# Re: \[PATCH v22 06/12\] fs,security: Add sb\_delete hook

- From: Jann Horn \<jannh@google.com\>
- Date: 2020-10-29 01:07:05 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2020/10/191441
- Thread: https://ratatoskr.run/linux-api/2020/10/191330/t.md

```text
On Tue, Oct 27, 2020 at 9:04 PM Mickaël Salaün [ref] wrote:
> The sb_delete security hook is called when shutting down a superblock,
> which may be useful to release kernel objects tied to the superblock's
> lifetime (e.g. inodes).
>
> This new hook is needed by Landlock to release (ephemerally) tagged
> struct inodes.  This comes from the unprivileged nature of Landlock
> described in the next commit.
>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: James Morris <jmorris@namei.org>
> Cc: Jann Horn <jannh@google.com>
> Cc: Kees Cook <redacted>
> Cc: Serge E. Hallyn <serge@hallyn.com>
> Signed-off-by: Mickaël Salaün <redacted>

Reviewed-by: Jann Horn <jannh@google.com>
```