ima: fix erroneous removal of security.ima xattr

ima_inode_post_setattr() calls ima_must_appraise() to check if the file needs to be appraised. If it does not then it removes security.ima xattr. With original policy matching code it might happen that even file needs to be appraised with FILE_CHECK hook, it might not be for POST_SETATTR hook. 'security.ima' might be erronously removed. This patch treats POST_SETATTR as special wildcard function and will cause ima_must_appraise() to be true if any of the hooks rules matches. security.ima will not be removed if any of the hooks would require appraisal. Signed-off-by: Dmitry Kasatkin <[email protected]> Signed-off-by: Mimi Zohar <[email protected]>
ambv · Mar 7, 2014 · 09b1148 · 09b1148
1 parent 20ee451
commit 09b1148
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
@@ -167,9 +167,11 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
 	const struct cred *cred = current_cred();
 	int i;
 
-	if ((rule->flags & IMA_FUNC) && rule->func != func)
+	if ((rule->flags & IMA_FUNC) &&
+	    (rule->func != func && func != POST_SETATTR))
 		return false;
-	if ((rule->flags & IMA_MASK) && rule->mask != mask)
+	if ((rule->flags & IMA_MASK) &&
+	    (rule->mask != mask && func != POST_SETATTR))
 		return false;
 	if ((rule->flags & IMA_FSMAGIC)
 	    && rule->fsmagic != inode->i_sb->s_magic)