CSAM.cpp@ 1086

Last change on this file since 1086 was 1086, checked in by vboxsync, 18 years ago
Corrected assumptions about flat addresses
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 84.7 KB

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1	/* $Id: CSAM.cpp 1086 2007-02-28 08:36:20Z 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/cpumdis.h>
31	#include <VBox/pgm.h>
32	#include <VBox/iom.h>
33	#include <VBox/sup.h>
34	#include <VBox/mm.h>
35	#include <VBox/em.h>
36	#include <VBox/rem.h>
37	#include <VBox/selm.h>
38	#include <VBox/trpm.h>
39	#include <VBox/cfgm.h>
40	#include <VBox/param.h>
41	#include <iprt/avl.h>
42	#include <iprt/asm.h>
43	#include <iprt/thread.h>
44	#include "CSAMInternal.h"
45	#include <VBox/vm.h>
46	#include <VBox/dbg.h>
47	#include <VBox/err.h>
48	#include <VBox/ssm.h>
49	#include <VBox/log.h>
50	#include <iprt/assert.h>
51	#include <iprt/string.h>
52	#include <VBox/dis.h>
53	#include <VBox/disopcode.h>
54	#include <stdlib.h>
55	#include <stdio.h>
56
57
58	/* Enabled by default */
59	#define CSAM_ENABLE
60
61	/* Enable to monitor code pages for self-modifying code. */
62	#define CSAM_MONITOR_CODE_PAGES
63	/* Enable to monitor all scanned pages
64	#define CSAM_MONITOR_CSAM_CODE_PAGES */
65
66	/*******************************************************************************
67	* Internal Functions *
68	*******************************************************************************/
69	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM);
70	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
71	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
72	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr);
73
74	bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage);
75	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstr);
76	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
77	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr);
78	static int csamReinit(PVM pVM);
79	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned);
80	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
81	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec);
82
83	/** @todo Temporary for debugging. */
84	static bool fInCSAMCodePageInvalidate = false;
85
86	/*******************************************************************************
87	* Global Variables *
88	*******************************************************************************/
89	#ifdef VBOX_WITH_DEBUGGER
90	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
91	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
92
93	/** Command descriptors. */
94	static const DBGCCMD g_aCmds[] =
95	{
96	/* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, pResultDesc, fFlags, pfnHandler pszSyntax, ....pszDescription */
97	{ "csamon", 0, 0, NULL, 0, NULL, 0, csamr3CmdOn, "", "Enable CSAM code scanning." },
98	{ "csamoff", 0, 0, NULL, 0, NULL, 0, csamr3CmdOff, "", "Disable CSAM code scanning." },
99	};
100	#endif
101
102
103	/**
104	* Initializes the CSAM.
105	*
106	* @returns VBox status code.
107	* @param pVM The VM to operate on.
108	*/
109	CSAMR3DECL(int) CSAMR3Init(PVM pVM)
110	{
111	int rc;
112
113	LogFlow(("CSAMR3Init\n"));
114
115	/* Allocate bitmap for the page directory. */
116	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTHCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDBitmapHC);
117	AssertRCReturn(rc, rc);
118	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTGCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDGCBitmapHC);
119	AssertRCReturn(rc, rc);
120	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
121	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
122
123	rc = csamReinit(pVM);
124	AssertRCReturn(rc, rc);
125
126	/*
127	* Register save and load state notificators.
128	*/
129	rc = SSMR3RegisterInternal(pVM, "CSAM", 0, CSAM_SSM_VERSION, sizeof(pVM->csam.s) + PAGE_SIZE*16,
130	NULL, csamr3Save, NULL,
131	NULL, csamr3Load, NULL);
132	AssertRCReturn(rc, rc);
133
134	STAM_REG(pVM, &pVM->csam.s.StatNrTraps, STAMTYPE_COUNTER, "/CSAM/PageTraps", STAMUNIT_OCCURENCES, "The number of CSAM page traps.");
135	STAM_REG(pVM, &pVM->csam.s.StatDangerousWrite, STAMTYPE_COUNTER, "/CSAM/DangerousWrites", STAMUNIT_OCCURENCES, "The number of dangerous writes that cause a context switch.");
136
137	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPHC, STAMTYPE_COUNTER, "/CSAM/HC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
138	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPGC, STAMTYPE_COUNTER, "/CSAM/GC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
139	STAM_REG(pVM, &pVM->csam.s.StatNrPages, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRW", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW monitoring).");
140	STAM_REG(pVM, &pVM->csam.s.StatNrPagesInv, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRWI", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW & invalidation monitoring).");
141	STAM_REG(pVM, &pVM->csam.s.StatNrRemovedPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Removed", STAMUNIT_OCCURENCES, "The number of removed CSAM page records.");
142	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.");
143
144	STAM_REG(pVM, &pVM->csam.s.StatNrPatchPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Patch", STAMUNIT_OCCURENCES, "The number of CSAM patch page records.");
145	STAM_REG(pVM, &pVM->csam.s.StatNrUserPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Ignore/User", STAMUNIT_OCCURENCES, "The number of CSAM user page records (ignored).");
146	STAM_REG(pVM, &pVM->csam.s.StatPagePATM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/PATM", STAMUNIT_OCCURENCES, "The number of PATM page records.");
147	STAM_REG(pVM, &pVM->csam.s.StatPageCSAM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/CSAM", STAMUNIT_OCCURENCES, "The number of CSAM page records.");
148	STAM_REG(pVM, &pVM->csam.s.StatPageREM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/REM", STAMUNIT_OCCURENCES, "The number of REM page records.");
149	STAM_REG(pVM, &pVM->csam.s.StatPageMonitor, STAMTYPE_COUNTER, "/CSAM/PageRec/Monitored", STAMUNIT_OCCURENCES, "The number of monitored pages.");
150
151	STAM_REG(pVM, &pVM->csam.s.StatCodePageModified, STAMTYPE_COUNTER, "/CSAM/Monitor/DirtyPage", STAMUNIT_OCCURENCES, "The number of code page modifications.");
152
153	STAM_REG(pVM, &pVM->csam.s.StatNrFlushes, STAMTYPE_COUNTER, "/CSAM/PageFlushes", STAMUNIT_OCCURENCES, "The number of CSAM page flushes.");
154	STAM_REG(pVM, &pVM->csam.s.StatNrFlushesSkipped, STAMTYPE_COUNTER, "/CSAM/PageFlushesSkipped", STAMUNIT_OCCURENCES, "The number of CSAM page flushes that were skipped.");
155	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesHC, STAMTYPE_COUNTER, "/CSAM/HC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
156	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesGC, STAMTYPE_COUNTER, "/CSAM/GC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
157	STAM_REG(pVM, &pVM->csam.s.StatNrInstr, STAMTYPE_COUNTER, "/CSAM/ScannedInstr", STAMUNIT_OCCURENCES, "The number of scanned instructions.");
158	STAM_REG(pVM, &pVM->csam.s.StatNrBytesRead, STAMTYPE_COUNTER, "/CSAM/BytesRead", STAMUNIT_OCCURENCES, "The number of bytes read for scanning.");
159	STAM_REG(pVM, &pVM->csam.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/CSAM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
160
161	STAM_REG(pVM, &pVM->csam.s.StatBitmapAlloc, STAMTYPE_COUNTER, "/CSAM/Alloc/PageBitmap", STAMUNIT_OCCURENCES, "The number of page bitmap allocations.");
162
163	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheHit, STAMTYPE_COUNTER, "/CSAM/Cache/Hit", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache hits.");
164	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheMiss, STAMTYPE_COUNTER, "/CSAM/Cache/Miss", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache misses.");
165
166	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunction, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Success", STAMUNIT_OCCURENCES, "The number of found functions beyond the ret border.");
167	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunctionFailed, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Failed", STAMUNIT_OCCURENCES, "The number of refused functions beyond the ret border.");
168
169	STAM_REG(pVM, &pVM->csam.s.StatTime, STAMTYPE_PROFILE, "/PROF/CSAM/Scan", STAMUNIT_TICKS_PER_CALL, "Scanning overhead.");
170	STAM_REG(pVM, &pVM->csam.s.StatTimeCheckAddr, STAMTYPE_PROFILE, "/PROF/CSAM/CheckAddr", STAMUNIT_TICKS_PER_CALL, "Address check overhead.");
171	STAM_REG(pVM, &pVM->csam.s.StatTimeAddrConv, STAMTYPE_PROFILE, "/PROF/CSAM/AddrConv", STAMUNIT_TICKS_PER_CALL, "Address conversion overhead.");
172	STAM_REG(pVM, &pVM->csam.s.StatTimeFlushPage, STAMTYPE_PROFILE, "/PROF/CSAM/FlushPage", STAMUNIT_TICKS_PER_CALL, "Page flushing overhead.");
173	STAM_REG(pVM, &pVM->csam.s.StatTimeDisasm, STAMTYPE_PROFILE, "/PROF/CSAM/Disasm", STAMUNIT_TICKS_PER_CALL, "Disassembly overhead.");
174	STAM_REG(pVM, &pVM->csam.s.StatFlushDirtyPages, STAMTYPE_PROFILE, "/PROF/CSAM/FlushDirtyPage", STAMUNIT_TICKS_PER_CALL, "Dirty page flushing overhead.");
175	STAM_REG(pVM, &pVM->csam.s.StatCheckGates, STAMTYPE_PROFILE, "/PROF/CSAM/CheckGates", STAMUNIT_TICKS_PER_CALL, "CSAMR3CheckGates overhead.");
176
177	/*
178	* Check CFGM option and enable/disable CSAM.
179	*/
180	bool fEnabled;
181	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "CSAMEnabled", &fEnabled);
182	if (VBOX_FAILURE(rc))
183	#ifdef CSAM_ENABLE
184	fEnabled = true;
185	#else
186	fEnabled = false;
187	#endif
188	if (fEnabled)
189	CSAMEnableScanning(pVM);
190
191	#ifdef VBOX_WITH_DEBUGGER
192	/*
193	* Debugger commands.
194	*/
195	static bool fRegisteredCmds = false;
196	if (!fRegisteredCmds)
197	{
198	int rc = DBGCRegisterCommands(&g_aCmds[0], ELEMENTS(g_aCmds));
199	if (VBOX_SUCCESS(rc))
200	fRegisteredCmds = true;
201	}
202	#endif
203
204	return VINF_SUCCESS;
205	}
206
207	/**
208	* (Re)initializes CSAM
209	*
210	* @param pVM The VM.
211	*/
212	static int csamReinit(PVM pVM)
213	{
214	/*
215	* Assert alignment and sizes.
