PATMSSM.cpp@ 1284

Last change on this file since 1284 was 302, checked in by vboxsync, 18 years ago
Handle iret to ring 0 code with IF cleared. Warning: possibly dangerous change.
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1	/* $Id: PATMSSM.cpp 302 2007-01-25 14:48:55Z vboxsync $ */
2	/** @file
3	* PATMSSM - Dynamic Guest OS Patching Manager; Save and load state
4	*
5	* NOTE: CSAM assumes patch memory is never reused!!
6	*/
7
8	/*
9	* Copyright (C) 2006 InnoTek Systemberatung GmbH
10	*
11	* This file is part of VirtualBox Open Source Edition (OSE), as
12	* available from http://www.virtualbox.org. This file is free software;
13	* you can redistribute it and/or modify it under the terms of the GNU
14	* General Public License as published by the Free Software Foundation,
15	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
16	* distribution. VirtualBox OSE is distributed in the hope that it will
17	* be useful, but WITHOUT ANY WARRANTY of any kind.
18	*
19	* If you received this file as part of a commercial VirtualBox
20	* distribution, then only the terms of your commercial VirtualBox
21	* license agreement apply instead of the previous paragraph.
22	*/
23
24	/*******************************************************************************
25	* Header Files *
26	*******************************************************************************/
27	#define LOG_GROUP LOG_GROUP_PATM
28	#include <VBox/patm.h>
29	#include <VBox/stam.h>
30	#include <VBox/pgm.h>
31	#include <VBox/cpum.h>
32	#include <VBox/iom.h>
33	#include <VBox/sup.h>
34	#include <VBox/mm.h>
35	#include <VBox/ssm.h>
36	#include <VBox/pdm.h>
37	#include <VBox/trpm.h>
38	#include <VBox/param.h>
39	#include <iprt/avl.h>
40	#include "PATMInternal.h"
41	#include "PATMPatch.h"
42	#include "PATMA.h"
43	#include <VBox/vm.h>
44	#include <VBox/csam.h>
45
46	#include <VBox/dbg.h>
47	#include <VBox/err.h>
48	#include <VBox/log.h>
49	#include <iprt/assert.h>
50	#include <iprt/asm.h>
51	#include <iprt/string.h>
52	#include <VBox/dis.h>
53	#include <VBox/disopcode.h>
54
55	#define PATM_SUBTRACT_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) - (uintptr_t)(b)
56	#define PATM_ADD_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) + (uintptr_t)(b)
57
58	#ifdef VBOX_STRICT
59	/**
60	* Callback function for RTAvlPVDoWithAll
61	*
62	* Counts the number of patches in the tree
63	*
64	* @returns VBox status code.
65	* @param pNode Current node
66	* @param pcPatches Pointer to patch counter (uint32_t)
67	*/
68	static DECLCALLBACK(int) patmCountLeafPV(PAVLPVNODECORE pNode, void *pcPatches)
69	{
70	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
71	return VINF_SUCCESS;
72	}
73
74	/**
75	* Callback function for RTAvlU32DoWithAll
76	*
77	* Counts the number of patches in the tree
78	*
79	* @returns VBox status code.
80	* @param pNode Current node
81	* @param pcPatches Pointer to patch counter (uint32_t)
82	*/
83	static DECLCALLBACK(int) patmCountLeaf(PAVLU32NODECORE pNode, void *pcPatches)
84	{
85	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
86	return VINF_SUCCESS;
87	}
88	#endif /* VBOX_STRICT */
89
90	/**
91	* Callback function for RTAvloGCPtrDoWithAll
92	*
93	* Counts the number of patches in the tree
94	*
95	* @returns VBox status code.
96	* @param pNode Current node
97	* @param pcPatches Pointer to patch counter
98	*/
99	static DECLCALLBACK(int) patmCountPatch(PAVLOGCPTRNODECORE pNode, void *pcPatches)
100	{
101	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
102	return VINF_SUCCESS;
103	}
104
105	/**
106	* Callback function for RTAvlU32DoWithAll
107	*
108	* Saves all patch to guest lookup records.
109	*
110	* @returns VBox status code.
