Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges

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To: Dave Hansen <dave.hansen@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>, 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>
Subject: Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges
From: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Date: Wed, 14 Aug 2019 09:20:21 -0700
In-reply-to: <5ba3d1b3-5587-e7dd-b9de-9a954172d31f@intel.com>
References: <20190813205225.12032-1-yu-cheng.yu@intel.com> <20190813205225.12032-10-yu-cheng.yu@intel.com> <5ba3d1b3-5587-e7dd-b9de-9a954172d31f@intel.com>

On Tue, 2019-08-13 at 15:34 -0700, Dave Hansen wrote:
> On 8/13/19 1:52 PM, Yu-cheng Yu wrote:
> > To prevent function call/return spills into the next shadow stack
> > area, do not merge shadow stack areas.
> 
> How does this prevent call/return spills?

It does not.  I will fix the description.

Yu-cheng

References:
- [PATCH v8 00/27] Control-flow Enforcement: Shadow Stack
  - From: Yu-cheng Yu
- [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges
  - From: Yu-cheng Yu
- Re: [PATCH v8 09/27] mm/mmap: Prevent Shadow Stack VMA merges
  - From: Dave Hansen

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