Date: Sun, 31 Aug 2003 20:50:02 +0100 (BST) From: "=?iso-8859-1?q?Pedro=20F.=20Giffuni?=" <giffunip@yahoo.com> To: Peter Jeremy <PeterJeremy@optushome.com.au> Cc: freebsd-hackers@freebsd.org Subject: Re: Non-executable mappings now in NetBSD too Message-ID: <20030831195002.95875.qmail@web13403.mail.yahoo.com> In-Reply-To: <20030831091544.GA86421@cirb503493.alcatel.com.au>
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--- Peter Jeremy <PeterJeremy@optushome.com.au> wrote: ... > > Based on some recent BUGTRAQ postings, OpenBSD has a trick to support > full protection on the i386. The text segment and executable part of > shared libraries are placed at low virtual addresses and CS is > restricted to only cover the low address space. I don't know whether > it's worthwhile to implement something along these lines in FreeBSD. > I think we'll have to do it sooner or later simply because they do it ;). The issue is, of course, Linux emulation and backward compatibility. I think we could do the same but ignore the CS restriction if the user is trusted and running inside a jail. cheers, Pedro. ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://uk.messenger.yahoo.com/
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