/* $Id: alloc-ef.cpp 1 1970-01-01 00:00:00Z vboxsync $ */ /** @file * InnoTek Portable Runtime - Memory Allocation, electric fence. */ /* * Copyright (C) 2006 InnoTek Systemberatung GmbH * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License as published by the Free Software Foundation, * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE * distribution. VirtualBox OSE is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY of any kind. * * If you received this file as part of a commercial VirtualBox * distribution, then only the terms of your commercial VirtualBox * license agreement apply instead of the previous paragraph. */ /******************************************************************************* * Header Files * *******************************************************************************/ #include "alloc-ef.h" #include #include #include #include #include #include #include #include #include #include #include #include /******************************************************************************* * Global Variables * *******************************************************************************/ #ifdef RTALLOC_EFENCE_TRACE /** Spinlock protecting the allthe blocks globals. */ static volatile uint32_t g_BlocksLock; /** Tree tracking the allocations. */ static AVLPVTREE g_BlocksTree; #ifdef RTALLOC_EFENCE_FREE_DELAYED /** Tail of the delayed blocks. */ static volatile PRTMEMBLOCK g_pBlocksDelayHead; /** Tail of the delayed blocks. */ static volatile PRTMEMBLOCK g_pBlocksDelayTail; /** Number of bytes in the delay list (includes fences). */ static volatile size_t g_cbBlocksDelay; #endif #endif /** Array of pointers free watches for. */ void *gapvRTMemFreeWatch[4] = {0}; /** Enable logging of all freed memory. */ bool gfRTMemFreeLog = false; /******************************************************************************* * Internal Functions * *******************************************************************************/ /** * Complains about something. */ static void rtmemComplain(const char *pszOp, const char *pszFormat, ...) { va_list args; fprintf(stderr, "RTMem error: %s: ", pszOp); va_start(args, pszFormat); vfprintf(stderr, pszFormat, args); va_end(args); AssertReleaseBreakpoint(); } /** * Log an event. */ static inline void rtmemLog(const char *pszOp, const char *pszFormat, ...) { #if 0 va_list args; fprintf(stderr, "RTMem info: %s: ", pszOp); va_start(args, pszFormat); vfprintf(stderr, pszFormat, args); va_end(args); #endif } #ifdef RTALLOC_EFENCE_TRACE /** * Aquires the lock. */ static inline void rtmemBlockLock(void) { unsigned c = 0; while (!ASMAtomicCmpXchgU32(&g_BlocksLock, 1, 0)) RTThreadSleep(((++c) >> 2) & 31); } /** * Releases the lock. */ static inline void rtmemBlockUnlock(void) { Assert(g_BlocksLock == 1); ASMAtomicXchgU32(&g_BlocksLock, 0); } /** * Creates a block. */ static inline PRTMEMBLOCK rtmemBlockCreate(RTMEMTYPE enmType, size_t cb, void *pvCaller, unsigned iLine, const char *pszFile, const char *pszFunction) { PRTMEMBLOCK pBlock = (PRTMEMBLOCK)malloc(sizeof(*pBlock)); if (pBlock) { pBlock->enmType = enmType; pBlock->cb = cb; pBlock->pvCaller = pvCaller; pBlock->iLine = iLine; pBlock->pszFile = pszFile; pBlock->pszFunction = pszFunction; } return pBlock; } /** * Frees a block. */ static inline void rtmemBlockFree(PRTMEMBLOCK pBlock) { free(pBlock); } /** * Insert a block from the tree. */ static inline void rtmemBlockInsert(PRTMEMBLOCK pBlock, void *pv) { pBlock->Core.Key = pv; rtmemBlockLock(); bool fRc = RTAvlPVInsert(&g_BlocksTree, &pBlock->Core); rtmemBlockUnlock(); AssertRelease(fRc); } /** * Remove a block from the tree and returns it to the caller. */ static inline PRTMEMBLOCK rtmemBlockRemove(void *pv) { rtmemBlockLock(); PRTMEMBLOCK pBlock = (PRTMEMBLOCK)RTAvlPVRemove(&g_BlocksTree, pv); rtmemBlockUnlock(); return pBlock; } /** * Gets a block. */ static inline PRTMEMBLOCK rtmemBlockGet(void *pv) { rtmemBlockLock(); PRTMEMBLOCK pBlock = (PRTMEMBLOCK)RTAvlPVGet(&g_BlocksTree, pv); rtmemBlockUnlock(); return pBlock; } /** * Dumps one allocation. */ static DECLCALLBACK(int) RTMemDumpOne(PAVLPVNODECORE pNode, void *pvUser) { PRTMEMBLOCK pBlock = (PRTMEMBLOCK)pNode; fprintf(stderr, "%p %08lx %p\n", pBlock->Core.Key, (long)pBlock->cb, pBlock->pvCaller); return 0; } /** * Dumps the allocated blocks. * This is something which you should call from gdb. */ extern "C" void RTMemDump(void); void RTMemDump(void) { fprintf(stderr, "address size caller\n"); RTAvlPVDoWithAll(&g_BlocksTree, true, RTMemDumpOne, NULL); } #ifdef RTALLOC_EFENCE_FREE_DELAYED /** * Insert a delayed block. */ static inline void rtmemBlockDelayInsert(PRTMEMBLOCK pBlock) { size_t cbBlock = RT_ALIGN_Z(pBlock->cb, PAGE_SIZE) + RTALLOC_EFENCE_SIZE; pBlock->Core.pRight = NULL; pBlock->Core.pLeft = NULL; rtmemBlockLock(); if (g_pBlocksDelayHead) { g_pBlocksDelayHead->Core.pLeft = (PAVLPVNODECORE)pBlock; pBlock->Core.pRight = (PAVLPVNODECORE)g_pBlocksDelayHead; g_pBlocksDelayHead = pBlock; } else { g_pBlocksDelayTail = pBlock; g_pBlocksDelayHead = pBlock; } g_cbBlocksDelay += cbBlock; rtmemBlockUnlock(); } /** * Removes a delayed block. */ static inline PRTMEMBLOCK rtmemBlockDelayRemove(void) { PRTMEMBLOCK pBlock = NULL; rtmemBlockLock(); if (g_cbBlocksDelay > RTALLOC_EFENCE_FREE_DELAYED) { pBlock = g_pBlocksDelayTail; if (pBlock) { g_pBlocksDelayTail = (PRTMEMBLOCK)pBlock->Core.pLeft; if (pBlock->Core.pLeft) pBlock->Core.pLeft->pRight = NULL; else g_pBlocksDelayHead = NULL; g_cbBlocksDelay -= RT_ALIGN_Z(pBlock->cb, PAGE_SIZE) + RTALLOC_EFENCE_SIZE; } } rtmemBlockUnlock(); return pBlock; } #endif /* DELAY */ #endif /* RTALLOC_EFENCE_TRACE */ /** * Internal allocator. */ RTDECL(void *) rtMemAlloc(const char *pszOp, RTMEMTYPE enmType, size_t cb, void *pvCaller, unsigned iLine, const char *pszFile, const char *pszFunction) { /* * Sanity. */ if ( RT_ALIGN_Z(RTALLOC_EFENCE_SIZE, PAGE_SIZE) != RTALLOC_EFENCE_SIZE && RTALLOC_EFENCE_SIZE <= 0) { rtmemComplain(pszOp, "Invalid E-fence size! %#x\n", RTALLOC_EFENCE_SIZE); return NULL; } if (!cb) { #if 0 rtmemComplain(pszOp, "Request of ZERO bytes allocation!\n"); return NULL; #else cb = 1; #endif } #ifdef RTALLOC_EFENCE_TRACE /* * Allocate the trace block. */ PRTMEMBLOCK pBlock = rtmemBlockCreate(enmType, cb, pvCaller, iLine, pszFile, pszFunction); if (!pBlock) { rtmemComplain(pszOp, "Failed to allocate trace block!\n"); return NULL; } #endif /* * Allocate a block with page alignment space + the size of the E-fence. */ size_t cbBlock = RT_ALIGN_Z(cb, PAGE_SIZE) + RTALLOC_EFENCE_SIZE; void *pvBlock = RTMemPageAlloc(cbBlock); if (pvBlock) { /* * Calc the start of the fence and the user block * and then change the page protection of the fence. */ #ifdef RTALLOC_EFENCE_IN_FRONT void *pvEFence = pvBlock; void *pv = (char *)pvEFence + RTALLOC_EFENCE_SIZE; #else void *pvEFence = (char *)pvBlock + (cbBlock - RTALLOC_EFENCE_SIZE); void *pv = (char *)pvEFence - cb; #endif int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_NONE); if (!rc) { #ifdef RTALLOC_EFENCE_TRACE rtmemBlockInsert(pBlock, pv); #endif if (enmType == RTMEMTYPE_RTMEMALLOCZ) memset(pv, 0, cb); #ifdef RTALLOC_EFENCE_FILLER else memset(pv, RTALLOC_EFENCE_FILLER, cb); #endif rtmemLog(pszOp, "returns %p (pvBlock=%p cbBlock=%#x pvEFence=%p cb=%#x)\n", pv, pvBlock, cbBlock, pvEFence, cb); return pv; } rtmemComplain(pszOp, "RTMemProtect failed, pvEFence=%p size %d, rc=%d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc); RTMemPageFree(pvBlock); } else rtmemComplain(pszOp, "Failed to allocated %d bytes.