linux-kernel - Re: [RFC PATCH 4/5] selftest/x86: Fix sysret

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Date:   Thu, 21 May 2020 23:34:27 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, 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>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [RFC PATCH 4/5] selftest/x86: Fix sysret_rip with ENDBR

Yu-cheng Yu <yu-cheng.yu@...el.com> writes:

> Insert endbr64 to assembly code of sysret_rip.

This changelog explains what the patch does, but not the WHY. It also
lacks any information why this is harmless for !CET enabled systems.

> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> ---

Please consult Dave Hansen about the void between your Signed-off-by
and the '---' line.

Thanks,

        tglx