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Is this something I ought to be worried about?
Searching for suspicious files and dirs, it may take a while... /usr/lib/jvm/.java-gcj.jinfo /lib/modules/2.6.15-29-386/volatile/.mounted
Although I'm not familiar with either file in your case, it's probably ok. chkrootkit checks several filesystems for hidden files/subdirectories (i.e. those preceded with a ".") and reports on what it discovers. This particular check is highly likely to produce false positives.
There are some steps you can perform to try to determine what the file is and where it came from. For example, I run CentOS 5 (rpm-based) -- here's a similar scenario from my box.
... Searching for suspicious files and dirs, it may take a while... /usr/lib/gtk-2.0/immodules/.relocation-tag /usr/lib/perl5/5.8.8/i386-linux-threa d-multi/.packlist ...
[root@fugu ~]# rpm -q -f /usr/lib/gtk-2.0/immodules/.relocation-tag gtk2-2.10.4-19.el5 [root@fugu ~]# rpm -q -f /usr/lib/perl5/5.8.8/i386-linux-thread-multi/.packlist perl-5.8.8-10.el5_0.2
I just used dpkg-query to check these files and the first is certainly legitimate. It belongs to a package called java-gcj-compat, though I've no idea what that actually does. I couldn't find any record for the .mounted file so I took a look at it. It's an empty file, obviously some kind of logical flag for the system. I don't see how an empty flag file can do any harm without a malicious program to use it, and no actual worms were detected, so I think I'll ignore it. Thanks for your help anyway.
Well, if anyone is interested, /lib/modules/2.6.15-29/volatile/.mounted is kosher too. It's created by an Ubuntu startup script called lrm-manager which turns proprietary drivers into kernel modules; the modules are created in a temporary filesystem mounted on /lib/modules/kernel_version/volatile, and this flag file is then created to show that the mount is complete. Panic over!