From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 25 Sep 2000 16:47:21 -0400 (EDT) From: "Benjamin C.R. LaHaise" Subject: Re: the new VMt In-Reply-To: <20000925143523.B19257@hq.fsmlabs.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: yodaiken@fsmlabs.com Cc: "Stephen C. Tweedie" , MM mailing list , linux-kernel@vger.kernel.org List-ID: On Mon, 25 Sep 2000 yodaiken@fsmlabs.com wrote: > On Mon, Sep 25, 2000 at 09:23:48PM +0100, Alan Cox wrote: > > > my prediction is that if you show me an example of > > > DoS vulnerability, I can show you fix that does not require bean counting. > > > Am I wrong? > > > > I think so. Page tables are a good example > > I'm not too sure of what you have in mind, but if it is > "process creates vast virtual space to generate many page table > entries -- using mmap" > the answer is, virtual address space quotas and mmap should kill > the process on low mem for page tables. No. Page tables are not freed after munmap (and for good reason). The counting of page table "beans" is critical. -ben -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/