CSAM.cpp@ 12329

Last change on this file since 12329 was 11792, checked in by vboxsync, 16 years ago
Assert when the SSM version doesn't match.
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File size: 89.8 KB

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1	/* $Id: CSAM.cpp 11792 2008-08-29 08:51:20Z vboxsync $ */
2	/** @file
3	* CSAM - Guest OS Code Scanning and Analysis Manager
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
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	/* Enable to scan beyond ret instructions.
66	#define CSAM_ANALYSE_BEYOND_RET */
67
68	/*******************************************************************************
69	* Internal Functions *
70	*******************************************************************************/
71	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM);
72	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
73	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
74	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr);
75
76	bool csamIsCodeScanned(PVM pVM, RTRCPTR pInstr, PCSAMPAGE *pPage);
77	int csamR3CheckPageRecord(PVM pVM, RTRCPTR pInstr);
78	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTRCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
79	static int csamRemovePageRecord(PVM pVM, RTRCPTR GCPtr);
80	static int csamReinit(PVM pVM);
81	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTRCPTR pInstr, uint32_t opsize, bool fScanned);
82	static int csamAnalyseCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
83	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec);
84
85	/** @todo Temporary for debugging. */
86	static bool fInCSAMCodePageInvalidate = false;
87
88	/*******************************************************************************
89	* Global Variables *
90	*******************************************************************************/
91	#ifdef VBOX_WITH_DEBUGGER
92	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
93	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
94
95	/** Command descriptors. */
96	static const DBGCCMD g_aCmds[] =
97	{
98	/* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, pResultDesc, fFlags, pfnHandler pszSyntax, ....pszDescription */
99	{ "csamon", 0, 0, NULL, 0, NULL, 0, csamr3CmdOn, "", "Enable CSAM code scanning." },
100	{ "csamoff", 0, 0, NULL, 0, NULL, 0, csamr3CmdOff, "", "Disable CSAM code scanning." },
101	};
102	#endif
103
104
105	/**
106	* Initializes the CSAM.
107	*
108	* @returns VBox status code.
109	* @param pVM The VM to operate on.
110	*/
111	CSAMR3DECL(int) CSAMR3Init(PVM pVM)
112	{
113	int rc;
114
115	LogFlow(("CSAMR3Init\n"));
116
117	/* Allocate bitmap for the page directory. */
118	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTHCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDBitmapHC);
119	AssertRCReturn(rc, rc);
120	rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKSsizeof(RTRCPTR), 0, MM_TAG_CSAM, (void *)&pVM->csam.s.pPDGCBitmapHC);
121	AssertRCReturn(rc, rc);
122	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
123	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
124
125	rc = csamReinit(pVM);
126	AssertRCReturn(rc, rc);
127
128	/*
129	* Register save and load state notificators.
130	*/
131	rc = SSMR3RegisterInternal(pVM, "CSAM", 0, CSAM_SSM_VERSION, sizeof(pVM->csam.s) + PAGE_SIZE*16,
132	NULL, csamr3Save, NULL,
133	NULL, csamr3Load, NULL);
134	AssertRCReturn(rc, rc);
135
136	STAM_REG(pVM, &pVM->csam.s.StatNrTraps, STAMTYPE_COUNTER, "/CSAM/PageTraps", STAMUNIT_OCCURENCES, "The number of CSAM page traps.");
137	STAM_REG(pVM, &pVM->csam.s.StatDangerousWrite, STAMTYPE_COUNTER, "/CSAM/DangerousWrites", STAMUNIT_OCCURENCES, "The number of dangerous writes that cause a context switch.");
138
139	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPHC, STAMTYPE_COUNTER, "/CSAM/HC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
140	STAM_REG(pVM, &pVM->csam.s.StatNrPageNPGC, STAMTYPE_COUNTER, "/CSAM/GC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
141	STAM_REG(pVM, &pVM->csam.s.StatNrPages, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRW", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW monitoring).");
142	STAM_REG(pVM, &pVM->csam.s.StatNrPagesInv, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRWI", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW & invalidation monitoring).");
143	STAM_REG(pVM, &pVM->csam.s.StatNrRemovedPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Removed", STAMUNIT_OCCURENCES, "The number of removed CSAM page records.");
144	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.");
145
146	STAM_REG(pVM, &pVM->csam.s.StatNrPatchPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Patch", STAMUNIT_OCCURENCES, "The number of CSAM patch page records.");
147	STAM_REG(pVM, &pVM->csam.s.StatNrUserPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Ignore/User", STAMUNIT_OCCURENCES, "The number of CSAM user page records (ignored).");
148	STAM_REG(pVM, &pVM->csam.s.StatPagePATM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/PATM", STAMUNIT_OCCURENCES, "The number of PATM page records.");
149	STAM_REG(pVM, &pVM->csam.s.StatPageCSAM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/CSAM", STAMUNIT_OCCURENCES, "The number of CSAM page records.");
150	STAM_REG(pVM, &pVM->csam.s.StatPageREM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/REM", STAMUNIT_OCCURENCES, "The number of REM page records.");
151	STAM_REG(pVM, &pVM->csam.s.StatPageMonitor, STAMTYPE_COUNTER, "/CSAM/PageRec/Monitored", STAMUNIT_OCCURENCES, "The number of monitored pages.");
152
153	STAM_REG(pVM, &pVM->csam.s.StatCodePageModified, STAMTYPE_COUNTER, "/CSAM/Monitor/DirtyPage", STAMUNIT_OCCURENCES, "The number of code page modifications.");
154
155	STAM_REG(pVM, &pVM->csam.s.StatNrFlushes, STAMTYPE_COUNTER, "/CSAM/PageFlushes", STAMUNIT_OCCURENCES, "The number of CSAM page flushes.");
156	STAM_REG(pVM, &pVM->csam.s.StatNrFlushesSkipped, STAMTYPE_COUNTER, "/CSAM/PageFlushesSkipped", STAMUNIT_OCCURENCES, "The number of CSAM page flushes that were skipped.");
157	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesHC, STAMTYPE_COUNTER, "/CSAM/HC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
158	STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesGC, STAMTYPE_COUNTER, "/CSAM/GC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
159	STAM_REG(pVM, &pVM->csam.s.StatNrInstr, STAMTYPE_COUNTER, "/CSAM/ScannedInstr", STAMUNIT_OCCURENCES, "The number of scanned instructions.");
160	STAM_REG(pVM, &pVM->csam.s.StatNrBytesRead, STAMTYPE_COUNTER, "/CSAM/BytesRead", STAMUNIT_OCCURENCES, "The number of bytes read for scanning.");
161	STAM_REG(pVM, &pVM->csam.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/CSAM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
162
163	STAM_REG(pVM, &pVM->csam.s.StatBitmapAlloc, STAMTYPE_COUNTER, "/CSAM/Alloc/PageBitmap", STAMUNIT_OCCURENCES, "The number of page bitmap allocations.");
164
165	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheHit, STAMTYPE_COUNTER, "/CSAM/Cache/Hit", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache hits.");
166	STAM_REG(pVM, &pVM->csam.s.StatInstrCacheMiss, STAMTYPE_COUNTER, "/CSAM/Cache/Miss", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache misses.");
167
168	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunction, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Success", STAMUNIT_OCCURENCES, "The number of found functions beyond the ret border.");
169	STAM_REG(pVM, &pVM->csam.s.StatScanNextFunctionFailed, STAMTYPE_COUNTER, "/CSAM/Function/Scan/Failed", STAMUNIT_OCCURENCES, "The number of refused functions beyond the ret border.");
170
171	STAM_REG(pVM, &pVM->csam.s.StatTime, STAMTYPE_PROFILE, "/PROF/CSAM/Scan", STAMUNIT_TICKS_PER_CALL, "Scanning overhead.");
172	STAM_REG(pVM, &pVM->csam.s.StatTimeCheckAddr, STAMTYPE_PROFILE, "/PROF/CSAM/CheckAddr", STAMUNIT_TICKS_PER_CALL, "Address check overhead.");
173	STAM_REG(pVM, &pVM->csam.s.StatTimeAddrConv, STAMTYPE_PROFILE, "/PROF/CSAM/AddrConv", STAMUNIT_TICKS_PER_CALL, "Address conversion overhead.");
174	STAM_REG(pVM, &pVM->csam.s.StatTimeFlushPage, STAMTYPE_PROFILE, "/PROF/CSAM/FlushPage", STAMUNIT_TICKS_PER_CALL, "Page flushing overhead.");
175	STAM_REG(pVM, &pVM->csam.s.StatTimeDisasm, STAMTYPE_PROFILE, "/PROF/CSAM/Disasm", STAMUNIT_TICKS_PER_CALL, "Disassembly overhead.");
176	STAM_REG(pVM, &pVM->csam.s.StatFlushDirtyPages, STAMTYPE_PROFILE, "/PROF/CSAM/FlushDirtyPage", STAMUNIT_TICKS_PER_CALL, "Dirty page flushing overhead.");
177	STAM_REG(pVM, &pVM->csam.s.StatCheckGates, STAMTYPE_PROFILE, "/PROF/CSAM/CheckGates", STAMUNIT_TICKS_PER_CALL, "CSAMR3CheckGates overhead.");
178
179	/*
180	* Check CFGM option and enable/disable CSAM.
181	*/
182	bool fEnabled;
183	rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "CSAMEnabled", &fEnabled);
184	if (VBOX_FAILURE(rc))
185	#ifdef CSAM_ENABLE
186	fEnabled = true;
187	#else
188	fEnabled = false;
189	#endif
190	if (fEnabled)
191	CSAMEnableScanning(pVM);
192
193	#ifdef VBOX_WITH_DEBUGGER
194	/*
195	* Debugger commands.
196	*/
197	static bool fRegisteredCmds = false;
198	if (!fRegisteredCmds)
199	{
200	int rc = DBGCRegisterCommands(&g_aCmds[0], RT_ELEMENTS(g_aCmds));
201	if (VBOX_SUCCESS(rc))
202	fRegisteredCmds = true;
203	}
204	#endif
205
206	return VINF_SUCCESS;
207	}
208
209	/**
210	* (Re)initializes CSAM
211	*
212	* @param pVM The VM.
213	*/
214	static int csamReinit(PVM pVM)
215	{
216	/*
217	* Assert alignment and sizes.
218	*/
219	AssertRelease(!(RT_OFFSETOF(VM, csam.s) & 31));
220	AssertRelease(sizeof(pVM->csam.s) <= sizeof(pVM->csam.padding));
221
222	/*
223	* Setup any fixed pointers and offsets.
224	*/
225	pVM->csam.s.offVM = RT_OFFSETOF(VM, patm);
226
227	pVM->csam.s.fGatesChecked = false;
228	pVM->csam.s.fScanningStarted = false;
229
230	VM_FF_CLEAR(pVM, VM_FF_CSAM_PENDING_ACTION);
231	pVM->csam.s.cDirtyPages = 0;
232	/* not necessary */
233	memset(pVM->csam.s.pvDirtyBasePage, 0, sizeof(pVM->csam.s.pvDirtyBasePage));
234	memset(pVM->csam.s.pvDirtyFaultPage, 0, sizeof(pVM->csam.s.pvDirtyFaultPage));
235
236	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
237	pVM->csam.s.cDangerousInstr = 0;
238	pVM->csam.s.iDangerousInstr = 0;
239
240	memset(pVM->csam.s.pvCallInstruction, 0, sizeof(pVM->csam.s.pvCallInstruction));
241	pVM->csam.s.iCallInstruction = 0;
242
243	/** @note never mess with the pgdir bitmap here! */
244	return VINF_SUCCESS;
245	}
246
247	/**
248	* Applies relocations to data and code managed by this
249	* component. This function will be called at init and
250	* whenever the VMM need to relocate itself inside the GC.
