Another new ABI for fanotify

Some would say the other intended use case is malware-spreading utilities, it is better to "infect" executables which are often executed than those who lay dormant... and having a standard interface for viruses would greatly simplify their development.
Moreover, because it seems you should be able to use multiple independant virus checker, you can hook "under" or "over" a virus checker, to hide your virus from upper layers, or to add it once the file has been certified clean.