linux-kernel - Re: [PATCH] audit: fix endless wait in audit_log

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Date:	Wed, 18 Sep 2013 09:31:48 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Dan Duval <dan.duval@...cle.com>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Chuck Anderson <chuck.anderson@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] audit: fix endless wait in audit_log_start()

On Wed, Sep 18, 2013 at 01:48:17PM +0400, Konstantin Khlebnikov wrote:
> After commit 829199197a430dade2519d54f5545c4a094393b8 audit emiters will block
> forever if userspace daemon cannot handle backlog. After the timeout waiting
> loop turns into busy loop and runs until daemon dies or returns back to work.
> This is minimal patch for that bug.

Thanks Konstantin,

This patch is in my patchset...

> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Luiz Capitulino <lcapitulino@...hat.com>
> Cc: Richard Guy Briggs <rgb@...hat.com>
> Cc: Eric Paris <eparis@...hat.com>
> Cc: Chuck Anderson <chuck.anderson@...cle.com>
> Cc: Dan Duval <dan.duval@...cle.com>
> Cc: Dave Kleikamp <dave.kleikamp@...cle.com>
> ---
>  kernel/audit.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 91e53d0..7b0e23a 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1117,9 +1117,10 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
>  
>  			sleep_time = timeout_start + audit_backlog_wait_time -
>  					jiffies;
> -			if ((long)sleep_time > 0)
> +			if ((long)sleep_time > 0) {
>  				wait_for_auditd(sleep_time);
> -			continue;
> +				continue;
> +			}
>  		}
>  		if (audit_rate_check() && printk_ratelimit())
>  			printk(KERN_WARNING
> 

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer
Kernel Security
AMER ENG Base Operating Systems
Remote, Ottawa, Canada
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