CSAM.cpp@ 347

Last change on this file since 347 was 347, checked in by vboxsync, 18 years ago
Rewrote and simplified interrupt handler patching.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 83.5 KB

Line
1	/* $Id: CSAM.cpp 347 2007-01-26 09:36:22Z vboxsync $ */
2	/** @file
3	* CSAM - Guest OS Code Scanning and Analysis Manager
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_CSAM
26	#include <VBox/cpum.h>
27	#include <VBox/stam.h>
28	#include <VBox/patm.h>
29	#include <VBox/csam.h>
30	#include <VBox/pgm.h>
31	#include <VBox/iom.h>
32	#include <VBox/sup.h>
33	#include <VBox/mm.h>
34	#include <VBox/em.h>
35	#include <VBox/rem.h>
36	#include <VBox/selm.h>
37	#include <VBox/trpm.h>
38	#include <VBox/param.h>
39	#include <iprt/avl.h>
40	#include <iprt/asm.h>
41	#include <iprt/thread.h>
42	#include "CSAMInternal.h"
43	#include <VBox/vm.h>
44	#include <VBox/dbg.h>
45	#include <VBox/err.h>
46	#include <VBox/ssm.h>
47	#include <VBox/log.h>
48	#include <iprt/assert.h>
49	#include <iprt/string.h>
50	#include <VBox/dis.h>
51	#include <VBox/disopcode.h>
52	#include <stdlib.h>
53	#include <stdio.h>
54
55
56	/* Enabled by default */
57	#define CSAM_ENABLE
58
59	/* Enable to monitor code pages for self-modifying code. */
60	#define CSAM_MONITOR_CODE_PAGES
61	/* Enable to monitor all scanned pages
62	#define CSAM_MONITOR_CSAM_CODE_PAGES */
63
64	/*******************************************************************************
65	* Internal Functions *
66	*******************************************************************************/
67	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM);
68	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
69	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
70	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr);
71
72	bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage);
73	int csamR3FlushPageRecord(PVM pVM, PCSAMPAGE pPage);
74	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstr);
75	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
76	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr);
77	static int csamReinit(PVM pVM);
78	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned);
79	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
80	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec);
81
82	/** @todo Temporary for debugging. */
83	static bool fInCSAMCodePageInvalidate = false;
84
85	/*******************************************************************************
86	* Global Variables *
87	*******************************************************************************/
88	#ifdef VBOX_WITH_DEBUGGER
89	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
90	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
91
92	/** Command descriptors. */
93	static const DBGCCMD g_aCmds[] =
94	{
95	/* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, pResultDesc, fFlags, pfnHandler pszSyntax, ....pszDescription */
96	{ "csamon", 0, 0, NULL, 0, NULL, 0, csamr3CmdOn, "", "Enable CSAM code scanning." },
97	{ "csamoff", 0, 0, NULL, 0, NULL, 0, csamr3CmdOff, "", "Disable CSAM code scanning." },
98	};
99	#endif
100
101
102	/**
103	* Initializes the CSAM.
104	*
105	* @returns VBox status code.
106	* @param pVM The VM to operate on.
107	*/
108	CSAMR3DECL(int) CSAMR3Init(PVM pVM)
109	{
110	int rc;
111
112	LogFlow(("CSAMR3Init\n"));
113
114	/* Allocate bitmap for the page directory. */
115	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTHCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDBitmapHC);
116	AssertRCReturn(rc, rc);
117	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTGCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDGCBitmapHC);
118	AssertRCReturn(rc, rc);
119	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
120	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
121
122	rc = csamReinit(pVM);
123	AssertRCReturn(rc, rc);
124
125	/*
126	* Register save and load state notificators.
127	*/
128	rc = SSMR3RegisterInternal(pVM, "CSAM", 0, CSAM_SSM_VERSION, sizeof(pVM->csam.s) + PAGE_SIZE*16,
129	NULL, csamr3Save, NULL,
130	NULL, csamr3Load, NULL);
131	AssertRCReturn(rc, rc);
132
133	STAM_REG(pVM, &pVM->csam.s.StatNrTraps, STAMTYPE_COUNTER, "/CSAM/PageTraps", STAMUNIT_OCCURENCES, "The number of CSAM page traps.");
134	STAM_REG(pVM, &pVM->csam.s.StatDangerousWrite, STAMTYPE_COUNTER, "/CSAM/DangerousWrites", STAMUNIT_OCCURENCES, "The number of dangerous writes that cause a context switch.");
135
136	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPHC, STAMTYPE_COUNTER, "/CSAM/HC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
137	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPGC, STAMTYPE_COUNTER, "/CSAM/GC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
138	STAM_REG(pVM, &pVM->csam.s.StatNrPages, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRW", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW monitoring).");
139	STAM_REG(pVM, &pVM->csam.s.StatNrPagesInv, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRWI", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW & invalidation monitoring).");
140	STAM_REG(pVM, &pVM->csam.s.StatNrRemovedPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Removed", STAMUNIT_OCCURENCES, "The number of removed CSAM page records.");
141	STAM_REG(pVM, &pVM->csam.s.StatPageRemoveREMFlush,STAMTYPE_COUNTER, "/CSAM/PageRec/Removed/REMFlush", STAMUNIT_OCCURENCES, "The number of removed CSAM page records that caused a REM flush.");
142
143	STAM_REG(pVM, &pVM->csam.s.StatNrPatchPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Patch", STAMUNIT_OCCURENCES, "The number of CSAM patch page records.");
144	STAM_REG(pVM, &pVM->csam.s.StatNrUserPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Ignore/User", STAMUNIT_OCCURENCES, "The number of CSAM user page records (ignored).");
145	STAM_REG(pVM, &pVM->csam.s.StatPagePATM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/PATM", STAMUNIT_OCCURENCES, "The number of PATM page records.");
146	STAM_REG(pVM, &pVM->csam.s.StatPageCSAM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/CSAM", STAMUNIT_OCCURENCES, "The number of CSAM page records.");
147	STAM_REG(pVM, &pVM->csam.s.StatPageREM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/REM", STAMUNIT_OCCURENCES, "The number of REM page records.");
148	STAM_REG(pVM, &pVM->csam.s.StatPageMonitor, STAMTYPE_COUNTER, "/CSAM/PageRec/Monitored", STAMUNIT_OCCURENCES, "The number of monitored pages.");
149
150	STAM_REG(pVM, &pVM->csam.s.StatCodePageModified, STAMTYPE_COUNTER, "/CSAM/Monitor/DirtyPage", STAMUNIT_OCCURENCES, "The number of code page modifications.");
151
152	STAM_REG(pVM, &pVM->csam.s.StatNrFlushes, STAMTYPE_COUNTER, "/CSAM/PageFlushes", STAMUNIT_OCCURENCES, "The number of CSAM page flushes.");
153	STAM_REG(pVM, &pVM->csam.s.StatNrFlushesSkipped, STAMTYPE_COUNTER, "/CSAM/PageFlushesSkipped", STAMUNIT_OCCURENCES, "The number of CSAM page flushes that were skipped.");
154	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesHC, STAMTYPE_COUNTER, "/CSAM/HC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
155	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesGC, STAMTYPE_COUNTER, "/CSAM/GC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
156	STAM_REG(pVM, &pVM->csam.s.StatNrInstr, STAMTYPE_COUNTER, "/CSAM/ScannedInstr", STAMUNIT_OCCURENCES, "The number of scanned instructions.");
157	STAM_REG(pVM, &pVM->csam.s.StatNrBytesRead, STAMTYPE_COUNTER, "/CSAM/BytesRead", STAMUNIT_OCCURENCES, "The number of bytes read for scanning.");
158	STAM_REG(pVM, &pVM->csam.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/CSAM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
159
160	STAM_REG(pVM, &pVM->csam.s.StatBitmapAlloc, STAMTYPE_COUNTER, "/CSAM/Alloc/PageBitmap", STAMUNIT_OCCURENCES, "The number of page bitmap allocations.");
161
162	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheHit, STAMTYPE_COUNTER, "/CSAM/Cache/Hit", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache hits.");
163	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheMiss, STAMTYPE_COUNTER, "/CSAM/Cache/Miss", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache misses.");
164
165	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunction, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Success", STAMUNIT_OCCURENCES, "The number of found functions beyond the ret border.");
166	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunctionFailed, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Failed", STAMUNIT_OCCURENCES, "The number of refused functions beyond the ret border.");
167
168	STAM_REG(pVM, &pVM->csam.s.StatTime, STAMTYPE_PROFILE, "/PROF/CSAM/Scan", STAMUNIT_TICKS_PER_CALL, "Scanning overhead.");
169	STAM_REG(pVM, &pVM->csam.s.StatTimeCheckAddr, STAMTYPE_PROFILE, "/PROF/CSAM/CheckAddr", STAMUNIT_TICKS_PER_CALL, "Address check overhead.");
170	STAM_REG(pVM, &pVM->csam.s.StatTimeAddrConv, STAMTYPE_PROFILE, "/PROF/CSAM/AddrConv", STAMUNIT_TICKS_PER_CALL, "Address conversion overhead.");
171	STAM_REG(pVM, &pVM->csam.s.StatTimeFlushPage, STAMTYPE_PROFILE, "/PROF/CSAM/FlushPage", STAMUNIT_TICKS_PER_CALL, "Page flushing overhead.");
172	STAM_REG(pVM, &pVM->csam.s.StatTimeDisasm, STAMTYPE_PROFILE, "/PROF/CSAM/Disasm", STAMUNIT_TICKS_PER_CALL, "Disassembly overhead.");
173	STAM_REG(pVM, &pVM->csam.s.StatFlushDirtyPages, STAMTYPE_PROFILE, "/PROF/CSAM/FlushDirtyPage", STAMUNIT_TICKS_PER_CALL, "Dirty page flushing overhead.");
174	STAM_REG(pVM, &pVM->csam.s.StatCheckGates, STAMTYPE_PROFILE, "/PROF/CSAM/CheckGates", STAMUNIT_TICKS_PER_CALL, "CSAMR3CheckGates overhead.");
175
176
177	#ifdef CSAM_ENABLE
178	CSAMEnableScanning(pVM);
179	#endif
180
181	#ifdef VBOX_WITH_DEBUGGER
182	/*
183	* Debugger commands.
184	*/
185	static bool fRegisteredCmds = false;
186	if (!fRegisteredCmds)
187	{
188	int rc = DBGCRegisterCommands(&g_aCmds[0], ELEMENTS(g_aCmds));
189	if (VBOX_SUCCESS(rc))
190	fRegisteredCmds = true;
191	}
192	#endif
193
194	return VINF_SUCCESS;
195	}
196
197	/**
198	* (Re)initializes CSAM
199	*
200	* @param pVM The VM.
