linux-kernel - Re: [RFC c/r 3/4] c/r: procfs: add arg_start/end, env_start/end and exit

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Message-ID: <20120127201022.GP11086@moon>
Date:	Sat, 28 Jan 2012 00:10:22 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ebiederm@...ssion.com, xemul@...nvz.org, xemul@...allels.com,
	serge.hallyn@...onical.com, keescook@...omium.org,
	kamezawa.hiroyu@...fujitsu.com, adobriyan@...il.com, tj@...nel.org,
	avagin@...nvz.org, segoon@...nwall.com
Subject: Re: [RFC c/r 3/4] c/r: procfs: add arg_start/end, env_start/end and
 exit_code members to /proc/$pid/stat

On Fri, Jan 27, 2012 at 03:00:37PM -0500, KOSAKI Motohiro wrote:
...
> 
> > +
> > +		seq_printf(m, "%d\n", task->exit_code);
> > +
> 
> Bad this part seems to make new side channel. exit_code is one of
> inter process communication messages. IPC messages should NOT be
> observed from completely unrelated proesses.
> 

You mean we need "permitted" test here, right?

	Cyrill
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