251	*
252	* The csam will update the addresses used by the switcher.
253	*
254	* @param pVM The VM.
255	* @param offDelta Relocation delta.
256	*/
257	CSAMR3DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
258	{
259	if (offDelta)
260	{
261	/* Adjust pgdir and page bitmap pointers. */
262	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
263	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
264
265	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
266	{
267	if (pVM->csam.s.pPDGCBitmapHC[i])
268	{
269	pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
270	}
271	}
272	}
273	return;
274	}
275
276	/**
277	* Terminates the csam.
278	*
279	* Termination means cleaning up and freeing all resources,
280	* the VM it self is at this point powered off or suspended.
281	*
282	* @returns VBox status code.
283	* @param pVM The VM to operate on.
284	*/
285	CSAMR3DECL(int) CSAMR3Term(PVM pVM)
286	{
287	int rc;
288
289	rc = CSAMR3Reset(pVM);
290	AssertRC(rc);
291
292	/* @todo triggers assertion in MMHyperFree */
293	#if 0
294	for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
295	{
296	if (pVM->csam.s.pPDBitmapHC[i])
297	MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
298	}
299	#endif
300
301	return VINF_SUCCESS;
302	}
303
304	/**
305	* CSAM reset callback.
306	*
307	* @returns VBox status code.
308	* @param pVM The VM which is reset.
309	*/
310	CSAMR3DECL(int) CSAMR3Reset(PVM pVM)
311	{
312	/* Clear page bitmaps. */
313	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
314	{
315	if (pVM->csam.s.pPDBitmapHC[i])
316	{
317	Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
318	ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
319	}
320	}
321
322	/* Remove all CSAM page records. */
323	while(true)
324	{
325	PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
326	if (pPageRec)
327	{
328	csamRemovePageRecord(pVM, pPageRec->page.pPageGC);
329	}
330	else
331	break;
332	}
333	Assert(!pVM->csam.s.pPageTree);
334
335	csamReinit(pVM);
336
337	return VINF_SUCCESS;
338	}
339
340	#define CSAM_SUBTRACT_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) - (uintptr_t)(b)
341	#define CSAM_ADD_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) + (uintptr_t)(b)
342
343
344	/**
345	* Callback function for RTAvlPVDoWithAll
346	*
347	* Counts the number of records in the tree
348	*
349	* @returns VBox status code.
350	* @param pNode Current node
351	* @param pcPatches Pointer to patch counter
352	*/
353	static DECLCALLBACK(int) CountRecord(PAVLPVNODECORE pNode, void *pcPatches)
354	{
355	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
356	return VINF_SUCCESS;
357	}
358
359	/**
360	* Callback function for RTAvlPVDoWithAll
361	*
362	* Saves the state of the page record
363	*
364	* @returns VBox status code.
365	* @param pNode Current node
366	* @param pVM1 VM Handle
367	*/
368	static DECLCALLBACK(int) SavePageState(PAVLPVNODECORE pNode, void *pVM1)
369	{
370	PVM pVM = (PVM)pVM1;
371	PCSAMPAGEREC pPage = (PCSAMPAGEREC)pNode;
372	CSAMPAGEREC page = *pPage;
373	PSSMHANDLE pSSM = pVM->csam.s.savedstate.pSSM;
374	int rc;
375
376	/* Save the page record itself */
377	rc = SSMR3PutMem(pSSM, &page, sizeof(page));
378	AssertRCReturn(rc, rc);
379
380	if (page.page.pBitmap)
381	{
382	rc = SSMR3PutMem(pSSM, page.page.pBitmap, CSAM_PAGE_BITMAP_SIZE);
383	AssertRCReturn(rc, rc);
384	}
385
386	return VINF_SUCCESS;
387	}
388
389	/**
390	* Execute state save operation.
391	*
392	* @returns VBox status code.
393	* @param pVM VM Handle.
394	* @param pSSM SSM operation handle.
395	*/
396	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM)
397	{
398	CSAM csamInfo = pVM->csam.s;
399	int rc;
400
401	/*
402	* Count the number of page records in the tree (feeling lazy)
403	*/
404	csamInfo.savedstate.cPageRecords = 0;
405	RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, CountRecord, &csamInfo.savedstate.cPageRecords);
406
407	/*
408	* Save CSAM structure
409	*/
410	pVM->csam.s.savedstate.pSSM = pSSM;
411	rc = SSMR3PutMem(pSSM, &csamInfo, sizeof(csamInfo));
412	AssertRCReturn(rc, rc);
413
414	/* Save pgdir bitmap */
415	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
416	AssertRCReturn(rc, rc);
417
418	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
419	{
420	if(csamInfo.pPDBitmapHC[i])
421	{
422	/* Save the page bitmap. */
423	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
424	AssertRCReturn(rc, rc);
425	}
426	}
427
428	/*
429	* Save page records
430	*/
431	rc = RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, SavePageState, pVM);
432	AssertRCReturn(rc, rc);
433
434	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
435	return VINF_SUCCESS;
436	}
437
438	/**
439	* Execute state load operation.
440	*
441	* @returns VBox status code.
442	* @param pVM VM Handle.
443	* @param pSSM SSM operation handle.
444	* @param u32Version Data layout version.
445	*/
446	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
447	{
448	int rc;
449	CSAM csamInfo;
450
451	if (u32Version != CSAM_SSM_VERSION)
452	{
453	AssertMsgFailed(("csamR3Load: Invalid version u32Version=%d!\n", u32Version));
454	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
455	}
456
457	pVM->csam.s.savedstate.pSSM = pSSM;
458
459	/*
460	* Restore CSAM structure
461	*/
462	rc = SSMR3GetMem(pSSM, &csamInfo, sizeof(csamInfo));
463	AssertRCReturn(rc, rc);
464
465	pVM->csam.s.fGatesChecked = csamInfo.fGatesChecked;
466	pVM->csam.s.fScanningStarted = csamInfo.fScanningStarted;
467
468	/* Restore dirty code page info. */
469	pVM->csam.s.cDirtyPages = csamInfo.cDirtyPages;
470	memcpy(pVM->csam.s.pvDirtyBasePage, csamInfo.pvDirtyBasePage, sizeof(pVM->csam.s.pvDirtyBasePage));
471	memcpy(pVM->csam.s.pvDirtyFaultPage, csamInfo.pvDirtyFaultPage, sizeof(pVM->csam.s.pvDirtyFaultPage));
472
473	/* Restore possible code page */
474	pVM->csam.s.cPossibleCodePages = csamInfo.cPossibleCodePages;
475	memcpy(pVM->csam.s.pvPossibleCodePage, csamInfo.pvPossibleCodePage, sizeof(pVM->csam.s.pvPossibleCodePage));
476
477	/* Restore pgdir bitmap (we'll change the pointers next). */
478	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
479	AssertRCReturn(rc, rc);
480
481	/*
482	* Restore page bitmaps
483	*/
484	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
485	{
486	if(pVM->csam.s.pPDBitmapHC[i])
487	{
488	rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC[i]);
489	if (VBOX_FAILURE(rc))
490	{
491	Log(("MMR3HyperAlloc failed with %d\n", rc));
492	return rc;
493	}
494	/* Convert to GC pointer. */
495	pVM->csam.s.pPDGCBitmapHC[i] = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC[i]);
496	Assert(pVM->csam.s.pPDGCBitmapHC[i]);
497
498	/* Restore the bitmap. */
499	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
500	AssertRCReturn(rc, rc);
501	}
502	else
503	{
504	Assert(!pVM->csam.s.pPDGCBitmapHC[i]);
505	pVM->csam.s.pPDGCBitmapHC[i] = 0;
506	}
507	}
508
509	/*
510	* Restore page records
511	*/
512	for (uint32_t i=0;i<csamInfo.savedstate.cPageRecords + csamInfo.savedstate.cPatchPageRecords;i++)
513	{
514	CSAMPAGEREC page;
515	PCSAMPAGE pPage;
516
517	rc = SSMR3GetMem(pSSM, &page, sizeof(page));
518	AssertRCReturn(rc, rc);
519
520	/*
521	* Recreate the page record
522	*/
523	pPage = csamCreatePageRecord(pVM, page.page.pPageGC, page.page.enmTag, page.page.fCode32, page.page.fMonitorInvalidation);
524	AssertReturn(pPage, VERR_NO_MEMORY);
525
526	pPage->GCPhys = page.page.GCPhys;
527	pPage->fFlags = page.page.fFlags;
528	pPage->u64Hash = page.page.u64Hash;
529
530	if (page.page.pBitmap)
531	{
532	rc = SSMR3GetMem(pSSM, pPage->pBitmap, CSAM_PAGE_BITMAP_SIZE);
533	AssertRCReturn(rc, rc);
534	}
535	else
536	{
537	MMR3HeapFree(pPage->pBitmap);
538	pPage->pBitmap = 0;
539	}
540	}
541
542	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
543	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
544	pVM->csam.s.cDangerousInstr = 0;
545	pVM->csam.s.iDangerousInstr = 0;
546	return VINF_SUCCESS;
547	}
548
549	/**
550	* Convert guest context address to host context pointer
551	*
552	* @returns VBox status code.
553	* @param pVM The VM to operate on.
554	* @param pCacheRec Address conversion cache record
555	* @param pGCPtr Guest context pointer
556	*
557	* @returns Host context pointer or NULL in case of an error
558	*
559	*/
560	static R3PTRTYPE(void ) CSAMGCVirtToHCVirt(PVM pVM, PCSAMP2GLOOKUPREC pCacheRec, RCPTRTYPE(uint8_t ) pGCPtr)
561	{
562	int rc;
563	R3PTRTYPE(void *) pHCPtr;
564
565	STAM_PROFILE_START(&pVM->csam.s.StatTimeAddrConv, a);
566
567	pHCPtr = PATMR3GCPtrToHCPtr(pVM, pGCPtr);
568	if (pHCPtr) return pHCPtr;
569
570	if (pCacheRec->pPageLocStartHC)
571	{
572	uint32_t offset = pGCPtr & PAGE_OFFSET_MASK;
573	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
574	{
575	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
576	return pCacheRec->pPageLocStartHC + offset;
577	}
578	}
579
580	rc = PGMPhysGCPtr2HCPtr(pVM, pGCPtr, &pHCPtr);
581	if (rc != VINF_SUCCESS)
582	{
583	//// AssertMsgRC(rc, ("MMR3PhysGCVirt2HCVirtEx failed for %VRv\n", pGCPtr));
584	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
585	return NULL;
586	}
587	////invalid? Assert(sizeof(R3PTRTYPE(uint8_t*)) == sizeof(uint32_t));
588
589	pCacheRec->pPageLocStartHC = (R3PTRTYPE(uint8_t*))((RTHCUINTPTR)pHCPtr & PAGE_BASE_HC_MASK);
590	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
591	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
592	return pHCPtr;
593	}
594
595	/**
596	* Read callback for disassembly function; supports reading bytes that cross a page boundary
597	*
598	* @returns VBox status code.
