linux-kernel - Re: [PATCH v15 01/26] Documentation/x86: Add CET description

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Message-ID: <a675b406-dcb9-ac38-3ecb-c98378d333cf@intel.com>
Date:   Mon, 30 Nov 2020 11:47:31 -0800
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Fāng-ruì Sòng <maskray@...gle.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Dave P Martin <Dave.Martin@....com>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        bsingharora@...il.com, Jonathan Corbet <corbet@....net>,
        dave.hansen@...ux.intel.com, esyr@...hat.com,
        Florian Weimer <fweimer@...hat.com>, gorcunov@...il.com,
        "H.J. Lu" <hjl.tools@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
        jannh@...gle.com, Kees Cook <keescook@...omium.org>,
        linux-api@...r.kernel.org, linux-arch <linux-arch@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        luto@...nel.org, mike.kravetz@...cle.com,
        Ingo Molnar <mingo@...hat.com>, nadav.amit@...il.com,
        oleg@...hat.com, pavel@....cz, pengfei.xu@...el.com,
        Peter Zijlstra <peterz@...radead.org>,
        ravi.v.shankar@...el.com, Randy Dunlap <rdunlap@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        vedvyas.shanbhogue@...el.com, weijiang.yang@...el.com,
        X86 ML <x86@...nel.org>, Luis Lozano <llozano@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        erich.keane@...el.com
Subject: Re: [PATCH v15 01/26] Documentation/x86: Add CET description

On 11/30/2020 11:38 AM, Fāng-ruì Sòng wrote:
> On Mon, Nov 30, 2020 at 10:34 AM Yu, Yu-cheng <yu-cheng.yu@...el.com> wrote:
>>
>> On 11/30/2020 10:26 AM, Nick Desaulniers wrote:
>>> (In response to https://lore.kernel.org/lkml/20201110162211.9207-2-yu-cheng.yu@intel.com/)
>>>
>>>> These need to be enabled to build a CET-enabled kernel, and Binutils v2.31
>>>> and GCC v8.1 or later are required to build a CET kernel.
>>>
>>> What about LLVM? Surely CrOS might be of interest to ship this on (we ship the
>>> equivalent for aarch64 on Android).
>>>
>>
>> I have not built with LLVM, but think it probably will work as well.  I
>> will test it.
>>
>>>> An application's CET capability is marked in its ELF header and can be
>>>> verified from the following command output, in the NT_GNU_PROPERTY_TYPE_0
>>>> field:
>>>>
>>>>       readelf -n <application> | grep SHSTK
>>>>           properties: x86 feature: IBT, SHSTK
>>>
>>> Same for llvm-readelf.
>>>
>>
>> I will add that to the document.
>>
>> Thanks,
>> Yu-cheng
> 
> The baseline LLVM version is 10.0.1, which is good enough for  clang
> -fcf-protection=full, llvm-readelf -n, LLD's .note.gnu.property
> handling (the LLD option is `-z force-ibt`, though)
> 
> 

Thanks!

Yu-cheng