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Diffstat (limited to 'security/integrity/ima/ima_main.c')
-rw-r--r--security/integrity/ima/ima_main.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 68b26c340acd..596ef616ac21 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -125,6 +125,7 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint,
if ((iint->version != inode->i_version) ||
(iint->flags & IMA_NEW_FILE)) {
iint->flags &= ~(IMA_DONE_MASK | IMA_NEW_FILE);
+ iint->measured_pcrs = 0;
if (iint->flags & IMA_APPRAISE)
ima_update_xattr(iint, file);
}
@@ -162,6 +163,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
char *pathbuf = NULL;
const char *pathname = NULL;
int rc = -ENOMEM, action, must_appraise;
+ int pcr = CONFIG_IMA_MEASURE_PCR_IDX;
struct evm_ima_xattr_data *xattr_value = NULL;
int xattr_len = 0;
bool violation_check;
@@ -174,7 +176,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
* bitmask based on the appraise/audit/measurement policy.
* Included is the appraise submask.
*/
- action = ima_get_action(inode, mask, func);
+ action = ima_get_action(inode, mask, func, &pcr);
violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
(ima_policy_flag & IMA_MEASURE));
if (!action && !violation_check)
@@ -209,7 +211,11 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
*/
iint->flags |= action;
action &= IMA_DO_MASK;
- action &= ~((iint->flags & IMA_DONE_MASK) >> 1);
+ action &= ~((iint->flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1);
+
+ /* If target pcr is already measured, unset IMA_MEASURE action */
+ if ((action & IMA_MEASURE) && (iint->measured_pcrs & (0x1 << pcr)))
+ action ^= IMA_MEASURE;
/* Nothing to do, just return existing appraised status */
if (!action) {
@@ -238,7 +244,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
if (action & IMA_MEASURE)
ima_store_measurement(iint, file, pathname,
- xattr_value, xattr_len);
+ xattr_value, xattr_len, pcr);
if (action & IMA_APPRAISE_SUBMASK)
rc = ima_appraise_measurement(func, iint, file, pathname,
xattr_value, xattr_len, opened);