linux-kernel - Re: [PATCH v8 18/40] mm: Introduce VM_SHADOW

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Message-ID: <a7176b88-98ac-75b7-2de3-a85b342401ef@redhat.com>
Date:   Mon, 20 Mar 2023 11:55:58 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H . J . Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Weijiang Yang <weijiang.yang@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        John Allen <john.allen@....com>, kcc@...gle.com,
        eranian@...gle.com, rppt@...nel.org, jamorris@...ux.microsoft.com,
        dethoma@...rosoft.com, akpm@...ux-foundation.org,
        Andrew.Cooper3@...rix.com, christina.schimpe@...el.com,
        debug@...osinc.com, szabolcs.nagy@....com
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [PATCH v8 18/40] mm: Introduce VM_SHADOW_STACK for shadow stack
 memory

On 19.03.23 01:15, Rick Edgecombe wrote:
> From: Yu-cheng Yu <yu-cheng.yu@...el.com>
> 
> New hardware extensions implement support for shadow stack memory, such
> as x86 Control-flow Enforcement Technology (CET). Add a new VM flag to
> identify these areas, for example, to be used to properly indicate shadow
> stack PTEs to the hardware.
> 
> Shadow stack VMA creation will be tightly controlled and limited to
> anonymous memory to make the implementation simpler and since that is all
> that is required. The solution will rely on pte_mkwrite() to create the
> shadow stack PTEs, so it will not be required for vm_get_page_prot() to
> learn how to create shadow stack memory. For this reason document that
> VM_SHADOW_STACK should not be mixed with VM_SHARED.
> 
> Co-developed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>
> Tested-by: Pengfei Xu <pengfei.xu@...el.com>
> Tested-by: John Allen <john.allen@....com>
> Tested-by: Kees Cook <keescook@...omium.org>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb