ima: Make it independent from 'integrity' LSM

Make the 'ima' LSM independent from the 'integrity' LSM by introducing IMA
own integrity metadata (ima_iint_cache structure, with IMA-specific fields
from the integrity_iint_cache structure), and by managing it directly from
the 'ima' LSM.

Create ima_iint.c and introduce the same integrity metadata management
functions found in iint.c (renamed with ima_). However, instead of putting
metadata in an rbtree, reserve space from IMA in the inode security blob
for a pointer, and introduce the ima_inode_set_iint()/ima_inode_get_iint()
primitives to store/retrieve that pointer. This improves search time from
logarithmic to constant.

Consequently, don't include the inode pointer as field in the
ima_iint_cache structure, since the association with the inode is clear.
Since the inode field is missing in ima_iint_cache, pass the extra inode
parameter to ima_get_verity_digest().

Prefer storing the pointer instead of the entire ima_iint_cache structure,
to avoid too much memory pressure. Use the same mechanism as before, a
cache named ima_iint_cache (renamed from iint_cache), to quickly allocate
a new ima_iint_cache structure when requested by the IMA policy.

Create the new ima_iint_cache in ima_iintcache_init(),
called by init_ima_lsm(), during the initialization of the 'ima' LSM. And,
register ima_inode_free_security() to free the ima_iint_cache structure, if
exists.

Replace integrity_iint_cache with ima_iint_cache in various places of the
IMA code. Also, replace integrity_inode_get() and integrity_iint_find(),
respectively with ima_inode_get() and ima_iint_find().

Finally, move the remaining IMA-specific flags
to security/integrity/ima/ima.h, since they are now unnecessary in the
common integrity layer.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/integrity/ima/Makefile

@@ -4,7 +4,7 @@
 # Measurement Architecture(IMA).
 #
 
-obj-$(CONFIG_IMA) += ima.o
+obj-$(CONFIG_IMA) += ima.o ima_iint.o
 
 ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
 	 ima_policy.o ima_template.o ima_template_lib.o

security/integrity/ima/ima.h

@@ -60,7 +60,7 @@ extern const char boot_aggregate_name[];
 
 /* IMA event related data */
 struct ima_event_data {
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 	struct file *file;
 	const unsigned char *filename;
 	struct evm_ima_xattr_data *xattr_value;
@@ -119,6 +119,107 @@ struct ima_kexec_hdr {
 	u64 count;
 };
 
