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I've never used anything other than Reiser3 with Linux. Partition resizing.

Which by it self is a sure win of Reiser3/4(*) and Ext2/3/4 versus JFS and XFS which can only increase size.
That's part of the reason I'm using it too.

Readable from within Windows via YaReG.

Another tool you might be interested by too :
Virtual Volumes.
- It's by the same guy who wrote Explore2fs
- It supports ReiserFS using the same tools (rtstools) as YaReG.
- It supports also RAID and LVM.
- Read/Write support.

And hoepfully, they'll end up adding WebDAV support so you can mount file systems under Windows.

(*): Now that development has been taken over by Edward Shishkin, shouldn't this get renamed as ShishkinFS ? :-P

I've never used anything other than Reiser3 with Linux. Might not be the most reliable or fast, but it has other advantages.

- Undeletion.
- Partition resizing.
- Readable from within Windows via YaReG.

the filesystems used in linux are free and open.

• explore2fs application that reads files from an ext2/ext3 partition, with LVM2 support
• ext2ifs old project by the maker of explorefs2, native reading support of ext2/ext3 in windows NT and up
• ext2fsd native reading support of ext2/ext3
• ext2ifs NON-opensource (maybe violating GPL ?) native read/write support for ext2 (and ext3, but the driver could fuck-up the journaling if partition wasn't unmounted clean in linux). Has a nice GUI to assign drive letters to partitions.
• rfstools and GUI Yareg application that reads files from an reiserfs partition.
• rfsd - native reading support for reiserfs

• It is possible to add access to linux partition in windows
• Even write access is possible and currently the non-open source ext2ifs provides a solution that can be read/written by both OS and which is a little better than FAT32
• although Windows has no propper device mapper but only Dynamic Drives, LVM2 data can still be accessed (although not with a native driver).
• None of this numerous attempt is done by Microsoft. This show how much they want to play nice with the others

If you know of a Windows ext3 or Raiser driver, then please tell me. Basically, nothing has changed.

Well, instead of moaning about the non-existence of something that you've clearly not checked for, you could always try this site, followed by this one, this one, this one, this one, this one, and this one, plus many others.

Sample of an opensource ext2fs reader for Windows: http://uranus.it.swin.edu.au/~jn/linux/explore2fs. htm
Sample of an opensource reiserfs reader for Windows: http://yareg.akucom.de/index.html

Don't know if they can write at all, but, I'm sure if you googled around a little more you'd find one that did. The point is, it's definitely out there and the code is even available for a lot if not all of them.

That said, the real idea is generally to infect via things like Samba shares. I don't think the virus relies on the user to be dual booting since probably in the majority of the setups you'll be running one or the other all the time not rebooting frequently. A lot of times, such as mine, you'll have windows systems behind linux systems acting as firewalls/routers and servers, and I'm thinking that's more the kind of thing they're really interested in.

Oh, and offtopic just a smidge, but, on a directly related note, there is a swap partition driver for Windows, which you can find info on here: http://www.acc.umu.se/~bosse/ It's offtopic in that it's useless to write to a linux swap partition to infect linux since linux treats it as garbage on every bootup unless I'm mistaken. However, one security vulnerability in windows supposedly has to do with the swap file, hence an option to wipe the swap on reboot. Unfortunately, the wipe takes a very long time. Since swap is considered garbage on every boot (including by this driver) it will be seen as a blank filesystem each time. In other words, it can be handy to set this driver up correctly (be careful to get it right though so you don't damage anything else) and then move the Windows swap file onto it. This way you have a partition dedicated to the swap file (which also means you no longer have all that harddrive space just wasted for nothing) and it starts over from scratch on every reboot too.

Not Reiser4, but there are some tools to access Reiser3 from Windows: RFSTool, and YAReG, a graphical frontend for RFSTool.