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From: Deven Bowers <deven.desai@linux.microsoft.com>
To: agk@redhat.com, axboe@kernel.dk, snitzer@redhat.com,
	jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com,
	viro@zeniv.linux.org.uk, paul@paul-moore.com, eparis@redhat.com,
	jannh@google.com, dm-devel@redhat.com,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
	linux-audit@redhat.com
Cc: tyhicks@linux.microsoft.com, linux-kernel@vger.kernel.org,
	corbet@lwn.net, sashal@kernel.org,
	jaskarankhurana@linux.microsoft.com, mdsakib@microsoft.com,
	nramas@linux.microsoft.com, pasha.tatshin@soleen.com
Subject: [RFC PATCH v4 09/12] dm-verity: add bdev_setsecurity hook for root-hash
Date: Fri, 17 Jul 2020 16:09:38 -0700
Message-ID: <20200717230941.1190744-10-deven.desai@linux.microsoft.com> (raw)
In-Reply-To: <20200717230941.1190744-1-deven.desai@linux.microsoft.com>

Add a security hook call to set a security property of a block_device
in dm-verity with the root-hash that was verified to match the merkel-tree.

Signed-off-by: Deven Bowers <deven.desai@linux.microsoft.com>
---
 drivers/md/dm-verity-target.c | 8 ++++++++
 include/linux/device-mapper.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index c507f3a4e237..225f67ab378d 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -16,8 +16,10 @@
 #include "dm-verity.h"
 #include "dm-verity-fec.h"
 #include "dm-verity-verify-sig.h"
+#include "dm-core.h"
 #include <linux/module.h>
 #include <linux/reboot.h>
+#include <linux/security.h>
 
 #define DM_MSG_PREFIX			"verity"
 
@@ -530,6 +532,12 @@ static int verity_verify_io(struct dm_verity_io *io)
 			return -EIO;
 	}
 
+	r = security_bdev_setsecurity(dm_table_get_md(v->ti->table)->bdev,
+				      DM_VERITY_ROOTHASH_SEC_NAME,
+				      v->root_digest, v->digest_size);
+	if (unlikely(r < 0))
+		return r;
+
 	/*
 	 * At this point, the merkel tree has finished validating.
 	 * if signature was specified, validate the signature here.
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 02be0be21d38..b82e8223d52a 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -625,5 +625,6 @@ static inline unsigned long to_bytes(sector_t n)
 }
 
 #define DM_VERITY_SIGNATURE_SEC_NAME DM_NAME	".verity-sig"
+#define DM_VERITY_ROOTHASH_SEC_NAME DM_NAME	".verity-rh"
 
 #endif	/* _LINUX_DEVICE_MAPPER_H */
-- 
2.27.0


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17 23:09 [RFC PATCH v4 00/12] Integrity Policy Enforcement LSM (IPE) Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 01/12] scripts: add ipe tooling to generate boot policy Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 02/12] security: add ipe lsm evaluation loop and audit system Deven Bowers
2020-07-17 23:16   ` Randy Dunlap
2020-07-20 16:44     ` Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 03/12] security: add ipe lsm policy parser and policy loading Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 04/12] ipe: add property for trust of boot volume Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 05/12] fs: add security blob and hooks for block_device Deven Bowers
2020-07-18  0:14   ` Casey Schaufler
2020-07-20 16:42     ` Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 06/12] dm-verity: move signature check after tree validation Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 07/12] dm-verity: add bdev_setsecurity hook for dm-verity signature Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 08/12] ipe: add property for signed dmverity volumes Deven Bowers
2020-07-17 23:09 ` Deven Bowers [this message]
2020-07-17 23:09 ` [RFC PATCH v4 10/12] ipe: add property for dmverity roothash Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 11/12] documentation: add ipe documentation Deven Bowers
2020-07-17 23:09 ` [RFC PATCH v4 12/12] cleanup: uapi/linux/audit.h Deven Bowers

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