diff options
Diffstat (limited to 'drivers/md/dm-verity-target.c')
| -rw-r--r-- | drivers/md/dm-verity-target.c | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index d6dbd47492a8..4fd853a56b1a 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -19,6 +19,7 @@ #include <linux/module.h> #include <linux/reboot.h> #include <linux/scatterlist.h> +#include <linux/string.h> #define DM_MSG_PREFIX "verity" @@ -527,11 +528,10 @@ static int verity_verify_io(struct dm_verity_io *io) if (v->validated_blocks) set_bit(cur_block, v->validated_blocks); continue; - } - else if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA, - cur_block, NULL, &start) == 0) + } else if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA, + cur_block, NULL, &start) == 0) { continue; - else { + } else { if (bio->bi_status) { /* * Error correction failed; Just return error @@ -1310,10 +1310,40 @@ bad: return r; } +/* + * Check whether a DM target is a verity target. + */ +bool dm_is_verity_target(struct dm_target *ti) +{ + return ti->type->module == THIS_MODULE; +} + +/* + * Get the root digest of a verity target. + * + * Returns a copy of the root digest, the caller is responsible for + * freeing the memory of the digest. + */ +int dm_verity_get_root_digest(struct dm_target *ti, u8 **root_digest, unsigned int *digest_size) +{ + struct dm_verity *v = ti->private; + + if (!dm_is_verity_target(ti)) + return -EINVAL; + + *root_digest = kmemdup(v->root_digest, v->digest_size, GFP_KERNEL); + if (*root_digest == NULL) + return -ENOMEM; + + *digest_size = v->digest_size; + + return 0; +} + static struct target_type verity_target = { .name = "verity", .features = DM_TARGET_IMMUTABLE, - .version = {1, 8, 0}, + .version = {1, 8, 1}, .module = THIS_MODULE, .ctr = verity_ctr, .dtr = verity_dtr, |