Index: linux-2.6.9/security/seclvl.c
===================================================================
--- linux-2.6.9.orig/security/seclvl.c	2004-11-21 06:41:57.000000000 -0600
+++ linux-2.6.9/security/seclvl.c	2004-11-21 07:04:55.260035216 -0600
@@ -35,6 +35,7 @@
 #include <linux/sysfs.h>
 
 #define SHA1_DIGEST_SIZE 20
+#define SECLVL_LSM_ID 0xF45
 
 /**
  * Module parameter that defines the initial secure level.
@@ -485,11 +486,18 @@
 	return 0;
 }
 
+struct seclvl_i_sec {
+	struct security_list lsm_list;
+	struct task_struct *task;
+};
+
 /* claim the blockdev to exclude mounters, release on file close */
 static int seclvl_bd_claim(struct inode *inode)
 {
 	int holder;
 	struct block_device *bdev = NULL;
+	struct seclvl_i_sec *sec, *osec;
+
 	dev_t dev = inode->i_rdev;
 	bdev = open_by_devnum(dev, FMODE_WRITE);
 	if (bdev) {
@@ -498,7 +506,15 @@
 			return -EPERM;
 		}
 		/* claimed, mark it to release on close */
-		inode->i_security = current;
+		sec = kmalloc(sizeof(struct seclvl_i_sec), GFP_KERNEL);
+		if (!sec) {
+			blkdev_put(bdev);
+			return -EPERM;
+		}
+		sec->task = current;
+		osec = security_set_value_type(&inode->i_security,
+			SECLVL_LSM_ID, sec, struct seclvl_i_sec);
+		kfree(osec);
 	}
 	return 0;
 }
@@ -506,12 +522,24 @@
 /* release the blockdev if you claimed it */
 static void seclvl_bd_release(struct inode *inode)
 {
-	if (inode && S_ISBLK(inode->i_mode) && inode->i_security == current) {
-		struct block_device *bdev = inode->i_bdev;
-		if (bdev) {
-			bd_release(bdev);
-			blkdev_put(bdev);
-			inode->i_security = NULL;
+	if (inode && S_ISBLK(inode->i_mode)) {
+		struct seclvl_i_sec *sec;
+
+		sec = security_get_value_type(&inode->i_security,
+			SECLVL_LSM_ID, struct seclvl_i_sec);
+		if (!sec)
+			return;
+		if (sec->task == current) {
+			struct block_device *bdev = inode->i_bdev;
+			if (bdev) {
+				bd_release(bdev);
+				blkdev_put(bdev);
+				sec = security_del_value_type(
+						&inode->i_security,
+						SECLVL_LSM_ID,
+						struct seclvl_i_sec);
+				kfree(sec);
+			}
 		}
 	}
 }