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

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Message-ID: <34B19756-91D3-4DA1-BE76-BD3122C16E95@zytor.com>
Date: Wed, 14 Feb 2024 07:28:35 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Dave Hansen <dave.hansen@...el.com>,
        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>,
        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>
CC: Roberto Sassu <roberto.sassu@...weicloud.com>, petr@...arici.cz,
        Petr Tesarik <petr.tesarik1@...wei-partners.com>
Subject: Re: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

On February 14, 2024 6:52:53 AM PST, 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?

Seriously. On the surface it looks like a really bad idea – basically an ad hoc, *more* privileged version of user shave.