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

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Date:	Sat, 22 Nov 2014 14:56:17 +0100
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Rik van Riel <riel@...hat.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

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.


--
     Manfred
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