Re: [PATCH 07/34] x86/entry/32: Restore segments before int registers

[Joerg Roedel]

On Mon, Mar 05, 2018 at 12:50:33PM -0800, Linus Torvalds wrote:
> On Mon, Mar 5, 2018 at 12:38 PM, Brian Gerst <brgerst@xxxxxxxxx> wrote:
> >
> > There already is a test: single_step_syscall.c
> 
> Ahh, good. So presumably Joerg actually did check it, just didn't even notice ;)

Yeah, sort of. I ran the test, but it didn't catch the failure case in
previous versions which was return to user with kernel-cr3 :)

I could probably add some debug instrumentation to check for that in my
future testing, as there is no NX protection in the user address-range
for the kernel-cr3.


	Joerg