216	*/
217	AssertRelease(!(RT_OFFSETOF(VM, csam.s) & 31));
218	AssertRelease(sizeof(pVM->csam.s) <= sizeof(pVM->csam.padding));
219
220	/*
221	* Setup any fixed pointers and offsets.
222	*/
223	pVM->csam.s.offVM = RT_OFFSETOF(VM, patm);
224
225	pVM->csam.s.fGatesChecked = false;
226	pVM->csam.s.fScanningStarted = false;
227
228	VM_FF_CLEAR(pVM, VM_FF_CSAM_FLUSH_DIRTY_PAGE);
229	pVM->csam.s.cDirtyPages = 0;
230	/* not necessary */
231	memset(pVM->csam.s.pvDirtyBasePage, 0, sizeof(pVM->csam.s.pvDirtyBasePage));
232	memset(pVM->csam.s.pvDirtyFaultPage, 0, sizeof(pVM->csam.s.pvDirtyFaultPage));
233
234	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
235	pVM->csam.s.cDangerousInstr = 0;
236	pVM->csam.s.iDangerousInstr = 0;
237
238	/** @note never mess with the pgdir bitmap here! */
239	return VINF_SUCCESS;
240	}
241
242	/**
243	* Applies relocations to data and code managed by this
244	* component. This function will be called at init and
245	* whenever the VMM need to relocate itself inside the GC.
246	*
247	* The csam will update the addresses used by the switcher.
248	*
249	* @param pVM The VM.
250	* @param offDelta Relocation delta.
251	*/
252	CSAMR3DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
253	{
254	if (offDelta)
255	{
256	/* Adjust pgdir and page bitmap pointers. */
257	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
258	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
259
260	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
261	{
262	if (pVM->csam.s.pPDGCBitmapHC[i])
263	{
264	pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
265	}
266	}
267	}
268	return;
269	}
270
271	/**
272	* Terminates the csam.
273	*
274	* Termination means cleaning up and freeing all resources,
275	* the VM it self is at this point powered off or suspended.
276	*
277	* @returns VBox status code.
278	* @param pVM The VM to operate on.
279	*/
280	CSAMR3DECL(int) CSAMR3Term(PVM pVM)
281	{
282	int rc;
283
284	rc = CSAMR3Reset(pVM);
285	AssertRC(rc);
286
287	/* @todo triggers assertion in MMHyperFree */
288	#if 0
289	for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
290	{
291	if (pVM->csam.s.pPDBitmapHC[i])
292	MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
293	}
294	#endif
295
296	return VINF_SUCCESS;
297	}
298
299	/**
300	* CSAM reset callback.
301	*
302	* @returns VBox status code.
303	* @param pVM The VM which is reset.
304	*/
305	CSAMR3DECL(int) CSAMR3Reset(PVM pVM)
306	{
307	/* Clear page bitmaps. */
308	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
309	{
310	if (pVM->csam.s.pPDBitmapHC[i])
311	{
312	Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
313	ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
314	}
315	}
316
317	/* Remove all CSAM page records. */
318	while(true)
319	{
320	PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
321	if (pPageRec)
322	{
323	csamRemovePageRecord(pVM, pPageRec->page.pPageGC);
324	}
325	else
326	break;
327	}
328	Assert(!pVM->csam.s.pPageTree);
329
330	csamReinit(pVM);
331
332	return VINF_SUCCESS;
333	}
334
335	#define CSAM_SUBTRACT_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) - (uintptr_t)(b)
336	#define CSAM_ADD_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) + (uintptr_t)(b)
337
338
339	/**
340	* Callback function for RTAvlPVDoWithAll
341	*
342	* Counts the number of records in the tree
343	*
344	* @returns VBox status code.
345	* @param pNode Current node
346	* @param pcPatches Pointer to patch counter
347	*/
348	static DECLCALLBACK(int) CountRecord(PAVLPVNODECORE pNode, void *pcPatches)
349	{
350	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
351	return VINF_SUCCESS;
352	}
353
354	/**
355	* Callback function for RTAvlPVDoWithAll
356	*
357	* Saves the state of the page record
358	*
359	* @returns VBox status code.
360	* @param pNode Current node
361	* @param pVM1 VM Handle
362	*/
363	static DECLCALLBACK(int) SavePageState(PAVLPVNODECORE pNode, void *pVM1)
364	{
365	PVM pVM = (PVM)pVM1;
366	PCSAMPAGEREC pPage = (PCSAMPAGEREC)pNode;
367	CSAMPAGEREC page = *pPage;
368	PSSMHANDLE pSSM = pVM->csam.s.savedstate.pSSM;
369	int rc;
370
371	/* Save the page record itself */
372	rc = SSMR3PutMem(pSSM, &page, sizeof(page));
373	AssertRCReturn(rc, rc);
374
375	if (page.page.pBitmap)
376	{
377	rc = SSMR3PutMem(pSSM, page.page.pBitmap, CSAM_PAGE_BITMAP_SIZE);
378	AssertRCReturn(rc, rc);
379	}
380
381	return VINF_SUCCESS;
382	}
383
384	/**
385	* Execute state save operation.
386	*
387	* @returns VBox status code.
388	* @param pVM VM Handle.
389	* @param pSSM SSM operation handle.
390	*/
391	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM)
392	{
393	CSAM csamInfo = pVM->csam.s;
394	int rc;
395
396	/*
397	* Count the number of page records in the tree (feeling lazy)
398	*/
399	csamInfo.savedstate.cPageRecords = 0;
400	RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, CountRecord, &csamInfo.savedstate.cPageRecords);
401
402	/*
403	* Save CSAM structure
404	*/
405	pVM->csam.s.savedstate.pSSM = pSSM;
406	rc = SSMR3PutMem(pSSM, &csamInfo, sizeof(csamInfo));
407	AssertRCReturn(rc, rc);
408
409	/* Save pgdir bitmap */
410	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
411	AssertRCReturn(rc, rc);
412
413	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
414	{
415	if(csamInfo.pPDBitmapHC[i])
416	{
417	/* Save the page bitmap. */
418	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
419	AssertRCReturn(rc, rc);
420	}
421	}
422
423	/*
424	* Save page records
425	*/
426	rc = RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, SavePageState, pVM);
427	AssertRCReturn(rc, rc);
428
429	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
430	return VINF_SUCCESS;
431	}
432
433	/**
434	* Execute state load operation.
435	*
436	* @returns VBox status code.
437	* @param pVM VM Handle.
438	* @param pSSM SSM operation handle.
439	* @param u32Version Data layout version.
440	*/
441	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
442	{
443	int rc;
444	CSAM csamInfo;
445
446	if (u32Version != CSAM_SSM_VERSION)
447	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
448
449	pVM->csam.s.savedstate.pSSM = pSSM;
450
451	/*
452	* Restore CSAM structure
453	*/
454	rc = SSMR3GetMem(pSSM, &csamInfo, sizeof(csamInfo));
455	AssertRCReturn(rc, rc);
456
457	pVM->csam.s.fGatesChecked = csamInfo.fGatesChecked;
458	pVM->csam.s.fScanningStarted = csamInfo.fScanningStarted;
459
460	/* Restore dirty code page info. */
461	pVM->csam.s.cDirtyPages = csamInfo.cDirtyPages;
462	memcpy(pVM->csam.s.pvDirtyBasePage, csamInfo.pvDirtyBasePage, sizeof(pVM->csam.s.pvDirtyBasePage));
463	memcpy(pVM->csam.s.pvDirtyFaultPage, csamInfo.pvDirtyFaultPage, sizeof(pVM->csam.s.pvDirtyFaultPage));
464
465	/* Restore pgdir bitmap (we'll change the pointers next). */
466	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
467	AssertRCReturn(rc, rc);
468
469	/*
470	* Restore page bitmaps
471	*/
472	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
473	{
474	if(pVM->csam.s.pPDBitmapHC[i])
475	{
476	rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC[i]);
477	if (VBOX_FAILURE(rc))
478	{
479	Log(("MMR3HyperAlloc failed with %d\n", rc));
480	return rc;
481	}
482	/* Convert to GC pointer. */
483	pVM->csam.s.pPDGCBitmapHC[i] = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC[i]);
484	Assert(pVM->csam.s.pPDGCBitmapHC[i]);
485
486	/* Restore the bitmap. */
487	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
488	AssertRCReturn(rc, rc);
489	}
490	else
491	{
492	Assert(!pVM->csam.s.pPDGCBitmapHC[i]);
493	pVM->csam.s.pPDGCBitmapHC[i] = 0;
494	}
495	}
496
497	/*
498	* Restore page records
499	*/
500	for (uint32_t i=0;i<csamInfo.savedstate.cPageRecords + csamInfo.savedstate.cPatchPageRecords;i++)
501	{
502	CSAMPAGEREC page;
503	PCSAMPAGE pPage;
504
505	rc = SSMR3GetMem(pSSM, &page, sizeof(page));
506	AssertRCReturn(rc, rc);
507
508	/*
509	* Recreate the page record
510	*/
511	pPage = csamCreatePageRecord(pVM, page.page.pPageGC, page.page.enmTag, page.page.fCode32, page.page.fMonitorInvalidation);
512	AssertReturn(pPage, VERR_NO_MEMORY);
513
514	pPage->GCPhys = page.page.GCPhys;
515	pPage->fFlags = page.page.fFlags;
516	pPage->u64Hash = page.page.u64Hash;
517
518	if (page.page.pBitmap)
519	{
520	rc = SSMR3GetMem(pSSM, pPage->pBitmap, CSAM_PAGE_BITMAP_SIZE);
521	AssertRCReturn(rc, rc);
522	}
523	else
524	{
525	MMR3HeapFree(pPage->pBitmap);
526	pPage->pBitmap = 0;
527	}
528	}
529
530	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
531	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
532	pVM->csam.s.cDangerousInstr = 0;
533	pVM->csam.s.iDangerousInstr = 0;
534	return VINF_SUCCESS;
535	}
536
537	/**
538	* Convert guest context address to host context pointer
539	*
540	* @returns VBox status code.
541	* @param pVM The VM to operate on.
