memsafer-r3.cpp@ 77754

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1	/* $Id: memsafer-r3.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocate for Sensitive Data, generic heap-based implementation.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 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/err.h>
39	#include <iprt/mem.h>
40	#include <iprt/once.h>
41	#include <iprt/rand.h>
42	#include <iprt/param.h>
43	#include <iprt/string.h>
44	#ifdef IN_SUP_R3
45	# include <VBox/sup.h>
46	#endif
47
48
49	/*********************************************************************************************************************************
50	* Defined Constants And Macros *
51	*********************************************************************************************************************************/
52	/** Allocation size alignment (power of two). */
53	#define RTMEMSAFER_ALIGN 16
54
55
56	/*********************************************************************************************************************************
57	* Structures and Typedefs *
58	*********************************************************************************************************************************/
59	/**
60	* Allocators.
61	*/
62	typedef enum RTMEMSAFERALLOCATOR
63	{
64	/** Invalid method. */
65	RTMEMSAFERALLOCATOR_INVALID = 0,
66	/** RTMemPageAlloc. */
67	RTMEMSAFERALLOCATOR_RTMEMPAGE,
68	/** SUPR3PageAllocEx. */
69	RTMEMSAFERALLOCATOR_SUPR3
70	} RTMEMSAFERALLOCATOR;
71
72	/**
73	* Tracking node (lives on normal heap).
74	*/
75	typedef struct RTMEMSAFERNODE
76	{
77	/** Node core.
78	* The core key is a scrambled pointer the user memory. */
79	AVLPVNODECORE Core;
80	/** The allocation flags. */
81	uint32_t fFlags;
82	/** The offset into the allocation of the user memory. */
83	uint32_t offUser;
84	/** The requested allocation size. */
85	size_t cbUser;
86	/** The allocation size in pages, this includes the two guard pages. */
87	uint32_t cPages;
88	/** The allocator used for this node. */
89	RTMEMSAFERALLOCATOR enmAllocator;
90	/** XOR scrambler value for memory. */
91	uintptr_t uScramblerXor;
92	} RTMEMSAFERNODE;
93	/** Pointer to an allocation tracking node. */
94	typedef RTMEMSAFERNODE *PRTMEMSAFERNODE;
95
96
97	/*********************************************************************************************************************************
98	* Global Variables *
99	*********************************************************************************************************************************/
100	/** Init once structure for this module. */
101	static RTONCE g_MemSaferOnce = RTONCE_INITIALIZER;
102	/** Critical section protecting the allocation tree. */
103	static RTCRITSECTRW g_MemSaferCritSect;
104	/** Tree of allocation nodes. */
105	static AVLPVTREE g_pMemSaferTree;
106	/** XOR scrambler value pointers. */
107	static uintptr_t g_uMemSaferPtrScramblerXor;
108	/** Pointer rotate shift count.*/
109	static uintptr_t g_cMemSaferPtrScramblerRotate;
110
111
112	/**
113	* @callback_method_impl{FNRTONCE, Inits globals.}
114	*/
115	static DECLCALLBACK(int32_t) rtMemSaferOnceInit(void *pvUserIgnore)
116	{
117	RT_NOREF_PV(pvUserIgnore);
118
119	g_uMemSaferPtrScramblerXor = (uintptr_t)RTRandU64();
120	g_cMemSaferPtrScramblerRotate = RTRandU32Ex(0, ARCH_BITS - 1);
121	return RTCritSectRwInit(&g_MemSaferCritSect);
122	}
123
124
125	/**
126	* @callback_method_impl{PFNRTONCECLEANUP, Cleans up globals.}
127	*/
128	static DECLCALLBACK(void) rtMemSaferOnceTerm(void *pvUser, bool fLazyCleanUpOk)
129	{
130	RT_NOREF_PV(pvUser);
131
132	if (!fLazyCleanUpOk)
133	{
134	RTCritSectRwDelete(&g_MemSaferCritSect);
135	Assert(!g_pMemSaferTree);
136	}
137	}
138
139
140
141	DECLINLINE(void ) rtMemSaferScramblePointer(void pvUser)
142	{
143	uintptr_t uPtr = (uintptr_t)pvUser;
144	uPtr ^= g_uMemSaferPtrScramblerXor;
145	#if ARCH_BITS == 64
146	uPtr = ASMRotateRightU64(uPtr, g_cMemSaferPtrScramblerRotate);
147	#elif ARCH_BITS == 32
148	uPtr = ASMRotateRightU32(uPtr, g_cMemSaferPtrScramblerRotate);
149	#else
150	# error "Unsupported/missing ARCH_BITS."
