memsafer-r3.cpp@ 62534

Last change on this file since 62534 was 62477, checked in by vboxsync, 8 years ago
(C) 2016
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1	/* $Id: memsafer-r3.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocate for Sensitive Data, generic heap-based implementation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "internal/iprt.h"
32	#include <iprt/memsafer.h>
33
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/avl.h>
37	#include <iprt/critsect.h>
38	#include <iprt/mem.h>
39	#include <iprt/once.h>
40	#include <iprt/rand.h>
41	#include <iprt/param.h>
42	#include <iprt/string.h>
43	#ifdef IN_SUP_R3
44	# include <VBox/sup.h>
45	#endif
46
47
48	/*********************************************************************************************************************************
49	* Defined Constants And Macros *
50	*********************************************************************************************************************************/
51	/** Allocation size alignment (power of two). */
52	#define RTMEMSAFER_ALIGN 16
53
54
55	/*********************************************************************************************************************************
56	* Structures and Typedefs *
57	*********************************************************************************************************************************/
58	/**
59	* Allocators.
60	*/
61	typedef enum RTMEMSAFERALLOCATOR
62	{
63	/** Invalid method. */
64	RTMEMSAFERALLOCATOR_INVALID = 0,
65	/** RTMemPageAlloc. */
66	RTMEMSAFERALLOCATOR_RTMEMPAGE,
67	/** SUPR3PageAllocEx. */
68	RTMEMSAFERALLOCATOR_SUPR3
69	} RTMEMSAFERALLOCATOR;
70
71	/**
72	* Tracking node (lives on normal heap).
73	*/
74	typedef struct RTMEMSAFERNODE
75	{
76	/** Node core.
77	* The core key is a scrambled pointer the user memory. */
78	AVLPVNODECORE Core;
79	/** The allocation flags. */
80	uint32_t fFlags;
81	/** The offset into the allocation of the user memory. */
82	uint32_t offUser;
83	/** The requested allocation size. */
84	size_t cbUser;
85	/** The allocation size in pages, this includes the two guard pages. */
86	uint32_t cPages;
87	/** The allocator used for this node. */
88	RTMEMSAFERALLOCATOR enmAllocator;
89	} RTMEMSAFERNODE;
90	/** Pointer to an allocation tracking node. */
91	typedef RTMEMSAFERNODE *PRTMEMSAFERNODE;
92
93
94	/*********************************************************************************************************************************
95	* Global Variables *
96	*********************************************************************************************************************************/
97	/** Init once structure for this module. */
98	static RTONCE g_MemSaferOnce = RTONCE_INITIALIZER;
99	/** Critical section protecting the allocation tree. */
100	static RTCRITSECTRW g_MemSaferCritSect;
101	/** Tree of allocation nodes. */
102	static AVLPVTREE g_pMemSaferTree;
103	/** XOR scrambler value for memory. */
104	static uintptr_t g_uMemSaferScramblerXor;
105	/** XOR scrambler value pointers. */
106	static uintptr_t g_uMemSaferPtrScramblerXor;
107	/** Pointer rotate shift count.*/
108	static uintptr_t g_cMemSaferPtrScramblerRotate;
109
110
111	/**
112	* @callback_method_impl{FNRTONCE, Inits globals.}
113	*/
114	static DECLCALLBACK(int32_t) rtMemSaferOnceInit(void *pvUserIgnore)
115	{
116	g_uMemSaferScramblerXor = (uintptr_t)RTRandU64();
117	g_uMemSaferPtrScramblerXor = (uintptr_t)RTRandU64();
118	g_cMemSaferPtrScramblerRotate = RTRandU32Ex(0, ARCH_BITS - 1);
119	return RTCritSectRwInit(&g_MemSaferCritSect);
120	}
121
122
123	/**
124	* @callback_method_impl{PFNRTONCECLEANUP, Cleans up globals.}
125	*/
126	static DECLCALLBACK(void) rtMemSaferOnceTerm(void *pvUser, bool fLazyCleanUpOk)
127	{
128	if (!fLazyCleanUpOk)
129	{
130	RTCritSectRwDelete(&g_MemSaferCritSect);
131	Assert(!g_pMemSaferTree);
132	}
133	}
134
135
136
137	DECLINLINE(void ) rtMemSaferScramblePointer(void pvUser)
138	{
139	uintptr_t uPtr = (uintptr_t)pvUser;
140	uPtr ^= g_uMemSaferPtrScramblerXor;
141	#if ARCH_BITS == 64
142	uPtr = ASMRotateRightU64(uPtr, g_cMemSaferPtrScramblerRotate);
143	#elif ARCH_BITS == 32
144	uPtr = ASMRotateRightU32(uPtr, g_cMemSaferPtrScramblerRotate);
145	#else
146	# error "Unsupported/missing ARCH_BITS."
