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The restore of a task with shadow stack enabled adds these steps: * switch from the default shadow stack to a temporary shadow stack allocated in the premmaped area * unmap CRIU mappings; nothing changed here, but it's important that CRIU mappings can be removed only after switching to a temporary shadow stack * create shadow stack VMA with map_shadow_stack() * restore shadow stack contents with wrss * switch to "real" shadow stack * lock shadow stack features Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>