CSAM.cpp@ 3020

Last change on this file since 3020 was 3020, checked in by vboxsync, 17 years ago
Added missing space after ')' in macro invocations so VCC doesn't mess up the precompiler output.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 87.2 KB

Line
1	/* $Id: CSAM.cpp 3020 2007-06-04 12:01:53Z vboxsync $ */
2	/** @file
3	* CSAM - Guest OS Code Scanning and Analysis Manager
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek 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	/* 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, RTGCPTR pInstr, PCSAMPAGE *pPage);
77	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstr);
78	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
79	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr);
80	static int csamReinit(PVM pVM);
81	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned);
82	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(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(RTGCPTR), 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], 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	/** @note never mess with the pgdir bitmap here! */
241	return VINF_SUCCESS;
242	}
243
244	/**
245	* Applies relocations to data and code managed by this
246	* component. This function will be called at init and
247	* whenever the VMM need to relocate itself inside the GC.
248	*
249	* The csam will update the addresses used by the switcher.
250	*
251	* @param pVM The VM.
252	* @param offDelta Relocation delta.
253	*/
254	CSAMR3DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
255	{
256	if (offDelta)
257	{
258	/* Adjust pgdir and page bitmap pointers. */
259	pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
260	pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
261
262	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
263	{
264	if (pVM->csam.s.pPDGCBitmapHC[i])
265	{
266	pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
267	}
268	}
269	}
270	return;
271	}
272
273	/**
274	* Terminates the csam.
275	*
276	* Termination means cleaning up and freeing all resources,
277	* the VM it self is at this point powered off or suspended.
278	*
279	* @returns VBox status code.
280	* @param pVM The VM to operate on.
281	*/
282	CSAMR3DECL(int) CSAMR3Term(PVM pVM)
283	{
284	int rc;
285
286	rc = CSAMR3Reset(pVM);
287	AssertRC(rc);
288
289	/* @todo triggers assertion in MMHyperFree */
290	#if 0
291	for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
292	{
293	if (pVM->csam.s.pPDBitmapHC[i])
294	MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
295	}
296	#endif
297
298	return VINF_SUCCESS;
299	}
300
301	/**
302	* CSAM reset callback.
303	*
304	* @returns VBox status code.
305	* @param pVM The VM which is reset.
306	*/
307	CSAMR3DECL(int) CSAMR3Reset(PVM pVM)
308	{
309	/* Clear page bitmaps. */
310	for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
311	{
312	if (pVM->csam.s.pPDBitmapHC[i])
313	{
314	Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
315	ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
316	}
317	}
318
319	/* Remove all CSAM page records. */
320	while(true)
321	{
322	PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
323	if (pPageRec)
324	{
325	csamRemovePageRecord(pVM, pPageRec->page.pPageGC);
326	}
327	else
328	break;
329	}
330	Assert(!pVM->csam.s.pPageTree);
331
332	csamReinit(pVM);
333
334	return VINF_SUCCESS;
335	}
336
337	#define CSAM_SUBTRACT_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) - (uintptr_t)(b)
338	#define CSAM_ADD_PTR(a, b) (uintptr_t )&(a) = (uintptr_t)(a) + (uintptr_t)(b)
339
340
341	/**
342	* Callback function for RTAvlPVDoWithAll
343	*
344	* Counts the number of records in the tree
345	*
346	* @returns VBox status code.
347	* @param pNode Current node
348	* @param pcPatches Pointer to patch counter
349	*/
350	static DECLCALLBACK(int) CountRecord(PAVLPVNODECORE pNode, void *pcPatches)
351	{
352	(uint32_t )pcPatches = (uint32_t )pcPatches + 1;
353	return VINF_SUCCESS;
354	}
355
356	/**
357	* Callback function for RTAvlPVDoWithAll
358	*
359	* Saves the state of the page record
360	*
361	* @returns VBox status code.
