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- /*
- * DUMA - Red-Zone memory allocator.
- * Copyright (C) 2002-2009 Hayati Ayguen <h_ayguen@web.de>, Procitec GmbH
- * License: GNU LGPL (GNU Lesser General Public License, see COPYING-GPL)
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * FILE CONTENTS:
- * internal implementation file
- * contains helper functions for DUMA
- */
- /* Function: reduceProtectedMemory
- *
- * delete reductionSizekB amount of memory, which has already
- * been freed but got protected
- * return != 0 when more memory reducable
- */
- static int reduceProtectedMemory(size_t reductionSizekB) {
- struct _DUMA_Slot *slot = _duma_g.allocList;
- size_t count = _duma_s.slotCount;
- size_t alreadyReducekB = 0;
- #ifndef WIN32
- /* Windows VirtualFree(,,MEM_RELEASE) can only free whole allocations. not
- * parts */
- size_t delSize, newSize;
- /* 1- try reducing memory to just keep page(s) with userAddress */
- for (; count > 0 && alreadyReducekB < reductionSizekB; --count, ++slot)
- if (DUMAST_ALL_PROTECTED == slot->state) {
- /* free memory above userAddr; keep userAddr protected */
- newSize = (char *)slot->userAddress - (char *)slot->internalAddress;
- newSize = (newSize + DUMA_PAGE_SIZE) & ~(DUMA_PAGE_SIZE - 1);
- delSize = slot->internalSize - newSize;
- Page_Delete((char *)slot->internalAddress + newSize, delSize);
- alreadyReducekB += (delSize + 1023) >> 10;
- slot->state = DUMAST_BEGIN_PROTECTED;
- /* but keep the slot and userAddr */
- slot->internalSize = newSize;
- if (alreadyReducekB >= reductionSizekB) {
- _duma_s.sumProtectedMem -= alreadyReducekB;
- _duma_s.sumAllocatedMem -= alreadyReducekB;
- return 1;
- }
- }
- #endif
- /* 2- deallocate all page(s) with userAddress, empty whole slot */
- slot = _duma_g.allocList;
- count = _duma_s.slotCount;
- for (; count > 0 && alreadyReducekB < reductionSizekB; --count, ++slot)
- if (DUMAST_BEGIN_PROTECTED == slot->state
- #if defined(WIN32)
- || DUMAST_ALL_PROTECTED == slot->state
- #endif
- ) {
- /* free all the memory */
- Page_Delete(slot->internalAddress, slot->internalSize);
- alreadyReducekB += (slot->internalSize + 1023) >> 10;
- /* free slot and userAddr */
- slot->internalAddress = slot->userAddress = 0;
- slot->internalSize = slot->userSize = 0;
- slot->state = DUMAST_EMPTY;
- slot->allocator = EFA_INT_ALLOC;
- #ifndef DUMA_NO_LEAKDETECTION
- slot->fileSource = DUMAFS_EMPTY;
- slot->filename = 0;
- slot->lineno = 0;
- #endif
- if (alreadyReducekB >= reductionSizekB) {
- _duma_s.sumProtectedMem -= alreadyReducekB;
- _duma_s.sumAllocatedMem -= alreadyReducekB;
- return 1;
- }
- }
- return 0;
- }
- /* Function: slotForUserAddress
- *
- * Find the slot structure for a user address.
- */
- static struct _DUMA_Slot *slotForUserAddress(void *address) {
- struct _DUMA_Slot *slot = _duma_g.allocList;
- size_t count = _duma_s.slotCount;
- for (; count > 0; --count, ++slot)
- if (slot->userAddress == address)
- return slot;
- return 0;
- }
- /* Function: nearestSlotForUserAddress
- *
- * Find the nearest slot structure for a user address.
