linux-kernel - Re: [PATCH] sysctl: Add the kernel.ns_last

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Message-ID: <20111128155315.GA18864@google.com>
Date:	Mon, 28 Nov 2011 07:53:15 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH] sysctl: Add the kernel.ns_last_pid control

On Mon, Nov 28, 2011 at 07:21:25PM +0400, Pavel Emelyanov wrote:
> +static int pid_ns_ctl_handler(struct ctl_table *table, int write,
> +		void __user *buffer, size_t *lenp, loff_t *ppos)
> +{
> +	struct ctl_table tmp = *table;
> +
> +	if (write && !capable(CAP_SYS_ADMIN))
> +		return -EPERM;
> +
> +	/*
> +	 * Writing directly to ns' last_pid field is OK, since this field
> +	 * is volatile in a living namespace anyway and a code writing to
> +	 * it should synchronize its usage with external means.
> +	 */

I would still prefer using set_last_pid() but if you insist to update
last_pid directly, please note the direct update in the comment on top
of set_last_pid() too.

Other than that,

  Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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