362	* @param pNode Current node
363	* @param pVM1 VM Handle
364	*/
365	static DECLCALLBACK(int) SavePageState(PAVLPVNODECORE pNode, void *pVM1)
366	{
367	PVM pVM = (PVM)pVM1;
368	PCSAMPAGEREC pPage = (PCSAMPAGEREC)pNode;
369	CSAMPAGEREC page = *pPage;
370	PSSMHANDLE pSSM = pVM->csam.s.savedstate.pSSM;
371	int rc;
372
373	/* Save the page record itself */
374	rc = SSMR3PutMem(pSSM, &page, sizeof(page));
375	AssertRCReturn(rc, rc);
376
377	if (page.page.pBitmap)
378	{
379	rc = SSMR3PutMem(pSSM, page.page.pBitmap, CSAM_PAGE_BITMAP_SIZE);
380	AssertRCReturn(rc, rc);
381	}
382
383	return VINF_SUCCESS;
384	}
385
386	/**
387	* Execute state save operation.
388	*
389	* @returns VBox status code.
390	* @param pVM VM Handle.
391	* @param pSSM SSM operation handle.
392	*/
393	static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM)
394	{
395	CSAM csamInfo = pVM->csam.s;
396	int rc;
397
398	/*
399	* Count the number of page records in the tree (feeling lazy)
400	*/
401	csamInfo.savedstate.cPageRecords = 0;
402	RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, CountRecord, &csamInfo.savedstate.cPageRecords);
403
404	/*
405	* Save CSAM structure
406	*/
407	pVM->csam.s.savedstate.pSSM = pSSM;
408	rc = SSMR3PutMem(pSSM, &csamInfo, sizeof(csamInfo));
409	AssertRCReturn(rc, rc);
410
411	/* Save pgdir bitmap */
412	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
413	AssertRCReturn(rc, rc);
414
415	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
416	{
417	if(csamInfo.pPDBitmapHC[i])
418	{
419	/* Save the page bitmap. */
420	rc = SSMR3PutMem(pSSM, csamInfo.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
421	AssertRCReturn(rc, rc);
422	}
423	}
424
425	/*
426	* Save page records
427	*/
428	rc = RTAvlPVDoWithAll(&pVM->csam.s.pPageTree, true, SavePageState, pVM);
429	AssertRCReturn(rc, rc);
430
431	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
432	return VINF_SUCCESS;
433	}
434
435	/**
436	* Execute state load operation.
437	*
438	* @returns VBox status code.
439	* @param pVM VM Handle.
440	* @param pSSM SSM operation handle.
441	* @param u32Version Data layout version.
442	*/
443	static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version)
444	{
445	int rc;
446	CSAM csamInfo;
447
448	if (u32Version != CSAM_SSM_VERSION)
449	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
450
451	pVM->csam.s.savedstate.pSSM = pSSM;
452
453	/*
454	* Restore CSAM structure
455	*/
456	rc = SSMR3GetMem(pSSM, &csamInfo, sizeof(csamInfo));
457	AssertRCReturn(rc, rc);
458
459	pVM->csam.s.fGatesChecked = csamInfo.fGatesChecked;
460	pVM->csam.s.fScanningStarted = csamInfo.fScanningStarted;
461
462	/* Restore dirty code page info. */
