118 lines
3.4 KiB
C
118 lines
3.4 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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/* Bionic error handling declarations */
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#define PROCEED_ON_ERROR 0
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static void __bionic_heap_error(const char* msg, const char* function, void* p);
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#define CORRUPTION_ERROR_ACTION(m) \
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__bionic_heap_error("HEAP MEMORY CORRUPTION", __FUNCTION__, NULL)
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#define USAGE_ERROR_ACTION(m,p) \
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__bionic_heap_error("ARGUMENT IS INVALID HEAP ADDRESS", __FUNCTION__, p)
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/* Bionic named anonymous memory declarations */
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static void* named_anonymous_mmap(size_t length);
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#define MMAP(s) named_anonymous_mmap(s)
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/*
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* Ugly inclusion of C file so that bionic specific #defines configure
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* dlmalloc.
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*/
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#include "../upstream-dlmalloc/malloc.c"
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/* Bionic error handling definitions */
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/* Convert a pointer into hex string */
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static void __bionic_itox(char* hex, void* ptr)
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{
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intptr_t val = (intptr_t) ptr;
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/* Terminate with NULL */
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hex[8] = 0;
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int i;
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for (i = 7; i >= 0; i--) {
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int digit = val & 15;
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hex[i] = (digit <= 9) ? digit + '0' : digit - 10 + 'a';
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val >>= 4;
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}
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}
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#include <private/logd.h>
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static void __bionic_heap_error(const char* msg, const char* function, void* p)
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{
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/* We format the buffer explicitely, i.e. without using snprintf()
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* which may use malloc() internally. Not something we can trust
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* if we just detected a corrupted heap.
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*/
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char buffer[256];
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strlcpy(buffer, "@@@ ABORTING: LIBC: ", sizeof(buffer));
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strlcat(buffer, msg, sizeof(buffer));
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if (function != NULL) {
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strlcat(buffer, " IN ", sizeof(buffer));
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strlcat(buffer, function, sizeof(buffer));
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}
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if (p != NULL) {
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char hexbuffer[9];
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__bionic_itox(hexbuffer, p);
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strlcat(buffer, " addr=0x", sizeof(buffer));
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strlcat(buffer, hexbuffer, sizeof(buffer));
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}
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__libc_android_log_write(ANDROID_LOG_FATAL, "libc", buffer);
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/* So that we can get a memory dump around p */
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*((int **) 0xdeadbaad) = (int *) p;
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}
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/* Bionic named anonymous memory definitions */
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#include <linux/ashmem.h>
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static int __ashmem_create_region(const char* name, size_t size)
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{
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int fd, ret;
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fd = open("/dev/ashmem", O_RDWR);
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if (fd < 0)
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return fd;
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if (name != NULL) {
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char buf[ASHMEM_NAME_LEN];
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strlcpy(buf, name, sizeof(buf));
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ret = ioctl(fd, ASHMEM_SET_NAME, buf);
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if (ret < 0) { /* error */
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close(fd);
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return ret;
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}
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}
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ret = ioctl(fd, ASHMEM_SET_SIZE, size);
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if (ret < 0) { /* error */
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close(fd);
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return ret;
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}
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return fd;
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}
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static void* named_anonymous_mmap(size_t length)
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{
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void* ret;
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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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ret = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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close (fd);
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return ret;
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}
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