linux-kernel - Re: [PATCH] ns: introduce getnspid syscall

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Message-ID: <20140618180237.GA22219@redhat.com>
Date:	Wed, 18 Jun 2014 20:02:37 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Chen Hanxiao <chenhanxiao@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Vasiliy Kulikov <segooon@...il.com>,
	Gotou Yasunori <y-goto@...fujitsu.com>
Subject: Re: [PATCH] ns: introduce getnspid syscall

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.

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