463	pVM->csam.s.cDirtyPages = csamInfo.cDirtyPages;
464	memcpy(pVM->csam.s.pvDirtyBasePage, csamInfo.pvDirtyBasePage, sizeof(pVM->csam.s.pvDirtyBasePage));
465	memcpy(pVM->csam.s.pvDirtyFaultPage, csamInfo.pvDirtyFaultPage, sizeof(pVM->csam.s.pvDirtyFaultPage));
466
467	/* Restore possible code page */
468	pVM->csam.s.cPossibleCodePages = csamInfo.cPossibleCodePages;
469	memcpy(pVM->csam.s.pvPossibleCodePage, csamInfo.pvPossibleCodePage, sizeof(pVM->csam.s.pvPossibleCodePage));
470
471	/* Restore pgdir bitmap (we'll change the pointers next). */
472	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR));
473	AssertRCReturn(rc, rc);
474
475	/*
476	* Restore page bitmaps
477	*/
478	for (unsigned i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
479	{
480	if(pVM->csam.s.pPDBitmapHC[i])
481	{
482	rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC[i]);
483	if (VBOX_FAILURE(rc))
484	{
485	Log(("MMR3HyperAlloc failed with %d\n", rc));
486	return rc;
487	}
488	/* Convert to GC pointer. */
489	pVM->csam.s.pPDGCBitmapHC[i] = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC[i]);
490	Assert(pVM->csam.s.pPDGCBitmapHC[i]);
491
492	/* Restore the bitmap. */
493	rc = SSMR3GetMem(pSSM, pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
494	AssertRCReturn(rc, rc);
495	}
496	else
497	{
498	Assert(!pVM->csam.s.pPDGCBitmapHC[i]);
499	pVM->csam.s.pPDGCBitmapHC[i] = 0;
500	}
501	}
502
503	/*
504	* Restore page records
505	*/
506	for (uint32_t i=0;i<csamInfo.savedstate.cPageRecords + csamInfo.savedstate.cPatchPageRecords;i++)
507	{
508	CSAMPAGEREC page;
509	PCSAMPAGE pPage;
510
511	rc = SSMR3GetMem(pSSM, &page, sizeof(page));
512	AssertRCReturn(rc, rc);
513
514	/*
515	* Recreate the page record
516	*/
517	pPage = csamCreatePageRecord(pVM, page.page.pPageGC, page.page.enmTag, page.page.fCode32, page.page.fMonitorInvalidation);
518	AssertReturn(pPage, VERR_NO_MEMORY);
519
520	pPage->GCPhys = page.page.GCPhys;
521	pPage->fFlags = page.page.fFlags;
522	pPage->u64Hash = page.page.u64Hash;
523
524	if (page.page.pBitmap)
525	{
526	rc = SSMR3GetMem(pSSM, pPage->pBitmap, CSAM_PAGE_BITMAP_SIZE);
527	AssertRCReturn(rc, rc);
528	}
529	else
530	{
531	MMR3HeapFree(pPage->pBitmap);
532	pPage->pBitmap = 0;
533	}
534	}
535
536	/** @note we don't restore aDangerousInstr; it will be recreated automatically. */
537	memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
538	pVM->csam.s.cDangerousInstr = 0;
539	pVM->csam.s.iDangerousInstr = 0;
540	return VINF_SUCCESS;
541	}
542
543	/**
544	* Convert guest context address to host context pointer
545	*
546	* @returns VBox status code.
547	* @param pVM The VM to operate on.
