Re: [PATCH v7 31/41] x86/shstk: Introduce routines modifying shstk

Borislav Petkov
2023-03-09T17:22:47Z

On Thu, Mar 09, 2023 at 05:03:26PM +0000, Edgecombe, Rick P wrote:
> On Thu, 2023-03-09 at 17:48 +0100, Borislav Petkov wrote:
> > On Mon, Feb 27, 2023 at 02:29:47PM -0800, Rick Edgecombe wrote:
> > > From: Yu-cheng Yu <yu-cheng.yu@intel.com>
> > >
> > > Shadow stacks are normally written to via CALL/RET or specific CET
> >
> > ^
> > indirectly.
>
> Dunno here, RSTORSSP/SAVEPREVSSP are kind of direct.
>
> >
> > > instructions like RSTORSSP/SAVEPREVSSP. However during some Linux
> > > operations the kernel will need to write to directly using the
^^^^^^^^^

Yes, I was trying to make the contrast more obvious because you say
"directly" here.

But not too important.

--
Regards/Gruss,
Boris.