[PATCH ghak59 V2 0/6] audit: config_change normalizations and event record gathering

[Richard Guy Briggs]

Make a number of changes to normalize CONFIG_CHANGE records by adding
missing op= fields, providing more information in existing op fields and
connecting all records to existing audit events.

The user record patch is included but is *optional* since there is doubt
that we want to disconnect the records from a single event.

Since tree purge records are processed after the EOE record is produced,
the order of operation of the EOE record and the purge will have to be
reversed so that the purge records can be included in the event.

For reference, here are the calling methods and function tree for all
CONFIG_CHANGE events:
- audit_log_config_change() "op=set"
        - AUDIT_SET:AUDIT_STATUS_PID
        - AUDIT_SET:AUDIT_STATUS_LOST
        - audit_do_config_change()
                - AUDIT_SET:AUDIT_STATUS_FAILURE
                - AUDIT_SET:AUDIT_STATUS_ENABLED
                - AUDIT_SET:AUDIT_STATUS_RATE_LIMIT
                - AUDIT_SET:AUDIT_STATUS_BACKLOG_LIMIT
                - AUDIT_SET:AUDIT_STATUS_BACKLOG_WAIT_TIME
- audit_log_common_recv_msg()
        - AUDIT_*USER* events (not CONFIG_CHANGE like all the rest)
        - AUDIT_LOCKED "op=%s_rule"(add/remove)
        - AUDIT_TRIM "op=trim"
        - AUDIT_MAKE_EQUIV: "op=make_equiv"
        - AUDIT_TTY_SET: "op=tty_set"
- audit_log_rule_change()
        - AUDIT_ADD_RULE -F dir=:
        - AUDIT_DEL_RULE -F dir=:
- audit_mark_log_rule_change()
        - audit_autoremove_mark_rule() "op=autoremove_rule(mark)"
                - audit_mark_handle_event()
                        - audit_mark_fsnotify_ops.handle_event
- audit_tree_log_remove_rule() "op=remove_rule(tree:%s)" from kill_rules()
        - from trim_marked()
                - AUDIT_TRIM: audit_trim_trees() "trim"
                - audit_add_tree_rule() iterate_mounts err "add"
                        - audit_add_rule()
                                - audit_rule_change()
                                        - AUDIT_ADD_RULE -F dir=:
                - AUDIT_MAKE_EQUIV: audit_tag_tree() iterate_mounts err "equiv"
        - from audit_kill_trees()
                - __audit_free() "free"
                        - do_exit()
                        - copy_process() err
                - __audit_syscall_exit() "exit"
        - from evict_chunk() "evict"
                - audit_tree_freeing_mark()
                        - audit_tree_ops.freeing_mark
- audit_watch_log_rule_change()
        - audit_update_watch() "updated_rules(watch:inval)" : "updated_rules(watch:set)"
                - audit_watch_handle_event() FS_CREATE|FS_MOVED_TO, FS_DELETE|FS_MOVED_FROM
                        - audit_watch_fsnotify_ops.handle_event
        - audit_remove_parent_watches() "remove_rule(watch:parent)"
                - audit_watch_handle_event() FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF
                        - audit_watch_fsnotify_ops.handle_event

See: https://github.com/linux-audit/audit-kernel/issues/50
See: https://github.com/linux-audit/audit-kernel/issues/59

Changelog:
v2:
- re-order audit_log_exit() and audit_kill_trees()
- drop EOE reordering patch
- rebase on 4.18-rc1 (audit/next)

Richard Guy Briggs (6):
  audit: give a clue what CONFIG_CHANGE op was involved
  audit: add syscall information to CONFIG_CHANGE records
  audit: exclude user records from syscall context
  audit: hand taken context to audit_kill_trees for syscall logging
  audit: kill trees before logging syscall exit for exit/free
  audit: extend config_change mark/watch/tree rule changes

 kernel/audit.c          | 20 ++++++++++++++------
 kernel/audit.h          |  4 ++--
 kernel/audit_fsnotify.c |  4 ++--
 kernel/audit_tree.c     | 28 +++++++++++++++-------------
 kernel/audit_watch.c    |  8 +++++---
 kernel/auditfilter.c    |  2 +-
 kernel/auditsc.c        |  9 ++++-----
 7 files changed, 43 insertions(+), 32 deletions(-)

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1.8.3.1