542	* @param pCacheRec Address conversion cache record
543	* @param pGCPtr Guest context pointer
544	*
545	* @returns Host context pointer or NULL in case of an error
546	*
547	*/
548	static HCPTRTYPE(void ) CSAMGCVirtToHCVirt(PVM pVM, PCSAMP2GLOOKUPREC pCacheRec, GCPTRTYPE(uint8_t )pGCPtr)
549	{
550	int rc;
551	HCPTRTYPE(void *)pHCPtr;
552
553	STAM_PROFILE_START(&pVM->csam.s.StatTimeAddrConv, a);
554
555	pHCPtr = PATMR3GCPtrToHCPtr(pVM, pGCPtr);
556	if (pHCPtr) return pHCPtr;
557
558	if (pCacheRec->pPageLocStartHC)
559	{
560	uint32_t offset = pGCPtr & PAGE_OFFSET_MASK;
561	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
562	{
563	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
564	return pCacheRec->pPageLocStartHC + offset;
565	}
566	}
567
568	rc = PGMPhysGCPtr2HCPtr(pVM, pGCPtr, &pHCPtr);
569	if (rc != VINF_SUCCESS)
570	{
571	//// AssertMsgRC(rc, ("MMR3PhysGCVirt2HCVirtEx failed for %VGv\n", pGCPtr));
572	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
573	return NULL;
574	}
575	////invalid? Assert(sizeof(HCPTRTYPE(uint8_t*)) == sizeof(uint32_t));
576
577	pCacheRec->pPageLocStartHC = (HCPTRTYPE(uint8_t*))((RTHCUINTPTR)pHCPtr & PAGE_BASE_HC_MASK);
578	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
579	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
580	return pHCPtr;
581	}
582
583	/**
584	* Read callback for disassembly function; supports reading bytes that cross a page boundary
585	*
586	* @returns VBox status code.
587	* @param pSrc GC source pointer
588	* @param pDest HC destination pointer
589	* @param size Number of bytes to read
590	* @param dwUserdata Callback specific user data (pCpu)
591	*
592	*/
593	int32_t CSAMR3ReadBytes(RTHCUINTPTR pSrc, uint8_t *pDest, uint32_t size, RTHCUINTPTR dwUserdata)
594	{
595	DISCPUSTATE pCpu = (DISCPUSTATE )dwUserdata;
596	PVM pVM = (PVM)pCpu->dwUserData[0];
597	RTHCUINTPTR pInstrHC = pCpu->dwUserData[1];
598	RTGCUINTPTR pInstrGC = pCpu->dwUserData[2];
599	int orgsize = size;
600
601	Assert(sizeof(RTHCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
602	Assert(sizeof(RTGCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
603
604	/* We are not interested in patched instructions, so read the original opcode bytes. */
605	/** @note single instruction patches (int3) are checked in CSAMR3AnalyseCallback */
606	for (int i=0;i<orgsize;i++)
607	{
608	int rc = PATMR3QueryOpcode(pVM, (RTGCPTR)pSrc, pDest);
609	if (VBOX_SUCCESS(rc))
610	{
611	pSrc++;
612	pDest++;
613	size--;
614	}
615	else
616	break;
617	}
618	if (size == 0)
619	return VINF_SUCCESS;
620
621	if (PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pSrc + size - 1) && !PATMIsPatchGCAddr(pVM, pSrc))
622	{
623	return PGMPhysReadGCPtr(pVM, pDest, pSrc, size);
624	}
625	else
626	{
627	Assert(pInstrHC);
628
629	/* pInstrHC is the base address; adjust according to the GC pointer. */
630	pInstrHC = pInstrHC + (pSrc - pInstrGC);
631
632	memcpy(pDest, (void *)pInstrHC, size);
633	}
634
635	return VINF_SUCCESS;
636	}
637
638	inline bool CSAMR3DISInstr(PVM pVM, DISCPUSTATE pCpu, RTGCPTR InstrGC, uint8_t InstrHC, uint32_t pOpsize, char pszOutput)
639	{
640	(pCpu)->pfnReadBytes = CSAMR3ReadBytes;
641	(pCpu)->dwUserData[0] = (RTHCUINTPTR)pVM;
642	(pCpu)->dwUserData[1] = (RTHCUINTPTR)InstrHC;
643	(pCpu)->dwUserData[2] = (RTHCUINTPTR)InstrGC;
644	#ifdef DEBUG
645	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, OPTYPE_ALL);
646	#else
647	/* We are interested in everything except harmless stuff */
648	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, ~(OPTYPE_INVALID \| OPTYPE_HARMLESS \| OPTYPE_RRM_MASK));
649	#endif
650	}
651
652	/**
653	* Analyses the instructions following the cli for compliance with our heuristics for cli
654	*
655	* @returns VBox status code.
656	* @param pVM The VM to operate on.
657	* @param pCpu CPU disassembly state
658	* @param pInstrGC Guest context pointer to privileged instruction
659	* @param pCurInstrGC Guest context pointer to the current instruction
660	* @param pCacheRec GC to HC cache record
661	* @param pUserData User pointer (callback specific)
662	*
663	*/
664	static int CSAMR3AnalyseCallback(PVM pVM, DISCPUSTATE pCpu, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t *) pCurInstrGC,
665	PCSAMP2GLOOKUPREC pCacheRec, void *pUserData)
666	{
667	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
668	int rc;
669
670	switch(pCpu->pCurInstr->opcode)
671	{
672	case OP_INT:
673	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
674	if (pCpu->param1.parval == 3)
675	{
676	//two byte int 3
677	return VINF_SUCCESS;
678	}
679	break;
680
681	case OP_ILLUD2:
682	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue. */
683	case OP_RETN:
684	case OP_INT3:
685	case OP_INVALID:
686	#if 1
687	/* removing breaks win2k guests? */
688	case OP_IRET:
689	#endif
690	return VINF_SUCCESS;
691	}
692
693	// Check for exit points
694	switch (pCpu->pCurInstr->opcode)
695	{
696	/* It's not a good idea to patch pushf instructions:
697	* - increases the chance of conflicts (code jumping to the next instruction)
698	* - better to patch the cli
699	* - code that branches before the cli will likely hit an int 3
700	* - in general doesn't offer any benefits as we don't allow nested patch blocks (IF is always 1)
701	*/
702	case OP_PUSHF:
703	case OP_POPF:
704	break;
705
706	case OP_CLI:
707	{
708	uint32_t cbInstr = 0;
709	uint32_t opsize = pCpu->opsize;
710
711	PATMR3AddHint(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
712
713	/* Make sure the instructions that follow the cli have not been encountered before. */
714	while (true)
715	{
716	DISCPUSTATE cpu;
717	uint8_t *pCurInstrHC = 0;
718	bool disret;
719
720	if (cbInstr + opsize >= SIZEOF_NEARJUMP32)
721	break;
722
723	if (csamIsCodeScanned(pVM, pCurInstrGC + opsize, &pPage) == true)
724	{
725	/* We've scanned the next instruction(s) already. This means we've followed a branch that ended up there before -> dangerous!! */
726	PATMR3DetectConflict(pVM, pCurInstrGC, pCurInstrGC + opsize);
727	break;
728	}
729	pCurInstrGC += opsize;
730	cbInstr += opsize;
731
732	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
733	if (pCurInstrHC == NULL)
734	{
735	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
736	break;
737	}
738	Assert(VALID_PTR(pCurInstrHC));
739
740	cpu.mode = (pPage->fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
741	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
742	Assert(disret == true);
743	if (disret == false)
744	break;
745	}
746	break;
747	}
748
749	case OP_PUSH:
750	if (pCpu->pCurInstr->param1 != OP_PARM_REG_CS)
751	break;
752
753	/* no break */
754	case OP_STR:
755	case OP_LSL:
756	case OP_LAR:
757	case OP_SGDT:
758	case OP_SLDT:
759	case OP_SIDT:
760	case OP_SMSW:
761	case OP_VERW:
762	case OP_VERR:
763	case OP_CPUID:
764	case OP_IRET:
765	#ifdef DEBUG
766	switch(pCpu->pCurInstr->opcode)
767	{
768	case OP_STR:
769	Log(("Privileged instruction at %VGv: str!!\n", pCurInstrGC));
770	break;
771	case OP_LSL:
772	Log(("Privileged instruction at %VGv: lsl!!\n", pCurInstrGC));
773	break;
774	case OP_LAR:
775	Log(("Privileged instruction at %VGv: lar!!\n", pCurInstrGC));
776	break;
777	case OP_SGDT:
778	Log(("Privileged instruction at %VGv: sgdt!!\n", pCurInstrGC));
779	break;
780	case OP_SLDT:
781	Log(("Privileged instruction at %VGv: sldt!!\n", pCurInstrGC));
782	break;
783	case OP_SIDT:
784	Log(("Privileged instruction at %VGv: sidt!!\n", pCurInstrGC));
785	break;
786	case OP_SMSW:
787	Log(("Privileged instruction at %VGv: smsw!!\n", pCurInstrGC));
788	break;
789	case OP_VERW:
790	Log(("Privileged instruction at %VGv: verw!!\n", pCurInstrGC));
791	break;
792	case OP_VERR:
793	Log(("Privileged instruction at %VGv: verr!!\n", pCurInstrGC));
794	break;
795	case OP_CPUID:
796	Log(("Privileged instruction at %VGv: cpuid!!\n", pCurInstrGC));
797	break;
798	case OP_PUSH:
799	Log(("Privileged instruction at %VGv: push cs!!\n", pCurInstrGC));
800	break;
801	case OP_IRET:
802	Log(("Privileged instruction at %VGv: iret!!\n", pCurInstrGC));
803	break;
804	}
805	#endif
806
807	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
808	{
809	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
810	if (VBOX_FAILURE(rc))
811	{
812	Log(("PATMR3InstallPatch failed with %d\n", rc));
813	return VWRN_CONTINUE_ANALYSIS;
814	}
815	}
816	if (pCpu->pCurInstr->opcode == OP_IRET)
817	return VINF_SUCCESS; /* Look no further in this branch. */
818
819	return VWRN_CONTINUE_ANALYSIS;
820
821	case OP_JMP:
822	case OP_CALL:
823	{
824	// return or jump/call through a jump table
825	if (OP_PARM_VTYPE(pCpu->pCurInstr->param1) != OP_PARM_J)
826	{
827	#ifdef DEBUG
828	switch(pCpu->pCurInstr->opcode)
829	{
830	case OP_JMP:
831	Log(("Control Flow instruction at %VGv: jmp!!\n", pCurInstrGC));
832	break;
833	case OP_CALL:
834	Log(("Control Flow instruction at %VGv: call!!\n", pCurInstrGC));
835	break;
836	}
837	#endif
838	return VWRN_CONTINUE_ANALYSIS;
839	}
840	return VWRN_CONTINUE_ANALYSIS;
841	}
842
843	}
844
845	return VWRN_CONTINUE_ANALYSIS;
846	}
847
848	#ifdef CSAM_ANALYSE_BEYOND_RET
849	/**
850	* Wrapper for csamAnalyseCodeStream for call instructions.
851	*
852	* @returns VBox status code.
853	* @param pVM The VM to operate on.
