linux-kernel - Re: [PATCH v9 13/25] security: Introduce file

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Date: Mon, 15 Jan 2024 19:15:08 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Roberto Sassu <roberto.sassu@...weicloud.com>
Cc: brauner@...nel.org, 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>
Subject: Re: [PATCH v9 13/25] security: Introduce file_release hook

On Mon, Jan 15, 2024 at 07:17:57PM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the file_release hook.
> 
> IMA calculates at file close the new digest of the file content and writes
> it to security.ima, so that appraisal at next file access succeeds.
> 
> An LSM could implement an exclusive access scheme for files, only allowing
> access to files that have no references.

Elaborate that last part, please.