Messages in this thread | | | Subject | Re: [malware-list] TALPA - a threat model? well sorta. | From | douglas.leeder@sophos ... | Date | Mon, 18 Aug 2008 11:25:41 +0100 |
| |
Helge Hafting <helge.hafting@aitel.hist.no> wrote on 2008-08-18 11:09:25:
> Scanning on open should be a last resort. Scan in advance when you can. > Of course, removable media cannot be scanned until it is inserted and > mounted, > that is obvious. The scanning can start as soon as the filesystem is > mounted though, > there is no reason to wait until users try to access something. > > A CD inserted into a CD-server may not necessarily be needed immediately, so > scanning in advance will help here too. The user inserting a CD in a home > computer may start to use stuff right away, or perhaps he spends > some time reading the docs before a complicated install. Sill room for some > scanning in advance, which also may end up with the nice effect of > caching the CD.
It might be useful to scan in advance, on mount, or scanner start. But that can be simulated using a user-space program, and kernel-based on-open blocking scans: Just have a background program open the files, and they will be scanned and cached. The background program could also do clever things like check if running on battery, check load level, keep hot-lists of files to scan/scan first.
All of which can be implemented on top of the Talpa interface already specified.
In practice scan on-open with blocking is fast enough for general usage, even using our existing hacky kernel module approach.
-- Douglas Leeder
Sophos Plc, The Pentagon, Abingdon Science Park, Abingdon, OX14 3YP, United Kingdom.
Company Reg No 2096520. VAT Reg No GB 348 3873 20.
| |