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

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Date:   Thu, 3 Feb 2022 15:58:49 -0600
From:   John Allen <john.allen@....com>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H . J . Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        joao.moreira@...el.com, kcc@...gle.com, eranian@...gle.com
Subject: Re: [PATCH 35/35] x86/cpufeatures: Limit shadow stack to Intel CPUs

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?

Thanks,
John