Quoting Grégoire Sutre, who wrote the following on Thu, 24 Dec 2009:
Seth Goldberg wrote:
Exactly -- the presence of the execstack attribute in the segment is
merely a request -- the kernel is free to discard it, and many OSes do, as
you've found :).
The problem is more complex: I tried a simple example with a pointer to a
nested function, and it runs without any segfault on NetBSD/i386.
This would suggest that, by default, the stack is executable -- at least if
trampolines are used?
It depends how the page tables are configured on that kernel -- if the NX bit
isn't being set in page table entries on that platform, then the hardware
support for execute-protection isn't enabled and you won't get any faults.
--S
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