On Mon, Mar 9, 2009 at 11:50 PM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > as far as I can remember, in x86 architecture, hardware-wise, it is > NOT possible to enable NX. U may do anything via software, but it > will not be enabled. NX feature is only for 64bit OS. > No, NX is available for 32bit Linux, as long as PAE is enable. I am still stuck here (on 32bit Linux). It seems nobody can shed some lights in this problem? Thanks, H > On Mon, Mar 9, 2009 at 4:27 AM, NAHieu <nahieu@xxxxxxxxx> wrote: >> Hi, >> >> I inspect my Linux memory, and it seems that there is no area that >> prohibite execution like I expected (using NX bit in modern CPU). That >> really surprises me. >> >> I looked at some potential data areas exported in System.map file, like: >> >> - mark_rodata_ro >> - sysctl_data >> - new_cpu_data >> - boot_cpu_data >> >> And all of these areas allow to execute code (because NX=0 there). Is >> that really desirable? >> >> Anybody know for sure which area (easier to check if exported in >> System.map) doesnt allow execute? >> >> I can confirm that NX is active in my machine (reported in dmesg) >> >> Thanks, >> H >> >> -- >> To unsubscribe from this list: send an email with >> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >> Please read the FAQ at http://kernelnewbies.org/FAQ >> >> > > > > -- > Regards, > Peter Teoh > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
