gnu: imagemagick: Fix CVE-2016-5118.

* gnu/packages/patches/imagemagick-CVE-2016-5118.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/imagemagick.scm (imagemagick): Use it.

gnu/local.mk

@@ -552,6 +552,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/icu4c-CVE-2015-4760.patch		\
   %D%/packages/patches/id3lib-CVE-2007-4460.patch			\
   %D%/packages/patches/ilmbase-fix-tests.patch			\
+  %D%/packages/patches/imagemagick-CVE-2016-5118.patch		\
   %D%/packages/patches/inkscape-drop-wait-for-targets.patch	\
   %D%/packages/patches/irrlicht-mesa-10.patch			\
   %D%/packages/patches/jansson-CVE-2016-4425.patch		\

gnu/packages/imagemagick.scm

@@ -46,6 +46,7 @@
              (method url-fetch)
              (uri (string-append "mirror://imagemagick/ImageMagick-"
                                  version ".tar.xz"))
+             (patches (search-patches "imagemagick-CVE-2016-5118.patch"))
              (sha256
               (base32
                "0niwa7ci50865x1h6qffz1q6i2ph2l5ym7bhcg5kdnvi4f75p9ir"))))

gnu/packages/patches/imagemagick-CVE-2016-5118.patch

@@ -0,0 +1,29 @@
+From c0c5c9fc7271fd141531b0bdb55b7f7ff5afc481 Mon Sep 17 00:00:00 2001
+From: Leo Famulari <leo@famulari.name>
+Date: Tue, 31 May 2016 13:06:10 -0400
+Subject: [PATCH] Fix CVE-2016-5118.
+
+This is the temporary fix suggested by upstream:
+https://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=29803#p134039
+---
+ magick/magick-baseconfig.h | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/magick/magick-baseconfig.h b/magick/magick-baseconfig.h
+index d320f2a..c9cce82 100644
+--- a/magick/magick-baseconfig.h
++++ b/magick/magick-baseconfig.h
+@@ -519,7 +519,10 @@
+ 
+ /* Define to 1 if you have the `popen' function. */
+ #ifndef MAGICKCORE_HAVE_POPEN
++/* Temporary mitigation for CVE-2016-5118 (popen() shell vulnerability via
++ * filename)
+ #define MAGICKCORE_HAVE_POPEN 1
++*/
+ #endif
+ 
+ /* Define to 1 if you have the `posix_fadvise' function. */
+-- 
+2.8.3
+