599	* @param pSrc GC source pointer
600	* @param pDest HC destination pointer
601	* @param size Number of bytes to read
602	* @param dwUserdata Callback specific user data (pCpu)
603	*
604	*/
605	static DECLCALLBACK(int) CSAMR3ReadBytes(RTUINTPTR pSrc, uint8_t pDest, unsigned size, void pvUserdata)
606	{
607	DISCPUSTATE pCpu = (DISCPUSTATE )pvUserdata;
608	PVM pVM = (PVM)pCpu->apvUserData[0];
609	RTHCUINTPTR pInstrHC = (RTHCUINTPTR)pCpu->apvUserData[1];
610	RTGCUINTPTR32 pInstrGC = (uintptr_t)pCpu->apvUserData[2];
611	int orgsize = size;
612
613	/* We are not interested in patched instructions, so read the original opcode bytes. */
614	/** @note single instruction patches (int3) are checked in CSAMR3AnalyseCallback */
615	for (int i=0;i<orgsize;i++)
616	{
617	int rc = PATMR3QueryOpcode(pVM, (RTRCPTR)pSrc, pDest);
618	if (VBOX_SUCCESS(rc))
619	{
620	pSrc++;
621	pDest++;
622	size--;
623	}
624	else
625	break;
626	}
627	if (size == 0)
628	return VINF_SUCCESS;
629
630	if (PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pSrc + size - 1) && !PATMIsPatchGCAddr(pVM, pSrc))
631	{
632	return PGMPhysReadGCPtr(pVM, pDest, pSrc, size);
633	}
634	else
635	{
636	Assert(pInstrHC);
637
638	/* pInstrHC is the base address; adjust according to the GC pointer. */
639	pInstrHC = pInstrHC + (pSrc - pInstrGC);
640
641	memcpy(pDest, (void *)pInstrHC, size);
642	}
643
644	return VINF_SUCCESS;
645	}
646
647	inline int CSAMR3DISInstr(PVM pVM, DISCPUSTATE pCpu, RTRCPTR InstrGC, uint8_t InstrHC, uint32_t pOpsize, char pszOutput)
648	{
649	(pCpu)->pfnReadBytes = CSAMR3ReadBytes;
650	(pCpu)->apvUserData[0] = pVM;
651	(pCpu)->apvUserData[1] = InstrHC;
652	(pCpu)->apvUserData[2] = (void *)InstrGC; Assert(sizeof(InstrGC) <= sizeof(pCpu->apvUserData[0]));
653	#ifdef DEBUG
654	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, OPTYPE_ALL);
655	#else
656	/* We are interested in everything except harmless stuff */
657	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, ~(OPTYPE_INVALID \| OPTYPE_HARMLESS \| OPTYPE_RRM_MASK));
658	#endif
659	}
660
661	/**
662	* Analyses the instructions following the cli for compliance with our heuristics for cli
663	*
664	* @returns VBox status code.
665	* @param pVM The VM to operate on.
666	* @param pCpu CPU disassembly state
667	* @param pInstrGC Guest context pointer to privileged instruction
668	* @param pCurInstrGC Guest context pointer to the current instruction
669	* @param pCacheRec GC to HC cache record
670	* @param pUserData User pointer (callback specific)
671	*
672	*/
673	static int CSAMR3AnalyseCallback(PVM pVM, DISCPUSTATE pCpu, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t *) pCurInstrGC,
674	PCSAMP2GLOOKUPREC pCacheRec, void *pUserData)
675	{
676	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
677	int rc;
678
679	switch(pCpu->pCurInstr->opcode)
680	{
681	case OP_INT:
682	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
683	if (pCpu->param1.parval == 3)
684	{
685	//two byte int 3
686	return VINF_SUCCESS;
687	}
688	break;
689
690	case OP_ILLUD2:
691	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue. */
692	case OP_RETN:
693	case OP_INT3:
694	case OP_INVALID:
695	#if 1
696	/* removing breaks win2k guests? */
697	case OP_IRET:
698	#endif
699	return VINF_SUCCESS;
700	}
701
702	// Check for exit points
703	switch (pCpu->pCurInstr->opcode)
704	{
705	/* It's not a good idea to patch pushf instructions:
706	* - increases the chance of conflicts (code jumping to the next instruction)
707	* - better to patch the cli
708	* - code that branches before the cli will likely hit an int 3
709	* - in general doesn't offer any benefits as we don't allow nested patch blocks (IF is always 1)
710	*/
711	case OP_PUSHF:
712	case OP_POPF:
713	break;
714
715	case OP_CLI:
716	{
717	uint32_t cbInstr = 0;
718	uint32_t opsize = pCpu->opsize;
719
720	PATMR3AddHint(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
721
722	/* Make sure the instructions that follow the cli have not been encountered before. */
723	while (true)
724	{
725	DISCPUSTATE cpu;
726	uint8_t *pCurInstrHC = 0;
727
728	if (cbInstr + opsize >= SIZEOF_NEARJUMP32)
729	break;
730
731	if (csamIsCodeScanned(pVM, pCurInstrGC + opsize, &pPage) == true)
732	{
733	/* We've scanned the next instruction(s) already. This means we've followed a branch that ended up there before -> dangerous!! */
734	PATMR3DetectConflict(pVM, pCurInstrGC, pCurInstrGC + opsize);
735	break;
736	}
737	pCurInstrGC += opsize;
738	cbInstr += opsize;
739
740	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
741	if (pCurInstrHC == NULL)
742	{
743	Log(("CSAMGCVirtToHCVirt failed for %VRv\n", pCurInstrGC));
744	break;
745	}
746	Assert(VALID_PTR(pCurInstrHC));
747
748	cpu.mode = (pPage->fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
749	rc = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
750	Assert(VBOX_SUCCESS(rc));
751	if (VBOX_FAILURE(rc))
752	break;
753	}
754	break;
755	}
756
757	case OP_PUSH:
758	if (pCpu->pCurInstr->param1 != OP_PARM_REG_CS)
759	break;
760
761	/* no break */
762	case OP_STR:
763	case OP_LSL:
764	case OP_LAR:
765	case OP_SGDT:
766	case OP_SLDT:
767	case OP_SIDT:
768	case OP_SMSW:
769	case OP_VERW:
770	case OP_VERR:
771	case OP_CPUID:
772	case OP_IRET:
773	#ifdef DEBUG
774	switch(pCpu->pCurInstr->opcode)
775	{
776	case OP_STR:
777	Log(("Privileged instruction at %VRv: str!!\n", pCurInstrGC));
778	break;
779	case OP_LSL:
780	Log(("Privileged instruction at %VRv: lsl!!\n", pCurInstrGC));
781	break;
782	case OP_LAR:
783	Log(("Privileged instruction at %VRv: lar!!\n", pCurInstrGC));
784	break;
785	case OP_SGDT:
786	Log(("Privileged instruction at %VRv: sgdt!!\n", pCurInstrGC));
787	break;
788	case OP_SLDT:
789	Log(("Privileged instruction at %VRv: sldt!!\n", pCurInstrGC));
790	break;
791	case OP_SIDT:
792	Log(("Privileged instruction at %VRv: sidt!!\n", pCurInstrGC));
793	break;
794	case OP_SMSW:
795	Log(("Privileged instruction at %VRv: smsw!!\n", pCurInstrGC));
796	break;
797	case OP_VERW:
798	Log(("Privileged instruction at %VRv: verw!!\n", pCurInstrGC));
799	break;
800	case OP_VERR:
801	Log(("Privileged instruction at %VRv: verr!!\n", pCurInstrGC));
802	break;
803	case OP_CPUID:
804	Log(("Privileged instruction at %VRv: cpuid!!\n", pCurInstrGC));
805	break;
806	case OP_PUSH:
807	Log(("Privileged instruction at %VRv: push cs!!\n", pCurInstrGC));
808	break;
809	case OP_IRET:
810	Log(("Privileged instruction at %VRv: iret!!\n", pCurInstrGC));
811	break;
812	}
813	#endif
814
815	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
816	{
817	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
818	if (VBOX_FAILURE(rc))
819	{
820	Log(("PATMR3InstallPatch failed with %d\n", rc));
821	return VWRN_CONTINUE_ANALYSIS;
822	}
823	}
824	if (pCpu->pCurInstr->opcode == OP_IRET)
825	return VINF_SUCCESS; /* Look no further in this branch. */
826
827	return VWRN_CONTINUE_ANALYSIS;
828
829	case OP_JMP:
830	case OP_CALL:
831	{
832	// return or jump/call through a jump table
833	if (OP_PARM_VTYPE(pCpu->pCurInstr->param1) != OP_PARM_J)
834	{
835	#ifdef DEBUG
836	switch(pCpu->pCurInstr->opcode)
837	{
838	case OP_JMP:
839	Log(("Control Flow instruction at %VRv: jmp!!\n", pCurInstrGC));
840	break;
841	case OP_CALL:
842	Log(("Control Flow instruction at %VRv: call!!\n", pCurInstrGC));
843	break;
844	}
845	#endif
846	return VWRN_CONTINUE_ANALYSIS;
847	}
848	return VWRN_CONTINUE_ANALYSIS;
849	}
850
851	}
852
853	return VWRN_CONTINUE_ANALYSIS;
854	}
855
856	#ifdef CSAM_ANALYSE_BEYOND_RET
857	/**
858	* Wrapper for csamAnalyseCodeStream for call instructions.
859	*
860	* @returns VBox status code.
861	* @param pVM The VM to operate on.
862	* @param pInstrGC Guest context pointer to privileged instruction
863	* @param pCurInstrGC Guest context pointer to the current instruction
864	* @param fCode32 16 or 32 bits code
865	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
866	* @param pUserData User pointer (callback specific)
867	*
868	*/
869	static int csamAnalyseCallCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
870	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
871	{
872	int rc;
873	CSAMCALLEXITREC CallExitRec;
874	PCSAMCALLEXITREC pOldCallRec;
875	PCSAMPAGE pPage = 0;
876	uint32_t i;
877
878	CallExitRec.cInstrAfterRet = 0;
879
880	pOldCallRec = pCacheRec->pCallExitRec;
881	pCacheRec->pCallExitRec = &CallExitRec;
882
883	rc = csamAnalyseCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
884
885	for (i=0;i<CallExitRec.cInstrAfterRet;i++)
886	{
887	PCSAMPAGE pPage = 0;
888
889	pCurInstrGC = CallExitRec.pInstrAfterRetGC[i];
890
891	/* Check if we've previously encountered the instruction after the ret. */
892	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
893	{
894	DISCPUSTATE cpu;
895	uint32_t opsize;
896	uint8_t *pCurInstrHC = 0;
897	int rc2;
898	#ifdef DEBUG
899	char szOutput[256];
900	#endif
901	if (pPage == NULL)
902	{
903	/* New address; let's take a look at it. */
904	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
905	if (pPage == NULL)
906	{
907	rc = VERR_NO_MEMORY;
908	goto done;
909	}
910	}
911
912	/**
913	* Some generic requirements for recognizing an adjacent function:
914	* - alignment fillers that consist of:
915	* - nop
916	* - lea genregX, [genregX (+ 0)]
917	* - push ebp after the filler (can extend this later); aligned at at least a 4 byte boundary
918	*/
919	for (int j=0;j<16;j++)
920	{
921	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
922	if (pCurInstrHC == NULL)
923	{
924	Log(("CSAMGCVirtToHCVirt failed for %VRv\n", pCurInstrGC));
925	goto done;
926	}
927	Assert(VALID_PTR(pCurInstrHC));
928
929	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
930	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
931	#ifdef DEBUG
932	rc2 = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
933	if (VBOX_SUCCESS(rc2)) Log(("CSAM Call Analysis: %s", szOutput));
934	#else
935	rc2 = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
936	#endif
937	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
938	if (VBOX_FAILURE(rc2))
939	{
940	Log(("Disassembly failed at %VRv with %Vrc (probably page not present) -> return to caller\n", pCurInstrGC, rc2));
941	goto done;
942	}
943
944	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
945
946	RCPTRTYPE(uint8_t *) addr = 0;
947	PCSAMPAGE pJmpPage = NULL;
948
949	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
950	{
951	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
952	{
953	/// @todo fault in the page
954	Log(("Page for current instruction %VRv is not present!!\n", pCurInstrGC));
955	goto done;
956	}
957	//all is fine, let's continue
958	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
959	}
960
961	switch (cpu.pCurInstr->opcode)
962	{
963	case OP_NOP:
964	case OP_INT3:
965	break; /* acceptable */
966
967	case OP_LEA:
968	/* Must be similar to:
969	*
970	* lea esi, [esi]
971	* lea esi, [esi+0]
972	* Any register is allowed as long as source and destination are identical.
