Re: WordPad/riched20.dll buffer overflow

[Pavel Machek]

Hi!

> The 386 and up supports no-exec, but only on differing segments.  Most OS
> systems aren't properly implemented on the 386+ architecture.  The 386+
> supports read-only pages in the paging architecture, but to separate
> executable code from stack and data, you have to point the segment
> registers at differing memory areas.  If they overlap, which simplifies
> memory management, then the code, data and stack are all shared.  An
> entire segment, according to the Intel documentation, can set aside as
> non-executable.

It not only simplifies code, it also makes it faster. Segments are
obsolete, and intel knows that.
                                                                Pavel
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