[gegl] fix buffer overflow in and add plausibility checks to ppm-load op
Nils Philippsen
nphilipp at fedoraproject.org
Mon Jul 1 12:57:46 UTC 2013
commit e6f2bbaeb4e028fdaf71cbd45c943065e45b3302
Author: Nils Philippsen <nils at redhat.com>
Date: Mon Jul 1 14:47:25 2013 +0200
fix buffer overflow in and add plausibility checks to ppm-load op
(CVE-2012-4433)
gegl-0.2.0-CVE-2012-4433.patch | 159 ++++++++++++++++++++++++++++++++++++++++
gegl.spec | 4 +
2 files changed, 163 insertions(+), 0 deletions(-)
---
diff --git a/gegl-0.2.0-CVE-2012-4433.patch b/gegl-0.2.0-CVE-2012-4433.patch
new file mode 100644
index 0000000..965c6fc
--- /dev/null
+++ b/gegl-0.2.0-CVE-2012-4433.patch
@@ -0,0 +1,159 @@
+From ffa77a246652c7e706d690682fe659f50fbe5656 Mon Sep 17 00:00:00 2001
+From: Nils Philippsen <nils at redhat.com>
+Date: Mon, 1 Jul 2013 12:03:51 +0200
+Subject: [PATCH] patch: CVE-2012-4433
+
+Squashed commit of the following:
+
+commit 2a9071e2dc4cfe1aaa7a726805985281936f9874
+Author: Nils Philippsen <nils at redhat.com>
+Date: Tue Oct 16 16:57:37 2012 +0200
+
+ ppm-load: bring comment in line with reality
+
+ (cherry picked from commit 6975a9cfeaf0698b42ac81b1c2f00d13c8755453)
+
+commit 8bb88ebf78e54837322d3be74688f98800e9f33a
+Author: Nils Philippsen <nils at redhat.com>
+Date: Tue Oct 16 16:56:40 2012 +0200
+
+ ppm-load: CVE-2012-4433: add plausibility checks for header fields
+
+ Refuse values that are non-decimal, negative or overflow the target
+ type.
+
+ (cherry picked from commit 4757cdf73d3675478d645a3ec8250ba02168a230)
+
+commit 2b099886969bf055a8635d06a4d89f20fed1ee42
+Author: Nils Philippsen <nils at redhat.com>
+Date: Tue Oct 16 16:58:27 2012 +0200
+
+ ppm-load: CVE-2012-4433: don't overflow memory allocation
+
+ Carefully selected width/height values could cause the size of a later
+ allocation to overflow, resulting in a buffer much too small to store
+ the data which would then written beyond its end.
+
+ (cherry picked from commit 1e92e5235ded0415d555aa86066b8e4041ee5a53)
+---
+ operations/external/ppm-load.c | 64 +++++++++++++++++++++++++++++++++++-------
+ 1 file changed, 54 insertions(+), 10 deletions(-)
+
+diff --git a/operations/external/ppm-load.c b/operations/external/ppm-load.c
+index efe6d56..e22521c 100644
+--- a/operations/external/ppm-load.c
++++ b/operations/external/ppm-load.c
+@@ -36,6 +36,7 @@ gegl_chant_file_path (path, _("File"), "", _("Path of file to load."))
