alloc-ef-r0drv.cpp@ 98103

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1	/* $Id: alloc-ef-r0drv.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocation, electric fence for ring-0 drivers.
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	#define RTMEM_NO_WRAP_TO_EF_APIS
42	#include "internal/iprt.h"
43	#include <iprt/mem.h>
44
45	#include <iprt/alloc.h>
46	#include <iprt/asm.h>
47	#include <iprt/asm-amd64-x86.h>
48	#include <iprt/assert.h>
49	#include <iprt/errcore.h>
50	#include <iprt/log.h>
51	#include <iprt/memobj.h>
52	#include <iprt/param.h>
53	#include <iprt/string.h>
54	#include <iprt/thread.h>
55
56	#include "internal/mem.h"
57
58
59	/*********************************************************************************************************************************
60	* Defined Constants And Macros *
61	*********************************************************************************************************************************/
62	#if defined(DOXYGEN_RUNNING)
63	# define RTR0MEM_EF_IN_FRONT
64	#endif
65
66	/** @def RTR0MEM_EF_SIZE
67	* The size of the fence. This must be page aligned.
68	*/
69	#define RTR0MEM_EF_SIZE PAGE_SIZE
70
71	/** @def RTR0MEM_EF_ALIGNMENT
72	* The allocation alignment, power of two of course.
73	*
74	* Use this for working around misaligned sizes, usually stemming from
75	* allocating a string or something after the main structure. When you
76	* encounter this, please fix the allocation to RTMemAllocVar or RTMemAllocZVar.
77	*/
78	#if 0
79	# define RTR0MEM_EF_ALIGNMENT (ARCH_BITS / 8)
80	#else
81	# define RTR0MEM_EF_ALIGNMENT 1
82	#endif
83
84	/** @def RTR0MEM_EF_IN_FRONT
85	* Define this to put the fence up in front of the block.
86	* The default (when this isn't defined) is to up it up after the block.
87	*/
88	//# define RTR0MEM_EF_IN_FRONT
89
90	/** @def RTR0MEM_EF_FREE_DELAYED
91	* This define will enable free() delay and protection of the freed data
92	* while it's being delayed. The value of RTR0MEM_EF_FREE_DELAYED defines
93	* the threshold of the delayed blocks.
94	* Delayed blocks does not consume any physical memory, only virtual address space.
95	*/
96	#define RTR0MEM_EF_FREE_DELAYED (20 * _1M)
97
98	/** @def RTR0MEM_EF_FREE_FILL
99	* This define will enable memset(,RTR0MEM_EF_FREE_FILL,)'ing the user memory
100	* in the block before freeing/decommitting it. This is useful in GDB since GDB
101	* appears to be able to read the content of the page even after it's been
102	* decommitted.
103	*/
104	#define RTR0MEM_EF_FREE_FILL 'f'
105
106	/** @def RTR0MEM_EF_FILLER
107	* This define will enable memset(,RTR0MEM_EF_FILLER,)'ing the allocated
108	* memory when the API doesn't require it to be zero'd.
109	*/
110	#define RTR0MEM_EF_FILLER 0xef
111
112	/** @def RTR0MEM_EF_NOMAN_FILLER
113	* This define will enable memset(,RTR0MEM_EF_NOMAN_FILLER,)'ing the
114	* unprotected but not allocated area of memory, the so called no man's land.
115	*/
116	#define RTR0MEM_EF_NOMAN_FILLER 0xaa
117
118	/** @def RTR0MEM_EF_FENCE_FILLER
119	* This define will enable memset(,RTR0MEM_EF_FENCE_FILLER,)'ing the
120	* fence itself, as debuggers can usually read them.
121	*/
122	#define RTR0MEM_EF_FENCE_FILLER 0xcc
123
124
125	/*********************************************************************************************************************************
126	* Header Files *
127	*********************************************************************************************************************************/
128	#ifdef RT_OS_WINDOWS
129	# include <iprt/win/windows.h>
130	#elif !defined(RT_OS_FREEBSD)
131	# include <sys/mman.h>
132	#endif
133	#include <iprt/avl.h>
134	#include <iprt/thread.h>
135
136
137	/*********************************************************************************************************************************
138	* Structures and Typedefs *
139	*********************************************************************************************************************************/
140	/**
141	* Allocation types.
142	*/
143	typedef enum RTMEMTYPE
144	{
145	RTMEMTYPE_RTMEMALLOC,
146	RTMEMTYPE_RTMEMALLOCZ,
147	RTMEMTYPE_RTMEMREALLOC,
148	RTMEMTYPE_RTMEMFREE,
149	RTMEMTYPE_RTMEMFREEZ,
150
151	RTMEMTYPE_NEW,
152	RTMEMTYPE_NEW_ARRAY,
153	RTMEMTYPE_DELETE,
154	RTMEMTYPE_DELETE_ARRAY
155	} RTMEMTYPE;
156
157	/**
158	* Node tracking a memory allocation.
