linux-kernel - Re: [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces

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Message-ID: <20160726183224.GN24913@odin.tremily.us>
Date:	Tue, 26 Jul 2016 11:32:25 -0700
From:	"W. Trevor King" <wking@...mily.us>
To:	Andrew Vagin <avagin@...tuozzo.com>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"criu@...nvz.org" <criu@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 0/5 RFC] Add an interface to discover relationships
 between namespaces

On Tue, Jul 26, 2016 at 11:25:24AM -0700, Andrew Vagin wrote:
> Sure. If a process wants to compare two namespaces, it needs to get file
> descriptors for them (open /proc/PID/ns/XXX, use new ioctl-s, find a
> process which has them),
> and then it calls kcmp(pid1, pid2, KCMP_NSFD, ns_fd1, ns_fd2)

If you use the new ioctl-s to get ns_fd2, do you walk your local /proc
to find pid2?

Cheers,
Trevor

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