[Linux-ima-user] [RFC][PATCH 08/14] evm: imbed evm_inode_post_setattr

[Mimi Z. <zo...@li...>]

Changing the inode's metadata may require the 'security.evm' extended
attribute to be re-calculated and updated.

Signed-off-by: Mimi Zohar <zo...@us...>

diff --git a/fs/attr.c b/fs/attr.c
index 96d394b..2391242 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -14,6 +14,7 @@
 #include <linux/fcntl.h>
 #include <linux/quotaops.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 
 /* Taken over from the old code... */
 
@@ -225,8 +226,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 	if (ia_valid & ATTR_SIZE)
 		up_write(&dentry->d_inode->i_alloc_sem);
 
-	if (!error)
+	if (!error) {
 		fsnotify_change(dentry, ia_valid);
+		evm_inode_post_setattr(dentry, ia_valid);
+	}
 
 	return error;
 }
diff --git a/include/linux/evm.h b/include/linux/evm.h
index 93edadd..8626263 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -15,6 +15,7 @@ extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     char *xattr_name,
 					     char *xattr_value,
 					     size_t xattr_value_len);
+extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
 extern int evm_inode_setxattr(struct dentry *dentry, const char *name,
 			      const void *value, size_t size);
 extern void evm_inode_post_setxattr(struct dentry *dentry,
@@ -33,6 +34,11 @@ static enum integrity_status evm_verifyxattr(struct dentry *dentry,
 	return INTEGRITY_UNKNOWN;
 }
 
+static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+{
+	return;
+}
+
 static inline int evm_inode_setxattr(struct dentry *dentry, const char *name,
 				     const void *value, size_t size)
 {
-- 
1.6.6