linux-kernel - Re: [PATCH v11 8/9] x86/vdso: Insert endbr32/endbr64 to vDSO

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Message-ID: <d0415682-f722-d60d-1d40-f29e6dffa218@intel.com>
Date:   Tue, 25 Aug 2020 09:13:02 -0700
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
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>,
        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>
Subject: Re: [PATCH v11 8/9] x86/vdso: Insert endbr32/endbr64 to vDSO

On 8/24/2020 5:33 PM, Andy Lutomirski wrote:
> On Mon, Aug 24, 2020 at 5:30 PM Yu-cheng Yu <yu-cheng.yu@...el.com> wrote:
>>
>> From: "H.J. Lu" <hjl.tools@...il.com>
>>
>> When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be
>> called indirectly, and must have ENDBR32 or ENDBR64 as the first
>> instruction.  The 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>
>> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
>> Acked-by: Andy Lutomirski <luto@...nel.org>
> 
> I revoke my Ack.  Please don't repeat the list of object files.  Maybe
> add the option to CFL?

I will update the patch.

Yu-cheng