201	*/
202	static int csamReinit(PVM pVM)
203	{
204	/*
205	* Assert alignment and sizes.
206	*/
207	AssertRelease(!(RT_OFFSETOF(VM, csam.s) & 31));
208	AssertRelease(sizeof(pVM->csam.s) <= sizeof(pVM->csam.padding));
209
210	/*
211	* Setup any fixed pointers and offsets.
212	*/
213	pVM->csam.s.offVM = RT_OFFSETOF(VM, patm);
214
215	pVM->csam.s.fGatesChecked = false;
216	pVM->csam.s.fScanningStarted = false;
217
218	VM_FF_CLEAR(pVM, VM_FF_CSAM_FLUSH_DIRTY_PAGE);
219	pVM->csam.s.cDirtyPages = 0;
220	/* not necessary */
221	memset(pVM->csam.s.pvDirtyBasePage, 0, sizeof(pVM->csam.s.pvDirtyBasePage));
222	memset(pVM->csam.s.pvDirtyFaultPage, 0, sizeof(pVM->csam.s.pvDirtyFaultPage));
223
224	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
225	pVM->csam.s.cDangerousInstr = 0;
226	pVM->csam.s.iDangerousInstr = 0;
227
228	/** @note never mess with the pgdir bitmap here! */
229	return VINF_SUCCESS;
230	}
231
232	/**
233	* Applies relocations to data and code managed by this
234	* component. This function will be called at init and
235	* whenever the VMM need to relocate itself inside the GC.
236	*
237	* The csam will update the addresses used by the switcher.
238	*
239	* @param pVM The VM.
240	* @param offDelta Relocation delta.
241	*/
242	CSAMR3DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
243	{
244	if (offDelta)
245	{
246	/* Adjust pgdir and page bitmap pointers. */
247	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
248	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
249
250	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
251	{
252	if (pVM->csam.s.pPDGCBitmapHC[i])
253	{
254	pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
255	}
256	}
257	}
258	return;
259	}
260
261	/**
262	* Terminates the csam.
263	*
264	* Termination means cleaning up and freeing all resources,
265	* the VM it self is at this point powered off or suspended.
266	*
267	* @returns VBox status code.
268	* @param pVM The VM to operate on.
269	*/
270	CSAMR3DECL(int) CSAMR3Term(PVM pVM)
271	{
272	int rc;
273
274	rc = CSAMR3Reset(pVM);
275	AssertRC(rc);
276
277	/* @todo triggers assertion in MMHyperFree */
278	#if 0
279	for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
280	{
281	if (pVM->csam.s.pPDBitmapHC[i])
282	MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
283	}
284	#endif
285
286	return VINF_SUCCESS;
287	}
288
289	/**
290	* CSAM reset callback.
291	*
292	* @returns VBox status code.
293	* @param pVM The VM which is reset.
294	*/
295	CSAMR3DECL(int) CSAMR3Reset(PVM pVM)
296	{
297	/* Clear page bitmaps. */
298	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
299	{
300	if (pVM->csam.s.pPDBitmapHC[i])
301	{
302	Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
303	ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
304	}
305	}
306
307	/* Remove all CSAM page records. */
308	while(true)
309	{
310	PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
311	if (pPageRec)
312	{
313	csamRemovePageRecord(pVM, pPageRec->page.pPageGC);
314	}
315	else
316	break;
317	}
318	Assert(!pVM->csam.s.pPageTree);
319
320	csamReinit(pVM);
321
322	return VINF_SUCCESS;
323	}
324
325	#define CSAM_SUBTRACT_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) - (uintptr_t)(b)
326	#define CSAM_ADD_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) + (uintptr_t)(b)
327
328
329	/**
330	* Callback function for RTAvlPVDoWithAll
331	*
332	* Counts the number of records in the tree
333	*
334	* @returns VBox status code.
335	* @param pNode Current node
336	* @param pcPatches Pointer to patch counter
337	*/
338	static DECLCALLBACK(int) CountRecord(PAVLPVNODECORE pNode, void *pcPatches)
339	{
340	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
341	return VINF_SUCCESS;
342	}
343
344	/**
345	* Callback function for RTAvlPVDoWithAll
346	*
347	* Saves the state of the page record
348	*
349	* @returns VBox status code.
350	* @param pNode Current node
351	* @param pVM1 VM Handle
352	*/
353	static DECLCALLBACK(int) SavePageState(PAVLPVNODECORE pNode, void *pVM1)
354	{
355	PVM pVM = (PVM)pVM1;
356	PCSAMPAGEREC pPage = (PCSAMPAGEREC)pNode;
357	CSAMPAGEREC page = *pPage;
358	PSSMHANDLE pSSM = pVM->csam.s.savedstate.pSSM;
359	int rc;
360
361	/* Save the page record itself */
362	rc = SSMR3PutMem(pSSM, &page, sizeof(page));
363	AssertRCReturn(rc, rc);
364
365	if (page.page.pBitmap)
366	{
367	rc = SSMR3PutMem(pSSM, page.page.pBitmap, CSAM_PAGE_BITMAP_SIZE);
368	AssertRCReturn(rc, rc);
369	}
370
371	return VINF_SUCCESS;
372	}
373
374	/**
375	* Execute state save operation.
376	*
377	* @returns VBox status code.
378	* @param pVM VM Handle.
379	* @param pSSM SSM operation handle.
380	*/
381	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM)
382	{
383	CSAM csamInfo = pVM->csam.s;
384	int rc;
385
386	/*
387	* Count the number of page records in the tree (feeling lazy)
388	*/
389	csamInfo.savedstate.cPageRecords = 0;
390	RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, CountRecord, &csamInfo.savedstate.cPageRecords);
391
392	/*
393	* Save CSAM structure
394	*/
395	pVM->csam.s.savedstate.pSSM = pSSM;
396	rc = SSMR3PutMem(pSSM, &csamInfo, sizeof(csamInfo));
397	AssertRCReturn(rc, rc);
398
399	/* Save pgdir bitmap */
400	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
401	AssertRCReturn(rc, rc);
402
403	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
404	{
405	if(csamInfo.pPDBitmapHC[i])
406	{
407	/* Save the page bitmap. */
408	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
409	AssertRCReturn(rc, rc);
410	}
411	}
412
413	/*
414	* Save page records
415	*/
416	rc = RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, SavePageState, pVM);
417	AssertRCReturn(rc, rc);
418
419	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
420	return VINF_SUCCESS;
421	}
422
423	/**
424	* Execute state load operation.
425	*
426	* @returns VBox status code.
427	* @param pVM VM Handle.
428	* @param pSSM SSM operation handle.
429	* @param u32Version Data layout version.
430	*/
431	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
432	{
433	int rc;
434	CSAM csamInfo;
435
436	if (u32Version != CSAM_SSM_VERSION)
437	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
438
439	pVM->csam.s.savedstate.pSSM = pSSM;
440
441	/*
442	* Restore CSAM structure
443	*/
444	rc = SSMR3GetMem(pSSM, &csamInfo, sizeof(csamInfo));
445	AssertRCReturn(rc, rc);
446
447	pVM->csam.s.fGatesChecked = csamInfo.fGatesChecked;
448	pVM->csam.s.fScanningStarted = csamInfo.fScanningStarted;
449
450	/* Restore dirty code page info. */
451	pVM->csam.s.cDirtyPages = csamInfo.cDirtyPages;
452	memcpy(pVM->csam.s.pvDirtyBasePage, csamInfo.pvDirtyBasePage, sizeof(pVM->csam.s.pvDirtyBasePage));
453	memcpy(pVM->csam.s.pvDirtyFaultPage, csamInfo.pvDirtyFaultPage, sizeof(pVM->csam.s.pvDirtyFaultPage));
454
455	/* Restore pgdir bitmap (we'll change the pointers next). */
456	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
457	AssertRCReturn(rc, rc);
458
459	/*
460	* Restore page bitmaps
461	*/
462	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
463	{
464	if(pVM->csam.s.pPDBitmapHC[i])
465	{
466	rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC[i]);
467	if (VBOX_FAILURE(rc))
468	{
469	Log(("MMR3HyperAlloc failed with %d\n", rc));
470	return rc;
471	}
472	/* Convert to GC pointer. */
473	pVM->csam.s.pPDGCBitmapHC[i] = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC[i]);
474	Assert(pVM->csam.s.pPDGCBitmapHC[i]);
475
476	/* Restore the bitmap. */
477	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
478	AssertRCReturn(rc, rc);
479	}
480	else
481	{
482	Assert(!pVM->csam.s.pPDGCBitmapHC[i]);
483	pVM->csam.s.pPDGCBitmapHC[i] = 0;
484	}
485	}
486
487	/*
488	* Restore page records
489	*/
490	for (uint32_t i=0;i<csamInfo.savedstate.cPageRecords + csamInfo.savedstate.cPatchPageRecords;i++)
491	{
492	CSAMPAGEREC page;
493	PCSAMPAGE pPage;
494
495	rc = SSMR3GetMem(pSSM, &page, sizeof(page));
496	AssertRCReturn(rc, rc);
497
498	/*
499	* Recreate the page record
500	*/
501	pPage = csamCreatePageRecord(pVM, page.page.pPageGC, page.page.enmTag, page.page.fCode32, page.page.fMonitorInvalidation);
502	AssertReturn(pPage, VERR_NO_MEMORY);
503
504	pPage->GCPhys = page.page.GCPhys;
505	pPage->fFlags = page.page.fFlags;
506	pPage->u64Hash = page.page.u64Hash;
507
508	if (page.page.pBitmap)
509	{
510	rc = SSMR3GetMem(pSSM, pPage->pBitmap, CSAM_PAGE_BITMAP_SIZE);
511	AssertRCReturn(rc, rc);
512	}
513	else
514	{
515	MMR3HeapFree(pPage->pBitmap);
516	pPage->pBitmap = 0;
517	}
518	}
519
520	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
521	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
522	pVM->csam.s.cDangerousInstr = 0;
523	pVM->csam.s.iDangerousInstr = 0;
524	return VINF_SUCCESS;
525	}
526
527	/**
528	* Convert guest context address to host context pointer
529	*
530	* @returns VBox status code.
531	* @param pVM The VM to operate on.
