# Re: \[PATCH v17 08/10\] PM: hibernate: disable when there are active secretmem users

- From: Mike Rapoport \<rppt@kernel.org\>
- Date: 2021-02-08 21:30:51 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2021/02/199544
- Thread: https://ratatoskr.run/linux-api/2021/02/199471/t.md

```text
On Mon, Feb 08, 2021 at 11:18:37AM +0100, Michal Hocko wrote:
> On Mon 08-02-21 10:49:18, Mike Rapoport wrote:
> > From: Mike Rapoport <redacted>
> > 
> > It is unsafe to allow saving of secretmem areas to the hibernation
> > snapshot as they would be visible after the resume and this essentially
> > will defeat the purpose of secret memory mappings.
> > 
> > Prevent hibernation whenever there are active secret memory users.
> 
> Does this feature need any special handling? As it is effectivelly
> unevictable memory then it should behave the same as other mlock, ramfs
> which should already disable hibernation as those cannot be swapped out,
> no?

As David already said, hibernation does not care about mlocked memory, so
this feature requires a special handling.

-- 
Sincerely yours,
Mike.
```