From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752035AbZECCMi (ORCPT ); Sat, 2 May 2009 22:12:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751047AbZECCM3 (ORCPT ); Sat, 2 May 2009 22:12:29 -0400 Received: from mx2.redhat.com ([66.187.237.31]:43216 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750892AbZECCM3 (ORCPT ); Sat, 2 May 2009 22:12:29 -0400 Date: Sat, 2 May 2009 22:08:29 -0400 From: Rik van Riel To: Izik Eidus Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, aarcange@redhat.com, chrisw@redhat.com, alan@lxorguk.ukuu.org.uk, device@lanana.org, linux-mm@kvack.org, hugh@veritas.com, nickpiggin@yahoo.com.au, Izik Eidus Subject: Re: [PATCH 1/6] ksm: limiting the num of mem regions user can register per fd. Message-ID: <20090502220829.392b7ff9@riellaptop.surriel.com> In-Reply-To: <1241302572-4366-2-git-send-email-ieidus@redhat.com> References: <1241302572-4366-1-git-send-email-ieidus@redhat.com> <1241302572-4366-2-git-send-email-ieidus@redhat.com> Organization: surriel Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 3 May 2009 01:16:07 +0300 Izik Eidus 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... -- All rights reversed.