548	* @param pCacheRec Address conversion cache record
549	* @param pGCPtr Guest context pointer
550	*
551	* @returns Host context pointer or NULL in case of an error
552	*
553	*/
554	static HCPTRTYPE(void ) CSAMGCVirtToHCVirt(PVM pVM, PCSAMP2GLOOKUPREC pCacheRec, GCPTRTYPE(uint8_t ) pGCPtr)
555	{
556	int rc;
557	HCPTRTYPE(void *) pHCPtr;
558
559	STAM_PROFILE_START(&pVM->csam.s.StatTimeAddrConv, a);
560
561	pHCPtr = PATMR3GCPtrToHCPtr(pVM, pGCPtr);
562	if (pHCPtr) return pHCPtr;
563
564	if (pCacheRec->pPageLocStartHC)
565	{
566	uint32_t offset = pGCPtr & PAGE_OFFSET_MASK;
567	if (pCacheRec->pGuestLoc == (pGCPtr & PAGE_BASE_GC_MASK))
568	{
569	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
570	return pCacheRec->pPageLocStartHC + offset;
571	}
572	}
573
574	rc = PGMPhysGCPtr2HCPtr(pVM, pGCPtr, &pHCPtr);
575	if (rc != VINF_SUCCESS)
576	{
577	//// AssertMsgRC(rc, ("MMR3PhysGCVirt2HCVirtEx failed for %VGv\n", pGCPtr));
578	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
579	return NULL;
580	}
581	////invalid? Assert(sizeof(HCPTRTYPE(uint8_t*)) == sizeof(uint32_t));
582
583	pCacheRec->pPageLocStartHC = (HCPTRTYPE(uint8_t*))((RTHCUINTPTR)pHCPtr & PAGE_BASE_HC_MASK);
584	pCacheRec->pGuestLoc = pGCPtr & PAGE_BASE_GC_MASK;
585	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeAddrConv, a);
586	return pHCPtr;
587	}
588
589	/**
590	* Read callback for disassembly function; supports reading bytes that cross a page boundary
591	*
592	* @returns VBox status code.
593	* @param pSrc GC source pointer
594	* @param pDest HC destination pointer
595	* @param size Number of bytes to read
596	* @param dwUserdata Callback specific user data (pCpu)
597	*
598	*/
599	int32_t CSAMR3ReadBytes(RTHCUINTPTR pSrc, uint8_t *pDest, uint32_t size, RTHCUINTPTR dwUserdata)
600	{
601	DISCPUSTATE pCpu = (DISCPUSTATE )dwUserdata;
602	PVM pVM = (PVM)pCpu->dwUserData[0];
603	RTHCUINTPTR pInstrHC = pCpu->dwUserData[1];
604	RTGCUINTPTR pInstrGC = pCpu->dwUserData[2];
605	int orgsize = size;
606
607	Assert(sizeof(RTHCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
608	Assert(sizeof(RTGCUINTPTR) <= sizeof(pCpu->dwUserData[0]));
609
610	/* We are not interested in patched instructions, so read the original opcode bytes. */
611	/** @note single instruction patches (int3) are checked in CSAMR3AnalyseCallback */
612	for (int i=0;i<orgsize;i++)
613	{
614	int rc = PATMR3QueryOpcode(pVM, (RTGCPTR)pSrc, pDest);
615	if (VBOX_SUCCESS(rc))
616	{
617	pSrc++;
618	pDest++;
619	size--;
620	}
621	else
622	break;
623	}
624	if (size == 0)
625	return VINF_SUCCESS;
626
627	if (PAGE_ADDRESS(pInstrGC) != PAGE_ADDRESS(pSrc + size - 1) && !PATMIsPatchGCAddr(pVM, pSrc))
628	{
629	return PGMPhysReadGCPtr(pVM, pDest, pSrc, size);
630	}
631	else
632	{
633	Assert(pInstrHC);
634
635	/* pInstrHC is the base address; adjust according to the GC pointer. */
636	pInstrHC = pInstrHC + (pSrc - pInstrGC);
637
638	memcpy(pDest, (void *)pInstrHC, size);
639	}
640
641	return VINF_SUCCESS;
642	}
643
644	inline bool CSAMR3DISInstr(PVM pVM, DISCPUSTATE pCpu, RTGCPTR InstrGC, uint8_t InstrHC, uint32_t pOpsize, char pszOutput)
645	{
646	(pCpu)->pfnReadBytes = CSAMR3ReadBytes;
647	(pCpu)->dwUserData[0] = (RTHCUINTPTR)pVM;
648	(pCpu)->dwUserData[1] = (RTHCUINTPTR)InstrHC;
649	(pCpu)->dwUserData[2] = (RTHCUINTPTR)InstrGC;
650	#ifdef DEBUG
651	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, OPTYPE_ALL);
652	#else
653	/* We are interested in everything except harmless stuff */
654	return DISInstrEx(pCpu, InstrGC, 0, pOpsize, pszOutput, ~(OPTYPE_INVALID \| OPTYPE_HARMLESS \| OPTYPE_RRM_MASK));
655	#endif
656	}
657
658	/**
659	* Analyses the instructions following the cli for compliance with our heuristics for cli
660	*
661	* @returns VBox status code.
