Re: TALPA - a threat model? well sorta.

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To: Eric Paris <eparis@...>

Cc: Arjan van de Ven <arjan@...>, <linux-kernel@...>, <malware-list@...>, <andi@...>, <riel@...>, <greg@...>, <tytso@...>, <viro@...>, <alan@...>, <peterz@...>, <hch@...>

Subject: Re: TALPA - a threat model? well sorta.

Date: Friday, August 15, 2008 - 6:07 am

It seems to me that this "scan on file open" business is the
wrong way to do things - because it reduces performance.

If you scan on file open, then your security sw is too late and
getting in the way.

It is better to scan in advance. Most machines has lots of idle time.
Use that time to scan in advance, and mark the files as "clean".

A "clean" file can be opened without further checking anytime - giving
normal high performance.  A file that gets written to becomes "dirty"
until checked again. Some mechanism for making a clean copy of a
clean file might help avoid excessive "dirtying".

"Scan on open" might still be useful for cases when the system
haven't kept up with writing, but please don't aim to have
this be the _primary_ mode of scanning. A file server
where most of the stuff is pre-scanned will likely perform much better
than  one scanning everything on open.

Helge Hafting
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Messages in current thread:

TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 12:36 pm)

Re: TALPA - a threat model? well sorta., 7v5w7go9ub0o, (Wed Aug 13, 8:14 pm)

Re: TALPA - a threat model? well sorta., 7v5w7go9ub0o, (Wed Aug 13, 10:25 pm)

Re: TALPA - a threat model? well sorta., Andi Kleen, (Wed Aug 13, 2:17 pm)

Re: TALPA - a threat model? well sorta., Mihai , (Wed Aug 13, 8:18 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Thu Aug 14, 7:58 am)

Re: [malware-list] TALPA - a threat model? well sorta., Mihai , (Thu Aug 14, 8:34 am)

Re: TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 2:40 pm)

Re: TALPA - a threat model? well sorta., H. Peter Anvin, (Wed Aug 13, 2:21 pm)

Re: TALPA - a threat model? well sorta., Arjan van de Ven, (Wed Aug 13, 2:24 pm)

Re: TALPA - a threat model? well sorta., Arjan van de Ven, (Wed Aug 13, 1:39 pm)

Re: TALPA - a threat model? well sorta., Pavel Machek, (Fri Aug 15, 12:06 pm)

Re: TALPA - a threat model? well sorta., , (Mon Aug 18, 8:21 am)

Re: TALPA - a threat model? well sorta., Pavel Machek, (Mon Aug 18, 9:30 am)

Re: TALPA - a threat model? well sorta., , (Mon Aug 18, 8:03 pm)

Re: TALPA - a threat model? well sorta., , (Thu Aug 14, 9:31 pm)

Re: TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 2:57 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Thu Aug 14, 5:46 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Thu Aug 14, 9:37 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Arjan van de Ven, (Thu Aug 14, 9:46 am)

Re: TALPA - a threat model? well sorta., Arjan van de Ven, (Wed Aug 13, 5:39 pm)

Re: TALPA - a threat model? well sorta., Eric Paris, (Thu Aug 14, 10:12 am)

Re: TALPA - a threat model? well sorta., Helge Hafting, (Fri Aug 15, 6:07 am)

Re: TALPA - a threat model? well sorta., , (Fri Aug 15, 6:44 am)

Re: TALPA - a threat model? well sorta., Peter Zijlstra, (Fri Aug 15, 6:37 am)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Fri Aug 15, 9:10 am)

Re: [malware-list] TALPA - a threat model? well sorta., Helge Hafting, (Mon Aug 18, 6:02 am)

RE: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 12:25 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Fri Aug 15, 12:30 pm)

RE: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 1:33 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Fri Aug 15, 1:40 pm)

RE: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 1:47 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Fri Aug 15, 2:17 pm)

RE: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 4:08 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 2:06 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Fri Aug 15, 4:17 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 4:05 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 9:18 am)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Fri Aug 15, 1:04 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Fri Aug 15, 2:09 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Helge Hafting, (Mon Aug 18, 6:09 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Mon Aug 18, 6:25 am)

Re: [malware-list] TALPA - a threat model? well sorta., Peter Zijlstra, (Mon Aug 18, 6:14 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Mon Aug 18, 6:24 am)

