Re: [RFC PATCH v2 2/6] x86/arch_prctl: add ARCH_GET_NOPTI and ARCH_SET_NOPTI to enable/disable PTI

[Ingo Molnar]

* Borislav Petkov <bp@xxxxxxxxx> wrote:

> Oh, and you've built the kernel with the option to be able to disable
> PTI so it's not like you haven't seen it already.

In general in many corporate environments requiring kernel reboots or kernel 
rebuilds limits the real-world usability of any kernel feature we offer down to 
"non-existent". Saying "build your own kernel or reboot" is excluding a large 
subset of our real-world users.

Build and boot options are fine for developers and testing. Otherwise _everything_ 
not readily accessible when your distro kernel has booted up is essentially behind 
a usability (and corporate policy) wall so steep that it's essentially 
non-existent to many users.

So either we make this properly sysctl (and/or prctl) controllable, or just don't 
do it at all.

Thanks,

	Ingo