662	* @param pVM The VM to operate on.
663	* @param pCpu CPU disassembly state
664	* @param pInstrGC Guest context pointer to privileged instruction
665	* @param pCurInstrGC Guest context pointer to the current instruction
666	* @param pCacheRec GC to HC cache record
667	* @param pUserData User pointer (callback specific)
668	*
669	*/
670	static int CSAMR3AnalyseCallback(PVM pVM, DISCPUSTATE pCpu, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t *) pCurInstrGC,
671	PCSAMP2GLOOKUPREC pCacheRec, void *pUserData)
672	{
673	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
674	int rc;
675
676	switch(pCpu->pCurInstr->opcode)
677	{
678	case OP_INT:
679	Assert(pCpu->param1.flags & USE_IMMEDIATE8);
680	if (pCpu->param1.parval == 3)
681	{
682	//two byte int 3
683	return VINF_SUCCESS;
684	}
685	break;
686
687	case OP_ILLUD2:
688	/* This appears to be some kind of kernel panic in Linux 2.4; no point to continue. */
689	case OP_RETN:
690	case OP_INT3:
691	case OP_INVALID:
692	#if 1
693	/* removing breaks win2k guests? */
694	case OP_IRET:
695	#endif
696	return VINF_SUCCESS;
697	}
698
699	// Check for exit points
700	switch (pCpu->pCurInstr->opcode)
701	{
702	/* It's not a good idea to patch pushf instructions:
703	* - increases the chance of conflicts (code jumping to the next instruction)
704	* - better to patch the cli
705	* - code that branches before the cli will likely hit an int 3
706	* - in general doesn't offer any benefits as we don't allow nested patch blocks (IF is always 1)
707	*/
708	case OP_PUSHF:
709	case OP_POPF:
710	break;
711
712	case OP_CLI:
713	{
714	uint32_t cbInstr = 0;
715	uint32_t opsize = pCpu->opsize;
716
717	PATMR3AddHint(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
718
719	/* Make sure the instructions that follow the cli have not been encountered before. */
720	while (true)
721	{
722	DISCPUSTATE cpu;
723	uint8_t *pCurInstrHC = 0;
724	bool disret;
725
726	if (cbInstr + opsize >= SIZEOF_NEARJUMP32)
727	break;
728
729	if (csamIsCodeScanned(pVM, pCurInstrGC + opsize, &pPage) == true)
730	{
731	/* We've scanned the next instruction(s) already. This means we've followed a branch that ended up there before -> dangerous!! */
732	PATMR3DetectConflict(pVM, pCurInstrGC, pCurInstrGC + opsize);
733	break;
734	}
735	pCurInstrGC += opsize;
736	cbInstr += opsize;
737
738	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
739	if (pCurInstrHC == NULL)
740	{
741	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
742	break;
743	}
744	Assert(VALID_PTR(pCurInstrHC));
745
746	cpu.mode = (pPage->fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
747	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
748	Assert(disret == true);
749	if (disret == false)
750	break;
751	}
