linux-kernel - Re: [PATCH v15 00/26] Control-flow Enforcement: Shadow Stack

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Message-ID: <60d3c72c-b85f-88ac-c79b-1340445bb228@intel.com>
Date:   Sat, 28 Nov 2020 08:31:02 -0800
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Balbir Singh <bsingharora@...il.com>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>,
        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>,
        Pengfei Xu <pengfei.xu@...el.com>
Subject: Re: [PATCH v15 00/26] Control-flow Enforcement: Shadow Stack

On 11/27/2020 1:29 AM, Balbir Singh wrote:
> On Tue, Nov 10, 2020 at 08:21:45AM -0800, Yu-cheng Yu wrote:
>> Control-flow Enforcement (CET) is a new Intel processor feature that blocks
>> return/jump-oriented programming attacks.  Details are in "Intel 64 and
>> IA-32 Architectures Software Developer's Manual" [1].
>>
>> CET can protect applications and the kernel.  This series enables only
>> application-level protection, and has three parts:
>>
>>    - Shadow stack [2],
>>    - Indirect branch tracking [3], and
>>    - Selftests [4].
>>
>> I have run tests on these patches for quite some time, and they have been
>> very stable.  Linux distributions with CET are available now, and Intel
>> processors with CET are becoming available.  It would be nice if CET
>> support can be accepted into the kernel.  I will be working to address any
>> issues should they come up.
>>
> 
> Is there a way to run these patches for testing? Bochs emulation or anything
> else? I presume you've been testing against violations of CET in user space?
> Can you share your testing?
>   
> Balbir Singh.
> 

Machines with CET are already available on the market.  I tested these 
on real machines with Fedora.  There is a quick test in my earlier 
selftest patches:

https://lore.kernel.org/linux-api/20200521211720.20236-6-yu-cheng.yu@intel.com/

Thanks,
Yu-cheng