\n", cb); #ifdef RTALLOC_EFENCE_TRACE rtmemBlockFree(pBlock); #endif return NULL; } /** * Internal free. */ RTDECL(void) rtMemFree(const char *pszOp, RTMEMTYPE enmType, void *pv, void *pvCaller, unsigned iLine, const char *pszFile, const char *pszFunction) { /* * Simple case. */ if (!pv) return; /* * Check watch points. */ for (unsigned i = 0; i < ELEMENTS(gapvRTMemFreeWatch); i++) if (gapvRTMemFreeWatch[i] == pv) AssertReleaseBreakpoint(); #ifdef RTALLOC_EFENCE_TRACE /* * Find the block. */ PRTMEMBLOCK pBlock = rtmemBlockRemove(pv); if (pBlock) { if (gfRTMemFreeLog) RTLogPrintf("RTMem %s: pv=%p pvCaller=%p cb=%#x\n", pszOp, pv, pvCaller, pBlock->cb); #ifdef RTALLOC_EFENCE_FREE_FILL /* * Fill the user part of the block. */ memset(pv, RTALLOC_EFENCE_FREE_FILL, pBlock->cb); #endif #if defined(RTALLOC_EFENCE_FREE_DELAYED) && RTALLOC_EFENCE_FREE_DELAYED > 0 /* * We're doing delayed freeing. * That means we'll expand the E-fence to cover the entire block. */ int rc = RTMemProtect(pv, pBlock->cb, RTMEM_PROT_NONE); if (RT_SUCCESS(rc)) { /* * Insert it into the free list and process pending frees. */ rtmemBlockDelayInsert(pBlock); while ((pBlock = rtmemBlockDelayRemove()) != NULL) { pv = pBlock->Core.Key; #ifdef RTALLOC_EFENCE_IN_FRONT void *pvBlock = (char *)pv - RTALLOC_EFENCE_SIZE; #else void *pvBlock = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK); #endif size_t cbBlock = RT_ALIGN_Z(pBlock->cb, PAGE_SIZE) + RTALLOC_EFENCE_SIZE; rc = RTMemProtect(pvBlock, cbBlock, RTMEM_PROT_READ | RTMEM_PROT_WRITE); if (RT_SUCCESS(rc)) RTMemPageFree(pvBlock); else rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ | RTMEM_PROT_WRITE) -> %d\n", pvBlock, cbBlock, rc); rtmemBlockFree(pBlock); } } else rtmemComplain(pszOp, "Failed to expand the efence of pv=%p cb=%d, rc=%d.\n", pv, pBlock, rc); #else /* !RTALLOC_EFENCE_FREE_DELAYED */ /* * Turn of the E-fence and free it. */ #ifdef RTALLOC_EFENCE_IN_FRONT void *pvBlock = (char *)pv - RTALLOC_EFENCE_SIZE; void *pvEFence = pvBlock; #else void *pvBlock = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK); void *pvEFence = (char *)pv + pBlock->cb; #endif int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_READ | RTMEM_PROT_WRITE); if (RT_SUCCESS(rc)) RTMemPageFree(pvBlock); else rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ | RTMEM_PROT_WRITE) -> %d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc); rtmemBlockFree(pBlock); #endif /* !RTALLOC_EFENCE_FREE_DELAYED */ } else rtmemComplain(pszOp, "pv=%p not found! Incorrect free!\n", pv); #else /* !RTALLOC_EFENCE_TRACE */ /* * We have no size tracking, so we're not doing any freeing because * we cannot if the E-fence is after the block. * Let's just expand the E-fence to the first page of the user bit * since we know that it's around. */ int rc = RTMemProtect((void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK), PAGE_SIZE, RTMEM_PROT_NONE); if (RT_FAILURE(rc)) rtmemComplain(pszOp, "RTMemProtect(%p, PAGE_SIZE, RTMEM_PROT_NONE) -> %d\n", (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK), rc); #endif /* !RTALLOC_EFENCE_TRACE */ } /** * Internal realloc. */ RTDECL(void *) rtMemRealloc(const char *pszOp, RTMEMTYPE enmType, void *pvOld, size_t cbNew, void *pvCaller, unsigned iLine, const char *pszFile, const char *pszFunction) { /* * Allocate new and copy. */ if (!pvOld) return rtMemAlloc(pszOp, enmType, cbNew, pvCaller, iLine, pszFile, pszFunction); if (!cbNew) { rtMemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, pvCaller, iLine, pszFile, pszFunction); return NULL; } #ifdef RTALLOC_EFENCE_TRACE /* * Get the block, allocate the new, copy the data, free the old one. */ PRTMEMBLOCK pBlock = rtmemBlockGet(pvOld); if (pBlock) { void *pvRet = rtMemAlloc(pszOp, enmType, cbNew, pvCaller, iLine, pszFile, pszFunction); if (pvRet) { memcpy(pvRet, pvOld, RT_MIN(cbNew, pBlock->cb)); rtMemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, pvCaller, iLine, pszFile, pszFunction); } return pvRet; } else rtmemComplain(pszOp, "pvOld=%p was not found!\n", pvOld); return NULL; #else /* !RTALLOC_EFENCE_TRACE */ rtmemComplain(pszOp, "Not supported if RTALLOC_EFENCE_TRACE isn't defined!\n"); return NULL; #endif /* !RTALLOC_EFENCE_TRACE */ } /** * Same as RTMemTmpAlloc() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfTmpAlloc(size_t cb) { return RTMemEfAlloc(cb); } /** * Same as RTMemTmpAllocZ() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfTmpAllocZ(size_t cb) { return RTMemEfAllocZ(cb); } /** * Same as RTMemTmpFree() except that it's for fenced memory. * * @param pv Pointer to memory block. */ RTDECL(void) RTMemEfTmpFree(void *pv) { RTMemEfFree(pv); } /** * Same as RTMemAlloc() except that it's fenced. * * @returns Pointer to the allocated memory. Free with RTMemEfFree(). * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfAlloc(size_t cb) { return rtMemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cb, ((void **)&cb)[-1], 0, NULL, NULL); } /** * Same as RTMemAllocZ() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param cb Size in bytes of the memory block to allocate. */ RTDECL(void *) RTMemEfAllocZ(size_t cb) { return rtMemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, ((void **)&cb)[-1], 0, NULL, NULL); } /** * Same as RTMemRealloc() except that it's fenced. * * @returns Pointer to the allocated memory. * @returns NULL on failure. * @param pvOld The memory block to reallocate. * @param cbNew The new block size (in bytes). */ RTDECL(void *) RTMemEfRealloc(void *pvOld, size_t cbNew) { return rtMemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, ((void **)&pvOld)[-1], 0, NULL, NULL); } /** * Free memory allocated by any of the RTMemEf* allocators. * * @param pv Pointer to memory block. */ RTDECL(void) RTMemEfFree(void *pv) { if (pv) rtMemFree("Free", RTMEMTYPE_RTMEMFREE, pv, ((void **)&pv)[-1], 0, NULL, NULL); } /** * Same as RTMemDup() except that it's fenced. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cb The amount of memory to duplicate. */ RTDECL(void *) RTMemEfDup(const void *pvSrc, size_t cb) { void *pvDst = RTMemEfAlloc(cb); if (pvDst) memcpy(pvDst, pvSrc, cb); return pvDst; } /** * Same as RTMemDupEx except that it's fenced. * * @returns New heap block with the duplicate data. * @returns NULL if we're out of memory. * @param pvSrc The memory to duplicate. * @param cbSrc The amount of memory to duplicate. * @param cbExtra The amount of extra memory to allocate and zero. */ RTDECL(void *) RTMemEfDupEx(const void *pvSrc, size_t cbSrc, size_t cbExtra) { void *pvDst = RTMemEfAlloc(cbSrc + cbExtra); if (pvDst) { memcpy(pvDst, pvSrc, cbSrc); memset((uint8_t *)pvDst + cbSrc, 0, cbExtra); } return pvDst; }