Quoting Grégoire Sutre, who wrote the following on Thu, 24 Dec 2009:
Seth Goldberg wrote:
Your problem is probably lack of executable stack support, or at least
you haven't linked your application with a linker mapfile that specifies an
executable stack -- the callbacks require the use of trampolines to access
local variables, which require an executable stack.
Thanks a lot for your answer ! That explains it :-)
I tried linking with -Wl,-z,execstack, but with no success, even though
readelf shows a new header with this option:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
But the problem may come from NetBSD's default policy of non-executable stack
on i386 (http://www.netbsd.org/docs/kernel/non-exec.html).
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
:).
--S
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