854	* @param pInstrGC Guest context pointer to privileged instruction
855	* @param pCurInstrGC Guest context pointer to the current instruction
856	* @param fCode32 16 or 32 bits code
857	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
858	* @param pUserData User pointer (callback specific)
859	*
860	*/
861	static int csamAnalyseCallCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
862	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
863	{
864	int rc;
865	CSAMCALLEXITREC CallExitRec;
866	PCSAMCALLEXITREC pOldCallRec;
867	PCSAMPAGE pPage = 0;
868	uint32_t i;
869
870	CallExitRec.cInstrAfterRet = 0;
871
872	pOldCallRec = pCacheRec->pCallExitRec;
873	pCacheRec->pCallExitRec = &CallExitRec;
874
875	rc = csamAnalyseCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
876
877	for (i=0;i<CallExitRec.cInstrAfterRet;i++)
878	{
879	PCSAMPAGE pPage = 0;
880
881	pCurInstrGC = CallExitRec.pInstrAfterRetGC[i];
882
883	/* Check if we've previously encountered the instruction after the ret. */
884	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
885	{
886	DISCPUSTATE cpu;
887	uint32_t opsize;
888	uint8_t *pCurInstrHC = 0;
889	bool disret;
890	#ifdef DEBUG
891	char szOutput[256];
892	#endif
893	if (pPage == NULL)
894	{
895	/* New address; let's take a look at it. */
896	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
897	if (pPage == NULL)
898	{
899	rc = VERR_NO_MEMORY;
900	goto done;
901	}
902	}
903
904	/**
905	* Some generic requirements for recognizing an adjacent function:
906	* - alignment fillers that consist of:
907	* - nop
908	* - lea genregX, [genregX (+ 0)]
909	* - push ebp after the filler (can extend this later); aligned at at least a 4 byte boundary
910	*/
911	for (int j=0;j<16;j++)
912	{
913	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
914	if (pCurInstrHC == NULL)
915	{
916	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
917	goto done;
918	}
919	Assert(VALID_PTR(pCurInstrHC));
920
921	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
922	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
923	#ifdef DEBUG
924	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
925	if (disret == true) Log(("CSAM Call Analysis: %s", szOutput));
926	#else
927	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
928	#endif
929	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
930	if (disret == false)
931	{
932	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
933	goto done;
934	}
935
936	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
937
938	GCPTRTYPE(uint8_t *) addr = 0;
939	PCSAMPAGE pJmpPage = NULL;
940
941	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
942	{
943	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
944	{
945	/// @todo fault in the page
946	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
947	goto done;
948	}
949	//all is fine, let's continue
950	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
951	}
952
953	switch (cpu.pCurInstr->opcode)
954	{
955	case OP_NOP:
956	break; /* acceptable */
957
958	case OP_LEA:
959	/* Must be similar to:
960	*
961	* lea esi, [esi]
962	* lea esi, [esi+0]
963	* Any register is allowed as long as source and destination are identical.
964	*/
965	if ( cpu.param1.flags != USE_REG_GEN32
966	\|\| ( cpu.param2.flags != USE_REG_GEN32
967	&& ( !(cpu.param2.flags & USE_REG_GEN32)
968	\|\| !(cpu.param2.flags & (USE_DISPLACEMENT8\|USE_DISPLACEMENT16\|USE_DISPLACEMENT32))
969	\|\| cpu.param2.parval != 0
970	)
971	)
972	\|\| cpu.param1.base.reg_gen32 != cpu.param2.base.reg_gen32
973	)
974	{
975	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
976	goto next_function;
977	}
978	break;
979
980	case OP_PUSH:
981	{
982	if ( (pCurInstrGC & 0x3) != 0
983	\|\| cpu.param1.flags != USE_REG_GEN32
984	\|\| cpu.param1.base.reg_gen32 != USE_REG_EBP
985	)
986	{
987	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
988	goto next_function;
989	}
990
991	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
992	{
993	CSAMCALLEXITREC CallExitRec2;
994	CallExitRec2.cInstrAfterRet = 0;
995
996	pCacheRec->pCallExitRec = &CallExitRec2;
997
998	/* Analyse the function. */
999	Log(("Found new function at %VGv\n", pCurInstrGC));
1000	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1001	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1002	}
1003	goto next_function;
1004	}
1005
1006	case OP_SUB:
1007	{
1008	if ( (pCurInstrGC & 0x3) != 0
1009	\|\| cpu.param1.flags != USE_REG_GEN32
1010	\|\| cpu.param1.base.reg_gen32 != USE_REG_ESP
1011	)
1012	{
1013	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1014	goto next_function;
1015	}
1016
1017	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1018	{
1019	CSAMCALLEXITREC CallExitRec2;
1020	CallExitRec2.cInstrAfterRet = 0;
1021
1022	pCacheRec->pCallExitRec = &CallExitRec2;
1023
1024	/* Analyse the function. */
1025	Log(("Found new function at %VGv\n", pCurInstrGC));
1026	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1027	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1028	}
1029	goto next_function;
1030	}
1031
1032	default:
1033	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1034	goto next_function;
1035	}
1036	/* Mark it as scanned. */
1037	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1038	pCurInstrGC += opsize;
1039	} /* for at most 16 instructions */
1040	next_function:
1041	; /* MSVC complains otherwise */
1042	}
1043	}
1044	done:
1045	pCacheRec->pCallExitRec = pOldCallRec;
1046	return rc;
1047	}
1048	#else
1049	#define csamAnalyseCallCodeStream csamAnalyseCodeStream
1050	#endif
1051
1052	/**
1053	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
1054	*
1055	* @returns VBox status code.
1056	* @param pVM The VM to operate on.
1057	* @param pInstrGC Guest context pointer to privileged instruction
1058	* @param pCurInstrGC Guest context pointer to the current instruction
1059	* @param fCode32 16 or 32 bits code
1060	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1061	* @param pUserData User pointer (callback specific)
1062	*
1063	*/
1064	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1065	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1066	{
1067	DISCPUSTATE cpu;
1068	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
1069	int rc = VWRN_CONTINUE_ANALYSIS;
1070	uint32_t opsize;
1071	HCPTRTYPE(uint8_t *)pCurInstrHC = 0;
1072	bool disret;
1073
1074	#ifdef DEBUG
1075	char szOutput[256];
1076	#endif
1077
1078	LogFlow(("csamAnalyseCodeStream: code at %VGv depth=%d\n", pCurInstrGC, pCacheRec->depth));
1079
1080	pVM->csam.s.fScanningStarted = true;
1081
1082	pCacheRec->depth++;
1083	/*
1084	* Limit the call depth. (rather arbitrary upper limit; too low and we won't detect certain
1085	* cpuid instructions in Linux kernels; too high and we waste too much time scanning code)
1086	* (512 is necessary to detect cpuid instructions in Red Hat EL4; see defect 1355)
1087	* @note we are using a lot of stack here. couple of 100k when we go to the full depth (!)
1088	*/
1089	if (pCacheRec->depth > 512)
1090	{
1091	LogFlow(("CSAM: maximum calldepth reached for %VGv\n", pCurInstrGC));
1092	pCacheRec->depth--;
1093	return VINF_SUCCESS; //let's not go on forever
1094	}
1095
1096	Assert(!PATMIsPatchGCAddr(pVM, pCurInstrGC));
1097	csamR3CheckPageRecord(pVM, pCurInstrGC);
1098
1099	while(rc == VWRN_CONTINUE_ANALYSIS)
1100	{
1101	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1102	{
1103	if (pPage == NULL)
1104	{
1105	/* New address; let's take a look at it. */
1106	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1107	if (pPage == NULL)
1108	{
1109	rc = VERR_NO_MEMORY;
1110	goto done;
1111	}
1112	}
1113	}
1114	else
1115	{
1116	LogFlow(("Code at %VGv has been scanned before\n", pCurInstrGC));
1117	rc = VINF_SUCCESS;
1118	goto done;
1119	}
1120
1121	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1122	if (pCurInstrHC == NULL)
1123	{
1124	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
1125	rc = VERR_PATCHING_REFUSED;
1126	goto done;
1127	}
1128	Assert(VALID_PTR(pCurInstrHC));
1129
1130	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
1131	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1132	#ifdef DEBUG
1133	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
1134	if (disret == true) Log(("CSAM Analysis: %s", szOutput));
1135	#else
1136	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
1137	#endif
1138	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1139	if (disret == false)
1140	{
1141	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
1142	rc = VINF_SUCCESS;
1143	goto done;
1144	}
1145
1146	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
1147
1148	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1149
1150	GCPTRTYPE(uint8_t *) addr = 0;
1151	PCSAMPAGE pJmpPage = NULL;
1152
1153	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
1154	{
1155	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
1156	{
1157	/// @todo fault in the page
1158	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
1159	rc = VWRN_CONTINUE_ANALYSIS;
1160	goto next_please;
1161	}
1162	//all is fine, let's continue
1163	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
1164	}
1165	/*
1166	* If it's harmless, then don't bother checking it (the disasm tables had better be accurate!)
