...onical.com> wrote:
> >
> > During work on SO_PEERPIDFD, it was discovered (thanks to Christian),
> > that bpf cgroup hook can cause FD leaks when used with sockopts which
> > install FDs into the process fdtable.
> >
> > After some offlist discussion it was proposed to add a blacklist of
>
> We try to replace this word by either denylist or blocklist, even in changelogs.

Hi Eric,

Oh, I'm sorry about that. :( Sure.

>
> > socket options those can cause troubles when BPF cgroup hook is enabled.
> >
>
> Can we find the appropriate Fixes: tag to help stable teams ?

Sure, I will add next time.

Fixes: 0d01da6afc54 ("bpf: implement getsockopt and setsockopt hooks")

I think it's better to add Stanislav Fomichev to CC.

Kind regards,
Alex

>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Eric Dumazet <edumazet@...gle.com>
> > Cc: Jakub Kicinski <kuba@...nel.org>
> > Cc: Paolo Abeni <pabeni@...hat.com>
> > Cc: Leon Romanovsky <leon@...nel.org>
> > Cc: David Ahern <dsahern@...nel.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Kees Cook <keescook@...omium.org>
> > Cc: Christian Brauner <brauner@...nel.org>
> > Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
> > Cc: Lennart Poettering <mzxreary@...inter.de>
> > Cc: linux-kernel@...r.kernel.org
> > Cc: netdev@...r.kernel.org
> > Cc: linux-arch@...r.kernel.org
> > Suggested-by: Daniel Borkmann <daniel@...earbox.net>
> > Suggested-by: Christian Brauner <brauner@...nel.org>
> > Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
>
> Thanks.