973	*/
974	if ( cpu.param1.flags != USE_REG_GEN32
975	\|\| ( cpu.param2.flags != USE_REG_GEN32
976	&& ( !(cpu.param2.flags & USE_REG_GEN32)
977	\|\| !(cpu.param2.flags & (USE_DISPLACEMENT8\|USE_DISPLACEMENT16\|USE_DISPLACEMENT32))
978	\|\| cpu.param2.parval != 0
979	)
980	)
981	\|\| cpu.param1.base.reg_gen32 != cpu.param2.base.reg_gen32
982	)
983	{
984	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
985	goto next_function;
986	}
987	break;
988
989	case OP_PUSH:
990	{
991	if ( (pCurInstrGC & 0x3) != 0
992	\|\| cpu.param1.flags != USE_REG_GEN32
993	\|\| cpu.param1.base.reg_gen32 != USE_REG_EBP
994	)
995	{
996	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
997	goto next_function;
998	}
999
1000	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1001	{
1002	CSAMCALLEXITREC CallExitRec2;
1003	CallExitRec2.cInstrAfterRet = 0;
1004
1005	pCacheRec->pCallExitRec = &CallExitRec2;
1006
1007	/* Analyse the function. */
1008	Log(("Found new function at %VRv\n", pCurInstrGC));
1009	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1010	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1011	}
1012	goto next_function;
1013	}
1014
1015	case OP_SUB:
1016	{
1017	if ( (pCurInstrGC & 0x3) != 0
1018	\|\| cpu.param1.flags != USE_REG_GEN32
1019	\|\| cpu.param1.base.reg_gen32 != USE_REG_ESP
1020	)
1021	{
1022	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1023	goto next_function;
1024	}
1025
1026	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1027	{
1028	CSAMCALLEXITREC CallExitRec2;
1029	CallExitRec2.cInstrAfterRet = 0;
1030
1031	pCacheRec->pCallExitRec = &CallExitRec2;
1032
1033	/* Analyse the function. */
1034	Log(("Found new function at %VRv\n", pCurInstrGC));
1035	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1036	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1037	}
1038	goto next_function;
1039	}
1040
1041	default:
1042	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1043	goto next_function;
1044	}
1045	/* Mark it as scanned. */
1046	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1047	pCurInstrGC += opsize;
1048	} /* for at most 16 instructions */
1049	next_function:
1050	; /* MSVC complains otherwise */
1051	}
1052	}
1053	done:
1054	pCacheRec->pCallExitRec = pOldCallRec;
1055	return rc;
1056	}
1057	#else
1058	#define csamAnalyseCallCodeStream csamAnalyseCodeStream
1059	#endif
1060
1061	/**
1062	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
1063	*
1064	* @returns VBox status code.
1065	* @param pVM The VM to operate on.
1066	* @param pInstrGC Guest context pointer to privileged instruction
1067	* @param pCurInstrGC Guest context pointer to the current instruction
1068	* @param fCode32 16 or 32 bits code
1069	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1070	* @param pUserData User pointer (callback specific)
1071	*
1072	*/
1073	static int csamAnalyseCodeStream(PVM pVM, RCPTRTYPE(uint8_t ) pInstrGC, RCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1074	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1075	{
1076	DISCPUSTATE cpu;
1077	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
1078	int rc = VWRN_CONTINUE_ANALYSIS;
1079	uint32_t opsize;
1080	R3PTRTYPE(uint8_t *) pCurInstrHC = 0;
1081	int rc2;
1082
1083	#ifdef DEBUG
1084	char szOutput[256];
1085	#endif
1086
1087	LogFlow(("csamAnalyseCodeStream: code at %VRv depth=%d\n", pCurInstrGC, pCacheRec->depth));
1088
1089	pVM->csam.s.fScanningStarted = true;
1090
1091	pCacheRec->depth++;
1092	/*
1093	* Limit the call depth. (rather arbitrary upper limit; too low and we won't detect certain
1094	* cpuid instructions in Linux kernels; too high and we waste too much time scanning code)
1095	* (512 is necessary to detect cpuid instructions in Red Hat EL4; see defect 1355)
1096	* @note we are using a lot of stack here. couple of 100k when we go to the full depth (!)
1097	*/
1098	if (pCacheRec->depth > 512)
1099	{
1100	LogFlow(("CSAM: maximum calldepth reached for %VRv\n", pCurInstrGC));
1101	pCacheRec->depth--;
1102	return VINF_SUCCESS; //let's not go on forever
1103	}
1104
1105	Assert(!PATMIsPatchGCAddr(pVM, pCurInstrGC));
1106	csamR3CheckPageRecord(pVM, pCurInstrGC);
1107
1108	while(rc == VWRN_CONTINUE_ANALYSIS)
1109	{
1110	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1111	{
1112	if (pPage == NULL)
1113	{
1114	/* New address; let's take a look at it. */
1115	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1116	if (pPage == NULL)
1117	{
1118	rc = VERR_NO_MEMORY;
1119	goto done;
1120	}
1121	}
1122	}
1123	else
1124	{
1125	LogFlow(("Code at %VRv has been scanned before\n", pCurInstrGC));
1126	rc = VINF_SUCCESS;
1127	goto done;
1128	}
1129
1130	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1131	if (pCurInstrHC == NULL)
1132	{
1133	Log(("CSAMGCVirtToHCVirt failed for %VRv\n", pCurInstrGC));
1134	rc = VERR_PATCHING_REFUSED;
1135	goto done;
1136	}
1137	Assert(VALID_PTR(pCurInstrHC));
1138
1139	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
1140	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1141	#ifdef DEBUG
1142	rc2 = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
1143	if (VBOX_SUCCESS(rc2)) Log(("CSAM Analysis: %s", szOutput));
1144	#else
1145	rc2 = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
1146	#endif
1147	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1148	if (VBOX_FAILURE(rc2))
1149	{
1150	Log(("Disassembly failed at %VRv with %Vrc (probably page not present) -> return to caller\n", pCurInstrGC, rc2));
1151	rc = VINF_SUCCESS;
1152	goto done;
1153	}
1154
1155	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
1156
1157	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1158
1159	RCPTRTYPE(uint8_t *) addr = 0;
1160	PCSAMPAGE pJmpPage = NULL;
1161
1162	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
1163	{
1164	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
1165	{
1166	/// @todo fault in the page
1167	Log(("Page for current instruction %VRv is not present!!\n", pCurInstrGC));
1168	rc = VWRN_CONTINUE_ANALYSIS;
1169	goto next_please;
1170	}
1171	//all is fine, let's continue
1172	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
1173	}
1174	/*
1175	* If it's harmless, then don't bother checking it (the disasm tables had better be accurate!)
1176	*/
1177	if ((cpu.pCurInstr->optype & ~OPTYPE_RRM_MASK) == OPTYPE_HARMLESS)
1178	{
1179	AssertMsg(pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage) == VWRN_CONTINUE_ANALYSIS, ("Instruction incorrectly marked harmless?!?!?\n"));
1180	rc = VWRN_CONTINUE_ANALYSIS;
1181	goto next_please;
1182	}
1183
1184	#ifdef CSAM_ANALYSE_BEYOND_RET
1185	/* Remember the address of the instruction following the ret in case the parent instruction was a call. */
1186	if ( pCacheRec->pCallExitRec
1187	&& cpu.pCurInstr->opcode == OP_RETN
1188	&& pCacheRec->pCallExitRec->cInstrAfterRet < CSAM_MAX_CALLEXIT_RET)
1189	{
1190	pCacheRec->pCallExitRec->pInstrAfterRetGC[pCacheRec->pCallExitRec->cInstrAfterRet] = pCurInstrGC + opsize;
1191	pCacheRec->pCallExitRec->cInstrAfterRet++;
1192	}
1193	#endif
1194
1195	rc = pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage);
1196	if (rc == VINF_SUCCESS)
1197	goto done;
1198
1199	// For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction)
1200	if ( ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1201	\|\| (cpu.pCurInstr->opcode == OP_CALL && cpu.param1.flags == USE_DISPLACEMENT32)) /* simple indirect call (call dword ptr [address]) */
1202	{
1203	/* We need to parse 'call dword ptr [address]' type of calls to catch cpuid instructions in some recent Linux distributions (e.g. OpenSuse 10.3) */
1204	if ( cpu.pCurInstr->opcode == OP_CALL
1205	&& cpu.param1.flags == USE_DISPLACEMENT32)
1206	{
1207	addr = 0;
1208	PGMPhysReadGCPtr(pVM, &addr, (RTRCUINTPTR)cpu.param1.disp32, sizeof(addr));
1209	}
1210	else
1211	addr = CSAMResolveBranch(&cpu, pCurInstrGC);
1212
1213	if (addr == 0)
1214	{
1215	Log(("We don't support far jumps here!! (%08X)\n", cpu.param1.flags));
1216	rc = VINF_SUCCESS;
1217	break;
1218	}
1219	Assert(!PATMIsPatchGCAddr(pVM, addr));
1220
1221	/* If the target address lies in a patch generated jump, then special action needs to be taken. */
1222	PATMR3DetectConflict(pVM, pCurInstrGC, addr);
1223
1224	/* Same page? */
1225	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pCurInstrGC ))
1226	{
1227	if (!PGMGstIsPagePresent(pVM, addr))
1228	{
1229	Log(("Page for current instruction %VRv is not present!!\n", addr));
1230	rc = VWRN_CONTINUE_ANALYSIS;
1231	goto next_please;
1232	}
1233
1234	/* All is fine, let's continue. */
1235	csamR3CheckPageRecord(pVM, addr);
1236	}
1237
1238	pJmpPage = NULL;
1239	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1240	{
1241	if (pJmpPage == NULL)
1242	{
1243	/* New branch target; let's take a look at it. */
1244	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1245	if (pJmpPage == NULL)
1246	{
1247	rc = VERR_NO_MEMORY;
1248	goto done;
1249	}
1250	Assert(pPage);
1251	}
1252	if (cpu.pCurInstr->opcode == OP_CALL)
1253	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1254	else
1255	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1256
1257	if (rc != VINF_SUCCESS) {
1258	goto done;
1259	}
1260	}
1261	if (cpu.pCurInstr->opcode == OP_JMP)
1262	{//unconditional jump; return to caller
1263	rc = VINF_SUCCESS;
1264	goto done;
1265	}
1266
1267	rc = VWRN_CONTINUE_ANALYSIS;
1268	} //if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1269	#ifdef CSAM_SCAN_JUMP_TABLE
1270	else
1271	if ( cpu.pCurInstr->opcode == OP_JMP
1272	&& (cpu.param1.flags & (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)) == (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)
1273	)
1274	{
1275	RTRCPTR pJumpTableGC = (RTRCPTR)cpu.param1.disp32;
1276	uint8_t *pJumpTableHC;
1277	int rc2;
1278
1279	Log(("Jump through jump table\n"));
1280
1281	rc2 = PGMPhysGCPtr2HCPtr(pVM, pJumpTableGC, (PRTHCPTR)&pJumpTableHC);
1282	if (rc2 == VINF_SUCCESS)
1283	{
1284	for (uint32_t i=0;i<2;i++)
1285	{
1286	uint64_t fFlags;
1287
1288	addr = pJumpTableGC + cpu.param1.scale * i;
1289	/* Same page? */
1290	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pJumpTableGC))
1291	break;
1292
1293	addr = (RTRCPTR )(pJumpTableHC + cpu.param1.scale * i);
1294
1295	rc2 = PGMGstGetPage(pVM, addr, &fFlags, NULL);
1296	if ( rc2 != VINF_SUCCESS
1297	\|\| (fFlags & X86_PTE_US)
1298	\|\| !(fFlags & X86_PTE_P)
1299	)
1300	break;
1301
1302	Log(("Jump to %VRv\n", addr));
1303
1304	pJmpPage = NULL;
1305	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1306	{
1307	if (pJmpPage == NULL)
1308	{
1309	/* New branch target; let's take a look at it. */
1310	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1311	if (pJmpPage == NULL)
1312	{
1313	rc = VERR_NO_MEMORY;
1314	goto done;
1315	}
1316	Assert(pPage);
1317	}
1318	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1319	if (rc != VINF_SUCCESS) {
1320	goto done;
1321	}
1322	}
1323	}
1324	}
1325	}
1326	#endif
1327	if (rc != VWRN_CONTINUE_ANALYSIS) {
1328	break; //done!