532	* @param pCacheRec Address conversion cache record
533	* @param pGCPtr Guest context pointer
534	*
535	* @returns Host context pointer or NULL in case of an error
536	*
537	*/
538	static HCPTRTYPE(void ) CSAMGCVirtToHCVirt(PVM pVM, PCSAMP2GLOOKUPREC pCacheRec, GCPTRTYPE(uint8_t )pGCPtr)
539	{
540	int rc;
541	HCPTRTYPE(void *)pHCPtr;
542
543	STAM_PROFILE_START(&pVM->csam.s.StatTimeAddrConv, a);
544
545	pHCPtr = PATMR3GCPtrToHCPtr(pVM, pGCPtr);
546	if (pHCPtr) return pHCPtr;
547
548	if (pCacheRec->pPageLocStartHC)
549	{
550	uint32_t offset = pGCPtr & PAGE_OFFSET_MASK;
551	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
552	{
553	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
554	return pCacheRec->pPageLocStartHC + offset;
555	}
556	}
557
558	rc = PGMPhysGCPtr2HCPtr(pVM, pGCPtr, &pHCPtr);
559	if (rc != VINF_SUCCESS)
560	{
561	//// AssertMsgRC(rc, ("MMR3PhysGCVirt2HCVirtEx failed for %VGv\n", pGCPtr));
562	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
563	return NULL;
564	}
565	Assert(sizeof(HCPTRTYPE(uint8_t*)) == sizeof(uint32_t));
566
567	pCacheRec->pPageLocStartHC = (HCPTRTYPE(uint8_t*))((RTHCUINTPTR)pHCPtr & PAGE_BASE_HC_MASK);
568	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
569	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
570	return pHCPtr;
571	}
572
573	/**
574	* Read callback for disassembly function; supports reading bytes that cross a page boundary
575	*
576	* @returns VBox status code.
577	* @param pSrc GC source pointer
578	* @param pDest HC destination pointer
579	* @param size Number of bytes to read
580	* @param dwUserdata Callback specific user data (pCpu)
581	*
582	*/
583	int32_t CSAMR3ReadBytes(RTHCUINTPTR pSrc, uint8_t *pDest, uint32_t size, RTHCUINTPTR dwUserdata)
584	{
585	DISCPUSTATE pCpu = (DISCPUSTATE )dwUserdata;
586	PVM pVM = (PVM)pCpu->dwUserData[0];
587	RTHCUINTPTR pInstrHC = pCpu->dwUserData[1];
588	RTGCUINTPTR pInstrGC = pCpu->dwUserData[2];
589	int orgsize = size;
590
591	Assert(sizeof(RTHCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
592	Assert(sizeof(RTGCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
593
594	/* We are not interested in patched instructions, so read the original opcode bytes. */
595	/** @note single instruction patches (int3) are checked in CSAMR3AnalyseCallback */
596	for (int i=0;i<orgsize;i++)
597	{
598	int rc = PATMR3QueryOpcode(pVM, (RTGCPTR)pSrc, pDest);
599	if (VBOX_SUCCESS(rc))
600	{
601	pSrc++;
602	pDest++;
603	size--;
604	}
605	else
606	break;
607	}
608	if (size == 0)
609	return VINF_SUCCESS;
610
611	if (PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pSrc + size - 1) && !PATMIsPatchGCAddr(pVM, pSrc))
612	{
613	return PGMPhysReadGCPtr(pVM, pDest, pSrc, size);
614	}
615	else
616	{
617	Assert(pInstrHC);
618
619	/* pInstrHC is the base address; adjust according to the GC pointer. */
620	pInstrHC = pInstrHC + (pSrc - pInstrGC);
621
622	memcpy(pDest, (void *)pInstrHC, size);
623	}
624
625	return VINF_SUCCESS;
626	}
627
628	inline bool CSAMR3DISInstr(PVM pVM, DISCPUSTATE pCpu, RTGCPTR InstrGC, uint8_t InstrHC, uint32_t pOpsize, char pszOutput)
629	{
630	(pCpu)->pfnReadBytes = CSAMR3ReadBytes;
631	(pCpu)->dwUserData[0] = (RTHCUINTPTR)pVM;
632	(pCpu)->dwUserData[1] = (RTHCUINTPTR)InstrHC;
633	(pCpu)->dwUserData[2] = (RTHCUINTPTR)InstrGC;
634	#ifdef DEBUG
635	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, OPTYPE_ALL);
636	#else
637	/* We are interested in everything except harmless stuff */
638	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, ~(OPTYPE_INVALID \| OPTYPE_HARMLESS \| OPTYPE_RRM_MASK));
639	#endif
640	}
641
642	/**
643	* Analyses the instructions following the cli for compliance with our heuristics for cli
644	*
645	* @returns VBox status code.
646	* @param pVM The VM to operate on.
647	* @param pCpu CPU disassembly state
648	* @param pInstrGC Guest context pointer to privileged instruction
649	* @param pCurInstrGC Guest context pointer to the current instruction
650	* @param pCacheRec GC to HC cache record
651	* @param pUserData User pointer (callback specific)
652	*
653	*/
654	static int CSAMR3AnalyseCallback(PVM pVM, DISCPUSTATE pCpu, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t *) pCurInstrGC,
655	PCSAMP2GLOOKUPREC pCacheRec, void *pUserData)
656	{
657	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
658	int rc;
659
660	switch(pCpu->pCurInstr->opcode)
661	{
662	case OP_INT:
663	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
664	if (pCpu->param1.parval == 3)
665	{
666	//two byte int 3
667	return VINF_SUCCESS;
668	}
669	break;
670
671	case OP_ILLUD2:
672	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue. */
673	case OP_RETN:
674	case OP_INT3:
675	case OP_INVALID:
676	#if 1
677	/* removing breaks win2k guests? */
678	case OP_IRET:
679	#endif
680	return VINF_SUCCESS;
681	}
682
683	// Check for exit points
684	switch (pCpu->pCurInstr->opcode)
685	{
686	/* It's not a good idea to patch pushf instructions:
687	* - increases the chance of conflicts (code jumping to the next instruction)
688	* - better to patch the cli
689	* - code that branches before the cli will likely hit an int 3
690	* - in general doesn't offer any benefits as we don't allow nested patch blocks (IF is always 1)
691	*/
692	case OP_PUSHF:
693	case OP_POPF:
694	break;
695
696	case OP_CLI:
697	{
698	uint32_t cbInstr = 0;
699	uint32_t opsize = pCpu->opsize;
700
701	PATMR3AddHint(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
702
703	/* Make sure the instructions that follow the cli have not been encountered before. */
704	while (true)
705	{
706	DISCPUSTATE cpu;
707	uint8_t *pCurInstrHC = 0;
708	bool disret;
709
710	if (cbInstr + opsize >= SIZEOF_NEARJUMP32)
711	break;
712
713	if (csamIsCodeScanned(pVM, pCurInstrGC + opsize, &pPage) == true)
714	{
715	/* We've scanned the next instruction(s) already. This means we've followed a branch that ended up there before -> dangerous!! */
716	PATMR3DetectConflict(pVM, pCurInstrGC, pCurInstrGC + opsize);
717	break;
718	}
719	pCurInstrGC += opsize;
720	cbInstr += opsize;
721
722	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
723	if (pCurInstrHC == NULL)
724	{
725	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
726	break;
727	}
728	Assert(VALID_PTR(pCurInstrHC));
729
730	cpu.mode = (pPage->fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
731	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
732	Assert(disret == true);
733	if (disret == false)
734	break;
735	}
736	break;
737	}
738
739	case OP_PUSH:
740	if (pCpu->pCurInstr->param1 != OP_PARM_REG_CS)
741	break;
742
743	/* no break */
744	case OP_STR:
745	case OP_LSL:
746	case OP_LAR:
747	case OP_SGDT:
748	case OP_SLDT:
749	case OP_SIDT:
750	case OP_SMSW:
751	case OP_VERW:
752	case OP_VERR:
753	case OP_CPUID:
754	case OP_IRET:
755	#ifdef DEBUG
756	switch(pCpu->pCurInstr->opcode)
757	{
758	case OP_STR:
759	Log(("Privileged instruction at %VGv: str!!\n", pCurInstrGC));
760	break;
761	case OP_LSL:
762	Log(("Privileged instruction at %VGv: lsl!!\n", pCurInstrGC));
763	break;
764	case OP_LAR:
765	Log(("Privileged instruction at %VGv: lar!!\n", pCurInstrGC));
766	break;
767	case OP_SGDT:
768	Log(("Privileged instruction at %VGv: sgdt!!\n", pCurInstrGC));
769	break;
770	case OP_SLDT:
771	Log(("Privileged instruction at %VGv: sldt!!\n", pCurInstrGC));
772	break;
773	case OP_SIDT:
774	Log(("Privileged instruction at %VGv: sidt!!\n", pCurInstrGC));
775	break;
776	case OP_SMSW:
777	Log(("Privileged instruction at %VGv: smsw!!\n", pCurInstrGC));
778	break;
779	case OP_VERW:
780	Log(("Privileged instruction at %VGv: verw!!\n", pCurInstrGC));
781	break;
782	case OP_VERR:
783	Log(("Privileged instruction at %VGv: verr!!\n", pCurInstrGC));
784	break;
785	case OP_CPUID:
786	Log(("Privileged instruction at %VGv: cpuid!!\n", pCurInstrGC));
787	break;
788	case OP_PUSH:
789	Log(("Privileged instruction at %VGv: push cs!!\n", pCurInstrGC));
790	break;
791	case OP_IRET:
792	Log(("Privileged instruction at %VGv: iret!!\n", pCurInstrGC));
793	break;
794	}
795	#endif
796
797	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
798	{
799	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
800	if (VBOX_FAILURE(rc))
801	{
802	Log(("PATMR3InstallPatch failed with %d\n", rc));
803	return VWRN_CONTINUE_ANALYSIS;
804	}
805	}
806	if (pCpu->pCurInstr->opcode == OP_IRET)
807	return VINF_SUCCESS; /* Look no further in this branch. */
808
809	return VWRN_CONTINUE_ANALYSIS;
810
811	case OP_JMP:
812	case OP_CALL:
813	{
814	// return or jump/call through a jump table
815	if (OP_PARM_VTYPE(pCpu->pCurInstr->param1) != OP_PARM_J)
816	{
817	#ifdef DEBUG
818	switch(pCpu->pCurInstr->opcode)
819	{
820	case OP_JMP:
821	Log(("Control Flow instruction at %VGv: jmp!!\n", pCurInstrGC));
822	break;
823	case OP_CALL:
824	Log(("Control Flow instruction at %VGv: call!!\n", pCurInstrGC));
825	break;
826	}
827	#endif
828	return VWRN_CONTINUE_ANALYSIS;
829	}
830	return VWRN_CONTINUE_ANALYSIS;
831	}
832
833	}
834
835	return VWRN_CONTINUE_ANALYSIS;
836	}
837
838	#ifdef CSAM_ANALYSE_BEYOND_RET
839	/**
840	* Wrapper for csamAnalyseCodeStream for call instructions.