159	*/
160	typedef struct RTR0MEMEFBLOCK
161	{
162	/** Avl node code, key is the user block pointer. */
163	AVLPVNODECORE Core;
164	/** Allocation type. */
165	RTMEMTYPE enmType;
166	/** The memory object. */
167	RTR0MEMOBJ hMemObj;
168	/** The unaligned size of the block. */
169	size_t cbUnaligned;
170	/** The aligned size of the block. */
171	size_t cbAligned;
172	/** The allocation tag (read-only string). */
173	const char *pszTag;
174	/** The return address of the allocator function. */
175	void *pvCaller;
176	/** Line number of the alloc call. */
177	unsigned iLine;
178	/** File from within the allocation was made. */
179	const char *pszFile;
180	/** Function from within the allocation was made. */
181	const char *pszFunction;
182	} RTR0MEMEFBLOCK, *PRTR0MEMEFBLOCK;
183
184
185
186	/*********************************************************************************************************************************
187	* Global Variables *
188	*********************************************************************************************************************************/
189	/** Spinlock protecting the all the block's globals. */
190	static volatile uint32_t g_BlocksLock;
191	/** Tree tracking the allocations. */
192	static AVLPVTREE g_BlocksTree;
193
194	#ifdef RTR0MEM_EF_FREE_DELAYED
195	/** Tail of the delayed blocks. */
196	static volatile PRTR0MEMEFBLOCK g_pBlocksDelayHead;
197	/** Tail of the delayed blocks. */
198	static volatile PRTR0MEMEFBLOCK g_pBlocksDelayTail;
199	/** Number of bytes in the delay list (includes fences). */
200	static volatile size_t g_cbBlocksDelay;
201	#endif /* RTR0MEM_EF_FREE_DELAYED */
202
203	/** Array of pointers free watches for. */
204	void *gapvRTMemFreeWatch[4] = {NULL, NULL, NULL, NULL};
205	/** Enable logging of all freed memory. */
206	bool gfRTMemFreeLog = false;
207
208
209	/*********************************************************************************************************************************
210	* Internal Functions *
211	*********************************************************************************************************************************/
212
213
214	/**
215	* @callback_method_impl{FNRTSTROUTPUT}
216	*/
217	static DECLCALLBACK(size_t) rtR0MemEfWrite(void pvArg, const char pachChars, size_t cbChars)
218	{
219	RT_NOREF1(pvArg);
220	if (cbChars)
221	{
222	RTLogWriteDebugger(pachChars, cbChars);
223	RTLogWriteStdOut(pachChars, cbChars);
224	RTLogWriteUser(pachChars, cbChars);
225	}
226	return cbChars;
227	}
228
229
230	/**
231	* Complains about something.
232	*/
233	static void rtR0MemComplain(const char pszOp, const char pszFormat, ...)
234	{
235	va_list args;
236	RTStrFormat(rtR0MemEfWrite, NULL, NULL, NULL, "RTMem error: %s: ", pszOp);
237	va_start(args, pszFormat);
238	RTStrFormatV(rtR0MemEfWrite, NULL, NULL, NULL, pszFormat, args);
239	va_end(args);
240	RTAssertDoPanic();
241	}
242
243	/**
244	* Log an event.
245	*/
246	DECLINLINE(void) rtR0MemLog(const char pszOp, const char pszFormat, ...)
247	{
248	#if 0
249	va_list args;
250	RTStrFormat(rtR0MemEfWrite, NULL, NULL, NULL, "RTMem info: %s: ", pszOp);
251	va_start(args, pszFormat);
252	RTStrFormatV(rtR0MemEfWrite, NULL, NULL, NULL, pszFormat, args);
253	va_end(args);
254	#else
255	NOREF(pszOp); NOREF(pszFormat);
256	#endif
257	}
258
259
260
261	/**
262	* Acquires the lock.
263	*/
264	DECLINLINE(RTCCUINTREG) rtR0MemBlockLock(void)
265	{
266	RTCCUINTREG uRet;
267	unsigned c = 0;
268	if (RTThreadPreemptIsEnabled(NIL_RTTHREAD))
269	{
270	for (;;)
271	{
272	uRet = ASMIntDisableFlags();
273	if (ASMAtomicCmpXchgU32(&g_BlocksLock, 1, 0))
274	break;
275	ASMSetFlags(uRet);
276	RTThreadSleepNoLog(((++c) >> 2) & 31);
277	}
278	}
279	else
280	{
281	for (;;)
282	{
283	uRet = ASMIntDisableFlags();
284	if (ASMAtomicCmpXchgU32(&g_BlocksLock, 1, 0))
285	break;
286	ASMSetFlags(uRet);
287	ASMNopPause();
288	if (++c & 3)
289	ASMNopPause();
290	}
291	}
292	return uRet;
293	}
294
295
296	/**
297	* Releases the lock.
