mirror of
https://gitlab.gnome.org/GNOME/gparted
synced 2024-08-27 19:50:23 +00:00
317e444056
Also load the starting offset and length of the active dm-crypt mapping
into the LUKS_Info module from the dmsetup output. This provides the
location and size of the encrypted data within the underlying block
device.
Note that dmsetup reports in units of 512 bytes sectors [1], the GParted
LUKS_Info module uses bytes and GParted Partition objects work in device
sector size units. However the actual sector size of a dm-crypt mapping
[2] is the same as that of the underlying block device [3].
# modprobe scsi_debug dev_size_mb=128 sector_size=4096
# fgrep scsi_debug /sys/block/*/device/model
/sys/block/sdd/device/model:scsi_debug
# parted /dev/sde print
Error: /dev/sde: unrecognised disk label
Model: Linux scsi_debug (scsi)
Disk /dev/sde: 134MB
[3] Sector size (logical/physical): 4096B/4096B
Partition Table: unknown
# cryptsetup luksFormat /dev/sde
# cryptsetup luksOpen /dev/sde sde_crypt
# parted /dev/mapper/sde_crypt print
Error: /dev/mapper/sde_crypt: unrecognised disk label
Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/sde_crypt: 132MB
[2] Sector size (logical/physical): 4096B/4096B
Partition Table: unknown
# cryptsetup status sde_crypt
/dev/mapper/sde_crypt is active.
type: LUKS1
cipher: aes-cbc-essiv:sha256
keysize: 256 bits
device: /dev/sde
offset: 4096 sectors
size: 258048 sectors
mode: read/write
# dmsetup table --target crypt
...
sde_crypt: 0 258048 crypt aes-cbc-essiv:sha256 0000000000000000000000000000000000000000000000000000000000000000 0 8:64 4096
[1] Both cryptsetup and dmsetup report the offset as 4096 and the size/
length as 258048. 128 MiB / (4096+258048) = 512 byte units, even on a
4096 byte sector size device.
Update debugging of LUKS to this:
# ./gpartedbin
======================
libparted : 2.4
======================
DEBUG: /dev/sdb5: LUKS closed
DEBUG: /dev/sdb6: LUKS open mapping /dev/mapper/sdb6_crypt, offset=2097152, length=534773760
/dev/sde: unrecognised disk label
DEBUG: /dev/sde: LUKS open mapping /dev/mapper/sde_crypt, offset=2097152, length=132120576
Bug 760080 - Implement read-only LUKS support
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/* Copyright (C) 2015 Mike Fleetwood
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
/* LUKS_Info
|
|
*
|
|
* Cache of active Linux kernel Device-mapper encryption mappings.
|
|
* (Named LUKS because only encryption using the LUKS on disk format is
|
|
* recognised and handled).
|
|
*/
|
|
|
|
#ifndef GPARTED_LUKS_INFO_H
|
|
#define GPARTED_LUKS_INFO_H
|
|
|
|
#include "../include/Utils.h"
|
|
|
|
#include <glibmm/ustring.h>
|
|
#include <vector>
|
|
|
|
namespace GParted
|
|
{
|
|
|
|
struct LUKS_Mapping
|
|
{
|
|
Glib::ustring name; // Name of the dm-crypt mapping
|
|
unsigned long major; // Major device number of the underlying block device
|
|
unsigned long minor; // Minor device number of the underlying block device
|
|
Glib::ustring path; // Path of the underlying block device
|
|
Byte_Value offset; // Offset to the start of the mapping in the underlying block device
|
|
Byte_Value length; // Length of the mapping in the underlying block device
|
|
};
|
|
|
|
class LUKS_Info
|
|
{
|
|
public:
|
|
static void load_cache();
|
|
static const LUKS_Mapping & get_cache_entry( const Glib::ustring & path );
|
|
|
|
private:
|
|
static std::vector<LUKS_Mapping> luks_mapping_cache;
|
|
};
|
|
|
|
}//GParted
|
|
|
|
#endif /* GPARTED_LUKS_INFO_H */
|