[dm-devel] [PATCH v2 3/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation

[Pali Rohár]

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 at gmail.com