On Tue, Jan 09, 2018 at 07:32:01PM +0100, Thomas Trepl wrote:
> > [ 0.000000] Kernel/User page tables isolation: enabled
> >
> > then it should be active. At least on x64_64 such a line comes up
> > (with 4.14.12).
> >
> > Will do a i686 build today...
>
> Did so. Looks like the KPTI stuff is somehow different (if at all)
> implemented for 32bit kernels. Indeed, the option to select
> CONFIG_PAGE_TABLE_ISOLATION isn't available and when booting a fresh
> i686-4.14.12 kernel it does not show the "Kernel/User page tables
> isolation: enabled" message. Havn't found much info about KPTI on i686
> yet. Nevertheless, when running the i686 kernel on a Xeon-E3-1245
> /proc/cpuinfo says "bugs : cpu_insecure". So, at least a bit has
> changed for 32bit-kernels, too.
>
> Does anyone have more insights here?
>
See my reply from last night or early this morning - it looks as if
PTI is not available on 32-bit x86.
ĸen
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