linux-kernel - Re: [RFC][PATCH 00/10] taskstats: Enhancements for precise accounting

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Message-ID: <20100925181928.GA19611@hallyn.com>
Date:	Sat, 25 Sep 2010 13:19:28 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Matt Helsley <matthltc@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Shailabh Nagar <nagar1234@...ibm.com>,
	linux-s390@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Venkatesh Pallipadi <venki@...gle.com>,
	John stultz <johnstul@...ibm.com>,
	containers@...ts.linux-foundation.org,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, holzheu@...ux.vnet.ibm.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 00/10] taskstats: Enhancements for precise
 accounting

Quoting Matt Helsley (matthltc@...ibm.com):
> I don't think even "root" can see/use pids outside its namespace (without

Just to be clear on this, you're right in what you say, but if a task in a child
pidns still has access to the /proc mount of the parent pidns, then it can see
the pids in there, and get information from them, i.e. /proc/pid/maps.  So
in that sense, some people could misinterpret "see/use pids" and think you
weren't right.

-serge
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