1329	}
1330	next_please:
1331	if (cpu.pCurInstr->opcode == OP_JMP)
1332	{
1333	rc = VINF_SUCCESS;
1334	goto done;
1335	}
1336	pCurInstrGC += opsize;
1337	}
1338	done:
1339	pCacheRec->depth--;
1340	return rc;
1341	}
1342
1343
1344	/**
1345	* Calculates the 64 bits hash value for the current page
1346	*
1347	* @returns hash value
1348	* @param pVM The VM to operate on.
1349	* @param pInstr Page address
1350	*/
1351	uint64_t csamR3CalcPageHash(PVM pVM, RTRCPTR pInstr)
1352	{
1353	uint64_t hash = 0;
1354	uint32_t val[5];
1355	int rc;
1356
1357	Assert((pInstr & PAGE_OFFSET_MASK) == 0);
1358
1359	rc = PGMPhysReadGCPtr(pVM, &val[0], pInstr, sizeof(val[0]));
1360	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1361	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1362	{
1363	Log(("csamR3CalcPageHash: page %VRv not present!!\n", pInstr));
1364	return ~0ULL;
1365	}
1366
1367	rc = PGMPhysReadGCPtr(pVM, &val[1], pInstr+1024, sizeof(val[0]));
1368	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1369	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1370	{
1371	Log(("csamR3CalcPageHash: page %VRv not present!!\n", pInstr));
1372	return ~0ULL;
1373	}
1374
1375	rc = PGMPhysReadGCPtr(pVM, &val[2], pInstr+2048, sizeof(val[0]));
1376	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1377	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1378	{
1379	Log(("csamR3CalcPageHash: page %VRv not present!!\n", pInstr));
1380	return ~0ULL;
1381	}
1382
1383	rc = PGMPhysReadGCPtr(pVM, &val[3], pInstr+3072, sizeof(val[0]));
1384	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1385	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1386	{
1387	Log(("csamR3CalcPageHash: page %VRv not present!!\n", pInstr));
1388	return ~0ULL;
1389	}
1390
1391	rc = PGMPhysReadGCPtr(pVM, &val[4], pInstr+4092, sizeof(val[0]));
1392	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1393	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1394	{
1395	Log(("csamR3CalcPageHash: page %VRv not present!!\n", pInstr));
1396	return ~0ULL;
1397	}
1398
1399	// don't want to get division by zero traps
1400	val[2] \|= 1;
1401	val[4] \|= 1;
1402
1403	hash = (uint64_t)val[0] * (uint64_t)val[1] / (uint64_t)val[2] + (val[3]%val[4]);
1404	return (hash == ~0ULL) ? hash - 1 : hash;
1405	}
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, RTRCPTR 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 %VRv 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 %VRv 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	if (pPageRec->page.pBitmap == NULL)
1490	{
1491	pPageRec->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, CSAM_PAGE_BITMAP_SIZE);
1492	Assert(pPageRec->page.pBitmap);
1493	if (pPageRec->page.pBitmap == NULL)
1494	return VERR_NO_MEMORY;
1495	}
1496	else
1497	memset(pPageRec->page.pBitmap, 0, CSAM_PAGE_BITMAP_SIZE);
1498	}
1499
1500
1501	/*
1502	* Inform patch manager about the flush; no need to repeat the above check twice.
1503	*/
1504	PATMR3FlushPage(pVM, addr);
1505
1506	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1507	return VINF_SUCCESS;
1508	}
1509	else
1510	{
1511	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1512	return VWRN_CSAM_PAGE_NOT_FOUND;
1513	}
1514	}
1515
1516	/**
1517	* Notify CSAM of a page flush
1518	*
1519	* @returns VBox status code
1520	* @param pVM The VM to operate on.
1521	* @param addr GC address of the page to flush
1522	*/
1523	CSAMR3DECL(int) CSAMR3FlushPage(PVM pVM, RTRCPTR addr)
1524	{
1525	return csamFlushPage(pVM, addr, true /* remove page record */);
1526	}
1527
1528	/**
1529	* Remove a CSAM monitored page. Use with care!
1530	*
1531	* @returns VBox status code
1532	* @param pVM The VM to operate on.
1533	* @param addr GC address of the page to flush
1534	*/
1535	CSAMR3DECL(int) CSAMR3RemovePage(PVM pVM, RTRCPTR addr)
1536	{
1537	PCSAMPAGEREC pPageRec;
1538	int rc;
1539
1540	addr = addr & PAGE_BASE_GC_MASK;
1541
1542	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)addr);
1543	if (pPageRec)
1544	{
1545	rc = csamRemovePageRecord(pVM, addr);
1546	if (VBOX_SUCCESS(rc))
1547	PATMR3FlushPage(pVM, addr);
1548	return VINF_SUCCESS;
1549	}
1550	return VWRN_CSAM_PAGE_NOT_FOUND;
1551	}
1552
1553	/**
1554	* Check a page record in case a page has been changed
1555	*
1556	* @returns VBox status code. (trap handled or not)
1557	* @param pVM The VM to operate on.
1558	* @param pInstrGC GC instruction pointer
1559	*/
1560	int csamR3CheckPageRecord(PVM pVM, RTRCPTR pInstrGC)
1561	{
1562	PCSAMPAGEREC pPageRec;
1563	uint64_t u64hash;
1564
1565	pInstrGC = pInstrGC & PAGE_BASE_GC_MASK;
1566
1567	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstrGC);
1568	if (pPageRec)
1569	{
1570	u64hash = csamR3CalcPageHash(pVM, pInstrGC);
1571	if (u64hash != pPageRec->page.u64Hash)
1572	csamFlushPage(pVM, pInstrGC, false /* don't remove page record */);
1573	}
1574	else
1575	return VWRN_CSAM_PAGE_NOT_FOUND;
1576
1577	return VINF_SUCCESS;
1578	}
1579
1580	/**
1581	* Returns monitor description based on CSAM tag
1582	*
1583	* @return description string
1584	* @param enmTag Owner tag
1585	*/
1586	const char *csamGetMonitorDescription(CSAMTAG enmTag)
1587	{
1588	if (enmTag == CSAM_TAG_PATM)
1589	return "CSAM-PATM self-modifying code monitor handler";
1590	else
1591	if (enmTag == CSAM_TAG_REM)
1592	return "CSAM-REM self-modifying code monitor handler";
1593	Assert(enmTag == CSAM_TAG_CSAM);
1594	return "CSAM self-modifying code monitor handler";
1595	}
1596
1597	/**
1598	* Adds page record to our lookup tree
1599	*
1600	* @returns CSAMPAGE ptr or NULL if failure
1601	* @param pVM The VM to operate on.
1602	* @param GCPtr Page address
1603	* @param enmTag Owner tag
1604	* @param fCode32 16 or 32 bits code
1605	* @param fMonitorInvalidation Monitor page invalidation flag
1606	*/
1607	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTRCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation)
1608	{
1609	PCSAMPAGEREC pPage;
1610	int rc;
1611	bool ret;
1612
1613	Log(("New page record for %VRv\n", GCPtr & PAGE_BASE_GC_MASK));
1614
1615	pPage = (PCSAMPAGEREC)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, sizeof(CSAMPAGEREC));
1616	if (pPage == NULL)
1617	{
1618	AssertMsgFailed(("csamCreatePageRecord: Out of memory!!!!\n"));
1619	return NULL;
1620	}
1621	/* Round down to page boundary. */
1622	GCPtr = (GCPtr & PAGE_BASE_GC_MASK);
1623	pPage->Core.Key = (AVLPVKEY)GCPtr;
1624	pPage->page.pPageGC = GCPtr;
1625	pPage->page.fCode32 = fCode32;
1626	pPage->page.fMonitorInvalidation = fMonitorInvalidation;
1627	pPage->page.enmTag = enmTag;
1628	pPage->page.fMonitorActive = false;
1629	pPage->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, PAGE_SIZE/sizeof(uint8_t));
1630	rc = PGMGstGetPage(pVM, GCPtr, &pPage->page.fFlags, &pPage->page.GCPhys);
1631	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1632
1633	pPage->page.u64Hash = csamR3CalcPageHash(pVM, GCPtr);
1634	ret = RTAvlPVInsert(&pVM->csam.s.pPageTree, &pPage->Core);
1635	Assert(ret);
1636
1637	#ifdef CSAM_MONITOR_CODE_PAGES
1638	AssertRelease(!fInCSAMCodePageInvalidate);
1639
1640	switch (enmTag)
1641	{
1642	case CSAM_TAG_PATM:
1643	case CSAM_TAG_REM:
1644	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1645	case CSAM_TAG_CSAM:
1646	#endif
1647	{
1648	int rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtr, GCPtr + (PAGE_SIZE - 1) /* inclusive! */,
1649	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1650	csamGetMonitorDescription(enmTag));
1651	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VRv failed with %Vrc\n", GCPtr, rc));
1652	if (VBOX_FAILURE(rc))
1653	Log(("PGMR3HandlerVirtualRegisterEx for %VRv failed with %Vrc\n", GCPtr, rc));
1654
1655	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1656
1657	/* Prefetch it in case it's not there yet. */
1658	rc = PGMPrefetchPage(pVM, GCPtr);
1659	AssertRC(rc);
1660
1661	rc = PGMShwModifyPage(pVM, GCPtr, 1, 0, ~(uint64_t)X86_PTE_RW);
1662	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1663
1664	pPage->page.fMonitorActive = true;
1665	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1666	break;
1667	}
1668	default:
1669	break; /* to shut up GCC */
1670	}
1671
1672	Log(("csamCreatePageRecord %VRv HCPhys=%VGp\n", GCPtr, pPage->page.GCPhys));
1673
1674	#ifdef VBOX_WITH_STATISTICS
1675	switch (enmTag)
1676	{
1677	case CSAM_TAG_CSAM:
1678	STAM_COUNTER_INC(&pVM->csam.s.StatPageCSAM);
1679	break;
1680	case CSAM_TAG_PATM:
1681	STAM_COUNTER_INC(&pVM->csam.s.StatPagePATM);
1682	break;
1683	case CSAM_TAG_REM:
1684	STAM_COUNTER_INC(&pVM->csam.s.StatPageREM);
1685	break;
1686	default:
1687	break; /* to shut up GCC */
1688	}
1689	#endif
1690
1691	#endif
1692
1693	STAM_COUNTER_INC(&pVM->csam.s.StatNrPages);
1694	if (fMonitorInvalidation)
1695	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1696
1697	return &pPage->page;
1698	}
1699
1700	/**
1701	* Monitors a code page (if not already monitored)
1702	*
1703	* @returns VBox status code
1704	* @param pVM The VM to operate on.