151	#endif
152	return (void *)uPtr;
153	}
154
155
156	/**
157	* Inserts a tracking node into the tree.
158	*
159	* @param pThis The allocation tracking node to insert.
160	*/
161	static void rtMemSaferNodeInsert(PRTMEMSAFERNODE pThis)
162	{
163	RTCritSectRwEnterExcl(&g_MemSaferCritSect);
164	pThis->Core.Key = rtMemSaferScramblePointer(pThis->Core.Key);
165	bool fRc = RTAvlPVInsert(&g_pMemSaferTree, &pThis->Core);
166	RTCritSectRwLeaveExcl(&g_MemSaferCritSect);
167	Assert(fRc); NOREF(fRc);
168	}
169
170
171	/**
172	* Finds a tracking node into the tree.
173	*
174	* @returns The allocation tracking node for @a pvUser. NULL if not found.
175	* @param pvUser The user pointer to the allocation.
176	*/
177	static PRTMEMSAFERNODE rtMemSaferNodeLookup(void *pvUser)
178	{
179	void *pvKey = rtMemSaferScramblePointer(pvUser);
180	RTCritSectRwEnterShared(&g_MemSaferCritSect);
181	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTAvlPVGet(&g_pMemSaferTree, pvKey);
182	RTCritSectRwLeaveShared(&g_MemSaferCritSect);
183	return pThis;
184	}
185
186
187	/**
188	* Removes a tracking node from the tree.
189	*
190	* @returns The allocation tracking node for @a pvUser. NULL if not found.
191	* @param pvUser The user pointer to the allocation.
192	*/
193	static PRTMEMSAFERNODE rtMemSaferNodeRemove(void *pvUser)
194	{
195	void *pvKey = rtMemSaferScramblePointer(pvUser);
196	RTCritSectRwEnterExcl(&g_MemSaferCritSect);
197	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTAvlPVRemove(&g_pMemSaferTree, pvKey);
198	RTCritSectRwLeaveExcl(&g_MemSaferCritSect);
199	return pThis;
200	}
201
202
203	RTDECL(int) RTMemSaferScramble(void *pv, size_t cb)
204	{
205	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pv);
206	AssertReturn(pThis, VERR_INVALID_POINTER);
207	AssertMsgReturn(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser), VERR_INVALID_PARAMETER);
208
209	/* First time we get a new xor value. */
210	if (!pThis->uScramblerXor)
211	pThis->uScramblerXor = (uintptr_t)RTRandU64();
212
213	/* Note! This isn't supposed to be safe, just less obvious. */
214	uintptr_t pu = (uintptr_t )pv;
215	cb = RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN);
216	while (cb > 0)
217	{
218	*pu ^= pThis->uScramblerXor;
219	pu++;
220	cb -= sizeof(*pu);
221	}
222
223	return VINF_SUCCESS;
224	}
225	RT_EXPORT_SYMBOL(RTMemSaferScramble);
226
227
228	RTDECL(int) RTMemSaferUnscramble(void *pv, size_t cb)
229	{
230	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pv);
231	AssertReturn(pThis, VERR_INVALID_POINTER);
232	AssertMsgReturn(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser), VERR_INVALID_PARAMETER);
233
234	/* Note! This isn't supposed to be safe, just less obvious. */
235	uintptr_t pu = (uintptr_t )pv;
236	cb = RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN);
237	while (cb > 0)
238	{
239	*pu ^= pThis->uScramblerXor;
240	pu++;
241	cb -= sizeof(*pu);
242	}
243
244	return VINF_SUCCESS;
245	}
246	RT_EXPORT_SYMBOL(RTMemSaferUnscramble);
247
248
249	/**
250	* Initializes the pages.