+/* IMA iint action cache flags */
+#define IMA_MEASURE		0x00000001
+#define IMA_MEASURED		0x00000002
+#define IMA_APPRAISE		0x00000004
+#define IMA_APPRAISED		0x00000008
+/*#define IMA_COLLECT		0x00000010  do not use this flag */
+#define IMA_COLLECTED		0x00000020
+#define IMA_AUDIT		0x00000040
+#define IMA_AUDITED		0x00000080
+#define IMA_HASH		0x00000100
+#define IMA_HASHED		0x00000200
+
+/* IMA iint policy rule cache flags */
+#define IMA_NONACTION_FLAGS	0xff000000
+#define IMA_DIGSIG_REQUIRED	0x01000000
+#define IMA_PERMIT_DIRECTIO	0x02000000
+#define IMA_NEW_FILE		0x04000000
+#define IMA_FAIL_UNVERIFIABLE_SIGS	0x10000000
+#define IMA_MODSIG_ALLOWED	0x20000000
+#define IMA_CHECK_BLACKLIST	0x40000000
+#define IMA_VERITY_REQUIRED	0x80000000
+
+#define IMA_DO_MASK		(IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
+				 IMA_HASH | IMA_APPRAISE_SUBMASK)
+#define IMA_DONE_MASK		(IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
+				 IMA_HASHED | IMA_COLLECTED | \
+				 IMA_APPRAISED_SUBMASK)
+
+/* IMA iint subaction appraise cache flags */
+#define IMA_FILE_APPRAISE	0x00001000
+#define IMA_FILE_APPRAISED	0x00002000
+#define IMA_MMAP_APPRAISE	0x00004000
+#define IMA_MMAP_APPRAISED	0x00008000
+#define IMA_BPRM_APPRAISE	0x00010000
+#define IMA_BPRM_APPRAISED	0x00020000
+#define IMA_READ_APPRAISE	0x00040000
+#define IMA_READ_APPRAISED	0x00080000
+#define IMA_CREDS_APPRAISE	0x00100000
+#define IMA_CREDS_APPRAISED	0x00200000
+#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
+				 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
+				 IMA_CREDS_APPRAISE)
+#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
+				 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
+				 IMA_CREDS_APPRAISED)
+
+/* IMA iint cache atomic_flags */
+#define IMA_CHANGE_XATTR	0
+#define IMA_UPDATE_XATTR	1
+#define IMA_CHANGE_ATTR		2
+#define IMA_DIGSIG		3
+#define IMA_MUST_MEASURE	4
+
+/* IMA integrity metadata associated with an inode */
+struct ima_iint_cache {
+	struct mutex mutex;	/* protects: version, flags, digest */
+	u64 version;		/* track inode changes */
+	unsigned long flags;
+	unsigned long measured_pcrs;
+	unsigned long atomic_flags;
+	unsigned long real_ino;
+	dev_t real_dev;
+	enum integrity_status ima_file_status:4;
+	enum integrity_status ima_mmap_status:4;
+	enum integrity_status ima_bprm_status:4;
+	enum integrity_status ima_read_status:4;
+	enum integrity_status ima_creds_status:4;
+	struct ima_digest_data *ima_hash;
+};
+
+extern struct lsm_blob_sizes ima_blob_sizes;
+
+static inline struct ima_iint_cache *
+ima_inode_get_iint(const struct inode *inode)
+{
+	struct ima_iint_cache **iint_sec;
+
+	if (unlikely(!inode->i_security))
+		return NULL;
+
+	iint_sec = inode->i_security + ima_blob_sizes.lbs_inode;
+	return *iint_sec;
+}
+
+static inline void ima_inode_set_iint(const struct inode *inode,
+				      struct ima_iint_cache *iint)
+{
+	struct ima_iint_cache **iint_sec;
+
+	if (unlikely(!inode->i_security))
+		return;
+
+	iint_sec = inode->i_security + ima_blob_sizes.lbs_inode;
+	*iint_sec = iint;
+}
+
+struct ima_iint_cache *ima_iint_find(struct inode *inode);
+struct ima_iint_cache *ima_inode_get(struct inode *inode);
+void ima_inode_free(struct inode *inode);
+void __init ima_iintcache_init(void);
+
 extern const int read_idmap[];
 
 #ifdef CONFIG_HAVE_IMA_KEXEC
@@ -152,8 +253,8 @@ int ima_calc_field_array_hash(struct ima_field_data *field_data,
 			      struct ima_template_entry *entry);
 int ima_calc_boot_aggregate(struct ima_digest_data *hash);
 void ima_add_violation(struct file *file, const unsigned char *filename,
-		       struct integrity_iint_cache *iint,
-		       const char *op, const char *cause);
+		       struct ima_iint_cache *iint, const char *op,
+		       const char *cause);
 int ima_init_crypto(void);
 void ima_putc(struct seq_file *m, void *data, int datalen);
 void ima_print_digest(struct seq_file *m, u8 *digest, u32 size);
@@ -267,10 +368,10 @@ int ima_get_action(struct mnt_idmap *idmap, struct inode *inode,
 		   struct ima_template_desc **template_desc,
 		   const char *func_data, unsigned int *allowed_algos);
 int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
-int ima_collect_measurement(struct integrity_iint_cache *iint,
-			    struct file *file, void *buf, loff_t size,
-			    enum hash_algo algo, struct modsig *modsig);
-void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
+int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file,
+			    void *buf, loff_t size, enum hash_algo algo,
+			    struct modsig *modsig);
+void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
 			   const unsigned char *filename,
 			   struct evm_ima_xattr_data *xattr_value,
 			   int xattr_len, const struct modsig *modsig, int pcr,
@@ -280,7 +381,7 @@ int process_buffer_measurement(struct mnt_idmap *idmap,
 			       const char *eventname, enum ima_hooks func,
 			       int pcr, const char *func_data,
 			       bool buf_hash, u8 *digest, size_t digest_len);
-void ima_audit_measurement(struct integrity_iint_cache *iint,
+void ima_audit_measurement(struct ima_iint_cache *iint,
 			   const unsigned char *filename);
 int ima_alloc_init_template(struct ima_event_data *event_data,
 			    struct ima_template_entry **entry,
@@ -318,17 +419,16 @@ int ima_policy_show(struct seq_file *m, void *v);
 #define IMA_APPRAISE_KEXEC	0x40
 
