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

- From: Michal Hocko \<mhocko@suse.com\>
- Date: 2021-02-08 10:56:18 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/02/199495
- Thread: https://ratatoskr.run/linux-api/2021/02/199471/t.md

```text
On Mon 08-02-21 11:32:11, David Hildenbrand wrote:
> On 08.02.21 11:18, 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?
> > 
> 
> Why should unevictable memory not go to swap when hibernating? We're merely
> dumping all of our system RAM (including any unmovable allocations) to swap
> storage and the system is essentially completely halted.
> 
My understanding is that mlock is never really made visible via swap
storage.
-- 
Michal Hocko
SUSE Labs

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