251	*
252	* Fills the memory with random bytes in order to make it less obvious where the
253	* secret data starts and ends. We also zero the user memory in case the
254	* allocator does not do this.
255	*
256	* @param pThis The allocation tracer node. The Core.Key member
257	* will be set.
258	* @param pvPages The pages to initialize.
259	*/
260	static void rtMemSaferInitializePages(PRTMEMSAFERNODE pThis, void *pvPages)
261	{
262	RTRandBytes(pvPages, PAGE_SIZE + pThis->offUser);
263
264	uint8_t pbUser = (uint8_t )pvPages + PAGE_SIZE + pThis->offUser;
265	pThis->Core.Key = pbUser;
266	RT_BZERO(pbUser, pThis->cbUser); /* paranoia */
267
268	RTRandBytes(pbUser + pThis->cbUser, (size_t)pThis->cPages * PAGE_SIZE - PAGE_SIZE - pThis->offUser - pThis->cbUser);
269	}
270
271
272	/**
273	* Allocates and initializes pages from the support driver and initializes it.
274	*
275	* @returns VBox status code.
276	* @param pThis The allocator node. Core.Key will be set on successful
277	* return (unscrambled).
278	*/
279	static int rtMemSaferSupR3AllocPages(PRTMEMSAFERNODE pThis)
280	{
281	#ifdef IN_SUP_R3
282	/*
283	* Try allocate the memory.
284	*/
285	void *pvPages;
286	int rc = SUPR3PageAllocEx(pThis->cPages, 0 /* fFlags /, &pvPages, NULL / pR0Ptr /, NULL / paPages */);
287	if (RT_SUCCESS(rc))
288	{
289	rtMemSaferInitializePages(pThis, pvPages);
290
291	/*
292	* On darwin we cannot allocate pages without an R0 mapping and
293	* SUPR3PageAllocEx falls back to another method which is incompatible with
294	* the way SUPR3PageProtect works. Ignore changing the protection of the guard
295	* pages.
296	*/
297	#ifdef RT_OS_DARWIN
298	return VINF_SUCCESS;
299	#else
300	/*
301	* Configure the guard pages.
302	* SUPR3PageProtect isn't supported on all hosts, we ignore that.
303	*/
304	rc = SUPR3PageProtect(pvPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_NONE);
305	if (RT_SUCCESS(rc))
306	{
307	rc = SUPR3PageProtect(pvPages, NIL_RTR0PTR, (pThis->cPages - 1) * PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_NONE);
308	if (RT_SUCCESS(rc))
309	return VINF_SUCCESS;
310	SUPR3PageProtect(pvPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
311	}
312	else if (rc == VERR_NOT_SUPPORTED)
313	return VINF_SUCCESS;
314
315	/* failed. */
316	int rc2 = SUPR3PageFreeEx(pvPages, pThis->cPages); AssertRC(rc2);
317	#endif
318	}
319	return rc;
320
321	#else /* !IN_SUP_R3 */
322	RT_NOREF_PV(pThis);
323	return VERR_NOT_SUPPORTED;
324	#endif /* !IN_SUP_R3 */
325	}
326
327
328	/**
329	* Allocates and initializes pages using the IPRT page allocator API.
330	*
331	* @returns VBox status code.
332	* @param pThis The allocator node. Core.Key will be set on successful
333	* return (unscrambled).
334	*/
335	static int rtMemSaferMemAllocPages(PRTMEMSAFERNODE pThis)
336	{
337	/*
338	* Try allocate the memory.
339	*/
340	int rc = VINF_SUCCESS;
341	void pvPages = RTMemPageAlloc((size_t)pThis->cPages PAGE_SIZE);
342	if (pvPages)
343	{
344	rtMemSaferInitializePages(pThis, pvPages);
345
346	/*
347	* Configure the guard pages.