 #ifdef CONFIG_IMA_APPRAISE
-int ima_check_blacklist(struct integrity_iint_cache *iint,
+int ima_check_blacklist(struct ima_iint_cache *iint,
 			const struct modsig *modsig, int pcr);
-int ima_appraise_measurement(enum ima_hooks func,
-			     struct integrity_iint_cache *iint,
+int ima_appraise_measurement(enum ima_hooks func, struct ima_iint_cache *iint,
 			     struct file *file, const unsigned char *filename,
 			     struct evm_ima_xattr_data *xattr_value,
 			     int xattr_len, const struct modsig *modsig);
 int ima_must_appraise(struct mnt_idmap *idmap, struct inode *inode,
 		      int mask, enum ima_hooks func);
-void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
-enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
+void ima_update_xattr(struct ima_iint_cache *iint, struct file *file);
+enum integrity_status ima_get_cache_status(struct ima_iint_cache *iint,
 					   enum ima_hooks func);
 enum hash_algo ima_get_hash_algo(const struct evm_ima_xattr_data *xattr_value,
 				 int xattr_len);
@@ -337,14 +437,14 @@ int ima_read_xattr(struct dentry *dentry,
 void __init init_ima_appraise_lsm(const struct lsm_id *lsmid);
 
 #else
-static inline int ima_check_blacklist(struct integrity_iint_cache *iint,
+static inline int ima_check_blacklist(struct ima_iint_cache *iint,
 				      const struct modsig *modsig, int pcr)
 {
 	return 0;
 }
 
 static inline int ima_appraise_measurement(enum ima_hooks func,
-					   struct integrity_iint_cache *iint,
+					   struct ima_iint_cache *iint,
 					   struct file *file,
 					   const unsigned char *filename,
 					   struct evm_ima_xattr_data *xattr_value,
@@ -361,14 +461,13 @@ static inline int ima_must_appraise(struct mnt_idmap *idmap,
 	return 0;
 }
 
-static inline void ima_update_xattr(struct integrity_iint_cache *iint,
+static inline void ima_update_xattr(struct ima_iint_cache *iint,
 				    struct file *file)
 {
 }
 
-static inline enum integrity_status ima_get_cache_status(struct integrity_iint_cache
-							 *iint,
-							 enum ima_hooks func)
+static inline enum integrity_status
+ima_get_cache_status(struct ima_iint_cache *iint, enum ima_hooks func)
 {
 	return INTEGRITY_UNKNOWN;
 }

security/integrity/ima/ima_api.c

@@ -131,8 +131,8 @@ int ima_store_template(struct ima_template_entry *entry,
  * value is invalidated.
  */
 void ima_add_violation(struct file *file, const unsigned char *filename,
-		       struct integrity_iint_cache *iint,
-		       const char *op, const char *cause)
+		       struct ima_iint_cache *iint, const char *op,
+		       const char *cause)
 {
 	struct ima_template_entry *entry;
 	struct inode *inode = file_inode(file);
@@ -201,7 +201,8 @@ int ima_get_action(struct mnt_idmap *idmap, struct inode *inode,
 				allowed_algos);
 }
 
-static bool ima_get_verity_digest(struct integrity_iint_cache *iint,
+static bool ima_get_verity_digest(struct ima_iint_cache *iint,
+				  struct inode *inode,
 				  struct ima_max_digest_data *hash)
 {
 	enum hash_algo alg;
@@ -211,7 +212,7 @@ static bool ima_get_verity_digest(struct integrity_iint_cache *iint,
 	 * On failure, 'measure' policy rules will result in a file data
 	 * hash containing 0's.
 	 */
-	digest_len = fsverity_get_digest(iint->inode, hash->digest, NULL, &alg);
+	digest_len = fsverity_get_digest(inode, hash->digest, NULL, &alg);
 	if (digest_len == 0)
 		return false;
 
