linux-kernel - Re: [PATCH v23 22/28] x86/cet/shstk: User-mode shadow stack support

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Message-ID: <3144b030-0f90-717b-b373-2d0b346010c8@intel.com>
Date:   Fri, 19 Mar 2021 08:15:33 -0700
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Borislav Petkov <bp@...en8.de>
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>,
        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>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Haitao Huang <haitao.huang@...el.com>
Subject: Re: [PATCH v23 22/28] x86/cet/shstk: User-mode shadow stack support

On 3/19/2021 2:28 AM, Borislav Petkov wrote:
> On Thu, Mar 18, 2021 at 12:05:58PM -0700, Yu, Yu-cheng wrote:
>> Maybe I would add comments here.
> 
> Yap.
> 
> Also, looking forward in the set, I see prctl_set() and that is also
> done on current so should be ok.
> 
> In any case, yes, documenting the assumptions and expectations wrt
> current here is a good idea.
> 
>> If vm_munmap() returns -EINTR, mmap_lock is held by something else. That
>> lock should not be held forever.  For other types of error, the loop stops.
> 
> Ok I guess. The subsequent WARN_ON_ONCE() looks weird too but that
> should not fire, right? :)
> 
> Thx.
> 

That should not fire.

Yu-cheng