348	*/
349	rc = RTMemProtect(pvPages, PAGE_SIZE, RTMEM_PROT_NONE);
350	if (RT_SUCCESS(rc))
351	{
352	rc = RTMemProtect((uint8_t )pvPages + (size_t)(pThis->cPages - 1U) PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_NONE);
353	if (RT_SUCCESS(rc))
354	return VINF_SUCCESS;
355	rc = RTMemProtect(pvPages, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
356	}
357
358	/* failed. */
359	RTMemPageFree(pvPages, (size_t)pThis->cPages * PAGE_SIZE);
360	}
361	else
362	rc = VERR_NO_PAGE_MEMORY;
363
364	return rc;
365	}
366
367
368	RTDECL(int) RTMemSaferAllocZExTag(void *ppvNew, size_t cb, uint32_t fFlags, const char pszTag) RT_NO_THROW_DEF
369	{
370	RT_NOREF_PV(pszTag);
371
372	/*
373	* Validate input.
374	*/
375	AssertPtrReturn(ppvNew, VERR_INVALID_PARAMETER);
376	*ppvNew = NULL;
377	AssertReturn(cb, VERR_INVALID_PARAMETER);
378	AssertReturn(cb <= 32U_1M - PAGE_SIZE 3U, VERR_ALLOCATION_TOO_BIG); /* Max 32 MB minus padding and guard pages. */
379	AssertReturn(!(fFlags & ~RTMEMSAFER_F_VALID_MASK), VERR_INVALID_FLAGS);
380
381	/*
382	* Initialize globals.
383	*/
384	int rc = RTOnceEx(&g_MemSaferOnce, rtMemSaferOnceInit, rtMemSaferOnceTerm, NULL);
385	if (RT_SUCCESS(rc))
386	{
387	/*
388	* Allocate a tracker node first.
389	*/
390	PRTMEMSAFERNODE pThis = (PRTMEMSAFERNODE)RTMemAllocZ(sizeof(RTMEMSAFERNODE));
391	if (pThis)
392	{
393	/*
394	* Prepare the allocation.
395	*/
396	pThis->cbUser = cb;
397	pThis->offUser = (RTRandU32Ex(0, 128) * RTMEMSAFER_ALIGN) & PAGE_OFFSET_MASK;
398
399	size_t cbNeeded = pThis->offUser + pThis->cbUser;
400	cbNeeded = RT_ALIGN_Z(cbNeeded, PAGE_SIZE);
401
402	pThis->cPages = (uint32_t)(cbNeeded / PAGE_SIZE) + 2; /* +2 for guard pages */
403
404	/*
405	* Try allocate the memory, using the best allocator by default and
406	* falling back on the less safe one.
407	*/
408	rc = rtMemSaferSupR3AllocPages(pThis);
409	if (RT_SUCCESS(rc))
410	pThis->enmAllocator = RTMEMSAFERALLOCATOR_SUPR3;
411	else if (!(fFlags & RTMEMSAFER_F_REQUIRE_NOT_PAGABLE))
412	{
413	rc = rtMemSaferMemAllocPages(pThis);
414	if (RT_SUCCESS(rc))
415	pThis->enmAllocator = RTMEMSAFERALLOCATOR_RTMEMPAGE;
416	}
417	if (RT_SUCCESS(rc))
418	{
419	/*
420	* Insert the node.
421	*/
422	*ppvNew = pThis->Core.Key;
423	rtMemSaferNodeInsert(pThis); /* (Scrambles Core.Key) */
424	return VINF_SUCCESS;
425	}
426
427	RTMemFree(pThis);
428	}
429	else
430	rc = VERR_NO_MEMORY;
431	}
432	return rc;
433	}
434	RT_EXPORT_SYMBOL(RTMemSaferAllocZExTag);
435
436
437	RTDECL(void) RTMemSaferFree(void *pv, size_t cb) RT_NO_THROW_DEF
438	{
439	if (pv)
440	{
441	PRTMEMSAFERNODE pThis = rtMemSaferNodeRemove(pv);
442	AssertReturnVoid(pThis);
443	AssertMsg(cb == pThis->cbUser, ("cb=%#zx != %#zx\n", cb, pThis->cbUser));
444
445	/*
446	* Wipe the user memory first.
