linux-kernel - Re: [RFC PATCH v3 05/24] Documentation/x86: Add CET description

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Message-ID: <1536959832.12990.34.camel@intel.com>
Date:   Fri, 14 Sep 2018 14:17:12 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Pavel Machek <pavel@....cz>
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@...capital.net>,
        Balbir Singh <bsingharora@...il.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.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>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Subject: Re: [RFC PATCH v3 05/24] Documentation/x86: Add CET description

On Thu, 2018-08-30 at 22:39 +0200, Pavel Machek wrote:
> Hi!
> 
> > 
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt
> > b/Documentation/admin-guide/kernel-parameters.txt
> > index 9871e649ffef..b090787188b4 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -2764,6 +2764,12 @@
> >  			noexec=on: enable non-executable mappings (default)
> >  			noexec=off: disable non-executable mappings
> >  
> > +	no_cet_ibt	[X86-64] Disable indirect branch tracking for
> > user-mode
> > +			applications
> > +
> > +	no_cet_shstk	[X86-64] Disable shadow stack support for user-
> > mode
> > +			applications
> Hmm, not too consistent with "nosmap" below. Would it make sense to
> have cet=on/off/ibt/shstk instead?

We also have noxsave, noxsaveopt, noxsaves, etc.  This style is more decisive?
If "cet=" is preferred, we can change it later?

Yu-cheng