alloc-ef.cpp@ 99196

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1	/* $Id: alloc-ef.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocation, electric fence.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include "alloc-ef.h"
42	#include <iprt/mem.h>
43	#include <iprt/log.h>
44	#include <iprt/asm.h>
45	#include <iprt/thread.h>
46	#include <VBox/sup.h>
47	#include <iprt/errcore.h>
48	#ifndef IPRT_NO_CRT
49	# include <errno.h>
50	# include <stdio.h>
51	# include <stdlib.h>
52	#endif
53
54	#include <iprt/alloc.h>
55	#include <iprt/assert.h>
56	#include <iprt/param.h>
57	#include <iprt/string.h>
58
59	#ifdef RTALLOC_REPLACE_MALLOC
60	# include <VBox/dis.h>
61	# include <VBox/disopcode.h>
62	# include <dlfcn.h>
63	# ifdef RT_OS_DARWIN
64	# include <malloc/malloc.h>
65	# endif
66	#endif
67
68
69	/*********************************************************************************************************************************
70	* Defined Constants And Macros *
71	*********************************************************************************************************************************/
72	#ifdef RTALLOC_REPLACE_MALLOC
73	# define RTMEM_REPLACMENT_ALIGN(a_cb) ((a_cb) >= 16 ? RT_ALIGN_Z(a_cb, 16) \
74	: (a_cb) >= sizeof(uintptr_t) ? RT_ALIGN_Z(a_cb, sizeof(uintptr_t)) : (a_cb))
75	#endif
76
77
78	/*********************************************************************************************************************************
79	* Global Variables *
80	*********************************************************************************************************************************/
81	#ifdef RTALLOC_EFENCE_TRACE
82	/** Spinlock protecting the all the block's globals. */
83	static volatile uint32_t g_BlocksLock;
84	/** Tree tracking the allocations. */
85	static AVLPVTREE g_BlocksTree;
86	# ifdef RTALLOC_EFENCE_FREE_DELAYED
87	/** Tail of the delayed blocks. */
88	static volatile PRTMEMBLOCK g_pBlocksDelayHead;
89	/** Tail of the delayed blocks. */
90	static volatile PRTMEMBLOCK g_pBlocksDelayTail;
91	/** Number of bytes in the delay list (includes fences). */
92	static volatile size_t g_cbBlocksDelay;
93	# endif /* RTALLOC_EFENCE_FREE_DELAYED */
94	# ifdef RTALLOC_REPLACE_MALLOC
95	/** @name For calling the real allocation API we've replaced.
96	* @{ */
97	void * (*g_pfnOrgMalloc)(size_t);
98	void * (*g_pfnOrgCalloc)(size_t, size_t);
99	void * (g_pfnOrgRealloc)(void , size_t);
100	void (g_pfnOrgFree)(void );
101	size_t (g_pfnOrgMallocSize)(void );
102	/** @} */
103	# endif
104	#endif /* RTALLOC_EFENCE_TRACE */
105	/** Array of pointers free watches for. */
106	void *gapvRTMemFreeWatch[4] = {NULL, NULL, NULL, NULL};
107	/** Enable logging of all freed memory. */
108	bool gfRTMemFreeLog = false;
109
110
111	/*********************************************************************************************************************************
112	* Internal Functions *
113	*********************************************************************************************************************************/
114	#ifdef RTALLOC_REPLACE_MALLOC
115	static void rtMemReplaceMallocAndFriends(void);
116	#endif
117
118
119	/**
120	* Complains about something.
121	*/
122	static void rtmemComplain(const char pszOp, const char pszFormat, ...)
123	{
124	va_list args;
125	fprintf(stderr, "RTMem error: %s: ", pszOp);
126	va_start(args, pszFormat);
127	vfprintf(stderr, pszFormat, args);
128	va_end(args);
129	RTAssertDoPanic();
130	}
131
132	/**
133	* Log an event.
134	*/
135	DECLINLINE(void) rtmemLog(const char pszOp, const char pszFormat, ...)
136	{
137	#if 0
138	va_list args;
139	fprintf(stderr, "RTMem info: %s: ", pszOp);
140	va_start(args, pszFormat);
141	vfprintf(stderr, pszFormat, args);
142	va_end(args);
143	#else
144	NOREF(pszOp); NOREF(pszFormat);
145	#endif
146	}
147
148
149	#ifdef RTALLOC_EFENCE_TRACE
150
151	/**
152	* Acquires the lock.
153	*/
154	DECLINLINE(void) rtmemBlockLock(void)
155	{
156	unsigned c = 0;
157	while (!ASMAtomicCmpXchgU32(&g_BlocksLock, 1, 0))
158	RTThreadSleepNoLog(((++c) >> 2) & 31);
159	}
160
161
162	/**
163	* Releases the lock.
164	*/
165	DECLINLINE(void) rtmemBlockUnlock(void)
166	{
167	Assert(g_BlocksLock == 1);
168	ASMAtomicXchgU32(&g_BlocksLock, 0);
169	}
170
171
172	/**
173	* Creates a block.
