dlmalloc.c revision b46696858b9018ff8a1069d429366e05d4814c52 
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/libc_logging.h"
20
21// Send dlmalloc errors to the log.
22static void __bionic_heap_corruption_error(const char* function);
23static void __bionic_heap_usage_error(const char* function, void* address);
24#define PROCEED_ON_ERROR 0
25#define CORRUPTION_ERROR_ACTION(m) __bionic_heap_corruption_error(__FUNCTION__)
26#define USAGE_ERROR_ACTION(m,p) __bionic_heap_usage_error(__FUNCTION__, p)
27
28// Bionic named anonymous memory declarations.
29static void* named_anonymous_mmap(size_t length);
30#define MMAP(s) named_anonymous_mmap(s)
31#define DIRECT_MMAP(s) named_anonymous_mmap(s)
32
33// Local definitions of custom prctl arguments to set a vma name in Android kernels.
34#include <sys/prctl.h>
35#define PR_SET_VMA           0x53564d41
36#define PR_SET_VMA_ANON_NAME 0
37
38// Ugly inclusion of C file so that bionic specific #defines configure dlmalloc.
39#include "../upstream-dlmalloc/malloc.c"
40
41static void __bionic_heap_corruption_error(const char* function) {
42  __libc_fatal("heap corruption detected by %s", function);
43}
44
45static void __bionic_heap_usage_error(const char* function, void* address) {
46  __libc_fatal_no_abort("invalid address or address of corrupt block %p passed to %s",
47               address, function);
48  // So that debuggerd gives us a memory dump around the specific address.
49  // TODO: improve the debuggerd protocol so we can tell it to dump an address when we abort.
50  *((int**) 0xdeadbaad) = (int*) address;
51}
52
53static void* named_anonymous_mmap(size_t length) {
54  void* map = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
55  if (map == MAP_FAILED) {
56    return map;
57  }
58  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, map, length, "libc_malloc");
59  return map;
60}
61