Messages in this thread | | | Date | Tue, 28 Jul 2015 16:48:12 +0200 | From | Pali Rohár <> | Subject | Re: [PATCH v2 3/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation |
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On Tuesday 28 July 2015 16:44:19 Pavel Machek wrote: > On Sun 2015-06-21 13:20:34, Pali Rohár wrote: > > This patch adds dm message commands and option strings to optionally wipe key > > from dm-crypt device before entering suspend or hibernate state. > > > > Before key is wiped dm device must be suspended. To prevent race conditions with > > I/O and userspace processes, wiping action must be called after processes are > > freezed. Otherwise userspace processes could start reading/writing to disk after > > dm device is suspened and freezing processes before suspend/hibernate action > > will fail. > > Are you sure this is enough? > > We still may need to allocate memory after userspace is frozen, and > that could mean writing dirty buffers out to make some memory free... > > Pavel >
Hm... good question. Maybe it is needed to also flush all buffers?
-- Pali Rohár pali.rohar@gmail.com
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