linux-kernel - Re: [RFC PATCH 5/5] selftest/x86: Add CET quick test

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Message-ID: <202005221034.59F5DF75@keescook>
Date:   Fri, 22 May 2020 10:36:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>, 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>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>
Subject: Re: [RFC PATCH 5/5] selftest/x86: Add CET quick test

On Fri, May 22, 2020 at 07:27:11PM +0200, Peter Zijlstra wrote:
> On Fri, May 22, 2020 at 10:22:51AM -0700, Kees Cook wrote:
> 
> > But yes, I think getting a copy of asm.h would be nice here. I don't
> > think the WRITE_ONCE() is needed in this particular case. Hmm.
> 
> Paranoia on my end because I had no clue wth he wanted with his -O0
> magic gunk.

Heh, yes, which is why I asked for many more comments. ;) I *think* it
was entirely to control the stack (and ssp) behavior (i.e. don't inline,
don't elide unused stack variables, etc).

-- 
Kees Cook