linux-kernel - Re: [PATCH 1/6] ksm: limiting the num of mem regions user can register per fd.

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Message-ID: <20090502220829.392b7ff9@riellaptop.surriel.com>
Date:	Sat, 2 May 2009 22:08:29 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Izik Eidus <ieidus@...hat.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	aarcange@...hat.com, chrisw@...hat.com, alan@...rguk.ukuu.org.uk,
	device@...ana.org, linux-mm@...ck.org, hugh@...itas.com,
	nickpiggin@...oo.com.au, Izik Eidus <ieidus@...hat.com>
Subject: Re: [PATCH 1/6] ksm: limiting the num of mem regions user can
 register per fd.

On Sun,  3 May 2009 01:16:07 +0300
Izik Eidus <ieidus@...hat.com> wrote:

> Right now user can open /dev/ksm fd and register unlimited number of
> regions, such behavior may allocate unlimited amount of kernel memory
> and get the whole host into out of memory situation.

How many times can a process open /dev/ksm?

If a process can open /dev/ksm a thousand times and then
register 1000 regions through each file descriptor, this
patch does not help all that much...

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