[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: new version of loop.c patch

Jari:

I am a bit confused as to what you mean with this message. What is "in place
encryption"? Your previous message says that loop-aes in fact does do
encrypted swap. Can you give us some information on how that might otherwise
work?


Very Respectfully,

Stuart Blake Tener, IT3, USNR-R, N3GWG
Beverly Hills, California
VTU 1904G (Volunteer Training Unit)
stuart@bh90210.net
west coast: (310)-358-0202 P.O. Box 16043, Beverly Hills, CA 90209-2043
east coast: (215)-338-6005 P.O. Box 45859, Philadelphia, PA 19149-5859

Telecopier: (419)-715-6073 fax to email gateway via www.efax.com (it's
free!)

JOIN THE US NAVY RESERVE, SERVE YOUR COUNTRY, AND BENEFIT FROM IT ALL.

Saturday, September 29, 2001 9:29 AM

-----Original Message-----
From: owner-linux-crypto@nl.linux.org
[mailto:owner-linux-crypto@nl.linux.org]On Behalf Of Jari Ruusu
Sent: Saturday, September 29, 2001 7:54 AM
To: Herbert Valerio Riedel
Cc: linux-crypto@nl.linux.org
Subject: Re: new version of loop.c patch

> Herbert Valerio Riedel wrote:
> On Sat, 2001-09-29 at 11:13, Herbert Valerio Riedel wrote:
>
> > another nice thing is, that the other 2.4.10 changes to loop.c allow us
> > to get rid of one buffer-allocate+copy-overhead, by the use of
> > LO_FLAGS_BH_REMAP, so we can use in-place encryption...
> >
> > now I've got only to audit the ciphers to check, whether they are safe
> > regarding in-place operation...
>
> ps: this should allow swap encryption over loop devices, without the need
> for pre-allocated buffers as worked around in loop-AES...
>
> jari, can you confirm this? :-)

In-place encryption won't work for swap-out path, sorry. VM often swaps out
something AND still wants to use original unmodified data.

I learned that the hard way!  :-)

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>


Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/


Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/