147	#endif
148	return (void *)uPtr;
149	}
150
151
152	/**
153	* Inserts a tracking node into the tree.
154	*
155	* @param pThis The allocation tracking node to insert.
156	*/
157	static void rtMemSaferNodeInsert(PRTMEMSAFERNODE pThis)
158	{
159	RTCritSectRwEnterExcl(&g_MemSaferCritSect);
160	pThis->Core.Key = rtMemSaferScramblePointer(pThis->Core.Key);
161	bool fRc = RTAvlPVInsert(&g_pMemSaferTree, &pThis->Core);
162	RTCritSectRwLeaveExcl(&g_MemSaferCritSect);
163	Assert(fRc); NOREF(fRc);
164	}
165
166
167	/**
168	* Finds a tracking node into the tree.
169	*
170	* @returns The allocation tracking node for @a pvUser. NULL if not found.
171	* @param pvUser The user pointer to the allocation.
172	*/
173	static PRTMEMSAFERNODE rtMemSaferNodeLookup(void *pvUser)
174	{
175	void *pvKey = rtMemSaferScramblePointer(pvUser);
176	RTCritSectRwEnterShared(&g_MemSaferCritSect);
177	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTAvlPVGet(&g_pMemSaferTree, pvKey);
178	RTCritSectRwLeaveShared(&g_MemSaferCritSect);
179	return pThis;
180	}
181
182
183	/**
184	* Removes a tracking node from the tree.
185	*
186	* @returns The allocation tracking node for @a pvUser. NULL if not found.
187	* @param pvUser The user pointer to the allocation.
188	*/
189	static PRTMEMSAFERNODE rtMemSaferNodeRemove(void *pvUser)
190	{
191	void *pvKey = rtMemSaferScramblePointer(pvUser);
192	RTCritSectRwEnterExcl(&g_MemSaferCritSect);
193	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTAvlPVRemove(&g_pMemSaferTree, pvKey);
194	RTCritSectRwLeaveExcl(&g_MemSaferCritSect);
195	return pThis;
196	}
197
198
199	RTDECL(int) RTMemSaferScramble(void *pv, size_t cb)
200	{
201	#ifdef RT_STRICT
202	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pv);
203	AssertReturn(pThis, VERR_INVALID_POINTER);
204	AssertMsgReturn(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser), VERR_INVALID_PARAMETER);
205	#endif
206
207	/* Note! This isn't supposed to be safe, just less obvious. */
208	uintptr_t pu = (uintptr_t )pv;
209	cb = RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN);
210	while (cb > 0)
211	{
212	*pu ^= g_uMemSaferScramblerXor;
213	pu++;
214	cb -= sizeof(*pu);
215	}
216
217	return VINF_SUCCESS;
218	}
219	RT_EXPORT_SYMBOL(RTMemSaferScramble);
220
221
222	RTDECL(int) RTMemSaferUnscramble(void *pv, size_t cb)
223	{
224	#ifdef RT_STRICT
225	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pv);
226	AssertReturn(pThis, VERR_INVALID_POINTER);
227	AssertMsgReturn(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser), VERR_INVALID_PARAMETER);
228	#endif
229
230	/* Note! This isn't supposed to be safe, just less obvious. */
231	uintptr_t pu = (uintptr_t )pv;
232	cb = RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN);
233	while (cb > 0)
234	{
235	*pu ^= g_uMemSaferScramblerXor;
236	pu++;
237	cb -= sizeof(*pu);
238	}
239
240	return VINF_SUCCESS;
241	}
242	RT_EXPORT_SYMBOL(RTMemSaferUnscramble);
243
244
245	/**
246	* Initializes the pages.
