Bugtraq mailing list archives
Re: Changes to the filesystem while find is running - comments?
From: psz () maths usyd edu au (Paul Szabo)
Date: Wed, 24 Nov 2004 05:59:38 +1100 (EST)
James,
Hmm... It would not descend into just-now-changed automounts (and it may not be able to get back out of them), but it should be able to traverse reasonably long-lived mounts.The problem is though that when you chdir() into an automount mount point, automount aill automatically mount it for you. Hence if an automount filesystem wasn't already mounted, if you chdir() into it it immediately becomes a "just-now-changed" mount point. That's the essensce of the problem I am trying to solve.
I think find should never cause an automount to "trigger" and cause it to be mounted. It is OK to traverse if it was mounted to start with; is surely not OK to traverse if it wasn't already mounted. Maybe your problem is sidestepped by this principle? [Right now cannot think of examples where find causing automounts to trigger would be an obvious security or performance issue.] To prevent find from causing an automount to trigger, maybe you could somehow detect the presence of the mount point, check its status, and (after a warning) not descend if it wasn't mounted. [I use the Debian autofs package; this uses a normally empty directory, which is populated with mounted directories when in use. Are we talking about the short time between the mkdir of the mountpoint and the mount?] Cheers, Paul Szabo - psz () maths usyd edu au http://www.maths.usyd.edu.au:8000/u/psz/ School of Mathematics and Statistics University of Sydney 2006 Australia
Current thread:
- Re: Changes to the filesystem while find is running - comments?, (continued)
- Re: Changes to the filesystem while find is running - comments? Martin Buchholz (Nov 23)
- Re: Changes to the filesystem while find is running - comments? James Youngman (Nov 23)
- Re: Changes to the filesystem while find is running - comments? Martin Buchholz (Nov 23)
- Re: Changes to the filesystem while find is running - comments? devnull (Nov 24)
- Re: Changes to the filesystem while find is running - comments? Casper . Dik (Nov 24)
- Re: Changes to the filesystem while find is running - comments? Martin Buchholz (Nov 24)
- Re: Changes to the filesystem while find is running - comments? Casper . Dik (Nov 24)
- Re: Changes to the filesystem while find is running - comments? James Youngman (Nov 25)
- Re: Changes to the filesystem while find is running - comments? James Youngman (Nov 23)
- Re: Changes to the filesystem while find is running - comments? Martin Buchholz (Nov 23)
- Re: Changes to the filesystem while find is running - comments? James Youngman (Nov 23)