[PATCH v9 10/25] security: Introduce inode_post_setattr hook

[Christian Brauner]

On Mon, Jan 15, 2024 at 07:17:54PM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu at huawei.com>
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the inode_post_setattr hook.
> 
> At inode_setattr hook, EVM verifies the file's existing HMAC value. At
> inode_post_setattr, EVM re-calculates the file's HMAC based on the modified
> file attributes and other file metadata.
> 
> Other LSMs could similarly take some action after successful file attribute
> change.
> 
> The new hook cannot return an error and cannot cause the operation to be
> reverted.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
> Reviewed-by: Stefan Berger <stefanb at linux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>
> Acked-by: Casey Schaufler <casey at schaufler-ca.com>
> ---
>  fs/attr.c                     |  1 +

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