linux-kernel - Re: [PATCH net-next v2 0/3] Add SCM_PIDFD and SO

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Message-ID: <CAEivzxd6oqxxa1=mTd7pn+MrTotOY71PuuVJDRDCLGc+NY-7oQ@mail.gmail.com>
Date:   Wed, 22 Mar 2023 15:17:58 +0100
From:   Aleksandr Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        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>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Lennart Poettering <mzxreary@...inter.de>
Subject: Re: [PATCH net-next v2 0/3] Add SCM_PIDFD and SO_PEERPIDFD

On Wed, Mar 22, 2023 at 3:13 PM Christian Brauner <brauner@...nel.org> wrote:
>
> On Tue, Mar 21, 2023 at 07:33:39PM +0100, Alexander Mikhalitsyn wrote:
> > 1. Implement SCM_PIDFD, a new type of CMSG type analogical to SCM_CREDENTIALS,
> > but it contains pidfd instead of plain pid, which allows programmers not
> > to care about PID reuse problem.
> >
> > 2. Add SO_PEERPIDFD which allows to get pidfd of peer socket holder pidfd.
> > This thing is direct analog of SO_PEERCRED which allows to get plain PID.
> >
> > 3. Add SCM_PIDFD / SO_PEERPIDFD kselftest
> >
> > Idea comes from UAPI kernel group:
> > https://uapi-group.org/kernel-features/
> >
> > Big thanks to Christian Brauner and Lennart Poettering for productive
> > discussions about this.
> >
> > 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>
> >
> > Alexander Mikhalitsyn (3):
> >   scm: add SO_PASSPIDFD and SCM_PIDFD
> >   net: core: add getsockopt SO_PEERPIDFD
> >   selftests: net: add SCM_PIDFD / SO_PEERPIDFD test
> >
> >  arch/alpha/include/uapi/asm/socket.h          |   3 +
> >  arch/mips/include/uapi/asm/socket.h           |   3 +
> >  arch/parisc/include/uapi/asm/socket.h         |   3 +
> >  arch/sparc/include/uapi/asm/socket.h          |   3 +
> >  include/linux/net.h                           |   1 +
> >  include/linux/socket.h                        |   1 +
> >  include/net/scm.h                             |  14 +-
> >  include/uapi/asm-generic/socket.h             |   3 +
> >  net/core/sock.c                               |  32 ++
> >  net/mptcp/sockopt.c                           |   1 +
> >  net/unix/af_unix.c                            |  18 +-
> >  tools/include/uapi/asm-generic/socket.h       |   3 +
> >  tools/testing/selftests/net/.gitignore        |   1 +
> >  tools/testing/selftests/net/af_unix/Makefile  |   3 +-
> >  .../testing/selftests/net/af_unix/scm_pidfd.c | 336 ++++++++++++++++++
> >  15 files changed, 417 insertions(+), 8 deletions(-)
> >  create mode 100644 tools/testing/selftests/net/af_unix/scm_pidfd.c
>
> What's the commit for this work? Because this seems to fail to apply
> cleanly on anything from v6.3-rc1 until v6.3-rc3.

It's based on net-next https://git.kernel.org/netdev/net-next/c/a02d83f9947d

Kind regards,
Alex

>