247	*
248	* Fills the memory with random bytes in order to make it less obvious where the
249	* secret data starts and ends. We also zero the user memory in case the
250	* allocator does not do this.
251	*
252	* @param pThis The allocation tracer node. The Core.Key member
253	* will be set.
254	* @param pvPages The pages to initialize.
255	*/
256	static void rtMemSaferInitializePages(PRTMEMSAFERNODE pThis, void *pvPages)
257	{
258	RTRandBytes(pvPages, PAGE_SIZE + pThis->offUser);
259
260	uint8_t pbUser = (uint8_t )pvPages + PAGE_SIZE + pThis->offUser;
261	pThis->Core.Key = pbUser;
262	RT_BZERO(pbUser, pThis->cbUser); /* paranoia */
263
264	RTRandBytes(pbUser + pThis->cbUser, (size_t)pThis->cPages * PAGE_SIZE - PAGE_SIZE - pThis->offUser - pThis->cbUser);
265	}
266
267
268	/**
269	* Allocates and initializes pages from the support driver and initializes it.
270	*
271	* @returns VBox status code.
272	* @param pThis The allocator node. Core.Key will be set on successful
273	* return (unscrambled).
274	*/
275	static int rtMemSaferSupR3AllocPages(PRTMEMSAFERNODE pThis)
276	{
277	#ifdef IN_SUP_R3
278	/*
279	* Try allocate the memory.
280	*/
281	void *pvPages;
282	int rc = SUPR3PageAllocEx(pThis->cPages, 0 /* fFlags /, &pvPages, NULL / pR0Ptr /, NULL / paPages */);
283	if (RT_SUCCESS(rc))
284	{
285	rtMemSaferInitializePages(pThis, pvPages);
286
287	/*
288	* On darwin we cannot allocate pages without an R0 mapping and
289	* SUPR3PageAllocEx falls back to another method which is incompatible with
290	* the way SUPR3PageProtect works. Ignore changing the protection of the guard
291	* pages.
292	*/
293	#ifdef RT_OS_DARWIN
294	return VINF_SUCCESS;
295	#else
296	/*
297	* Configure the guard pages.
298	* SUPR3PageProtect isn't supported on all hosts, we ignore that.
299	*/
300	rc = SUPR3PageProtect(pvPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_NONE);
301	if (RT_SUCCESS(rc))
302	{
303	rc = SUPR3PageProtect(pvPages, NIL_RTR0PTR, (pThis->cPages - 1) * PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_NONE);
304	if (RT_SUCCESS(rc))
305	return VINF_SUCCESS;
306	SUPR3PageProtect(pvPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
307	}
308	else if (rc == VERR_NOT_SUPPORTED)
309	return VINF_SUCCESS;
310
311	/* failed. */
312	int rc2 = SUPR3PageFreeEx(pvPages, pThis->cPages); AssertRC(rc2);
313	#endif
314	}
315	return rc;
316	#else /* !IN_SUP_R3 */
317	return VERR_NOT_SUPPORTED;
318	#endif /* !IN_SUP_R3 */
319	}
320
321
322	/**
323	* Allocates and initializes pages using the IPRT page allocator API.
324	*
325	* @returns VBox status code.
326	* @param pThis The allocator node. Core.Key will be set on successful
327	* return (unscrambled).
328	*/
329	static int rtMemSaferMemAllocPages(PRTMEMSAFERNODE pThis)
330	{
331	/*
332	* Try allocate the memory.