111	* @param pNode Current node
112	* @param pVM1 VM Handle
113	*/
114	static DECLCALLBACK(int) patmSaveP2GLookupRecords(PAVLU32NODECORE pNode, void *pVM1)
115	{
116	PVM pVM = (PVM)pVM1;
117	PSSMHANDLE pSSM = pVM->patm.s.savedstate.pSSM;
118	PRECPATCHTOGUEST pPatchToGuestRec = (PRECPATCHTOGUEST)pNode;
119
120	/* Save the lookup record. */
121	int rc = SSMR3PutMem(pSSM, pPatchToGuestRec, sizeof(RECPATCHTOGUEST));
122	AssertRCReturn(rc, rc);
123
124	return VINF_SUCCESS;
125	}
126
127	/**
128	* Callback function for RTAvlPVDoWithAll
129	*
130	* Saves all patch to guest lookup records.
131	*
132	* @returns VBox status code.
133	* @param pNode Current node
134	* @param pVM1 VM Handle
135	*/
136	static DECLCALLBACK(int) patmSaveFixupRecords(PAVLPVNODECORE pNode, void *pVM1)
137	{
138	PVM pVM = (PVM)pVM1;
139	PSSMHANDLE pSSM = pVM->patm.s.savedstate.pSSM;
140	RELOCREC rec = *(PRELOCREC)pNode;
141
142	Assert(rec.pRelocPos);
143	PATM_SUBTRACT_PTR(rec.pRelocPos, pVM->patm.s.pPatchMemHC);
144
145	/* Save the lookup record. */
146	int rc = SSMR3PutMem(pSSM, &rec, sizeof(rec));
147	AssertRCReturn(rc, rc);
148
149	return VINF_SUCCESS;
150	}
151
152
153	/**
154	* Callback function for RTAvloGCPtrDoWithAll
155	*
156	* Saves the state of the patch that's being enumerated
157	*
158	* @returns VBox status code.
159	* @param pNode Current node
160	* @param pVM1 VM Handle
161	*/
162	static DECLCALLBACK(int) patmSavePatchState(PAVLOGCPTRNODECORE pNode, void *pVM1)
163	{
164	PVM pVM = (PVM)pVM1;
165	PPATMPATCHREC pPatch = (PPATMPATCHREC)pNode;
166	PATMPATCHREC patch = *pPatch;
167	PSSMHANDLE pSSM = pVM->patm.s.savedstate.pSSM;
168	int rc;
169
170	Assert(!(pPatch->patch.flags & PATMFL_GLOBAL_FUNCTIONS));
171
172	/*
173	* Reset HC pointers that need to be recalculated when loading the state
174	*/
175	AssertMsg(patch.patch.uState == PATCH_REFUSED \|\| (patch.patch.pPatchBlockOffset \|\| (patch.patch.flags & (PATMFL_SYSENTER_XP\|PATMFL_INT3_REPLACEMENT))),
176	("State = %x pPrivInstrHC=%08x pPatchBlockHC=%08x flags=%x\n", patch.patch.uState, patch.patch.pPrivInstrHC, PATCHCODE_PTR_HC(&patch.patch), patch.patch.flags));
177	Assert(pPatch->patch.JumpTree == 0);
178	Assert(!pPatch->patch.pTempInfo \|\| pPatch->patch.pTempInfo->DisasmJumpTree == 0);
179	Assert(!pPatch->patch.pTempInfo \|\| pPatch->patch.pTempInfo->IllegalInstrTree == 0);
180
181	memset(&patch.patch.cacheRec, 0, sizeof(patch.patch.cacheRec));
182
183	/* Save the patch record itself */
184	rc = SSMR3PutMem(pSSM, &patch, sizeof(patch));
185	AssertRCReturn(rc, rc);
186
187	/*
188	* Reset HC pointers in fixup records and save them.
189	*/
190	#ifdef VBOX_STRICT
191	uint32_t nrFixupRecs = 0;
192	RTAvlPVDoWithAll(&pPatch->patch.FixupTree, true, patmCountLeafPV, &nrFixupRecs);
193	AssertMsg((int32_t)nrFixupRecs == pPatch->patch.nrFixups, ("Fixup inconsistency! counted %d vs %d\n", nrFixupRecs, pPatch->patch.nrFixups));
194	#endif
195	RTAvlPVDoWithAll(&pPatch->patch.FixupTree, true, patmSaveFixupRecords, pVM);
196
197	#ifdef VBOX_STRICT
198	uint32_t nrLookupRecords = 0;
199	RTAvlU32DoWithAll(&pPatch->patch.Patch2GuestAddrTree, true, patmCountLeaf, &nrLookupRecords);
200	Assert(nrLookupRecords == pPatch->patch.nrPatch2GuestRecs);
201	#endif
202
203	RTAvlU32DoWithAll(&pPatch->patch.Patch2GuestAddrTree, true, patmSaveP2GLookupRecords, pVM);
204	return VINF_SUCCESS;
205	}
206
207	/**
208	* Execute state save operation.