@@ -237,9 +238,9 @@ static bool ima_get_verity_digest(struct integrity_iint_cache *iint,
  *
  * Return 0 on success, error code otherwise
  */
-int ima_collect_measurement(struct integrity_iint_cache *iint,
-			    struct file *file, void *buf, loff_t size,
-			    enum hash_algo algo, struct modsig *modsig)
+int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file,
+			    void *buf, loff_t size, enum hash_algo algo,
+			    struct modsig *modsig)
 {
 	const char *audit_cause = "failed";
 	struct inode *inode = file_inode(file);
@@ -280,7 +281,7 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
 	memset(&hash.digest, 0, sizeof(hash.digest));
 
 	if (iint->flags & IMA_VERITY_REQUIRED) {
-		if (!ima_get_verity_digest(iint, &hash)) {
+		if (!ima_get_verity_digest(iint, inode, &hash)) {
 			audit_cause = "no-verity-digest";
 			result = -ENODATA;
 		}
@@ -338,8 +339,8 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
  *
  * Must be called with iint->mutex held.
  */
-void ima_store_measurement(struct integrity_iint_cache *iint,
-			   struct file *file, const unsigned char *filename,
+void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
+			   const unsigned char *filename,
 			   struct evm_ima_xattr_data *xattr_value,
 			   int xattr_len, const struct modsig *modsig, int pcr,
 			   struct ima_template_desc *template_desc)
@@ -382,7 +383,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
 		ima_free_template_entry(entry);
 }
 
-void ima_audit_measurement(struct integrity_iint_cache *iint,
+void ima_audit_measurement(struct ima_iint_cache *iint,
 			   const unsigned char *filename)
 {
 	struct audit_buffer *ab;

security/integrity/ima/ima_appraise.c

@@ -84,8 +84,7 @@ int ima_must_appraise(struct mnt_idmap *idmap, struct inode *inode,
 				NULL, NULL, NULL);
 }
 
-static int ima_fix_xattr(struct dentry *dentry,
-			 struct integrity_iint_cache *iint)
+static int ima_fix_xattr(struct dentry *dentry, struct ima_iint_cache *iint)
 {
 	int rc, offset;
 	u8 algo = iint->ima_hash->algo;
@@ -106,7 +105,7 @@ static int ima_fix_xattr(struct dentry *dentry,
 }
 
 /* Return specific func appraised cached result */
-enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
+enum integrity_status ima_get_cache_status(struct ima_iint_cache *iint,
 					   enum ima_hooks func)
 {
 	switch (func) {
@@ -126,7 +125,7 @@ enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
 	}
 }
 
-static void ima_set_cache_status(struct integrity_iint_cache *iint,
+static void ima_set_cache_status(struct ima_iint_cache *iint,
 				 enum ima_hooks func,
 				 enum integrity_status status)
 {
@@ -152,8 +151,7 @@ static void ima_set_cache_status(struct integrity_iint_cache *iint,
 	}
 }
 
