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From ed1e13a1f4e316bcf0dc0d4b2c16b1df3f075005 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Wed, 22 Jan 2014 22:37:15 -0800
Subject: [PATCH 21/40] dix: integer overflow in RegionSizeof() [CVE-2014-8092
3/4]
RegionSizeof contains several integer overflows if a large length
value is passed in. Once we fix it to return 0 on overflow, we
also have to fix the callers to handle this error condition
v2: Fixed limit calculation in RegionSizeof as pointed out by jcristau.
v3: backport to nx-libs 3.6.x (Mike DePaulo)
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Conflicts:
dix/region.c
include/regionstr.h
---
nx-X11/programs/Xserver/include/regionstr.h | 10 +++++---
nx-X11/programs/Xserver/mi/miregion.c | 39 ++++++++++++++++++++---------
2 files changed, 34 insertions(+), 15 deletions(-)
--- a/nx-X11/programs/Xserver/include/regionstr.h
+++ b/nx-X11/programs/Xserver/include/regionstr.h
@@ -53,6 +53,9 @@ SOFTWARE.
typedef struct _Region RegionRec, *RegionPtr;
+#include <stddef.h>
+#include <limits.h>
+
#include "miscstruct.h"
/* Return values from RectIn() */
@@ -93,7 +96,7 @@ extern RegDataRec miBrokenData;
#define REGION_BOX(reg,i) (®ION_BOXPTR(reg)[i])
#define REGION_TOP(reg) REGION_BOX(reg, (reg)->data->numRects)
#define REGION_END(reg) REGION_BOX(reg, (reg)->data->numRects - 1)
-#define REGION_SZOF(n) (sizeof(RegDataRec) + ((n) * sizeof(BoxRec)))
+#define REGION_SZOF(n) (n < ((INT_MAX - sizeof(RegDataRec)) / sizeof(BoxRec)) ? sizeof(RegDataRec) + ((n) * sizeof(BoxRec)) : 0)
/* Keith recommends weaning the region code of pScreen argument */
#define REG_pScreen screenInfo.screens[0]
@@ -257,9 +260,10 @@ extern RegDataRec miBrokenData;
} \
else \
{ \
+ size_t rgnSize; \
(_pReg)->extents = miEmptyBox; \
- if (((_size) > 1) && ((_pReg)->data = \
- (RegDataPtr)xalloc(REGION_SZOF(_size)))) \
+ if (((_size) > 1) && ((rgnSize = REGION_SZOF(_size)) > 0) && \
+ ((_pReg)->data = (RegDataPtr)xalloc(rgnSize))) \
{ \
(_pReg)->data->size = (_size); \
(_pReg)->data->numRects = 0; \
--- a/nx-X11/programs/Xserver/mi/miregion.c
+++ b/nx-X11/programs/Xserver/mi/miregion.c
@@ -172,7 +172,6 @@ Equipment Corporation.