298	*/
299	DECLINLINE(void) rtR0MemBlockUnlock(RTCCUINTREG fSavedIntFlags)
300	{
301	Assert(g_BlocksLock == 1);
302	ASMAtomicXchgU32(&g_BlocksLock, 0);
303	ASMSetFlags(fSavedIntFlags);
304	}
305
306
307	/**
308	* Creates a block.
309	*/
310	DECLINLINE(PRTR0MEMEFBLOCK) rtR0MemBlockCreate(RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
311	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
312	{
313	PRTR0MEMEFBLOCK pBlock = (PRTR0MEMEFBLOCK)RTMemAlloc(sizeof(*pBlock));
314	if (pBlock)
315	{
316	pBlock->enmType = enmType;
317	pBlock->cbUnaligned = cbUnaligned;
318	pBlock->cbAligned = cbAligned;
319	pBlock->pszTag = pszTag;
320	pBlock->pvCaller = pvCaller;
321	pBlock->iLine = iLine;
322	pBlock->pszFile = pszFile;
323	pBlock->pszFunction = pszFunction;
324	}
325	return pBlock;
326	}
327
328
329	/**
330	* Frees a block.
331	*/
332	DECLINLINE(void) rtR0MemBlockFree(PRTR0MEMEFBLOCK pBlock)
333	{
334	RTMemFree(pBlock);
335	}
336
337
338	/**
339	* Insert a block from the tree.
340	*/
341	DECLINLINE(void) rtR0MemBlockInsert(PRTR0MEMEFBLOCK pBlock, void *pv, RTR0MEMOBJ hMemObj)
342	{
343	pBlock->Core.Key = pv;
344	pBlock->hMemObj = hMemObj;
345	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
346	bool fRc = RTAvlPVInsert(&g_BlocksTree, &pBlock->Core);
347	rtR0MemBlockUnlock(fSavedIntFlags);
348	AssertRelease(fRc);
349	}
350
351
352	/**
353	* Remove a block from the tree and returns it to the caller.
354	*/
355	DECLINLINE(PRTR0MEMEFBLOCK) rtR0MemBlockRemove(void *pv)
356	{
357	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
358	PRTR0MEMEFBLOCK pBlock = (PRTR0MEMEFBLOCK)RTAvlPVRemove(&g_BlocksTree, pv);
359	rtR0MemBlockUnlock(fSavedIntFlags);
360	return pBlock;
361	}
362
363
364	/**
365	* Gets a block.
366	*/
367	DECLINLINE(PRTR0MEMEFBLOCK) rtR0MemBlockGet(void *pv)
368	{
369	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
370	PRTR0MEMEFBLOCK pBlock = (PRTR0MEMEFBLOCK)RTAvlPVGet(&g_BlocksTree, pv);
371	rtR0MemBlockUnlock(fSavedIntFlags);
372	return pBlock;
373	}
374
375
376	/**
377	* Dumps one allocation.
378	*/
379	static DECLCALLBACK(int) RTMemDumpOne(PAVLPVNODECORE pNode, void *pvUser)
380	{
381	PRTR0MEMEFBLOCK pBlock = (PRTR0MEMEFBLOCK)pNode;
382	RTStrFormat(rtR0MemEfWrite, NULL, NULL, NULL, "%p %08lx(+%02lx) %p\n",
383	pBlock->Core.Key,
384	(unsigned long)pBlock->cbUnaligned,
385	(unsigned long)(pBlock->cbAligned - pBlock->cbUnaligned),
386	pBlock->pvCaller);
387	NOREF(pvUser);
388	return 0;
389	}
390
391
392	/**
393	* Dumps the allocated blocks.
394	* This is something which you should call from gdb.
395	*/
396	RT_C_DECLS_BEGIN
397	void RTMemDump(void);
398	RT_C_DECLS_END
399
400	void RTMemDump(void)
401	{
402	RTStrFormat(rtR0MemEfWrite, NULL, NULL, NULL, "address size(alg) caller\n");
403	RTAvlPVDoWithAll(&g_BlocksTree, true, RTMemDumpOne, NULL);
404	}
405
406	#ifdef RTR0MEM_EF_FREE_DELAYED
407
408	/**
409	* Insert a delayed block.
410	*/
411	DECLINLINE(void) rtR0MemBlockDelayInsert(PRTR0MEMEFBLOCK pBlock)
412	{
413	size_t cbBlock = RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTR0MEM_EF_SIZE;
414	pBlock->Core.pRight = NULL;
415	pBlock->Core.pLeft = NULL;
416	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
417	if (g_pBlocksDelayHead)
418	{
419	g_pBlocksDelayHead->Core.pLeft = (PAVLPVNODECORE)pBlock;
420	pBlock->Core.pRight = (PAVLPVNODECORE)g_pBlocksDelayHead;
421	g_pBlocksDelayHead = pBlock;
422	}
423	else
424	{
425	g_pBlocksDelayTail = pBlock;
426	g_pBlocksDelayHead = pBlock;
427	}
428	g_cbBlocksDelay += cbBlock;
429	rtR0MemBlockUnlock(fSavedIntFlags);
430	}
431
432	/**
433	* Removes a delayed block.
