ima: differentiate appraise status only for hook specific rules
Different hooks can require different methods for appraising a
file's integrity. As a result, an integrity appraisal status is
cached on a per hook basis.
Only a hook specific rule, requires the inode to be re-appraised.
This patch eliminates unnecessary appraisals.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 66b7f40..3e751a9 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -146,7 +146,7 @@
struct integrity_iint_cache *iint;
char *pathbuf = NULL;
const char *pathname = NULL;
- int rc = -ENOMEM, action, must_appraise;
+ int rc = -ENOMEM, action, must_appraise, _func;
if (!ima_initialized || !S_ISREG(inode->i_mode))
return 0;
@@ -161,6 +161,9 @@
must_appraise = action & IMA_APPRAISE;
+ /* Is the appraise rule hook specific? */
+ _func = (action & IMA_FILE_APPRAISE) ? FILE_CHECK : function;
+
mutex_lock(&inode->i_mutex);
iint = integrity_inode_get(inode);
@@ -178,7 +181,7 @@
/* Nothing to do, just return existing appraised status */
if (!action) {
if (must_appraise)
- rc = ima_get_cache_status(iint, function);
+ rc = ima_get_cache_status(iint, _func);
goto out_digsig;
}
@@ -195,7 +198,7 @@
if (action & IMA_MEASURE)
ima_store_measurement(iint, file, pathname);
if (action & IMA_APPRAISE_SUBMASK)
- rc = ima_appraise_measurement(function, iint, file, pathname);
+ rc = ima_appraise_measurement(_func, iint, file, pathname);
if (action & IMA_AUDIT)
ima_audit_measurement(iint, pathname);
kfree(pathbuf);
