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

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Date:   Mon, 19 Nov 2018 14:43:31 -0800
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Andy Lutomirski <luto@...capital.net>
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, 2018-11-19 at 14:17 -0800, Andy Lutomirski wrote:
> 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
> 
> 
> What's this hunk about?

We used to allow using non-CET capable BINUTILS and the Makefile would create
these.  I will remove them from the patch.

Yu-cheng