209	*
210	* @returns VBox status code.
211	* @param pVM VM Handle.
212	* @param pSSM SSM operation handle.
213	*/
214	DECLCALLBACK(int) patmr3Save(PVM pVM, PSSMHANDLE pSSM)
215	{
216	PATM patmInfo = pVM->patm.s;
217	int rc;
218
219	pVM->patm.s.savedstate.pSSM = pSSM;
220
221	/*
222	* Reset HC pointers that need to be recalculated when loading the state
223	*/
224	patmInfo.pPatchMemHC = NULL;
225	patmInfo.pGCStateHC = 0;
226	patmInfo.pvFaultMonitor = 0;
227
228	Assert(patmInfo.ulCallDepth == 0);
229
230	/*
231	* Count the number of patches in the tree (feeling lazy)
232	*/
233	patmInfo.savedstate.cPatches = 0;
234	RTAvloGCPtrDoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true, patmCountPatch, &patmInfo.savedstate.cPatches);
235
236	/*
237	* Save PATM structure
238	*/
239	rc = SSMR3PutMem(pSSM, &patmInfo, sizeof(patmInfo));
240	AssertRCReturn(rc, rc);
241
242	/*
243	* Save patch memory contents
244	*/
245	rc = SSMR3PutMem(pSSM, pVM->patm.s.pPatchMemHC, pVM->patm.s.cbPatchMem);
246	AssertRCReturn(rc, rc);
247
248	/*
249	* Save GC state memory
250	*/
251	rc = SSMR3PutMem(pSSM, pVM->patm.s.pGCStateHC, sizeof(PATMGCSTATE));
252	AssertRCReturn(rc, rc);
253
254	/*
255	* Save PATM stack page
256	*/
257	rc = SSMR3PutMem(pSSM, pVM->patm.s.pGCStackHC, PATM_STACK_TOTAL_SIZE);
258	AssertRCReturn(rc, rc);
259
260	/*
261	* Save all patches
262	*/
263	rc = RTAvloGCPtrDoWithAll(&pVM->patm.s.PatchLookupTreeHC->PatchTree, true, patmSavePatchState, pVM);
264	AssertRCReturn(rc, rc);
265
266	/** @note patch statistics are not saved. */
267
268	return VINF_SUCCESS;
269	}
270
271	/**
272	* Execute state load operation.
273	*
274	* @returns VBox status code.
275	* @param pVM VM Handle.
276	* @param pSSM SSM operation handle.
277	* @param u32Version Data layout version.
278	*/
279	DECLCALLBACK(int) patmr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
280	{
281	PATM patmInfo;
282	int rc;
283
284	if (u32Version != PATM_SSM_VERSION)
285	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
286
287	pVM->patm.s.savedstate.pSSM = pSSM;
288
289	/*
290	* Restore PATM structure
291	*/
292	rc = SSMR3GetMem(pSSM, &patmInfo, sizeof(patmInfo));
293	AssertRCReturn(rc, rc);
294
295	/** @todo this restriction could be removed as we relocate when loading the saved state,.. */
296	if ( pVM->patm.s.pGCStateGC != patmInfo.pGCStateGC
297	\|\| pVM->patm.s.pCPUMCtxGC != patmInfo.pCPUMCtxGC
298	\|\| pVM->patm.s.pStatsGC != patmInfo.pStatsGC)
299	{
300	AssertMsgFailed(("GC state, stat or cpum ptrs don't match!!!\n"));
301	return VERR_SSM_INVALID_STATE;
302	}
303
304	/* Relative calls are made to the helper functions. Therefor their location must not change! */
305	if ( pVM->patm.s.pfnHelperCallGC != patmInfo.pfnHelperCallGC
306	\|\| pVM->patm.s.pfnHelperRetGC != patmInfo.pfnHelperRetGC
307	\|\| pVM->patm.s.pfnHelperJumpGC != patmInfo.pfnHelperJumpGC
