linux-kernel - [PATCH] audit: wait_for_auditd() should use TASK

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Message-ID: <20130524173925.GA17177@redhat.com>
Date:	Fri, 24 May 2013 19:39:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Guy Streeter <streeter@...hat.com>, Eric Paris <eparis@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE

audit_log_start() does wait_for_auditd() in a loop until
audit_backlog_wait_time passes or audit_skb_queue has a room.

If signal_pending() is true this becomes a busy-wait loop,
schedule() in TASK_INTERRUPTIBLE won't block.

Reported-by: Guy Streeter <streeter@...hat.com>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>

--- x/kernel/audit.c
+++ x/kernel/audit.c
@@ -1056,7 +1056,7 @@ static inline void audit_get_stamp(struc
 static void wait_for_auditd(unsigned long sleep_time)
 {
 	DECLARE_WAITQUEUE(wait, current);
-	set_current_state(TASK_INTERRUPTIBLE);
+	set_current_state(TASK_UNINTERRUPTIBLE);
 	add_wait_queue(&audit_backlog_wait, &wait);
 
 	if (audit_backlog_limit &&

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