diff -r 000000000000 -r 4f2f89ce4247 WebKitTools/DumpRenderTree/mac/CheckedMalloc.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/DumpRenderTree/mac/CheckedMalloc.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
+ *           (C) 2007 Graham Dennis (graham.dennis@gmail.com)
+ *           (C) 2007 Eric Seidel <eric@webkit.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h" 
+#import "CheckedMalloc.h"
+
+#import <malloc/malloc.h>
+#import <sys/mman.h>
+
+static void* (*savedMalloc)(malloc_zone_t*, size_t);
+static void* (*savedRealloc)(malloc_zone_t*, void*, size_t);
+
+static void* checkedMalloc(malloc_zone_t* zone, size_t size)
+{
+    if (size >= 0x10000000)
+        return 0;
+    return savedMalloc(zone, size);
+}
+
+static void* checkedRealloc(malloc_zone_t* zone, void* ptr, size_t size)
+{
+    if (size >= 0x10000000)
+        return 0;
+    return savedRealloc(zone, ptr, size);
+}
+
+void makeLargeMallocFailSilently()
+{
+    malloc_zone_t* zone = malloc_default_zone();
+
+#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
+    vm_address_t pageStart = reinterpret_cast<vm_address_t>(zone) & static_cast<vm_size_t>(~(getpagesize() - 1));
+    vm_size_t len = reinterpret_cast<vm_address_t>(zone) - pageStart + sizeof(malloc_zone_t);
+    mprotect(reinterpret_cast<void*>(pageStart), len, PROT_READ | PROT_WRITE);
+#endif
+
+    savedMalloc = zone->malloc;
+    savedRealloc = zone->realloc;
+    zone->malloc = checkedMalloc;
+    zone->realloc = checkedRealloc;
+
+#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
+    mprotect(reinterpret_cast<void*>(pageStart), len, PROT_READ);
+#endif
+}