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From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Wed, 3 Jul 2013 22:21:12 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r252632 - head/sbin/dhclient
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Author: pjd
Date: Wed Jul  3 22:21:11 2013
New Revision: 252632
URL: http://svnweb.freebsd.org/changeset/base/252632

Log:
  MFp4 @229486:
  
  Once PID is written to the pidfile, revoke all capability rights.
  We just want to keep the pidfile open.
  
  Reviewed by:	brooks
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sbin/dhclient/dhclient.c

Modified: head/sbin/dhclient/dhclient.c
==============================================================================
--- head/sbin/dhclient/dhclient.c	Wed Jul  3 22:19:43 2013	(r252631)
+++ head/sbin/dhclient/dhclient.c	Wed Jul  3 22:21:11 2013	(r252632)
@@ -2363,8 +2363,13 @@ go_daemon(void)
 	if (daemon(1, 0) == -1)
 		error("daemon");
 
-	if (pidfile != NULL)
+	if (pidfile != NULL) {
 		pidfile_write(pidfile);
+		if (cap_rights_limit(pidfile_fileno(pidfile), CAP_NONE) < 0 &&
+		    errno != ENOSYS) {
+			error("can't limit pidfile descriptor: %m");
+		}
+	}
 
 	/* we are chrooted, daemon(3) fails to open /dev/null */
 	if (nullfd != -1) {