841	*
842	* @returns VBox status code.
843	* @param pVM The VM to operate on.
844	* @param pInstrGC Guest context pointer to privileged instruction
845	* @param pCurInstrGC Guest context pointer to the current instruction
846	* @param fCode32 16 or 32 bits code
847	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
848	* @param pUserData User pointer (callback specific)
849	*
850	*/
851	static int csamAnalyseCallCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
852	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
853	{
854	int rc;
855	CSAMCALLEXITREC CallExitRec;
856	PCSAMCALLEXITREC pOldCallRec;
857	PCSAMPAGE pPage = 0;
858	uint32_t i;
859
860	CallExitRec.cInstrAfterRet = 0;
861
862	pOldCallRec = pCacheRec->pCallExitRec;
863	pCacheRec->pCallExitRec = &CallExitRec;
864
865	rc = csamAnalyseCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
866
867	for (i=0;i<CallExitRec.cInstrAfterRet;i++)
868	{
869	PCSAMPAGE pPage = 0;
870
871	pCurInstrGC = CallExitRec.pInstrAfterRetGC[i];
872
873	/* Check if we've previously encountered the instruction after the ret. */
874	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
875	{
876	DISCPUSTATE cpu;
877	uint32_t opsize;
878	uint8_t *pCurInstrHC = 0;
879	bool disret;
880	#ifdef DEBUG
881	char szOutput[256];
882	#endif
883	if (pPage == NULL)
884	{
885	/* New address; let's take a look at it. */
886	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
887	if (pPage == NULL)
888	{
889	rc = VERR_NO_MEMORY;
890	goto done;
891	}
892	}
893
894	/**
895	* Some generic requirements for recognizing an adjacent function:
896	* - alignment fillers that consist of:
897	* - nop
898	* - lea genregX, [genregX (+ 0)]
899	* - push ebp after the filler (can extend this later); aligned at at least a 4 byte boundary
900	*/
901	for (int j=0;j<16;j++)
902	{
903	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
904	if (pCurInstrHC == NULL)
905	{
906	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
907	goto done;
908	}
909	Assert(VALID_PTR(pCurInstrHC));
910
911	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
912	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
913	#ifdef DEBUG
914	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
915	if (disret == true) Log(("CSAM Call Analysis: %s", szOutput));
916	#else
917	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
918	#endif
919	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
920	if (disret == false)
921	{
922	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
923	goto done;
924	}
925
926	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
927
928	GCPTRTYPE(uint8_t *) addr = 0;
929	PCSAMPAGE pJmpPage = NULL;
930
931	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
932	{
933	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
934	{
935	/// @todo fault in the page
936	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
937	goto done;
938	}
939	//all is fine, let's continue
940	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
941	}
942
943	switch (cpu.pCurInstr->opcode)
944	{
945	case OP_NOP:
946	break; /* acceptable */
947
948	case OP_LEA:
949	/* Must be similar to:
950	*
951	* lea esi, [esi]
952	* lea esi, [esi+0]
953	* Any register is allowed as long as source and destination are identical.
954	*/
955	if ( cpu.param1.flags != USE_REG_GEN32
956	\|\| ( cpu.param2.flags != USE_REG_GEN32
957	&& ( !(cpu.param2.flags & USE_REG_GEN32)
958	\|\| !(cpu.param2.flags & (USE_DISPLACEMENT8\|USE_DISPLACEMENT16\|USE_DISPLACEMENT32))
959	\|\| cpu.param2.parval != 0
960	)
961	)
962	\|\| cpu.param1.base.reg_gen32 != cpu.param2.base.reg_gen32
963	)
964	{
965	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
966	goto next_function;
967	}
968	break;
969
970	case OP_PUSH:
971	{
972	if ( (pCurInstrGC & 0x3) != 0
973	\|\| cpu.param1.flags != USE_REG_GEN32
974	\|\| cpu.param1.base.reg_gen32 != USE_REG_EBP
975	)
976	{
977	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
978	goto next_function;
979	}
980
981	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
982	{
983	CSAMCALLEXITREC CallExitRec2;
984	CallExitRec2.cInstrAfterRet = 0;
985
986	pCacheRec->pCallExitRec = &CallExitRec2;
987
988	/* Analyse the function. */
989	Log(("Found new function at %VGv\n", pCurInstrGC));
990	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
991	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
992	}
993	goto next_function;
994	}
995
996	case OP_SUB:
997	{
998	if ( (pCurInstrGC & 0x3) != 0
999	\|\| cpu.param1.flags != USE_REG_GEN32
1000	\|\| cpu.param1.base.reg_gen32 != USE_REG_ESP
1001	)
1002	{
1003	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1004	goto next_function;
1005	}
1006
1007	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1008	{
1009	CSAMCALLEXITREC CallExitRec2;
1010	CallExitRec2.cInstrAfterRet = 0;
1011
1012	pCacheRec->pCallExitRec = &CallExitRec2;
1013
1014	/* Analyse the function. */
1015	Log(("Found new function at %VGv\n", pCurInstrGC));
1016	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1017	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1018	}
1019	goto next_function;
1020	}
1021
1022	default:
1023	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1024	goto next_function;
1025	}
1026	/* Mark it as scanned. */
1027	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1028	pCurInstrGC += opsize;
1029	} /* for at most 16 instructions */
1030	next_function:
1031	; /* MSVC complains otherwise */
1032	}
1033	}
1034	done:
1035	pCacheRec->pCallExitRec = pOldCallRec;
1036	return rc;
1037	}
1038	#else
1039	#define csamAnalyseCallCodeStream csamAnalyseCodeStream
1040	#endif
1041
1042	/**
1043	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
1044	*
1045	* @returns VBox status code.
1046	* @param pVM The VM to operate on.
1047	* @param pInstrGC Guest context pointer to privileged instruction
1048	* @param pCurInstrGC Guest context pointer to the current instruction
1049	* @param fCode32 16 or 32 bits code
1050	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1051	* @param pUserData User pointer (callback specific)
1052	*
1053	*/
1054	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1055	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1056	{
1057	DISCPUSTATE cpu;
1058	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
1059	int rc = VWRN_CONTINUE_ANALYSIS;
1060	uint32_t opsize;
1061	HCPTRTYPE(uint8_t *)pCurInstrHC = 0;
1062	bool disret;
1063
1064	#ifdef DEBUG
1065	char szOutput[256];
1066	#endif
1067
1068	LogFlow(("csamAnalyseCodeStream: code at %VGv depth=%d\n", pCurInstrGC, pCacheRec->depth));
1069
1070	pVM->csam.s.fScanningStarted = true;
1071
1072	pCacheRec->depth++;
1073	/*
1074	* Limit the call depth. (rather arbitrary upper limit; too low and we won't detect certain
1075	* cpuid instructions in Linux kernels; too high and we waste too much time scanning code)
1076	* (512 is necessary to detect cpuid instructions in Red Hat EL4; see defect 1355)
1077	* @note we are using a lot of stack here. couple of 100k when we go to the full depth (!)
1078	*/
1079	if (pCacheRec->depth > 512)
1080	{
1081	LogFlow(("CSAM: maximum calldepth reached for %VGv\n", pCurInstrGC));
1082	pCacheRec->depth--;
1083	return VINF_SUCCESS; //let's not go on forever
1084	}
1085
1086	Assert(!PATMIsPatchGCAddr(pVM, pCurInstrGC));
1087	csamR3CheckPageRecord(pVM, pCurInstrGC);
1088
1089	while(rc == VWRN_CONTINUE_ANALYSIS)
1090	{
1091	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1092	{
1093	if (pPage == NULL)
1094	{
1095	/* New address; let's take a look at it. */
1096	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1097	if (pPage == NULL)
1098	{
1099	rc = VERR_NO_MEMORY;
1100	goto done;
1101	}
1102	}
1103	}
1104	else
1105	{
1106	LogFlow(("Code at %VGv has been scanned before\n", pCurInstrGC));
1107	rc = VINF_SUCCESS;
1108	goto done;
1109	}
1110
1111	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1112	if (pCurInstrHC == NULL)
1113	{
1114	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
1115	rc = VERR_PATCHING_REFUSED;
1116	goto done;
1117	}
1118	Assert(VALID_PTR(pCurInstrHC));
1119
1120	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
1121	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1122	#ifdef DEBUG
1123	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
1124	if (disret == true) Log(("CSAM Analysis: %s", szOutput));
1125	#else
1126	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
1127	#endif
1128	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1129	if (disret == false)
1130	{
1131	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
1132	rc = VINF_SUCCESS;
1133	goto done;
1134	}
1135
1136	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
1137
1138	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1139
1140	GCPTRTYPE(uint8_t *) addr = 0;
1141	PCSAMPAGE pJmpPage = NULL;
1142
1143	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
1144	{
1145	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
1146	{
1147	/// @todo fault in the page
1148	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
1149	rc = VWRN_CONTINUE_ANALYSIS;
1150	goto next_please;
1151	}
1152	//all is fine, let's continue
1153	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
1154	}
1155	/*
1156	* If it's harmless, then don't bother checking it (the disasm tables had better be accurate!)
