linux-kernel - Re: [NEEDS-REVIEW] Re: [PATCH v11 25/25] x86/cet/shstk: Add arch

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Date:   Tue, 15 Sep 2020 12:24:06 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Dave Martin <Dave.Martin@....com>, "H.J. Lu" <hjl.tools@...il.com>,
        Florian Weimer <fweimer@...hat.com>, 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>,
        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>,
        Weijiang Yang <weijiang.yang@...el.com>
Subject: Re: [NEEDS-REVIEW] Re: [PATCH v11 25/25] x86/cet/shstk: Add
 arch_prctl functions for shadow stack

On 9/15/20 12:08 PM, Yu-cheng Yu wrote:
> On Mon, 2020-09-14 at 17:12 -0700, Yu, Yu-cheng wrote:
>> On 9/14/2020 7:50 AM, Dave Hansen wrote:
>>> On 9/11/20 3:59 PM, Yu-cheng Yu wrote:
>>> ...
>>>> Here are the changes if we take the mprotect(PROT_SHSTK) approach.
>>>> Any comments/suggestions?
>>> I still don't like it. :)
>>>
>>> I'll also be much happier when there's a proper changelog to accompany
>>> this which also spells out the alternatives any why they suck so much.
> [...]
> 
> I revised it.  If this turns out needing more work/discussion, we can split it
> out from the shadow stack series.

Where does that leave things?  You only get shadow stacks for
single-threaded apps which have the ELF bits set?