Re: [PATCH 35/35] x86/cpufeatures: Limit shadow stack to Intel CPUs

H.J. Lu
2022-02-03T22:24:23Z

On Thu, Feb 3, 2022 at 1:58 PM John Allen <john.allen@amd.com> wrote:
>
> On Sun, Jan 30, 2022 at 01:18:38PM -0800, Rick Edgecombe wrote:
> > Shadow stack is supported on newer AMD processors, but the kernel
> > implementation has not been tested on them. Prevent basic issues from
> > showing up for normal users by disabling shadow stack on all CPUs except
> > Intel until it has been tested. At which point the limitation should be
> > removed.
>
> Hi Rick,
>
> I have been testing Yu-Cheng's patchsets on AMD hardware and I am
> working on testing this version now. How are you testing this new
> series? I can partially test by calling the prctl enable for shadow
> stack directly from a program, but I'm not sure how useful that's going
> to be without the glibc support. Do you have a public repo with the
> necessary glibc changes to enable shadow stack early?
>

The glibc CET branch is at

https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/cet/master

--
H.J.