434	*/
435	DECLINLINE(PRTR0MEMEFBLOCK) rtR0MemBlockDelayRemove(void)
436	{
437	PRTR0MEMEFBLOCK pBlock = NULL;
438	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
439	if (g_cbBlocksDelay > RTR0MEM_EF_FREE_DELAYED)
440	{
441	pBlock = g_pBlocksDelayTail;
442	if (pBlock)
443	{
444	g_pBlocksDelayTail = (PRTR0MEMEFBLOCK)pBlock->Core.pLeft;
445	if (pBlock->Core.pLeft)
446	pBlock->Core.pLeft->pRight = NULL;
447	else
448	g_pBlocksDelayHead = NULL;
449	g_cbBlocksDelay -= RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTR0MEM_EF_SIZE;
450	}
451	}
452	rtR0MemBlockUnlock(fSavedIntFlags);
453	return pBlock;
454	}
455
456	#endif /* RTR0MEM_EF_FREE_DELAYED */
457
458
459	static void rtR0MemFreeBlock(PRTR0MEMEFBLOCK pBlock, const char *pszOp)
460	{
461	void *pv = pBlock->Core.Key;
462	# ifdef RTR0MEM_EF_IN_FRONT
463	void pvBlock = (char )pv - RTR0MEM_EF_SIZE;
464	# else
465	void pvBlock = (void )((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
466	# endif
467	size_t cbBlock = RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTR0MEM_EF_SIZE;
468
469	int rc = RTR0MemObjProtect(pBlock->hMemObj, 0 /offSub/, RT_ALIGN_Z(cbBlock, PAGE_SIZE), RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
470	if (RT_FAILURE(rc))
471	rtR0MemComplain(pszOp, "RTR0MemObjProtect([%p], 0, %#x, RTMEM_PROT_READ \| RTMEM_PROT_WRITE) -> %Rrc\n",
472	pvBlock, cbBlock, rc);
473
474	rc = RTR0MemObjFree(pBlock->hMemObj, true /fFreeMappings/);
475	if (RT_FAILURE(rc))
476	rtR0MemComplain(pszOp, "RTR0MemObjFree([%p LB %#x]) -> %Rrc\n", pvBlock, cbBlock, rc);
477	pBlock->hMemObj = NIL_RTR0MEMOBJ;
478
479	rtR0MemBlockFree(pBlock);
480	}
481
482
483	/**
484	* Initialize call, we shouldn't fail here.
485	*/
486	void rtR0MemEfInit(void)
487	{
488
489	}
490
491	/**
492	* @callback_method_impl{AVLPVCALLBACK}
493	*/
494	static DECLCALLBACK(int) rtR0MemEfDestroyBlock(PAVLPVNODECORE pNode, void *pvUser)
495	{
496	PRTR0MEMEFBLOCK pBlock = (PRTR0MEMEFBLOCK)pNode;
497
498	/* Note! pszFile and pszFunction may be invalid at this point. */
499	rtR0MemComplain("rtR0MemEfDestroyBlock", "Leaking %zu bytes at %p (iLine=%u pvCaller=%p)\n",
500	pBlock->cbAligned, pBlock->Core.Key, pBlock->iLine, pBlock->pvCaller);
501
502	rtR0MemFreeBlock(pBlock, "rtR0MemEfDestroyBlock");
503
504	NOREF(pvUser);
505	return VINF_SUCCESS;
506	}
507
508
509	/**
510	* Termination call.
511	*
512	* Will check and free memory.
513	*/
514	void rtR0MemEfTerm(void)
515	{
516	#ifdef RTR0MEM_EF_FREE_DELAYED
517	/*
518	* Release delayed frees.
519	*/
520	RTCCUINTREG fSavedIntFlags = rtR0MemBlockLock();
521	for (;;)
522	{
523	PRTR0MEMEFBLOCK pBlock = g_pBlocksDelayTail;
524	if (pBlock)
525	{
526	g_pBlocksDelayTail = (PRTR0MEMEFBLOCK)pBlock->Core.pLeft;
527	if (pBlock->Core.pLeft)
528	pBlock->Core.pLeft->pRight = NULL;
529	else
530	g_pBlocksDelayHead = NULL;
531	rtR0MemBlockUnlock(fSavedIntFlags);
532
533	rtR0MemFreeBlock(pBlock, "rtR0MemEfTerm");
534
535	rtR0MemBlockLock();
536	}
537	else
538	break;
539	}
540	g_cbBlocksDelay = 0;
541	rtR0MemBlockUnlock(fSavedIntFlags);
542	#endif
543
544	/*
545	* Complain about leaks. Then release them.