- */
- static struct _DUMA_Slot *nearestSlotForUserAddress(void *userAddress) {
- struct _DUMA_Slot *slot = _duma_g.allocList;
- size_t count = _duma_s.slotCount;
- for (; count > 0; --count, ++slot)
- if ((char *)slot->internalAddress <= (char *)userAddress &&
- (char *)userAddress <=
- (char *)slot->internalAddress + slot->internalSize)
- return slot;
- return 0;
- }
- /* Function: _duma_init_slack
- *
- * Initialise the no mans land, for a given slot
- */
- static void _duma_init_slack(struct _DUMA_Slot *slot) {
- char *accBegAddr, *accEndAddr;
- char *tmpBegAddr, *tmpEndAddr;
- #ifdef DUMA_EXPLICIT_INIT
- slot->slackfill = _duma_s.SLACKFILL;
- #endif
- /* nothing to do for zero userSize */
- if (!slot->userSize)
- return;
- /* calculate accessible non-protectable address area */
- if ((char *)slot->protAddress < (char *)slot->userAddress) {
- /* DUMA_PROTECT_BELOW was 1 when allocating this piece of memory */
- accBegAddr = (char *)slot->userAddress;
- accEndAddr = (char *)slot->internalAddress + slot->internalSize;
- } else {
- /* DUMA_PROTECT_BELOW was 0 when allocating this piece of memory */
- accBegAddr = (char *)slot->internalAddress;
- accEndAddr = (char *)slot->protAddress;
- }
- tmpBegAddr = accBegAddr;
- tmpEndAddr = (char *)slot->userAddress;
- while (tmpBegAddr < tmpEndAddr)
- *tmpBegAddr++ = (char)_duma_s.SLACKFILL;
- tmpBegAddr = (char *)slot->userAddress + slot->userSize;
- tmpEndAddr = accEndAddr;
- while (tmpBegAddr < tmpEndAddr)
- *tmpBegAddr++ = (char)_duma_s.SLACKFILL;
- }
- /* Function: _duma_check_slack
- *
- * Checks the integrity of no mans land, for a given slot
- */
- static void _duma_check_slack(struct _DUMA_Slot *slot) {
- char *accBegAddr, *accEndAddr;
- char *tmpBegAddr, *tmpEndAddr;
- char slackfill;
- #ifdef DUMA_EXPLICIT_INIT
- slackfill = (char)slot->slackfill;
- #else
- slackfill = (char)_duma_s.SLACKFILL;
- #endif
- /* nothing to do for zero userSize */
- if (!slot->userSize)
- return;
- if (!slot->internalAddress)
- return;
- /* calculate accessible non-protectable address area */
- if ((char *)slot->protAddress < (char *)slot->userAddress) {
- /* DUMA_PROTECT_BELOW was 1 when allocating this piece of memory */
- accBegAddr = (char *)slot->userAddress;
- accEndAddr = (char *)slot->internalAddress + slot->internalSize;
- } else {
- /* DUMA_PROTECT_BELOW was 0 when allocating this piece of memory */
- accBegAddr = (char *)slot->internalAddress;
- accEndAddr = (char *)slot->protAddress;
- }
- tmpBegAddr = accBegAddr;
- tmpEndAddr = (char *)slot->userAddress;
- while (tmpBegAddr < tmpEndAddr) {
- if ((char)slackfill != *tmpBegAddr++) {
- #ifndef DUMA_NO_LEAKDETECTION
- DUMA_Abort("ptr=%a: detected overwrite of ptrs no mans land below "
- "userSpace, size=%d alloced from %s(%i)",
- (DUMA_ADDR)slot->userAddress, (DUMA_SIZE)slot->userSize,
- slot->filename, slot->lineno);
- #else
- DUMA_Abort(
- "ptr=%a: detected overwrite of ptrs no mans land below userSpace",
- (DUMA_ADDR)slot->userAddress);
- #endif
- }
- }
- tmpBegAddr = (char *)slot->userAddress + slot->userSize;
- tmpEndAddr = accEndAddr;
- while (tmpBegAddr < tmpEndAddr) {
- if ((char)slackfill != *tmpBegAddr++) {
- #ifndef DUMA_NO_LEAKDETECTION
- DUMA_Abort("detected overwrite of no mans land above userSpace: ptr=%a, "
- "size=%d\nalloced from %s(%i)",
- (DUMA_ADDR)slot->userAddress, (DUMA_SIZE)slot->userSize,
- slot->filename, slot->lineno);
- #else
- DUMA_Abort("detected overwrite of no mans land above userSpace: ptr=%a",
- (DUMA_ADDR)slot->userAddress);
- #endif
- }
- }
- }
- /* Function: _duma_check_all_slacks
- *
- * Checks the integrity of all no mans land
- */
- static void _duma_check_all_slacks(void) {
- struct _DUMA_Slot *slot = _duma_g.allocList;
- size_t count = _duma_s.slotCount;
- for (; count > 0; --count, ++slot) {
- /* CHECK INTEGRITY OF NO MANS LAND */
- if (DUMAST_IN_USE == slot->state && slot->userSize)
- _duma_check_slack(slot);
- }
- }
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