333	*/
334	int rc = VINF_SUCCESS;
335	void pvPages = RTMemPageAlloc((size_t)pThis->cPages PAGE_SIZE);
336	if (pvPages)
337	{
338	rtMemSaferInitializePages(pThis, pvPages);
339
340	/*
341	* Configure the guard pages.
342	*/
343	rc = RTMemProtect(pvPages, PAGE_SIZE, RTMEM_PROT_NONE);
344	if (RT_SUCCESS(rc))
345	{
346	rc = RTMemProtect((uint8_t )pvPages + (size_t)(pThis->cPages - 1U) PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_NONE);
347	if (RT_SUCCESS(rc))
348	return VINF_SUCCESS;
349	rc = RTMemProtect(pvPages, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
350	}
351
352	/* failed. */
353	RTMemPageFree(pvPages, (size_t)pThis->cPages * PAGE_SIZE);
354	}
355	else
356	rc = VERR_NO_PAGE_MEMORY;
357
358	return rc;
359	}
360
361
362	RTDECL(int) RTMemSaferAllocZExTag(void *ppvNew, size_t cb, uint32_t fFlags, const char pszTag) RT_NO_THROW_DEF
363	{
364	/*
365	* Validate input.
366	*/
367	AssertPtrReturn(ppvNew, VERR_INVALID_PARAMETER);
368	*ppvNew = NULL;
369	AssertReturn(cb, VERR_INVALID_PARAMETER);
370	AssertReturn(cb <= 32U_1M - PAGE_SIZE 3U, VERR_ALLOCATION_TOO_BIG); /* Max 32 MB minus padding and guard pages. */
371	AssertReturn(!(fFlags & ~RTMEMSAFER_F_VALID_MASK), VERR_INVALID_FLAGS);
372
373	/*
374	* Initialize globals.
375	*/
376	int rc = RTOnceEx(&g_MemSaferOnce, rtMemSaferOnceInit, rtMemSaferOnceTerm, NULL);
377	if (RT_SUCCESS(rc))
378	{
379	/*
380	* Allocate a tracker node first.
381	*/
382	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTMemAllocZ(sizeof(RTMEMSAFERNODE));
383	if (pThis)
384	{
385	/*
386	* Prepare the allocation.
387	*/
388	pThis->cbUser = cb;
389	pThis->offUser = (RTRandU32Ex(0, 128) * RTMEMSAFER_ALIGN) & PAGE_OFFSET_MASK;
390
391	size_t cbNeeded = pThis->offUser + pThis->cbUser;
392	cbNeeded = RT_ALIGN_Z(cbNeeded, PAGE_SIZE);
393
394	pThis->cPages = (uint32_t)(cbNeeded / PAGE_SIZE) + 2; /* +2 for guard pages */
395
396	/*
397	* Try allocate the memory, using the best allocator by default and
398	* falling back on the less safe one.
399	*/
400	rc = rtMemSaferSupR3AllocPages(pThis);
401	if (RT_SUCCESS(rc))
402	pThis->enmAllocator = RTMEMSAFERALLOCATOR_SUPR3;
403	else if (!(fFlags & RTMEMSAFER_F_REQUIRE_NOT_PAGABLE))
404	{
405	rc = rtMemSaferMemAllocPages(pThis);
406	if (RT_SUCCESS(rc))
407	pThis->enmAllocator = RTMEMSAFERALLOCATOR_RTMEMPAGE;
408	}
409	if (RT_SUCCESS(rc))
410	{
411	/*
412	* Insert the node.
413	*/
414	*ppvNew = pThis->Core.Key;
415	rtMemSaferNodeInsert(pThis); /* (Scrambles Core.Key) */
416	return VINF_SUCCESS;
417	}
418
419	RTMemFree(pThis);
420	}
421	else
422	rc = VERR_NO_MEMORY;
423	}
424	return rc;
425	}
426	RT_EXPORT_SYMBOL(RTMemSaferAllocZExTag);
427
428
429	RTDECL(void) RTMemSaferFree(void *pv, size_t cb) RT_NO_THROW_DEF
430	{
431	if (pv)
432	{
433	PRTMEMSAFERNODE pThis = rtMemSaferNodeRemove(pv);
434	AssertReturnVoid(pThis);
435	AssertMsg(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser));
436
437	/*
438	* Wipe the user memory first.
