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dm verity: set DM_TARGET_IMMUTABLE feature flag

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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>
This commit is contained in:
Sarthak Kukreti 2022-05-31 15:56:40 -04:00 committed by Greg Kroah-Hartman
parent 1dbcb821c6
commit 388bc1e696
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-verity-target.c
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@ -1163,6 +1163,7 @@ bad:
static struct target_type verity_target = {
.name = "verity",
.features = DM_TARGET_IMMUTABLE,
.version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = verity_ctr,