[PATCH 08/11] dm-verity: add bdev_setsecurity hook for root-hash
From: <hidden>
Date: 2020-04-06 17:59:31
Also in:
linux-block, linux-integrity
Subsystem:
device-mapper (lvm), the rest · Maintainers:
Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
From: Deven Bowers <redacted> 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 <redacted> --- 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 6bd49aa48186..467db44de194 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 */
--
2.26.0