linux-kernel - Re: [PATCH] fixup! audit: try harder to send to auditd upon netlink failure

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Date:	Fri, 18 Sep 2015 06:02:17 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Steve Grubb <sgrubb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	pmoore@...hat.com, eparis@...hat.com, v.rathor@...il.com,
	ctcard@...mail.com
Subject: Re: [PATCH] fixup! audit: try harder to send to auditd upon netlink
 failure

On 15/09/18, Steve Grubb wrote:
> On Fri, 18 Sep 2015 03:52:43 -0400
> Richard Guy Briggs <rgb@...hat.com> wrote:
> 
> > A bug was introduced by "audit: try harder to send to auditd upon
> > netlink failure", caused by incomplete code and a function that
> > expects a string and does not accept a format plus arguments.  Create
> > a temporary string variable to assemble the output text.  It could be
> > merged as a fixup if it is not yet upstream.
> > 
> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > ---
> >  kernel/audit.c |    5 ++++-
> >  1 files changed, 4 insertions(+), 1 deletions(-)
> > 
> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index 18cdfe2..60913e6 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> > @@ -420,7 +420,10 @@ restart:
> >  		if (audit_pid) {
> >  			if (err == -ECONNREFUSED || err == -EPERM
> >  			    || ++attempts >= AUDITD_RETRIES) {
> > -				audit_log_lost("audit_pid=%d reset");
> > +				char s[32];
> > +
> > +				sprintf(s, "audit_pid=%d reset",
> > audit_pid);
> 
> We normally use name=value for everything important. Reset by itself
> will get dropped by auparse. action=reset (or something similar) would
> be better.

This is sent to the system log when we can't queue it to audit, so audit
never sees this message.  None of the other audit_log_lost messages are
formatted in the audit style.

> -Steve
> 
> > +				audit_log_lost(s);
> >  				audit_pid = 0;
> >  				audit_sock = NULL;
> >  			} else {
> 

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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