linux-kernel - Re: [PATCH v10 1/2] fork: extend clone3() to support setting a PID

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Date:   Fri, 15 Nov 2019 10:34:20 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Andrei Vagin <avagin@...il.com>
Cc:     Adrian Reber <areber@...hat.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Pavel Emelyanov <ovzxemul@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        Radostin Stoyanov <rstoyanov1@...il.com>
Subject: Re: [PATCH v10 1/2] fork: extend clone3() to support setting a PID

On 11/14, Andrei Vagin wrote:
>
> On Thu, Nov 14, 2019 at 03:27:06PM +0100, Adrian Reber wrote:
> ...
> > diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h
> > index 1d500ed03c63..2e649cfa07f4 100644
> > --- a/include/uapi/linux/sched.h
> > +++ b/include/uapi/linux/sched.h
> ...
> > @@ -174,24 +186,51 @@ struct pid *alloc_pid(struct pid_namespace *ns)
> >  	pid->level = ns->level;
> >
> >  	for (i = ns->level; i >= 0; i--) {
> > -		int pid_min = 1;
> > +		int tid = 0;
> > +
> > +		if (set_tid_size) {
> > +			tid = set_tid[ns->level - i];
> > +			if (tid < 1 || tid >= pid_max)
> > +				return ERR_PTR(-EINVAL);
>
> do we need to release pids what have been allocated on previous levels?

Heh ;) it is really amazing that nobody noticed this! Thanks Andrei.

> nr = -EINVAL;

retval = -EINVAL;

> goto out_free;

Oleg.