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Date: Tue, 07 Jul 2009 16:57:11 -0400
From: Eric Paris <eparis@...hat.com>
To: Valdis.Kletnieks@...edu
Cc: linux-kernel@...r.kernel.org, malware-list@...sg.printk.net
Subject: Re: fanotify: the fscking all notification system
On Tue, 2009-07-07 at 15:41 -0400, Valdis.Kletnieks@...edu wrote:
> On Tue, 30 Jun 2009 13:26:37 EDT, Eric Paris said:
> > 1) the fd the fanotify listener gets is O_RDONLY. I think I'll add an
> > "f_flags" option which if 0 defaults to O_RDONLY|O_LARGEFILE like we
> > have today but which you could use to indicate O_RDWR or O_WRONLY. We
> > currently give O_RDONLY since you can't request O_WR* on files/libraries
> > mapped exec, so this won't work for executables.....
>
> Having only O_RDONLY is a show-stopper, because then we can't replace the file
> contents before continuing. For many places, the executables and shared
> libraries aren't the problem, so "You can't HSM an executable" as a
> semi-permanent restriction isn't too bad.
My current devel work allows you to set to open flags. So an HSM would
use O_RDWR|O_LARGEFILE whereas a file scanner/indexer which cares about
executables/libraries would use O_RDONLY|O_LARGEFILE.
> > 2) Right now you have 5 seconds to answer an fanotify permissions
> > request, if you don't get it in 5 seconds you are done and the original
> > process gets an allow. But I have a half finished patch which would
> > allow you to delay them infinitely. As long as you keep them delayed
> > you can modify the file they are about to access however you like.
>
> That would work fine.
I've added the ability to delay indefinitely. Maybe your tape
robot/intern is slow/busy. I'll point you to code when I want you to
see it :)
> Yes, it's sounding like it. If that's in mainstream, then I can deploy an HSM
> without needing kernel hackery like most do currently.
I'm trying to be useful!
-Eric
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