Date: Sat, 29 Oct 2005 14:12:57 +0000 From: db <db@traceroute.dk> To: Jimmy Scott <jimmy@inet-solutions.be>, freebsd-security@freebsd.org Subject: Re: Non-executable stack Message-ID: <200510291412.57656.db@traceroute.dk> In-Reply-To: <20051029131519.GA22254@ada.devbox.be> References: <200510270608.51571.db@traceroute.dk> <200510291242.16461.db@traceroute.dk> <20051029131519.GA22254@ada.devbox.be>
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On Saturday 29 October 2005 13:15, you wrote: > The thing you are refering to is W^X using the NXE register of the amd64 > if I'm not mistaken, marking memory pages as writable or executable, > but not both. (The thing also works on i386 using an ugly hack). Yeah. Memory on ia32 can be writable and readable. When it is readable it is also executable. On other arch's like AMD64 and IA64, I believe memory can be readable, writable and executable. Therefore I would like to remove the executable bit on the stack and heap for the systems supporting it. br db
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