308	\|\| pVM->patm.s.pfnHelperIretGC != patmInfo.pfnHelperIretGC)
309	{
310	AssertMsgFailed(("Helper function ptrs don't match!!!\n"));
311	return VERR_SSM_INVALID_STATE;
312	}
313
314	if ( pVM->patm.s.pPatchMemGC != patmInfo.pPatchMemGC
315	\|\| pVM->patm.s.cbPatchMem != patmInfo.cbPatchMem)
316	{
317	AssertMsgFailed(("Patch memory ptrs and/or sizes don't match!!!\n"));
318	return VERR_SSM_INVALID_STATE;
319	}
320	pVM->patm.s.offPatchMem = patmInfo.offPatchMem;
321	pVM->patm.s.deltaReloc = patmInfo.deltaReloc;
322	pVM->patm.s.uCurrentPatchIdx = patmInfo.uCurrentPatchIdx;
323
324	/* Lowest and highest patched instruction */
325	pVM->patm.s.pPatchedInstrGCLowest = patmInfo.pPatchedInstrGCLowest;
326	pVM->patm.s.pPatchedInstrGCHighest = patmInfo.pPatchedInstrGCHighest;
327
328	/* Sysenter handlers */
329	pVM->patm.s.pfnSysEnterGC = patmInfo.pfnSysEnterGC;
330	pVM->patm.s.pfnSysEnterPatchGC = patmInfo.pfnSysEnterPatchGC;
331	pVM->patm.s.uSysEnterPatchIdx = patmInfo.uSysEnterPatchIdx;
332
333	Assert(patmInfo.ulCallDepth == 0 && pVM->patm.s.ulCallDepth == 0);
334
335	/** @note patch statistics are not restored. */
336
337	/*
338	* Restore patch memory contents
339	*/
340	rc = SSMR3GetMem(pSSM, pVM->patm.s.pPatchMemHC, pVM->patm.s.cbPatchMem);
341	AssertRCReturn(rc, rc);
342
343	/*
344	* Restore GC state memory
345	*/
346	if (pVM->patm.s.pGCStateGC != patmInfo.pGCStateGC)
347	{
348	AssertMsgFailed(("GC patch state ptrs don't match!!!\n"));
349	return VERR_SSM_INVALID_STATE;
350	}
351	rc = SSMR3GetMem(pSSM, pVM->patm.s.pGCStateHC, sizeof(PATMGCSTATE));
352	AssertRCReturn(rc, rc);
353
354	/*
355	* Restore PATM stack page
356	*/
357	if (pVM->patm.s.pGCStackGC != patmInfo.pGCStackGC)
358	{
359	AssertMsgFailed(("GC patch stack ptrs don't match!!!\n"));
360	return VERR_SSM_INVALID_STATE;
361	}
362	rc = SSMR3GetMem(pSSM, pVM->patm.s.pGCStackHC, PATM_STACK_TOTAL_SIZE);
363	AssertRCReturn(rc, rc);
364
365	/*
366	* Load all patches
367	*/
368	for (uint32_t i=0;i<patmInfo.savedstate.cPatches;i++)
369	{
370	PATMPATCHREC patch, *pPatchRec;
371
372	rc = SSMR3GetMem(pSSM, &patch, sizeof(patch));
373	AssertRCReturn(rc, rc);
374
375	Assert(!(patch.patch.flags & PATMFL_GLOBAL_FUNCTIONS));
376
377	rc = MMHyperAlloc(pVM, sizeof(PATMPATCHREC), 0, MM_TAG_PATM_PATCH, (void **)&pPatchRec);
378	if (VBOX_FAILURE(rc))
379	{
380	AssertMsgFailed(("Out of memory!!!!\n"));
381	return VERR_NO_MEMORY;
382	}
383	/*
384	* Only restore the patch part of the tree record; not the internal data (except the key of course)
385	*/
386	pPatchRec->patch = patch.patch;
387	pPatchRec->Core.Key = patch.Core.Key;
388	pPatchRec->CoreOffset.Key = patch.CoreOffset.Key;
389
390	bool ret = RTAvloGCPtrInsert(&pVM->patm.s.PatchLookupTreeHC->PatchTree, &pPatchRec->Core);
391	Assert(ret);
392	if (pPatchRec->patch.uState != PATCH_REFUSED)
393	{
394	if (pPatchRec->patch.pPatchBlockOffset)
395	{
396	/* We actually generated code for this patch. */