((r1)->y1 <= (r2)->y1) && \
((r1)->y2 >= (r2)->y2) )
-#define xallocData(n) (RegDataPtr)xalloc(REGION_SZOF(n))
#define xfreeData(reg) if ((reg)->data && (reg)->data->size) xfree((reg)->data)
#define RECTALLOC_BAIL(pReg,n,bail) \
@@ -209,8 +208,9 @@ if (!(pReg)->data || (((pReg)->data->num
#define DOWNSIZE(reg,numRects) \
if (((numRects) < ((reg)->data->size >> 1)) && ((reg)->data->size > 50)) \
{ \
- RegDataPtr NewData; \
- NewData = (RegDataPtr)xrealloc((reg)->data, REGION_SZOF(numRects)); \
+ size_t NewSize = REGION_SZOF(numRects); \
+ RegDataPtr NewData = \
+ (NewSize > 0) ? (RegDataPtr)xrealloc((reg)->data, NewSize) : NULL; \
if (NewData) \
{ \
NewData->size = (numRects); \
@@ -337,7 +337,7 @@ miRegionCreate(rect, size)
int size;
{
register RegionPtr pReg;
-
+ size_t newSize;
pReg = (RegionPtr)xalloc(sizeof(RegionRec));
if (!pReg)
return &miBrokenRegion;
@@ -349,7 +349,9 @@ miRegionCreate(rect, size)
else
{
pReg->extents = miEmptyBox;
- if ((size > 1) && (pReg->data = xallocData(size)))
+ newSize = REGION_SZOF(size);
+ if ((size > 1) && (newSize > 0) &&
+ (pReg->data = xalloc(newSize)))
{
pReg->data->size = size;
pReg->data->numRects = 0;
@@ -371,6 +373,8 @@ miRegionInit(pReg, rect, size)
BoxPtr rect;
int size;
{
+ size_t newSize;
+
if (rect)
{
pReg->extents = *rect;
@@ -379,7 +383,9 @@ miRegionInit(pReg, rect, size)
else
{
pReg->extents = miEmptyBox;
- if ((size > 1) && (pReg->data = xallocData(size)))
+ newSize = REGION_SZOF(size);
+ if ((size > 1) && (newSize > 0) &&
+ (pReg->data = xalloc(newSize)))
{
pReg->data->size = size;
pReg->data->numRects = 0;
@@ -423,11 +429,13 @@ miRectAlloc(
int n)
{
RegDataPtr data;
+ size_t rgnSize;
if (!pRgn->data)
{
n++;
- pRgn->data = xallocData(n);
+ rgnSize = REGION_SZOF(n);
+ pRgn->data = (rgnSize > 0) ? xalloc(rgnSize) : NULL;
if (!pRgn->data)
return miRegionBreak (pRgn);
pRgn->data->numRects = 1;
@@ -435,7 +443,8 @@ miRectAlloc(
}
else if (!pRgn->data->size)
{
- pRgn->data = xallocData(n);
+ rgnSize = REGION_SZOF(n);
+ pRgn->data = (rgnSize > 0) ? xalloc(rgnSize) : NULL;
if (!pRgn->data)
return miRegionBreak (pRgn);
pRgn->data->numRects = 0;
@@ -449,7 +458,8 @@ miRectAlloc(
n = 250;
}
n += pRgn->data->numRects;
- data = (RegDataPtr)xrealloc(pRgn->data, REGION_SZOF(n));
+ rgnSize = REGION_SZOF(n);
+ data = (rgnSize > 0) ? xrealloc(pRgn->data, rgnSize) : NULL;
if (!data)
return miRegionBreak (pRgn);
pRgn->data = data;
@@ -476,8 +486,10 @@ miRegionCopy(dst, src)
}
if (!dst->data || (dst->data->size < src->data->numRects))
{
+ size_t newSize = REGION_SZOF(src->data->numRects);
xfreeData(dst);
- dst->data = xallocData(src->data->numRects);
+
+ dst->data = newSize > 0 ? xalloc(newSize) : NULL;
if (!dst->data)
return miRegionBreak (dst);
dst->data->size = src->data->numRects;
@@ -1667,6 +1679,7 @@ miRectsToRegion(nrects, prect, ctype)
register BoxPtr pBox;
register int i;
int x1, y1, x2, y2;
+ size_t newSize;
pRgn = miRegionCreate(NullBox, 0);
if (REGION_NAR (pRgn))
@@ -1691,7 +1704,8 @@ miRectsToRegion(nrects, prect, ctype)
}
return pRgn;
}
- pData = xallocData(nrects);
+ newSize = REGION_SZOF(nrects);
+ pData = newSize > 0 ? xalloc(newSize) : NULL;
if (!pData)
{
miRegionBreak (pRgn);
@@ -2206,8 +2220,9 @@ miRegionDataCopy(
}
if (!dst->data || (dst->data->size < src->data->numRects))
{
+ size_t newSize = REGION_SZOF(src->data->numRects);
xfreeData(dst);
- dst->data = xallocData(src->data->numRects);
+ dst->data = newSize > 0 ? xalloc(newSize) : NULL;
if (!dst->data)
return miRegionBreak (dst);
}
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