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?
I forgot to add: the NX bit is only supported when PAE mode is enabled on a
32-bit kernel, so if NetBSD/i386 isn't using PAE mode (for whatever reason),
the NX bit won't be supported.
--S
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