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FreeBSD x86 vs x86-64 Questions about Security
- Subject: FreeBSD x86 vs x86-64 Questions about Security
- From: zombyfork at gmail.com (Coleman Kane)
- Date: Fri Feb 11 06:30:43 2005
On Fri, 11 Feb 2005 07:54:05 +0000, Jimmy <freebsd_(_at_)_oranged_(_dot_)_to> wrote:
> I Am interested to know several questions..
> - Currently I am using FreeBSD x86-64 I have compiled the majority of my
> applications up using the right compiler flags to support the 64bit OS.
> Is there any way within the Operating system that I can turn off 32bit
You should be able to remove COMPAT_IA32 from your kernel config.
> - Are applications that have been compiled for the amd-64 platform still
> vulnerable to x86 style attacks because of the backwards compatability
> mode? (eg remote buffer overflows in say.. openssh?).
AMD64 has a per-page NX (non-executable) bit, I however am not aware
if FreeBSD uses this in the code pages.
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