djbdns: added upstream patch against a vulnerability in AXFR

network/djbdns/AXFR_vulnerability.patch

@@ -0,0 +1,58 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: package/.../djbdns/AXFR_vulnerability.patch
+# Copyright (C) 2009 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This patch file is dual-licensed. It is available under the license the
+# patched project is licensed under, as long as it is an OpenSource license
+# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
+# of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+Mailing-List: contact dns-help@list.cr.yp.to; run by ezmlm
+Date: 4 Mar 2009 01:34:21 -0000
+Message-ID: <20090304013421.60368.qmail@cr.yp.to>
+Mail-Followup-To: dns@list.cr.yp.to
+Automatic-Legal-Notices: See http://cr.yp.to/mailcopyright.html.
+From: "D. J. Bernstein" <djb@cr.yp.to>
+To: dns@list.cr.yp.to
+Subject: djbdns<=1.05 lets AXFRed subdomains overwrite domains
+
+If the administrator of example.com publishes the example.com DNS data
+through tinydns and axfrdns, and includes data for sub.example.com
+transferred from an untrusted third party, then that third party can
+control cache entries for example.com, not just sub.example.com. This is
+the result of a bug in djbdns pointed out by Matthew Dempsky. (In short,
+axfrdns compresses some outgoing DNS packets incorrectly.)
+
+Even though this bug affects very few users, it is a violation of the
+expected security policy in a reasonable situation, so it is a security
+hole in djbdns. Third-party DNS service is discouraged in the djbdns
+documentation but is nevertheless supported. Dempsky is hereby awarded
+$1000.
+
+The next release of djbdns will be backed by a new security guarantee.
+In the meantime, if any users are in the situation described above,
+those users are advised to apply Dempsky's patch and requested to accept
+my apologies. The patch is also recommended for other users; it corrects
+the bug without any side effects. A copy of the patch appears below.
+
+---D. J. Bernstein
+   Research Professor, Computer Science, University of Illinois at Chicago
+
+--- ./response.c.orig	2009-03-05 22:16:18.000000000 +0200
++++ ./response.c	2009-03-05 22:16:57.000000000 +0200
+@@ -34,7 +34,7 @@
+         uint16_pack_big(buf,49152 + name_ptr[i]);
+         return response_addbytes(buf,2);
+       }
+-    if (dlen <= 128)
++    if ((dlen <= 128) && (response_len < 16384))
+       if (name_num < NAMES) {
+ 	byte_copy(name[name_num],dlen,d);
+ 	name_ptr[name_num] = response_len;