Date: Wed, 27 Aug 2008 10:10:55 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Andrew Reilly <andrew-freebsd@areilly.bpc-users.org> Cc: Matthew Macy <mat.macy@gmail.com>, Alfred Perlstein <alfred@freebsd.org>, Ivan Voras <ivoras@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: FreeBSD and DEP aka "NX bit"? Message-ID: <alpine.BSF.1.10.0808271009340.60038@fledge.watson.org> In-Reply-To: <20080827011949.GA98242@duncan.reilly.home> References: <g8q8i5$s9g$2@ger.gmane.org> <3c1674c90808231713x47e42de5oa9fc2f2f244d2e74@mail.gmail.com> <20080826074943.GB85357@duncan.reilly.home> <20080826162807.GF16977@elvis.mu.org> <20080827011949.GA98242@duncan.reilly.home>
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On Wed, 27 Aug 2008, Andrew Reilly wrote: > On Tue, Aug 26, 2008 at 09:28:07AM -0700, Alfred Perlstein wrote: >> * Andrew Reilly <andrew-freebsd@areilly.bpc-users.org> [080826 00:51] >> wrote: >>> I've been using 7-STABLE on amd64 for a long time, and haven't noticed any >>> problems with Java or SBCL lisp or PLT-scheme, all of which use JIT code >>> generation (but probably neither use jemalloc?) >> >> mprotect(2)? > > Fair enough. Good to know that it's actually tweaking the NX permissions, I > guess. The man page seems a little vague about when it might succeed, and > what effect it might have... We're behind on the not-mapping-writable stuff, so for better (and worse) quite a few such things in application have been faulted in by other operating systems already. That doesn't mean there won't be issues, but does have the redeeming aspect that things should be less bumpy for us going forward. Hopefully we can start making that progress a bit more quickly... Robert N M Watson Computer Laboratory University of Cambridge
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