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| author | Mikulas Patocka <mpatocka@redhat.com> | 2017-01-04 20:23:53 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-03-24 15:49:07 -0400 |
| commit | 7eada909bfd7ac90a4522e56aa3179d1fd68cd14 (patch) | |
| tree | c39c6f09604428e790a9fe8946431830c75bb790 /drivers/md/Kconfig | |
| parent | 400a0befc96240f7bb2a53b9622deffd55d385fe (diff) | |
| download | lwn-7eada909bfd7ac90a4522e56aa3179d1fd68cd14.tar.gz lwn-7eada909bfd7ac90a4522e56aa3179d1fd68cd14.zip | |
dm: add integrity target
The dm-integrity target emulates a block device that has additional
per-sector tags that can be used for storing integrity information.
A general problem with storing integrity tags with every sector is that
writing the sector and the integrity tag must be atomic - i.e. in case of
crash, either both sector and integrity tag or none of them is written.
To guarantee write atomicity the dm-integrity target uses a journal. It
writes sector data and integrity tags into a journal, commits the journal
and then copies the data and integrity tags to their respective location.
The dm-integrity target can be used with the dm-crypt target - in this
situation the dm-crypt target creates the integrity data and passes them
to the dm-integrity target via bio_integrity_payload attached to the bio.
In this mode, the dm-crypt and dm-integrity targets provide authenticated
disk encryption - if the attacker modifies the encrypted device, an I/O
error is returned instead of random data.
The dm-integrity target can also be used as a standalone target, in this
mode it calculates and verifies the integrity tag internally. In this
mode, the dm-integrity target can be used to detect silent data
corruption on the disk or in the I/O path.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 982cd0626bc7..5c5ed97c9fda 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -500,4 +500,14 @@ config DM_LOG_WRITES If unsure, say N. +config DM_INTEGRITY + tristate "Integrity target" + depends on BLK_DEV_DM + select BLK_DEV_INTEGRITY + select DM_BUFIO + select CRYPTO + select ASYNC_XOR + ---help--- + This is the integrity target. + endif # MD |