752	break;
753	}
754
755	case OP_PUSH:
756	if (pCpu->pCurInstr->param1 != OP_PARM_REG_CS)
757	break;
758
759	/* no break */
760	case OP_STR:
761	case OP_LSL:
762	case OP_LAR:
763	case OP_SGDT:
764	case OP_SLDT:
765	case OP_SIDT:
766	case OP_SMSW:
767	case OP_VERW:
768	case OP_VERR:
769	case OP_CPUID:
770	case OP_IRET:
771	#ifdef DEBUG
772	switch(pCpu->pCurInstr->opcode)
773	{
774	case OP_STR:
775	Log(("Privileged instruction at %VGv: str!!\n", pCurInstrGC));
776	break;
777	case OP_LSL:
778	Log(("Privileged instruction at %VGv: lsl!!\n", pCurInstrGC));
779	break;
780	case OP_LAR:
781	Log(("Privileged instruction at %VGv: lar!!\n", pCurInstrGC));
782	break;
783	case OP_SGDT:
784	Log(("Privileged instruction at %VGv: sgdt!!\n", pCurInstrGC));
785	break;
786	case OP_SLDT:
787	Log(("Privileged instruction at %VGv: sldt!!\n", pCurInstrGC));
788	break;
789	case OP_SIDT:
790	Log(("Privileged instruction at %VGv: sidt!!\n", pCurInstrGC));
791	break;
792	case OP_SMSW:
793	Log(("Privileged instruction at %VGv: smsw!!\n", pCurInstrGC));
794	break;
795	case OP_VERW:
796	Log(("Privileged instruction at %VGv: verw!!\n", pCurInstrGC));
797	break;
798	case OP_VERR:
799	Log(("Privileged instruction at %VGv: verr!!\n", pCurInstrGC));
800	break;
801	case OP_CPUID:
802	Log(("Privileged instruction at %VGv: cpuid!!\n", pCurInstrGC));
803	break;
804	case OP_PUSH:
805	Log(("Privileged instruction at %VGv: push cs!!\n", pCurInstrGC));
806	break;
807	case OP_IRET:
808	Log(("Privileged instruction at %VGv: iret!!\n", pCurInstrGC));
809	break;
810	}
811	#endif
812
813	if (PATMR3HasBeenPatched(pVM, pCurInstrGC) == false)
814	{
815	rc = PATMR3InstallPatch(pVM, pCurInstrGC, (pPage->fCode32) ? PATMFL_CODE32 : 0);
816	if (VBOX_FAILURE(rc))
817	{
818	Log(("PATMR3InstallPatch failed with %d\n", rc));
819	return VWRN_CONTINUE_ANALYSIS;
820	}
821	}
822	if (pCpu->pCurInstr->opcode == OP_IRET)
823	return VINF_SUCCESS; /* Look no further in this branch. */
824
825	return VWRN_CONTINUE_ANALYSIS;
826
827	case OP_JMP:
828	case OP_CALL:
829	{
830	// return or jump/call through a jump table
831	if (OP_PARM_VTYPE(pCpu->pCurInstr->param1) != OP_PARM_J)
832	{
833	#ifdef DEBUG
834	switch(pCpu->pCurInstr->opcode)
835	{
836	case OP_JMP:
837	Log(("Control Flow instruction at %VGv: jmp!!\n", pCurInstrGC));
838	break;
839	case OP_CALL:
840	Log(("Control Flow instruction at %VGv: call!!\n", pCurInstrGC));
841	break;
842	}
843	#endif
844	return VWRN_CONTINUE_ANALYSIS;
845	}
846	return VWRN_CONTINUE_ANALYSIS;
847	}
848
849	}
850
851	return VWRN_CONTINUE_ANALYSIS;
852	}
853
854	#ifdef CSAM_ANALYSE_BEYOND_RET
855	/**
856	* Wrapper for csamAnalyseCodeStream for call instructions.
857	*
858	* @returns VBox status code.
859	* @param pVM The VM to operate on.
