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dm: support key eviction from keyslot managers of underlying devices

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Now that device mapper supports inline encryption, add the ability to
evict keys from all underlying devices. When an upper layer requests
a key eviction, we simply iterate through all underlying devices
and evict that key from each device.

Co-developed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Satya Tangirala <satyat@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Satya Tangirala 2021-02-01 05:10:18 +00:00 committed by Mike Snitzer
parent aa6ce87a76
commit 9355a9eb21
2 changed files with 54 additions and 0 deletions
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1
block/blk-crypto.c
View File

@ -409,3 +409,4 @@ int blk_crypto_evict_key(struct request_queue *q,
*/
return blk_crypto_fallback_evict_key(key);
}
EXPORT_SYMBOL_GPL(blk_crypto_evict_key);

53
drivers/md/dm-table.c
View File

@ -1214,6 +1214,58 @@ struct dm_keyslot_manager {
struct mapped_device *md;
};
struct dm_keyslot_evict_args {
const struct blk_crypto_key *key;
int err;
};
static int dm_keyslot_evict_callback(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
struct dm_keyslot_evict_args *args = data;
int err;
err = blk_crypto_evict_key(bdev_get_queue(dev->bdev), args->key);
if (!args->err)
args->err = err;
/* Always try to evict the key from all devices. */
return 0;
}
/*
* When an inline encryption key is evicted from a device-mapper device, evict
* it from all the underlying devices.
*/
static int dm_keyslot_evict(struct blk_keyslot_manager *ksm,
const struct blk_crypto_key *key, unsigned int slot)
{
struct dm_keyslot_manager *dksm = container_of(ksm,
struct dm_keyslot_manager,
ksm);
struct mapped_device *md = dksm->md;
struct dm_keyslot_evict_args args = { key };
struct dm_table *t;
int srcu_idx;
int i;
struct dm_target *ti;
t = dm_get_live_table(md, &srcu_idx);
if (!t)
return 0;
for (i = 0; i < dm_table_get_num_targets(t); i++) {
ti = dm_table_get_target(t, i);
if (!ti->type->iterate_devices)
continue;
ti->type->iterate_devices(ti, dm_keyslot_evict_callback, &args);
}
dm_put_live_table(md, srcu_idx);
return args.err;
}
static struct blk_ksm_ll_ops dm_ksm_ll_ops = {
.keyslot_evict = dm_keyslot_evict,
};
static int device_intersect_crypto_modes(struct dm_target *ti,
struct dm_dev *dev, sector_t start,
sector_t len, void *data)
@ -1270,6 +1322,7 @@ static int dm_table_construct_keyslot_manager(struct dm_table *t)
ksm = &dksm->ksm;
blk_ksm_init_passthrough(ksm);
ksm->ksm_ll_ops = dm_ksm_ll_ops;
ksm->max_dun_bytes_supported = UINT_MAX;
memset(ksm->crypto_modes_supported, 0xFF,
sizeof(ksm->crypto_modes_supported));