forked from osmocom/wireshark
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(Using sed : sed -i '/^ \* \$Id\$/,+1 d') Fix manually some typo (in export_object_dicom.c and crc16-plain.c) Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8 Reviewed-on: https://code.wireshark.org/review/497 Reviewed-by: Anders Broman <a.broman58@gmail.com>
271 lines
7.4 KiB
C
271 lines
7.4 KiB
C
/* wmem_allocator_strict.c
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* Wireshark Memory Manager Strict Allocator
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* Copyright 2012, Evan Huus <eapache@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <string.h>
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#include <glib.h>
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#include "wmem_core.h"
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#include "wmem_allocator.h"
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#include "wmem_allocator_strict.h"
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/* In this allocator, we do everything we can to catch invalid memory accesses.
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* This includes using canaries (what Valgrind calls redzones) and
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* filling allocated and freed memory with garbage. Valgrind is still the
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* better tool on the platforms where it is available - use it instead if
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* possible.
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*/
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#define WMEM_CANARY_SIZE 4 /* in bytes */
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#define WMEM_CANARY_VALUE 0x9E
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#define WMEM_PREFILL 0xA1
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#define WMEM_POSTFILL 0x1A
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typedef struct _wmem_strict_allocator_block_t {
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/* Just the length of real_data, not counting the canaries */
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gsize data_len;
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guint8 *leading_canary;
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guint8 *real_data;
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guint8 *trailing_canary;
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} wmem_strict_allocator_block_t;
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typedef struct _wmem_strict_allocator_t {
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GHashTable *block_table;
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} wmem_strict_allocator_t;
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/*
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* some internal helper functions
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*/
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static void
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wmem_strict_block_check_canaries(wmem_strict_allocator_block_t *block)
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{
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guint i;
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for (i=0; i<WMEM_CANARY_SIZE; i++) {
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g_assert(block->leading_canary[i] == WMEM_CANARY_VALUE);
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g_assert(block->trailing_canary[i] == WMEM_CANARY_VALUE);
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}
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}
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/* wrapper for use with g_hash_table_foreach() */
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static void
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wmem_strict_ghash_check_canaries(gpointer key _U_, gpointer value,
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gpointer user_data _U_)
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{
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wmem_strict_block_check_canaries((wmem_strict_allocator_block_t *)value);
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}
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static void
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wmem_strict_block_free(wmem_strict_allocator_block_t *block)
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{
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memset(block->real_data, WMEM_POSTFILL, block->data_len);
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wmem_free(NULL, block->leading_canary);
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wmem_free(NULL, block);
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}
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/* wrapper for use with g_hash_table_new_full() */
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static void
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wmem_strict_ghash_block_free(gpointer data)
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{
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wmem_strict_block_free((wmem_strict_allocator_block_t *)data);
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}
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static wmem_strict_allocator_block_t *
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wmem_strict_block_new(const size_t size)
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{
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wmem_strict_allocator_block_t *block;
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guint i;
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block = wmem_new(NULL, wmem_strict_allocator_block_t);
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block->data_len = size;
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block->leading_canary = (guint8 *)wmem_alloc(NULL, block->data_len + (2 * WMEM_CANARY_SIZE));
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block->real_data = block->leading_canary + WMEM_CANARY_SIZE;
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block->trailing_canary = block->real_data + block->data_len;
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memset(block->real_data, WMEM_PREFILL, block->data_len);
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for (i=0; i<WMEM_CANARY_SIZE; i++) {
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block->leading_canary[i] = WMEM_CANARY_VALUE;
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block->trailing_canary[i] = WMEM_CANARY_VALUE;
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}
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return block;
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}
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/*
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* public API functions
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*/
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static void *
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wmem_strict_alloc(void *private_data, const size_t size)
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{
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wmem_strict_allocator_t *allocator;
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wmem_strict_allocator_block_t *block;
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allocator = (wmem_strict_allocator_t*) private_data;
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block = wmem_strict_block_new(size);
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/* we store a pointer to our header, keyed by a pointer to the actual
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* block we return to the user */
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g_hash_table_insert(allocator->block_table, block->real_data, block);
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return block->real_data;
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}
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static void
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wmem_strict_free(void *private_data, void *ptr)
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{
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wmem_strict_allocator_t *allocator;
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wmem_strict_allocator_block_t *block;
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allocator = (wmem_strict_allocator_t*) private_data;
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block = (wmem_strict_allocator_block_t *)g_hash_table_lookup(allocator->block_table, ptr);
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g_assert(block);
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wmem_strict_block_check_canaries(block);
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g_hash_table_remove(allocator->block_table, ptr);
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}
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static void *
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wmem_strict_realloc(void *private_data, void *ptr, const size_t size)
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{
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gsize copy_len;
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wmem_strict_allocator_t *allocator;
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wmem_strict_allocator_block_t *block, *newblock;
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allocator = (wmem_strict_allocator_t*) private_data;
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/* retrieve and check the old block */
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block = (wmem_strict_allocator_block_t *)g_hash_table_lookup(allocator->block_table, ptr);
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g_assert(block);
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wmem_strict_block_check_canaries(block);
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/* create a new block */
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newblock = wmem_strict_block_new(size);
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/* copy from the old block to the new */
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if (block->data_len > newblock->data_len) {
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copy_len = newblock->data_len;
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}
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else {
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copy_len = block->data_len;
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}
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memcpy(newblock->real_data, block->real_data, copy_len);
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/* update the hash table */
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g_hash_table_remove(allocator->block_table, ptr);
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g_hash_table_insert(allocator->block_table, newblock->real_data, newblock);
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return newblock->real_data;
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}
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void
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wmem_strict_check_canaries(wmem_allocator_t *allocator)
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{
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wmem_strict_allocator_t *private_allocator;
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if (allocator->type != WMEM_ALLOCATOR_STRICT) {
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return;
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}
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private_allocator = (wmem_strict_allocator_t*) allocator->private_data;
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g_hash_table_foreach(private_allocator->block_table,
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&wmem_strict_ghash_check_canaries, NULL);
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}
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static void
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wmem_strict_free_all(void *private_data)
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{
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wmem_strict_allocator_t *allocator;
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allocator = (wmem_strict_allocator_t*) private_data;
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g_hash_table_foreach(allocator->block_table,
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&wmem_strict_ghash_check_canaries, NULL);
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g_hash_table_remove_all(allocator->block_table);
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}
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static void
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wmem_strict_gc(void *private_data _U_)
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{
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/* We don't really have anything to garbage-collect, but it might be worth
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* checking our canaries at this point? */
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}
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static void
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wmem_strict_allocator_cleanup(void *private_data)
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{
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wmem_strict_allocator_t *allocator;
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allocator = (wmem_strict_allocator_t*) private_data;
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g_hash_table_destroy(allocator->block_table);
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wmem_free(NULL, allocator);
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}
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void
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wmem_strict_allocator_init(wmem_allocator_t *allocator)
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{
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wmem_strict_allocator_t *strict_allocator;
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strict_allocator = wmem_new(NULL, wmem_strict_allocator_t);
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allocator->alloc = &wmem_strict_alloc;
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allocator->realloc = &wmem_strict_realloc;
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allocator->free = &wmem_strict_free;
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allocator->free_all = &wmem_strict_free_all;
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allocator->gc = &wmem_strict_gc;
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allocator->cleanup = &wmem_strict_allocator_cleanup;
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allocator->private_data = (void*) strict_allocator;
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strict_allocator->block_table = g_hash_table_new_full(
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&g_direct_hash, &g_direct_equal,
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NULL, &wmem_strict_ghash_block_free);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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