* add IV generation method null
@ 2007-02-16 14:21 Ludwig Nussel
2007-02-28 14:47 ` Ludwig Nussel
0 siblings, 1 reply; 4+ messages in thread
From: Ludwig Nussel @ 2007-02-16 14:21 UTC (permalink / raw)
To: Alasdair G Kergon; +Cc: device-mapper development, Christophe Saout
Hi,
Following patch (against SUSE's 2.6.18) adds the IV generation
method 'null' to be able to read old filesystem images created with
SuSE's loop_fish2 module.
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Acked-By: Christophe Saout <christophe@saout.de>
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -103,6 +103,8 @@ static kmem_cache_t *_crypt_io_pool;
* encrypted with the bulk cipher using a salt as key. The salt
* should be derived from the bulk cipher's key via hashing.
*
+ * null: For mounting legacy images only.
+ *
* plumb: unimplemented, see:
* http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
*/
@@ -203,6 +205,13 @@ static int crypt_iv_essiv_gen(struct cry
return 0;
}
+static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+{
+ memset(iv, 0, cc->iv_size);
+
+ return 0;
+}
+
static struct crypt_iv_operations crypt_iv_plain_ops = {
.generator = crypt_iv_plain_gen
};
@@ -213,6 +222,9 @@ static struct crypt_iv_operations crypt_
.generator = crypt_iv_essiv_gen
};
+static struct crypt_iv_operations crypt_iv_null_ops = {
+ .generator = crypt_iv_null_gen
+};
static int
crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
@@ -594,6 +606,8 @@ static int crypt_ctr(struct dm_target *t
cc->iv_gen_ops = &crypt_iv_plain_ops;
else if (strcmp(ivmode, "essiv") == 0)
cc->iv_gen_ops = &crypt_iv_essiv_ops;
+ else if (strcmp(ivmode, "null") == 0)
+ cc->iv_gen_ops = &crypt_iv_null_ops;
else {
ti->error = "Invalid IV mode";
goto bad2;
cu
Ludwig
--
(o_ Ludwig Nussel
//\ SUSE Labs
V_/_ http://www.suse.de/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: add IV generation method null
2007-02-16 14:21 add IV generation method null Ludwig Nussel
@ 2007-02-28 14:47 ` Ludwig Nussel
2007-03-01 14:41 ` Alasdair G Kergon
0 siblings, 1 reply; 4+ messages in thread
From: Ludwig Nussel @ 2007-02-28 14:47 UTC (permalink / raw)
To: dm-devel
Ludwig Nussel wrote:
> Following patch (against SUSE's 2.6.18) adds the IV generation
> method 'null' to be able to read old filesystem images created with
> SuSE's loop_fish2 module.
Any comments/objections on the patch? Is there any additional action
from my side required to get this into the mainline kernel?
cu
Ludwig
--
(o_ Ludwig Nussel
//\ SUSE Labs
V_/_ http://www.suse.de/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: add IV generation method null
2007-02-28 14:47 ` Ludwig Nussel
@ 2007-03-01 14:41 ` Alasdair G Kergon
2007-03-01 15:16 ` Ludwig Nussel
0 siblings, 1 reply; 4+ messages in thread
From: Alasdair G Kergon @ 2007-03-01 14:41 UTC (permalink / raw)
To: dm-devel
On Wed, Feb 28, 2007 at 03:47:54PM +0100, Ludwig Nussel wrote:
> Any comments/objections on the patch? Is there any additional action
> from my side required to get this into the mainline kernel?
This comment ought to be more descriptive:
null: For mounting legacy images only.
I'll include it in the next set of patches I send upstream.
Alasdair
--
agk@redhat.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: add IV generation method null
2007-03-01 14:41 ` Alasdair G Kergon
@ 2007-03-01 15:16 ` Ludwig Nussel
0 siblings, 0 replies; 4+ messages in thread
From: Ludwig Nussel @ 2007-03-01 15:16 UTC (permalink / raw)
To: dm-devel
Alasdair G Kergon wrote:
> On Wed, Feb 28, 2007 at 03:47:54PM +0100, Ludwig Nussel wrote:
> > Any comments/objections on the patch? Is there any additional action
> > from my side required to get this into the mainline kernel?
>
> This comment ought to be more descriptive:
>
> null: For mounting legacy images only.
Ok, patch with better comment included.
> I'll include it in the next set of patches I send upstream.
Thanks! :-)
Add IV generation method 'null' to be able to read old filesystem
images created with SuSE's loop_fish2 module.
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Acked-By: Christophe Saout <christophe@saout.de>
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -103,6 +103,10 @@ static kmem_cache_t *_crypt_io_pool;
* encrypted with the bulk cipher using a salt as key. The salt
* should be derived from the bulk cipher's key via hashing.
*
+ * null: the initial vector is always zero. This method is for
+ * compatability with SuSE's obsolete loop_fish2 only. Do not
+ * use it for creating new content.
+ *
* plumb: unimplemented, see:
* http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
*/
@@ -203,6 +207,13 @@ static int crypt_iv_essiv_gen(struct cry
return 0;
}
+static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+{
+ memset(iv, 0, cc->iv_size);
+
+ return 0;
+}
+
static struct crypt_iv_operations crypt_iv_plain_ops = {
.generator = crypt_iv_plain_gen
};
@@ -213,6 +224,9 @@ static struct crypt_iv_operations crypt_
.generator = crypt_iv_essiv_gen
};
+static struct crypt_iv_operations crypt_iv_null_ops = {
+ .generator = crypt_iv_null_gen
+};
static int
crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
@@ -594,6 +608,8 @@ static int crypt_ctr(struct dm_target *t
cc->iv_gen_ops = &crypt_iv_plain_ops;
else if (strcmp(ivmode, "essiv") == 0)
cc->iv_gen_ops = &crypt_iv_essiv_ops;
+ else if (strcmp(ivmode, "null") == 0)
+ cc->iv_gen_ops = &crypt_iv_null_ops;
else {
ti->error = "Invalid IV mode";
goto bad2;
cu
Ludwig
--
(o_ Ludwig Nussel
//\ SUSE Labs
V_/_ http://www.suse.de/
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-03-01 15:16 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-02-16 14:21 add IV generation method null Ludwig Nussel
2007-02-28 14:47 ` Ludwig Nussel
2007-03-01 14:41 ` Alasdair G Kergon
2007-03-01 15:16 ` Ludwig Nussel
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