1157	*/
1158	if ((cpu.pCurInstr->optype & ~OPTYPE_RRM_MASK) == OPTYPE_HARMLESS)
1159	{
1160	AssertMsg(pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage) == VWRN_CONTINUE_ANALYSIS, ("Instruction incorrectly marked harmless?!?!?\n"));
1161	rc = VWRN_CONTINUE_ANALYSIS;
1162	goto next_please;
1163	}
1164
1165	#ifdef CSAM_ANALYSE_BEYOND_RET
1166	/* Remember the address of the instruction following the ret in case the parent instruction was a call. */
1167	if ( pCacheRec->pCallExitRec
1168	&& cpu.pCurInstr->opcode == OP_RETN
1169	&& pCacheRec->pCallExitRec->cInstrAfterRet < CSAM_MAX_CALLEXIT_RET)
1170	{
1171	pCacheRec->pCallExitRec->pInstrAfterRetGC[pCacheRec->pCallExitRec->cInstrAfterRet] = pCurInstrGC + opsize;
1172	pCacheRec->pCallExitRec->cInstrAfterRet++;
1173	}
1174	#endif
1175
1176	rc = pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage);
1177	if (rc == VINF_SUCCESS)
1178	goto done;
1179
1180	// For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction)
1181	if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1182	{
1183	addr = CSAMResolveBranch(&cpu, pCurInstrGC);
1184	if (addr == 0)
1185	{
1186	Log(("We don't support far jumps here!! (%08X)\n", cpu.param1.flags));
1187	rc = VINF_SUCCESS;
1188	break;
1189	}
1190	Assert(!PATMIsPatchGCAddr(pVM, addr));
1191
1192	/* If the target address lies in a patch generated jump, then special action needs to be taken. */
1193	PATMR3DetectConflict(pVM, pCurInstrGC, addr);
1194
1195	/* Same page? */
1196	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pCurInstrGC ))
1197	{
1198	if (!PGMGstIsPagePresent(pVM, addr))
1199	{
1200	Log(("Page for current instruction %VGv is not present!!\n", addr));
1201	rc = VWRN_CONTINUE_ANALYSIS;
1202	goto next_please;
1203	}
1204
1205	/* All is fine, let's continue. */
1206	csamR3CheckPageRecord(pVM, addr);
1207	}
1208
1209	pJmpPage = NULL;
1210	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1211	{
1212	if (pJmpPage == NULL)
1213	{
1214	/* New branch target; let's take a look at it. */
1215	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1216	if (pJmpPage == NULL)
1217	{
1218	rc = VERR_NO_MEMORY;
1219	goto done;
1220	}
1221	Assert(pPage);
1222	}
1223	if (cpu.pCurInstr->opcode == OP_CALL)
1224	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1225	else
1226	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1227
1228	if (rc != VINF_SUCCESS) {
1229	goto done;
1230	}
1231	}
1232	if (cpu.pCurInstr->opcode == OP_JMP)
1233	{//unconditional jump; return to caller
1234	rc = VINF_SUCCESS;
1235	goto done;
1236	}
1237
1238	rc = VWRN_CONTINUE_ANALYSIS;
1239	} //if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1240	#ifdef CSAM_SCAN_JUMP_TABLE
1241	else
1242	if ( cpu.pCurInstr->opcode == OP_JMP
1243	&& (cpu.param1.flags & (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)) == (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)
1244	)
1245	{
1246	RTGCPTR pJumpTableGC = (RTGCPTR)cpu.param1.disp32;
1247	uint8_t *pJumpTableHC;
1248	int rc2;
1249
1250	Log(("Jump through jump table\n"));
1251
1252	rc2 = PGMPhysGCPtr2HCPtr(pVM, pJumpTableGC, (PRTHCPTR)&pJumpTableHC);
1253	if (rc2 == VINF_SUCCESS)
1254	{
1255	for (uint32_t i=0;i<2;i++)
1256	{
1257	uint64_t fFlags;
1258
1259	addr = pJumpTableGC + cpu.param1.scale * i;
1260	/* Same page? */
1261	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pJumpTableGC))
1262	break;
1263
1264	addr = (RTGCPTR )(pJumpTableHC + cpu.param1.scale * i);
1265
1266	rc2 = PGMGstGetPage(pVM, addr, &fFlags, NULL);
1267	if ( rc2 != VINF_SUCCESS
1268	\|\| (fFlags & X86_PTE_US)
1269	\|\| !(fFlags & X86_PTE_P)
1270	)
1271	break;
1272
1273	Log(("Jump to %VGv\n", addr));
1274
1275	pJmpPage = NULL;
1276	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1277	{
1278	if (pJmpPage == NULL)
1279	{
1280	/* New branch target; let's take a look at it. */
1281	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1282	if (pJmpPage == NULL)
1283	{
1284	rc = VERR_NO_MEMORY;
1285	goto done;
1286	}
1287	Assert(pPage);
1288	}
1289	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1290	if (rc != VINF_SUCCESS) {
1291	goto done;
1292	}
1293	}
1294	}
1295	}
1296	}
1297	#endif
1298	if (rc != VWRN_CONTINUE_ANALYSIS) {
1299	break; //done!
1300	}
1301	next_please:
1302	if (cpu.pCurInstr->opcode == OP_JMP)
1303	{
1304	rc = VINF_SUCCESS;
1305	goto done;
1306	}
1307	pCurInstrGC += opsize;
1308	}
1309	done:
1310	pCacheRec->depth--;
1311	return rc;
1312	}
1313
1314
1315	/**
1316	* Calculates the 64 bits hash value for the current page
1317	*
1318	* @returns hash value
1319	* @param pVM The VM to operate on.
1320	* @param pInstr Page address
1321	*/
1322	uint64_t csamR3CalcPageHash(PVM pVM, RTGCPTR pInstr)
1323	{
1324	uint64_t hash = 0;
1325	uint32_t val[5];
1326	int rc;
1327
1328	Assert((pInstr & PAGE_OFFSET_MASK) == 0);
1329
1330	rc = PGMPhysReadGCPtr(pVM, &val[0], pInstr, sizeof(val[0]));
1331	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1332	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1333	{
1334	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1335	return ~0ULL;
1336	}
1337
1338	rc = PGMPhysReadGCPtr(pVM, &val[1], pInstr+1024, sizeof(val[0]));
1339	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1340	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1341	{
1342	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1343	return ~0ULL;
1344	}
1345
1346	rc = PGMPhysReadGCPtr(pVM, &val[2], pInstr+2048, sizeof(val[0]));
1347	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1348	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1349	{
1350	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1351	return ~0ULL;
1352	}
1353
1354	rc = PGMPhysReadGCPtr(pVM, &val[3], pInstr+3072, sizeof(val[0]));
1355	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1356	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1357	{
1358	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1359	return ~0ULL;
1360	}
1361
1362	rc = PGMPhysReadGCPtr(pVM, &val[4], pInstr+4092, sizeof(val[0]));
1363	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1364	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1365	{
1366	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1367	return ~0ULL;
1368	}
1369
1370	// don't want to get division by zero traps
1371	val[2] \|= 1;
1372	val[4] \|= 1;
1373
1374	hash = (uint64_t)val[0] * (uint64_t)val[1] / (uint64_t)val[2] + (val[3]%val[4]);
1375	return (hash == ~0ULL) ? hash - 1 : hash;
1376	}
1377
1378
1379	/**
1380	* Flush a page record
1381	*
1382	* @returns VBox status code. (trap handled or not)
1383	* @param pVM The VM to operate on.
1384	* @param pPage Page record ptr
1385	*/
1386	int csamR3FlushPageRecord(PVM pVM, PCSAMPAGE pPage)
1387	{
1388	Log(("csamR3FlushPageRecord: page %VGv has changed -> FLUSH\n", pPage->pPageGC));
1389
1390	if (pPage->pBitmap == NULL)
1391	{
1392	pPage->pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, CSAM_PAGE_BITMAP_SIZE);
1393	Assert(pPage->pBitmap);
1394	if (pPage->pBitmap == NULL)
1395	{
1396	return VERR_NO_MEMORY;
1397	}
1398	}
1399	else
1400	{
1401	memset(pPage->pBitmap, 0, CSAM_PAGE_BITMAP_SIZE);
1402	}
1403	pPage->u64Hash = csamR3CalcPageHash(pVM, pPage->pPageGC);
1404
1405	return VINF_SUCCESS;
1406	}
1407
1408	/**
1409	* Notify CSAM of a page flush
1410	*
1411	* @returns VBox status code
1412	* @param pVM The VM to operate on.
1413	* @param addr GC address of the page to flush
1414	* @param fRemovePage Page removal flag
1415	*/
1416	static int csamFlushPage(PVM pVM, RTGCPTR addr, bool fRemovePage)
1417	{
1418	PCSAMPAGEREC pPageRec;
1419	int rc;
1420	RTGCPHYS GCPhys = 0;
1421	uint64_t fFlags = 0;
1422
1423	if (!CSAMIsEnabled(pVM))
1424	return VINF_SUCCESS;
1425
1426	STAM_PROFILE_START(&pVM->csam.s.StatTimeFlushPage, a);
1427
1428	addr = addr & PAGE_BASE_GC_MASK;
1429
1430	/*
1431	* Note: searching for the page in our tree first is more expensive (skipped flushes are two orders of magnitude more common)
1432	*/
1433	if (pVM->csam.s.pPageTree == NULL)
1434	{
1435	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1436	return VWRN_CSAM_PAGE_NOT_FOUND;
1437	}
1438
1439	rc = PGMGstGetPage(pVM, addr, &fFlags, &GCPhys);
1440	/* Returned at a very early stage (no paging yet presumably). */
1441	if (rc == VERR_NOT_SUPPORTED)
1442	{
1443	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1444	return rc;
1445	}
1446
1447	if (VBOX_SUCCESS(rc))
1448	{
1449	if ( (fFlags & X86_PTE_US)
1450	\|\| rc == VERR_PGM_PHYS_PAGE_RESERVED
1451	)
1452	{
1453	/* User page -> not relevant for us. */
1454	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1455	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1456	return VINF_SUCCESS;
1457	}
1458	}
1459	else
1460	if (rc != VERR_PAGE_NOT_PRESENT && rc != VERR_PAGE_TABLE_NOT_PRESENT)
1461	AssertMsgFailed(("PGMR3GetPage %VGv failed with %Vrc\n", addr, rc));
1462
1463	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)addr);
1464	if (pPageRec)
1465	{
1466	if ( GCPhys == pPageRec->page.GCPhys
1467	&& (fFlags & X86_PTE_P))
1468	{
1469	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1470	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1471	return VINF_SUCCESS;
1472	}
1473
1474	Log(("CSAMR3FlushPage: page %VGv has changed -> FLUSH (rc=%Vrc) (Phys: %VGp vs %VGp)\n", addr, rc, GCPhys, pPageRec->page.GCPhys));
1475
1476	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushes, 1);
1477
1478	if (fRemovePage)
1479	csamRemovePageRecord(pVM, addr);
1480	else
1481	{
1482	CSAMMarkPage(pVM, addr, false);
1483	pPageRec->page.GCPhys = 0;
1484	pPageRec->page.fFlags = 0;
1485	rc = PGMGstGetPage(pVM, addr, &pPageRec->page.fFlags, &pPageRec->page.GCPhys);
1486	if (rc == VINF_SUCCESS)
1487	pPageRec->page.u64Hash = csamR3CalcPageHash(pVM, addr);
1488	}
1489
1490
1491	/*
1492	* Inform patch manager about the flush; no need to repeat the above check twice.