1705	* @param pPageAddrGC The page to monitor
1706	* @param enmTag Monitor tag
1707	*/
1708	CSAMR3DECL(int) CSAMR3MonitorPage(PVM pVM, RTRCPTR pPageAddrGC, CSAMTAG enmTag)
1709	{
1710	PCSAMPAGEREC pPageRec = NULL;
1711	int rc;
1712	bool fMonitorInvalidation;
1713
1714	/* Dirty pages must be handled before calling this function!. */
1715	Assert(!pVM->csam.s.cDirtyPages);
1716
1717	if (pVM->csam.s.fScanningStarted == false)
1718	return VINF_SUCCESS; /* too early */
1719
1720	pPageAddrGC &= PAGE_BASE_GC_MASK;
1721
1722	Log(("CSAMR3MonitorPage %VRv %d\n", pPageAddrGC, enmTag));
1723
1724	/** @todo implicit assumption */
1725	fMonitorInvalidation = (enmTag == CSAM_TAG_PATM);
1726
1727	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1728	if (pPageRec == NULL)
1729	{
1730	uint64_t fFlags;
1731
1732	rc = PGMGstGetPage(pVM, pPageAddrGC, &fFlags, NULL);
1733	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1734	if ( rc == VINF_SUCCESS
1735	&& (fFlags & X86_PTE_US))
1736	{
1737	/* We don't care about user pages. */
1738	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
1739	return VINF_SUCCESS;
1740	}
1741
1742	csamCreatePageRecord(pVM, pPageAddrGC, enmTag, true /* 32 bits code */, fMonitorInvalidation);
1743
1744	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1745	Assert(pPageRec);
1746	}
1747	/** @todo reference count */
1748
1749	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1750	Assert(pPageRec->page.fMonitorActive);
1751	#endif
1752
1753	#ifdef CSAM_MONITOR_CODE_PAGES
1754	if (!pPageRec->page.fMonitorActive)
1755	{
1756	Log(("CSAMR3MonitorPage: activate monitoring for %VRv\n", pPageAddrGC));
1757
1758	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, pPageAddrGC, pPageAddrGC + (PAGE_SIZE - 1) /* inclusive! */,
1759	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1760	csamGetMonitorDescription(enmTag));
1761	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VRv failed with %Vrc\n", pPageAddrGC, rc));
1762	if (VBOX_FAILURE(rc))
1763	Log(("PGMR3HandlerVirtualRegisterEx for %VRv failed with %Vrc\n", pPageAddrGC, rc));
1764
1765	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1766
1767	/* Prefetch it in case it's not there yet. */
1768	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1769	AssertRC(rc);
1770
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	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1775
1776	pPageRec->page.fMonitorActive = true;
1777	pPageRec->page.fMonitorInvalidation = fMonitorInvalidation;
1778	}
1779	else
1780	if ( !pPageRec->page.fMonitorInvalidation
1781	&& fMonitorInvalidation)
1782	{
1783	Assert(pPageRec->page.fMonitorActive);
1784	PGMHandlerVirtualChangeInvalidateCallback(pVM, pPageRec->page.pPageGC, CSAMCodePageInvalidate);
1785	pPageRec->page.fMonitorInvalidation = true;
1786	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1787
1788	/* Prefetch it in case it's not there yet. */
1789	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1790	AssertRC(rc);
1791
1792	/* Make sure it's readonly. Page invalidation may have modified the attributes. */
1793	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1794	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1795	}
1796
1797	#if 0 /* def VBOX_STRICT -> very annoying) */
1798	if (pPageRec->page.fMonitorActive)
1799	{
1800	uint64_t fPageShw;
1801	RTHCPHYS GCPhys;
1802	rc = PGMShwGetPage(pVM, pPageAddrGC, &fPageShw, &GCPhys);
1803	// AssertMsg( (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1804	// \|\| !(fPageShw & X86_PTE_RW)
1805	// \|\| (pPageRec->page.GCPhys == 0), ("Shadow page flags for %VRv (%VHp) aren't readonly (%VX64)!!\n", pPageAddrGC, GCPhys, fPageShw));
1806	}
1807	#endif
1808
1809	if (pPageRec->page.GCPhys == 0)
1810	{
1811	/* Prefetch it in case it's not there yet. */
1812	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1813	AssertRC(rc);
1814	/* The page was changed behind our back. It won't be made read-only until the next SyncCR3, so force it here. */
1815	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1816	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1817	}
1818	#endif /* CSAM_MONITOR_CODE_PAGES */
1819	return VINF_SUCCESS;
1820	}
1821
1822	/**
1823	* Unmonitors a code page
1824	*
1825	* @returns VBox status code
1826	* @param pVM The VM to operate on.
1827	* @param pPageAddrGC The page to monitor
1828	* @param enmTag Monitor tag
1829	*/
1830	CSAMR3DECL(int) CSAMR3UnmonitorPage(PVM pVM, RTRCPTR pPageAddrGC, CSAMTAG enmTag)
1831	{
1832	pPageAddrGC &= PAGE_BASE_GC_MASK;
1833
1834	Log(("CSAMR3UnmonitorPage %VRv %d\n", pPageAddrGC, enmTag));
1835
1836	Assert(enmTag == CSAM_TAG_REM);
1837
1838	#ifdef VBOX_STRICT
1839	PCSAMPAGEREC pPageRec;
1840
1841	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1842	Assert(pPageRec && pPageRec->page.enmTag == enmTag);
1843	#endif
1844	return CSAMR3RemovePage(pVM, pPageAddrGC);
1845	}
1846
1847	/**
1848	* Removes a page record from our lookup tree
1849	*
1850	* @returns VBox status code
1851	* @param pVM The VM to operate on.
1852	* @param GCPtr Page address
1853	*/
1854	static int csamRemovePageRecord(PVM pVM, RTRCPTR GCPtr)
1855	{
1856	PCSAMPAGEREC pPageRec;
1857
1858	Log(("csamRemovePageRecord %VRv\n", GCPtr));
1859	pPageRec = (PCSAMPAGEREC)RTAvlPVRemove(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
1860
1861	if (pPageRec)
1862	{
1863	STAM_COUNTER_INC(&pVM->csam.s.StatNrRemovedPages);
1864
1865	#ifdef CSAM_MONITOR_CODE_PAGES
1866	if (pPageRec->page.fMonitorActive)
1867	{
1868	/* @todo -> this is expensive (cr3 reload)!!!
1869	* if this happens often, then reuse it instead!!!
1870	*/
1871	Assert(!fInCSAMCodePageInvalidate);
1872	STAM_COUNTER_DEC(&pVM->csam.s.StatPageMonitor);
1873	PGMHandlerVirtualDeregister(pVM, GCPtr);
1874	}
1875	if (pPageRec->page.enmTag == CSAM_TAG_PATM)
1876	{
1877	/* Make sure the recompiler flushes its cache as this page is no longer monitored. */
1878	STAM_COUNTER_INC(&pVM->csam.s.StatPageRemoveREMFlush);
1879	CPUMSetChangedFlags(pVM, CPUM_CHANGED_GLOBAL_TLB_FLUSH);
1880	}
1881	#endif
1882
1883	#ifdef VBOX_WITH_STATISTICS
1884	switch (pPageRec->page.enmTag)
1885	{
1886	case CSAM_TAG_CSAM:
1887	STAM_COUNTER_DEC(&pVM->csam.s.StatPageCSAM);
1888	break;
1889	case CSAM_TAG_PATM:
1890	STAM_COUNTER_DEC(&pVM->csam.s.StatPagePATM);
1891	break;
1892	case CSAM_TAG_REM:
1893	STAM_COUNTER_DEC(&pVM->csam.s.StatPageREM);
1894	break;
1895	default:
1896	break; /* to shut up GCC */
1897	}
1898	#endif
1899
1900	if (pPageRec->page.pBitmap) MMR3HeapFree(pPageRec->page.pBitmap);
1901	MMR3HeapFree(pPageRec);
1902	}
1903	else
1904	AssertFailed();
1905
1906	return VINF_SUCCESS;
1907	}
1908
1909	/**
1910	* Callback for delayed writes from non-EMT threads
1911	*
1912	* @param pVM VM Handle.
1913	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1914	* @param cbBuf How much it's reading/writing.
1915	*/
1916	static DECLCALLBACK(void) CSAMDelayedWriteHandler(PVM pVM, RTRCPTR GCPtr, size_t cbBuf)
1917	{
1918	int rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1919	AssertRC(rc);
1920	}
1921
1922	/**
1923	* #PF Handler callback for virtual access handler ranges.
1924	*
1925	* Important to realize that a physical page in a range can have aliases, and
1926	* for ALL and WRITE handlers these will also trigger.
1927	*
1928	* @returns VINF_SUCCESS if the handler have carried out the operation.
1929	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1930	* @param pVM VM Handle.
1931	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1932	* @param pvPtr The HC mapping of that address.
1933	* @param pvBuf What the guest is reading/writing.
1934	* @param cbBuf How much it's reading/writing.
1935	* @param enmAccessType The access type.
1936	* @param pvUser User argument.
1937	*/
1938	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1939	{
1940	int rc;
1941
1942	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1943	Log(("CSAMCodePageWriteHandler: write to %VGv size=%d\n", GCPtr, cbBuf));
1944
1945	if (VM_IS_EMT(pVM))
1946	{
1947	rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1948	}
1949	else
1950	{
1951	/* Queue the write instead otherwise we'll get concurrency issues. */
1952	/** @note in theory not correct to let it write the data first before disabling a patch!
1953	* (if it writes the same data as the patch jump and we replace it with obsolete opcodes)
1954	*/
1955	Log(("CSAMCodePageWriteHandler: delayed write!\n"));
1956	AssertCompileSize(RTRCPTR, 4);
1957	rc = VMR3ReqCallEx(pVM, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID,
1958	(PFNRT)CSAMDelayedWriteHandler, 3, pVM, (RTRCPTR)GCPtr, cbBuf);
1959	}
1960	AssertRC(rc);
1961
1962	return VINF_PGM_HANDLER_DO_DEFAULT;
1963	}
1964
1965	/**
1966	* #PF Handler callback for invalidation of virtual access handler ranges.
