Re: [RFC PATCH v2 27/27] x86/cet: Add arch_prctl functions for CET

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To: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-api@xxxxxxxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Balbir Singh <bsingharora@xxxxxxxxx>, Cyrill Gorcunov <gorcunov@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H.J. Lu" <hjl.tools@xxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Mike Kravetz <mike.kravetz@xxxxxxxxxx>, Nadav Amit <nadav.amit@xxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Ravi V. Shankar" <ravi.v.shankar@xxxxxxxxx>, Vedvyas Shanbhogue <vedvyas.shanbhogue@xxxxxxxxx>
Subject: Re: [RFC PATCH v2 27/27] x86/cet: Add arch_prctl functions for CET
From: Florian Weimer <fweimer@xxxxxxxxxx>
Date: Wed, 11 Jul 2018 14:19:43 +0200
In-reply-to: <20180710222639.8241-28-yu-cheng.yu@intel.com>
References: <20180710222639.8241-1-yu-cheng.yu@intel.com> <20180710222639.8241-28-yu-cheng.yu@intel.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 07/11/2018 12:26 AM, Yu-cheng Yu wrote:

arch_prctl(ARCH_CET_DISABLE, unsigned long features)
     Disable SHSTK and/or IBT specified in 'features'.  Return -EPERM
     if CET is locked out.

arch_prctl(ARCH_CET_LOCK)
     Lock out CET feature.


Isn't it a “lock in” rather than a “lock out”?

Thanks,
Florian

Follow-Ups:
- Re: [RFC PATCH v2 27/27] x86/cet: Add arch_prctl functions for CET
  - From: Yu-cheng Yu

References:
- [RFC PATCH v2 00/27] Control Flow Enforcement (CET)
  - From: Yu-cheng Yu
- [RFC PATCH v2 27/27] x86/cet: Add arch_prctl functions for CET
  - From: Yu-cheng Yu

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