ima: define new function ima_alloc_init_template() to API

Instead of allocating and initializing the template entry from multiple
places (eg. boot aggregate, violation, and regular measurements), this
patch defines a new function called ima_alloc_init_template().  The new
function allocates and initializes the measurement entry with the inode
digest and the filename.

In respect to the current behavior, it truncates the file name passed
in the 'filename' argument if the latter's size is greater than 255 bytes
and the passed file descriptor is NULL.

Changelog:
- initialize 'hash' variable for non TPM case - Mimi
- conform to expectation for 'iint' to be defined as a pointer. - Mimi
- add missing 'file' dependency for recalculating file hash. - Mimi

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 27d2ffbd0763..da03d3389619 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -107,6 +107,9 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
                            const unsigned char *filename);
 void ima_audit_measurement(struct integrity_iint_cache *iint,
                            const unsigned char *filename);
+int ima_alloc_init_template(struct integrity_iint_cache *iint,
+                            struct file *file, const unsigned char *filename,
+                            struct ima_template_entry **entry);
 int ima_store_template(struct ima_template_entry *entry, int violation,
                        struct inode *inode, const unsigned char *filename);
 void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);