From: Sarthak Kukreti sarthakkukreti@google.com
commit 4caae58406f8ceb741603eee460d79bacca9b1b5 upstream.
The device-mapper framework provides a mechanism to mark targets as immutable (and hence fail table reloads that try to change the target type). Add the DM_TARGET_IMMUTABLE flag to the dm-verity target's feature flags to prevent switching the verity target with a different target type.
Fixes: a4ffc152198e ("dm: add verity target") Cc: stable@vger.kernel.org Signed-off-by: Sarthak Kukreti sarthakkukreti@google.com Reviewed-by: Kees Cook keescook@chromium.org Signed-off-by: Mike Snitzer snitzer@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-verity-target.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -1242,6 +1242,7 @@ bad:
static struct target_type verity_target = { .name = "verity", + .features = DM_TARGET_IMMUTABLE, .version = {1, 7, 0}, .module = THIS_MODULE, .ctr = verity_ctr,