174	*/
175	DECLINLINE(PRTMEMBLOCK) rtmemBlockCreate(RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
176	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
177	{
178	# ifdef RTALLOC_REPLACE_MALLOC
179	if (!g_pfnOrgMalloc)
180	rtMemReplaceMallocAndFriends();
181	PRTMEMBLOCK pBlock = (PRTMEMBLOCK)g_pfnOrgMalloc(sizeof(*pBlock));
182	# else
183	PRTMEMBLOCK pBlock = (PRTMEMBLOCK)malloc(sizeof(*pBlock));
184	# endif
185	if (pBlock)
186	{
187	pBlock->enmType = enmType;
188	pBlock->cbUnaligned = cbUnaligned;
189	pBlock->cbAligned = cbAligned;
190	pBlock->pszTag = pszTag;
191	pBlock->pvCaller = pvCaller;
192	pBlock->iLine = iLine;
193	pBlock->pszFile = pszFile;
194	pBlock->pszFunction = pszFunction;
195	}
196	return pBlock;
197	}
198
199
200	/**
201	* Frees a block.
202	*/
203	DECLINLINE(void) rtmemBlockFree(PRTMEMBLOCK pBlock)
204	{
205	# ifdef RTALLOC_REPLACE_MALLOC
206	g_pfnOrgFree(pBlock);
207	# else
208	free(pBlock);
209	# endif
210	}
211
212
213	/**
214	* Insert a block from the tree.
215	*/
216	DECLINLINE(void) rtmemBlockInsert(PRTMEMBLOCK pBlock, void *pv)
217	{
218	pBlock->Core.Key = pv;
219	rtmemBlockLock();
220	bool fRc = RTAvlPVInsert(&g_BlocksTree, &pBlock->Core);
221	rtmemBlockUnlock();
222	AssertRelease(fRc);
223	}
224
225
226	/**
227	* Remove a block from the tree and returns it to the caller.
228	*/
229	DECLINLINE(PRTMEMBLOCK) rtmemBlockRemove(void *pv)
230	{
231	rtmemBlockLock();
232	PRTMEMBLOCK pBlock = (PRTMEMBLOCK)RTAvlPVRemove(&g_BlocksTree, pv);
233	rtmemBlockUnlock();
234	return pBlock;
235	}
236
237	/**
238	* Gets a block.
239	*/
240	DECLINLINE(PRTMEMBLOCK) rtmemBlockGet(void *pv)
241	{
242	rtmemBlockLock();
243	PRTMEMBLOCK pBlock = (PRTMEMBLOCK)RTAvlPVGet(&g_BlocksTree, pv);
244	rtmemBlockUnlock();
245	return pBlock;
246	}
247
248	/**
249	* Dumps one allocation.
250	*/
251	static DECLCALLBACK(int) RTMemDumpOne(PAVLPVNODECORE pNode, void *pvUser)
252	{
253	PRTMEMBLOCK pBlock = (PRTMEMBLOCK)pNode;
254	fprintf(stderr, "%p %08lx(+%02lx) %p\n",
255	pBlock->Core.Key,
256	(unsigned long)pBlock->cbUnaligned,
257	(unsigned long)(pBlock->cbAligned - pBlock->cbUnaligned),
258	pBlock->pvCaller);
259	NOREF(pvUser);
260	return 0;
261	}
262
263	/**
264	* Dumps the allocated blocks.
265	* This is something which you should call from gdb.
266	*/
267	extern "C" void RTMemDump(void);
268	void RTMemDump(void)
269	{
270	fprintf(stderr, "address size(alg) caller\n");
271	RTAvlPVDoWithAll(&g_BlocksTree, true, RTMemDumpOne, NULL);
272	}
273
274	# ifdef RTALLOC_EFENCE_FREE_DELAYED
275
276	/**
277	* Insert a delayed block.
278	*/
279	DECLINLINE(void) rtmemBlockDelayInsert(PRTMEMBLOCK pBlock)
280	{
281	size_t cbBlock = RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
282	pBlock->Core.pRight = NULL;
283	pBlock->Core.pLeft = NULL;
284	rtmemBlockLock();
285	if (g_pBlocksDelayHead)
286	{
287	g_pBlocksDelayHead->Core.pLeft = (PAVLPVNODECORE)pBlock;
288	pBlock->Core.pRight = (PAVLPVNODECORE)g_pBlocksDelayHead;
289	g_pBlocksDelayHead = pBlock;
290	}
291	else
292	{
293	g_pBlocksDelayTail = pBlock;
294	g_pBlocksDelayHead = pBlock;
295	}
296	g_cbBlocksDelay += cbBlock;
297	rtmemBlockUnlock();
298	}
299
300	/**
301	* Removes a delayed block.
302	*/
303	DECLINLINE(PRTMEMBLOCK) rtmemBlockDelayRemove(void)
304	{
305	PRTMEMBLOCK pBlock = NULL;
306	rtmemBlockLock();
307	if (g_cbBlocksDelay > RTALLOC_EFENCE_FREE_DELAYED)
308	{
309	pBlock = g_pBlocksDelayTail;
310	if (pBlock)
311	{
312	g_pBlocksDelayTail = (PRTMEMBLOCK)pBlock->Core.pLeft;
313	if (pBlock->Core.pLeft)
314	pBlock->Core.pLeft->pRight = NULL;
315	else
316	g_pBlocksDelayHead = NULL;
317	g_cbBlocksDelay -= RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
318	}
319	}
320	rtmemBlockUnlock();
321	return pBlock;
322	}
323
324
325	/**
326	* Dumps the freed blocks.