546	*/
547	RTAvlPVDestroy(&g_BlocksTree, rtR0MemEfDestroyBlock, NULL);
548	}
549
550
551	/**
552	* Internal allocator.
553	*/
554	static void * rtR0MemAlloc(const char *pszOp, RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
555	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
556	{
557	/*
558	* Sanity.
559	*/
560	if ( RT_ALIGN_Z(RTR0MEM_EF_SIZE, PAGE_SIZE) != RTR0MEM_EF_SIZE
561	&& RTR0MEM_EF_SIZE <= 0)
562	{
563	rtR0MemComplain(pszOp, "Invalid E-fence size! %#x\n", RTR0MEM_EF_SIZE);
564	return NULL;
565	}
566	if (!cbUnaligned)
567	{
568	#if 1
569	rtR0MemComplain(pszOp, "Request of ZERO bytes allocation!\n");
570	return NULL;
571	#else
572	cbAligned = cbUnaligned = 1;
573	#endif
574	}
575
576	#ifndef RTR0MEM_EF_IN_FRONT
577	/* Alignment decreases fence accuracy, but this is at least partially
578	* counteracted by filling and checking the alignment padding. When the
579	* fence is in front then then no extra alignment is needed. */
580	cbAligned = RT_ALIGN_Z(cbAligned, RTR0MEM_EF_ALIGNMENT);
581	#endif
582
583	/*
584	* Allocate the trace block.
585	*/
586	PRTR0MEMEFBLOCK pBlock = rtR0MemBlockCreate(enmType, cbUnaligned, cbAligned, pszTag, pvCaller, RT_SRC_POS_ARGS);
587	if (!pBlock)
588	{
589	rtR0MemComplain(pszOp, "Failed to allocate trace block!\n");
590	return NULL;
591	}
592
593	/*
594	* Allocate a block with page alignment space + the size of the E-fence.
595	*/
596	void *pvBlock = NULL;
597	RTR0MEMOBJ hMemObj;
598	size_t cbBlock = RT_ALIGN_Z(cbAligned, PAGE_SIZE) + RTR0MEM_EF_SIZE;
599	int rc = RTR0MemObjAllocPage(&hMemObj, cbBlock, false /fExecutable/);
600	if (RT_SUCCESS(rc))
601	pvBlock = RTR0MemObjAddress(hMemObj);
602	if (pvBlock)
603	{
604	/*
605	* Calc the start of the fence and the user block
606	* and then change the page protection of the fence.
607	*/
608	#ifdef RTR0MEM_EF_IN_FRONT
609	void *pvEFence = pvBlock;
610	void pv = (char )pvEFence + RTR0MEM_EF_SIZE;
611	# ifdef RTR0MEM_EF_NOMAN_FILLER
612	memset((char *)pv + cbUnaligned, RTR0MEM_EF_NOMAN_FILLER, cbBlock - RTR0MEM_EF_SIZE - cbUnaligned);
613	# endif
614	#else
615	void pvEFence = (char )pvBlock + (cbBlock - RTR0MEM_EF_SIZE);
616	void pv = (char )pvEFence - cbAligned;
617	# ifdef RTR0MEM_EF_NOMAN_FILLER
618	memset(pvBlock, RTR0MEM_EF_NOMAN_FILLER, cbBlock - RTR0MEM_EF_SIZE - cbAligned);
619	memset((char *)pv + cbUnaligned, RTR0MEM_EF_NOMAN_FILLER, cbAligned - cbUnaligned);
620	# endif
621	#endif
622
623	#ifdef RTR0MEM_EF_FENCE_FILLER
624	memset(pvEFence, RTR0MEM_EF_FENCE_FILLER, RTR0MEM_EF_SIZE);
625	#endif
626	rc = RTR0MemObjProtect(hMemObj, (uint8_t )pvEFence - (uint8_t )pvBlock, RTR0MEM_EF_SIZE, RTMEM_PROT_NONE);
627	if (!rc)
628	{
629	rtR0MemBlockInsert(pBlock, pv, hMemObj);
630	if (enmType == RTMEMTYPE_RTMEMALLOCZ)
631	memset(pv, 0, cbUnaligned);
632	#ifdef RTR0MEM_EF_FILLER
633	else
634	memset(pv, RTR0MEM_EF_FILLER, cbUnaligned);
635	#endif
636
637	rtR0MemLog(pszOp, "returns %p (pvBlock=%p cbBlock=%#x pvEFence=%p cbUnaligned=%#x)\n", pv, pvBlock, cbBlock, pvEFence, cbUnaligned);
638	return pv;
639	}
640	rtR0MemComplain(pszOp, "RTMemProtect failed, pvEFence=%p size %d, rc=%d\n", pvEFence, RTR0MEM_EF_SIZE, rc);
641	RTR0MemObjFree(hMemObj, true /fFreeMappings/);
642	}
643	else
644	{
645	rtR0MemComplain(pszOp, "Failed to allocated %zu (%zu) bytes (rc=%Rrc).\n", cbBlock, cbUnaligned, rc);
646	if (RT_SUCCESS(rc))
647	RTR0MemObjFree(hMemObj, true /fFreeMappings/);
648	}
649
650	rtR0MemBlockFree(pBlock);
651	return NULL;
652	}
653
654
655	/**
656	* Internal free.
