linux-kernel - Re: [RFC PATCH 1/7] audit: don't needlessly reset valid wait time

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Message-ID: <20151105031347.GD12430@madcap2.tricolour.ca>
Date:	Wed, 4 Nov 2015 22:13:47 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Paul Moore <paul@...l-moore.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	v.rathor@...il.com
Subject: Re: [RFC PATCH 1/7] audit: don't needlessly reset valid wait time

On 15/11/04, Paul Moore wrote:
> On Thursday, October 22, 2015 02:53:14 PM Richard Guy Briggs wrote:
> > After auditd has recovered from an overflowed queue, the first process
> > that doesn't use reserves to make it through the queue checks should
> > reset the audit backlog wait time to the configured value.  After that,
> > there is no need to keep resetting it.
> > 
> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > ---
> >  kernel/audit.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index a72ad37..daefd81 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> > @@ -1403,7 +1403,7 @@ struct audit_buffer *audit_log_start(struct
> > audit_context *ctx, gfp_t gfp_mask, return NULL;
> >  	}
> > 
> > -	if (!reserve)
> > +	if (!reserve && !audit_backlog_wait_time)
> >  		audit_backlog_wait_time = audit_backlog_wait_time_master;
> > 
> >  	ab = audit_buffer_alloc(ctx, gfp_mask, type);
> 
> This looks fine to me, I'm going to add it to audit#next-queue.
> 
> Also, can you think of a good reason why "audit_backlog_wait_overflow" exists?  
> I'm going to replace it with the simple "audit_backlog_wait_time = 0;" unless 
> you can think of a solid reason not to do so.  It seems much more obvious and 
> readable to me.

That goes back to ac4cec44, DWMW, July 2005.  Best answer I can come up
with is that it labels magic values and puts them up front at the top of
the file.  I'd suggest instead replacing it with a macro.  I don't have
an significant objection to just assigning zero where you suggest.

> 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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