Merge tag 'vfs-7.4-rc1.shared.net-next.pidfd' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull pidfd updates from Christian Brauner:
 "This adds thread specific pidfds to af_unix sockets.

  SO_PASSPIDFD and SO_PEERPIDFD hand out a pidfd for the thread-group
  leader. A coredump server on the coredump socket can't get a handle on
  the thread that took the signal and is writing the dump, and anything
  doing per-thread authentication has the same problem. The sending and
  the connecting thread are recorded in addition to the thread-group
  leader and sk_peer_pid becomes an array indexed by pid type.

  SO_PASSPIDFD_THREAD works like SO_PASSPIDFD but delivers an
  SCM_PIDFD_THREAD cmsg for the sending thread. Both options are
  independent so a receiver can ask for both. On SOCK_STREAM sockets
  recvmsg() only stops merging data at a thread boundary when the
  receiver asked for a thread pidfd. SO_PEERPIDFD_THREAD returns a pidfd
  for the thread that called connect(), listen() or socketpair(). pidfs
  records the coredump on the dumping thread's struct pid too so its
  pidfd reports it like the leader's does. Selftests for af_unix and the
  coredump socket are included"

* tag 'vfs-7.4-rc1.shared.net-next.pidfd' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  selftests/coredump: check the dumping thread's pidfd
  pidfs: record the coredump on the dumping thread's pid too
  selftests/net: SO_PEERPIDFD_THREAD
  net: add SO_PEERPIDFD_THREAD to get a thread-specific pidfd
  af_unix: record the pid of the connecting thread
  net: turn sk_peer_pid into an array indexed by pid type
  selftests/net: SO_PASSPIDFD_THREAD
  net: add SO_PASSPIDFD_THREAD to get a thread-specific SCM_PIDFD
  af_unix: record the pid of the sending thread
  pid: add helpers to operate on a struct pid array

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