327	* This is something which you should call from gdb.
328	*/
329	extern "C" void RTMemDumpFreed(void);
330	void RTMemDumpFreed(void)
331	{
332	fprintf(stderr, "address size(alg) caller\n");
333	for (PRTMEMBLOCK pCur = g_pBlocksDelayHead; pCur; pCur = (PRTMEMBLOCK)pCur->Core.pRight)
334	RTMemDumpOne(&pCur->Core, NULL);
335
336	}
337
338	# endif /* RTALLOC_EFENCE_FREE_DELAYED */
339
340	#endif /* RTALLOC_EFENCE_TRACE */
341
342
343	#if defined(RTALLOC_REPLACE_MALLOC) && defined(RTALLOC_EFENCE_TRACE)
344	/*
345	*
346	* Replacing malloc, calloc, realloc, & free.
347	*
348	*/
349
350	/** Replacement for malloc. */
351	static void *rtMemReplacementMalloc(size_t cb)
352	{
353	size_t cbAligned = RTMEM_REPLACMENT_ALIGN(cb);
354	void *pv = rtR3MemAlloc("r-malloc", RTMEMTYPE_RTMEMALLOC, cb, cbAligned, "heap", ASMReturnAddress(), RT_SRC_POS);
355	if (!pv)
356	pv = g_pfnOrgMalloc(cb);
357	return pv;
358	}
359
360	/** Replacement for calloc. */
361	static void *rtMemReplacementCalloc(size_t cbItem, size_t cItems)
362	{
363	size_t cb = cbItem * cItems;
364	size_t cbAligned = RTMEM_REPLACMENT_ALIGN(cb);
365	void *pv = rtR3MemAlloc("r-calloc", RTMEMTYPE_RTMEMALLOCZ, cb, cbAligned, "heap", ASMReturnAddress(), RT_SRC_POS);
366	if (!pv)
367	pv = g_pfnOrgCalloc(cbItem, cItems);
368	return pv;
369	}
370
371	/** Replacement for realloc. */
372	static void rtMemReplacementRealloc(void pvOld, size_t cbNew)
373	{
374	if (pvOld)
375	{
376	/* We're not strict about where the memory was allocated. */
377	PRTMEMBLOCK pBlock = rtmemBlockGet(pvOld);
378	if (pBlock)
379	{
380	size_t cbAligned = RTMEM_REPLACMENT_ALIGN(cbNew);
381	return rtR3MemRealloc("r-realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbAligned, "heap", ASMReturnAddress(), RT_SRC_POS);
382	}
383	return g_pfnOrgRealloc(pvOld, cbNew);
384	}
385	return rtMemReplacementMalloc(cbNew);
386	}
387
388	/** Replacement for free(). */
389	static void rtMemReplacementFree(void *pv)
390	{
391	if (pv)
392	{
393	/* We're not strict about where the memory was allocated. */
394	PRTMEMBLOCK pBlock = rtmemBlockGet(pv);
395	if (pBlock)
396	rtR3MemFree("r-free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), RT_SRC_POS);
397	else
398	g_pfnOrgFree(pv);
399	}
400	}
401
402	# ifdef RT_OS_DARWIN
403	/** Replacement for malloc. */
404	static size_t rtMemReplacementMallocSize(void *pv)
405	{
406	size_t cb;
407	if (pv)
408	{
409	/* We're not strict about where the memory was allocated. */
410	PRTMEMBLOCK pBlock = rtmemBlockGet(pv);
411	if (pBlock)
412	cb = pBlock->cbUnaligned;
413	else
414	cb = g_pfnOrgMallocSize(pv);
415	}
416	else
417	cb = 0;
418	return cb;
419	}
420	# endif
421
422
423	static void rtMemReplaceMallocAndFriends(void)
424	{
425	struct
426	{
427	const char *pszName;
428	PFNRT pfnReplacement;
429	PFNRT pfnOrg;
430	PFNRT *ppfnJumpBack;
431	} aApis[] =
432	{
433	{ "free", (PFNRT)rtMemReplacementFree, (PFNRT)free, (PFNRT *)&g_pfnOrgFree },
434	{ "realloc", (PFNRT)rtMemReplacementRealloc, (PFNRT)realloc, (PFNRT *)&g_pfnOrgRealloc },
435	{ "calloc", (PFNRT)rtMemReplacementCalloc, (PFNRT)calloc, (PFNRT *)&g_pfnOrgCalloc },
436	{ "malloc", (PFNRT)rtMemReplacementMalloc, (PFNRT)malloc, (PFNRT *)&g_pfnOrgMalloc },
437	#ifdef RT_OS_DARWIN
438	{ "malloc_size", (PFNRT)rtMemReplacementMallocSize, (PFNRT)malloc_size, (PFNRT *)&g_pfnOrgMallocSize },
439	#endif
440	};
441
442	/*
443	* Initialize the jump backs to avoid recursivly entering this function.
