linux-kernel - [RFC PATCH v3 07/12] dm-verity: add bdev_setsecurity hook for dm-verity signature

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Date:   Wed, 15 Apr 2020 09:25:45 -0700
From:   deven.desai@...ux.microsoft.com
To:     agk@...hat.com, axboe@...nel.dk, snitzer@...hat.com,
        jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, dm-devel@...hat.com,
        linux-block@...r.kernel.org, jannh@...gle.com
Cc:     tyhicks@...ux.microsoft.com, pasha.tatashin@...een.com,
        sashal@...nel.org, jaskarankhurana@...ux.microsoft.com,
        nramas@...ux.microsoft.com, mdsakib@...ux.microsoft.com,
        linux-kernel@...r.kernel.org, corbet@....net
Subject: [RFC PATCH v3 07/12] dm-verity: add bdev_setsecurity hook for dm-verity signature

From: Deven Bowers <deven.desai@...ux.microsoft.com>

Add a security hook call to set a security property of a block_device
in dm-verity with the results of a verified, signed root-hash.

Signed-off-by: Deven Bowers <deven.desai@...ux.microsoft.com>
---
 drivers/md/dm-verity-verify-sig.c | 7 +++++++
 include/linux/device-mapper.h     | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/md/dm-verity-verify-sig.c b/drivers/md/dm-verity-verify-sig.c
index 27dac8aa2e5a..242e2421d3c8 100644
--- a/drivers/md/dm-verity-verify-sig.c
+++ b/drivers/md/dm-verity-verify-sig.c
@@ -8,7 +8,10 @@
 #include <linux/device-mapper.h>
 #include <linux/verification.h>
 #include <keys/user-type.h>
+#include <linux/security.h>
+#include <linux/list.h>
 #include <linux/module.h>
+#include "dm-core.h"
 #include "dm-verity.h"
 #include "dm-verity-verify-sig.h"
 
@@ -182,6 +185,10 @@ int verity_verify_root_hash(const struct dm_verity *v)
 		goto cleanup;
 
 	sig_target->passed = true;
+
+	ret = security_bdev_setsecurity(dm_table_get_md(v->ti->table)->bdev,
+					DM_VERITY_SIGNATURE_SEC_NAME,
+					v->sig->sig, v->sig->sig_size);
 cleanup:
 	kfree(root_hash);
 	return ret;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index af48d9da3916..61c26443783c 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -627,4 +627,6 @@ static inline unsigned long to_bytes(sector_t n)
 	return (n << SECTOR_SHIFT);
 }
 
+#define DM_VERITY_SIGNATURE_SEC_NAME DM_NAME	".verity-sig"
+
 #endif	/* _LINUX_DEVICE_MAPPER_H */
-- 
2.26.0