linux-kernel - Re: [PATCH] ipc,sem block sem_lock on sma->lock during sma initialization

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Date:	Sat, 22 Nov 2014 10:53:20 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Manfred Spraul <manfred@...orfullife.com>,
	Davidlohr Bueso <dave@...olabs.net>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Rafael Aquini <aquini@...hat.com>
Subject: Re: [PATCH] ipc,sem block sem_lock on sma->lock during sma initialization

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On 11/22/2014 08:56 AM, Manfred Spraul wrote:
> Hi Rik,
> 
> good catch - I completely forgot to check the initialization
> 
> On 11/22/2014 04:40 AM, Rik van Riel wrote:
>> 
>> newary initializes a bunch of things after the call to ipc_addid,
>> however some things are initialized inside ipc_addid as well
>> 
>> Looking closer at newary, I suppose that it should be possible to
>> move those other initializations before the call to ipc_addid.
>> That would likely get rid of the problem, too.
>> 
>> However, I also see this line in newary, and I have no idea what
>> protects that data:
>> 
>> ns->used_sems += nsems;
> It should be sem_ids.rwsem, and at least according to the
> documentation both freeary() and newary() hold it.

You're right, that is properly protected already.

- -- 
All rights reversed
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