-static void ima_cache_flags(struct integrity_iint_cache *iint,
-			     enum ima_hooks func)
+static void ima_cache_flags(struct ima_iint_cache *iint, enum ima_hooks func)
 {
 	switch (func) {
 	case MMAP_CHECK:
@@ -276,7 +274,7 @@ static int calc_file_id_hash(enum evm_ima_xattr_type type,
  *
  * Return 0 on success, error code otherwise.
  */
-static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint,
+static int xattr_verify(enum ima_hooks func, struct ima_iint_cache *iint,
 			struct evm_ima_xattr_data *xattr_value, int xattr_len,
 			enum integrity_status *status, const char **cause)
 {
@@ -443,7 +441,7 @@ static int modsig_verify(enum ima_hooks func, const struct modsig *modsig,
  *
  * Returns -EPERM if the hash is blacklisted.
  */
-int ima_check_blacklist(struct integrity_iint_cache *iint,
+int ima_check_blacklist(struct ima_iint_cache *iint,
 			const struct modsig *modsig, int pcr)
 {
 	enum hash_algo hash_algo;
@@ -477,8 +475,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
  *
  * Return 0 on success, error code otherwise
  */
-int ima_appraise_measurement(enum ima_hooks func,
-			     struct integrity_iint_cache *iint,
+int ima_appraise_measurement(enum ima_hooks func, struct ima_iint_cache *iint,
 			     struct file *file, const unsigned char *filename,
 			     struct evm_ima_xattr_data *xattr_value,
 			     int xattr_len, const struct modsig *modsig)
@@ -603,7 +600,7 @@ int ima_appraise_measurement(enum ima_hooks func,
 /*
  * ima_update_xattr - update 'security.ima' hash value
  */
-void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file)
+void ima_update_xattr(struct ima_iint_cache *iint, struct file *file)
 {
 	struct dentry *dentry = file_dentry(file);
 	int rc = 0;
@@ -640,7 +637,7 @@ static void ima_inode_post_setattr(struct mnt_idmap *idmap,
 				   struct dentry *dentry, int ia_valid)
 {
 	struct inode *inode = d_backing_inode(dentry);
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 	int action;
 
 	if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)
@@ -648,7 +645,7 @@ static void ima_inode_post_setattr(struct mnt_idmap *idmap,
 		return;
 
 	action = ima_must_appraise(idmap, inode, MAY_ACCESS, POST_SETATTR);
-	iint = integrity_iint_find(inode);
+	iint = ima_iint_find(inode);
 	if (iint) {
 		set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags);
 		if (!action)
@@ -674,12 +671,12 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name,
 
 static void ima_reset_appraise_flags(struct inode *inode, int digsig)
 {
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 
 	if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode))
 		return;
 
-	iint = integrity_iint_find(inode);
+	iint = ima_iint_find(inode);
 	if (!iint)
 		return;
 	iint->measured_pcrs = 0;