447	*/
448	RTMemWipeThoroughly(pv, RT_ALIGN_Z(cb, RTMEMSAFER_ALIGN), 3);
449
450	/*
451	* Free the pages.
452	*/
453	uint8_t pbPages = (uint8_t )pv - pThis->offUser - PAGE_SIZE;
454	size_t cbPages = (size_t)pThis->cPages * PAGE_SIZE;
455	switch (pThis->enmAllocator)
456	{
457	#ifdef IN_SUP_R3
458	case RTMEMSAFERALLOCATOR_SUPR3:
459	SUPR3PageProtect(pbPages, NIL_RTR0PTR, 0, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
460	SUPR3PageProtect(pbPages, NIL_RTR0PTR, (uint32_t)(cbPages - PAGE_SIZE), PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
461	SUPR3PageFreeEx(pbPages, pThis->cPages);
462	break;
463	#endif
464	case RTMEMSAFERALLOCATOR_RTMEMPAGE:
465	RTMemProtect(pbPages, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
466	RTMemProtect(pbPages + cbPages - PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_READ \| RTMEM_PROT_WRITE);
467	RTMemPageFree(pbPages, cbPages);
468	break;
469
470	default:
471	AssertFailed();
472	}
473
474	/*
475	* Free the tracking node.
476	*/
477	pThis->Core.Key = NULL;
478	pThis->offUser = 0;
479	pThis->cbUser = 0;
480	RTMemFree(pThis);
481	}
482	else
483	Assert(cb == 0);
484	}
485	RT_EXPORT_SYMBOL(RTMemSaferFree);
486
487
488	/**
489	* The simplest reallocation method: allocate new block, copy over the data,
490	* free old block.
491	*/
492	static int rtMemSaferReallocSimpler(size_t cbOld, void pvOld, size_t cbNew, void ppvNew, uint32_t fFlags, const char pszTag)
493	{
494	void *pvNew;
495	int rc = RTMemSaferAllocZExTag(&pvNew, cbNew, fFlags, pszTag);
496	if (RT_SUCCESS(rc))
497	{
498	memcpy(pvNew, pvOld, RT_MIN(cbNew, cbOld));
499	RTMemSaferFree(pvOld, cbOld);
500	*ppvNew = pvNew;
501	}
502	return rc;
503	}
504
505
506	RTDECL(int) RTMemSaferReallocZExTag(size_t cbOld, void pvOld, size_t cbNew, void ppvNew, uint32_t fFlags, const char pszTag) RT_NO_THROW_DEF
507	{
508	int rc;
509	/* Real realloc. */
510	if (cbNew && cbOld)
511	{
512	PRTMEMSAFERNODE pThis = rtMemSaferNodeLookup(pvOld);
513	AssertReturn(pThis, VERR_INVALID_POINTER);
514	AssertMsgStmt(cbOld == pThis->cbUser, ("cbOld=%#zx != %#zx\n", cbOld, pThis->cbUser), cbOld = pThis->cbUser);
515
516	if (pThis->fFlags == fFlags)
517	{
518	if (cbNew > cbOld)
519	{
520	/*
521	* Is the enough room for us to grow?
522	*/
523	size_t cbMax = (size_t)(pThis->cPages - 2) * PAGE_SIZE;
524	if (cbNew <= cbMax)
525	{
526	size_t const cbAdded = (cbNew - cbOld);
527	size_t const cbAfter = cbMax - pThis->offUser - cbOld;
528	if (cbAfter >= cbAdded)
529	{
530	/*
531	* Sufficient space after the current allocation.
532	*/
533	uint8_t pbNewSpace = (uint8_t )pvOld + cbOld;
534	RT_BZERO(pbNewSpace, cbAdded);
535	*ppvNew = pvOld;
536	}
537	else
538	{
539	/*
540	* Have to move the allocation to make enough room at the
541	* end. In order to make it a little less predictable and
542	* maybe avoid a relocation or two in the next call, divide
543	* the page offset by four until it it fits.