1167	*/
1168	if ((cpu.pCurInstr->optype & ~OPTYPE_RRM_MASK) == OPTYPE_HARMLESS)
1169	{
1170	AssertMsg(pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage) == VWRN_CONTINUE_ANALYSIS, ("Instruction incorrectly marked harmless?!?!?\n"));
1171	rc = VWRN_CONTINUE_ANALYSIS;
1172	goto next_please;
1173	}
1174
1175	#ifdef CSAM_ANALYSE_BEYOND_RET
1176	/* Remember the address of the instruction following the ret in case the parent instruction was a call. */
1177	if ( pCacheRec->pCallExitRec
1178	&& cpu.pCurInstr->opcode == OP_RETN
1179	&& pCacheRec->pCallExitRec->cInstrAfterRet < CSAM_MAX_CALLEXIT_RET)
1180	{
1181	pCacheRec->pCallExitRec->pInstrAfterRetGC[pCacheRec->pCallExitRec->cInstrAfterRet] = pCurInstrGC + opsize;
1182	pCacheRec->pCallExitRec->cInstrAfterRet++;
1183	}
1184	#endif
1185
1186	rc = pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage);
1187	if (rc == VINF_SUCCESS)
1188	goto done;
1189
1190	// For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction)
1191	if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1192	{
1193	addr = CSAMResolveBranch(&cpu, pCurInstrGC);
1194	if (addr == 0)
1195	{
1196	Log(("We don't support far jumps here!! (%08X)\n", cpu.param1.flags));
1197	rc = VINF_SUCCESS;
1198	break;
1199	}
1200	Assert(!PATMIsPatchGCAddr(pVM, addr));
1201
1202	/* If the target address lies in a patch generated jump, then special action needs to be taken. */
1203	PATMR3DetectConflict(pVM, pCurInstrGC, addr);
1204
1205	/* Same page? */
1206	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pCurInstrGC ))
1207	{
1208	if (!PGMGstIsPagePresent(pVM, addr))
1209	{
1210	Log(("Page for current instruction %VGv is not present!!\n", addr));
1211	rc = VWRN_CONTINUE_ANALYSIS;
1212	goto next_please;
1213	}
1214
1215	/* All is fine, let's continue. */
1216	csamR3CheckPageRecord(pVM, addr);
1217	}
1218
1219	pJmpPage = NULL;
1220	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1221	{
1222	if (pJmpPage == NULL)
1223	{
1224	/* New branch target; let's take a look at it. */
1225	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1226	if (pJmpPage == NULL)
1227	{
1228	rc = VERR_NO_MEMORY;
1229	goto done;
1230	}
1231	Assert(pPage);
1232	}
1233	if (cpu.pCurInstr->opcode == OP_CALL)
1234	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1235	else
1236	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1237
1238	if (rc != VINF_SUCCESS) {
1239	goto done;
1240	}
1241	}
1242	if (cpu.pCurInstr->opcode == OP_JMP)
1243	{//unconditional jump; return to caller
1244	rc = VINF_SUCCESS;
1245	goto done;
1246	}
1247
1248	rc = VWRN_CONTINUE_ANALYSIS;
1249	} //if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1250	#ifdef CSAM_SCAN_JUMP_TABLE
1251	else
1252	if ( cpu.pCurInstr->opcode == OP_JMP
1253	&& (cpu.param1.flags & (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)) == (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)
1254	)
1255	{
1256	RTGCPTR pJumpTableGC = (RTGCPTR)cpu.param1.disp32;
1257	uint8_t *pJumpTableHC;
1258	int rc2;
1259
1260	Log(("Jump through jump table\n"));
1261
1262	rc2 = PGMPhysGCPtr2HCPtr(pVM, pJumpTableGC, (PRTHCPTR)&pJumpTableHC);
1263	if (rc2 == VINF_SUCCESS)
1264	{
1265	for (uint32_t i=0;i<2;i++)
1266	{
1267	uint64_t fFlags;
1268
1269	addr = pJumpTableGC + cpu.param1.scale * i;
1270	/* Same page? */
1271	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pJumpTableGC))
1272	break;
1273
1274	addr = (RTGCPTR )(pJumpTableHC + cpu.param1.scale * i);
1275
1276	rc2 = PGMGstGetPage(pVM, addr, &fFlags, NULL);
1277	if ( rc2 != VINF_SUCCESS
1278	\|\| (fFlags & X86_PTE_US)
1279	\|\| !(fFlags & X86_PTE_P)
1280	)
1281	break;
1282
1283	Log(("Jump to %VGv\n", addr));
1284
1285	pJmpPage = NULL;
1286	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1287	{
1288	if (pJmpPage == NULL)
1289	{
1290	/* New branch target; let's take a look at it. */
1291	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1292	if (pJmpPage == NULL)
1293	{
1294	rc = VERR_NO_MEMORY;
1295	goto done;
1296	}
1297	Assert(pPage);
1298	}
1299	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1300	if (rc != VINF_SUCCESS) {
1301	goto done;
1302	}
1303	}
1304	}
1305	}
1306	}
1307	#endif
1308	if (rc != VWRN_CONTINUE_ANALYSIS) {
1309	break; //done!
1310	}
1311	next_please:
1312	if (cpu.pCurInstr->opcode == OP_JMP)
1313	{
1314	rc = VINF_SUCCESS;
1315	goto done;
1316	}
1317	pCurInstrGC += opsize;
1318	}
1319	done:
1320	pCacheRec->depth--;
1321	return rc;
1322	}
1323
1324
1325	/**
1326	* Calculates the 64 bits hash value for the current page
1327	*
1328	* @returns hash value
1329	* @param pVM The VM to operate on.
1330	* @param pInstr Page address
1331	*/
1332	uint64_t csamR3CalcPageHash(PVM pVM, RTGCPTR pInstr)
1333	{
1334	uint64_t hash = 0;
1335	uint32_t val[5];
1336	int rc;
1337
1338	Assert((pInstr & PAGE_OFFSET_MASK) == 0);
1339
1340	rc = PGMPhysReadGCPtr(pVM, &val[0], pInstr, sizeof(val[0]));
1341	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1342	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1343	{
1344	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1345	return ~0ULL;
1346	}
1347
1348	rc = PGMPhysReadGCPtr(pVM, &val[1], pInstr+1024, sizeof(val[0]));
1349	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1350	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1351	{
1352	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1353	return ~0ULL;
1354	}
1355
1356	rc = PGMPhysReadGCPtr(pVM, &val[2], pInstr+2048, sizeof(val[0]));
1357	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1358	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1359	{
1360	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1361	return ~0ULL;
1362	}
1363
1364	rc = PGMPhysReadGCPtr(pVM, &val[3], pInstr+3072, sizeof(val[0]));
1365	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1366	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1367	{
1368	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1369	return ~0ULL;
1370	}
1371
1372	rc = PGMPhysReadGCPtr(pVM, &val[4], pInstr+4092, sizeof(val[0]));
1373	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1374	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1375	{
1376	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1377	return ~0ULL;
1378	}
1379
1380	// don't want to get division by zero traps
1381	val[2] \|= 1;
1382	val[4] \|= 1;
1383
1384	hash = (uint64_t)val[0] * (uint64_t)val[1] / (uint64_t)val[2] + (val[3]%val[4]);
1385	return (hash == ~0ULL) ? hash - 1 : hash;
1386	}
1387
1388
1389	/**
1390	* Notify CSAM of a page flush
1391	*
1392	* @returns VBox status code
1393	* @param pVM The VM to operate on.
1394	* @param addr GC address of the page to flush
1395	* @param fRemovePage Page removal flag
1396	*/
1397	static int csamFlushPage(PVM pVM, RTGCPTR addr, bool fRemovePage)
1398	{
1399	PCSAMPAGEREC pPageRec;
1400	int rc;
1401	RTGCPHYS GCPhys = 0;
1402	uint64_t fFlags = 0;
1403
1404	if (!CSAMIsEnabled(pVM))
1405	return VINF_SUCCESS;
1406
1407	STAM_PROFILE_START(&pVM->csam.s.StatTimeFlushPage, a);
1408
1409	addr = addr & PAGE_BASE_GC_MASK;
1410
1411	/*
1412	* Note: searching for the page in our tree first is more expensive (skipped flushes are two orders of magnitude more common)
1413	*/
1414	if (pVM->csam.s.pPageTree == NULL)
1415	{
1416	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1417	return VWRN_CSAM_PAGE_NOT_FOUND;
1418	}
1419
1420	rc = PGMGstGetPage(pVM, addr, &fFlags, &GCPhys);
1421	/* Returned at a very early stage (no paging yet presumably). */
1422	if (rc == VERR_NOT_SUPPORTED)
1423	{
1424	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1425	return rc;
1426	}
1427
1428	if (VBOX_SUCCESS(rc))
1429	{
1430	if ( (fFlags & X86_PTE_US)
1431	\|\| rc == VERR_PGM_PHYS_PAGE_RESERVED
1432	)
1433	{
1434	/* User page -> not relevant for us. */
1435	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1436	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1437	return VINF_SUCCESS;
1438	}
1439	}
1440	else
1441	if (rc != VERR_PAGE_NOT_PRESENT && rc != VERR_PAGE_TABLE_NOT_PRESENT)
1442	AssertMsgFailed(("PGMR3GetPage %VGv failed with %Vrc\n", addr, rc));
1443
1444	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)addr);
1445	if (pPageRec)
1446	{
1447	if ( GCPhys == pPageRec->page.GCPhys
1448	&& (fFlags & X86_PTE_P))
1449	{
1450	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1451	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1452	return VINF_SUCCESS;
1453	}
1454
1455	Log(("CSAMR3FlushPage: page %VGv has changed -> FLUSH (rc=%Vrc) (Phys: %VGp vs %VGp)\n", addr, rc, GCPhys, pPageRec->page.GCPhys));
1456
1457	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushes, 1);
1458
1459	if (fRemovePage)
1460	csamRemovePageRecord(pVM, addr);
1461	else
1462	{
1463	CSAMMarkPage(pVM, addr, false);
1464	pPageRec->page.GCPhys = 0;
1465	pPageRec->page.fFlags = 0;
1466	rc = PGMGstGetPage(pVM, addr, &pPageRec->page.fFlags, &pPageRec->page.GCPhys);
1467	if (rc == VINF_SUCCESS)
1468	pPageRec->page.u64Hash = csamR3CalcPageHash(pVM, addr);
1469
1470	if (pPageRec->page.pBitmap == NULL)
1471	{
1472	pPageRec->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, CSAM_PAGE_BITMAP_SIZE);
1473	Assert(pPageRec->page.pBitmap);
1474	if (pPageRec->page.pBitmap == NULL)
1475	return VERR_NO_MEMORY;
1476	}
1477	else
1478	memset(pPageRec->page.pBitmap, 0, CSAM_PAGE_BITMAP_SIZE);
1479	}
1480
1481
1482	/*
1483	* Inform patch manager about the flush; no need to repeat the above check twice.
1484	*/
1485	PATMR3FlushPage(pVM, addr);
1486
1487	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1488	return VINF_SUCCESS;
1489	}
1490	else
1491	{
1492	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1493	return VWRN_CSAM_PAGE_NOT_FOUND;
1494	}
1495	}
1496
1497	/**
1498	* Notify CSAM of a page flush
1499	*
1500	* @returns VBox status code
1501	* @param pVM The VM to operate on.
1502	* @param addr GC address of the page to flush
1503	*/
1504	CSAMR3DECL(int) CSAMR3FlushPage(PVM pVM, RTGCPTR addr)
1505	{
1506	return csamFlushPage(pVM, addr, true /* remove page record */);
1507	}
1508
1509	/**
1510	* Check a page record in case a page has been changed
1511	*
1512	* @returns VBox status code. (trap handled or not)
1513	* @param pVM The VM to operate on.
