1 files changed, 78 insertions, 0 deletions

diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index c3254a681a78..2bdab8b11f3f 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -575,3 +575,81 @@ out_free:
         kfree(xent);
         return err;
 }
+
+static size_t security_listxattr(struct dentry *d, char *list, size_t list_size,
+                                 const char *name, size_t name_len, int flags)
+{
+        const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
+        const size_t total_len = prefix_len + name_len + 1;
+
+        if (list && total_len <= list_size) {
+                memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
+                memcpy(list + prefix_len, name, name_len);
+                list[prefix_len + name_len] = '\0';
+        }
+
+        return total_len;
+}
+
+static int security_getxattr(struct dentry *d, const char *name, void *buffer,
+                      size_t size, int flags)
+{
+        return ubifs_getxattr(d, name, buffer, size);
+}
+
+static int security_setxattr(struct dentry *d, const char *name,
+                             const void *value, size_t size, int flags,
+                             int handler_flags)
+{
+        return ubifs_setxattr(d, name, value, size, flags);
+}
+
+static const struct xattr_handler ubifs_xattr_security_handler = {
+        .prefix = XATTR_SECURITY_PREFIX,
+        .list   = security_listxattr,
+        .get    = security_getxattr,
+        .set    = security_setxattr,
+};
+
+const struct xattr_handler *ubifs_xattr_handlers[] = {
+        &ubifs_xattr_security_handler,
+        NULL,
+};
+
+static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
+                      void *fs_info)
+{
+        const struct xattr *xattr;
+        char *name;
+        int err = 0;
+
+        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+                name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
+                               strlen(xattr->name) + 1, GFP_NOFS);
+                if (!name) {
+                        err = -ENOMEM;
+                        break;
+                }
+                strcpy(name, XATTR_SECURITY_PREFIX);
+                strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+                err = setxattr(inode, name, xattr->value, xattr->value_len, 0);
+                kfree(name);
+                if (err < 0)
+                        break;
+        }
+
+        return err;
+}
+
+int ubifs_init_security(struct inode *dentry, struct inode *inode,
+                        const struct qstr *qstr)
+{
+        int err;
+
+        mutex_lock(&inode->i_mutex);
+        err = security_inode_init_security(inode, dentry, qstr,
+                                           &init_xattrs, 0);
+        mutex_unlock(&inode->i_mutex);
+
+        return err;
+}