security/integrity/ima/ima_iint.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2008 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ *
+ * File: ima_iint.c
+ *	- implements the IMA hook: ima_inode_free
+ *	- cache integrity information in the inode security blob
+ */
+#include <linux/slab.h>
+
+#include "ima.h"
+
+static struct kmem_cache *ima_iint_cache __ro_after_init;
+
+/**
+ * ima_iint_find - Return the iint associated with an inode
+ * @inode: Pointer to the inode
+ *
+ * Return the IMA integrity information (iint) associated with an inode, if the
+ * inode was processed by IMA.
+ *
+ * Return: Found iint or NULL.
+ */
+struct ima_iint_cache *ima_iint_find(struct inode *inode)
+{
+	if (!IS_IMA(inode))
+		return NULL;
+
+	return ima_inode_get_iint(inode);
+}
+
+#define IMA_MAX_NESTING (FILESYSTEM_MAX_STACK_DEPTH + 1)
+
+/*
+ * It is not clear that IMA should be nested at all, but as long is it measures
+ * files both on overlayfs and on underlying fs, we need to annotate the iint
+ * mutex to avoid lockdep false positives related to IMA + overlayfs.
+ * See ovl_lockdep_annotate_inode_mutex_key() for more details.
+ */
+static inline void ima_iint_lockdep_annotate(struct ima_iint_cache *iint,
+					     struct inode *inode)
+{
+#ifdef CONFIG_LOCKDEP
+	static struct lock_class_key ima_iint_mutex_key[IMA_MAX_NESTING];
+
+	int depth = inode->i_sb->s_stack_depth;
+
+	if (WARN_ON_ONCE(depth < 0 || depth >= IMA_MAX_NESTING))
+		depth = 0;
+
+	lockdep_set_class(&iint->mutex, &ima_iint_mutex_key[depth]);
+#endif
+}
+
+static void ima_iint_init_always(struct ima_iint_cache *iint,
+				 struct inode *inode)
+{
+	iint->ima_hash = NULL;
+	iint->version = 0;
+	iint->flags = 0UL;
+	iint->atomic_flags = 0UL;
+	iint->ima_file_status = INTEGRITY_UNKNOWN;
+	iint->ima_mmap_status = INTEGRITY_UNKNOWN;
+	iint->ima_bprm_status = INTEGRITY_UNKNOWN;
+	iint->ima_read_status = INTEGRITY_UNKNOWN;
+	iint->ima_creds_status = INTEGRITY_UNKNOWN;
+	iint->measured_pcrs = 0;
+	mutex_init(&iint->mutex);
+	ima_iint_lockdep_annotate(iint, inode);
+}
+
+static void ima_iint_free(struct ima_iint_cache *iint)
+{
+	kfree(iint->ima_hash);
+	mutex_destroy(&iint->mutex);
+	kmem_cache_free(ima_iint_cache, iint);
+}
+
+/**
+ * ima_inode_get - Find or allocate an iint associated with an inode
+ * @inode: Pointer to the inode
+ *
+ * Find an iint associated with an inode, and allocate a new one if not found.
+ * Caller must lock i_mutex.
+ *
+ * Return: An iint on success, NULL on error.
+ */
+struct ima_iint_cache *ima_inode_get(struct inode *inode)
+{
+	struct ima_iint_cache *iint;
+
+	iint = ima_iint_find(inode);
+	if (iint)
+		return iint;
+
+	iint = kmem_cache_alloc(ima_iint_cache, GFP_NOFS);
+	if (!iint)
+		return NULL;
+
+	ima_iint_init_always(iint, inode);
+
+	inode->i_flags |= S_IMA;
+	ima_inode_set_iint(inode, iint);
+
+	return iint;
+}
+
+/**
+ * ima_inode_free - Called on inode free
+ * @inode: Pointer to the inode
+ *
+ * Free the iint associated with an inode.
+ */
+void ima_inode_free(struct inode *inode)
+{
+	struct ima_iint_cache *iint;
+
+	if (!IS_IMA(inode))
+		return;
+
+	iint = ima_iint_find(inode);
+	ima_inode_set_iint(inode, NULL);
+
+	ima_iint_free(iint);
+}
+
+static void ima_iint_init_once(void *foo)
+{
+	struct ima_iint_cache *iint = (struct ima_iint_cache *)foo;
+
+	memset(iint, 0, sizeof(*iint));
+}
+
+void __init ima_iintcache_init(void)
+{
+	ima_iint_cache =
+	    kmem_cache_create("ima_iint_cache", sizeof(struct ima_iint_cache),
+			      0, SLAB_PANIC, ima_iint_init_once);
+}

security/integrity/ima/ima_init.c

@@ -44,7 +44,7 @@ static int __init ima_add_boot_aggregate(void)
 	static const char op[] = "add_boot_aggregate";
 	const char *audit_cause = "ENOMEM";
 	struct ima_template_entry *entry;
-	struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
+	struct ima_iint_cache tmp_iint, *iint = &tmp_iint;
 	struct ima_event_data event_data = { .iint = iint,
 					     .filename = boot_aggregate_name };
 	struct ima_max_digest_data hash;

security/integrity/ima/ima_main.c

@@ -114,7 +114,7 @@ static int mmap_violation_check(enum ima_hooks func, struct file *file,
  *
  */
 static void ima_rdwr_violation_check(struct file *file,
-				     struct integrity_iint_cache *iint,
+				     struct ima_iint_cache *iint,
 				     int must_measure,
 				     char **pathbuf,
 				     const char **pathname,
@@ -127,7 +127,7 @@ static void ima_rdwr_violation_check(struct file *file,
 	if (mode & FMODE_WRITE) {
 		if (atomic_read(&inode->i_readcount) && IS_IMA(inode)) {
 			if (!iint)
-				iint = integrity_iint_find(inode);
+				iint = ima_iint_find(inode);
 			/* IMA_MEASURE is set from reader side */
 			if (iint && test_bit(IMA_MUST_MEASURE,
 						&iint->atomic_flags))
@@ -153,7 +153,7 @@ static void ima_rdwr_violation_check(struct file *file,
 				  "invalid_pcr", "open_writers");
 }
 