1493	*/
1494	PATMR3FlushPage(pVM, addr);
1495
1496	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1497	return VINF_SUCCESS;
1498	}
1499	else
1500	{
1501	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1502	return VWRN_CSAM_PAGE_NOT_FOUND;
1503	}
1504	}
1505
1506	/**
1507	* Notify CSAM of a page flush
1508	*
1509	* @returns VBox status code
1510	* @param pVM The VM to operate on.
1511	* @param addr GC address of the page to flush
1512	*/
1513	CSAMR3DECL(int) CSAMR3FlushPage(PVM pVM, RTGCPTR addr)
1514	{
1515	return csamFlushPage(pVM, addr, true /* remove page record */);
1516	}
1517
1518	/**
1519	* Check a page record in case a page has been changed
1520	*
1521	* @returns VBox status code. (trap handled or not)
1522	* @param pVM The VM to operate on.
1523	* @param pInstrGC GC instruction pointer
1524	*/
1525	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstrGC)
1526	{
1527	PCSAMPAGEREC pPageRec;
1528	uint64_t u64hash;
1529
1530	pInstrGC = pInstrGC & PAGE_BASE_GC_MASK;
1531
1532	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstrGC);
1533	if (pPageRec)
1534	{
1535	u64hash = csamR3CalcPageHash(pVM, pInstrGC);
1536	if (u64hash != pPageRec->page.u64Hash)
1537	{
1538	csamR3FlushPageRecord(pVM, &pPageRec->page);
1539	}
1540	}
1541	else
1542	{
1543	return VWRN_CSAM_PAGE_NOT_FOUND;
1544	}
1545	return VINF_SUCCESS;
1546	}
1547
1548	/**
1549	* Returns monitor description based on CSAM tag
1550	*
1551	* @return description string
1552	* @param enmTag Owner tag
1553	*/
1554	const char *csamGetMonitorDescription(CSAMTAG enmTag)
1555	{
1556	if (enmTag == CSAM_TAG_PATM)
1557	return "CSAM-PATM self-modifying code monitor handler";
1558	else
1559	if (enmTag == CSAM_TAG_REM)
1560	return "CSAM-REM self-modifying code monitor handler";
1561	Assert(enmTag == CSAM_TAG_CSAM);
1562	return "CSAM self-modifying code monitor handler";
1563	}
1564
1565	/**
1566	* Adds page record to our lookup tree
1567	*
1568	* @returns CSAMPAGE ptr or NULL if failure
1569	* @param pVM The VM to operate on.
1570	* @param GCPtr Page address
1571	* @param enmTag Owner tag
1572	* @param fCode32 16 or 32 bits code
1573	* @param fMonitorInvalidation Monitor page invalidation flag
1574	*/
1575	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation)
1576	{
1577	PCSAMPAGEREC pPage;
1578	int rc;
1579	bool ret;
1580
1581	Log(("New page record for %VGv\n", GCPtr & PAGE_BASE_GC_MASK));
1582
1583	pPage = (PCSAMPAGEREC)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, sizeof(CSAMPAGEREC));
1584	if (pPage == NULL)
1585	{
1586	AssertMsgFailed(("csamCreatePageRecord: Out of memory!!!!\n"));
1587	return NULL;
1588	}
1589	/* Round down to page boundary. */
1590	GCPtr = (GCPtr & PAGE_BASE_GC_MASK);
1591	pPage->Core.Key = (AVLPVKEY)GCPtr;
1592	pPage->page.pPageGC = GCPtr;
1593	pPage->page.fCode32 = fCode32;
1594	pPage->page.fMonitorInvalidation = fMonitorInvalidation;
1595	pPage->page.enmTag = enmTag;
1596	pPage->page.fMonitorActive = false;
1597	pPage->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, PAGE_SIZE/sizeof(uint8_t));
1598	rc = PGMGstGetPage(pVM, GCPtr, &pPage->page.fFlags, &pPage->page.GCPhys);
1599	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1600
1601	pPage->page.u64Hash = csamR3CalcPageHash(pVM, GCPtr);
1602	ret = RTAvlPVInsert(&pVM->csam.s.pPageTree, &pPage->Core);
1603	Assert(ret);
1604
1605	#ifdef CSAM_MONITOR_CODE_PAGES
1606	AssertRelease(!fInCSAMCodePageInvalidate);
1607
1608	switch (enmTag)
1609	{
1610	case CSAM_TAG_PATM:
1611	case CSAM_TAG_REM:
1612	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1613	case CSAM_TAG_CSAM:
1614	#endif
1615	{
1616	int rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtr, GCPtr + (PAGE_SIZE - 1) /* inclusive! */,
1617	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1618	csamGetMonitorDescription(enmTag));
1619	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", GCPtr, rc));
1620	if (VBOX_FAILURE(rc))
1621	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", GCPtr, rc));
1622
1623	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1624
1625	/* Prefetch it in case it's not there yet. */
1626	rc = PGMPrefetchPage(pVM, GCPtr);
1627	AssertRC(rc);
1628
1629	rc = PGMShwModifyPage(pVM, GCPtr, 1, 0, ~(uint64_t)X86_PTE_RW);
1630	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1631
1632	pPage->page.fMonitorActive = true;
1633	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1634	break;
1635	}
1636	default:
1637	break; /* to shut up GCC */
1638	}
1639
1640	Log(("csamCreatePageRecord %VGv HCPhys=%VGp\n", GCPtr, pPage->page.GCPhys));
1641
1642	#ifdef VBOX_WITH_STATISTICS
1643	switch (enmTag)
1644	{
1645	case CSAM_TAG_CSAM:
1646	STAM_COUNTER_INC(&pVM->csam.s.StatPageCSAM);
1647	break;
1648	case CSAM_TAG_PATM:
1649	STAM_COUNTER_INC(&pVM->csam.s.StatPagePATM);
1650	break;
1651	case CSAM_TAG_REM:
1652	STAM_COUNTER_INC(&pVM->csam.s.StatPageREM);
1653	break;
1654	default:
1655	break; /* to shut up GCC */
1656	}
1657	#endif
1658
1659	#endif
1660
1661	STAM_COUNTER_INC(&pVM->csam.s.StatNrPages);
1662	if (fMonitorInvalidation)
1663	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1664
1665	return &pPage->page;
1666	}
1667
1668	/**
1669	* Monitors a code page (if not already monitored)
1670	*
1671	* @returns VBox status code
1672	* @param pVM The VM to operate on.
1673	* @param pPageAddrGC The page to monitor
1674	* @param enmTag Monitor tag
1675	*/
1676	CSAMR3DECL(int) CSAMR3MonitorPage(PVM pVM, RTGCPTR pPageAddrGC, CSAMTAG enmTag)
1677	{
1678	PCSAMPAGEREC pPageRec = NULL;
1679	int rc;
1680	bool fMonitorInvalidation;
1681
1682	/* Dirty pages must be handled before calling this function!. */
1683	Assert(!pVM->csam.s.cDirtyPages);
1684
1685	if (pVM->csam.s.fScanningStarted == false)
1686	return VINF_SUCCESS; /* too early */
1687
1688	pPageAddrGC &= PAGE_BASE_GC_MASK;
1689
1690	Log(("CSAMR3MonitorPage %VGv %d\n", pPageAddrGC, enmTag));
1691
1692	/** @todo implicit assumption */
1693	fMonitorInvalidation = (enmTag == CSAM_TAG_PATM);
1694
1695	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1696	if (pPageRec == NULL)
1697	{
1698	uint64_t fFlags;
1699
1700	rc = PGMGstGetPage(pVM, pPageAddrGC, &fFlags, NULL);
1701	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1702	if ( rc == VINF_SUCCESS
1703	&& (fFlags & X86_PTE_US))
1704	{
1705	/* We don't care about user pages. */
1706	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
1707	return VINF_SUCCESS;
1708	}
1709
1710	csamCreatePageRecord(pVM, pPageAddrGC, enmTag, true /* 32 bits code */, fMonitorInvalidation);
1711
1712	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1713	Assert(pPageRec);
1714	}
1715	/** @todo reference count */
1716
1717	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1718	Assert(pPageRec->page.fMonitorActive);
1719	#endif
1720
1721	#ifdef CSAM_MONITOR_CODE_PAGES
1722	if (!pPageRec->page.fMonitorActive)
1723	{
1724	Log(("CSAMR3MonitorPage: activate monitoring for %VGv\n", pPageAddrGC));
1725
1726	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, pPageAddrGC, pPageAddrGC + (PAGE_SIZE - 1) /* inclusive! */,
1727	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1728	csamGetMonitorDescription(enmTag));
1729	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", pPageAddrGC, rc));
1730	if (VBOX_FAILURE(rc))
1731	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", pPageAddrGC, rc));
1732
1733	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1734
1735	/* Prefetch it in case it's not there yet. */
1736	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1737	AssertRC(rc);
1738
1739	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1740	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1741
1742	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1743
1744	pPageRec->page.fMonitorActive = true;
1745	pPageRec->page.fMonitorInvalidation = fMonitorInvalidation;
1746	}
1747	else
1748	if ( !pPageRec->page.fMonitorInvalidation
1749	&& fMonitorInvalidation)
1750	{
1751	Assert(pPageRec->page.fMonitorActive);
1752	PGMHandlerVirtualChangeInvalidateCallback(pVM, pPageRec->page.pPageGC, CSAMCodePageInvalidate);
1753	pPageRec->page.fMonitorInvalidation = true;
1754	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1755
1756	/* Prefetch it in case it's not there yet. */
1757	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1758	AssertRC(rc);
1759
1760	/* Make sure it's readonly. Page invalidation may have modified the attributes. */
1761	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1762	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1763	}
1764
1765	#if 0 /* def VBOX_STRICT -> very annoying) */
1766	if (pPageRec->page.fMonitorActive)
1767	{
1768	uint64_t fPageShw;
1769	RTHCPHYS GCPhys;
1770	rc = PGMShwGetPage(pVM, pPageAddrGC, &fPageShw, &GCPhys);
1771	// AssertMsg( (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1772	// \|\| !(fPageShw & X86_PTE_RW)
1773	// \|\| (pPageRec->page.GCPhys == 0), ("Shadow page flags for %VGv (%VHp) aren't readonly (%VX64)!!\n", pPageAddrGC, GCPhys, fPageShw));
1774	}
1775	#endif
1776
1777	if (pPageRec->page.GCPhys == 0)
1778	{
1779	/* Prefetch it in case it's not there yet. */
1780	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1781	AssertRC(rc);
1782	/* The page was changed behind our back. It won't be made read-only until the next SyncCR3, so force it here. */
1783	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1784	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1785	}
1786	#endif /* CSAM_MONITOR_CODE_PAGES */
1787	return VINF_SUCCESS;
1788	}
1789
1790	/**
1791	* Removes a page record from our lookup tree
1792	*
1793	* @returns VBox status code
1794	* @param pVM The VM to operate on.