439	*/
440	RTMemWipeThoroughly(pv, RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN), 3);
441
442	/*
443	* Free the pages.
444	*/
445	uint8_t pbPages = (uint8_t )pv - pThis->offUser - PAGE_SIZE;
446	size_t cbPages = (size_t)pThis->cPages * PAGE_SIZE;
447	switch (pThis->enmAllocator)
448	{
449	#ifdef IN_SUP_R3
450	case RTMEMSAFERALLOCATOR_SUPR3:
451	SUPR3PageProtect(pbPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
452	SUPR3PageProtect(pbPages, NIL_RTR0PTR, (uint32_t)(cbPages - PAGE_SIZE), PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
453	SUPR3PageFreeEx(pbPages, pThis->cPages);
454	break;
455	#endif
456	case RTMEMSAFERALLOCATOR_RTMEMPAGE:
457	RTMemProtect(pbPages, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
458	RTMemProtect(pbPages + cbPages - PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
459	RTMemPageFree(pbPages, cbPages);
460	break;
461
462	default:
463	AssertFailed();
464	}
465
466	/*
467	* Free the tracking node.
468	*/
469	pThis->Core.Key = NULL;
470	pThis->offUser = 0;
471	pThis->cbUser = 0;
472	RTMemFree(pThis);
473	}
474	else
475	Assert(cb == 0);
476	}
477	RT_EXPORT_SYMBOL(RTMemSaferFree);
478
479
480	/**
481	* The simplest reallocation method: allocate new block, copy over the data,
482	* free old block.
483	*/
484	static int rtMemSaferReallocSimpler(size_t cbOld, void pvOld, size_t cbNew, void ppvNew, uint32_t fFlags, const char pszTag)
485	{
486	void *pvNew;
487	int rc = RTMemSaferAllocZExTag(&pvNew, cbNew, fFlags, pszTag);
488	if (RT_SUCCESS(rc))
489	{
490	memcpy(pvNew, pvOld, RT_MIN(cbNew, cbOld));
491	RTMemSaferFree(pvOld, cbOld);
492	*ppvNew = pvNew;
493	}
494	return rc;
495	}
496
497
498	RTDECL(int) RTMemSaferReallocZExTag(size_t cbOld, void pvOld, size_t cbNew, void ppvNew, uint32_t fFlags, const char pszTag) RT_NO_THROW_DEF
499	{
500	int rc;
501	/* Real realloc. */
502	if (cbNew && cbOld)
503	{
504	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pvOld);
505	AssertReturn(pThis, VERR_INVALID_POINTER);
506	AssertMsgStmt(cbOld == pThis->cbUser, ("cbOld=%#zx != %#zx\n", cbOld, pThis->cbUser), cbOld = pThis->cbUser);
507
508	if (pThis->fFlags == fFlags)
509	{
510	if (cbNew > cbOld)
511	{
512	/*
513	* Is the enough room for us to grow?
514	*/
515	size_t cbMax = (size_t)(pThis->cPages - 2) * PAGE_SIZE;
516	if (cbNew <= cbMax)
517	{
518	size_t const cbAdded = (cbNew - cbOld);
519	size_t const cbAfter = cbMax - pThis->offUser - cbOld;
520	if (cbAfter >= cbAdded)
521	{
522	/*
523	* Sufficient space after the current allocation.
524	*/
525	uint8_t pbNewSpace = (uint8_t )pvOld + cbOld;
526	RT_BZERO(pbNewSpace, cbAdded);
527	*ppvNew = pvOld;
528	}
529	else
530	{
531	/*
532	* Have to move the allocation to make enough room at the
533	* end. In order to make it a little less predictable and
534	* maybe avoid a relocation or two in the next call, divide
535	* the page offset by four until it it fits.
