gnu: freetype: Fix CVE-2017-{8105,8287}.
* gnu/packages/patches/freetype-CVE-2017-8105.patch, gnu/packages/patches/freetype-CVE-2017-8287.patch: New files. * gnu/local.mk (dist_patch_DATA): Add them. * gnu/packages/fontutils.scm (freetype)[replacement]: New field. (freetype/fixed): New variable.master
Leo Famulari
parent
e24d527131
commit
86f48a8dbf
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@ -575,6 +575,8 @@ dist_patch_DATA = \
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%D%/packages/patches/freeimage-CVE-2015-0852.patch \
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%D%/packages/patches/freeimage-CVE-2016-5684.patch \
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%D%/packages/patches/freeimage-fix-build-with-gcc-5.patch \
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%D%/packages/patches/freetype-CVE-2017-8105.patch \
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%D%/packages/patches/freetype-CVE-2017-8287.patch \
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%D%/packages/patches/fuse-overlapping-headers.patch \
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%D%/packages/patches/gawk-shell.patch \
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%D%/packages/patches/gcc-arm-bug-71399.patch \
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@ -48,6 +48,7 @@
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(define-public freetype
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(package
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(name "freetype")
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(replacement freetype/fixed)
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(version "2.7.1")
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(source (origin
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(method url-fetch)
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@ -73,6 +74,15 @@ anti-aliased glyph bitmap generation with 256 gray levels.")
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(license license:freetype) ; some files have other licenses
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(home-page "https://www.freetype.org/")))
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(define freetype/fixed
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(package
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(inherit freetype)
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(source
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(origin
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(inherit (package-source freetype))
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(patches (search-patches "freetype-CVE-2017-8105.patch"
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"freetype-CVE-2017-8287.patch"))))))
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(define-public ttfautohint
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(package
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(name "ttfautohint")
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@ -0,0 +1,56 @@
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Fix CVE-2017-8105:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8105
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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=935
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Patch copied from upstream source repository:
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https://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=f958c48ee431bef8d4d466b40c9cb2d4dbcb7791
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From f958c48ee431bef8d4d466b40c9cb2d4dbcb7791 Mon Sep 17 00:00:00 2001
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From: Werner Lemberg <wl@gnu.org>
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Date: Fri, 24 Mar 2017 09:15:10 +0100
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Subject: [PATCH] [psaux] Better protect `flex' handling.
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Reported as
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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=935
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* src/psaux/t1decode.c (t1_decoder_parse_charstrings)
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<callothersubr>: Since there is not a single flex operator but a
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series of subroutine calls, malformed fonts can call arbitrary other
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operators after the start of a flex, possibly adding points. For
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this reason we have to check the available number of points before
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inserting a point.
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---
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ChangeLog | 15 +++++++++++++++
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src/psaux/t1decode.c | 9 +++++++++
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2 files changed, 24 insertions(+)
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diff --git a/src/psaux/t1decode.c b/src/psaux/t1decode.c
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index af7b465e..7dd45135 100644
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--- a/src/psaux/t1decode.c
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+++ b/src/psaux/t1decode.c
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@@ -780,10 +780,19 @@
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/* point without adding any point to the outline */
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idx = decoder->num_flex_vectors++;
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if ( idx > 0 && idx < 7 )
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+ {
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+ /* in malformed fonts it is possible to have other */
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+ /* opcodes in the middle of a flex (which don't */
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+ /* increase `num_flex_vectors'); we thus have to */
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+ /* check whether we can add a point */
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+ if ( FT_SET_ERROR( t1_builder_check_points( builder, 1 ) ) )
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+ goto Syntax_Error;
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+
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t1_builder_add_point( builder,
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x,
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y,
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(FT_Byte)( idx == 3 || idx == 6 ) );
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+ }
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}
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break;
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--
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2.12.2
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@ -0,0 +1,44 @@
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Fix CVE-2017-8287:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8287
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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=941
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Patch copied from upstream source repository:
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https://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=3774fc08b502c3e685afca098b6e8a195aded6a0
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From 3774fc08b502c3e685afca098b6e8a195aded6a0 Mon Sep 17 00:00:00 2001
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From: Werner Lemberg <wl@gnu.org>
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Date: Sun, 26 Mar 2017 08:32:09 +0200
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Subject: [PATCH] * src/psaux/psobjs.c (t1_builder_close_contour): Add safety
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guard.
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Reported as
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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=941
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---
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ChangeLog | 8 ++++++++
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src/psaux/psobjs.c | 8 ++++++++
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2 files changed, 16 insertions(+)
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diff --git a/src/psaux/psobjs.c b/src/psaux/psobjs.c
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index d18e821a..0baf8368 100644
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--- a/src/psaux/psobjs.c
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+++ b/src/psaux/psobjs.c
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@@ -1718,6 +1718,14 @@
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first = outline->n_contours <= 1
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? 0 : outline->contours[outline->n_contours - 2] + 1;
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+ /* in malformed fonts it can happen that a contour was started */
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+ /* but no points were added */
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+ if ( outline->n_contours && first == outline->n_points )
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+ {
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+ outline->n_contours--;
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+ return;
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+ }
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+
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/* We must not include the last point in the path if it */
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/* is located on the first point. */
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if ( outline->n_points > 1 )
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--
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2.12.2
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