Re: The disappearing sys_call_table export.

[Ahmed Masud]

Yoav Weiss wrote:

> Masud wrote:
> 
> 
>>But isn't swap crypting fun ? :-) Running encrypted swap is okay so long
>>as we throw away the key after each session.  This can be easily (famous
>>last words) achieved under crypto kernels. I am not certain if such
>>functionaility is being contemplated for the Linux kernel along with the
>>new cryptoloop stuff, if there isn't i can volunteer to put something
>>like that in - if we are interested. Are we?
> 
> 
> See http://loop-aes.sourceforge.net/
> The README already explains how to use it as encrypted swap.  I've been
> using it for quite a while without problems.
> 
I am familiar with Jari's cryptoloop and related tools and have studied 
and am using them for some applications on a few environments.

> If you feel like volunteering for an encrypted swap, I suggest the model
> used by OpenBSD.  Instead of using an encrypted swap dev with one random
> key, they seem to have a per-process key and encrypt swap areas of the
> process with its key.  When a process dies, its key dies with it, so the
> swap space it used is considered clean without having to wait for an
> override or a reboot.
> 

This definitely sounds very interesting.  I can start looking at this 
problem seriously and see if i can put something together for 2.5.x 
since crypto subsystem routines are largely in place.

> Another fun project is encrypted hibernation (suspend-to-disk).  Once the
> kernel contains a stable hibernation option, I'm certainly going to
> encrypt it.
> 

Yes that too could be a fun thing to do.

Ahmed