444	*/
445	for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
446	*aApis[i].ppfnJumpBack = aApis[i].pfnOrg;
447
448	/*
449	* Give the user an option to skip replacing malloc.
450	*/
451	if (getenv("IPRT_DONT_REPLACE_MALLOC"))
452	return;
453
454	/*
455	* Allocate a page for jump back code (we leak it).
456	*/
457	uint8_t pbExecPage = (uint8_t )RTMemPageAlloc(PAGE_SIZE); AssertFatal(pbExecPage);
458	int rc = RTMemProtect(pbExecPage, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC); AssertFatalRC(rc);
459
460	/*
461	* Do the ground work.
462	*/
463	uint8_t *pb = pbExecPage;
464	for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
465	{
466	/* Resolve it. */
467	PFNRT pfnOrg = (PFNRT)(uintptr_t)dlsym(RTLD_DEFAULT, aApis[i].pszName);
468	if (pfnOrg)
469	aApis[i].pfnOrg = pfnOrg;
470	else
471	pfnOrg = aApis[i].pfnOrg;
472
473	/* Figure what we can replace and how much to duplicate in the jump back code. */
474	# ifdef RT_ARCH_AMD64
475	uint32_t cbNeeded = 12;
476	DISCPUMODE const enmCpuMode = DISCPUMODE_64BIT;
477	# elif defined(RT_ARCH_X86)
478	uint32_t const cbNeeded = 5;
479	DISCPUMODE const enmCpuMode = DISCPUMODE_32BIT;
480	# else
481	# error "Port me"
482	# endif
483	uint32_t offJmpBack = 0;
484	uint32_t cbCopy = 0;
485	while (offJmpBack < cbNeeded)
486	{
487	DISCPUSTATE Dis;
488	uint32_t cbInstr = 1;
489	rc = DISInstr((void *)((uintptr_t)pfnOrg + offJmpBack), enmCpuMode, &Dis, &cbInstr); AssertFatalRC(rc);
490	AssertFatal(!(Dis.pCurInstr->fOpType & (DISOPTYPE_CONTROLFLOW)));
491	# ifdef RT_ARCH_AMD64
492	# ifdef RT_OS_DARWIN
493	/* Kludge for: cmp [malloc_def_zone_state], 1; jg 2; call _malloc_initialize; 2: */
494	if ( Dis.ModRM.Bits.Mod == 0
495	&& Dis.ModRM.Bits.Rm == 5 /* wrt RIP */
496	&& (Dis.Param2.fUse & (DISUSE_IMMEDIATE16_SX8 \| DISUSE_IMMEDIATE32_SX8 \| DISUSE_IMMEDIATE64_SX8))
497	&& Dis.Param2.uValue == 1
498	&& Dis.pCurInstr->uOpcode == OP_CMP)
499	{
500	cbCopy = offJmpBack;
501
502	offJmpBack += cbInstr;
503	rc = DISInstr((void *)((uintptr_t)pfnOrg + offJmpBack), enmCpuMode, &Dis, &cbInstr); AssertFatalRC(rc);
504	if ( Dis.pCurInstr->uOpcode == OP_JNBE
505	&& Dis.Param1.uDisp.i8 == 5)
506	{
507	offJmpBack += cbInstr + 5;
508	AssertFatal(offJmpBack >= cbNeeded);
509	break;
510	}
511	}
512	# endif
513	AssertFatal(!(Dis.ModRM.Bits.Mod == 0 && Dis.ModRM.Bits.Rm == 5 /* wrt RIP */));
514	# endif
515	offJmpBack += cbInstr;
516	}
517	if (!cbCopy)
518	cbCopy = offJmpBack;
519
520	/* Assemble the jump back. */
521	memcpy(pb, (void *)(uintptr_t)pfnOrg, cbCopy);
522	uint32_t off = cbCopy;
523	# ifdef RT_ARCH_AMD64
524	pb[off++] = 0xff; /* jmp qword [$+8 wrt RIP] */
525	pb[off++] = 0x25;
526	(uint32_t )&pb[off] = 0;
527	off += 4;
528	(uint64_t )&pb[off] = (uintptr_t)pfnOrg + offJmpBack;
529	off += 8;
530	off = RT_ALIGN_32(off, 16);
531	# elif defined(RT_ARCH_X86)
532	pb[off++] = 0xe9; /* jmp rel32 */
533	(uint32_t )&pb[off] = (uintptr_t)pfnOrg + offJmpBack - (uintptr_t)&pb[4];
534	off += 4;
535	off = RT_ALIGN_32(off, 8);
536	# else
537	# error "Port me"
538	# endif
539	*aApis[i].ppfnJumpBack = (PFNRT)(uintptr_t)pb;
540	pb += off;
541	}
542
543	/*
544	* Modify the APIs.
