linux-kernel - [PATCH 4.19 24/30] dm verity: set DM_TARGET

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Message-Id: <20220603173815.803602103@linuxfoundation.org>
Date:   Fri,  3 Jun 2022 19:39:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sarthak Kukreti <sarthakkukreti@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Mike Snitzer <snitzer@...nel.org>
Subject: [PATCH 4.19 24/30] dm verity: set DM_TARGET_IMMUTABLE feature flag

From: Sarthak Kukreti <sarthakkukreti@...gle.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@...r.kernel.org
Signed-off-by: Sarthak Kukreti <sarthakkukreti@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Mike Snitzer <snitzer@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -1176,6 +1176,7 @@ bad:
 
 static struct target_type verity_target = {
 	.name		= "verity",
+	.features	= DM_TARGET_IMMUTABLE,
 	.version	= {1, 4, 0},
 	.module		= THIS_MODULE,
 	.ctr		= verity_ctr,