DM-Verity has an (undocumented) mode where no salt is used.
This was never handled directly by the DM-Verity code, instead working due
to the fact that calling crypto_shash_update() with a zero length data is
an implicit noop.
This is no longer the case now that we have switched to
crypto_ahash_update(). Fix the issue by introducing an explicit handling
of the no salt use case to DM-Verity.
Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Reported-by: Marian Csontos <mcsontos@xxxxxxxxxx>
Fixes: d1ac3ff ("dm verity: switch to using asynchronous hash crypto API")
CC: Milan Broz <gmazyland@xxxxxxxxx>
---
drivers/md/dm-verity-target.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index 97de961..1ec9b2c 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -166,7 +166,7 @@ static int verity_hash_init(struct dm_verity *v, struct ahash_request *req,
return r;
}
- if (likely(v->version >= 1))
+ if (likely(v->salt_size && (v->version >= 1)))
r = verity_hash_update(v, req, v->salt, v->salt_size, res);
return r;
@@ -177,7 +177,7 @@ static int verity_hash_final(struct dm_verity *v, struct ahash_request *req,
{
int r;
- if (unlikely(!v->version)) {
+ if (unlikely(v->salt_size && (!v->version))) {
r = verity_hash_update(v, req, v->salt, v->salt_size, res);
if (r < 0) {
--
2.1.4
--
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