657	*/
658	static void rtR0MemFree(const char pszOp, RTMEMTYPE enmType, void pv, size_t cbUser, void *pvCaller, RT_SRC_POS_DECL)
659	{
660	NOREF(enmType); RT_SRC_POS_NOREF();
661
662	/*
663	* Simple case.
664	*/
665	if (!pv)
666	return;
667
668	/*
669	* Check watch points.
670	*/
671	for (unsigned i = 0; i < RT_ELEMENTS(gapvRTMemFreeWatch); i++)
672	if (gapvRTMemFreeWatch[i] == pv)
673	RTAssertDoPanic();
674
675	/*
676	* Find the block.
677	*/
678	PRTR0MEMEFBLOCK pBlock = rtR0MemBlockRemove(pv);
679	if (pBlock)
680	{
681	if (gfRTMemFreeLog)
682	RTLogPrintf("RTMem %s: pv=%p pvCaller=%p cbUnaligned=%#x\n", pszOp, pv, pvCaller, pBlock->cbUnaligned);
683
684	#ifdef RTR0MEM_EF_NOMAN_FILLER
685	/*
686	* Check whether the no man's land is untouched.
687	*/
688	# ifdef RTR0MEM_EF_IN_FRONT
689	void pvWrong = ASMMemFirstMismatchingU8((char )pv + pBlock->cbUnaligned,
690	RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbUnaligned,
691	RTR0MEM_EF_NOMAN_FILLER);
692	# else
693	/* Alignment must match allocation alignment in rtMemAlloc(). */
694	void pvWrong = ASMMemFirstMismatchingU8((char )pv + pBlock->cbUnaligned,
695	pBlock->cbAligned - pBlock->cbUnaligned,
696	RTR0MEM_EF_NOMAN_FILLER);
697	if (pvWrong)
698	RTAssertDoPanic();
699	pvWrong = ASMMemFirstMismatchingU8((void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK),
700	RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbAligned,
701	RTR0MEM_EF_NOMAN_FILLER);
702	# endif
703	if (pvWrong)
704	RTAssertDoPanic();
705	#endif
706
707	/*
708	* Fill the user part of the block.
709	*/
710	AssertMsg(enmType != RTMEMTYPE_RTMEMFREEZ \|\| cbUser == pBlock->cbUnaligned,
711	("cbUser=%#zx cbUnaligned=%#zx\n", cbUser, pBlock->cbUnaligned));
712	RT_NOREF(cbUser);
713	if (enmType == RTMEMTYPE_RTMEMFREEZ)
714	RT_BZERO(pv, pBlock->cbUnaligned);
715	#ifdef RTR0MEM_EF_FREE_FILL
716	else
717	memset(pv, RTR0MEM_EF_FREE_FILL, pBlock->cbUnaligned);
718	#endif
719
720	#if defined(RTR0MEM_EF_FREE_DELAYED) && RTR0MEM_EF_FREE_DELAYED > 0
721	/*
722	* We're doing delayed freeing.
723	* That means we'll expand the E-fence to cover the entire block.
724	*/
725	int rc = RTR0MemObjProtect(pBlock->hMemObj,
726	# ifdef RTR0MEM_EF_IN_FRONT
727	RTR0MEM_EF_SIZE,
728	# else
729	0 /offSub/,
730	# endif
731	RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE),
732	RTMEM_PROT_NONE);
733	if (RT_SUCCESS(rc))
734	{
735	/*
736	* Insert it into the free list and process pending frees.
737	*/
738	rtR0MemBlockDelayInsert(pBlock);
739	while ((pBlock = rtR0MemBlockDelayRemove()) != NULL)
740	rtR0MemFreeBlock(pBlock, pszOp);
741	}
742	else
743	rtR0MemComplain(pszOp, "Failed to expand the efence of pv=%p cb=%d, rc=%d.\n", pv, pBlock, rc);
744
745	#else /* !RTR0MEM_EF_FREE_DELAYED */
746	rtR0MemFreeBlock(pBlock, pszOp);
747	#endif /* !RTR0MEM_EF_FREE_DELAYED */
748	}
749	else
750	rtR0MemComplain(pszOp, "pv=%p not found! Incorrect free!\n", pv);
751	}
752
753
754	/**
755	* Internal realloc.
