linux-kernel - Re: [PATCH 2/6] pidns: Call pid_ns_prepare_proc from create_pid

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Message-ID: <20100620181956.GA3258@redhat.com>
Date:	Sun, 20 Jun 2010 20:19:56 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Louis Rilling <louis.rilling@...labs.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Linux Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org, Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [PATCH 2/6] pidns: Call pid_ns_prepare_proc from
	create_pid_namespace

On 06/20, Eric W. Biederman wrote:
>
> Reorganize proc_get_sb so it can be called before the struct pid
> of the first process is allocated.

This is what

	[PATCH 1/4] procfs: proc_get_sb: consolidate/cleanup root_inode->pid logic
	[PATCH 2/4] procfs: kill the global proc_mnt variable

do. But,

> @@ -96,6 +97,9 @@ static struct pid_namespace *create_pid_namespace(struct pid_namespace *parent_p
>  	for (i = 1; i < PIDMAP_ENTRIES; i++)
>  		atomic_set(&ns->pidmap[i].nr_free, BITS_PER_PAGE);
>
> +	if (pid_ns_prepare_proc(ns))
> +		goto out_free_map;
> +
>  	return ns;

Afaics, this is wrong.

If pid_ns_prepare_proc() fails we shouldn't blindly return ENOMEM
and, more importantly, we need put_pid_ns(parent_ns).

Oleg.

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