1514	* @param pInstrGC GC instruction pointer
1515	*/
1516	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstrGC)
1517	{
1518	PCSAMPAGEREC pPageRec;
1519	uint64_t u64hash;
1520
1521	pInstrGC = pInstrGC & PAGE_BASE_GC_MASK;
1522
1523	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstrGC);
1524	if (pPageRec)
1525	{
1526	u64hash = csamR3CalcPageHash(pVM, pInstrGC);
1527	if (u64hash != pPageRec->page.u64Hash)
1528	csamFlushPage(pVM, pInstrGC, false /* don't remove page record */);
1529	}
1530	else
1531	return VWRN_CSAM_PAGE_NOT_FOUND;
1532
1533	return VINF_SUCCESS;
1534	}
1535
1536	/**
1537	* Returns monitor description based on CSAM tag
1538	*
1539	* @return description string
1540	* @param enmTag Owner tag
1541	*/
1542	const char *csamGetMonitorDescription(CSAMTAG enmTag)
1543	{
1544	if (enmTag == CSAM_TAG_PATM)
1545	return "CSAM-PATM self-modifying code monitor handler";
1546	else
1547	if (enmTag == CSAM_TAG_REM)
1548	return "CSAM-REM self-modifying code monitor handler";
1549	Assert(enmTag == CSAM_TAG_CSAM);
1550	return "CSAM self-modifying code monitor handler";
1551	}
1552
1553	/**
1554	* Adds page record to our lookup tree
1555	*
1556	* @returns CSAMPAGE ptr or NULL if failure
1557	* @param pVM The VM to operate on.
1558	* @param GCPtr Page address
1559	* @param enmTag Owner tag
1560	* @param fCode32 16 or 32 bits code
1561	* @param fMonitorInvalidation Monitor page invalidation flag
1562	*/
1563	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation)
1564	{
1565	PCSAMPAGEREC pPage;
1566	int rc;
1567	bool ret;
1568
1569	Log(("New page record for %VGv\n", GCPtr & PAGE_BASE_GC_MASK));
1570
1571	pPage = (PCSAMPAGEREC)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, sizeof(CSAMPAGEREC));
1572	if (pPage == NULL)
1573	{
1574	AssertMsgFailed(("csamCreatePageRecord: Out of memory!!!!\n"));
1575	return NULL;
1576	}
1577	/* Round down to page boundary. */
1578	GCPtr = (GCPtr & PAGE_BASE_GC_MASK);
1579	pPage->Core.Key = (AVLPVKEY)GCPtr;
1580	pPage->page.pPageGC = GCPtr;
1581	pPage->page.fCode32 = fCode32;
1582	pPage->page.fMonitorInvalidation = fMonitorInvalidation;
1583	pPage->page.enmTag = enmTag;
1584	pPage->page.fMonitorActive = false;
1585	pPage->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, PAGE_SIZE/sizeof(uint8_t));
1586	rc = PGMGstGetPage(pVM, GCPtr, &pPage->page.fFlags, &pPage->page.GCPhys);
1587	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1588
1589	pPage->page.u64Hash = csamR3CalcPageHash(pVM, GCPtr);
1590	ret = RTAvlPVInsert(&pVM->csam.s.pPageTree, &pPage->Core);
1591	Assert(ret);
1592
1593	#ifdef CSAM_MONITOR_CODE_PAGES
1594	AssertRelease(!fInCSAMCodePageInvalidate);
1595
1596	switch (enmTag)
1597	{
1598	case CSAM_TAG_PATM:
1599	case CSAM_TAG_REM:
1600	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1601	case CSAM_TAG_CSAM:
1602	#endif
1603	{
1604	int rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtr, GCPtr + (PAGE_SIZE - 1) /* inclusive! */,
1605	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1606	csamGetMonitorDescription(enmTag));
1607	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", GCPtr, rc));
1608	if (VBOX_FAILURE(rc))
1609	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", GCPtr, rc));
1610
1611	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1612
1613	/* Prefetch it in case it's not there yet. */
1614	rc = PGMPrefetchPage(pVM, GCPtr);
1615	AssertRC(rc);
1616
1617	rc = PGMShwModifyPage(pVM, GCPtr, 1, 0, ~(uint64_t)X86_PTE_RW);
1618	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1619
1620	pPage->page.fMonitorActive = true;
1621	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1622	break;
1623	}
1624	default:
1625	break; /* to shut up GCC */
1626	}
1627
1628	Log(("csamCreatePageRecord %VGv HCPhys=%VGp\n", GCPtr, pPage->page.GCPhys));
1629
1630	#ifdef VBOX_WITH_STATISTICS
1631	switch (enmTag)
1632	{
1633	case CSAM_TAG_CSAM:
1634	STAM_COUNTER_INC(&pVM->csam.s.StatPageCSAM);
1635	break;
1636	case CSAM_TAG_PATM:
1637	STAM_COUNTER_INC(&pVM->csam.s.StatPagePATM);
1638	break;
1639	case CSAM_TAG_REM:
1640	STAM_COUNTER_INC(&pVM->csam.s.StatPageREM);
1641	break;
1642	default:
1643	break; /* to shut up GCC */
1644	}
1645	#endif
1646
1647	#endif
1648
1649	STAM_COUNTER_INC(&pVM->csam.s.StatNrPages);
1650	if (fMonitorInvalidation)
1651	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1652
1653	return &pPage->page;
1654	}
1655
1656	/**
1657	* Monitors a code page (if not already monitored)
1658	*
1659	* @returns VBox status code
1660	* @param pVM The VM to operate on.
1661	* @param pPageAddrGC The page to monitor
1662	* @param enmTag Monitor tag
1663	*/
1664	CSAMR3DECL(int) CSAMR3MonitorPage(PVM pVM, RTGCPTR pPageAddrGC, CSAMTAG enmTag)
1665	{
1666	PCSAMPAGEREC pPageRec = NULL;
1667	int rc;
1668	bool fMonitorInvalidation;
1669
1670	/* Dirty pages must be handled before calling this function!. */
1671	Assert(!pVM->csam.s.cDirtyPages);
1672
1673	if (pVM->csam.s.fScanningStarted == false)
1674	return VINF_SUCCESS; /* too early */
1675
1676	pPageAddrGC &= PAGE_BASE_GC_MASK;
1677
1678	Log(("CSAMR3MonitorPage %VGv %d\n", pPageAddrGC, enmTag));
1679
1680	/** @todo implicit assumption */
1681	fMonitorInvalidation = (enmTag == CSAM_TAG_PATM);
1682
1683	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1684	if (pPageRec == NULL)
1685	{
1686	uint64_t fFlags;
1687
1688	rc = PGMGstGetPage(pVM, pPageAddrGC, &fFlags, NULL);
1689	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1690	if ( rc == VINF_SUCCESS
1691	&& (fFlags & X86_PTE_US))
1692	{
1693	/* We don't care about user pages. */
1694	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
1695	return VINF_SUCCESS;
1696	}
1697
1698	csamCreatePageRecord(pVM, pPageAddrGC, enmTag, true /* 32 bits code */, fMonitorInvalidation);
1699
1700	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1701	Assert(pPageRec);
1702	}
1703	/** @todo reference count */
1704
1705	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1706	Assert(pPageRec->page.fMonitorActive);
1707	#endif
1708
1709	#ifdef CSAM_MONITOR_CODE_PAGES
1710	if (!pPageRec->page.fMonitorActive)
1711	{
1712	Log(("CSAMR3MonitorPage: activate monitoring for %VGv\n", pPageAddrGC));
1713
1714	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, pPageAddrGC, pPageAddrGC + (PAGE_SIZE - 1) /* inclusive! */,
1715	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1716	csamGetMonitorDescription(enmTag));
1717	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", pPageAddrGC, rc));
1718	if (VBOX_FAILURE(rc))
1719	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", pPageAddrGC, rc));
1720
1721	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1722
1723	/* Prefetch it in case it's not there yet. */
1724	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1725	AssertRC(rc);
1726
1727	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1728	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1729
1730	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1731
1732	pPageRec->page.fMonitorActive = true;
1733	pPageRec->page.fMonitorInvalidation = fMonitorInvalidation;
1734	}
1735	else
1736	if ( !pPageRec->page.fMonitorInvalidation
1737	&& fMonitorInvalidation)
1738	{
1739	Assert(pPageRec->page.fMonitorActive);
1740	PGMHandlerVirtualChangeInvalidateCallback(pVM, pPageRec->page.pPageGC, CSAMCodePageInvalidate);
1741	pPageRec->page.fMonitorInvalidation = true;
1742	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1743
1744	/* Prefetch it in case it's not there yet. */
1745	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1746	AssertRC(rc);
1747
1748	/* Make sure it's readonly. Page invalidation may have modified the attributes. */
1749	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1750	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1751	}
1752
1753	#if 0 /* def VBOX_STRICT -> very annoying) */
1754	if (pPageRec->page.fMonitorActive)
1755	{
1756	uint64_t fPageShw;
1757	RTHCPHYS GCPhys;
1758	rc = PGMShwGetPage(pVM, pPageAddrGC, &fPageShw, &GCPhys);
1759	// AssertMsg( (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1760	// \|\| !(fPageShw & X86_PTE_RW)
1761	// \|\| (pPageRec->page.GCPhys == 0), ("Shadow page flags for %VGv (%VHp) aren't readonly (%VX64)!!\n", pPageAddrGC, GCPhys, fPageShw));
1762	}
1763	#endif
1764
1765	if (pPageRec->page.GCPhys == 0)
1766	{
1767	/* Prefetch it in case it's not there yet. */
1768	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1769	AssertRC(rc);
1770	/* The page was changed behind our back. It won't be made read-only until the next SyncCR3, so force it here. */
1771	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1772	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1773	}
1774	#endif /* CSAM_MONITOR_CODE_PAGES */
1775	return VINF_SUCCESS;
1776	}
1777
1778	/**
1779	* Removes a page record from our lookup tree
1780	*
1781	* @returns VBox status code
1782	* @param pVM The VM to operate on.
1783	* @param GCPtr Page address
1784	*/
1785	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr)
1786	{
1787	PCSAMPAGEREC pPageRec;
1788
1789	Log(("csamRemovePageRecord %VGv\n", GCPtr));
1790	pPageRec = (PCSAMPAGEREC)RTAvlPVRemove(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
1791
1792	if (pPageRec)
1793	{
1794	STAM_COUNTER_INC(&pVM->csam.s.StatNrRemovedPages);
1795
1796	#ifdef CSAM_MONITOR_CODE_PAGES
1797	if (pPageRec->page.fMonitorActive)
1798	{
1799	/* @todo -> this is expensive (cr3 reload)!!!
1800	* if this happens often, then reuse it instead!!!
