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From: Andrew Morton <akpm@linux-foundation.org>
To: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: <serge.hallyn@canonical.com>, <ebiederm@xmission.com>,
	<linux-kernel@vger.kernel.org>, <xemul@parallels.com>,
	<catalin.marinas@arm.com>, <will.deacon@arm.com>,
	<jmorris@namei.org>, <cmetcalf@tilera.com>, <joe.korty@ccur.com>,
	<dhowells@redhat.com>, <dledford@redhat.com>,
	<viro@zeniv.linux.org.uk>, <kosaki.motohiro@jp.fujitsu.com>,
	<linux-api@vger.kernel.org>, <serue@us.ibm.com>,
	<tglx@linutronix.de>, <paulmck@linux.vnet.ibm.com>,
	<devel@openvz.org>, <mtk.manpages@gmail.com>,
	Sasha Levin <sasha.levin@oracle.com>,
	Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements
Date: Thu, 20 Dec 2012 12:47:51 -0800	[thread overview]
Message-ID: <20121220124751.d7ccbd8e.akpm@linux-foundation.org> (raw)
In-Reply-To: <50D28EC8.7000708@parallels.com>

On Thu, 20 Dec 2012 08:06:32 +0400
Stanislav Kinsbursky <skinsbursky@parallels.com> wrote:

> 19.12.2012 00:36, Andrew Morton __________:
> > On Wed, 24 Oct 2012 19:34:51 +0400
> > Stanislav Kinsbursky <skinsbursky@parallels.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"

  reply	other threads:[~2012-12-20 20:48 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-24 15:34 [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements Stanislav Kinsbursky
2012-10-24 15:35 ` [PATCH v8 1/5] ipc: remove forced assignment of selected message Stanislav Kinsbursky
2012-10-24 15:35 ` [PATCH v8 2/5] ipc: add sysctl to specify desired next object id Stanislav Kinsbursky
2012-10-24 21:41   ` Andrew Morton
2012-10-25  7:53     ` Stanislav Kinsbursky
2012-10-24 15:35 ` [PATCH v8 3/5] ipc: message queue receive cleanup Stanislav Kinsbursky
2012-10-24 15:35 ` [PATCH v8 4/5] ipc: message queue copy feature introduced Stanislav Kinsbursky
2012-10-24 21:41   ` Andrew Morton
2012-10-24 15:35 ` [PATCH v8 5/5] test: IPC message queue copy feture test Stanislav Kinsbursky
2012-10-24 21:42 ` [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements Andrew Morton
2012-12-18 20:36 ` Andrew Morton
2012-12-20  4:06   ` Stanislav Kinsbursky
2012-12-20 20:47     ` Andrew Morton [this message]
2012-12-21 20:46       ` Stanislav Kinsbursky
2012-12-21 21:57         ` Sasha Levin
2012-12-22 15:43           ` Sasha Levin
2013-01-09  8:24             ` Stanislav Kinsbursky
2013-01-14  6:31               ` Sasha Levin

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