ima: remove unnecessary call to ima_must_measure
The original ima_must_measure() function based its results on cached
iint information, which required an iint be allocated for all files.
Currently, an iint is allocated only for files in policy. As a result,
for those files in policy, ima_must_measure() is now called twice: once
to determine if the inode is in the measurement policy and, the second
time, to determine if it needs to be measured/re-measured.
The second call to ima_must_measure() unnecessarily checks to see if
the file is in policy. As we already know the file is in policy, this
patch removes the second unnecessary call to ima_must_measure(), removes
the vestige iint parameter, and just checks the iint directly to determine
if the inode has been measured or needs to be measured/re-measured.
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Eric Paris <eparis@redhat.com>
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index ac79032..08408bd 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -110,8 +110,7 @@
};
/* LIM API function definitions */
-int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
- int mask, int function);
+int ima_must_measure(struct inode *inode, int mask, int function);
int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
const unsigned char *filename);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index d3963de..da36d2c 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -105,20 +105,13 @@
* mask: contains the permission mask
* fsmagic: hex value
*
- * Must be called with iint->mutex held.
- *
- * Return 0 to measure. Return 1 if already measured.
- * For matching a DONT_MEASURE policy, no policy, or other
- * error, return an error code.
+ * Return 0 to measure. For matching a DONT_MEASURE policy, no policy,
+ * or other error, return an error code.
*/
-int ima_must_measure(struct ima_iint_cache *iint, struct inode *inode,
- int mask, int function)
+int ima_must_measure(struct inode *inode, int mask, int function)
{
int must_measure;
- if (iint && iint->flags & IMA_MEASURED)
- return 1;
-
must_measure = ima_match_policy(inode, function, mask);
return must_measure ? 0 : -EACCES;
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 2df9021..39d66dc 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -65,7 +65,7 @@
goto out;
}
- rc = ima_must_measure(NULL, inode, MAY_READ, FILE_CHECK);
+ rc = ima_must_measure(inode, MAY_READ, FILE_CHECK);
if (rc < 0)
goto out;
@@ -127,7 +127,7 @@
if (!ima_initialized || !S_ISREG(inode->i_mode))
return 0;
- rc = ima_must_measure(NULL, inode, mask, function);
+ rc = ima_must_measure(inode, mask, function);
if (rc != 0)
return rc;
retry:
@@ -141,7 +141,7 @@
mutex_lock(&iint->mutex);
- rc = ima_must_measure(iint, inode, mask, function);
+ rc = iint->flags & IMA_MEASURED ? 1 : 0;
if (rc != 0)
goto out;