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

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Date:	Thu, 20 Dec 2012 12:47:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
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

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"
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