1 /*
2 * Copyright (C) 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
3 * (C) 2007 Graham Dennis (graham.dennis@gmail.com)
4 * (C) 2007 Eric Seidel <eric@webkit.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
16 * its contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #import "config.h"
32 #import "CheckedMalloc.h"
33
34 #import <mach/mach_init.h>
35 #import <mach/mach_vm.h>
36 #import <mach/vm_region.h>
37 #import <malloc/malloc.h>
38
39 static void* (*savedMalloc)(malloc_zone_t*, size_t);
40 static void* (*savedRealloc)(malloc_zone_t*, void*, size_t);
41
checkedMalloc(malloc_zone_t * zone,size_t size)42 static void* checkedMalloc(malloc_zone_t* zone, size_t size)
43 {
44 if (size >= 0x10000000)
45 return 0;
46 return savedMalloc(zone, size);
47 }
48
checkedRealloc(malloc_zone_t * zone,void * ptr,size_t size)49 static void* checkedRealloc(malloc_zone_t* zone, void* ptr, size_t size)
50 {
51 if (size >= 0x10000000)
52 return 0;
53 return savedRealloc(zone, ptr, size);
54 }
55
56 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
protectionOfRegion(mach_vm_address_t address)57 static vm_prot_t protectionOfRegion(mach_vm_address_t address)
58 {
59 mach_vm_size_t regionSize = 0;
60 vm_region_basic_info_64 regionInfo;
61 mach_msg_type_number_t regionInfoCount = VM_REGION_BASIC_INFO_COUNT_64;
62 mach_port_t objectName;
63 if (mach_vm_region(mach_task_self(), &address, ®ionSize, VM_REGION_BASIC_INFO_64, (vm_region_info_t)®ionInfo, ®ionInfoCount, &objectName))
64 CRASH();
65 return regionInfo.protection;
66 }
67 #endif
68
makeLargeMallocFailSilently()69 void makeLargeMallocFailSilently()
70 {
71 malloc_zone_t* zone = malloc_default_zone();
72
73 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
74 mach_vm_address_t pageStart = reinterpret_cast<vm_address_t>(zone) & static_cast<vm_size_t>(~(getpagesize() - 1));
75 vm_prot_t initialProtection = protectionOfRegion(pageStart);
76
77 vm_size_t len = reinterpret_cast<vm_address_t>(zone) - pageStart + sizeof(malloc_zone_t);
78 if (mach_vm_protect(mach_task_self(), pageStart, len, 0, initialProtection | VM_PROT_WRITE))
79 CRASH();
80 #endif
81
82 savedMalloc = zone->malloc;
83 savedRealloc = zone->realloc;
84 zone->malloc = checkedMalloc;
85 zone->realloc = checkedRealloc;
86
87 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
88 if (mach_vm_protect(mach_task_self(), pageStart, len, 0, initialProtection))
89 CRASH();
90 #endif
91 }
92