536	*/
537	AssertReturn(rtMemSaferNodeRemove(pvOld) == pThis, VERR_INTERNAL_ERROR_3);
538	uint32_t offNewUser = pThis->offUser;
539	do
540	offNewUser = offNewUser / 2;
541	while ((pThis->offUser - offNewUser) + cbAfter < cbAdded);
542	offNewUser &= ~(RTMEMSAFER_ALIGN - 1U);
543
544	uint32_t const cbMove = pThis->offUser - offNewUser;
545	uint8_t pbNew = (uint8_t )pvOld - cbMove;
546	memmove(pbNew, pvOld, cbOld);
547
548	RT_BZERO(pbNew + cbOld, cbAdded);
549	if (cbMove > cbAdded)
550	RTMemWipeThoroughly(pbNew + cbNew, cbMove - cbAdded, 3);
551
552	pThis->offUser = offNewUser;
553	pThis->Core.Key = pbNew;
554	*ppvNew = pbNew;
555
556	rtMemSaferNodeInsert(pThis);
557	}
558	Assert(((uintptr_t)*ppvNew & PAGE_OFFSET_MASK) == pThis->offUser);
559	pThis->cbUser = cbNew;
560	rc = VINF_SUCCESS;
561	}
562	else
563	{
564	/*
565	* Not enough space, allocate a new block and copy over the data.
566	*/
567	rc = rtMemSaferReallocSimpler(cbOld, pvOld, cbNew, ppvNew, fFlags, pszTag);
568	}
569	}
570	else
571	{
572	/*
573	* Shrinking the allocation, just wipe the memory that is no longer
574	* being used.
575	*/
576	if (cbNew != cbOld)
577	{
578	uint8_t pbAbandond = (uint8_t )pvOld + cbNew;
579	RTMemWipeThoroughly(pbAbandond, cbOld - cbNew, 3);
580	}
581	pThis->cbUser = cbNew;
582	*ppvNew = pvOld;
583	rc = VINF_SUCCESS;
584	}
585	}
586	else if (!pThis->fFlags)
587	{
588	/*
589	* New flags added. Allocate a new block and copy over the old one.
590	*/
591	rc = rtMemSaferReallocSimpler(cbOld, pvOld, cbNew, ppvNew, fFlags, pszTag);
592	}
593	else
594	{
595	/* Compatible flags. */
596	AssertMsgFailed(("fFlags=%#x old=%#x\n", fFlags, pThis->fFlags));
597	rc = VERR_INVALID_FLAGS;
598	}
599	}
600	/*
601	* First allocation. Pass it on.
602	*/
603	else if (!cbOld)
604	{
605	Assert(pvOld == NULL);
606	rc = RTMemSaferAllocZExTag(ppvNew, cbNew, fFlags, pszTag);
607	}
608	/*
609	* Free operation. Pass it on.
610	*/
611	else
612	{
613	RTMemSaferFree(pvOld, cbOld);
614	*ppvNew = NULL;
615	rc = VINF_SUCCESS;
616	}
617	return rc;
618	}
619	RT_EXPORT_SYMBOL(RTMemSaferReallocZExTag);
620
621
622	RTDECL(void ) RTMemSaferAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
623	{
624	void *pvNew = NULL;
625	int rc = RTMemSaferAllocZExTag(&pvNew, cb, 0 /fFlags/, pszTag);
626	if (RT_SUCCESS(rc))
627	return pvNew;
628	return NULL;
629	}
630	RT_EXPORT_SYMBOL(RTMemSaferAllocZTag);
631
632
633	RTDECL(void ) RTMemSaferReallocZTag(size_t cbOld, void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
634	{
635	void *pvNew = NULL;
636	int rc = RTMemSaferReallocZExTag(cbOld, pvOld, cbNew, &pvNew, 0 /fFlags/, pszTag);
637	if (RT_SUCCESS(rc))
638	return pvNew;
639	return NULL;
640	}
641	RT_EXPORT_SYMBOL(RTMemSaferReallocZTag);
642

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source: vbox/trunk/src/VBox/Runtime/r3/memsafer-r3.cpp@ 62534

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