From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] ns: introduce getnspid syscall
Date: Wed, 18 Jun 2014 20:02:37 +0200
Message-ID: <20140618180237.GA22219@redhat.com>
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To: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Cc: Richard Weinberger <richard.weinberger-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Serge Hallyn <serge.hallyn-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
List-Id: containers.vger.kernel.org

On 06/17, Pavel Emelyanov wrote:
>
> On 06/17/2014 02:21 PM, Chen Hanxiao wrote:
> > +	case PIDTYPE_PID:
> > +		ret = task_pid_nr_ns(task, ns2);
>
> But this is not correct. If task doesn't live in ns2, but ns2
> just has the ns->level small enough, then the wrong pid value
> would be reported.

Confused... pid_nr_ns() checks upid->ns == ns and returns zero
otherwise?

Oleg.