linux-kernel - Re: [PATCH v8 01/27] Documentation/x86: Add CET description

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Message-ID: <84fc1b3bb2dbcf52ca79cb1141a431e087f082b5.camel@intel.com>
Date:   Wed, 14 Aug 2019 08:57:19 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Florian Weimer <fweimer@...hat.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@...capital.net>,
        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>,
        "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>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v8 01/27] Documentation/x86: Add CET description

On Wed, 2019-08-14 at 10:07 +0200, Florian Weimer wrote:
> * Yu-cheng Yu:
> 
> > +ENDBR
> > +    The compiler inserts an ENDBR at all valid branch targets.  Any
> > +    CALL/JMP to a target without an ENDBR triggers a control
> > +    protection fault.
> 
> Is this really correct?  I think ENDBR is needed only for indirect
> branch targets where the jump/call does not have a NOTRACK prefix.

You are right.  I will fix the wording.

Yu-cheng