linux-kernel - Re: [PATCHv1 5/8] cgroup: introduce cgroup namespaces

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Message-ID: <20141025031608.GA13250@mail.hallyn.com>
Date:	Sat, 25 Oct 2014 05:16:08 +0200
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Aditya Kali <adityakali@...gle.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Andy Lutomirski <luto@...capital.net>, cgroups@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCHv1 5/8] cgroup: introduce cgroup namespaces

Quoting Aditya Kali (adityakali@...gle.com):
> >> +void free_cgroup_ns(struct cgroup_namespace *ns)
> >> +{
> >> +     cgroup_put(ns->root_cgrp);
> >> +     put_user_ns(ns->user_ns);
> >
> > This is a problem on error patch in copy_cgroup_ns.  The
> > alloc_cgroup_ns() doesn't initialize these values, so if
> > you should fail in proc_alloc_inum() you'll show up here
> > with fandom values in ns->*.
> >
> 
> I don't see the codepath that leads to calling free_cgroup_ns() with
> uninitialized members. We don't call free_cgroup_ns() on the error
> path in copy_cgroup_ns().

Hm, yeah, I'm not seeing it now, sorry.
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