gnu: cairo: Fix CVE-2016-9082.

* gnu/packages/gtk.scm (cairo)[replacement]: New field.
(cairo/fixed): New variable.
(cairo-xcb)[source]: Use patch.
[replacement]: New field, set false.
* gnu/packages/pdf.scm (poppler)[inputs]: Custom cairo should be
replaced by a new custom patched cairo.
* gnu/packages/patches/cairo-CVE-2016-9082.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -489,6 +489,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/binutils-loongson-workaround.patch	\
   %D%/packages/patches/binutils-mips-bash-bug.patch		\
   %D%/packages/patches/byobu-writable-status.patch		\
+  %D%/packages/patches/cairo-CVE-2016-9082.patch			\
   %D%/packages/patches/calibre-drop-unrar.patch			\
   %D%/packages/patches/calibre-no-updates-dialog.patch		\
   %D%/packages/patches/cdparanoia-fpic.patch			\

gnu/packages/gtk.scm

@@ -100,6 +100,7 @@ tools have full access to view and control running applications.")
 (define-public cairo
   (package
    (name "cairo")
+   (replacement cairo/fixed)
    (version "1.14.6")
    (source (origin
             (method url-fetch)
@@ -153,6 +154,10 @@ affine transformation (scale, rotation, shear, etc.).")
   (package
     (inherit cairo)
     (name "cairo-xcb")
+    (source (origin
+              (inherit (package-source cairo))
+              (patches (search-patches "cairo-CVE-2016-9082.patch"))))
+    (replacement #f)
     (inputs
      `(("mesa" ,mesa)
        ,@(package-inputs cairo)))
@@ -162,6 +167,13 @@ affine transformation (scale, rotation, shear, etc.).")
        '("--enable-xlib-xcb" "--enable-gl" "--enable-egl")))
     (synopsis "2D graphics library (with X11 support)")))
 
+(define cairo/fixed
+  (package
+    (inherit cairo)
+    (source (origin
+              (inherit (package-source cairo))
+              (patches (search-patches "cairo-CVE-2016-9082.patch"))))))
+
 (define-public harfbuzz
   (package
    (name "harfbuzz")

