fix lock file open mode, set umask to 022

Author: lcn2

mach_dep.c

@@ -430,7 +430,7 @@ lock_sc(void)
      * open lock file if not already open
      */
     if (lock_fd < 0) {
-	lock_fd = open(lock_path, O_RDWR|O_CREAT);
+	lock_fd = open(lock_path, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); /* more 0644 */
 	if (lock_fd < 0) {
 	    /* failed to open and/or create the lock file */
 	    fprintf(stderr, "\nERROR: failed to open lock file: %s\n", lock_path);

main.c

@@ -13,6 +13,7 @@
 #include <signal.h>
 #include <time.h>
 #include <ncurses.h>
+#include <sys/stat.h>
 #include "rogue.h"
 #include "score.h"
 
@@ -28,6 +29,11 @@ main(int argc, char **argv)
     char *env;
     time_t lowtime;
 
+    /*
+     * set mode for write access for the owner only
+     */
+    (void) umask(S_IWGRP | S_IWOTH);
+
     md_init();
 
 #ifdef MASTER