Well yes I am sure about the research I did :-) However, to your point, I didnt actually consider that and of course now clearly makes the most sense. Thanks! On Wed, Mar 22, 2017 at 9:57 AM, Yedidyah Bar David <didi@redhat.com> wrote:
On Wed, Mar 22, 2017 at 3:43 PM, Charles Kozler <ckozleriii@gmail.com> wrote:
Thanks for the feedback!
From my research though it seems like it would take some effort to start a process and not register it in /proc or at least, it would be by intention to do so for that desired affect.
Are you sure about that?
What if the process is simply very short-lived? Wouldn't something like OSSEC wrongly count it as "hiding" simply because it died in the middle of being investigated? E.g. vdsm runs many times instances of 'dd' to check that some file is readable (or writable), IIRC.
I guess my ask here would be why would ovirt do that? Is there a relative performance gain? What processes inside ovirt would do such a thing?
Appreciate the help
On Wed, Mar 22, 2017 at 3:32 AM, Yedidyah Bar David <didi@redhat.com> wrote:
On Tue, Mar 21, 2017 at 7:54 PM, Charles Kozler <ckozleriii@gmail.com> wrote:
Unfortunately by the time I am able to SSH to the server and start looking around, that PID is no where to be found
Even if you do this immediately when OSSEC finishes? Do you get from it only a single pid?
So it seems something winds up in ovirt, runs, doesnt register in
(I think even threads register themself in /proc),
Now did some tests. Seems like they do, but are only "visible" if you access them directly, not if you e.g. 'ls -l /proc'.
and then dies off
Any ideas?
No idea about your specific issue. Based on your above question, did
/proc this:
# for pid in $(seq 32768); do if kill -0 $pid 2>/dev/null && ! ls -1 /proc | grep -qw $pid; then ps -e -T | grep -w $pid | awk '{print $1}'; fi; done | sort -u | while read ppid; do echo number of threads: $(ps -e -T | grep -w $ppid | wc -l) ps $ppid: $(ps -h -p $ppid); done number of threads: 5 ps 1149: 1149 ? Ssl 0:23 /usr/bin/python -Es /usr/sbin/tuned -l -P number of threads: 3 ps 1151: 1151 ? Ssl 0:55 /usr/sbin/rsyslogd -n number of threads: 2 ps 1155: 1155 ? Ssl 0:00 /usr/bin/ruby /usr/bin/fluentd -c /etc/fluentd/fluent.conf number of threads: 12 ps 1156: 1156 ? Ssl 4:49 /usr/sbin/collectd number of threads: 16 ps 1205: 1205 ? Ssl 0:08 /usr/sbin/libvirtd
number of threads: 6 ps 1426: 1426 ? Sl 23:57 /usr/bin/ruby /usr/bin/fluentd -c /etc/fluentd/fluent.conf number of threads: 32 ps 3171: 3171 ? S<sl 6:48 /usr/bin/python2 /usr/share/vdsm/vdsmd number of threads: 6 ps 3173: 3173 ? Ssl 8:48 python /usr/sbin/momd -c /etc/vdsm/mom.conf number of threads: 7 ps 575: 575 ? SLl 0:14 /sbin/multipathd number of threads: 3 ps 667: 667 ? SLsl 0:09 /usr/sbin/dmeventd -f number of threads: 2 ps 706: 706 ? S<sl 0:00 /sbin/auditd -n number of threads: 6 ps 730: 730 ? Ssl 0:00 /usr/lib/polkit-1/polkitd --no-debug number of threads: 3 ps 735: 735 ? Ssl 0:31 /usr/bin/python /usr/bin/ovirt-imageio-daemon number of threads: 4 ps 741: 741 ? S<sl 0:00 /usr/bin/python2 /usr/share/vdsm/supervdsmd --sockfile /var/run/vdsm/svdsm.sock number of threads: 2 ps 743: 743 ? Ssl 0:00 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation number of threads: 6 ps 759: 759 ? Ssl 0:00 /usr/sbin/gssproxy -D number of threads: 5 ps 790: 790 ? SLsl 0:09 /usr/sbin/sanlock daemon
(There are probably more efficient ways to do this, nvm).
On Tue, Mar 21, 2017 at 3:10 AM, Yedidyah Bar David <didi@redhat.com> wrote:
On Mon, Mar 20, 2017 at 5:59 PM, Charles Kozler <
ckozleriii@gmail.com>
wrote:
Hi -
I am wondering why OSSEC would be reporting hidden processes on my ovirt nodes? I run OSSEC across the infrastructure and multiple ovirt clusters have assorted nodes that will report a process is running but does not have an entry in /proc and thus "possible rootkit" alert is fired
I am well aware that I do not have rootkits on these systems but am wondering what exactly inside ovirt is causing this to trigger? Or any ideas? Below is sample alert. All my google-fu turns up is that a process would have to **try** to hide itself from /proc, so curious what
--listen this
is inside ovirt. Thanks!
-------------
OSSEC HIDS Notification. 2017 Mar 20 11:54:47
Received From: (ovirtnode2.mydomain.com2) any->rootcheck Rule: 510 fired (level 7) -> "Host-based anomaly detection event (rootcheck)." Portion of the log(s):
Process '24574' hidden from /proc. Possible kernel level rootkit.
What do you get from:
ps -eLf | grep -w 24574
Thanks, -- Didi
-- Didi
-- Didi