1967	*
1968	* @param pVM VM Handle.
1969	* @param GCPtr The virtual address the guest has changed.
1970	*/
1971	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr)
1972	{
1973	fInCSAMCodePageInvalidate = true;
1974	LogFlow(("CSAMCodePageInvalidate %VGv\n", GCPtr));
1975	/** @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. */
1976	csamFlushPage(pVM, GCPtr, false /* don't remove page! */);
1977	fInCSAMCodePageInvalidate = false;
1978	return VINF_SUCCESS;
1979	}
1980
1981	/**
1982	* Check if the current instruction has already been checked before
1983	*
1984	* @returns VBox status code. (trap handled or not)
1985	* @param pVM The VM to operate on.
1986	* @param pInstr Instruction pointer
1987	* @param pPage CSAM patch structure pointer
1988	*/
1989	bool csamIsCodeScanned(PVM pVM, RTRCPTR pInstr, PCSAMPAGE *pPage)
1990	{
1991	PCSAMPAGEREC pPageRec;
1992	uint32_t offset;
1993
1994	STAM_PROFILE_START(&pVM->csam.s.StatTimeCheckAddr, a);
1995
1996	offset = pInstr & PAGE_OFFSET_MASK;
1997	pInstr = pInstr & PAGE_BASE_GC_MASK;
1998
1999	Assert(pPage);
2000
2001	if (pPage && (pPage)->pPageGC == pInstr)
2002	{
2003	if ((pPage)->pBitmap == NULL \|\| ASMBitTest((pPage)->pBitmap, offset))
2004	{
2005	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
2006	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2007	return true;
2008	}
2009	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2010	return false;
2011	}
2012
2013	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstr);
2014	if (pPageRec)
2015	{
2016	if (pPage) *pPage= &pPageRec->page;
2017	if (pPageRec->page.pBitmap == NULL \|\| ASMBitTest(pPageRec->page.pBitmap, offset))
2018	{
2019	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
2020	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2021	return true;
2022	}
2023	}
2024	else
2025	{
2026	if (pPage) *pPage = NULL;
2027	}
2028	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
2029	return false;
2030	}
2031
2032	/**
2033	* Mark an instruction in a page as scanned/not scanned
2034	*
2035	* @param pVM The VM to operate on.
2036	* @param pPage Patch structure pointer
2037	* @param pInstr Instruction pointer
2038	* @param opsize Instruction size
2039	* @param fScanned Mark as scanned or not
2040	*/
2041	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTRCPTR pInstr, uint32_t opsize, bool fScanned)
2042	{
2043	LogFlow(("csamMarkCodeAsScanned %VRv opsize=%d\n", pInstr, opsize));
2044	CSAMMarkPage(pVM, pInstr, fScanned);
2045
2046	/** @todo should recreate empty bitmap if !fScanned */
2047	if (pPage->pBitmap == NULL)
2048	return;
2049
2050	if (fScanned)
2051	{
2052	// retn instructions can be scanned more than once
2053	if (ASMBitTest(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK) == 0)
2054	{
2055	pPage->uSize += opsize;
2056	STAM_COUNTER_ADD(&pVM->csam.s.StatNrInstr, 1);
2057	}
2058	if (pPage->uSize >= PAGE_SIZE)
2059	{
2060	Log(("Scanned full page (%VRv) -> free bitmap\n", pInstr & PAGE_BASE_GC_MASK));
2061	MMR3HeapFree(pPage->pBitmap);
2062	pPage->pBitmap = NULL;
2063	}
2064	else
2065	ASMBitSet(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2066	}
2067	else
2068	ASMBitClear(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2069	}
2070
2071	/**
2072	* Mark an instruction in a page as scanned/not scanned
2073	*
2074	* @returns VBox status code.
2075	* @param pVM The VM to operate on.
2076	* @param pInstr Instruction pointer
2077	* @param opsize Instruction size
2078	* @param fScanned Mark as scanned or not
2079	*/
2080	CSAMR3DECL(int) CSAMR3MarkCode(PVM pVM, RTRCPTR pInstr, uint32_t opsize, bool fScanned)
2081	{
2082	PCSAMPAGE pPage = 0;
2083
2084	Assert(!fScanned); /* other case not implemented. */
2085	Assert(!PATMIsPatchGCAddr(pVM, pInstr));
2086
2087	if (csamIsCodeScanned(pVM, pInstr, &pPage) == false)
2088	{
2089	Assert(fScanned == true); /* other case should not be possible */
2090	return VINF_SUCCESS;
2091	}
2092
2093	Log(("CSAMR3MarkCode: %VRv size=%d fScanned=%d\n", pInstr, opsize, fScanned));
2094	csamMarkCode(pVM, pPage, pInstr, opsize, fScanned);
2095	return VINF_SUCCESS;
2096	}
2097
2098
2099	/**
2100	* Scan and analyse code
2101	*
2102	* @returns VBox status code.
2103	* @param pVM The VM to operate on.
2104	* @param pCtxCore CPU context
2105	* @param pInstrGC Instruction pointer
2106	*/
2107	CSAMR3DECL(int) CSAMR3CheckCodeEx(PVM pVM, PCPUMCTXCORE pCtxCore, RTRCPTR pInstrGC)
2108	{
2109	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2110	{
2111	// No use
2112	return VINF_SUCCESS;
2113	}
2114
2115	if (CSAMIsEnabled(pVM))
2116	{
2117	/* Assuming 32 bits code for now. */
2118	Assert(SELMGetCpuModeFromSelector(pVM, pCtxCore->eflags, pCtxCore->cs, &pCtxCore->csHid) == CPUMODE_32BIT);
2119
2120	pInstrGC = SELMToFlat(pVM, DIS_SELREG_CS, pCtxCore, pInstrGC);
2121	return CSAMR3CheckCode(pVM, pInstrGC);
2122	}
2123	return VINF_SUCCESS;
2124	}
2125
2126	/**
2127	* Scan and analyse code
2128	*
2129	* @returns VBox status code.
2130	* @param pVM The VM to operate on.
2131	* @param pInstrGC Instruction pointer (0:32 virtual address)
2132	*/
2133	CSAMR3DECL(int) CSAMR3CheckCode(PVM pVM, RTRCPTR pInstrGC)
2134	{
2135	int rc;
2136	PCSAMPAGE pPage = NULL;
2137
2138	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2139	{
2140	// No use
2141	return VINF_SUCCESS;
2142	}
2143
2144	if (CSAMIsEnabled(pVM))
2145	{
2146	// Cache record for PATMGCVirtToHCVirt
2147	CSAMP2GLOOKUPREC cacheRec = {0};
2148
2149	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2150	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, pInstrGC, true /* 32 bits code */, CSAMR3AnalyseCallback, pPage, &cacheRec);
2151	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2152	if (rc != VINF_SUCCESS)
2153	{
2154	Log(("csamAnalyseCodeStream failed with %d\n", rc));
2155	return rc;
2156	}
2157	}
2158	return VINF_SUCCESS;
2159	}
2160
2161	/**
2162	* Flush dirty code pages
2163	*
2164	* @returns VBox status code.
2165	* @param pVM The VM to operate on.
2166	*/
2167	static int csamR3FlushDirtyPages(PVM pVM)
2168	{
2169	STAM_PROFILE_START(&pVM->csam.s.StatFlushDirtyPages, a);
2170
2171	for (uint32_t i=0;i<pVM->csam.s.cDirtyPages;i++)
2172	{
2173	int rc;
2174	PCSAMPAGEREC pPageRec;
2175	RTRCPTR GCPtr = pVM->csam.s.pvDirtyBasePage[i];
2176
2177	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2178
2179	/* Notify the recompiler that this page has been changed. */
2180	REMR3NotifyCodePageChanged(pVM, GCPtr);
2181
2182	/* Enable write protection again. (use the fault address as it might be an alias) */
2183	rc = PGMShwModifyPage(pVM, pVM->csam.s.pvDirtyFaultPage[i], 1, 0, ~(uint64_t)X86_PTE_RW);
2184	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2185
2186	Log(("CSAMR3FlushDirtyPages: flush %VRv (modifypage rc=%Vrc)\n", pVM->csam.s.pvDirtyBasePage[i], rc));
2187
2188	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
2189	if (pPageRec && pPageRec->page.enmTag == CSAM_TAG_REM)
2190	{
2191	uint64_t fFlags;
2192
2193	rc = PGMGstGetPage(pVM, GCPtr, &fFlags, NULL);
2194	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
2195	if ( rc == VINF_SUCCESS
2196	&& (fFlags & X86_PTE_US))
2197	{
2198	/* We don't care about user pages. */
2199	csamRemovePageRecord(pVM, GCPtr);
2200	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
2201	}
2202	}
2203	}
2204	pVM->csam.s.cDirtyPages = 0;
2205	STAM_PROFILE_STOP(&pVM->csam.s.StatFlushDirtyPages, a);
2206	return VINF_SUCCESS;
2207	}
2208
2209	/**
2210	* Flush potential new code pages
2211	*
2212	* @returns VBox status code.
2213	* @param pVM The VM to operate on.
2214	*/
2215	static int csamR3FlushCodePages(PVM pVM)
2216	{
2217	for (uint32_t i=0;i<pVM->csam.s.cPossibleCodePages;i++)
2218	{
2219	RTRCPTR GCPtr = pVM->csam.s.pvPossibleCodePage[i];
2220
2221	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2222
2223	Log(("csamR3FlushCodePages: %VRv\n", GCPtr));
2224	PGMShwSetPage(pVM, GCPtr, 1, 0);
2225	/* Resync the page to make sure instruction fetch will fault */
2226	CSAMMarkPage(pVM, GCPtr, false);
2227	}
2228	pVM->csam.s.cPossibleCodePages = 0;
2229	return VINF_SUCCESS;
2230	}
2231
2232	/**
2233	* Perform any pending actions
2234	*
2235	* @returns VBox status code.
2236	* @param pVM The VM to operate on.
2237	*/
2238	CSAMR3DECL(int) CSAMR3DoPendingAction(PVM pVM)
2239	{
2240	csamR3FlushDirtyPages(pVM);
2241	csamR3FlushCodePages(pVM);
2242
2243	VM_FF_CLEAR(pVM, VM_FF_CSAM_PENDING_ACTION);
2244	return VINF_SUCCESS;
2245	}
2246
2247	/**
2248	* Analyse interrupt and trap gates
2249	*
2250	* @returns VBox status code.
2251	* @param pVM The VM to operate on.
