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

[PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 01/10] mm: add definition of PMD_PAGE_ORDER · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 02/10] mmap: make mlock_future_check() global · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 03/10] riscv/Kconfig: make direct map manipulation options depend on MMU · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 04/10] set_memory: allow set_direct_map_*_noflush() for multiple pages · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 06/10] arm64: kfence: fix header inclusion · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 05/10] set_memory: allow querying whether set_direct_map_*() is actually enabled · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Matthew Garrett <mjg59@srcf.ucam.org> · 2021-02-22
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Mike Rapoport <rppt@kernel.org> · 2021-02-22
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Matthew Garrett <mjg59@srcf.ucam.org> · 2021-02-22
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · Dan Williams <hidden> · 2021-02-22
Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users · James Bottomley <hidden> · 2021-02-22
[PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-08
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <hidden> · 2021-02-09
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-12
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-14
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-14
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · James Bottomley <hidden> · 2021-02-14
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-15
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · James Bottomley <hidden> · 2021-02-15
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-15
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · James Bottomley <hidden> · 2021-02-16
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-16
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · James Bottomley <hidden> · 2021-02-16
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-16
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · James Bottomley <hidden> · 2021-02-17
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-22
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-22
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-16
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-11
Re: [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-12
[PATCH v17 09/10] arch, mm: wire up memfd_secret system call where relevant · Mike Rapoport <rppt@kernel.org> · 2021-02-08
[PATCH v17 10/10] secretmem: test: add basic selftest for memfd_secret(2) · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Mike Rapoport <rppt@kernel.org> · 2021-02-08
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-08
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · David Hildenbrand <hidden> · 2021-02-09
Re: [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas · Michal Hocko <mhocko@suse.com> · 2021-02-09

From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: 2021-02-22 07:46:33
Also in: linux-arch, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml, nvdimm

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?

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