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/*
* 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>
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_TIGER) && !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, ®ionSize, VM_REGION_BASIC_INFO_64, (vm_region_info_t)®ionInfo, ®ionInfoCount, &objectName))
CRASH();
return regionInfo.protection;
}
#endif
void makeLargeMallocFailSilently()
{
malloc_zone_t* zone = malloc_default_zone();
#if !defined(BUILDING_ON_TIGER) && !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_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
if (mach_vm_protect(mach_task_self(), pageStart, len, 0, initialProtection))
CRASH();
#endif
}
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