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

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Date:	Sat, 19 Sep 2015 17:52:32 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Paul Moore <pmoore@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	sgrubb@...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, Paul Moore wrote:
> On Friday, September 18, 2015 03:52:43 AM Richard Guy Briggs 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.
> 
> Ungh, that's embarrassing; I really should have caught that in review.  Sigh.  
> At least it shouldn't cause anything to blow up, just a less than helpful 
> message.

Yup, just useless noise.

> I pulled the original patch from linux-audit#next just now, I'll re-add it 
> once we sort this out.

Ok...

> Comments below ...

Likewise...

> > 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);
> > +				audit_log_lost(s);
> 
> Granted 32 bytes should be big enough for the string, but I would feel better 
> if we used snprintf() here; make the change and I'll merge the patch with the 
> original and push it back to linux-audit#next.

Done...

> Normally I'm not a big fan of amending patches after they have been committed, 
> but in this case it is in the next branch (doing this for upstream or stable-X 
> is a big "no") and nothing sits on top of it.

That's the only reason I suggested it...

> >  				audit_pid = 0;
> >  				audit_sock = NULL;
> >  			} else {
> 
> paul moore

- 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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