Re: [PATCH v24 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory

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To: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Subject: Re: [PATCH v24 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory
From: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Date: Fri, 9 Apr 2021 18:10:10 +0300
Cc: 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@xxxxxxxxxx>, Balbir Singh <bsingharora@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Cyrill Gorcunov <gorcunov@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Eugene Syromiatnikov <esyr@xxxxxxxxxx>, 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>, Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, "Ravi V. Shankar" <ravi.v.shankar@xxxxxxxxx>, Vedvyas Shanbhogue <vedvyas.shanbhogue@xxxxxxxxx>, Dave Martin <Dave.Martin@xxxxxxx>, Weijiang Yang <weijiang.yang@xxxxxxxxx>, Pengfei Xu <pengfei.xu@xxxxxxxxx>, Haitao Huang <haitao.huang@xxxxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
In-reply-to: <20210401221104.31584-14-yu-cheng.yu@intel.com>
References: <20210401221104.31584-1-yu-cheng.yu@intel.com> <20210401221104.31584-14-yu-cheng.yu@intel.com>

On Thu, Apr 01, 2021 at 03:10:47PM -0700, Yu-cheng Yu wrote:
> A shadow stack PTE must be read-only and have _PAGE_DIRTY set.  However,
> read-only and Dirty PTEs also exist for copy-on-write (COW) pages.  These
> two cases are handled differently for page faults.  Introduce
> VM_SHADOW_STACK to track shadow stack VMAs.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
> Cc: Kees Cook <keescook@xxxxxxxxxxxx>

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

-- 
 Kirill A. Shutemov

References:
- [PATCH v24 00/30] Control-flow Enforcement: Shadow Stack
  - From: Yu-cheng Yu
- [PATCH v24 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory
  - From: Yu-cheng Yu

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