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

[Mike Rapoport]

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 <rppt@xxxxxxxxxxxxx>
> > 
> > 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.