[PATCH v9 12/25] security: Introduce file_post_open hook

[Christian Brauner]

On Mon, Jan 15, 2024 at 07:17:56PM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu at huawei.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 at huawei.com>
> Reviewed-by: Stefan Berger <stefanb at linux.ibm.com>
> Acked-by: Casey Schaufler <casey at schaufler-ca.com>
> Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>
> ---
>  fs/namei.c                    |  2 ++

Acked-by: Christian Brauner <brauner at kernel.org>