-static void ima_check_last_writer(struct integrity_iint_cache *iint,
+static void ima_check_last_writer(struct ima_iint_cache *iint,
 				  struct inode *inode, struct file *file)
 {
 	fmode_t mode = file->f_mode;
@@ -192,12 +192,12 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint,
 static void ima_file_free(struct file *file)
 {
 	struct inode *inode = file_inode(file);
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 
 	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
 		return;
 
-	iint = integrity_iint_find(inode);
+	iint = ima_iint_find(inode);
 	if (!iint)
 		return;
 
@@ -209,7 +209,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 			       enum ima_hooks func)
 {
 	struct inode *backing_inode, *inode = file_inode(file);
-	struct integrity_iint_cache *iint = NULL;
+	struct ima_iint_cache *iint = NULL;
 	struct ima_template_desc *template_desc = NULL;
 	char *pathbuf = NULL;
 	char filename[NAME_MAX];
@@ -248,7 +248,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	inode_lock(inode);
 
 	if (action) {
-		iint = integrity_inode_get(inode);
+		iint = ima_inode_get(inode);
 		if (!iint)
 			rc = -ENOMEM;
 	}
@@ -564,11 +564,11 @@ static int ima_file_check(struct file *file, int mask)
 static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf,
 			    size_t buf_size)
 {
-	struct integrity_iint_cache *iint = NULL, tmp_iint;
+	struct ima_iint_cache *iint = NULL, tmp_iint;
 	int rc, hash_algo;
 
 	if (ima_policy_flag) {
-		iint = integrity_iint_find(inode);
+		iint = ima_iint_find(inode);
 		if (iint)
 			mutex_lock(&iint->mutex);
 	}
@@ -578,7 +578,6 @@ static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf,
 			mutex_unlock(&iint->mutex);
 
 		memset(&tmp_iint, 0, sizeof(tmp_iint));
-		tmp_iint.inode = inode;
 		mutex_init(&tmp_iint.mutex);
 
 		rc = ima_collect_measurement(&tmp_iint, file, NULL, 0,
@@ -688,7 +687,7 @@ static void ima_post_create_tmpfile(struct mnt_idmap *idmap,
 				    struct inode *inode)
 
 {
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 	int must_appraise;
 
 	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
@@ -700,7 +699,7 @@ static void ima_post_create_tmpfile(struct mnt_idmap *idmap,
 		return;
 
 	/* Nothing to do if we can't allocate memory */
-	iint = integrity_inode_get(inode);
+	iint = ima_inode_get(inode);
 	if (!iint)
 		return;
 
@@ -719,7 +718,7 @@ static void ima_post_create_tmpfile(struct mnt_idmap *idmap,
  */
 static void ima_post_path_mknod(struct mnt_idmap *idmap, struct dentry *dentry)
 {
-	struct integrity_iint_cache *iint;
+	struct ima_iint_cache *iint;
 	struct inode *inode = dentry->d_inode;
 	int must_appraise;
 
@@ -732,7 +731,7 @@ static void ima_post_path_mknod(struct mnt_idmap *idmap, struct dentry *dentry)
 		return;
 
 	/* Nothing to do if we can't allocate memory */
-	iint = integrity_inode_get(inode);
+	iint = ima_inode_get(inode);
 	if (!iint)
 		return;
 
@@ -935,7 +934,7 @@ int process_buffer_measurement(struct mnt_idmap *idmap,
 	int ret = 0;
 	const char *audit_cause = "ENOMEM";
 	struct ima_template_entry *entry = NULL;
-	struct integrity_iint_cache iint = {};
+	struct ima_iint_cache iint = {};
 	struct ima_event_data event_data = {.iint = &iint,
 					    .filename = eventname,
 					    .buf = buf,
@@ -1172,6 +1171,7 @@ static struct security_hook_list ima_hooks[] __ro_after_init = {
 #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
 	LSM_HOOK_INIT(kernel_module_request, ima_kernel_module_request),
 #endif
+	LSM_HOOK_INIT(inode_free_security, ima_inode_free),
 };
 
 static const struct lsm_id ima_lsmid = {
@@ -1181,15 +1181,21 @@ static const struct lsm_id ima_lsmid = {
 
 static int __init init_ima_lsm(void)
 {
+	ima_iintcache_init();
 	security_add_hooks(ima_hooks, ARRAY_SIZE(ima_hooks), &ima_lsmid);
 	init_ima_appraise_lsm(&ima_lsmid);
 	return 0;
 }
 
