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@huawei.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.