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From: Anton Vorontsov <anton.vorontsov@linaro.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Paul Mundt <lethal@linux-sh.org>,
	Russell King <linux@arm.linux.org.uk>,
	Mike Frysinger <vapier@gentoo.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Richard Weinberger <richard@nod.at>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/8] Fixes for common mistakes w/ for_each_process and task->mm
Date: Tue, 7 Feb 2012 10:48:09 +0400	[thread overview]
Message-ID: <20120207064809.GA29061@oksana.dev.rtsoft.ru> (raw)

Hi all,

While working on lowmemorykiller driver, I stumbled upon several places
where we traverse the tasklist in an unsafe manner, plus there are a
few cases of unsafe access to task->mm.

Note that some patches were not tested (e.g. sh, blackfin), so please
take a closer look if there's silly mistakes. Also special attention
needed for patch 7/8 (UML specific).

Oleg,

For sysrq case I kept the force_sig() usage, this is because in sysrq
case I belive we do want to kill PID namespace init processes. If using
force_sig() is still a bad idea, I guess we should fix it somehow
else.

Thanks.

-- 
Anton Vorontsov
Email: cbouatmailru@gmail.com

             reply	other threads:[~2012-02-07  6:48 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-07  6:48 Anton Vorontsov [this message]
2012-02-07  6:49 ` [PATCH 1/8] sysrq: Fix possible race with exiting task Anton Vorontsov
2012-02-09  1:47   ` David Rientjes
2012-02-07  6:49 ` [PATCH 2/8] sysrq: Properly check for kernel threads Anton Vorontsov
2012-02-09  1:46   ` David Rientjes
2012-02-07  6:50 ` [PATCH 3/8] arm: Fix possible race on task->mm Anton Vorontsov
2012-02-08 16:08   ` Oleg Nesterov
2012-02-09 15:33     ` Anton Vorontsov
2012-02-09 15:43       ` Anton Vorontsov
2012-02-10 20:21         ` Oleg Nesterov
2012-02-09  1:46   ` David Rientjes
2012-02-07  6:50 ` [PATCH 4/8] powerpc/mm: " Anton Vorontsov
2012-02-07  6:50 ` [PATCH 5/8] sh: " Anton Vorontsov
2012-02-07  6:50 ` [PATCH 6/8] blackfin: " Anton Vorontsov
2012-02-08 16:20   ` Oleg Nesterov
2012-02-07  6:51 ` [PATCH 7/8] um: Should hold tasklist_lock while traversing processes Anton Vorontsov
2012-02-07  6:51 ` [PATCH 8/8] um: Fix possible race on task->mm Anton Vorontsov
2012-02-08 15:59 ` [PATCH 0/8] Fixes for common mistakes w/ for_each_process and task->mm Oleg Nesterov

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