860	* @param pInstrGC Guest context pointer to privileged instruction
861	* @param pCurInstrGC Guest context pointer to the current instruction
862	* @param fCode32 16 or 32 bits code
863	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
864	* @param pUserData User pointer (callback specific)
865	*
866	*/
867	static int csamAnalyseCallCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
868	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
869	{
870	int rc;
871	CSAMCALLEXITREC CallExitRec;
872	PCSAMCALLEXITREC pOldCallRec;
873	PCSAMPAGE pPage = 0;
874	uint32_t i;
875
876	CallExitRec.cInstrAfterRet = 0;
877
878	pOldCallRec = pCacheRec->pCallExitRec;
879	pCacheRec->pCallExitRec = &CallExitRec;
880
881	rc = csamAnalyseCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
882
883	for (i=0;i<CallExitRec.cInstrAfterRet;i++)
884	{
885	PCSAMPAGE pPage = 0;
886
887	pCurInstrGC = CallExitRec.pInstrAfterRetGC[i];
888
889	/* Check if we've previously encountered the instruction after the ret. */
890	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
891	{
892	DISCPUSTATE cpu;
893	uint32_t opsize;
894	uint8_t *pCurInstrHC = 0;
895	bool disret;
896	#ifdef DEBUG
897	char szOutput[256];
898	#endif
899	if (pPage == NULL)
900	{
901	/* New address; let's take a look at it. */
902	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
903	if (pPage == NULL)
904	{
905	rc = VERR_NO_MEMORY;
906	goto done;
907	}
908	}
909
910	/**
911	* Some generic requirements for recognizing an adjacent function:
912	* - alignment fillers that consist of:
913	* - nop
914	* - lea genregX, [genregX (+ 0)]
915	* - push ebp after the filler (can extend this later); aligned at at least a 4 byte boundary
916	*/
917	for (int j=0;j<16;j++)
918	{
919	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
920	if (pCurInstrHC == NULL)
921	{
922	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
923	goto done;
924	}
925	Assert(VALID_PTR(pCurInstrHC));
926
927	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
928	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
929	#ifdef DEBUG
930	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
931	if (disret == true) Log(("CSAM Call Analysis: %s", szOutput));
932	#else
933	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
934	#endif
935	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
936	if (disret == false)
937	{
938	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
939	goto done;
940	}
941
942	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
943
944	GCPTRTYPE(uint8_t *) addr = 0;
945	PCSAMPAGE pJmpPage = NULL;
946
947	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
948	{
949	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
950	{
951	/// @todo fault in the page
952	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
953	goto done;
954	}
955	//all is fine, let's continue
956	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
957	}
958
959	switch (cpu.pCurInstr->opcode)
960	{
961	case OP_NOP:
962	case OP_INT3:
963	break; /* acceptable */
964
965	case OP_LEA:
966	/* Must be similar to:
967	*
968	* lea esi, [esi]
969	* lea esi, [esi+0]
970	* Any register is allowed as long as source and destination are identical.
971	*/
972	if ( cpu.param1.flags != USE_REG_GEN32
973	\|\| ( cpu.param2.flags != USE_REG_GEN32
974	&& ( !(cpu.param2.flags & USE_REG_GEN32)
975	\|\| !(cpu.param2.flags & (USE_DISPLACEMENT8\|USE_DISPLACEMENT16\|USE_DISPLACEMENT32))
976	\|\| cpu.param2.parval != 0
977	)
978	)
979	\|\| cpu.param1.base.reg_gen32 != cpu.param2.base.reg_gen32
980	)
981	{
982	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
983	goto next_function;
984	}
985	break;
986
987	case OP_PUSH:
988	{
989	if ( (pCurInstrGC & 0x3) != 0
990	\|\| cpu.param1.flags != USE_REG_GEN32
