Re: IA64/x86-64 and execution protection support?

From: David Mosberger
Date: Mon Nov 03 2003 - 11:49:51 EST

>>>>> On Mon, 3 Nov 2003 08:49:33 -0600, Joseph Pingenot <trelane@xxxxxxxxxxxxxx> said:

Joseph> Hello. I was reading El Reg this morning when they
Joseph> discussed "execution protection" on the new Intel (IA64) and
Joseph> AMD (K8 and above) chips. Does the Linux kernel have
Joseph> support for preventing execution of certain memory regions
Joseph> on those architectures?

Yes, on ia64, data and stack do not get mapped executable by default.
Also, return addresses (under the discretion of the compiler) are
virtually always stored on a separate register stack, making it more
difficult to use memory stack overflows to overwrite return addresses.

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