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BACKPORT: dm verity: set DM_TARGET_IMMUTABLE feature flag

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commit 4caae58406 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.

Bug: 234475629
Fixes: a4ffc15219 ("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>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Iaeec7fa3be98a646062439e4551f84242dacfb45
This commit is contained in:
Sarthak Kukreti
2022-05-31 15:56:40 -04:00
committed by Treehugger Robot
parent 2bd9e6cddc
commit c762f435c0
1 changed files with 1 additions and 0 deletions
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drivers/md/dm-verity-target.c
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@@ -1252,6 +1252,7 @@ bad:
static struct target_type verity_target = { static struct target_type verity_target = {
.name = "verity", .name = "verity",
.version = {1, 7, 0}, .version = {1, 7, 0},
.features = DM_TARGET_IMMUTABLE,
.module = THIS_MODULE, .module = THIS_MODULE,
.ctr = verity_ctr, .ctr = verity_ctr,
.dtr = verity_dtr, .dtr = verity_dtr,