linux-kernel - Re: [PATCH v2 security-next 1/4] security: Hornet LSM

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Message-ID: <CAADnVQK7kyBso6bNEtNyC6zTBDuBv-K-c4a9KBVid+B405VX6Q@mail.gmail.com>
Date: Mon, 21 Apr 2025 16:48:42 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Paul Moore <paul@...l-moore.com>
Cc: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>, Jonathan Corbet <corbet@....net>, 
	David Howells <dhowells@...hat.com>, Herbert Xu <herbert@...dor.apana.org.au>, 
	"David S. Miller" <davem@...emloft.net>, James Morris <jmorris@...ei.org>, 
	"Serge E. Hallyn" <serge@...lyn.com>, Masahiro Yamada <masahiroy@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, Shuah Khan <shuah@...nel.org>, 
	Mickaël Salaün <mic@...ikod.net>, 
	Günther Noack <gnoack@...gle.com>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Jarkko Sakkinen <jarkko@...nel.org>, 
	Jan Stancek <jstancek@...hat.com>, Neal Gompa <neal@...pa.dev>, 
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	keyrings@...r.kernel.org, 
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>, 
	LSM List <linux-security-module@...r.kernel.org>, 
	Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>, 
	clang-built-linux <llvm@...ts.linux.dev>, nkapron@...gle.com, 
	Matteo Croce <teknoraver@...a.com>, Roberto Sassu <roberto.sassu@...wei.com>, 
	Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH v2 security-next 1/4] security: Hornet LSM

On Mon, Apr 21, 2025 at 3:04 PM Paul Moore <paul@...l-moore.com> wrote:
>
> On Mon, Apr 21, 2025 at 4:13 PM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> > On Wed, Apr 16, 2025 at 10:31 AM Blaise Boscaccy
> > <bboscaccy@...ux.microsoft.com> wrote:
> > >
> > > > Hacking into bpf internal objects like maps is not acceptable.
> > >
> > > We've heard your concerns about kern_sys_bpf and we agree that the LSM
> > > should not be calling it. The proposal in this email should meet both of
> > > our needs
> > > https://lore.kernel.org/bpf/874iypjl8t.fsf@microsoft.com/
>
> ...
>
> > Calling bpf_map_get() and
> > map->ops->map_lookup_elem() from a module is not ok either.
>
> A quick look uncovers code living under net/ which calls into these APIs.

and your point is ?

Again, Nack to hacking into bpf internals from LSM,
module or kernel subsystem.