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dm verity: set DM_TARGET_SINGLETON feature flag

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The device-mapper has a flag to mark targets as singleton, which is a
required flag for immutable targets. Without this flag, multiple
dm-verity targets can be added to a mapped device, which has no
practical use cases and will let dm_table_get_immutable_target return
NULL. This patch adds the missing flag, restricting only one
dm-verity target per mapped device.

Signed-off-by: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Fan Wu 2024-01-30 14:37:00 -08:00 committed by Mike Snitzer
parent 5d8d408153
commit 9356fcfe0a
1 changed files with 1 additions and 1 deletions
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drivers/md/dm-verity-target.c
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@ -1566,7 +1566,7 @@ int dm_verity_get_root_digest(struct dm_target *ti, u8 **root_digest, unsigned i
static struct target_type verity_target = {
.name = "verity",
.features = DM_TARGET_IMMUTABLE,
.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE,
.version = {1, 10, 0},
.module = THIS_MODULE,
.ctr = verity_ctr,