--- ../restart.c.orig	2021-02-04 16:19:28.622976160 +0000
+++ ./restart.c	2021-02-04 17:49:12.448526739 +0000
@@ -230,7 +230,7 @@
 
     // restrictive permissions for the metadata file.
     // TODO: also for the mmap file eh? :P
-    mode_t oldmask = umask(~(S_IRUSR | S_IWUSR));
+    mode_t oldmask = umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
     FILE *f = fopen(metafile, "w");
     umask(oldmask);
     if (f == NULL) {