2252	* @param iGate Start gate
2253	* @param cGates Number of gates to check
2254	*/
2255	CSAMR3DECL(int) CSAMR3CheckGates(PVM pVM, uint32_t iGate, uint32_t cGates)
2256	{
2257	uint16_t cbIDT;
2258	RTRCPTR GCPtrIDT = CPUMGetGuestIDTR(pVM, &cbIDT);
2259	uint32_t iGateEnd;
2260	uint32_t maxGates;
2261	VBOXIDTE aIDT[256];
2262	PVBOXIDTE pGuestIdte;
2263	int rc;
2264
2265	if (EMIsRawRing0Enabled(pVM) == false)
2266	{
2267	/* Enabling interrupt gates only works when raw ring 0 is enabled. */
2268	//AssertFailed();
2269	return VINF_SUCCESS;
2270	}
2271
2272	/* We only check all gates once during a session */
2273	if ( !pVM->csam.s.fGatesChecked
2274	&& cGates != 256)
2275	return VINF_SUCCESS; /* too early */
2276
2277	/* We only check all gates once during a session */
2278	if ( pVM->csam.s.fGatesChecked
2279	&& cGates != 1)
2280	return VINF_SUCCESS; /* ignored */
2281
2282	Assert(cGates <= 256);
2283	if (!GCPtrIDT \|\| cGates > 256)
2284	return VERR_INVALID_PARAMETER;
2285
2286	if (cGates != 1)
2287	{
2288	pVM->csam.s.fGatesChecked = true;
2289	for (unsigned i=0;i<RT_ELEMENTS(pVM->csam.s.pvCallInstruction);i++)
2290	{
2291	RTRCPTR pHandler = pVM->csam.s.pvCallInstruction[i];
2292
2293	if (pHandler)
2294	{
2295	CSAMP2GLOOKUPREC cacheRec = {0}; /* Cache record for PATMGCVirtToHCVirt. */
2296	PCSAMPAGE pPage = NULL;
2297
2298	Log(("CSAMCheckGates: checking previous call instruction %VRv\n", pHandler));
2299	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2300	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2301	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2302	if (rc != VINF_SUCCESS)
2303	{
2304	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2305	continue;
2306	}
2307	}
2308	}
2309	}
2310
2311	/* Determine valid upper boundary. */
2312	maxGates = (cbIDT+1) / sizeof(VBOXIDTE);
2313	Assert(iGate < maxGates);
2314	if (iGate > maxGates)
2315	return VERR_INVALID_PARAMETER;
2316
2317	if (iGate + cGates > maxGates)
2318	cGates = maxGates - iGate;
2319
2320	GCPtrIDT = GCPtrIDT + iGate * sizeof(VBOXIDTE);
2321	iGateEnd = iGate + cGates;
2322
2323	STAM_PROFILE_START(&pVM->csam.s.StatCheckGates, a);
2324
2325	/*
2326	* Get IDT entries.
2327	*/
2328	if (PAGE_ADDRESS(GCPtrIDT) == PAGE_ADDRESS(GCPtrIDT+cGates*sizeof(VBOXIDTE)))
2329	{
2330	/* Just convert the IDT address to a HC pointer. The whole IDT fits in one page. */
2331	rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrIDT, (PRTHCPTR)&pGuestIdte);
2332	if (VBOX_FAILURE(rc))
2333	{
2334	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2335	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2336	return rc;
2337	}
2338	}
2339	else
2340	{
2341	/* Slow method when it crosses a page boundary. */
2342	rc = PGMPhysReadGCPtr(pVM, aIDT, GCPtrIDT, cGates*sizeof(VBOXIDTE));
2343	if (VBOX_FAILURE(rc))
2344	{
2345	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2346	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2347	return rc;
2348	}
2349	pGuestIdte = &aIDT[0];
2350	}
2351
2352	for (/iGate/; iGate<iGateEnd; iGate++, pGuestIdte++)
2353	{
2354	Assert(TRPMR3GetGuestTrapHandler(pVM, iGate) == TRPM_INVALID_HANDLER);
2355
2356	if ( pGuestIdte->Gen.u1Present
2357	&& (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
2358	&& (pGuestIdte->Gen.u2DPL == 3 \|\| pGuestIdte->Gen.u2DPL == 0)
2359	)
2360	{
2361	RTRCPTR pHandler;
2362	CSAMP2GLOOKUPREC cacheRec = {0}; /* Cache record for PATMGCVirtToHCVirt. */
2363	PCSAMPAGE pPage = NULL;
2364	SELMSELINFO selInfo;
2365
2366	pHandler = VBOXIDTE_OFFSET(*pGuestIdte);
2367	pHandler = SELMToFlatBySel(pVM, pGuestIdte->Gen.u16SegSel, pHandler);
2368
2369	rc = SELMR3GetSelectorInfo(pVM, pGuestIdte->Gen.u16SegSel, &selInfo);
2370	if ( VBOX_FAILURE(rc)
2371	\|\| selInfo.GCPtrBase != 0
2372	\|\| selInfo.cbLimit != ~0U
2373	)
2374	{
2375	/* Refuse to patch a handler whose idt cs selector isn't wide open. */
2376	Log(("CSAMCheckGates: check gate %d failed due to rc %Vrc GCPtrBase=%VRv limit=%x\n", iGate, rc, selInfo.GCPtrBase, selInfo.cbLimit));
2377	continue;
2378	}
2379
2380
2381	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2382	{
2383	Log(("CSAMCheckGates: check trap gate %d at %04X:%08X (flat %VRv)\n", iGate, pGuestIdte->Gen.u16SegSel, VBOXIDTE_OFFSET(*pGuestIdte), pHandler));
2384	}
2385	else
2386	{
2387	Log(("CSAMCheckGates: check interrupt gate %d at %04X:%08X (flat %VRv)\n", iGate, pGuestIdte->Gen.u16SegSel, VBOXIDTE_OFFSET(*pGuestIdte), pHandler));
2388	}
2389
2390	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2391	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2392	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2393	if (rc != VINF_SUCCESS)
2394	{
2395	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2396	continue;
2397	}
2398	/* OpenBSD guest specific patch test. */
2399	if (iGate >= 0x20)
2400	{
2401	PCPUMCTX pCtx;
2402	DISCPUSTATE cpu;
2403	RTGCUINTPTR32 aOpenBsdPushCSOffset[3] = {0x03, /* OpenBSD 3.7 & 3.8 */
2404	0x2B, /* OpenBSD 4.0 installation ISO */
2405	0x2F}; /* OpenBSD 4.0 after install */
2406
2407	rc = CPUMQueryGuestCtxPtr(pVM, &pCtx);
2408	AssertRC(rc); /* can't fail */
2409
2410	for (unsigned i=0;i<RT_ELEMENTS(aOpenBsdPushCSOffset);i++)
2411	{
2412	rc = CPUMR3DisasmInstrCPU(pVM, pCtx, pHandler - aOpenBsdPushCSOffset[i], &cpu, NULL);
2413	if ( rc == VINF_SUCCESS
2414	&& cpu.pCurInstr->opcode == OP_PUSH
2415	&& cpu.pCurInstr->param1 == OP_PARM_REG_CS)
2416	{
2417	rc = PATMR3InstallPatch(pVM, pHandler - aOpenBsdPushCSOffset[i], PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2418	if (VBOX_SUCCESS(rc))
2419	Log(("Installed OpenBSD interrupt handler prefix instruction (push cs) patch\n"));
2420	}
2421	}
2422	}
2423
2424	/* Trap gates and certain interrupt gates. */
2425	uint32_t fPatchFlags = PATMFL_CODE32 \| PATMFL_IDTHANDLER;
2426
2427	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2428	fPatchFlags \|= PATMFL_TRAPHANDLER;
2429	else
2430	fPatchFlags \|= PATMFL_INTHANDLER;
2431
2432	switch (iGate) {
2433	case 8:
2434	case 10:
2435	case 11:
2436	case 12:
2437	case 13:
2438	case 14:
2439	case 17:
2440	fPatchFlags \|= PATMFL_TRAPHANDLER_WITH_ERRORCODE;
2441	break;
2442	default:
2443	/* No error code. */
2444	break;
2445	}
2446
2447	Log(("Installing %s gate handler for 0x%X at %VRv\n", (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32) ? "trap" : "intr", iGate, pHandler));
2448
2449	rc = PATMR3InstallPatch(pVM, pHandler, fPatchFlags);
2450	if (VBOX_SUCCESS(rc) \|\| rc == VERR_PATM_ALREADY_PATCHED)
2451	{
2452	Log(("Gate handler 0x%X is SAFE!\n", iGate));
2453
2454	RTRCPTR pNewHandlerGC = PATMR3QueryPatchGCPtr(pVM, pHandler);
2455	if (pNewHandlerGC)
2456	{
2457	rc = TRPMR3SetGuestTrapHandler(pVM, iGate, pNewHandlerGC);
2458	if (VBOX_FAILURE(rc))
2459	Log(("TRPMR3SetGuestTrapHandler %d failed with %Vrc\n", iGate, rc));
2460	}
2461	}
2462	}
2463	} /* for */
2464	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2465	return VINF_SUCCESS;
2466	}
2467
2468	/**
2469	* Record previous call instruction addresses
2470	*
2471	* @returns VBox status code.
2472	* @param pVM The VM to operate on.
2473	* @param GCPtrCall Call address
2474	*/
2475	CSAMR3DECL(int) CSAMR3RecordCallAddress(PVM pVM, RTRCPTR GCPtrCall)
2476	{
2477	for (unsigned i=0;i<RT_ELEMENTS(pVM->csam.s.pvCallInstruction);i++)
2478	{
2479	if (pVM->csam.s.pvCallInstruction[i] == GCPtrCall)
2480	return VINF_SUCCESS;
2481	}
2482
2483	Log(("CSAMR3RecordCallAddress %VRv\n", GCPtrCall));
2484
2485	pVM->csam.s.pvCallInstruction[pVM->csam.s.iCallInstruction++] = GCPtrCall;
2486	if (pVM->csam.s.iCallInstruction >= RT_ELEMENTS(pVM->csam.s.pvCallInstruction))
2487	pVM->csam.s.iCallInstruction = 0;
2488
2489	return VINF_SUCCESS;
2490	}
2491
2492
2493	/**
2494	* Query CSAM state (enabled/disabled)
2495	*
2496	* @returns 0 - disabled, 1 - enabled
2497	* @param pVM The VM to operate on.
2498	*/
2499	CSAMR3DECL(int) CSAMR3IsEnabled(PVM pVM)
2500	{
2501	return pVM->fCSAMEnabled;
2502	}
2503
2504	#ifdef VBOX_WITH_DEBUGGER
2505	/**
2506	* The '.csamoff' command.
2507	*
2508	* @returns VBox status.
2509	* @param pCmd Pointer to the command descriptor (as registered).
2510	* @param pCmdHlp Pointer to command helper functions.
2511	* @param pVM Pointer to the current VM (if any).
2512	* @param paArgs Pointer to (readonly) array of arguments.
2513	* @param cArgs Number of arguments in the array.
2514	*/
2515	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2516	{
2517	/*
2518	* Validate input.
2519	*/
2520	if (!pVM)
2521	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2522
2523	CSAMDisableScanning(pVM);
2524	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning disabled\n");
2525	}
2526
2527	/**
2528	* The '.csamon' command.
2529	*
2530	* @returns VBox status.
2531	* @param pCmd Pointer to the command descriptor (as registered).
2532	* @param pCmdHlp Pointer to command helper functions.
2533	* @param pVM Pointer to the current VM (if any).
2534	* @param paArgs Pointer to (readonly) array of arguments.
2535	* @param cArgs Number of arguments in the array.
2536	*/
2537	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2538	{
2539	/*
2540	* Validate input.
2541	*/
2542	if (!pVM)
2543	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2544
2545	CSAMEnableScanning(pVM);
2546	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning enabled\n");
2547	}
2548	#endif

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source: vbox/trunk/src/VBox/VMM/PATM/CSAM.cpp@ 12329

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