gnu/packages/patches/cairo-CVE-2016-9082.patch

@@ -0,0 +1,122 @@
+From: Adrian Johnson <ajohnson@redneon.com>
+Date: Thu, 20 Oct 2016 21:12:30 +1030
+Subject: [PATCH] image: prevent invalid ptr access for > 4GB images
+
+Image data is often accessed using:
+
+  image->data + y * image->stride
+
+On 64-bit achitectures if the image data is > 4GB, this computation
+will overflow since both y and stride are 32-bit types.
+
+bug report: https://bugs.freedesktop.org/show_bug.cgi?id=98165
+patch: https://bugs.freedesktop.org/attachment.cgi?id=127421
+---
+ boilerplate/cairo-boilerplate.c     | 4 +++-
+ src/cairo-image-compositor.c        | 4 ++--
+ src/cairo-image-surface-private.h   | 2 +-
+ src/cairo-mesh-pattern-rasterizer.c | 2 +-
+ src/cairo-png.c                     | 2 +-
+ src/cairo-script-surface.c          | 3 ++-
+ 6 files changed, 10 insertions(+), 7 deletions(-)
+
+diff --git a/boilerplate/cairo-boilerplate.c b/boilerplate/cairo-boilerplate.c
+index 7fdbf79..4804dea 100644
+--- a/boilerplate/cairo-boilerplate.c
++++ b/boilerplate/cairo-boilerplate.c
+@@ -42,6 +42,7 @@
+ #undef CAIRO_VERSION_H
+ #include "../cairo-version.h"
+ 
++#include <stddef.h>
+ #include <stdlib.h>
+ #include <ctype.h>
+ #include <assert.h>
+@@ -976,7 +977,8 @@ cairo_surface_t *
+ cairo_boilerplate_image_surface_create_from_ppm_stream (FILE *file)
+ {
+     char format;
+-    int width, height, stride;
++    int width, height;
++    ptrdiff_t stride;
+     int x, y;
+     unsigned char *data;
+     cairo_surface_t *image = NULL;
+diff --git a/src/cairo-image-compositor.c b/src/cairo-image-compositor.c
+index 48072f8..3ca0006 100644
+--- a/src/cairo-image-compositor.c
++++ b/src/cairo-image-compositor.c
+@@ -1575,7 +1575,7 @@ typedef struct _cairo_image_span_renderer {
+     pixman_image_t *src, *mask;
+     union {
+ 	struct fill {
+-	    int stride;
++	    ptrdiff_t stride;
+ 	    uint8_t *data;
+ 	    uint32_t pixel;
+ 	} fill;
+@@ -1594,7 +1594,7 @@ typedef struct _cairo_image_span_renderer {
+ 	struct finish {
+ 	    cairo_rectangle_int_t extents;
+ 	    int src_x, src_y;
+-	    int stride;
++	    ptrdiff_t stride;
+ 	    uint8_t *data;
+ 	} mask;
+     } u;
+diff --git a/src/cairo-image-surface-private.h b/src/cairo-image-surface-private.h
+index 8ca694c..7e78d61 100644
+--- a/src/cairo-image-surface-private.h
++++ b/src/cairo-image-surface-private.h
+@@ -71,7 +71,7 @@ struct _cairo_image_surface {
+ 
+     int width;
+     int height;
+-    int stride;
++    ptrdiff_t stride;
+     int depth;
+ 
+     unsigned owns_data : 1;
+diff --git a/src/cairo-mesh-pattern-rasterizer.c b/src/cairo-mesh-pattern-rasterizer.c
+index 1b63ca8..e7f0db6 100644
+--- a/src/cairo-mesh-pattern-rasterizer.c
++++ b/src/cairo-mesh-pattern-rasterizer.c
+@@ -470,7 +470,7 @@ draw_pixel (unsigned char *data, int width, int height, int stride,
+ 	tg += tg >> 16;
+ 	tb += tb >> 16;
+ 
+-	*((uint32_t*) (data + y*stride + 4*x)) = ((ta << 16) & 0xff000000) |
++	*((uint32_t*) (data + y*(ptrdiff_t)stride + 4*x)) = ((ta << 16) & 0xff000000) |
+ 	    ((tr >> 8) & 0xff0000) | ((tg >> 16) & 0xff00) | (tb >> 24);
+     }
+ }
+diff --git a/src/cairo-png.c b/src/cairo-png.c
+index 562b743..aa8c227 100644
+--- a/src/cairo-png.c
++++ b/src/cairo-png.c
+@@ -673,7 +673,7 @@ read_png (struct png_read_closure_t *png_closure)
+     }
+ 
+     for (i = 0; i < png_height; i++)
+-        row_pointers[i] = &data[i * stride];
++        row_pointers[i] = &data[i * (ptrdiff_t)stride];
+ 
+     png_read_image (png, row_pointers);
+     png_read_end (png, info);
+diff --git a/src/cairo-script-surface.c b/src/cairo-script-surface.c
+index ea0117d..91e4baa 100644
+--- a/src/cairo-script-surface.c
++++ b/src/cairo-script-surface.c
+@@ -1202,7 +1202,8 @@ static cairo_status_t
+ _write_image_surface (cairo_output_stream_t *output,
+ 		      const cairo_image_surface_t *image)
+ {
+-    int stride, row, width;
++    int row, width;
++    ptrdiff_t stride;
+     uint8_t row_stack[CAIRO_STACK_BUFFER_SIZE];
+     uint8_t *rowdata;
+     uint8_t *data;
+-- 
+2.1.4
+

gnu/packages/pdf.scm

@@ -95,6 +95,17 @@
              ;; To build poppler-glib (as needed by Evince), we need Cairo and
              ;; GLib.  But of course, that Cairo must not depend on Poppler.
              ("cairo" ,(package (inherit cairo)
+                         (replacement
+                           (package
+                             (inherit cairo)
+                             (replacement #f)
+                             (source
+                               (origin
+                                 (inherit (package-source cairo))
+                                 (patches (search-patches
+                                            "cairo-CVE-2016-9082.patch"))))
+                             (inputs (alist-delete "poppler"
+                                                   (package-inputs cairo)))))
                          (inputs (alist-delete "poppler"
                                                (package-inputs cairo)))))
              ("glib" ,glib)))