756	*/
757	static void rtR0MemRealloc(const char pszOp, RTMEMTYPE enmType, void *pvOld, size_t cbNew,
758	const char pszTag, void pvCaller, RT_SRC_POS_DECL)
759	{
760	/*
761	* Allocate new and copy.
762	*/
763	if (!pvOld)
764	return rtR0MemAlloc(pszOp, enmType, cbNew, cbNew, pszTag, pvCaller, RT_SRC_POS_ARGS);
765	if (!cbNew)
766	{
767	rtR0MemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, 0, pvCaller, RT_SRC_POS_ARGS);
768	return NULL;
769	}
770
771	/*
772	* Get the block, allocate the new, copy the data, free the old one.
773	*/
774	PRTR0MEMEFBLOCK pBlock = rtR0MemBlockGet(pvOld);
775	if (pBlock)
776	{
777	void *pvRet = rtR0MemAlloc(pszOp, enmType, cbNew, cbNew, pszTag, pvCaller, RT_SRC_POS_ARGS);
778	if (pvRet)
779	{
780	memcpy(pvRet, pvOld, RT_MIN(cbNew, pBlock->cbUnaligned));
781	rtR0MemFree(pszOp, RTMEMTYPE_RTMEMREALLOC, pvOld, 0, pvCaller, RT_SRC_POS_ARGS);
782	}
783	return pvRet;
784	}
785	rtR0MemComplain(pszOp, "pvOld=%p was not found!\n", pvOld);
786	return NULL;
787	}
788
789
790
791
792	RTDECL(void ) RTMemEfTmpAlloc(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
793	{
794	return rtR0MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
795	}
796
797
798	RTDECL(void ) RTMemEfTmpAllocZ(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
799	{
800	return rtR0MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
801	}
802
803
804	RTDECL(void) RTMemEfTmpFree(void *pv, RT_SRC_POS_DECL) RT_NO_THROW_DEF
805	{
806	if (pv)
807	rtR0MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), RT_SRC_POS_ARGS);
808	}
809
810
811	RTDECL(void) RTMemEfTmpFreeZ(void *pv, size_t cb, RT_SRC_POS_DECL) RT_NO_THROW_DEF
812	{
813	if (pv)
814	rtR0MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), RT_SRC_POS_ARGS);
815	}
816
817
818	RTDECL(void ) RTMemEfAlloc(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
819	{
820	return rtR0MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
821	}
822
823
824	RTDECL(void ) RTMemEfAllocZ(size_t cb, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
825	{
826	return rtR0MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
827	}
828
829
830	RTDECL(void ) RTMemEfAllocVar(size_t cbUnaligned, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
831	{
832	size_t cbAligned;
833	if (cbUnaligned >= 16)
834	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
835	else
836	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
837	return rtR0MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
838	}
839
840
841	RTDECL(void ) RTMemEfAllocZVar(size_t cbUnaligned, const char pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
842	{
843	size_t cbAligned;
844	if (cbUnaligned >= 16)
845	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
846	else
847	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
848	return rtR0MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
849	}
850
851
852	RTDECL(void ) RTMemEfRealloc(void pvOld, size_t cbNew, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
853	{
854	return rtR0MemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
855	}
856
857	RTDECL(void ) RTMemEfReallocZ(void pvOld, size_t cbOld, size_t cbNew, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
858	{
859	void *pvDst = rtR0MemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), RT_SRC_POS_ARGS);
860	if (pvDst && cbNew > cbOld)
861	memset((uint8_t *)pvDst + cbOld, 0, cbNew - cbOld);
862	return pvDst;
863	}
864
865
866	RTDECL(void) RTMemEfFree(void *pv, RT_SRC_POS_DECL) RT_NO_THROW_DEF
867	{
868	if (pv)
869	rtR0MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), RT_SRC_POS_ARGS);
870	}
871
872
873	RTDECL(void) RTMemEfFreeZ(void *pv, size_t cb, RT_SRC_POS_DECL) RT_NO_THROW_DEF
874	{
875	if (pv)
876	rtR0MemFree("Free", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), RT_SRC_POS_ARGS);
877	}
878
879
880	RTDECL(void ) RTMemEfDup(const void pvSrc, size_t cb, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
881	{
882	void *pvDst = RTMemEfAlloc(cb, pszTag, RT_SRC_POS_ARGS);
883	if (pvDst)
884	memcpy(pvDst, pvSrc, cb);
885	return pvDst;
886	}
887
888
889	RTDECL(void ) RTMemEfDupEx(const void pvSrc, size_t cbSrc, size_t cbExtra, const char *pszTag, RT_SRC_POS_DECL) RT_NO_THROW_DEF
890	{
891	void *pvDst = RTMemEfAlloc(cbSrc + cbExtra, pszTag, RT_SRC_POS_ARGS);
892	if (pvDst)
893	{
894	memcpy(pvDst, pvSrc, cbSrc);
895	memset((uint8_t *)pvDst + cbSrc, 0, cbExtra);
896	}
897	return pvDst;
898	}
899
900
901
902
903	/*
904	*
905	* The NP (no position) versions.
