linux-kernel - Re: [PATCH v3] ipc,shm: disable shmmax and shmall by default

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Message-ID: <1397838812.19331.3.camel@buesod1.americas.hpqcorp.net>
Date:	Fri, 18 Apr 2014 09:33:32 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>, aswin@...com,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v3] ipc,shm: disable shmmax and shmall by default

On Fri, 2014-04-18 at 11:26 +0200, Manfred Spraul wrote:
> Hi Davidlohr,
> 
> On 04/18/2014 03:25 AM, Davidlohr Bueso wrote:
> > So a value of 0 bytes or pages, for shmmax and shmall, respectively,
> > implies unlimited memory, as opposed to disabling sysv shared memory.
> That might be a second risk:
> Right now, a sysadmin can prevent sysv memory allocations with
> 
>      # sysctl kernel.shmall=0

Yeah, I had pointed this out previously, and it is addressed in the
changelog. shmall = 0 directly contradicts size < shmmin = 1, so I don't
know who's wrong there...

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