linux-kernel - Re: [RFC PATCH v6 08/11] x86: Insert endbr32/endbr64 to vDSO

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Message-ID: <CALCETrW9ABDotyM020V147+kuizpTRJUAANn-6kUt6-h0Qn0og@mail.gmail.com>
Date:   Mon, 19 Nov 2018 14:17:48 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc:     X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Balbir Singh <bsingharora@...il.com>,
        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>,
        "Shanbhogue, Vedvyas" <vedvyas.shanbhogue@...el.com>
Subject: Re: [RFC PATCH v6 08/11] x86: Insert endbr32/endbr64 to vDSO

On Mon, Nov 19, 2018 at 1:55 PM Yu-cheng Yu <yu-cheng.yu@...el.com> wrote:
>
> From: "H.J. Lu" <hjl.tools@...il.com>
>
> When Intel indirect branch tracking is enabled, functions in vDSO which
> may be called indirectly must have endbr32 or endbr64 as the first
> instruction.  Compiler must support -fcf-protection=branch so that it
> can be used to compile vDSO.
>
> Signed-off-by: H.J. Lu <hjl.tools@...il.com>
> ---
>  arch/x86/entry/vdso/.gitignore        |  4 ++++
>  arch/x86/entry/vdso/Makefile          | 12 +++++++++++-
>  arch/x86/entry/vdso/vdso-layout.lds.S |  1 +
>  3 files changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/entry/vdso/.gitignore b/arch/x86/entry/vdso/.gitignore
> index aae8ffdd5880..552941fdfae0 100644
> --- a/arch/x86/entry/vdso/.gitignore
> +++ b/arch/x86/entry/vdso/.gitignore
> @@ -5,3 +5,7 @@ vdso32-sysenter-syms.lds
>  vdso32-int80-syms.lds
>  vdso-image-*.c
>  vdso2c
> +vclock_gettime.S
> +vgetcpu.S
> +vclock_gettime.asm
> +vgetcpu.asm


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