545	*/
546	for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
547	{
548	pb = (uint8_t *)(uintptr_t)aApis[i].pfnOrg;
549	rc = RTMemProtect(pb, 16, RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC); AssertFatalRC(rc);
550
551	# ifdef RT_ARCH_AMD64
552	/* Assemble the LdrLoadDll patch. */
553	pb++ = 0x48; / mov rax, qword */
554	*pb++ = 0xb8;
555	(uint64_t )pb = (uintptr_t)aApis[i].pfnReplacement;
556	pb += 8;
557	pb++ = 0xff; / jmp rax */
558	*pb++ = 0xe0;
559	# elif defined(RT_ARCH_X86)
560	pb++ = 0xe9; / jmp rel32 */
561	(uint32_t )pb = (uintptr_t)aApis[i].pfnReplacement - (uintptr_t)&pb[4];
562	# else
563	# error "Port me"
564	# endif
565	}
566	}
567
568	#endif /* RTALLOC_REPLACE_MALLOC && RTALLOC_EFENCE_TRACE */
569
570
571	/**
572	* Internal allocator.
573	*/
574	RTDECL(void ) rtR3MemAlloc(const char pszOp, RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
575	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
576	{
577	/*
578	* Sanity.
579	*/
580	if ( RT_ALIGN_Z(RTALLOC_EFENCE_SIZE, PAGE_SIZE) != RTALLOC_EFENCE_SIZE
581	&& RTALLOC_EFENCE_SIZE <= 0)
582	{
583	rtmemComplain(pszOp, "Invalid E-fence size! %#x\n", RTALLOC_EFENCE_SIZE);
584	return NULL;
585	}
586	if (!cbUnaligned)
587	{
588	#if 0
589	rtmemComplain(pszOp, "Request of ZERO bytes allocation!\n");
590	return NULL;
591	#else
592	cbAligned = cbUnaligned = 1;
593	#endif
594	}
595
596	#ifndef RTALLOC_EFENCE_IN_FRONT
597	/* Alignment decreases fence accuracy, but this is at least partially
598	* counteracted by filling and checking the alignment padding. When the
599	* fence is in front then then no extra alignment is needed. */
600	cbAligned = RT_ALIGN_Z(cbAligned, RTALLOC_EFENCE_ALIGNMENT);
601	#endif
602
603	#ifdef RTALLOC_EFENCE_TRACE
604	/*
605	* Allocate the trace block.
606	*/
607	PRTMEMBLOCK pBlock = rtmemBlockCreate(enmType, cbUnaligned, cbAligned, pszTag, pvCaller, RT_SRC_POS_ARGS);
608	if (!pBlock)
609	{
610	rtmemComplain(pszOp, "Failed to allocate trace block!\n");
611	return NULL;
612	}
613	#endif
614
615	/*
616	* Allocate a block with page alignment space + the size of the E-fence.
617	*/
618	size_t cbBlock = RT_ALIGN_Z(cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
619	void *pvBlock = RTMemPageAlloc(cbBlock);
620	if (pvBlock)
621	{
622	/*
623	* Calc the start of the fence and the user block
624	* and then change the page protection of the fence.
625	*/
626	#ifdef RTALLOC_EFENCE_IN_FRONT
627	void *pvEFence = pvBlock;
628	void pv = (char )pvEFence + RTALLOC_EFENCE_SIZE;
629	# ifdef RTALLOC_EFENCE_NOMAN_FILLER
630	memset((char *)pv + cbUnaligned, RTALLOC_EFENCE_NOMAN_FILLER, cbBlock - RTALLOC_EFENCE_SIZE - cbUnaligned);
631	# endif
632	#else
633	void pvEFence = (char )pvBlock + (cbBlock - RTALLOC_EFENCE_SIZE);
634	void pv = (char )pvEFence - cbAligned;
635	# ifdef RTALLOC_EFENCE_NOMAN_FILLER
636	memset(pvBlock, RTALLOC_EFENCE_NOMAN_FILLER, cbBlock - RTALLOC_EFENCE_SIZE - cbAligned);
637	memset((char *)pv + cbUnaligned, RTALLOC_EFENCE_NOMAN_FILLER, cbAligned - cbUnaligned);
638	# endif
639	#endif
640
641	#ifdef RTALLOC_EFENCE_FENCE_FILLER
642	memset(pvEFence, RTALLOC_EFENCE_FENCE_FILLER, RTALLOC_EFENCE_SIZE);
643	#endif
644	int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_NONE);
645	if (!rc)
646	{
647	#ifdef RTALLOC_EFENCE_TRACE
648	rtmemBlockInsert(pBlock, pv);
649	#endif
650	if (enmType == RTMEMTYPE_RTMEMALLOCZ)
651	memset(pv, 0, cbUnaligned);
652	#ifdef RTALLOC_EFENCE_FILLER
653	else
654	memset(pv, RTALLOC_EFENCE_FILLER, cbUnaligned);
655	#endif
656
657	rtmemLog(pszOp, "returns %p (pvBlock=%p cbBlock=%#x pvEFence=%p cbUnaligned=%#x)\n", pv, pvBlock, cbBlock, pvEFence, cbUnaligned);
658	return pv;
659	}
660	rtmemComplain(pszOp, "RTMemProtect failed, pvEFence=%p size %d, rc=%d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc);
661	RTMemPageFree(pvBlock, cbBlock);
662	}
663	else
664	rtmemComplain(pszOp, "Failed to allocated %lu (%lu) bytes.\n", (unsigned long)cbBlock, (unsigned long)cbUnaligned);
665
666	#ifdef RTALLOC_EFENCE_TRACE
667	rtmemBlockFree(pBlock);
668	#endif
669	return NULL;
670	}
671
672
673	/**
674	* Internal free.
