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

Mike Rapoport
2021-02-22T10:25:44Z

On Mon, Feb 22, 2021 at 07:34:52AM +0000, Matthew Garrett wrote:
> On Mon, Feb 08, 2021 at 10:49:18AM +0200, Mike Rapoport wrote:
>
> > 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.
>
> Sorry for being a bit late to this - from the point of view of running
> processes (and even the kernel once resume is complete), hibernation is
> effectively equivalent to suspend to RAM. Why do they need to be handled
> differently here?

Hibernation leaves a copy of the data on the disk which we want to prevent.

--
Sincerely yours,
Mike.