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

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Message-ID: <87y1bktjdk.fsf@meer.lwn.net>
Date: Fri, 16 Feb 2024 10:21:43 -0700
From: Jonathan Corbet <corbet@....net>
To: Petr Tesařík <petr@...arici.cz>, Dave Hansen
 <dave.hansen@...el.com>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>, 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

Petr Tesařík <petr@...arici.cz> writes:

> On Fri, 16 Feb 2024 07:38:30 -0800
> Dave Hansen <dave.hansen@...el.com> wrote:
>> 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?
>
> I'm sorry if this is confusing. Yes, your understanding is correct.
> This patch series demonstrates that SBM (even in the initial version
> that was submitted) allows to write a PGP parser which can survive
> memory safety bugs withoug compromising the rest of the kernel.

So I have a different question: some years ago we added the "usermode
blob" feature for just this kind of use case - parsing firewall rules at
the time.  It has never been used for that, but it's still there in
kernel/usermode_driver.c.  Is there a reason why this existing
functionality can't be used for tasks like PGP parsing as well?

Thanks,

jon