+ #include "gegl-chant.h"
+ #include <stdio.h>
+ #include <stdlib.h>
++#include <errno.h>
+
+ typedef enum {
+ PIXMAP_ASCII = 51,
+@@ -44,8 +45,8 @@ typedef enum {
+
+ typedef struct {
+ map_type type;
+- gint width;
+- gint height;
++ glong width;
++ glong height;
+ gsize numsamples; /* width * height * channels */
+ gsize bpc; /* bytes per channel */
+ guchar *data;
+@@ -61,7 +62,7 @@ ppm_load_read_header(FILE *fp,
+ gchar header[MAX_CHARS_IN_ROW];
+ gint maxval;
+
+- /* Check the PPM file Type P2 or P5 */
++ /* Check the PPM file Type P3 or P6 */
+ fgets (header,MAX_CHARS_IN_ROW,fp);
+
+ if (header[0] != ASCII_P ||
+@@ -82,12 +83,33 @@ ppm_load_read_header(FILE *fp,
+ }
+
+ /* Get Width and Height */
+- img->width = strtol (header,&ptr,0);
+- img->height = atoi (ptr);
+- img->numsamples = img->width * img->height * CHANNEL_COUNT;
++ errno = 0;
++ img->width = strtol (header,&ptr,10);
++ if (errno)
++ {
++ g_warning ("Error reading width: %s", strerror(errno));
++ return FALSE;
++ }
++ else if (img->width < 0)
++ {
++ g_warning ("Error: width is negative");
++ return FALSE;
++ }
++
++ img->height = strtol (ptr,&ptr,10);
++ if (errno)
++ {
++ g_warning ("Error reading height: %s", strerror(errno));
++ return FALSE;
++ }
++ else if (img->width < 0)
++ {
++ g_warning ("Error: height is negative");
++ return FALSE;
++ }
+
+ fgets (header,MAX_CHARS_IN_ROW,fp);
+- maxval = strtol (header,&ptr,0);
++ maxval = strtol (header,&ptr,10);
+
+ if ((maxval != 255) && (maxval != 65535))
+ {
+@@ -109,6 +131,16 @@ ppm_load_read_header(FILE *fp,
+ g_warning ("%s: Programmer stupidity error", G_STRLOC);
+ }
+
++ /* Later on, img->numsamples is multiplied with img->bpc to allocate
++ * memory. Ensure it doesn't overflow. */
++ if (!img->width || !img->height ||
++ G_MAXSIZE / img->width / img->height / CHANNEL_COUNT < img->bpc)
++ {
++ g_warning ("Illegal width/height: %ld/%ld", img->width, img->height);
++ return FALSE;
++ }
++ img->numsamples = img->width * img->height * CHANNEL_COUNT;
++
+ return TRUE;
+ }
+
+@@ -229,12 +261,24 @@ process (GeglOperation *operation,
+ if (!ppm_load_read_header (fp, &img))
+ goto out;
+
+- rect.height = img.height;
+- rect.width = img.width;
+-
+ /* Allocating Array Size */
++
++ /* Should use g_try_malloc(), but this causes crashes elsewhere because the
++ * error signalled by returning FALSE isn't properly acted upon. Therefore
++ * g_malloc() is used here which aborts if the requested memory size can't be
++ * allocated causing a controlled crash. */
+ img.data = (guchar*) g_malloc (img.numsamples * img.bpc);
+
++ /* No-op without g_try_malloc(), see above. */
++ if (! img.data)
++ {
++ g_warning ("Couldn't allocate %" G_GSIZE_FORMAT " bytes, giving up.", ((gsize)img.numsamples * img.bpc));
++ goto out;
++ }
++
++ rect.height = img.height;
++ rect.width = img.width;
++
+ switch (img.bpc)
+ {
+ case 1:
+--
+1.8.3.1
+
diff --git a/gegl.spec b/gegl.spec
index e690216..ec5ce37 100644
--- a/gegl.spec
+++ b/gegl.spec
@@ -31,6 +31,7 @@ Group: System Environment/Libraries
URL: http://www.gegl.org/
Source0: ftp://ftp.gimp.org/pub/gegl/%{apiver}/%{name}-%{version}.tar.bz2
Patch0: gegl-0.2.0-lua-5.2.patch
+Patch1: gegl-0.2.0-CVE-2012-4433.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
BuildRequires: asciidoc
BuildRequires: babl-devel >= 0.1.10
@@ -95,6 +96,7 @@ developing with %{name}.
%prep
%setup -q
%patch0 -p1 -b .lua-5.2
+%patch1 -p1 -b .CVE-2012-4433
%build
# use hardening compiler/linker flags because gegl is likely to deal with
@@ -226,6 +228,8 @@ rm -rf %{buildroot}
%changelog
* Mon Jul 01 2013 Nils Philippsen <nils at redhat.com>
- replace lua-5.2 patch by upstream commit
+- fix buffer overflow in and add plausibility checks to ppm-load op
+ (CVE-2012-4433)
* Wed May 15 2013 Tom Callaway <spot at fedoraproject.org> - 0.2.0-10
- rebuild for lua 5.2
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