linux-kernel - Re: [PATCH v4 00/14] security: digest

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Date: Thu, 20 Jun 2024 10:48:36 -0400
From: Paul Moore <paul@...l-moore.com>
To: Roberto Sassu <roberto.sassu@...weicloud.com>
Cc: corbet@....net, jmorris@...ei.org, serge@...lyn.com, 
	akpm@...ux-foundation.org, shuah@...nel.org, mcoquelin.stm32@...il.com, 
	alexandre.torgue@...s.st.com, mic@...ikod.net, 
	linux-security-module@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	bpf@...r.kernel.org, zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, 
	linux-integrity@...r.kernel.org, wufan@...ux.microsoft.com, 
	pbrobinson@...il.com, zbyszek@...waw.pl, hch@....de, mjg59@...f.ucam.org, 
	pmatilai@...hat.com, jannh@...gle.com, dhowells@...hat.com, jikos@...nel.org, 
	mkoutny@...e.com, ppavlu@...e.com, petr.vorel@...il.com, mzerqung@...inter.de, 
	kgold@...ux.ibm.com, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v4 00/14] security: digest_cache LSM

On Thu, Jun 20, 2024 at 5:12 AM Roberto Sassu
<roberto.sassu@...weicloud.com> wrote:
> On Wed, 2024-06-19 at 14:43 -0400, Paul Moore wrote:
> > On Wed, Jun 19, 2024 at 12:38 PM Roberto Sassu
> > <roberto.sassu@...weicloud.com> wrote:
> > >
> > > Making it a kernel subsystem would likely mean replicating what the LSM
> > > infrastructure is doing, inode (security) blob and being notified about
> > > file/directory changes.
> >
> > Just because the LSM framework can be used for something, perhaps it
> > even makes the implementation easier, it doesn't mean the framework
> > should be used for everything.
>
> It is supporting 3 LSMs: IMA, IPE and BPF LSM.
>
> That makes it a clear target for the security subsystem, and as you
> suggested to start for IMA, if other kernel subsystems require them, we
> can make it as an independent subsystem.

Have you discussed the file digest cache functionality with either the
IPE or BPF LSM maintainers?  While digest_cache may support these
LSMs, I don't recall seeing any comments from the other LSM
developers; if you are going to advocate for this as something outside
of IMA, it would be good to see a show of support for the other LSMs.

-- 
paul-moore.com