ima: pass iint to ima_add_violation()

This patch adds the iint associated to the current inode as a new
parameter of ima_add_violation(). The passed iint is always not NULL
if a violation is detected. This modification will be used to determine
the inode for which there is a violation.

Since the 'd' and 'd-ng' template field init() functions were detecting
a violation from the value of the iint pointer, they now check the new
field 'violation', added to the 'ima_event_data' structure.

Changelog:
 - v1:
   - modified an old comment (Roberto Sassu)
Signed-off-by: Roberto Sassu <rsassu@suse.de>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

security/integrity/ima/ima.h

@@ -59,6 +59,7 @@ struct ima_event_data {
 	const unsigned char *filename;
 	struct evm_ima_xattr_data *xattr_value;
 	int xattr_len;
+	const char *violation;
 };
 
 /* IMA template field data definition */
@@ -110,6 +111,7 @@ int ima_calc_field_array_hash(struct ima_field_data *field_data,
 			      struct ima_digest_data *hash);
 int __init 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);
 int ima_init_crypto(void);
 void ima_putc(struct seq_file *m, void *data, int datalen);

security/integrity/ima/ima_api.c

@@ -126,11 +126,13 @@ 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_template_entry *entry;
 	struct inode *inode = file_inode(file);
-	struct ima_event_data event_data = {NULL, file, filename, NULL, 0};
+	struct ima_event_data event_data = {iint, file, filename, NULL, 0,
+					    cause};
 	int violation = 1;
 	int result;
 
@@ -264,8 +266,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
 	int result = -ENOMEM;
 	struct inode *inode = file_inode(file);
 	struct ima_template_entry *entry;
-	struct ima_event_data event_data = {iint, file, filename,
-					    xattr_value, xattr_len};
+	struct ima_event_data event_data = {iint, file, filename, xattr_value,
+					    xattr_len, NULL};
 	int violation = 0;
 
 	if (iint->flags & IMA_MEASURED)

security/integrity/ima/ima_init.c

@@ -50,7 +50,7 @@ static int __init ima_add_boot_aggregate(void)
 	struct ima_template_entry *entry;
 	struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
 	struct ima_event_data event_data = {iint, NULL, boot_aggregate_name,
-					    NULL, 0};
+					    NULL, 0, NULL};
 	int result = -ENOMEM;
 	int violation = 0;
 	struct {

security/integrity/ima/ima_main.c

@@ -106,9 +106,10 @@ static void ima_rdwr_violation_check(struct file *file,
 	*pathname = ima_d_path(&file->f_path, pathbuf);
 
 	if (send_tomtou)
-		ima_add_violation(file, *pathname, "invalid_pcr", "ToMToU");
+		ima_add_violation(file, *pathname, iint,
+				  "invalid_pcr", "ToMToU");
 	if (send_writers)
-		ima_add_violation(file, *pathname,
+		ima_add_violation(file, *pathname, iint,
 				  "invalid_pcr", "open_writers");
 }
 

security/integrity/ima/ima_template_lib.c

@@ -209,7 +209,7 @@ int ima_eventdigest_init(struct ima_event_data *event_data,
 
 	memset(&hash, 0, sizeof(hash));
 
-	if (!event_data->iint)		/* recording a violation. */
+	if (event_data->violation)	/* recording a violation. */
 		goto out;
 
 	if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
@@ -247,8 +247,7 @@ int ima_eventdigest_ng_init(struct ima_event_data *event_data,
 	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
 	u32 cur_digestsize = 0;
 
-	/* If iint is NULL, we are recording a violation. */
-	if (!event_data->iint)
+	if (event_data->violation)	/* recording a violation. */
 		goto out;
 
 	cur_digest = event_data->iint->ima_hash->digest;