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Date: Fri, 16 Feb 2024 07:38:30 -0800
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Subject: Re: [RFC 0/8] PGP key parser using SandBox Mode
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To: Petr Tesarik <petrtesarik@huaweicloud.com>
Cc: =?UTF-8?B?UGV0ciBUZXNhxZnDrWs=?= <petr@tesarici.cz>,
 Jonathan Corbet <corbet@lwn.net>, Thomas Gleixner <tglx@linutronix.de>,
 Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
 Dave Hansen <dave.hansen@linux.intel.com>,
 "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
 "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>,
 Oleg Nesterov <oleg@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
 Xin Li <xin3.li@intel.com>, Arnd Bergmann <arnd@arndb.de>,
 Andrew Morton <akpm@linux-foundation.org>,
 Rick Edgecombe <rick.p.edgecombe@intel.com>,
 Kees Cook <keescook@chromium.org>,
 "Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
 Pengfei Xu <pengfei.xu@intel.com>, Josh Poimboeuf <jpoimboe@kernel.org>,
 Ze Gao <zegao2021@gmail.com>,
 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
 Kai Huang <kai.huang@intel.com>, David Woodhouse <dwmw@amazon.co.uk>,
 Brian Gerst <brgerst@gmail.com>, Jason Gunthorpe <jgg@ziepe.ca>,
 Joerg Roedel <jroedel@suse.de>, "Mike Rapoport (IBM)" <rppt@kernel.org>,
 Tina Zhang <tina.zhang@intel.com>, Jacob Pan
 <jacob.jun.pan@linux.intel.com>,
 "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
 open list <linux-kernel@vger.kernel.org>,
 Roberto Sassu <roberto.sassu@huaweicloud.com>,
 David Howells <dhowells@redhat.com>,
 Petr Tesarik <petr.tesarik1@huawei-partners.com>
References: <fb4a40c7-af9a-406a-95ab-406595f3ffe5@intel.com>
 <20240216152435.1575-1-petrtesarik@huaweicloud.com>
From: Dave Hansen <dave.hansen@intel.com>
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In-Reply-To: <20240216152435.1575-1-petrtesarik@huaweicloud.com>
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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.