1795	* @param GCPtr Page address
1796	*/
1797	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr)
1798	{
1799	PCSAMPAGEREC pPageRec;
1800
1801	Log(("csamRemovePageRecord %VGv\n", GCPtr));
1802	pPageRec = (PCSAMPAGEREC)RTAvlPVRemove(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
1803
1804	if (pPageRec)
1805	{
1806	STAM_COUNTER_INC(&pVM->csam.s.StatNrRemovedPages);
1807
1808	#ifdef CSAM_MONITOR_CODE_PAGES
1809	if (pPageRec->page.fMonitorActive)
1810	{
1811	/* @todo -> this is expensive (cr3 reload)!!!
1812	* if this happens often, then reuse it instead!!!
1813	*/
1814	Assert(!fInCSAMCodePageInvalidate);
1815	STAM_COUNTER_DEC(&pVM->csam.s.StatPageMonitor);
1816	PGMHandlerVirtualDeregister(pVM, GCPtr);
1817	}
1818	if (pPageRec->page.enmTag == CSAM_TAG_PATM)
1819	{
1820	/* Make sure the recompiler flushes its cache as this page is no longer monitored. */
1821	STAM_COUNTER_INC(&pVM->csam.s.StatPageRemoveREMFlush);
1822	CPUMSetChangedFlags(pVM, CPUM_CHANGED_GLOBAL_TLB_FLUSH);
1823	}
1824	#endif
1825
1826	#ifdef VBOX_WITH_STATISTICS
1827	switch (pPageRec->page.enmTag)
1828	{
1829	case CSAM_TAG_CSAM:
1830	STAM_COUNTER_DEC(&pVM->csam.s.StatPageCSAM);
1831	break;
1832	case CSAM_TAG_PATM:
1833	STAM_COUNTER_DEC(&pVM->csam.s.StatPagePATM);
1834	break;
1835	case CSAM_TAG_REM:
1836	STAM_COUNTER_DEC(&pVM->csam.s.StatPageREM);
1837	break;
1838	default:
1839	break; /* to shut up GCC */
1840	}
1841	#endif
1842
1843	if (pPageRec->page.pBitmap) MMR3HeapFree(pPageRec->page.pBitmap);
1844	MMR3HeapFree(pPageRec);
1845	}
1846	else
1847	AssertFailed();
1848
1849	return VINF_SUCCESS;
1850	}
1851
1852	/**
1853	* Callback for delayed writes from non-EMT threads
1854	*
1855	* @param pVM VM Handle.
1856	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1857	* @param cbBuf How much it's reading/writing.
1858	*/
1859	static void CSAMDelayedWriteHandler(PVM pVM, RTGCPTR GCPtr, size_t cbBuf)
1860	{
1861	int rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1862	AssertRC(rc);
1863	}
1864
1865	/**
1866	* #PF Handler callback for virtual access handler ranges.
1867	*
1868	* Important to realize that a physical page in a range can have aliases, and
1869	* for ALL and WRITE handlers these will also trigger.
1870	*
1871	* @returns VINF_SUCCESS if the handler have carried out the operation.
1872	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1873	* @param pVM VM Handle.
1874	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1875	* @param pvPtr The HC mapping of that address.
1876	* @param pvBuf What the guest is reading/writing.
1877	* @param cbBuf How much it's reading/writing.
1878	* @param enmAccessType The access type.
1879	* @param pvUser User argument.
1880	*/
1881	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1882	{
1883	int rc;
1884
1885	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1886	Log(("CSAMCodePageWriteHandler: write to %VGv size=%d\n", GCPtr, cbBuf));
1887
1888	if (VM_IS_EMT(pVM))
1889	{
1890	rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1891	}
1892	else
1893	{
1894	/* Queue the write instead otherwise we'll get concurrency issues. */
1895	/** @note in theory not correct to let it write the data first before disabling a patch!
1896	* (if it writes the same data as the patch jump and we replace it with obsolete opcodes)
1897	*/
1898	Log(("CSAMCodePageWriteHandler: delayed write!\n"));
1899	rc = VMR3ReqCallEx(pVM, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID,
1900	(PFNRT)CSAMDelayedWriteHandler, 3, pVM, GCPtr, cbBuf);
1901	}
1902	AssertRC(rc);
1903
1904	return VINF_PGM_HANDLER_DO_DEFAULT;
1905	}
1906
1907	/**
1908	* #PF Handler callback for invalidation of virtual access handler ranges.
1909	*
1910	* @param pVM VM Handle.
1911	* @param GCPtr The virtual address the guest has changed.
1912	*/
1913	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr)
1914	{
1915	fInCSAMCodePageInvalidate = true;
1916	LogFlow(("CSAMCodePageInvalidate %VGv\n", GCPtr));
1917	/** @todo We can't remove the page (which unregisters the virtual handler) as we are called from a DoWithAll on the virtual handler tree. Argh. */
1918	csamFlushPage(pVM, GCPtr, false /* don't remove page! */);
1919	fInCSAMCodePageInvalidate = false;
1920	return VINF_SUCCESS;
1921	}
1922
1923	/**
1924	* Check if the current instruction has already been checked before
1925	*
1926	* @returns VBox status code. (trap handled or not)
1927	* @param pVM The VM to operate on.
1928	* @param pInstr Instruction pointer
1929	* @param pPage CSAM patch structure pointer
1930	*/
1931	bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage)
1932	{
1933	PCSAMPAGEREC pPageRec;
1934	uint32_t offset;
1935
1936	STAM_PROFILE_START(&pVM->csam.s.StatTimeCheckAddr, a);
1937
1938	offset = pInstr & PAGE_OFFSET_MASK;
1939	pInstr = pInstr & PAGE_BASE_GC_MASK;
1940
1941	Assert(pPage);
1942
1943	if (pPage && (pPage)->pPageGC == pInstr)
1944	{
1945	if ((pPage)->pBitmap == NULL \|\| ASMBitTest((pPage)->pBitmap, offset))
1946	{
1947	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1948	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1949	return true;
1950	}
1951	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1952	return false;
1953	}
1954
1955	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstr);
1956	if (pPageRec)
1957	{
1958	if (pPage) *pPage= &pPageRec->page;
1959	if (pPageRec->page.pBitmap == NULL \|\| ASMBitTest(pPageRec->page.pBitmap, offset))
1960	{
1961	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1962	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1963	return true;
1964	}
1965	}
1966	else
1967	{
1968	if (pPage) *pPage = NULL;
1969	}
1970	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1971	return false;
1972	}
1973
1974	/**
1975	* Mark an instruction in a page as scanned/not scanned
1976	*
1977	* @param pVM The VM to operate on.
1978	* @param pPage Patch structure pointer
1979	* @param pInstr Instruction pointer
1980	* @param opsize Instruction size
1981	* @param fScanned Mark as scanned or not
1982	*/
1983	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
1984	{
1985	LogFlow(("csamMarkCodeAsScanned %VGv opsize=%d\n", pInstr, opsize));
1986	CSAMMarkPage(pVM, pInstr, fScanned);
1987
1988	/** @todo should recreate empty bitmap if !fScanned */
1989	if (pPage->pBitmap == NULL)
1990	return;
1991
1992	if (fScanned)
1993	{
1994	// retn instructions can be scanned more than once
1995	if (ASMBitTest(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK) == 0)
1996	{
1997	pPage->uSize += opsize;
1998	STAM_COUNTER_ADD(&pVM->csam.s.StatNrInstr, 1);
1999	}
2000	if (pPage->uSize >= PAGE_SIZE)
2001	{
2002	Log(("Scanned full page (%VGv) -> free bitmap\n", pInstr & PAGE_BASE_GC_MASK));
2003	MMR3HeapFree(pPage->pBitmap);
2004	pPage->pBitmap = NULL;
2005	}
2006	else
2007	ASMBitSet(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2008	}
2009	else
2010	ASMBitClear(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2011	}
2012
2013	/**
2014	* Mark an instruction in a page as scanned/not scanned
2015	*
2016	* @returns VBox status code.
2017	* @param pVM The VM to operate on.
2018	* @param pInstr Instruction pointer
2019	* @param opsize Instruction size
2020	* @param fScanned Mark as scanned or not
2021	*/
2022	CSAMDECL(int) CSAMR3MarkCode(PVM pVM, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
2023	{
2024	PCSAMPAGE pPage = 0;
2025
2026	Assert(!fScanned); /* other case not implemented. */
2027	Assert(!PATMIsPatchGCAddr(pVM, pInstr));
2028
2029	if (csamIsCodeScanned(pVM, pInstr, &pPage) == false)
2030	{
2031	Assert(fScanned == true); /* other case should not be possible */
2032	return VINF_SUCCESS;
2033	}
2034
2035	Log(("CSAMR3MarkCode: %VGv size=%d fScanned=%d\n", pInstr, opsize, fScanned));
2036	csamMarkCode(pVM, pPage, pInstr, opsize, fScanned);
2037	return VINF_SUCCESS;
2038	}
2039
2040
2041	/**
2042	* Scan and analyse code starting at specified EIP
2043	*
2044	* @returns VBox status code. (trap handled or not)
2045	* @param pVM The VM to operate on.
2046	* @param pEip Instruction pointer
2047	* @param fCode32 16 of 32 bits code
2048	*/
2049	CSAMR3DECL(int) CSAMR3CheckEIP(PVM pVM, RTGCPTR pEip, bool fCode32)
2050	{
2051	int rc;
2052	PCSAMPAGE pPage = NULL;
2053
2054	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pEip) == true)
2055	{
2056	// No use
2057	return VINF_SUCCESS;
2058	}
2059
2060	if (CSAMIsEnabled(pVM))
2061	{
2062	// Cache record for PATMGCVirtToHCVirt
2063	CSAMP2GLOOKUPREC cacheRec = {0};
2064
2065	//assuming 32 bits code for now
2066	Assert(fCode32);
2067
2068	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2069	rc = csamAnalyseCallCodeStream(pVM, pEip, pEip, fCode32, CSAMR3AnalyseCallback, pPage, &cacheRec);
2070	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2071	if (rc != VINF_SUCCESS)
2072	{
2073	Log(("csamAnalyseCodeStream failed with %d\n", rc));
2074	return rc;
2075	}
2076	else
2077	{
2078	// Log(("CSAMR3CheckEIP: already scanned page at %VGv\n", pEip));
2079	}
2080	}
2081	return VINF_SUCCESS;
2082	}
2083
2084	/**
2085	* Flush dirty code pages
2086	*
2087	* @returns VBox status code.
