[PATCH] audit: we don't need to __set_current_state(TASK_RUNNING)
Paul Moore
pmoore at redhat.com
Wed Apr 6 17:41:33 UTC 2016
On Wednesday, April 06, 2016 12:56:24 PM Richard Guy Briggs wrote:
> On 16/04/05, Paul Moore wrote:
> > From: Paul Moore <paul at paul-moore.com>
> >
> > Remove the calls to __set_current_state() to mark the task as running
> > and do some related cleanup in wait_for_auditd() to limit the amount
> > of work we do when we aren't going to reschedule the current task.
>
> Wow, the logic of this goes back to 9ad9ad38 (2005-06-22, AUDIT: Wait
> for backlog to clear when generating messages.)
Yeah, I didn't think much of it until Jiri submitted that last patch and
figured I should check how we were doing handling the rescheduling in the rest
of the code. I think it stayed the way it was for so long because technically
it wasn't hurting anything.
> > Signed-off-by: Paul Moore <paul at paul-moore.com>
>
> These changes look good to me.
>
> > ---
> >
> > kernel/audit.c | 12 +++++-------
> > 1 file changed, 5 insertions(+), 7 deletions(-)
> >
> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index 3a3e5de..f52fbef 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> >
> > @@ -430,7 +430,6 @@ restart:
> > attempts, audit_pid);
> >
> > set_current_state(TASK_INTERRUPTIBLE);
> > schedule();
> >
> > - __set_current_state(TASK_RUNNING);
> >
> > goto restart;
> >
> > }
> >
> > }
> >
> > @@ -1324,15 +1323,14 @@ static inline void audit_get_stamp(struct
> > audit_context *ctx,>
> > static long wait_for_auditd(long sleep_time)
> > {
> >
> > DECLARE_WAITQUEUE(wait, current);
> >
> > - set_current_state(TASK_UNINTERRUPTIBLE);
> > - add_wait_queue_exclusive(&audit_backlog_wait, &wait);
> >
> > if (audit_backlog_limit &&
> >
> > - skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
> > + skb_queue_len(&audit_skb_queue) > audit_backlog_limit) {
> > + add_wait_queue_exclusive(&audit_backlog_wait, &wait);
> > + set_current_state(TASK_UNINTERRUPTIBLE);
> >
> > sleep_time = schedule_timeout(sleep_time);
> >
> > -
> > - __set_current_state(TASK_RUNNING);
> > - remove_wait_queue(&audit_backlog_wait, &wait);
> > + remove_wait_queue(&audit_backlog_wait, &wait);
> > + }
> >
> > return sleep_time;
> >
> > }
>
> - RGB
>
> --
> Richard Guy Briggs <rbriggs at redhat.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
--
paul moore
security @ redhat
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