675	*/
676	RTDECL(void) rtR3MemFree(const char pszOp, RTMEMTYPE enmType, void pv, size_t cbUser, void *pvCaller, RT_SRC_POS_DECL)
677	{
678	NOREF(enmType); RT_SRC_POS_NOREF();
679
680	/*
681	* Simple case.
682	*/
683	if (!pv)
684	return;
685
686	/*
687	* Check watch points.
688	*/
689	for (unsigned i = 0; i < RT_ELEMENTS(gapvRTMemFreeWatch); i++)
690	if (gapvRTMemFreeWatch[i] == pv)
691	RTAssertDoPanic();
692
693	#ifdef RTALLOC_EFENCE_TRACE
694	/*
695	* Find the block.
696	*/
697	PRTMEMBLOCK pBlock = rtmemBlockRemove(pv);
698	if (pBlock)
699	{
700	if (gfRTMemFreeLog)
701	RTLogPrintf("RTMem %s: pv=%p pvCaller=%p cbUnaligned=%#x\n", pszOp, pv, pvCaller, pBlock->cbUnaligned);
702
703	# ifdef RTALLOC_EFENCE_NOMAN_FILLER
704	/*
705	* Check whether the no man's land is untouched.
706	*/
707	# ifdef RTALLOC_EFENCE_IN_FRONT
708	void pvWrong = ASMMemFirstMismatchingU8((char )pv + pBlock->cbUnaligned,
709	RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbUnaligned,
710	RTALLOC_EFENCE_NOMAN_FILLER);
711	# else
712	/* Alignment must match allocation alignment in rtMemAlloc(). */
713	void pvWrong = ASMMemFirstMismatchingU8((char )pv + pBlock->cbUnaligned,
714	pBlock->cbAligned - pBlock->cbUnaligned,
715	RTALLOC_EFENCE_NOMAN_FILLER);
716	if (pvWrong)
717	RTAssertDoPanic();
718	pvWrong = ASMMemFirstMismatchingU8((void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK),
719	RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbAligned,
720	RTALLOC_EFENCE_NOMAN_FILLER);
721	# endif
722	if (pvWrong)
723	RTAssertDoPanic();
724	# endif
725
726	/*
727	* Fill the user part of the block.
728	*/
729	AssertMsg(enmType != RTMEMTYPE_RTMEMFREEZ \|\| cbUser == pBlock->cbUnaligned,
730	("cbUser=%#zx cbUnaligned=%#zx\n", cbUser, pBlock->cbUnaligned));
731	RT_NOREF(cbUser);
732	if (enmType == RTMEMTYPE_RTMEMFREEZ)
733	RT_BZERO(pv, pBlock->cbUnaligned);
734	# ifdef RTALLOC_EFENCE_FREE_FILL
735	else
736	memset(pv, RTALLOC_EFENCE_FREE_FILL, pBlock->cbUnaligned);
737	# endif
738
739	# if defined(RTALLOC_EFENCE_FREE_DELAYED) && RTALLOC_EFENCE_FREE_DELAYED > 0
740	/*
741	* We're doing delayed freeing.
742	* That means we'll expand the E-fence to cover the entire block.
743	*/
744	int rc = RTMemProtect(pv, pBlock->cbAligned, RTMEM_PROT_NONE);
745	if (RT_SUCCESS(rc))
746	{
747	/*
748	* Insert it into the free list and process pending frees.
749	*/
750	rtmemBlockDelayInsert(pBlock);
751	while ((pBlock = rtmemBlockDelayRemove()) != NULL)
752	{
753	pv = pBlock->Core.Key;
754	# ifdef RTALLOC_EFENCE_IN_FRONT
755	void pvBlock = (char )pv - RTALLOC_EFENCE_SIZE;
756	# else
757	void pvBlock = (void )((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
758	# endif
759	size_t cbBlock = RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
760	rc = RTMemProtect(pvBlock, cbBlock, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
761	if (RT_SUCCESS(rc))
762	RTMemPageFree(pvBlock, RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE);
763	else
764	rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ \| RTMEM_PROT_WRITE) -> %d\n", pvBlock, cbBlock, rc);
765	rtmemBlockFree(pBlock);
766	}
767	}
768	else
769	rtmemComplain(pszOp, "Failed to expand the efence of pv=%p cb=%d, rc=%d.\n", pv, pBlock, rc);
770
771	# else /* !RTALLOC_EFENCE_FREE_DELAYED */
772
773	/*
774	* Turn of the E-fence and free it.
