John Bradford wrote:
> Slightly off-topic, but does anybody know whether IA64 or x86-64 allow
> you to make the stack non-executable in the same way you can on SPARC?
IA64 supports a mind-boggling variety of page-level protection modes,
including execute-only pages that usermode can jump to and get
'promoted' to lower (more privileged) levels. _And_ it supports
protection keys that can be attached to pages so your process needs
to have the key loaded into a register to touch those pages. The keys
can themselves be marked read/write/execute disable on loading, so
the supervisor can give you a key that keeps you from executing pages
even if their page-level protections would otherwise allow it.
AMD64 supports a simple NX (no execute) bit that keeps both supervisor
and user code from executing, and that's probably all anyone really needs.
------
Chuck
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