From: Fan Wu Date: Tue, 30 Jan 2024 22:37:00 +0000 (-0800) Subject: dm verity: set DM_TARGET_SINGLETON feature flag X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9356fcfe0ac4a8545f9fc32f2e404524e1115ee6;p=linux.git dm verity: set DM_TARGET_SINGLETON feature flag 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 Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index 01ec71dcbc7d9..6b8f9698488e7 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -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,