775	*/
776	# ifdef RTALLOC_EFENCE_IN_FRONT
777	void pvBlock = (char )pv - RTALLOC_EFENCE_SIZE;
778	void *pvEFence = pvBlock;
779	# else
780	void pvBlock = (void )((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
781	void pvEFence = (char )pv + pBlock->cb;
782	# endif
783	int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
784	if (RT_SUCCESS(rc))
785	RTMemPageFree(pvBlock, RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE);
786	else
787	rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ \| RTMEM_PROT_WRITE) -> %d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc);
788	rtmemBlockFree(pBlock);
789
790	# endif /* !RTALLOC_EFENCE_FREE_DELAYED */
791	}
792	else
793	rtmemComplain(pszOp, "pv=%p not found! Incorrect free!\n", pv);
794
795	#else /* !RTALLOC_EFENCE_TRACE */
796
797	/*
798	* We have no size tracking, so we're not doing any freeing because
799	* we cannot if the E-fence is after the block.
800	* Let's just expand the E-fence to the first page of the user bit
801	* since we know that it's around.
802	*/
803	if (enmType == RTMEMTYPE_RTMEMFREEZ)
804	RT_BZERO(pv, cbUser);
805	int rc = RTMemProtect((void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK), PAGE_SIZE, RTMEM_PROT_NONE);
806	if (RT_FAILURE(rc))
807	rtmemComplain(pszOp, "RTMemProtect(%p, PAGE_SIZE, RTMEM_PROT_NONE) -> %d\n", (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK), rc);
808	#endif /* !RTALLOC_EFENCE_TRACE */
809	}
810
811
812	/**
813	* Internal realloc.
814	*/
815	RTDECL(void ) rtR3MemRealloc(const char pszOp, RTMEMTYPE enmType, void *pvOld, size_t cbNew,
816	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
817	{
818	/*
819	* Allocate new and copy.
820	*/
821	if (!pvOld)
822	return rtR3MemAlloc(pszOp, enmType, cbNew, cbNew, pszTag, pvCaller, RT_SRC_POS_ARGS);
823	if (!cbNew)
824	{
825	rtR3MemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, 0, pvCaller, RT_SRC_POS_ARGS);
826	return NULL;
827	}
828
829	#ifdef RTALLOC_EFENCE_TRACE
830
831	/*
832	* Get the block, allocate the new, copy the data, free the old one.
833	*/
834	PRTMEMBLOCK pBlock = rtmemBlockGet(pvOld);
835	if (pBlock)
836	{
837	void *pvRet = rtR3MemAlloc(pszOp, enmType, cbNew, cbNew, pszTag, pvCaller, RT_SRC_POS_ARGS);
838	if (pvRet)
839	{
840	memcpy(pvRet, pvOld, RT_MIN(cbNew, pBlock->cbUnaligned));
841	rtR3MemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, 0, pvCaller, RT_SRC_POS_ARGS);
842	}
843	return pvRet;
844	}
845	else
846	rtmemComplain(pszOp, "pvOld=%p was not found!\n", pvOld);
847	return NULL;
848
849	#else /* !RTALLOC_EFENCE_TRACE */
850
851	rtmemComplain(pszOp, "Not supported if RTALLOC_EFENCE_TRACE isn't defined!\n");
852	return NULL;
853
854	#endif /* !RTALLOC_EFENCE_TRACE */
855	}
856
857
858
859
860	RTDECL(void ) RTMemEfTmpAlloc(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
861	{
862	return rtR3MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
863	}
864
865
866	RTDECL(void ) RTMemEfTmpAllocZ(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
867	{
868	return rtR3MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
869	}
870
871
872	RTDECL(void) RTMemEfTmpFree(void *pv, RT_SRC_POS_DECL) RT_NO_THROW_DEF
873	{
874	if (pv)
875	rtR3MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), RT_SRC_POS_ARGS);
876	}
877
878
879	RTDECL(void) RTMemEfTmpFreeZ(void *pv, size_t cb, RT_SRC_POS_DECL) RT_NO_THROW_DEF
880	{
881	if (pv)
882	rtR3MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), RT_SRC_POS_ARGS);
883	}
884
885
886	RTDECL(void ) RTMemEfAlloc(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
887	{
888	return rtR3MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
889	}
890
891
892	RTDECL(void ) RTMemEfAllocZ(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
893	{
894	return rtR3MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
895	}
896
897
898	RTDECL(void ) RTMemEfAllocVar(size_t cbUnaligned, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
899	{
900	size_t cbAligned;
901	if (cbUnaligned >= 16)
902	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
903	else
904	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
905	return rtR3MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
906	}
907
908
909	RTDECL(void ) RTMemEfAllocZVar(size_t cbUnaligned, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
910	{
911	size_t cbAligned;
912	if (cbUnaligned >= 16)
913	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
914	else
915	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
916	return rtR3MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
917	}
918
919
920	RTDECL(void ) RTMemEfRealloc(void pvOld, size_t cbNew, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
921	{
922	return rtR3MemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
923	}
924
925
926	RTDECL(void ) RTMemEfReallocZ(void pvOld, size_t cbOld, size_t cbNew, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
927	{
928	void *pvDst = rtR3MemRealloc("ReallocZ", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
929	if (pvDst && cbNew > cbOld)
930	memset((uint8_t *)pvDst + cbOld, 0, cbNew - cbOld);
931	return pvDst;
932	}
933
934
935	RTDECL(void) RTMemEfFree(void *pv, RT_SRC_POS_DECL) RT_NO_THROW_DEF
936	{
937	if (pv)
938	rtR3MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), RT_SRC_POS_ARGS);
939	}
940
941
942	RTDECL(void) RTMemEfFreeZ(void *pv, size_t cb, RT_SRC_POS_DECL) RT_NO_THROW_DEF
943	{
944	if (pv)
945	rtR3MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), RT_SRC_POS_ARGS);
946	}
947
948
949	RTDECL(void ) RTMemEfDup(const void pvSrc, size_t cb, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
950	{
951	void *pvDst = RTMemEfAlloc(cb, pszTag, RT_SRC_POS_ARGS);
952	if (pvDst)
953	memcpy(pvDst, pvSrc, cb);
954	return pvDst;
955	}
956
957
958	RTDECL(void ) RTMemEfDupEx(const void pvSrc, size_t cbSrc, size_t cbExtra, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
959	{
960	void *pvDst = RTMemEfAlloc(cbSrc + cbExtra, pszTag, RT_SRC_POS_ARGS);
961	if (pvDst)
962	{
963	memcpy(pvDst, pvSrc, cbSrc);
964	memset((uint8_t *)pvDst + cbSrc, 0, cbExtra);
965	}
966	return pvDst;
967	}
968
969
970
971
972	/*
973	*
974	* The NP (no position) versions.
