gnu: gettext: Fix non-deterministic msgunfmt behavior.

Suggested by Alírio Eyng <alirioeyng@gmail.com>.

* gnu/packages/patches/gettext-msgunfmt.patch: New file.
* gnu/packages/gettext.scm (gnu-gettext)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu-system.am

@@ -431,6 +431,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/gcc-libvtv-runpath.patch			\
   gnu/packages/patches/gcc-5.0-libvtv-runpath.patch		\
   gnu/packages/patches/geoclue-config.patch			\
+  gnu/packages/patches/gettext-msgunfmt.patch			\
   gnu/packages/patches/ghostscript-runpath.patch		\
   gnu/packages/patches/gitolite-openssh-6.8-compat.patch	\
   gnu/packages/patches/glib-tests-desktop.patch			\

gnu/packages/gettext.scm

@@ -42,7 +42,8 @@ (define-public gnu-gettext
                                  version ".tar.gz"))
              (sha256
               (base32
-               "0gvz86m4cs8bdf3mwmwsyx6lrq4ydfxgadrgd9jlx32z3bnz3jca"))))
+               "0gvz86m4cs8bdf3mwmwsyx6lrq4ydfxgadrgd9jlx32z3bnz3jca"))
+             (patches (list (search-patch "gettext-msgunfmt.patch")))))
     (build-system gnu-build-system)
     (inputs
      `(("expat" ,expat)))

gnu/packages/patches/gettext-msgunfmt.patch

+From <http://git.savannah.gnu.org/cgit/gettext.git/patch/?id=5d3eeaa0d3b7f4f6932bd29d859925a940b69459>.
+
+2015-03-11  Daiki Ueno  <ueno@gnu.org>
+
+	msgunfmt: Check allocated size for static segment
+	Reported by Max Lin in:
+	http://lists.gnu.org/archive/html/bug-gettext/2015-03/msg00005.html
+	* read-mo.c (get_sysdep_string): Check if the embedded segment
+	size is valid, before adding it to the string length.
+
+diff --git a/gettext-tools/src/read-mo.c b/gettext-tools/src/read-mo.c
+index b97bbad..1c024a8 100644
+--- a/gettext-tools/src/read-mo.c
++++ b/gettext-tools/src/read-mo.c
+@@ -149,6 +149,7 @@ get_sysdep_string (const struct binary_mo_file *bfp, size_t offset,
+   nls_uint32 s_offset;
+ 
+   /* Compute the length.  */
++  s_offset = get_uint32 (bfp, offset);
+   length = 0;
+   for (i = 4; ; i += 8)
+     {
+@@ -158,9 +159,14 @@ get_sysdep_string (const struct binary_mo_file *bfp, size_t offset,
+       nls_uint32 ss_length;
+       nls_uint32 ss_offset;
+       size_t ss_end;
++      size_t s_end;
+       size_t n;
+ 
++      s_end = xsum (s_offset, segsize);
++      if (size_overflow_p (s_end) || s_end > bfp->size)
++        error (EXIT_FAILURE, 0, _("file \"%s\" is truncated"), bfp->filename);
+       length += segsize;
++      s_offset += segsize;
+ 
+       if (sysdepref == SEGMENTS_END)
+         break;
+@@ -175,7 +181,7 @@ get_sysdep_string (const struct binary_mo_file *bfp, size_t offset,
+       ss_end = xsum (ss_offset, ss_length);
+       if (size_overflow_p (ss_end) || ss_end > bfp->size)
+         error (EXIT_FAILURE, 0, _("file \"%s\" is truncated"), bfp->filename);
+-      if (!(ss_length > 0 && bfp->data[ss_offset + ss_length - 1] == '\0'))
++      if (!(ss_length > 0 && bfp->data[ss_end - 1] == '\0'))
+         {
+           char location[30];
+           sprintf (location, "sysdep_segment[%u]", (unsigned int) sysdepref);
+@@ -198,11 +204,8 @@ get_sysdep_string (const struct binary_mo_file *bfp, size_t offset,
+       nls_uint32 sysdep_segment_offset;
+       nls_uint32 ss_length;
+       nls_uint32 ss_offset;
+-      size_t s_end = xsum (s_offset, segsize);
+       size_t n;
+ 
+-      if (size_overflow_p (s_end) || s_end > bfp->size)
+-        error (EXIT_FAILURE, 0, _("file \"%s\" is truncated"), bfp->filename);
+       memcpy (p, bfp->data + s_offset, segsize);
+       p += segsize;
+       s_offset += segsize;