Merge tag 'vfs-6.17-rc1.coredump' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull coredump updates from Christian Brauner:
 "This contains an extension to the coredump socket and a proper rework
  of the coredump code.

   - This extends the coredump socket to allow the coredump server to
     tell the kernel how to process individual coredumps. This allows
     for fine-grained coredump management. Userspace can decide to just
     let the kernel write out the coredump, or generate the coredump
     itself, or just reject it.

     * COREDUMP_KERNEL
       The kernel will write the coredump data to the socket.

     * COREDUMP_USERSPACE
       The kernel will not write coredump data but will indicate to the
       parent that a coredump has been generated. This is used when
       userspace generates its own coredumps.

     * COREDUMP_REJECT
       The kernel will skip generating a coredump for this task.

     * COREDUMP_WAIT
       The kernel will prevent the task from exiting until the coredump
       server has shutdown the socket connection.

     The flexible coredump socket can be enabled by using the "@@"
     prefix instead of the single "@" prefix for the regular coredump
     socket:

       @@/run/systemd/coredump.socket

   - Cleanup the coredump code properly while we have to touch it
     anyway.

     Split out each coredump mode in a separate helper so it's easy to
     grasp what is going on and make the code easier to follow. The core
     coredump function should now be very trivial to follow"

* tag 'vfs-6.17-rc1.coredump' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (31 commits)
  cleanup: add a scoped version of CLASS()
  coredump: add coredump_skip() helper
  coredump: avoid pointless variable
  coredump: order auto cleanup variables at the top
  coredump: add coredump_cleanup()
  coredump: auto cleanup prepare_creds()
  cred: add auto cleanup method
  coredump: directly return
  coredump: auto cleanup argv
  coredump: add coredump_write()
  coredump: use a single helper for the socket
  coredump: move pipe specific file check into coredump_pipe()
  coredump: split pipe coredumping into coredump_pipe()
  coredump: move core_pipe_count to global variable
  coredump: prepare to simplify exit paths
  coredump: split file coredumping into coredump_file()
  coredump: rename do_coredump() to vfs_coredump()
  selftests/coredump: make sure invalid paths are rejected
  coredump: validate socket path in coredump_parse()
  coredump: don't allow ".." in coredump socket path
  ...

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