diff options
| author | Milan Broz <gmazyland@gmail.com> | 2017-09-13 16:45:56 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-10-04 17:49:58 +0300 |
| commit | 783874b050768d361239e444ba0fa396bb6d463f (patch) | |
| tree | bc41ab9d2de82b5aedf85216eacdadd61b44d770 | |
| parent | bd86e32059526e2d0d13ca1e4447dfbbddb6e5cc (diff) | |
| download | linux-783874b050768d361239e444ba0fa396bb6d463f.tar.xz | |
dm crypt: reject sector_size feature if device length is not aligned to it
If a crypt mapping uses optional sector_size feature, additional
restrictions to mapped device segment size must be applied in
constructor, otherwise the device activation will fail later.
Fixes: 8f0009a225 ("dm crypt: optionally support larger encryption sector size")
Cc: stable@vger.kernel.org # 4.12+
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
| -rw-r--r-- | drivers/md/dm-crypt.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 75341fdca4b6..96ab46512e1f 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -2585,6 +2585,10 @@ static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **ar ti->error = "Invalid feature value for sector_size"; return -EINVAL; } + if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) { + ti->error = "Device size is not multiple of sector_size feature"; + return -EINVAL; + } cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT; } else if (!strcasecmp(opt_string, "iv_large_sectors")) set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags); |