September 29, 2008 at 00:28Enable NX-bit in 32-bit core on 64-bit CPU
After reading en.wikipedia.org/wiki/NX_bit#Linux, I learned that Linux has long (since 2.6.8) supported NX-bits for 64-bit CPUs, even if the kernel is 32-bit.
In the list of changes I found a link to instructions for its inclusion. You just need to rebuild the kernel by enabling the option
After rebuilding the kernel, modules, and rebooting the system.
It should be shown: I
didn’t notice a decrease in performance, and, theoretically, the security improved.
The transition to the 64-bit kernel is prevented by a couple of proprietary packages that do not have 64-bit assemblies. And I don’t want to install multilib (additionally 32-bit libraries).
In the list of changes I found a link to instructions for its inclusion. You just need to rebuild the kernel by enabling the option
CONFIG_HIGHMEM64G. After rebuilding the kernel, modules, and rebooting the system.
# dmesg | grep NXIt should be shown: I
NX (Execute Disable) protection: activedidn’t notice a decrease in performance, and, theoretically, the security improved.
The transition to the 64-bit kernel is prevented by a couple of proprietary packages that do not have 64-bit assemblies. And I don’t want to install multilib (additionally 32-bit libraries).
