| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "dlmalloc.h" |
| |
| #include <fcntl.h> |
| #include <stdlib.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <linux/ashmem.h> |
| |
| #include <private/debug_format.h> |
| #include <private/logd.h> |
| |
| // Send dlmalloc errors to the log. |
| static void __bionic_heap_corruption_error(const char* function); |
| static void __bionic_heap_usage_error(const char* function, void* address); |
| #define PROCEED_ON_ERROR 0 |
| #define CORRUPTION_ERROR_ACTION(m) __bionic_heap_corruption_error(__FUNCTION__) |
| #define USAGE_ERROR_ACTION(m,p) __bionic_heap_usage_error(__FUNCTION__, p) |
| |
| // We use ashmem to name the anonymous private regions created by dlmalloc. |
| static void* __bionic_named_anonymous_mmap(size_t length); |
| #define MMAP(s) __bionic_named_anonymous_mmap(s) |
| |
| // Ugly inclusion of C file so that bionic specific #defines configure dlmalloc. |
| #include "../upstream-dlmalloc/malloc.c" |
| |
| static void __bionic_heap_corruption_error(const char* function) { |
| __libc_format_log(ANDROID_LOG_FATAL, "libc", "@@@ ABORTING: heap corruption detected by %s", |
| function); |
| abort(); |
| } |
| |
| static void __bionic_heap_usage_error(const char* function, void* address) { |
| __libc_format_log(ANDROID_LOG_FATAL, "libc", "@@@ ABORTING: invalid address %p passed to %s", |
| address, function); |
| // So that we can get a memory dump around the specific address. |
| *((int**) 0xdeadbaad) = (int*) address; |
| } |
| |
| static int __ashmem_create_region(const char* name, size_t size) { |
| int fd = open("/dev/ashmem", O_RDWR); |
| if (fd == -1) { |
| return fd; |
| } |
| int rc = ioctl(fd, ASHMEM_SET_NAME, name); |
| if (rc < 0) { |
| close(fd); |
| return rc; |
| } |
| rc = ioctl(fd, ASHMEM_SET_SIZE, size); |
| if (rc < 0) { |
| close(fd); |
| return rc; |
| } |
| return fd; |
| } |
| |
| static void* __bionic_named_anonymous_mmap(size_t length) { |
| int fd = __ashmem_create_region("libc malloc", length); |
| if (fd < 0) { |
| return MAP_FAILED; |
| } |
| void* result = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| close (fd); |
| return result; |
| } |