cracklib: Fix buffer overflow

[Leo Famulari]

This patch cherry-picks an upstream commit to fix a buffer overflow in
cracklib. Please see the patch file for more information about the bug.

From 62f8f1763ba1766e92e8dc05686bd9353eaf2ad5 Mon Sep 17 00:00:00 2001
From: Leo Famulari <l...@famulari.name>
Date: Thu, 15 Sep 2016 11:34:49 -0400
Subject: [PATCH] gnu: cracklib: Fix buffer overflow.

* gnu/packages/patches/cracklib-fix-buffer-overflow.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/password-utils.scm (cracklib)[source]: Use it.
---
 gnu/local.mk                                       |  1 +
 gnu/packages/password-utils.scm                    |  3 +-
 .../patches/cracklib-fix-buffer-overflow.patch     | 39 ++++++++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/cracklib-fix-buffer-overflow.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index a7006cb..ab052af 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -473,6 +473,7 @@ dist_patch_DATA =                                           
\
   %D%/packages/patches/cpio-CVE-2016-2037.patch                        \
   %D%/packages/patches/cpufrequtils-fix-aclocal.patch          \
   %D%/packages/patches/cracklib-CVE-2016-6318.patch            \
+  %D%/packages/patches/cracklib-fix-buffer-overflow.patch      \
   %D%/packages/patches/crda-optional-gcrypt.patch              \
   %D%/packages/patches/crossmap-allow-system-pysam.patch       \
   %D%/packages/patches/csound-header-ordering.patch            \
diff --git a/gnu/packages/password-utils.scm b/gnu/packages/password-utils.scm
index 7288da6..40ed933 100644
--- a/gnu/packages/password-utils.scm
+++ b/gnu/packages/password-utils.scm
@@ -160,7 +160,8 @@ and vice versa.")
               (uri (string-append "https://github.com/cracklib/cracklib/";
                                   "releases/download/" name "-" version "/"
                                   name "-" version ".tar.gz"))
-              (patches (search-patches "cracklib-CVE-2016-6318.patch"))
+              (patches (search-patches "cracklib-CVE-2016-6318.patch"
+                                       "cracklib-fix-buffer-overflow.patch"))
               (sha256
                (base32
                 "0hrkb0prf7n92w6rxgq0ilzkk6rkhpys2cfqkrbzswp27na7dkqp"))))
diff --git a/gnu/packages/patches/cracklib-fix-buffer-overflow.patch 
b/gnu/packages/patches/cracklib-fix-buffer-overflow.patch
new file mode 100644
index 0000000..b1c990f
--- /dev/null
+++ b/gnu/packages/patches/cracklib-fix-buffer-overflow.patch
@@ -0,0 +1,39 @@
+Fix buffer overflow processing long words in Mangle().
+
+Patch adpated from upstream commit, omitting changes to 'NEWS':
+
+https://github.com/cracklib/cracklib/commit/33d7fa4585247cd2247a1ffa032ad245836c6edb
+
+From 33d7fa4585247cd2247a1ffa032ad245836c6edb Mon Sep 17 00:00:00 2001
+From: Jan Dittberner <j...@dittberner.info>
+Date: Thu, 25 Aug 2016 17:17:53 +0200
+Subject: [PATCH] Fix a buffer overflow processing long words
+
+A buffer overflow processing long words has been discovered. This commit
+applies the patch from
+https://build.opensuse.org/package/view_file/Base:System/cracklib/0004-overflow-processing-long-words.patch
+by Howard Guo.
+
+See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=835386 and
+http://www.openwall.com/lists/oss-security/2016/08/23/8
+---
+ src/NEWS        | 1 +
+ src/lib/rules.c | 5 ++---
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/lib/rules.c b/src/lib/rules.c
+index d193cc0..3a2aa46 100644
+--- a/lib/rules.c
++++ b/lib/rules.c
+@@ -434,9 +434,8 @@ Mangle(input, control)             /* returns a pointer to 
a controlled Mangle */
+ {
+     int limit;
+     register char *ptr;
+-    static char area[STRINGSIZE];
+-    char area2[STRINGSIZE];
+-    area[0] = '\0';
++    static char area[STRINGSIZE * 2] = {0};
++    char area2[STRINGSIZE * 2] = {0};
+     strcpy(area, input);
+ 
+     for (ptr = control; *ptr; ptr++)
-- 
2.10.0

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