PRC wrote: > I am confused. In x86 architecture, the physical memory pages have either Read or Write attributes. That's taking a rather naive view, as there exist several technologies to emulate or approximate the NX bit for 32 bit x86 (Exec Shield, PaX), and you must be using a distro/kernel that uses one of them. Or if you're using a x86_64 machine in 32 bit mode the kernel can still use the hardware NX bit, assuming it's been configured properly. But this doesn't have anything to do with gcc, it's a function of the kernel/operating system, so it's sort of off-topic for this list. FWIW your testcase ran without segfault for me on a vanilla 32 bit linux without any of the above. Brian