2088	* @param pVM The VM to operate on.
2089	*/
2090	CSAMR3DECL(int) CSAMR3FlushDirtyPages(PVM pVM)
2091	{
2092	STAM_PROFILE_START(&pVM->csam.s.StatFlushDirtyPages, a);
2093
2094	for (uint32_t i=0;i<pVM->csam.s.cDirtyPages;i++)
2095	{
2096	int rc;
2097	PCSAMPAGEREC pPageRec;
2098	RTGCPTR GCPtr = pVM->csam.s.pvDirtyBasePage[i];
2099
2100	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2101
2102	/* Notify the recompiler that this page has been changed. */
2103	REMR3NotifyCodePageChanged(pVM, GCPtr);
2104
2105	/* Enable write protection again. (use the fault address as it might be an alias) */
2106	rc = PGMShwModifyPage(pVM, pVM->csam.s.pvDirtyFaultPage[i], 1, 0, ~(uint64_t)X86_PTE_RW);
2107	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2108
2109	Log(("CSAMR3FlushDirtyPages: flush %VGv (modifypage rc=%Vrc)\n", pVM->csam.s.pvDirtyBasePage[i], rc));
2110
2111	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
2112	if (pPageRec && pPageRec->page.enmTag == CSAM_TAG_REM)
2113	{
2114	uint64_t fFlags;
2115
2116	rc = PGMGstGetPage(pVM, GCPtr, &fFlags, NULL);
2117	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
2118	if ( rc == VINF_SUCCESS
2119	&& (fFlags & X86_PTE_US))
2120	{
2121	/* We don't care about user pages. */
2122	csamRemovePageRecord(pVM, GCPtr);
2123	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
2124	}
2125	}
2126	}
2127	pVM->csam.s.cDirtyPages = 0;
2128	VM_FF_CLEAR(pVM, VM_FF_CSAM_FLUSH_DIRTY_PAGE);
2129	STAM_PROFILE_STOP(&pVM->csam.s.StatFlushDirtyPages, a);
2130	return VINF_SUCCESS;
2131	}
2132
2133	/**
2134	* Analyse interrupt and trap gates
2135	*
2136	* @returns VBox status code.
2137	* @param pVM The VM to operate on.
2138	* @param iGate Start gate
2139	* @param cGates Number of gates to check
2140	*/
2141	CSAMR3DECL(int) CSAMR3CheckGates(PVM pVM, uint32_t iGate, uint32_t cGates)
2142	{
2143	uint16_t cbIDT;
2144	RTGCPTR GCPtrIDT = CPUMGetGuestIDTR(pVM, &cbIDT);
2145	uint32_t iGateEnd;
2146	uint32_t maxGates;
2147	VBOXIDTE aIDT[256];
2148	PVBOXIDTE pGuestIdte;
2149	int rc;
2150
2151	if (EMIsRawRing0Enabled(pVM) == false)
2152	{
2153	/* Enabling interrupt gates only works when raw ring 0 is enabled. */
2154	AssertFailed();
2155	return VINF_SUCCESS;
2156	}
2157
2158	/* We only check all gates once during a session */
2159	if ( !pVM->csam.s.fGatesChecked
2160	&& cGates != 256)
2161	return VINF_SUCCESS; /* too early */
2162
2163	/* We only check all gates once during a session */
2164	if ( pVM->csam.s.fGatesChecked
2165	&& cGates != 1)
2166	return VINF_SUCCESS; /* ignored */
2167
2168	if (cGates != 1)
2169	pVM->csam.s.fGatesChecked = true;
2170
2171	Assert(GCPtrIDT && cGates <= 256);
2172	if (!GCPtrIDT \|\| cGates > 256)
2173	return VERR_INVALID_PARAMETER;
2174
2175	/* Determine valid upper boundary. */
2176	maxGates = (cbIDT+1) / sizeof(VBOXIDTE);
2177	Assert(iGate < maxGates);
2178	if (iGate > maxGates)
2179	return VERR_INVALID_PARAMETER;
2180
2181	if (iGate + cGates > maxGates)
2182	cGates = maxGates - iGate;
2183
2184	GCPtrIDT = GCPtrIDT + iGate * sizeof(VBOXIDTE);
2185	iGateEnd = iGate + cGates;
2186
2187	STAM_PROFILE_START(&pVM->csam.s.StatCheckGates, a);
2188
2189	/*
2190	* Get IDT entries.
2191	*/
2192	if (PAGE_ADDRESS(GCPtrIDT) == PAGE_ADDRESS(GCPtrIDT+cGates*sizeof(VBOXIDTE)))
2193	{
2194	/* Just convert the IDT address to a HC pointer. The whole IDT fits in one page. */
2195	rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrIDT, (PRTHCPTR)&pGuestIdte);
2196	if (VBOX_FAILURE(rc))
2197	{
2198	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2199	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2200	return rc;
2201	}
2202	}
2203	else
2204	{
2205	/* Slow method when it crosses a page boundary. */
2206	rc = PGMPhysReadGCPtr(pVM, aIDT, GCPtrIDT, cGates*sizeof(VBOXIDTE));
2207	if (VBOX_FAILURE(rc))
2208	{
2209	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2210	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2211	return rc;
2212	}
2213	pGuestIdte = &aIDT[0];
2214	}
2215
2216	for (/iGate/; iGate<iGateEnd; iGate++, pGuestIdte++)
2217	{
2218	Assert(TRPMR3GetGuestTrapHandler(pVM, iGate) == TRPM_INVALID_HANDLER);
2219
2220	if ( pGuestIdte->Gen.u1Present
2221	&& (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
2222	&& (pGuestIdte->Gen.u2DPL == 3 \|\| pGuestIdte->Gen.u2DPL == 0)
2223	)
2224	{
2225	RTGCPTR pHandler;
2226	CSAMP2GLOOKUPREC cacheRec = {0}; /* Cache record for PATMGCVirtToHCVirt. */
2227	PCSAMPAGE pPage = NULL;
2228
2229	pHandler = (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow;
2230	pHandler = SELMToFlat(pVM, pGuestIdte->Gen.u16SegSel, 0, pHandler);
2231
2232	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2233	{
2234	Log(("CSAMCheckGates: check trap gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2235	}
2236	else
2237	{
2238	Log(("CSAMCheckGates: check interrupt gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2239	}
2240
2241	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2242	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2243	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2244	if (rc != VINF_SUCCESS)
2245	{
2246	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2247	continue;
2248	}
2249	if (iGate >= 0x20)
2250	{
2251	/* OpenBSD guest specific patch test (3.7 & 3.8) */
2252	rc = PATMR3InstallPatch(pVM, pHandler - 3, PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2253	if (VBOX_FAILURE(rc))
2254	/* OpenBSD guest specific patch test (3.9 & 4.0) */
2255	rc = PATMR3InstallPatch(pVM, pHandler - 0x2B, PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2256	if (VBOX_SUCCESS(rc))
2257	Log(("Installed OpenBSD interrupt handler prefix instruction (push cs) patch\n"));
2258	}
2259
2260	/* Trap gates and certain interrupt gates. */
2261	uint32_t fPatchFlags = PATMFL_CODE32 \| PATMFL_IDTHANDLER;
2262
2263	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2264	fPatchFlags \|= PATMFL_TRAPHANDLER;
2265	else
2266	fPatchFlags \|= PATMFL_INTHANDLER;
2267
2268	switch (iGate) {
2269	case 8:
2270	case 10:
2271	case 11:
2272	case 12:
2273	case 13:
2274	case 14:
2275	case 17:
2276	fPatchFlags \|= PATMFL_TRAPHANDLER_WITH_ERRORCODE;
2277	break;
2278	default:
2279	/* No error code. */
2280	break;
2281	}
2282
2283	Log(("Installing %s gate handler for 0x%X at %VGv\n", (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32) ? "trap" : "intr", iGate, pHandler));
2284
2285	rc = PATMR3InstallPatch(pVM, pHandler, fPatchFlags);
2286	if (VBOX_SUCCESS(rc) \|\| rc == VERR_PATM_ALREADY_PATCHED)
2287	{
2288	Log(("Gate handler 0x%X is SAFE!\n", iGate));
2289
2290	RTGCPTR pNewHandlerGC = PATMR3QueryPatchGCPtr(pVM, pHandler);
2291	if (pNewHandlerGC)
2292	{
2293	rc = TRPMR3SetGuestTrapHandler(pVM, iGate, pNewHandlerGC);
2294	if (VBOX_FAILURE(rc))
2295	Log(("TRPMR3SetGuestTrapHandler %d failed with %Vrc\n", iGate, rc));
2296	}
2297	}
2298	}
2299	} /* for */
2300	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2301	return VINF_SUCCESS;
2302	}
2303
2304	/**
2305	* Query CSAM state (enabled/disabled)
2306	*
2307	* @returns 0 - disabled, 1 - enabled
2308	* @param pVM The VM to operate on.
2309	*/
2310	CSAMR3DECL(int) CSAMR3IsEnabled(PVM pVM)
2311	{
2312	return pVM->fCSAMEnabled;
2313	}
2314
2315	#ifdef VBOX_WITH_DEBUGGER
2316	/**
2317	* The '.csamoff' command.
2318	*
2319	* @returns VBox status.
2320	* @param pCmd Pointer to the command descriptor (as registered).
2321	* @param pCmdHlp Pointer to command helper functions.
2322	* @param pVM Pointer to the current VM (if any).
2323	* @param paArgs Pointer to (readonly) array of arguments.
2324	* @param cArgs Number of arguments in the array.
2325	*/
2326	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2327	{
2328	/*
2329	* Validate input.
2330	*/
2331	if (!pVM)
2332	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2333
2334	CSAMDisableScanning(pVM);
2335	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning disabled\n");
2336	}
2337
2338	/**
2339	* The '.csamon' command.
2340	*
2341	* @returns VBox status.
2342	* @param pCmd Pointer to the command descriptor (as registered).
2343	* @param pCmdHlp Pointer to command helper functions.
2344	* @param pVM Pointer to the current VM (if any).
2345	* @param paArgs Pointer to (readonly) array of arguments.
2346	* @param cArgs Number of arguments in the array.
2347	*/
2348	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2349	{
2350	/*
2351	* Validate input.
2352	*/
2353	if (!pVM)
2354	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2355
2356	CSAMEnableScanning(pVM);
2357	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning enabled\n");
2358	}
2359	#endif

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source: vbox/trunk/src/VBox/VMM/PATM/CSAM.cpp@ 347

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