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