Re: [PATCH 1/1] Fanotify: Introduce a permissive mode

> So, there is some utility to having the application stopped so that the > daemon can do its checks but then throw away the answer so that more of > the policy can be verified. > >> *if* at all this method is acceptable overriding access decision should >> probably be accompanied with pr_warn_ratelimited and a big warning >> for fanotify_init with FAN_CLASS_{,PRE_}CONTENT priority. > > I was hoping the audit event was a big enough warning. But something for > dmesg/syslog is easy to add. No warning is big enough if the change breaks existing apps behavior. One of the major flaws in your suggestion is that it changes the behavior globally. I think what you want for the debugging use case is to introduce a new fanotify_init() flag FAN_PERMISSIVE. Your daemon could set the new flag to opt-in for the new behavior, which may depend on kernel parameter, or even on sysfs knob if you like.