Re: [PATCH v9 16/25] security: Introduce inode_post_set_acl hook

[Christian Brauner]

On Mon, Jan 15, 2024 at 07:18:00PM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the inode_post_set_acl hook.
> 
> At inode_set_acl hook, EVM verifies the file's existing HMAC value. At
> inode_post_set_acl, EVM re-calculates the file's HMAC based on the modified
> POSIX ACL and other file metadata.
> 
> Other LSMs could similarly take some action after successful POSIX ACL
> change.
> 
> The new hook cannot return an error and cannot cause the operation to be
> reverted.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> Acked-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> Reviewed-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
> ---
>  fs/posix_acl.c                |  1 +

Acked-by: Christian Brauner <brauner@xxxxxxxxxx>