linux-kernel - Re: [PATCH v9 12/25] security: Introduce file_post

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Message-ID: <20240209-kunterbunt-abgefackelt-04b54394da2a@brauner>
Date: Fri, 9 Feb 2024 10:59:42 +0100
From: Christian Brauner <brauner@...nel.org>
To: Roberto Sassu <roberto.sassu@...weicloud.com>
Cc: viro@...iv.linux.org.uk, chuck.lever@...cle.com, jlayton@...nel.org, 
	neilb@...e.de, kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com, 
	paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com, 
	dmitry.kasatkin@...il.com, eric.snowberg@...cle.com, dhowells@...hat.com, jarkko@...nel.org, 
	stephen.smalley.work@...il.com, eparis@...isplace.org, casey@...aufler-ca.com, shuah@...nel.org, 
	mic@...ikod.net, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-nfs@...r.kernel.org, linux-security-module@...r.kernel.org, 
	linux-integrity@...r.kernel.org, keyrings@...r.kernel.org, selinux@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>, 
	Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v9 12/25] security: Introduce file_post_open hook

On Fri, Feb 09, 2024 at 10:56:33AM +0100, Christian Brauner wrote:
> On Mon, Jan 15, 2024 at 07:17:56PM +0100, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@...wei.com>
> > 
> > In preparation to move IMA and EVM to the LSM infrastructure, introduce the
> > file_post_open hook. Also, export security_file_post_open() for NFS.
> > 
> > Based on policy, IMA calculates the digest of the file content and
> > extends the TPM with the digest, verifies the file's integrity based on
> > the digest, and/or includes the file digest in the audit log.
> > 
> > LSMs could similarly take action depending on the file content and the
> > access mask requested with open().
> > 
> > The new hook returns a value and can cause the open to be aborted.
> > 
> > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> > Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> > Acked-by: Casey Schaufler <casey@...aufler-ca.com>
> > Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
> > ---
> >  fs/namei.c                    |  2 ++
> 
> Acked-by: Christian Brauner <brauner@...nel.org>

Redacting that. I have a question.