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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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