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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 05-02-2012, 07:13 PM
 
Default Adds support for security checks in the crypt target

From: Ondrej Kozina <okozina@redhat.com>

Just a security check implementation for the crypt target

---
drivers/md/dm-crypt.c | 37 ++++++++++++++++++++++++++++++++++++-
1 files changed, 36 insertions(+), 1 deletions(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 3f06df5..06e2018 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -28,6 +28,7 @@
#include <crypto/algapi.h>

#include <linux/device-mapper.h>
+#include "dm.h"

#define DM_MSG_PREFIX "crypt"

@@ -1867,9 +1868,42 @@ static int crypt_iterate_devices(struct dm_target *ti,
return fn(ti, cc->dev, cc->start, ti->len, data);
}

+static int crypt_security(struct dm_target *ti, unsigned int argc, char **argv)
+{
+ int perm = 0, r;
+ struct dentry *bdev_dentry;
+
+ if (argc < 4) {
+ ti->error = "dm-crypt: Security check: invalid number of parameters";
+ return -EINVAL;
+ }
+ bdev_dentry = dm_lookup_bdev_dentry(argv[3]);
+
+ if (IS_ERR(bdev_dentry)) {
+ ti->error = "dm-crypt: security_check: Couldn't get dentry for bdev";
+ r = PTR_ERR(bdev_dentry);
+ goto err;
+ }
+
+ /* FIXME: MAY_ACCESS, MAY_OPEN ?*/
+ if (dm_table_get_mode(ti->table) & FMODE_READ)
+ perm |= MAY_READ;
+ if (dm_table_get_mode(ti->table) & FMODE_WRITE)
+ perm |= MAY_WRITE;
+
+ r = inode_permission(bdev_dentry->d_inode, perm);
+
+ if (r)
+ ti->error = "dm-crypt: Security check failed";
+
+ dput(bdev_dentry);
+err:
+ return r;
+}
+
static struct target_type crypt_target = {
.name = "crypt",
- .version = {1, 11, 0},
+ .version = {1, 12, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
@@ -1881,6 +1915,7 @@ static struct target_type crypt_target = {
.message = crypt_message,
.merge = crypt_merge,
.iterate_devices = crypt_iterate_devices,
+ .security = crypt_security
};

static int __init dm_crypt_init(void)
--
1.7.8.5

--
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