Merge tag 'namespace-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull namespace updates from Christian Brauner:

 - Reject uid_map, gid_map and projid_map values that don't fit in a
   u32.

   map_write() parsed with simple_strtoul() and truncated modulo 2^32 on
   64-bit so "4294967301 1000 1" was installed as "5 1000 1" without an
   error. Each field is parsed with kstrtou32() now and selftests cover
   the out-of-range, negative and in-range cases. This isn't a security
   fix. The truncated values were valid ids and every later check still
   applied to them.

 - Annotate struct uid_gid_map's forward and reverse pointers with
   __counted_by_ptr and add a KUnit suite for inserting and sorting
   extents.

   insert_extent() wrote to forward[nr_extents] before bumping the count
   which the annotation flags, so it bumps first now. Two follow-up
   fixes rename the now global helpers to uid_gid_map_insert_extent()
   and uid_gid_map_sort(), since the btrfs self-tests have their own
   insert_extent(), and guard the declarations on CONFIG_KUNIT.

 - Drop the BUG_ON() NULL checks in copy_mnt_ns() and copy_utsname().
   create_new_namespaces() always passes a valid pointer and the other
   copy_*_ns() helpers don't check either.

 - Remove a dead key_put() on the create_user_ns() error path.

* tag 'namespace-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  selftests/namespaces: add uid_map/gid_map range tests
  userns: reject uid_map/gid_map values that do not fit in u32
  userns: declare the KUnit-visible helpers whenever KUnit is enabled
  userns: rename insert_extent() and sort_idmaps()
  userns: Add KUnit test suite for uid_gid_map
  userns: Add __counted_by_ptr attribute to struct uid_gid_map
  fs: namespace: drop BUG_ON() in copy_mnt_ns()
  uts: drop BUG_ON() in copy_utsname()
  userns: remove dead key_put() on the create_user_ns() error path

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