On Wednesday, December 13, 2017 7:16:47 PM EST Kees Cook wrote:
> On Wed, Dec 13, 2017 at 3:58 PM, Steve Grubb <sgrubb@redhat.com> wrote:
> > Hello,
> >
> > Over the last month, the amount of seccomp events in audit logs is
> > sky-rocketing. I have over a million events in the last 2 days. Most of
> > this is generated by firefox and qt webkit.
> >
> > I am wondering if the audit package should ship a file for
> >
> > /usr/lib/sysctl.d/60-auditd.conf
> >
> > wherein it has
> >
> > kernel.seccomp.actions_logged = kill_process kill_thread errno
> >
> > Also, has anyone verified this sysctl is filtering audit events? Even with
> > the above, I have over a million events on a 4.14.3 kernel. Firefox alone
> > is generating over 50,000 events per hour.
>
> I don't think you'd want to log errno -- AIUI, that's used regularly
> by a lot of seccomp policy.
I'm not seeing any reporting errno. The ones reporting trap are coming in over 50,000 per hour. I don't think the filter is working.
[root@x2 ~]# cat /proc/sys/kernel/seccomp/actions_logged
kill_process kill_thread errno
[root@x2 ~]# date
Wed Dec 13 19:24:40 EST 2017
[root@x2 ~]# ausearch --start 19:24:40 -m seccomp --raw | aureport --event --summary -i
Event Summary Report
======================
total type
======================
170 SECCOMP
In the time it took to type the command 170 seccomp events were recorded from firefox.
[root@x2 ~]# ausearch --start 19:24:40 -m seccomp --just-one -i
----
node=x2 type=SECCOMP msg=audit(12/13/2017 19:24:56.454:199666) : auid=sgrubb uid=sgrubb gid=sgrubb ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=3394 comm=Web Content exe=/usr/lib64/firefox/firefox sig=SIG0 arch=x86_64 syscall=stat compat=0 ip=0x7f909c828635 code=trap
^^ trap. With the sheer amount of events being recorded, I think it's necessary to add a sysctl file to systems to suppress the logging. Especially when you consider that systemd-journal also gratuitously grabs audit logs and sends them to rsyslog.
-Steve