linux-kernel - Re: [PATCH 2/4] ipc/shm.c: check for overflows of shm

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Message-ID: <1398190732.2473.9.camel@buesod1.americas.hpqcorp.net>
Date:	Tue, 22 Apr 2014 11:18:52 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	Davidlohr Bueso <davidlohr.bueso@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	gthelen@...gle.com, aswin@...com, linux-mm@...ck.org
Subject: Re: [PATCH 2/4] ipc/shm.c: check for overflows of shm_tot

On Mon, 2014-04-21 at 16:26 +0200, Manfred Spraul wrote:
> shm_tot counts the total number of pages used by shm segments.
> 
> If SHMALL is ULONG_MAX (or nearly ULONG_MAX), then the number
> can overflow.  Subsequent calls to shmctl(,SHM_INFO,) would return
> wrong values for shm_tot.
> 
> The patch adds a detection for overflows.
> 
> Signed-off-by: Manfred Spraul <manfred@...orfullife.com>

Acked-by: Davidlohr Bueso <davidlohr@...com>

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