linux-kernel - Re: [RFC PATCH v9 01/27] Documentation/x86: Add CET description

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Message-ID: <b0e7e487d1bf92bf19df2ecf199b90c76d9097dd.camel@intel.com>
Date:   Thu, 06 Feb 2020 12:17:30 -0800
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>, 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>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>, x86-patch-review@...el.com
Subject: Re: [RFC PATCH v9 01/27] Documentation/x86: Add CET description

On Wed, 2020-02-05 at 16:16 -0800, Randy Dunlap wrote:
> Hi,
> 
> I have a few comments and a question (please see inline below).
> 
> 
> On 2/5/20 10:19 AM, Yu-cheng Yu wrote:
[...]
> > +arch_prctl(ARCH_X86_CET_LOCK)
> > +    Lock in CET feature.
> 
> which feature?

Both SHSTK and IBT are locked.  They cannot be turned off afterwards.

I will check things you pointed out.

Thanks,
Yu-cheng