linux-kernel - Re: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

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Date: Wed, 14 Feb 2024 10:52:47 -0800
From: Xin Li <xin@...or.com>
To: Petr Tesařík <petr@...arici.cz>,
        Dave Hansen <dave.hansen@...el.com>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>,
        Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
        Xin Li <xin3.li@...el.com>, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Kees Cook <keescook@...omium.org>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>, Ze Gao <zegao2021@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>, David Woodhouse <dwmw@...zon.co.uk>,
        Brian Gerst <brgerst@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Joerg Roedel <jroedel@...e.de>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Tina Zhang <tina.zhang@...el.com>,
        Jacob Pan
 <jacob.jun.pan@...ux.intel.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...weicloud.com>,
        Petr Tesarik <petr.tesarik1@...wei-partners.com>
Subject: Re: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

On 2/14/2024 10:22 AM, Petr Tesařík wrote:
> On Wed, 14 Feb 2024 06:52:53 -0800
> Dave Hansen <dave.hansen@...el.com> wrote:
> 
>> On 2/14/24 03:35, Petr Tesarik wrote:
>>> This patch series implements x86_64 arch hooks for the generic SandBox
>>> Mode infrastructure.
>>
>> I think I'm missing a bit of context here.  What does one _do_ with
>> SandBox Mode?  Why is it useful?
> 
> I see, I split the patch series into the base infrastructure and the
> x86_64 implementation, but I forgot to merge the two recipient lists.
> :-(
> 
> Anyway, in the long term I would like to work on gradual decomposition
> of the kernel into a core part and many self-contained components.
> Sandbox mode is a useful tool to enforce isolation.
> 
> In its current form, sandbox mode is too limited for that, but I'm
> trying to find some balance between "publish early" and reaching a
> feature level where some concrete examples can be shown. I'd rather
> fail fast than maintain hundreds of patches in an out-of-tree branch
> before submitting (and failing anyway).
> 
> Petr T
> 

What you're proposing sounds a gigantic thing, which could potentially
impact all subsystems.  Unless you prove it has big advantages with real
world usages, I guess nobody even wants to look into the patches.

BTW, this seems another attempt to get the idea of micro-kernel into
Linux.

-- 
Thanks!
     Xin