Re: [PATCH v19 20/25] x86/cet/shstk: User-mode shadow stack support

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To: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Subject: Re: [PATCH v19 20/25] x86/cet/shstk: User-mode shadow stack support
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Thu, 4 Feb 2021 12:29:56 -0800
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>, 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>
In-reply-to: <20210203225547.32221-21-yu-cheng.yu@intel.com>
References: <20210203225547.32221-1-yu-cheng.yu@intel.com> <20210203225547.32221-21-yu-cheng.yu@intel.com>

On Wed, Feb 03, 2021 at 02:55:42PM -0800, Yu-cheng Yu wrote:
> Introduce basic shadow stack enabling/disabling/allocation routines.
> A task's shadow stack is allocated from memory with VM_SHSTK flag and has
> a fixed size of min(RLIMIT_STACK, 4GB).
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook

References:
- [PATCH v19 00/25] Control-flow Enforcement: Shadow Stack
  - From: Yu-cheng Yu
- [PATCH v19 20/25] x86/cet/shstk: User-mode shadow stack support
  - From: Yu-cheng Yu

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