Re: [patch 2/6] posix-cpu-timers: Fix permission check regression

[Thomas Gleixner]

On Thu, 5 Sep 2019, Frederic Weisbecker wrote:
> On Thu, Sep 05, 2019 at 02:03:41PM +0200, Thomas Gleixner wrote:
> > +	if (gettime) {
> > +		/*
> > +		 * For clock_gettime() the task does not need to be the
> > +		 * actual group leader. tsk->sighand gives access to the
> > +		 * group's clock.
> > +		 */
> 
> I'm a bit confused with the explanation. Why is it fine to do so with clock
> and not with timer? tsk->sighand gives access to the group's timer as
> well.

Timer stores the target task and that's the group leader for process wide
while clock read is just momentary. Lemme rephrase that.

Thanks,

	tglx