Kees Cook <[email protected]> writes:
> Please note that these bounds checks aren't correct to begin with. Since
> a pointer is being dereferenced, the end boundry must be reduced by
> sizeof(unsigned long) as well.
>
> It looks like process_32.c suffers the same problems, too.
I can't see the end boundary problem in process_32.c. The end checks
are properly reduced with the top_esp and top_ebp macros.
All I can see in process_32.c is that the check
if (bp < stack_page || bp > top_ebp+stack_page)
could be replaced by:
if (bp < stack_page-sizeof(unsigned long) || bp >
top_ebp+stack_page)
but that is a relaxation and not an over/underrun fix.
Can you elaborate what problem you see in process_32.c?
Regards,
Wolfram.
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