dlmalloc.c revision 9b5235d74e794d29fa912fe95ca3d5ec488dd371 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "dlmalloc.h"
18
19#include "private/bionic_name_mem.h"
20#include "private/libc_logging.h"
21
22// Send dlmalloc errors to the log.
23static void __bionic_heap_corruption_error(const char* function);
24static void __bionic_heap_usage_error(const char* function, void* address);
25#define PROCEED_ON_ERROR 0
26#define CORRUPTION_ERROR_ACTION(m) __bionic_heap_corruption_error(__FUNCTION__)
27#define USAGE_ERROR_ACTION(m,p) __bionic_heap_usage_error(__FUNCTION__, p)
28
29/* Bionic named anonymous memory declarations */
30static void* named_anonymous_mmap(size_t length);
31#define MMAP(s) named_anonymous_mmap(s)
32#define DIRECT_MMAP(s) named_anonymous_mmap(s)
33
34// Ugly inclusion of C file so that bionic specific #defines configure dlmalloc.
35#include "../upstream-dlmalloc/malloc.c"
36
37static void __bionic_heap_corruption_error(const char* function) {
38  __libc_fatal("heap corruption detected by %s", function);
39}
40
41static void __bionic_heap_usage_error(const char* function, void* address) {
42  __libc_fatal_no_abort("invalid address or address of corrupt block %p passed to %s",
43               address, function);
44  // So that debuggerd gives us a memory dump around the specific address.
45  // TODO: improve the debuggerd protocol so we can tell it to dump an address when we abort.
46  *((int**) 0xdeadbaad) = (int*) address;
47}
48
49static void* named_anonymous_mmap(size_t length) {
50  void* map = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
51  if (map == MAP_FAILED) {
52    return map;
53  }
54  __bionic_name_mem(map, length, "libc_malloc");
55  return map;
56}
57