544	*/
545	AssertReturn(rtMemSaferNodeRemove(pvOld) == pThis, VERR_INTERNAL_ERROR_3);
546	uint32_t offNewUser = pThis->offUser;
547	do
548	offNewUser = offNewUser / 2;
549	while ((pThis->offUser - offNewUser) + cbAfter < cbAdded);
550	offNewUser &= ~(RTMEMSAFER_ALIGN - 1U);
551
552	uint32_t const cbMove = pThis->offUser - offNewUser;
553	uint8_t pbNew = (uint8_t )pvOld - cbMove;
554	memmove(pbNew, pvOld, cbOld);
555
556	RT_BZERO(pbNew + cbOld, cbAdded);
557	if (cbMove > cbAdded)
558	RTMemWipeThoroughly(pbNew + cbNew, cbMove - cbAdded, 3);
559
560	pThis->offUser = offNewUser;
561	pThis->Core.Key = pbNew;
562	*ppvNew = pbNew;
563
564	rtMemSaferNodeInsert(pThis);
565	}
566	Assert(((uintptr_t)*ppvNew & PAGE_OFFSET_MASK) == pThis->offUser);
567	pThis->cbUser = cbNew;
568	rc = VINF_SUCCESS;
569	}
570	else
571	{
572	/*
573	* Not enough space, allocate a new block and copy over the data.
574	*/
575	rc = rtMemSaferReallocSimpler(cbOld, pvOld, cbNew, ppvNew, fFlags, pszTag);
576	}
577	}
578	else
579	{
580	/*
581	* Shrinking the allocation, just wipe the memory that is no longer
582	* being used.
583	*/
584	if (cbNew != cbOld)
585	{
586	uint8_t pbAbandond = (uint8_t )pvOld + cbNew;
587	RTMemWipeThoroughly(pbAbandond, cbOld - cbNew, 3);
588	}
589	pThis->cbUser = cbNew;
590	*ppvNew = pvOld;
591	rc = VINF_SUCCESS;
592	}
593	}
594	else if (!pThis->fFlags)
595	{
596	/*
597	* New flags added. Allocate a new block and copy over the old one.
598	*/
599	rc = rtMemSaferReallocSimpler(cbOld, pvOld, cbNew, ppvNew, fFlags, pszTag);
600	}
601	else
602	{
603	/* Compatible flags. */
604	AssertMsgFailed(("fFlags=%#x old=%#x\n", fFlags, pThis->fFlags));
605	rc = VERR_INVALID_FLAGS;
606	}
607	}
608	/*
609	* First allocation. Pass it on.
610	*/
611	else if (!cbOld)
612	{
613	Assert(pvOld == NULL);
614	rc = RTMemSaferAllocZExTag(ppvNew, cbNew, fFlags, pszTag);
615	}
616	/*
617	* Free operation. Pass it on.
618	*/
619	else
620	{
621	RTMemSaferFree(pvOld, cbOld);
622	*ppvNew = NULL;
623	rc = VINF_SUCCESS;
624	}
625	return rc;
626	}
627	RT_EXPORT_SYMBOL(RTMemSaferReallocZExTag);
628
629
630	RTDECL(void ) RTMemSaferAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
631	{
632	void *pvNew = NULL;
633	int rc = RTMemSaferAllocZExTag(&pvNew, cb, 0 /fFlags/, pszTag);
634	if (RT_SUCCESS(rc))
635	return pvNew;
636	return NULL;
637	}
638	RT_EXPORT_SYMBOL(RTMemSaferAllocZTag);
639
640
641	RTDECL(void ) RTMemSaferReallocZTag(size_t cbOld, void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
642	{
643	void *pvNew = NULL;
644	int rc = RTMemSaferReallocZExTag(cbOld, pvOld, cbNew, &pvNew, 0 /fFlags/, pszTag);
645	if (RT_SUCCESS(rc))
646	return pvNew;
647	return NULL;
648	}
649	RT_EXPORT_SYMBOL(RTMemSaferReallocZTag);
650

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source: vbox/trunk/src/VBox/Runtime/r3/memsafer-r3.cpp@ 77754

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