1801	*/
1802	Assert(!fInCSAMCodePageInvalidate);
1803	STAM_COUNTER_DEC(&pVM->csam.s.StatPageMonitor);
1804	PGMHandlerVirtualDeregister(pVM, GCPtr);
1805	}
1806	if (pPageRec->page.enmTag == CSAM_TAG_PATM)
1807	{
1808	/* Make sure the recompiler flushes its cache as this page is no longer monitored. */
1809	STAM_COUNTER_INC(&pVM->csam.s.StatPageRemoveREMFlush);
1810	CPUMSetChangedFlags(pVM, CPUM_CHANGED_GLOBAL_TLB_FLUSH);
1811	}
1812	#endif
1813
1814	#ifdef VBOX_WITH_STATISTICS
1815	switch (pPageRec->page.enmTag)
1816	{
1817	case CSAM_TAG_CSAM:
1818	STAM_COUNTER_DEC(&pVM->csam.s.StatPageCSAM);
1819	break;
1820	case CSAM_TAG_PATM:
1821	STAM_COUNTER_DEC(&pVM->csam.s.StatPagePATM);
1822	break;
1823	case CSAM_TAG_REM:
1824	STAM_COUNTER_DEC(&pVM->csam.s.StatPageREM);
1825	break;
1826	default:
1827	break; /* to shut up GCC */
1828	}
1829	#endif
1830
1831	if (pPageRec->page.pBitmap) MMR3HeapFree(pPageRec->page.pBitmap);
1832	MMR3HeapFree(pPageRec);
1833	}
1834	else
1835	AssertFailed();
1836
1837	return VINF_SUCCESS;
1838	}
1839
1840	/**
1841	* Callback for delayed writes from non-EMT threads
1842	*
1843	* @param pVM VM Handle.
1844	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1845	* @param cbBuf How much it's reading/writing.
1846	*/
1847	static DECLCALLBACK(void) CSAMDelayedWriteHandler(PVM pVM, RTGCPTR GCPtr, size_t cbBuf)
1848	{
1849	int rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1850	AssertRC(rc);
1851	}
1852
1853	/**
1854	* #PF Handler callback for virtual access handler ranges.
1855	*
1856	* Important to realize that a physical page in a range can have aliases, and
1857	* for ALL and WRITE handlers these will also trigger.
1858	*
1859	* @returns VINF_SUCCESS if the handler have carried out the operation.
1860	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1861	* @param pVM VM Handle.
1862	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1863	* @param pvPtr The HC mapping of that address.
1864	* @param pvBuf What the guest is reading/writing.
1865	* @param cbBuf How much it's reading/writing.
1866	* @param enmAccessType The access type.
1867	* @param pvUser User argument.
1868	*/
1869	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1870	{
1871	int rc;
1872
1873	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1874	Log(("CSAMCodePageWriteHandler: write to %VGv size=%d\n", GCPtr, cbBuf));
1875
1876	if (VM_IS_EMT(pVM))
1877	{
1878	rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1879	}
1880	else
1881	{
1882	/* Queue the write instead otherwise we'll get concurrency issues. */
1883	/** @note in theory not correct to let it write the data first before disabling a patch!
1884	* (if it writes the same data as the patch jump and we replace it with obsolete opcodes)
1885	*/
1886	Log(("CSAMCodePageWriteHandler: delayed write!\n"));
1887	rc = VMR3ReqCallEx(pVM, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID,
1888	(PFNRT)CSAMDelayedWriteHandler, 3, pVM, GCPtr, cbBuf);
1889	}
1890	AssertRC(rc);
1891
1892	return VINF_PGM_HANDLER_DO_DEFAULT;
1893	}
1894
1895	/**
1896	* #PF Handler callback for invalidation of virtual access handler ranges.
1897	*
1898	* @param pVM VM Handle.
1899	* @param GCPtr The virtual address the guest has changed.
1900	*/
1901	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr)
1902	{
1903	fInCSAMCodePageInvalidate = true;
1904	LogFlow(("CSAMCodePageInvalidate %VGv\n", GCPtr));
1905	/** @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. */
1906	csamFlushPage(pVM, GCPtr, false /* don't remove page! */);
1907	fInCSAMCodePageInvalidate = false;
1908	return VINF_SUCCESS;
1909	}
1910
1911	/**
1912	* Check if the current instruction has already been checked before
1913	*
1914	* @returns VBox status code. (trap handled or not)
1915	* @param pVM The VM to operate on.
1916	* @param pInstr Instruction pointer
1917	* @param pPage CSAM patch structure pointer
1918	*/
1919	bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage)
1920	{
1921	PCSAMPAGEREC pPageRec;
1922	uint32_t offset;
1923
1924	STAM_PROFILE_START(&pVM->csam.s.StatTimeCheckAddr, a);
1925
1926	offset = pInstr & PAGE_OFFSET_MASK;
1927	pInstr = pInstr & PAGE_BASE_GC_MASK;
1928
1929	Assert(pPage);
1930
1931	if (pPage && (pPage)->pPageGC == pInstr)
1932	{
1933	if ((pPage)->pBitmap == NULL \|\| ASMBitTest((pPage)->pBitmap, offset))
1934	{
1935	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1936	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1937	return true;
1938	}
1939	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1940	return false;
1941	}
1942
1943	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstr);
1944	if (pPageRec)
1945	{
1946	if (pPage) *pPage= &pPageRec->page;
1947	if (pPageRec->page.pBitmap == NULL \|\| ASMBitTest(pPageRec->page.pBitmap, offset))
1948	{
1949	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1950	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1951	return true;
1952	}
1953	}
1954	else
1955	{
1956	if (pPage) *pPage = NULL;
1957	}
1958	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1959	return false;
1960	}
1961
1962	/**
1963	* Mark an instruction in a page as scanned/not scanned
1964	*
1965	* @param pVM The VM to operate on.
1966	* @param pPage Patch structure pointer
1967	* @param pInstr Instruction pointer
1968	* @param opsize Instruction size
1969	* @param fScanned Mark as scanned or not
1970	*/
1971	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
1972	{
1973	LogFlow(("csamMarkCodeAsScanned %VGv opsize=%d\n", pInstr, opsize));
1974	CSAMMarkPage(pVM, pInstr, fScanned);
1975
1976	/** @todo should recreate empty bitmap if !fScanned */
1977	if (pPage->pBitmap == NULL)
1978	return;
1979
1980	if (fScanned)
1981	{
1982	// retn instructions can be scanned more than once
1983	if (ASMBitTest(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK) == 0)
1984	{
1985	pPage->uSize += opsize;
1986	STAM_COUNTER_ADD(&pVM->csam.s.StatNrInstr, 1);
1987	}
1988	if (pPage->uSize >= PAGE_SIZE)
1989	{
1990	Log(("Scanned full page (%VGv) -> free bitmap\n", pInstr & PAGE_BASE_GC_MASK));
1991	MMR3HeapFree(pPage->pBitmap);
1992	pPage->pBitmap = NULL;
1993	}
1994	else
1995	ASMBitSet(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
1996	}
1997	else
1998	ASMBitClear(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
1999	}
2000
2001	/**
2002	* Mark an instruction in a page as scanned/not scanned
2003	*
2004	* @returns VBox status code.
2005	* @param pVM The VM to operate on.
2006	* @param pInstr Instruction pointer
2007	* @param opsize Instruction size
2008	* @param fScanned Mark as scanned or not
2009	*/
2010	CSAMDECL(int) CSAMR3MarkCode(PVM pVM, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
2011	{
2012	PCSAMPAGE pPage = 0;
2013
2014	Assert(!fScanned); /* other case not implemented. */
2015	Assert(!PATMIsPatchGCAddr(pVM, pInstr));
2016
2017	if (csamIsCodeScanned(pVM, pInstr, &pPage) == false)
2018	{
2019	Assert(fScanned == true); /* other case should not be possible */
2020	return VINF_SUCCESS;
2021	}
2022
2023	Log(("CSAMR3MarkCode: %VGv size=%d fScanned=%d\n", pInstr, opsize, fScanned));
2024	csamMarkCode(pVM, pPage, pInstr, opsize, fScanned);
2025	return VINF_SUCCESS;
2026	}
2027
2028
2029	/**
2030	* Scan and analyse code
2031	*
2032	* @returns VBox status code.
2033	* @param pVM The VM to operate on.
2034	* @param Sel selector
2035	* @param pHiddenSel The hidden selector register.
2036	* @param pInstrGC Instruction pointer
2037	*/
2038	CSAMR3DECL(int) CSAMR3CheckCodeEx(PVM pVM, RTSEL Sel, CPUMSELREGHID *pHiddenSel, RTGCPTR pInstrGC)
2039	{
2040	PCSAMPAGE pPage = NULL;
2041
2042	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2043	{
2044	// No use
2045	return VINF_SUCCESS;
2046	}
2047
2048	if (CSAMIsEnabled(pVM))
2049	{
2050	bool fCode32 = SELMIsSelector32Bit(pVM, Sel, pHiddenSel);
2051
2052	//assuming 32 bits code for now
2053	Assert(fCode32);
2054
2055	pInstrGC = SELMToFlat(pVM, Sel, pHiddenSel, pInstrGC);
2056
2057	return CSAMR3CheckCode(pVM, pInstrGC);
2058	}
2059	return VINF_SUCCESS;
2060	}
2061
2062	/**
2063	* Scan and analyse code
2064	*
2065	* @returns VBox status code.
2066	* @param pVM The VM to operate on.
2067	* @param pInstrGC Instruction pointer (0:32 virtual address)
2068	*/
2069	CSAMR3DECL(int) CSAMR3CheckCode(PVM pVM, RTGCPTR pInstrGC)
2070	{
2071	int rc;
2072	PCSAMPAGE pPage = NULL;
2073
2074	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2075	{
2076	// No use
2077	return VINF_SUCCESS;
2078	}
2079
2080	if (CSAMIsEnabled(pVM))
2081	{
2082	// Cache record for PATMGCVirtToHCVirt
2083	CSAMP2GLOOKUPREC cacheRec = {0};
2084
2085	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2086	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, pInstrGC, true /* 32 bits code */, CSAMR3AnalyseCallback, pPage, &cacheRec);
2087	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2088	if (rc != VINF_SUCCESS)
2089	{
2090	Log(("csamAnalyseCodeStream failed with %d\n", rc));
2091	return rc;
2092	}
2093	}
2094	return VINF_SUCCESS;
2095	}
2096
2097	/**
2098	* Flush dirty code pages
2099	*
2100	* @returns VBox status code.
2101	* @param pVM The VM to operate on.
