Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack

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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>, Florian Weimer <fweimer@xxxxxxxxxx>, "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 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Date: Tue, 17 Jul 2018 16:15:10 -0700
In-reply-to: <1531868610.3541.21.camel@intel.com>
Openpgp: preference=signencrypt
References: <20180710222639.8241-1-yu-cheng.yu@intel.com> <20180710222639.8241-17-yu-cheng.yu@intel.com> <de510df6-7ea9-edc6-9c49-2f80f16472b4@linux.intel.com> <1531328731.15351.3.camel@intel.com> <45a85b01-e005-8cb6-af96-b23ce9b5fca7@linux.intel.com> <1531868610.3541.21.camel@intel.com>
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On 07/17/2018 04:03 PM, Yu-cheng Yu wrote:
> We need to find a way to differentiate "someone can write to this PTE"
> from "the write bit is set in this PTE".

Please think about this:

	Should pte_write() tell us whether PTE.W=1, or should it tell us
	that *something* can write to the PTE, which would include
	PTE.W=0/D=1?

Follow-Ups:
- Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Yu-cheng Yu

References:
- [RFC PATCH v2 00/27] Control Flow Enforcement (CET)
  - From: Yu-cheng Yu
- [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Yu-cheng Yu
- Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Dave Hansen
- Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Yu-cheng Yu
- Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Dave Hansen
- Re: [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for shadow stack
  - From: Yu-cheng Yu

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