1 files changed, 92 insertions, 0 deletions
diff --git a/Tools/DumpRenderTree/mac/CheckedMalloc.cpp b/Tools/DumpRenderTree/mac/CheckedMalloc.cpp
new file mode 100644
index 000000000..8bd53e546
--- /dev/null
+++ b/Tools/DumpRenderTree/mac/CheckedMalloc.cpp
@@ -0,0 +1,92 @@
+/*
+ * 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 <mach/mach_init.h>
+#import <mach/mach_vm.h>
+#import <mach/vm_region.h>
+#import <malloc/malloc.h>
+#import <unistd.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);
+}
+
+#if !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
+static vm_prot_t protectionOfRegion(mach_vm_address_t address)
+{
+    mach_vm_size_t regionSize = 0;
+    vm_region_basic_info_64 regionInfo;
+    mach_msg_type_number_t regionInfoCount = VM_REGION_BASIC_INFO_COUNT_64;
+    mach_port_t objectName;
+    if (mach_vm_region(mach_task_self(), &address, &regionSize, VM_REGION_BASIC_INFO_64, (vm_region_info_t)&regionInfo, &regionInfoCount, &objectName))
+        CRASH();
+    return regionInfo.protection;
+}
+#endif
+
+void makeLargeMallocFailSilently()
+{
+    malloc_zone_t* zone = malloc_default_zone();
+
+#if !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
+    mach_vm_address_t pageStart = reinterpret_cast<vm_address_t>(zone) & static_cast<vm_size_t>(~(getpagesize() - 1));
+    vm_prot_t initialProtection = protectionOfRegion(pageStart);
+
+    vm_size_t len = reinterpret_cast<vm_address_t>(zone) - pageStart + sizeof(malloc_zone_t);
+    if (mach_vm_protect(mach_task_self(), pageStart, len, 0, initialProtection | VM_PROT_WRITE))
+        CRASH();
+#endif
+
+    savedMalloc = zone->malloc;
+    savedRealloc = zone->realloc;
+    zone->malloc = checkedMalloc;
+    zone->realloc = checkedRealloc;
+
+#if !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
+    if (mach_vm_protect(mach_task_self(), pageStart, len, 0, initialProtection))
+        CRASH();
+#endif
+}