Index: shadow-4.5/lib/commonio.c

===================================================================

--- shadow-4.5.orig/lib/commonio.c

+++ shadow-4.5/lib/commonio.c

@@ -140,7 +140,10 @@ static int do_lock_file (const char *fil

 	int retval;

 	char buf[32];

-	fd = open (file, O_CREAT | O_EXCL | O_WRONLY, 0600);

+	/* We depend here on the fact, that the file name is pid-specific.

+	 * So no O_EXCL here and no DoS.

+	 */

+	fd = open (file, O_CREAT | O_TRUNC | O_WRONLY, 0600);

 	if (-1 == fd) {

 		if (log) {

 			(void) fprintf (stderr,