linux-kernel - Re: ntp audit spew.

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Message-ID: <20190923194901.GA2787@codemonkey.org.uk>
Date:   Mon, 23 Sep 2019 15:49:01 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Eric Paris <eparis@...hat.com>, linux-audit@...hat.com
Subject: Re: ntp audit spew.

On Mon, Sep 23, 2019 at 02:57:08PM -0400, Paul Moore wrote:
 > On Mon, Sep 23, 2019 at 12:58 PM Dave Jones <davej@...emonkey.org.uk> wrote:
 > > On Mon, Sep 23, 2019 at 12:14:14PM -0400, Paul Moore wrote:
 > >  > On Mon, Sep 23, 2019 at 11:50 AM Dave Jones <davej@...emonkey.org.uk> wrote:
 > >  > >
 > >  > > I have some hosts that are constantly spewing audit messages like so:
 > >  > >
 > >  > > [46897.591182] audit: type=1333 audit(1569250288.663:220): op=offset old=2543677901372 new=2980866217213
 > >  > > [46897.591184] audit: type=1333 audit(1569250288.663:221): op=freq old=-2443166611284 new=-2436281764244
 > >  > > [48850.604005] audit: type=1333 audit(1569252241.675:222): op=offset old=1850302393317 new=3190241577926
 > >  > > [48850.604008] audit: type=1333 audit(1569252241.675:223): op=freq old=-2436281764244 new=-2413071187316
 > >  > > [49926.567270] audit: type=1333 audit(1569253317.638:224): op=offset old=2453141035832 new=2372389610455
 > >  > > [49926.567273] audit: type=1333 audit(1569253317.638:225): op=freq old=-2413071187316 new=-2403561671476
 > >  > >
 > >  > > This gets emitted every time ntp makes an adjustment, which is apparently very frequent on some hosts.
 > >  > >
 > >  > >
 > >  > > Audit isn't even enabled on these machines.
 > >  > >
 > >  > > # auditctl -l
 > >  > > No rules
 > >  >
 > >  > What happens when you run 'auditctl -a never,task'?  That *should*
 > >  > silence those messages as the audit_ntp_log() function has the
 > >  > requisite audit_dummy_context() check.
 > >
 > > They still get emitted.
 > >
 > >  > FWIW, this is the distro
 > >  > default for many (most? all?) distros; for example, check
 > >  > /etc/audit/audit.rules on a stock Fedora system.
 > >
 > > As these machines aren't using audit, they aren't running auditd either.
 > > Essentially: nothing enables audit, but the kernel side continues to log
 > > ntp regardless (no other audit messages seem to do this).
 > 
 > What does your kernel command line look like?  Do you have "audit=1"
 > somewhere in there?

nope.

ro root=LABEL=/ biosdevname=0 net.ifnames=0 fsck.repair=yes systemd.gpt_auto=0 pcie_pme=nomsi ipv6.autoconf=0 erst_disable crashkernel=128M console=tty0 console=ttyS1,57600 intel_iommu=tboot_noforce

	Dave