linux-kernel - Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements

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Date:	Sat, 22 Dec 2012 00:46:08 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	<serge.hallyn@...onical.com>, <ebiederm@...ssion.com>,
	<linux-kernel@...r.kernel.org>, <xemul@...allels.com>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<jmorris@...ei.org>, <cmetcalf@...era.com>, <joe.korty@...r.com>,
	<dhowells@...hat.com>, <dledford@...hat.com>,
	<viro@...iv.linux.org.uk>, <kosaki.motohiro@...fujitsu.com>,
	<linux-api@...r.kernel.org>, <serue@...ibm.com>,
	<tglx@...utronix.de>, <paulmck@...ux.vnet.ibm.com>,
	<devel@...nvz.org>, <mtk.manpages@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements

21.12.2012 00:47, Andrew Morton пишет:
> On Thu, 20 Dec 2012 08:06:32 +0400
> Stanislav Kinsbursky<skinsbursky@...allels.com>  wrote:
>
>> 19.12.2012 00:36, Andrew Morton __________:
>>> On Wed, 24 Oct 2012 19:34:51 +0400
>>> Stanislav Kinsbursky<skinsbursky@...allels.com>  wrote:
>>>
>>>> This respin of the patch set was significantly reworked. Most part of new API
>>>> was replaced by sysctls (by one per messages, semaphores and shared memory),
>>>> allowing to preset desired id for next new IPC object.
>>>>
>>>> This patch set is aimed to provide additional functionality for all IPC
>>>> objects, which is required for migration of these objects by user-space
>>>> checkpoint/restore utils (CRIU).
>>>>
>>>> The main problem here was impossibility to set up object id. This patch set
>>>> solves the problem by adding new sysctls for preset of desired id for new IPC
>>>> object.
>>>>
>>>> Another problem was to peek messages from queues without deleting them.
>>>> This was achived by introducing of new MSG_COPY flag for sys_msgrcv(). If
>>>> MSG_COPY flag is set, then msgtyp is interpreted as message number.
>>> According to my extensive records, Sasha hit a bug in
>>> ipc-message-queue-copy-feature-introduced.patch and Fengguang found a
>>> bug in
>>> ipc-message-queue-copy-feature-introduced-cleanup-do_msgrcv-aroung-msg_copy-feature.patch
>>>
>>> It's not obvious (to me) that these things have been identified and
>>> fixed.  What's the status, please?
>> Hello, Andrew.
>> Fengguang's issue was solved by "ipc: simplify message copying" I sent you.
>> But I can't find Sasha's issue. As I remember, there was some problem in
>> early
>> version of the patch set. But I believe its fixed now.
> http://lkml.indiana.edu/hypermail/linux/kernel/1210.3/01710.html
>
> Subject: "ipc, msgqueue: NULL ptr deref in msgrcv"

Ah, yes. Thanks.
Hi found it in initial version of code, which was significantly changed 
(or cleaned and simplified) by further patch series.
And I cant find out, how this can happen, because this patch he bisect 
to do not modify the queue itself, while he found the problem in testmsg.


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