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Security patch for CVE-2018-10194 added

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Resolves: #1569821
This commit is contained in:
David Kaspar [Dee'Kej] 2018-04-23 14:10:22 +02:00
parent ecf6f332cf
commit aebe8d11d4
2 changed files with 48 additions and 1 deletions
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43
ghostscript-9.23-000-CVE-2018-10194.patch Normal file
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@ -0,0 +1,43 @@
From 39b1e54b2968620723bf32e96764c88797714879 Mon Sep 17 00:00:00 2001
From: Ken Sharp <ken.sharp@artifex.com>
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.
--
2.14.3

6
ghostscript.spec
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@ -43,7 +43,7 @@
Name: ghostscript
Summary: Interpreter for PostScript language & PDF
Version: 9.23
Release: 1%{?dist}
Release: 2%{?dist}
License: AGPLv3+
@ -93,6 +93,7 @@ BuildRequires: libXt-devel
# Upstream patches -- official upstream patches released by upstream since the
# ---------------- last rebase that are necessary for any reason:
#Patch000: example000.patch
Patch000: ghostscript-9.23-000-CVE-2018-10194.patch
# Downstream patches -- these should be always included when doing rebase:
@ -461,6 +462,9 @@ done
# =============================================================================
%changelog
* Mon Apr 23 2018 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 9.23-2
- Fix for CVE-2018-10194 added (bug #1569821)
* Wed Mar 21 2018 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 9.23-1
- Rebase to latest upstream version