On Thu, Aug 13, 2015 at 2:26 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
> VERW is no good, because it considers non-present segments to be
> writable. Test cases for the win!
Seriously? That's crazy. I don't think I've actually ever used VERW,
but the documentation certainly says that the segment has to be
writable, and I quote
"The validation performed is the same as is performed when a segment
selector is loaded into the DS, ES, FS, or GS register, and the
indicated access (read or write) is performed"
which damn well shouldn't work for non-present segments. Odd.
Linus
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