linux-kernel - Re: [RFC 0/8] PGP key parser using SandBox Mode

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Date: Fri, 16 Feb 2024 07:38:30 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Petr Tesarik <petrtesarik@...weicloud.com>
Cc: Petr Tesařík <petr@...arici.cz>,
 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>,
 David Howells <dhowells@...hat.com>,
 Petr Tesarik <petr.tesarik1@...wei-partners.com>
Subject: Re: [RFC 0/8] PGP key parser using SandBox Mode

On 2/16/24 07:24, Petr Tesarik wrote:
> While I started working on my development branch to illustrate how
> SandBox Mode could be enhanced to allow dynamic memory allocation and
> other features necessary to convert some existing code, my colleague
> Roberto Sassu set out and adapted a PGP key parser to run in a sandbox.
> 
> Disclaimer:
> 
> The code had to be rearranged in order to avoid memory allocations
> and crypto operations in the sandbox. The code might contain errors.

I'm confused by this.  The kernel doesn't (appear to) have a PGP parser
today.  So are you saying that it *should* have one and it's only
feasible if its confined in a sandbox?

A much more powerful example would be to take something that the kernel
has already and put it in a sandbox.  That would show us how difficult
it is to sandbox something versus just doing it _normally_ in the kernel.

As it stands, I fear this was just the largest chunk of sandbox code
that was laying around and it seemed like a good idea to just chuck
~1400 lines of code over the wall at a huge cc list.

I'm not sure I want to see any more SandBox mode filling up my inbox.