2102	*/
2103	CSAMR3DECL(int) CSAMR3FlushDirtyPages(PVM pVM)
2104	{
2105	STAM_PROFILE_START(&pVM->csam.s.StatFlushDirtyPages, a);
2106
2107	for (uint32_t i=0;i<pVM->csam.s.cDirtyPages;i++)
2108	{
2109	int rc;
2110	PCSAMPAGEREC pPageRec;
2111	RTGCPTR GCPtr = pVM->csam.s.pvDirtyBasePage[i];
2112
2113	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2114
2115	/* Notify the recompiler that this page has been changed. */
2116	REMR3NotifyCodePageChanged(pVM, GCPtr);
2117
2118	/* Enable write protection again. (use the fault address as it might be an alias) */
2119	rc = PGMShwModifyPage(pVM, pVM->csam.s.pvDirtyFaultPage[i], 1, 0, ~(uint64_t)X86_PTE_RW);
2120	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2121
2122	Log(("CSAMR3FlushDirtyPages: flush %VGv (modifypage rc=%Vrc)\n", pVM->csam.s.pvDirtyBasePage[i], rc));
2123
2124	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
2125	if (pPageRec && pPageRec->page.enmTag == CSAM_TAG_REM)
2126	{
2127	uint64_t fFlags;
2128
2129	rc = PGMGstGetPage(pVM, GCPtr, &fFlags, NULL);
2130	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
2131	if ( rc == VINF_SUCCESS
2132	&& (fFlags & X86_PTE_US))
2133	{
2134	/* We don't care about user pages. */
2135	csamRemovePageRecord(pVM, GCPtr);
2136	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
2137	}
2138	}
2139	}
2140	pVM->csam.s.cDirtyPages = 0;
2141	VM_FF_CLEAR(pVM, VM_FF_CSAM_FLUSH_DIRTY_PAGE);
2142	STAM_PROFILE_STOP(&pVM->csam.s.StatFlushDirtyPages, a);
2143	return VINF_SUCCESS;
2144	}
2145
2146	/**
2147	* Analyse interrupt and trap gates
2148	*
2149	* @returns VBox status code.
2150	* @param pVM The VM to operate on.
2151	* @param iGate Start gate
2152	* @param cGates Number of gates to check
2153	*/
2154	CSAMR3DECL(int) CSAMR3CheckGates(PVM pVM, uint32_t iGate, uint32_t cGates)
2155	{
2156	uint16_t cbIDT;
2157	RTGCPTR GCPtrIDT = CPUMGetGuestIDTR(pVM, &cbIDT);
2158	uint32_t iGateEnd;
2159	uint32_t maxGates;
2160	VBOXIDTE aIDT[256];
2161	PVBOXIDTE pGuestIdte;
2162	int rc;
2163
2164	if (EMIsRawRing0Enabled(pVM) == false)
2165	{
2166	/* Enabling interrupt gates only works when raw ring 0 is enabled. */
2167	//AssertFailed();
2168	return VINF_SUCCESS;
2169	}
2170
2171	/* We only check all gates once during a session */
2172	if ( !pVM->csam.s.fGatesChecked
2173	&& cGates != 256)
2174	return VINF_SUCCESS; /* too early */
2175
2176	/* We only check all gates once during a session */
2177	if ( pVM->csam.s.fGatesChecked
2178	&& cGates != 1)
2179	return VINF_SUCCESS; /* ignored */
2180
2181	if (cGates != 1)
2182	pVM->csam.s.fGatesChecked = true;
2183
2184	Assert(GCPtrIDT && cGates <= 256);
2185	if (!GCPtrIDT \|\| cGates > 256)
2186	return VERR_INVALID_PARAMETER;
2187
2188	/* Determine valid upper boundary. */
2189	maxGates = (cbIDT+1) / sizeof(VBOXIDTE);
2190	Assert(iGate < maxGates);
2191	if (iGate > maxGates)
2192	return VERR_INVALID_PARAMETER;
2193
2194	if (iGate + cGates > maxGates)
2195	cGates = maxGates - iGate;
2196
2197	GCPtrIDT = GCPtrIDT + iGate * sizeof(VBOXIDTE);
2198	iGateEnd = iGate + cGates;
2199
2200	STAM_PROFILE_START(&pVM->csam.s.StatCheckGates, a);
2201
2202	/*
2203	* Get IDT entries.
2204	*/
2205	if (PAGE_ADDRESS(GCPtrIDT) == PAGE_ADDRESS(GCPtrIDT+cGates*sizeof(VBOXIDTE)))
2206	{
2207	/* Just convert the IDT address to a HC pointer. The whole IDT fits in one page. */
2208	rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrIDT, (PRTHCPTR)&pGuestIdte);
2209	if (VBOX_FAILURE(rc))
2210	{
2211	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2212	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2213	return rc;
2214	}
2215	}
2216	else
2217	{
2218	/* Slow method when it crosses a page boundary. */
2219	rc = PGMPhysReadGCPtr(pVM, aIDT, GCPtrIDT, cGates*sizeof(VBOXIDTE));
2220	if (VBOX_FAILURE(rc))
2221	{
2222	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2223	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2224	return rc;
2225	}
2226	pGuestIdte = &aIDT[0];
2227	}
2228
2229	for (/iGate/; iGate<iGateEnd; iGate++, pGuestIdte++)
2230	{
2231	Assert(TRPMR3GetGuestTrapHandler(pVM, iGate) == TRPM_INVALID_HANDLER);
2232
2233	if ( pGuestIdte->Gen.u1Present
2234	&& (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
2235	&& (pGuestIdte->Gen.u2DPL == 3 \|\| pGuestIdte->Gen.u2DPL == 0)
2236	)
2237	{
2238	RTGCPTR pHandler;
2239	CSAMP2GLOOKUPREC cacheRec = {0}; /* Cache record for PATMGCVirtToHCVirt. */
2240	PCSAMPAGE pPage = NULL;
2241
2242	pHandler = (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow;
2243	pHandler = SELMToFlat(pVM, pGuestIdte->Gen.u16SegSel, 0, pHandler);
2244
2245	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2246	{
2247	Log(("CSAMCheckGates: check trap gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2248	}
2249	else
2250	{
2251	Log(("CSAMCheckGates: check interrupt gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2252	}
2253
2254	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2255	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2256	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2257	if (rc != VINF_SUCCESS)
2258	{
2259	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2260	continue;
2261	}
2262	/* OpenBSD guest specific patch test. */
2263	if (iGate >= 0x20)
2264	{
2265	PCPUMCTX pCtx;
2266	DISCPUSTATE cpu;
2267	RTGCUINTPTR aOpenBsdPushCSOffset[3] = {0x03, /* OpenBSD 3.7 & 3.8 */
2268	0x2B, /* OpenBSD 4.0 installation ISO */
2269	0x2F}; /* OpenBSD 4.0 after install */
2270
2271	rc = CPUMQueryGuestCtxPtr(pVM, &pCtx);
2272	AssertRC(rc); /* can't fail */
2273
2274	for (int i=0;i<ELEMENTS(aOpenBsdPushCSOffset);i++)
2275	{
2276	rc = CPUMR3DisasmInstrCPU(pVM, pCtx, pHandler - aOpenBsdPushCSOffset[i], &cpu, NULL);
2277	if ( rc == VINF_SUCCESS
2278	&& cpu.pCurInstr->opcode == OP_PUSH
2279	&& cpu.pCurInstr->param1 == OP_PARM_REG_CS)
2280	{
2281	rc = PATMR3InstallPatch(pVM, pHandler - aOpenBsdPushCSOffset[i], PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2282	if (VBOX_SUCCESS(rc))
2283	Log(("Installed OpenBSD interrupt handler prefix instruction (push cs) patch\n"));
2284	}
2285	}
2286	}
2287
2288	/* Trap gates and certain interrupt gates. */
2289	uint32_t fPatchFlags = PATMFL_CODE32 \| PATMFL_IDTHANDLER;
2290
2291	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2292	fPatchFlags \|= PATMFL_TRAPHANDLER;
2293	else
2294	fPatchFlags \|= PATMFL_INTHANDLER;
2295
2296	switch (iGate) {
2297	case 8:
2298	case 10:
2299	case 11:
2300	case 12:
2301	case 13:
2302	case 14:
2303	case 17:
2304	fPatchFlags \|= PATMFL_TRAPHANDLER_WITH_ERRORCODE;
2305	break;
2306	default:
2307	/* No error code. */
2308	break;
2309	}
2310
2311	Log(("Installing %s gate handler for 0x%X at %VGv\n", (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32) ? "trap" : "intr", iGate, pHandler));
2312
2313	rc = PATMR3InstallPatch(pVM, pHandler, fPatchFlags);
2314	if (VBOX_SUCCESS(rc) \|\| rc == VERR_PATM_ALREADY_PATCHED)
2315	{
2316	Log(("Gate handler 0x%X is SAFE!\n", iGate));
2317
2318	RTGCPTR pNewHandlerGC = PATMR3QueryPatchGCPtr(pVM, pHandler);
2319	if (pNewHandlerGC)
2320	{
2321	rc = TRPMR3SetGuestTrapHandler(pVM, iGate, pNewHandlerGC);
2322	if (VBOX_FAILURE(rc))
2323	Log(("TRPMR3SetGuestTrapHandler %d failed with %Vrc\n", iGate, rc));
2324	}
2325	}
2326	}
2327	} /* for */
2328	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2329	return VINF_SUCCESS;
2330	}
2331
2332	/**
2333	* Query CSAM state (enabled/disabled)
2334	*
2335	* @returns 0 - disabled, 1 - enabled
2336	* @param pVM The VM to operate on.
2337	*/
2338	CSAMR3DECL(int) CSAMR3IsEnabled(PVM pVM)
2339	{
2340	return pVM->fCSAMEnabled;
2341	}
2342
2343	#ifdef VBOX_WITH_DEBUGGER
2344	/**
2345	* The '.csamoff' command.
2346	*
2347	* @returns VBox status.
2348	* @param pCmd Pointer to the command descriptor (as registered).
2349	* @param pCmdHlp Pointer to command helper functions.
2350	* @param pVM Pointer to the current VM (if any).
2351	* @param paArgs Pointer to (readonly) array of arguments.
2352	* @param cArgs Number of arguments in the array.
2353	*/
2354	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2355	{
2356	/*
2357	* Validate input.
2358	*/
2359	if (!pVM)
2360	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2361
2362	CSAMDisableScanning(pVM);
2363	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning disabled\n");
2364	}
2365
2366	/**
2367	* The '.csamon' command.
2368	*
2369	* @returns VBox status.
2370	* @param pCmd Pointer to the command descriptor (as registered).
2371	* @param pCmdHlp Pointer to command helper functions.
2372	* @param pVM Pointer to the current VM (if any).
2373	* @param paArgs Pointer to (readonly) array of arguments.
2374	* @param cArgs Number of arguments in the array.
2375	*/
2376	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2377	{
2378	/*
2379	* Validate input.
2380	*/
2381	if (!pVM)
2382	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2383
2384	CSAMEnableScanning(pVM);
2385	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning enabled\n");
2386	}
2387	#endif

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source: vbox/trunk/src/VBox/VMM/PATM/CSAM.cpp@ 1086

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