linux-kernel - Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack

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Message-ID: <47a73ab7-20c9-f7bb-14b0-ba81e33fa1ad@intel.com>
Date:   Thu, 26 Aug 2021 10:33:03 -0700
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Borislav Petkov <bp@...en8.de>, "H.J. Lu" <hjl.tools@...il.com>
CC:     the arch/x86 maintainers <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>,
        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>,
        "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>,
        "Dave Martin" <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Haitao Huang <haitao.huang@...el.com>,
        Rick P Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack

On 8/26/2021 10:28 AM, Borislav Petkov wrote:
> On Thu, Aug 26, 2021 at 10:22:29AM -0700, H.J. Lu wrote:
>>>> +     /*
>>>> +      * Earlier clone() does not pass stack_size.  Use RLIMIT_STACK and
>>>
>>> What is "earlier clone()"?
>>
>> clone() doesn't have stack size info which was added to clone3().
> 
> /me goes and reads the manpage...
> 
>     clone3()
>         The  clone3()  system call provides a superset of the functionality of the older
>         clone() interface.  It also provides a number of  API  improvements,  including:
>         space  for additional flags bits; cleaner separation in the use of various argu‐
>         ments; and the ability to specify the size of the child's stack area.
> 
> Aha, Yu-cheng, pls use those words to make your comment understandable.
> 
> Thx.
> 

Sure!

Yu-cheng