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

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Message-Id: <20141124124907.a8ba40e5.akpm@linux-foundation.org>
Date:	Mon, 24 Nov 2014 12:49:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <davidlohr@...com>,
	Rafael Aquini <aquini@...hat.com>, 1vier1@....de
Subject: Re: [PATCH] ipc,sem block sem_lock on sma->lock during sma
 initialization

On Sun, 23 Nov 2014 19:23:53 +0100 Manfred Spraul <manfred@...orfullife.com> wrote:

> Subject: [PATCH] ipc/sem.c: Fully initialize sem_array before making it
>  visible
> 
> ipc_addid() makes a new ipc identifier visible to everyone.
> New objects start as locked, so that the caller can complete
> the initialization after the call.
> Within struct sem_array, at least sma->sem_base and sma->sem_nsems
> are accessed without any locks, therefore this approach doesn't work.
> 
> Thus: Move the ipc_addid() to the end of the initialization.

Any thoughts on which kernel version(s) need the patch?  I'm still
rather fuzzy on the end-user impact of this bug.

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