975	*
976	*/
977
978
979
980	RTDECL(void ) RTMemEfTmpAllocNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
981	{
982	return rtR3MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
983	}
984
985
986	RTDECL(void ) RTMemEfTmpAllocZNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
987	{
988	return rtR3MemAlloc("TmpAllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
989	}
990
991
992	RTDECL(void) RTMemEfTmpFreeNP(void *pv) RT_NO_THROW_DEF
993	{
994	if (pv)
995	rtR3MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), NULL, 0, NULL);
996	}
997
998
999	RTDECL(void) RTMemEfTmpFreeZNP(void *pv, size_t cb) RT_NO_THROW_DEF
1000	{
1001	if (pv)
1002	rtR3MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), NULL, 0, NULL);
1003	}
1004
1005
1006	RTDECL(void ) RTMemEfAllocNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
1007	{
1008	return rtR3MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1009	}
1010
1011
1012	RTDECL(void ) RTMemEfAllocZNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
1013	{
1014	return rtR3MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1015	}
1016
1017
1018	RTDECL(void ) RTMemEfAllocVarNP(size_t cbUnaligned, const char pszTag) RT_NO_THROW_DEF
1019	{
1020	size_t cbAligned;
1021	if (cbUnaligned >= 16)
1022	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
1023	else
1024	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
1025	return rtR3MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1026	}
1027
1028
1029	RTDECL(void ) RTMemEfAllocZVarNP(size_t cbUnaligned, const char pszTag) RT_NO_THROW_DEF
1030	{
1031	size_t cbAligned;
1032	if (cbUnaligned >= 16)
1033	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
1034	else
1035	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
1036	return rtR3MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1037	}
1038
1039
1040	RTDECL(void ) RTMemEfReallocNP(void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
1041	{
1042	return rtR3MemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1043	}
1044
1045
1046	RTDECL(void ) RTMemEfReallocZNP(void pvOld, size_t cbOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
1047	{
1048	void *pvDst = rtR3MemRealloc("ReallocZ", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), NULL, 0, NULL);
1049	if (pvDst && cbNew > cbOld)
1050	memset((uint8_t *)pvDst + cbOld, 0, cbNew - cbOld);
1051	return pvDst;
1052	}
1053
1054
1055	RTDECL(void) RTMemEfFreeNP(void *pv) RT_NO_THROW_DEF
1056	{
1057	if (pv)
1058	rtR3MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), NULL, 0, NULL);
1059	}
1060
1061
1062	RTDECL(void) RTMemEfFreeZNP(void *pv, size_t cb) RT_NO_THROW_DEF
1063	{
1064	if (pv)
1065	rtR3MemFree("Free", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), NULL, 0, NULL);
1066	}
1067
1068
1069	RTDECL(void ) RTMemEfDupNP(const void pvSrc, size_t cb, const char *pszTag) RT_NO_THROW_DEF
1070	{
1071	void *pvDst = RTMemEfAlloc(cb, pszTag, NULL, 0, NULL);
1072	if (pvDst)
1073	memcpy(pvDst, pvSrc, cb);
1074	return pvDst;
1075	}
1076
1077
1078	RTDECL(void ) RTMemEfDupExNP(const void pvSrc, size_t cbSrc, size_t cbExtra, const char *pszTag) RT_NO_THROW_DEF
1079	{
1080	void *pvDst = RTMemEfAlloc(cbSrc + cbExtra, pszTag, NULL, 0, NULL);
1081	if (pvDst)
1082	{
1083	memcpy(pvDst, pvSrc, cbSrc);
1084	memset((uint8_t *)pvDst + cbSrc, 0, cbExtra);
1085	}
1086	return pvDst;
1087	}
1088

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source: vbox/trunk/src/VBox/Runtime/r3/alloc-ef.cpp@ 99196

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