2 files changed, 6 insertions, 0 deletions
diff --git a/src/bindfs.1 b/src/bindfs.1
index 8a92246..b45b79d 100644
--- a/src/bindfs.1
+++ b/src/bindfs.1
@@ -63,6 +63,8 @@ right of a slash in the list of mappings.
 Currently, the options \fB--user\fP, \fB--group\fP, \fB--mirror\fP and
 \fB--create-for-*\fP override the corresponding behavior of this option.
 
+Requires mounting as root.
+
 
 .SH FILE CREATION POLICY
 New files and directories are created so they are owned by the mounter.
diff --git a/src/bindfs.c b/src/bindfs.c
index 24d4f53..897ae01 100644
--- a/src/bindfs.c
+++ b/src/bindfs.c
@@ -1429,6 +1429,10 @@ int main(int argc, char *argv[])
     
     /* Parse usermap */
     if (od.map) {
+        if (getuid() != 0) {
+            fprintf(stderr, "Error: You need to be root to use --map !\n", od.group);
+            return 1;
+        }
         if (!parse_user_map(settings.usermap, settings.usermap_reverse, od.map)) {
             /* parse_user_map printed an error */
             return 1;