Re: TALPA - a threat model? well sorta., Arjan van de Ven, (Thu Aug 14, 11:57 am)

Re: TALPA - a threat model? well sorta., Theodore Tso, (Wed Aug 13, 2:15 pm)

Re: TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 3:02 pm)

Re: TALPA - a threat model? well sorta., Theodore Tso, (Wed Aug 13, 3:29 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Thu Aug 14, 5:30 am)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 9:24 am)

Re: [malware-list] TALPA - a threat model? well sorta., Eric Paris, (Thu Aug 14, 9:48 am)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 11:50 am)

Re: [malware-list] TALPA - a threat model? well sorta., Pavel Machek, (Fri Aug 15, 10:37 am)

Re: [malware-list] TALPA - a threat model? well sorta., Eric Paris, (Thu Aug 14, 1:29 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 3:17 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Christoph Hellwig, (Thu Aug 14, 3:34 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 3:41 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Thu Aug 14, 9:44 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 10:04 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Alan Cox, (Fri Aug 15, 4:51 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 12:48 am)

Re: [malware-list] TALPA - a threat model? well sorta., Arjan van de Ven, (Thu Aug 14, 11:41 pm)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 1:05 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 1:36 am)

Re: [malware-list] TALPA - a threat model? well sorta., Johannes Weiner, (Fri Aug 15, 1:12 am)

Re: [malware-list] TALPA - a threat model? well sorta., , (Fri Aug 15, 1:28 am)

Re: [malware-list] TALPA - a threat model? well sorta., Christoph Hellwig, (Thu Aug 14, 4:20 pm)

Re: [malware-list] TALPA - a threat model? well sorta., J. Bruce Fields, (Thu Aug 14, 5:21 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Theodore Tso, (Thu Aug 14, 7:34 pm)

Re: [malware-list] TALPA - a threat model? well sorta., J. Bruce Fields, (Tue Aug 19, 5:43 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Eric Paris, (Thu Aug 14, 3:20 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Thu Aug 14, 8:03 am)

RE: [malware-list] TALPA - a threat model? well sorta., , (Thu Aug 14, 8:27 am)

Re: [malware-list] TALPA - a threat model? well sorta., Pavel Machek, (Fri Aug 15, 10:31 am)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Wed Aug 13, 5:15 pm)

Re: TALPA - a threat model? well sorta., Arjan van de Ven, (Wed Aug 13, 2:21 pm)

Re: TALPA - a threat model? well sorta., , (Thu Aug 14, 5:18 am)

Re: TALPA - a threat model? well sorta., Greg KH, (Wed Aug 13, 12:57 pm)

Re: TALPA - a threat model? well sorta., Alan Cox, (Wed Aug 13, 12:24 pm)

Re: TALPA - a threat model? well sorta., Arnd Bergmann, (Thu Aug 14, 9:00 am)

Re: TALPA - a threat model? well sorta., Christoph Hellwig, (Wed Aug 13, 1:07 pm)

Re: TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 12:47 pm)

Re: TALPA - a threat model? well sorta., Alan Cox, (Wed Aug 13, 12:37 pm)

Re: TALPA - a threat model? well sorta., Eric Paris, (Wed Aug 13, 1:00 pm)

Re: TALPA - a threat model? well sorta., Alan Cox, (Wed Aug 13, 3:59 pm)

RE: [malware-list] TALPA - a threat model? well sorta., Press, Jonathan, (Wed Aug 13, 5:24 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Rik van Riel, (Wed Aug 13, 5:35 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Jan Harkes, (Fri Aug 15, 4:16 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Arjan van de Ven, (Fri Aug 15, 6:05 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Eric Paris, (Sun Aug 17, 7:19 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Alan Cox, (Mon Aug 18, 11:33 am)

Re: [malware-list] TALPA - a threat model? well sorta., Rik van Riel, (Mon Aug 18, 12:43 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Arjan van de Ven, (Sun Aug 17, 7:26 pm)

Re: [malware-list] TALPA - a threat model? well sorta., David Collier-Brown, (Sun Aug 17, 5:11 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Alan Cox, (Wed Aug 13, 5:23 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Eric Paris, (Thu Aug 14, 11:25 pm)

Re: [malware-list] TALPA - a threat model? well sorta., Alan Cox, (Wed Aug 13, 5:13 pm)

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