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 <malloc/malloc.h>
35 #import <sys/mman.h>
36
37 static void* (*savedMalloc)(malloc_zone_t*, size_t);
38 static void* (*savedRealloc)(malloc_zone_t*, void*, size_t);
39
checkedMalloc(malloc_zone_t * zone,size_t size)40 static void* checkedMalloc(malloc_zone_t* zone, size_t size)
41 {
42 if (size >= 0x10000000)
43 return 0;
44 return savedMalloc(zone, size);
45 }
46
checkedRealloc(malloc_zone_t * zone,void * ptr,size_t size)47 static void* checkedRealloc(malloc_zone_t* zone, void* ptr, size_t size)
48 {
49 if (size >= 0x10000000)
50 return 0;
51 return savedRealloc(zone, ptr, size);
52 }
53
makeLargeMallocFailSilently()54 void makeLargeMallocFailSilently()
55 {
56 malloc_zone_t* zone = malloc_default_zone();
57
58 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
59 vm_address_t pageStart = reinterpret_cast<vm_address_t>(zone) & static_cast<vm_size_t>(~(getpagesize() - 1));
60 vm_size_t len = reinterpret_cast<vm_address_t>(zone) - pageStart + sizeof(malloc_zone_t);
61 mprotect(reinterpret_cast<void*>(pageStart), len, PROT_READ | PROT_WRITE);
62 #endif
63
64 savedMalloc = zone->malloc;
65 savedRealloc = zone->realloc;
66 zone->malloc = checkedMalloc;
67 zone->realloc = checkedRealloc;
68
69 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
70 mprotect(reinterpret_cast<void*>(pageStart), len, PROT_READ);
71 #endif
72 }
73