Re: [TuxOnIce-devel] RFC: Suspend-to-ram cold boot protection by encrypting page cache

[Jeremy Maitin-Shepard]

Pavel Machek <pavel@xxxxxx> writes:

> On Wed 2009-07-08 03:47:53, Jeremy Maitin-Shepard wrote:
>> Pavel Machek <pavel@xxxxxx> writes:
>> 
>> [snip]
>> 
>> > I believe uswsusp could be used rather easily. Just modify s2disk to
>> > encrypt image in ram without writing it out, then decrypt it from ram
>> > and resume... it should be interesting hack.
>> 
>> As far as I understand, that would be completely useless since the image
>> that would be encrypted would just be a copy of what would still remain
>> in memory.

> Yes... so next step would be kernel call that would erase all the
> pagecache and anonymous pages. You would still leave some data in
> kernel structures, but that would be quite hard to fix. 

Okay.  (This does still require the same assumption as TuxOnIce
regarding the page cache, though.)

-- 
Jeremy Maitin-Shepard
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