906	*
907	*/
908
909
910
911	RTDECL(void ) RTMemEfTmpAllocNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
912	{
913	return rtR0MemAlloc("TmpAlloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
914	}
915
916
917	RTDECL(void ) RTMemEfTmpAllocZNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
918	{
919	return rtR0MemAlloc("TmpAllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
920	}
921
922
923	RTDECL(void) RTMemEfTmpFreeNP(void *pv) RT_NO_THROW_DEF
924	{
925	if (pv)
926	rtR0MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), NULL, 0, NULL);
927	}
928
929
930	RTDECL(void) RTMemEfTmpFreeZNP(void *pv, size_t cb) RT_NO_THROW_DEF
931	{
932	if (pv)
933	rtR0MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), NULL, 0, NULL);
934	}
935
936
937	RTDECL(void ) RTMemEfAllocNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
938	{
939	return rtR0MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
940	}
941
942
943	RTDECL(void ) RTMemEfAllocZNP(size_t cb, const char pszTag) RT_NO_THROW_DEF
944	{
945	return rtR0MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cb, cb, pszTag, ASMReturnAddress(), NULL, 0, NULL);
946	}
947
948
949	RTDECL(void ) RTMemEfAllocVarNP(size_t cbUnaligned, const char pszTag) RT_NO_THROW_DEF
950	{
951	size_t cbAligned;
952	if (cbUnaligned >= 16)
953	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
954	else
955	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
956	return rtR0MemAlloc("Alloc", RTMEMTYPE_RTMEMALLOC, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), NULL, 0, NULL);
957	}
958
959
960	RTDECL(void ) RTMemEfAllocZVarNP(size_t cbUnaligned, const char pszTag) RT_NO_THROW_DEF
961	{
962	size_t cbAligned;
963	if (cbUnaligned >= 16)
964	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
965	else
966	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
967	return rtR0MemAlloc("AllocZ", RTMEMTYPE_RTMEMALLOCZ, cbUnaligned, cbAligned, pszTag, ASMReturnAddress(), NULL, 0, NULL);
968	}
969
970
971	RTDECL(void ) RTMemEfReallocNP(void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
972	{
973	return rtR0MemRealloc("Realloc", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), NULL, 0, NULL);
974	}
975
976
977	RTDECL(void ) RTMemEfReallocZNP(void pvOld, size_t cbOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
978	{
979	void *pvDst = rtR0MemRealloc("ReallocZ", RTMEMTYPE_RTMEMREALLOC, pvOld, cbNew, pszTag, ASMReturnAddress(), NULL, 0, NULL);
980	if (pvDst && cbNew > cbOld)
981	memset((uint8_t *)pvDst + cbOld, 0, cbNew - cbOld);
982	return pvDst;
983	}
984
985
986	RTDECL(void) RTMemEfFreeNP(void *pv) RT_NO_THROW_DEF
987	{
988	if (pv)
989	rtR0MemFree("Free", RTMEMTYPE_RTMEMFREE, pv, 0, ASMReturnAddress(), NULL, 0, NULL);
990	}
991
992
993	RTDECL(void) RTMemEfFreeZNP(void *pv, size_t cb) RT_NO_THROW_DEF
994	{
995	if (pv)
996	rtR0MemFree("FreeZ", RTMEMTYPE_RTMEMFREEZ, pv, cb, ASMReturnAddress(), NULL, 0, NULL);
997	}
998
999
1000	RTDECL(void ) RTMemEfDupNP(const void pvSrc, size_t cb, const char *pszTag) RT_NO_THROW_DEF
1001	{
1002	void *pvDst = RTMemEfAlloc(cb, pszTag, NULL, 0, NULL);
1003	if (pvDst)
1004	memcpy(pvDst, pvSrc, cb);
1005	return pvDst;
1006	}
1007
1008
1009	RTDECL(void ) RTMemEfDupExNP(const void pvSrc, size_t cbSrc, size_t cbExtra, const char *pszTag) RT_NO_THROW_DEF
1010	{
1011	void *pvDst = RTMemEfAlloc(cbSrc + cbExtra, pszTag, NULL, 0, NULL);
1012	if (pvDst)
1013	{
1014	memcpy(pvDst, pvSrc, cbSrc);
1015	memset((uint8_t *)pvDst + cbSrc, 0, cbExtra);
1016	}
1017	return pvDst;
1018	}
1019

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source: vbox/trunk/src/VBox/Runtime/r0drv/alloc-ef-r0drv.cpp@ 98103

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