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.
http://en.wikipedia.org/wiki/NX_bit http://en.wikipedia.org/wiki/X86-64 On Mon, Mar 9, 2009 at 4:27 AM, NAHieu <[email protected]> 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 [email protected] > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
