linux-kernel - Re: ntp audit spew.

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Message-ID: <d5d92540ca5aab8916ac4d93f6b5677ab52d2e7d.camel@redhat.com>
Date:   Mon, 23 Sep 2019 15:49:52 -0400
From:   Eric Paris <eparis@...hat.com>
To:     Dave Jones <davej@...emonkey.org.uk>,
        Paul Moore <paul@...l-moore.com>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>, linux-audit@...hat.com
Subject: Re: ntp audit spew.

Is this the thing where systemd is listening on the multicast netlink
socket and causes everything to come out kmesg as well?

On Mon, 2019-09-23 at 15:49 -0400, Dave Jones wrote:
> 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
>