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gnu: libxfont: Fix CVE-2017-13720, CVE-2017-13722.

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* gnu/packages/patches/libxfont-CVE-2017-13720.patch,
  gnu/packages/patches/libxfont-CVE-2017-13722.patch: New files.
* gnu/local.mk (dist_patch_DATA): Register them.
* gnu/packages/xorg.scm (libxfont, libxfont2)[source]: Use them.
This commit is contained in:
Marius Bakke 2017-10-10 19:34:02 +02:00
parent 1066696dcc
commit 97ecd75e28
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GPG key ID: A2A06DF2A33A54FA
4 changed files with 95 additions and 0 deletions
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2
gnu/local.mk
View file

@ -818,6 +818,8 @@ dist_patch_DATA = \
%D%/packages/patches/libvisio-fix-tests.patch \
%D%/packages/patches/libvpx-CVE-2016-2818.patch \
%D%/packages/patches/libxcb-python-3.5-compat.patch \
%D%/packages/patches/libxfont-CVE-2017-13720.patch \
%D%/packages/patches/libxfont-CVE-2017-13722.patch \
%D%/packages/patches/libxml2-CVE-2016-4658.patch \
%D%/packages/patches/libxml2-CVE-2016-5131.patch \
%D%/packages/patches/libxml2-CVE-2017-0663.patch \

36
gnu/packages/patches/libxfont-CVE-2017-13720.patch Normal file
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@ -0,0 +1,36 @@
Fix CVE-2017-13720.
Copied from upstream source repository:
<https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608>
From d1e670a4a8704b8708e493ab6155589bcd570608 Mon Sep 17 00:00:00 2001
From: Michal Srb <msrb@suse.com>
Date: Thu, 20 Jul 2017 13:38:53 +0200
Subject: Check for end of string in PatternMatch (CVE-2017-13720)
If a pattern contains '?' character, any character in the string is skipped,
even if it is '\0'. The rest of the matching then reads invalid memory.
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Julien Cristau <jcristau@debian.org>
diff --git a/src/fontfile/fontdir.c b/src/fontfile/fontdir.c
index 4ce2473..996b7d1 100644
--- a/src/fontfile/fontdir.c
+++ b/src/fontfile/fontdir.c
@@ -400,8 +400,10 @@ PatternMatch(char *pat, int patdashes, char *string, int stringdashes)
}
}
case '?':
- if (*string++ == XK_minus)
+ if ((t = *string++) == XK_minus)
stringdashes--;
+ if (!t)
+ return 0;
break;
case '\0':
return (*string == '\0');
--
cgit v0.10.2

53
gnu/packages/patches/libxfont-CVE-2017-13722.patch Normal file
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@ -0,0 +1,53 @@
Fix CVE-2017-13722.
Copied from upstream source repository:
<https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=672bb944311392e2415b39c0d63b1e1902905bcd>
From 672bb944311392e2415b39c0d63b1e1902905bcd Mon Sep 17 00:00:00 2001
From: Michal Srb <msrb@suse.com>
Date: Thu, 20 Jul 2017 17:05:23 +0200
Subject: pcfGetProperties: Check string boundaries (CVE-2017-13722)
Without the checks a malformed PCF file can cause the library to make
atom from random heap memory that was behind the `strings` buffer.
This may crash the process or leak information.
Signed-off-by: Julien Cristau <jcristau@debian.org>
diff --git a/src/bitmap/pcfread.c b/src/bitmap/pcfread.c
index dab1c44..ae34c28 100644
--- a/src/bitmap/pcfread.c
+++ b/src/bitmap/pcfread.c
@@ -45,6 +45,7 @@ from The Open Group.
#include <stdarg.h>
#include <stdint.h>
+#include <string.h>
void
pcfError(const char* message, ...)
@@ -311,11 +312,19 @@ pcfGetProperties(FontInfoPtr pFontInfo, FontFilePtr file,
if (IS_EOF(file)) goto Bail;
position += string_size;
for (i = 0; i < nprops; i++) {
+ if (props[i].name >= string_size) {
+ pcfError("pcfGetProperties(): String starts out of bounds (%ld/%d)\n", props[i].name, string_size);
+ goto Bail;
+ }
props[i].name = MakeAtom(strings + props[i].name,
- strlen(strings + props[i].name), TRUE);
+ strnlen(strings + props[i].name, string_size - props[i].name), TRUE);
if (isStringProp[i]) {
+ if (props[i].value >= string_size) {
+ pcfError("pcfGetProperties(): String starts out of bounds (%ld/%d)\n", props[i].value, string_size);
+ goto Bail;
+ }
props[i].value = MakeAtom(strings + props[i].value,
- strlen(strings + props[i].value), TRUE);
+ strnlen(strings + props[i].value, string_size - props[i].value), TRUE);
}
}
free(strings);
--
cgit v0.10.2

4
gnu/packages/xorg.scm
View file

@ -4862,6 +4862,8 @@ (define-public libxfont
"mirror://xorg/individual/lib/libXfont-"
version
".tar.bz2"))
(patches (search-patches "libxfont-CVE-2017-13720.patch"
"libxfont-CVE-2017-13722.patch"))
(sha256
(base32
"0w8d07bkmjiarkx09579bl8zsq903mn8javc7qpi0ix4ink5x502"))))
@ -4895,6 +4897,8 @@ (define-public libxfont2
(method url-fetch)
(uri (string-append "mirror://xorg/individual/lib/libXfont2-"
version ".tar.bz2"))
(patches (search-patches "libxfont-CVE-2017-13720.patch"
"libxfont-CVE-2017-13722.patch"))
(sha256
(base32
"0znvwk36nhmyqpmhbm9mzisgixp1mp5qkfald8x1n5yxbm3vpyz9"))))))