linux-kernel - Re: [PATCH 2/2] containers: implement namespace tracking subsystem (v3)

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Date:	Tue, 26 Jun 2007 14:58:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	menage@...gle.com, dev@...ru, xemul@...ru, vatsa@...ibm.com,
	ebiederm@...ssion.com, haveblue@...ibm.com,
	svaidy@...ux.vnet.ibm.com, balbir@...ibm.com, pj@....com,
	cpw@....com, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	mbligh@...gle.com, rohitseth@...gle.com, devel@...nvz.org
Subject: Re: [PATCH 2/2] containers: implement namespace tracking subsystem
 (v3)

On Wed, 13 Jun 2007 18:01:25 -0500
"Serge E. Hallyn" <serue@...ibm.com> wrote:

> @@ -177,6 +184,15 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
>  	if (IS_ERR(*new_nsp)) {
>  		err = PTR_ERR(*new_nsp);
>  		put_nsproxy(old_ns);
> +		goto out;
> +	}
> +
> +	err = ns_container_clone(current);
> +	if (err) {
> +		put_nsproxy(*new_nsp);
> +		put_nsproxy(old_ns);
>  	}
> +
> +out:
>  	return err;
>  }

I had to fix a reject here: the put_nsproxy(old_ns) has disappeared from
this code.

end result:

int unshare_nsproxy_namespaces(unsigned long unshare_flags,
		struct nsproxy **new_nsp, struct fs_struct *new_fs)
{
	int err = 0;

	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
			       CLONE_NEWUSER)))
		return 0;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	*new_nsp = create_new_namespaces(unshare_flags, current,
				new_fs ? new_fs : current->fs);
	if (IS_ERR(*new_nsp))
		err = PTR_ERR(*new_nsp);
		goto out;
	}

	err = ns_container_clone(current);
	if (err)
		put_nsproxy(*new_nsp);

out:
	return err;
}

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