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From:   Aleksandr Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Date:   Thu, 13 Apr 2023 16:38:35 +0200
Message-ID: <CAEivzxcEhfLttf0VK=NmHdQxF7CRYXNm6NwUVx6jx=-u2k-T6w@mail.gmail.com>
Subject: Re: [PATCH net-next v4 2/4] net: socket: add sockopts blacklist for
 BPF cgroup hook
To:     Eric Dumazet <edumazet@google.com>
Cc:     davem@davemloft.net, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, daniel@iogearbox.net,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Leon Romanovsky <leon@kernel.org>,
        David Ahern <dsahern@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Kees Cook <keescook@chromium.org>,
        Christian Brauner <brauner@kernel.org>,
        Kuniyuki Iwashima <kuniyu@amazon.com>,
        Lennart Poettering <mzxreary@0pointer.de>,
        linux-arch@vger.kernel.org, sdf@google.com
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On Thu, Apr 13, 2023 at 4:22=E2=80=AFPM Eric Dumazet <edumazet@google.com> =
wrote:
>
> On Thu, Apr 13, 2023 at 3:35=E2=80=AFPM Alexander Mikhalitsyn
> <aleksandr.mikhalitsyn@canonical.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 chan=
gelogs.

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@davemloft.net>
> > Cc: Eric Dumazet <edumazet@google.com>
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: Paolo Abeni <pabeni@redhat.com>
> > Cc: Leon Romanovsky <leon@kernel.org>
> > Cc: David Ahern <dsahern@kernel.org>
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Kees Cook <keescook@chromium.org>
> > Cc: Christian Brauner <brauner@kernel.org>
> > Cc: Kuniyuki Iwashima <kuniyu@amazon.com>
> > Cc: Lennart Poettering <mzxreary@0pointer.de>
> > Cc: linux-kernel@vger.kernel.org
> > Cc: netdev@vger.kernel.org
> > Cc: linux-arch@vger.kernel.org
> > Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
> > Suggested-by: Christian Brauner <brauner@kernel.org>
> > Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.c=
om>
>
> Thanks.