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From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Wed, 3 Jul 2013 22:22:29 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r252633 - head/sbin/dhclient
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Author: pjd
Date: Wed Jul  3 22:22:29 2013
New Revision: 252633
URL: http://svnweb.freebsd.org/changeset/base/252633

Log:
  MFp4 @229487:
  
  Revoke all capability rights from STDIN and allow only for write to STDOUT and
  STDERR. All those descriptors are redirected to /dev/null.
  
  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 22:21:11 2013	(r252632)
+++ head/sbin/dhclient/dhclient.c	Wed Jul  3 22:22:29 2013	(r252633)
@@ -2379,6 +2379,13 @@ go_daemon(void)
 		close(nullfd);
 		nullfd = -1;
 	}
+
+	if (cap_rights_limit(STDIN_FILENO, CAP_NONE) < 0 && errno != ENOSYS)
+		error("can't limit stdin: %m");
+	if (cap_rights_limit(STDOUT_FILENO, CAP_WRITE) < 0 && errno != ENOSYS)
+		error("can't limit stdout: %m");
+	if (cap_rights_limit(STDERR_FILENO, CAP_WRITE) < 0 && errno != ENOSYS)
+		error("can't limit stderr: %m");
 }
 
 int