+struct lsm_blob_sizes ima_blob_sizes __ro_after_init = {
+	.lbs_inode = sizeof(struct ima_iint_cache *),
+};
+
 DEFINE_LSM(ima) = {
 	.name = "ima",
 	.init = init_ima_lsm,
 	.order = LSM_ORDER_LAST,
+	.blobs = &ima_blob_sizes,
 };
 
 late_initcall(init_ima);	/* Start IMA after the TPM is available */

security/integrity/ima/ima_policy.c

@@ -49,7 +49,7 @@
 #define DONT_HASH	0x0200
 
 #define INVALID_PCR(a) (((a) < 0) || \
-	(a) >= (sizeof_field(struct integrity_iint_cache, measured_pcrs) * 8))
+	(a) >= (sizeof_field(struct ima_iint_cache, measured_pcrs) * 8))
 
 int ima_policy_flag;
 static int temp_ima_appraise;

security/integrity/integrity.h

@@ -20,59 +20,6 @@
 #include <linux/audit.h>
 #include <linux/lsm_hooks.h>
 
-/* iint action cache flags */
-#define IMA_MEASURE		0x00000001
-#define IMA_MEASURED		0x00000002
-#define IMA_APPRAISE		0x00000004
-#define IMA_APPRAISED		0x00000008
-/*#define IMA_COLLECT		0x00000010  do not use this flag */
-#define IMA_COLLECTED		0x00000020
-#define IMA_AUDIT		0x00000040
-#define IMA_AUDITED		0x00000080
-#define IMA_HASH		0x00000100
-#define IMA_HASHED		0x00000200
-
-/* iint policy rule cache flags */
-#define IMA_NONACTION_FLAGS	0xff000000
-#define IMA_DIGSIG_REQUIRED	0x01000000
-#define IMA_PERMIT_DIRECTIO	0x02000000
-#define IMA_NEW_FILE		0x04000000
-#define IMA_FAIL_UNVERIFIABLE_SIGS	0x10000000
-#define IMA_MODSIG_ALLOWED	0x20000000
-#define IMA_CHECK_BLACKLIST	0x40000000
-#define IMA_VERITY_REQUIRED	0x80000000
-
-#define IMA_DO_MASK		(IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
-				 IMA_HASH | IMA_APPRAISE_SUBMASK)
-#define IMA_DONE_MASK		(IMA_MEASURED | IMA_APPRAISED | IMA_AUDITED | \
-				 IMA_HASHED | IMA_COLLECTED | \
-				 IMA_APPRAISED_SUBMASK)
-
-/* iint subaction appraise cache flags */
-#define IMA_FILE_APPRAISE	0x00001000
-#define IMA_FILE_APPRAISED	0x00002000
-#define IMA_MMAP_APPRAISE	0x00004000
-#define IMA_MMAP_APPRAISED	0x00008000
-#define IMA_BPRM_APPRAISE	0x00010000
-#define IMA_BPRM_APPRAISED	0x00020000
-#define IMA_READ_APPRAISE	0x00040000
-#define IMA_READ_APPRAISED	0x00080000
-#define IMA_CREDS_APPRAISE	0x00100000
-#define IMA_CREDS_APPRAISED	0x00200000
-#define IMA_APPRAISE_SUBMASK	(IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
-				 IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \
-				 IMA_CREDS_APPRAISE)
-#define IMA_APPRAISED_SUBMASK	(IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
-				 IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \
-				 IMA_CREDS_APPRAISED)
-
-/* iint cache atomic_flags */
-#define IMA_CHANGE_XATTR	0
-#define IMA_UPDATE_XATTR	1
-#define IMA_CHANGE_ATTR		2
-#define IMA_DIGSIG		3
-#define IMA_MUST_MEASURE	4
-
 enum evm_ima_xattr_type {
 	IMA_XATTR_DIGEST = 0x01,
 	EVM_XATTR_HMAC,