03/03: gnu: ghostscript: Fix CVE-2018-10194.

[Leo Famulari]

lfam pushed a commit to branch master
in repository guix.

commit a1e3da63cb4b9a9151849d1d4360c2a8415becb5
Author: Leo Famulari <address@hidden>
Date:   Mon Jul 16 23:09:37 2018 -0400

    gnu: ghostscript: Fix CVE-2018-10194.
    
    * gnu/packages/ghostscript.scm (ghostscript)[replacement]: New field.
    (ghostscript/fixed): New variable.
    * gnu/packages/patches/ghostscript-CVE-2018-10194.patch: New file.
    * gnu/local.mk (dist_patch_DATA): Add it.
---
 gnu/local.mk                                       |  1 +
 gnu/packages/ghostscript.scm                       | 11 +++++
 .../patches/ghostscript-CVE-2018-10194.patch       | 52 ++++++++++++++++++++++
 3 files changed, 64 insertions(+)

diff --git a/gnu/local.mk b/gnu/local.mk
index 6a731ea..e55c2bf 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -714,6 +714,7 @@ dist_patch_DATA =                                           
\
   %D%/packages/patches/geoclue-config.patch                    \
   %D%/packages/patches/ghc-8.0-fall-back-to-madv_dontneed.patch \
   %D%/packages/patches/ghc-dont-pass-linker-flags-via-response-files.patch     
\
+  %D%/packages/patches/ghostscript-CVE-2018-10194.patch                \
   %D%/packages/patches/ghostscript-no-header-id.patch          \
   %D%/packages/patches/ghostscript-no-header-uuid.patch                \
   %D%/packages/patches/ghostscript-no-header-creationdate.patch \
diff --git a/gnu/packages/ghostscript.scm b/gnu/packages/ghostscript.scm
index 0a6043b..1240b1d 100644
--- a/gnu/packages/ghostscript.scm
+++ b/gnu/packages/ghostscript.scm
@@ -132,6 +132,7 @@ printing, and psresize, for adjusting page sizes.")
 (define-public ghostscript
   (package
     (name "ghostscript")
+    (replacement ghostscript/fixed)
     (version "9.23")
     (source
       (origin
@@ -250,6 +251,16 @@ output file formats and printers.")
     (home-page "https://www.ghostscript.com/";)
     (license license:agpl3+)))
 
+(define-public ghostscript/fixed
+  (hidden-package
+    (package
+      (inherit ghostscript)
+      (source
+        (origin
+          (inherit (package-source ghostscript))
+          (patches (append (origin-patches (package-source ghostscript))
+                           (search-patches 
"ghostscript-CVE-2018-10194.patch"))))))))
+
 (define-public ghostscript/x
   (package/inherit ghostscript
     (name (string-append (package-name ghostscript) "-with-x"))
diff --git a/gnu/packages/patches/ghostscript-CVE-2018-10194.patch 
b/gnu/packages/patches/ghostscript-CVE-2018-10194.patch
new file mode 100644
index 0000000..242e57c
--- /dev/null
+++ b/gnu/packages/patches/ghostscript-CVE-2018-10194.patch
@@ -0,0 +1,52 @@
+Fix CVE-2018-10194:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10194
+https://bugs.ghostscript.com/show_bug.cgi?id=699255
+
+Patch copied from upstream source repository:
+
+https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=39b1e54b2968620723bf32e96764c88797714879
+
+From 39b1e54b2968620723bf32e96764c88797714879 Mon Sep 17 00:00:00 2001
+From: Ken Sharp <address@hidden>
+Date: Wed, 18 Apr 2018 15:46:32 +0100
+Subject: [PATCH] pdfwrite - Guard against trying to output an infinite number
+
+Bug #699255 " Buffer overflow on pprintg1 due to mishandle postscript file 
data to pdf"
+
+The file uses an enormous parameter to xyxhow, causing an overflow in
+the calculation of text positioning (value > 1e39).
+
+Since this is basically a nonsense value, and PostScript only supports
+real values up to 1e38, this patch follows the same approach as for
+a degenerate CTM, and treats it as 0.
+
+Adobe Acrobat Distiller throws a limitcheck error, so we could do that
+instead if this approach proves to be a problem.
+---
+ devices/vector/gdevpdts.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/devices/vector/gdevpdts.c b/devices/vector/gdevpdts.c
+index 848ad781f..172fe6bc3 100644
+--- a/devices/vector/gdevpdts.c
++++ b/devices/vector/gdevpdts.c
+@@ -103,9 +103,14 @@ append_text_move(pdf_text_state_t *pts, double dw)
+ static int
+ set_text_distance(gs_point *pdist, double dx, double dy, const gs_matrix 
*pmat)
+ {
+-    int code = gs_distance_transform_inverse(dx, dy, pmat, pdist);
++    int code;
+     double rounded;
+ 
++    if (dx > 1e38 || dy > 1e38)
++        code = gs_error_undefinedresult;
++    else
++        code = gs_distance_transform_inverse(dx, dy, pmat, pdist);
++
+     if (code == gs_error_undefinedresult) {
+         /* The CTM is degenerate.
+            Can't know the distance in user space.
+-- 
+2.18.0
+