Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965013AbVJUQKu (ORCPT ); Fri, 21 Oct 2005 12:10:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965014AbVJUQKu (ORCPT ); Fri, 21 Oct 2005 12:10:50 -0400 Received: from tardis.csc.ncsu.edu ([152.14.51.184]:20160 "EHLO tardis.csc.ncsu.edu") by vger.kernel.org with ESMTP id S965013AbVJUQKt (ORCPT ); Fri, 21 Oct 2005 12:10:49 -0400 Message-ID: <43591307.5050507@csc.ncsu.edu> Date: Fri, 21 Oct 2005 12:10:47 -0400 From: "Vincent W. Freeh" User-Agent: Mozilla Thunderbird 1.0.6-1.1.fc4 (X11/20050720) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: Understanding Linux addr space, malloc, and heap References: <4358F0E3.6050405@csc.ncsu.edu> <1129903396.2786.19.camel@laptopd505.fenrus.org> <4359051C.2070401@csc.ncsu.edu> <1129908179.2786.23.camel@laptopd505.fenrus.org> <43590B23.2090101@csc.ncsu.edu> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 884 Lines: 22 First, thanks for all the help and attention. I am learning much. I think the focus of this discussion should be on mprotect. I understand that spec says it only works on mmap'd memory. So does malloc use mmap? If not why does it work at all? Probably the most problematic issue, tho, is why does mprotect return 0 even though it failed to change permissions on the 66th page? Kyle Moffett wrote: > On Oct 21, 2005, at 11:37:07, Vincent W. Freeh wrote: > You *cannot* reliably expect to mprotect() the results of malloc(). If > you want to mprotect() things, you _must_ do it on mmap()ed memory. > > Cheers, > Kyle Moffett > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/