397	ret = RTAvloGCPtrInsert(&pVM->patm.s.PatchLookupTreeHC->PatchTreeByPatchAddr, &pPatchRec->CoreOffset);
398	AssertMsg(ret, ("Inserting patch %VGv offset %VGv failed!!\n", pPatchRec->patch.pPrivInstrGC, pPatchRec->CoreOffset.Key));
399	}
400	}
401	/* Set to zero as we don't need it anymore. */
402	pPatchRec->patch.pTempInfo = 0;
403
404	pPatchRec->patch.pPrivInstrHC = 0;
405	/* The GC virtual ptr is fixed, but we must convert it manually again to HC. */
406	rc = PGMPhysGCPtr2HCPtr(pVM, pPatchRec->patch.pPrivInstrGC, (PRTHCPTR)&pPatchRec->patch.pPrivInstrHC);
407	/* Can fail due to page or page table not present. */
408
409	/*
410	* Restore fixup records and correct HC pointers in fixup records
411	*/
412	pPatchRec->patch.FixupTree = 0;
413	pPatchRec->patch.nrFixups = 0; /* increased by patmPatchAddReloc32 */
414	for (int i=0;i<patch.patch.nrFixups;i++)
415	{
416	RELOCREC rec;
417
418	rc = SSMR3GetMem(pSSM, &rec, sizeof(rec));
419	AssertRCReturn(rc, rc);
420	PATM_ADD_PTR(rec.pRelocPos, pVM->patm.s.pPatchMemHC);
421
422	rc = patmPatchAddReloc32(pVM, &pPatchRec->patch, rec.pRelocPos, rec.uType, rec.pSource, rec.pDest);
423	AssertRCReturn(rc, rc);
424	}
425
426	/* And all patch to guest lookup records */
427	Assert(pPatchRec->patch.nrPatch2GuestRecs \|\| pPatchRec->patch.uState == PATCH_REFUSED \|\| (pPatchRec->patch.flags & (PATMFL_SYSENTER_XP \| PATMFL_IDTHANDLER \| PATMFL_TRAPHANDLER \| PATMFL_INT3_REPLACEMENT)));
428
429	pPatchRec->patch.Patch2GuestAddrTree = 0;
430	pPatchRec->patch.Guest2PatchAddrTree = 0;
431	if (pPatchRec->patch.nrPatch2GuestRecs)
432	{
433	RECPATCHTOGUEST rec;
434	uint32_t nrPatch2GuestRecs = pPatchRec->patch.nrPatch2GuestRecs;
435
436	pPatchRec->patch.nrPatch2GuestRecs = 0; /* incremented by patmr3AddP2GLookupRecord */
437	for (uint32_t i=0;i<nrPatch2GuestRecs;i++)
438	{
439	rc = SSMR3GetMem(pSSM, &rec, sizeof(rec));
440	AssertRCReturn(rc, rc);
441
442	patmr3AddP2GLookupRecord(pVM, &pPatchRec->patch, (uintptr_t)rec.Core.Key + pVM->patm.s.pPatchMemHC, rec.pOrgInstrGC, rec.enmType, rec.fDirty);
443	}
444	Assert(pPatchRec->patch.Patch2GuestAddrTree);
445	}
446
447	if (pPatchRec->patch.flags & PATMFL_CODE_MONITORED)
448	{
449	/* Insert the guest page lookup records (for detection self-modifying code) */
450	rc = patmInsertPatchPages(pVM, &pPatchRec->patch);
451	AssertRCReturn(rc, rc);
452	}
453	}
454
455	#ifdef VBOX_WITH_STATISTICS
456	/*
457	* Restore relevant old statistics
458	*/
459	pVM->patm.s.StatDisabled = patmInfo.StatDisabled;
460	pVM->patm.s.StatUnusable = patmInfo.StatUnusable;
461	pVM->patm.s.StatEnabled = patmInfo.StatEnabled;
462	pVM->patm.s.StatInstalled = patmInfo.StatInstalled;
463	#endif
464	return VINF_SUCCESS;
465	}
466
467

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source: vbox/trunk/src/VBox/VMM/PATM/PATMSSM.cpp@ 1284

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