From: Paul Moore <paul@paul-moore.com>
To: Dave Jones <davej@codemonkey.org.uk>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Eric Paris <eparis@redhat.com>,
linux-audit@redhat.com
Subject: Re: ntp audit spew.
Date: Mon, 23 Sep 2019 12:14:14 -0400 [thread overview]
Message-ID: <CAHC9VhTyz7fd+iQaymVXUGFe3ZA5Z_WkJeY_snDYiZ9GP6gCOA@mail.gmail.com> (raw)
In-Reply-To: <20190923155041.GA14807@codemonkey.org.uk>
On Mon, Sep 23, 2019 at 11:50 AM Dave Jones <davej@codemonkey.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
[NOTE: added linux-audit to the CC line]
There is an audit mailing list, please CC it when you have audit
concerns/questions/etc.
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. FWIW, this is the distro
default for many (most? all?) distros; for example, check
/etc/audit/audit.rules on a stock Fedora system. A more selective
configuration could simply exclude the TIME_ADJNTPVAL record (type
1333) from the records that the kernel emits.
We could also add a audit_enabled check at the top of
audit_ntp_log()/__audit_ntp_log(), but I imagine some of that depends
on the various security requirements (they can be bizzare and I can't
say I'm up to date on all those - Steve Grubb should be able to
comment on that).
--
paul moore
www.paul-moore.com
next prev parent reply other threads:[~2019-09-23 16:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-23 15:50 ntp audit spew Dave Jones
2019-09-23 16:14 ` Paul Moore [this message]
2019-09-23 16:58 ` Dave Jones
2019-09-23 18:57 ` Paul Moore
2019-09-23 19:49 ` Dave Jones
2019-09-23 19:49 ` Eric Paris
2019-09-24 2:39 ` Paul Moore
2019-09-23 21:00 ` Richard Guy Briggs
2019-09-24 3:01 ` Paul Moore
2019-09-24 13:50 ` Richard Guy Briggs
2019-09-24 17:05 ` Paul Moore
2019-09-26 15:50 ` Paul Moore
2019-09-24 13:19 ` Steve Grubb
2019-09-24 17:01 ` Paul Moore
2019-10-31 16:39 ` [PATCH] audit: set context->dummy even when audit is off Chris Mason
2019-10-31 23:27 ` Paul Moore
2019-11-01 13:24 ` Chris Mason
2019-11-01 14:16 ` Steve Grubb
2019-11-01 15:55 ` Chris Mason
2019-11-05 0:15 ` Paul Moore
2019-11-05 0:39 ` Chris Mason
2019-11-05 0:45 ` Paul Moore
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