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gnu: gdk-pixbuf: Fix CVE-2020-29385.

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* gnu/packages/patches/gdk-pixbuf-CVE-2020-29385.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gtk.scm (gdk-pixbuf)[replacement]: New field.
(gdk-pixbuf/fixed): New variable.
(gdk-pixbuf+svg): Use package/inherit.
This commit is contained in:
Mark H Weaver 2021-03-12 03:51:45 -05:00
parent 57853d69fe
commit 453e101fc3
No known key found for this signature in database
GPG Key ID: 7CEF29847562C516
3 changed files with 66 additions and 2 deletions
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1
gnu/local.mk
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@ -1056,6 +1056,7 @@ dist_patch_DATA = \
%D%/packages/patches/gdb-hurd.patch \
%D%/packages/patches/gd-fix-tests-on-i686.patch \
%D%/packages/patches/gd-brect-bounds.patch \
%D%/packages/patches/gdk-pixbuf-CVE-2020-29385.patch \
%D%/packages/patches/gdm-default-session.patch \
%D%/packages/patches/geary-CVE-2020-24661.patch \
%D%/packages/patches/genimage-signedness.patch \

14
gnu/packages/gtk.scm
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@ -1,7 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2017, 2018, 2019 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014, 2015, 2017, 2018, 2019, 2021 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
;;; Copyright © 2015 Paul van der Walt <paul@denknerd.org>
@ -557,6 +557,7 @@ highlighting and other features typical of a source code editor.")
(package
(name "gdk-pixbuf")
(version "2.40.0")
(replacement gdk-pixbuf/fixed)
(source (origin
(method url-fetch)
(uri (string-append "mirror://gnome/sources/" name "/"
@ -613,11 +614,20 @@ in the GNOME project.")
(license license:lgpl2.0+)
(home-page "https://developer.gnome.org/gdk-pixbuf/")))
(define gdk-pixbuf/fixed
(package
(inherit gdk-pixbuf)
(source (origin
(inherit (package-source gdk-pixbuf))
(patches
(append (search-patches "gdk-pixbuf-CVE-2020-29385.patch")
(origin-patches (package-source gdk-pixbuf))))))))
;; To build gdk-pixbuf with SVG support, we need librsvg, and librsvg depends
;; on gdk-pixbuf, so this new varibale. Also, librsvg adds 90MiB to the
;; closure size.
(define-public gdk-pixbuf+svg
(package (inherit gdk-pixbuf)
(package/inherit gdk-pixbuf
(name "gdk-pixbuf+svg")
(inputs
`(("librsvg" ,librsvg)

53
gnu/packages/patches/gdk-pixbuf-CVE-2020-29385.patch Normal file
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@ -0,0 +1,53 @@
Fix CVE-2020-29385. Note that we omit the binary test file
tests/test-images/fail/hang_114.gif from the following commit, to avoid
requiring 'git' to apply the patch.
From bdd3acbd48a575d418ba6bf1b32d7bda2fae1c81 Mon Sep 17 00:00:00 2001
From: Robert Ancell <robert.ancell@canonical.com>
Date: Mon, 30 Nov 2020 12:26:12 +1300
Subject: [PATCH] gif: Fix LZW decoder accepting invalid LZW code.
The code value after a reset wasn't being validated, which means we would
accept invalid codes. This could cause an infinite loop in the decoder.
Fixes CVE-2020-29385
Fixes https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/164
---
gdk-pixbuf/lzw.c | 13 +++++++------
tests/test-images/fail/hang_114.gif | Bin 0 -> 5561 bytes
2 files changed, 7 insertions(+), 6 deletions(-)
create mode 100644 tests/test-images/fail/hang_114.gif
diff --git a/gdk-pixbuf/lzw.c b/gdk-pixbuf/lzw.c
index 9e052a6f7..105daf2b1 100644
--- a/gdk-pixbuf/lzw.c
+++ b/gdk-pixbuf/lzw.c
@@ -195,19 +195,20 @@ lzw_decoder_feed (LZWDecoder *self,
if (self->last_code != self->clear_code && self->code_table_size < MAX_CODES) {
if (self->code < self->code_table_size)
add_code (self, self->code);
- else if (self->code == self->code_table_size)
+ else
add_code (self, self->last_code);
- else {
- /* Invalid code received - just stop here */
- self->last_code = self->eoi_code;
- return output_length;
- }
/* When table is full increase code size */
if (self->code_table_size == (1 << self->code_size) && self->code_size < LZW_CODE_MAX)
self->code_size++;
}
+ /* Invalid code received - just stop here */
+ if (self->code >= self->code_table_size) {
+ self->last_code = self->eoi_code;
+ return output_length;
+ }
+
/* Convert codeword into indexes */
n_written += write_indexes (self, output + n_written, output_length - n_written);
}