991	\|\| cpu.param1.base.reg_gen32 != USE_REG_EBP
992	)
993	{
994	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
995	goto next_function;
996	}
997
998	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
999	{
1000	CSAMCALLEXITREC CallExitRec2;
1001	CallExitRec2.cInstrAfterRet = 0;
1002
1003	pCacheRec->pCallExitRec = &CallExitRec2;
1004
1005	/* Analyse the function. */
1006	Log(("Found new function at %VGv\n", pCurInstrGC));
1007	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1008	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1009	}
1010	goto next_function;
1011	}
1012
1013	case OP_SUB:
1014	{
1015	if ( (pCurInstrGC & 0x3) != 0
1016	\|\| cpu.param1.flags != USE_REG_GEN32
1017	\|\| cpu.param1.base.reg_gen32 != USE_REG_ESP
1018	)
1019	{
1020	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1021	goto next_function;
1022	}
1023
1024	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1025	{
1026	CSAMCALLEXITREC CallExitRec2;
1027	CallExitRec2.cInstrAfterRet = 0;
1028
1029	pCacheRec->pCallExitRec = &CallExitRec2;
1030
1031	/* Analyse the function. */
1032	Log(("Found new function at %VGv\n", pCurInstrGC));
1033	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunction);
1034	csamAnalyseCallCodeStream(pVM, pInstrGC, pCurInstrGC, fCode32, pfnCSAMR3Analyse, pUserData, pCacheRec);
1035	}
1036	goto next_function;
1037	}
1038
1039	default:
1040	STAM_COUNTER_INC(&pVM->csam.s.StatScanNextFunctionFailed);
1041	goto next_function;
1042	}
1043	/* Mark it as scanned. */
1044	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1045	pCurInstrGC += opsize;
1046	} /* for at most 16 instructions */
1047	next_function:
1048	; /* MSVC complains otherwise */
1049	}
1050	}
1051	done:
1052	pCacheRec->pCallExitRec = pOldCallRec;
1053	return rc;
1054	}
1055	#else
1056	#define csamAnalyseCallCodeStream csamAnalyseCodeStream
1057	#endif
1058
1059	/**
1060	* Disassembles the code stream until the callback function detects a failure or decides everything is acceptable
1061	*
1062	* @returns VBox status code.
1063	* @param pVM The VM to operate on.
1064	* @param pInstrGC Guest context pointer to privileged instruction
1065	* @param pCurInstrGC Guest context pointer to the current instruction
1066	* @param fCode32 16 or 32 bits code
1067	* @param pfnCSAMR3Analyse Callback for testing the disassembled instruction
1068	* @param pUserData User pointer (callback specific)
1069	*
1070	*/
1071	static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t ) pInstrGC, GCPTRTYPE(uint8_t ) pCurInstrGC, bool fCode32,
1072	PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec)
1073	{
1074	DISCPUSTATE cpu;
1075	PCSAMPAGE pPage = (PCSAMPAGE)pUserData;
1076	int rc = VWRN_CONTINUE_ANALYSIS;
1077	uint32_t opsize;
1078	HCPTRTYPE(uint8_t *) pCurInstrHC = 0;
1079	bool disret;
1080
1081	#ifdef DEBUG
1082	char szOutput[256];
1083	#endif
1084
1085	LogFlow(("csamAnalyseCodeStream: code at %VGv depth=%d\n", pCurInstrGC, pCacheRec->depth));
1086
1087	pVM->csam.s.fScanningStarted = true;
1088
1089	pCacheRec->depth++;
1090	/*
1091	* Limit the call depth. (rather arbitrary upper limit; too low and we won't detect certain
1092	* cpuid instructions in Linux kernels; too high and we waste too much time scanning code)
1093	* (512 is necessary to detect cpuid instructions in Red Hat EL4; see defect 1355)
1094	* @note we are using a lot of stack here. couple of 100k when we go to the full depth (!)
1095	*/
1096	if (pCacheRec->depth > 512)
1097	{
1098	LogFlow(("CSAM: maximum calldepth reached for %VGv\n", pCurInstrGC));
1099	pCacheRec->depth--;
1100	return VINF_SUCCESS; //let's not go on forever
1101	}
1102
1103	Assert(!PATMIsPatchGCAddr(pVM, pCurInstrGC));
1104	csamR3CheckPageRecord(pVM, pCurInstrGC);
1105
1106	while(rc == VWRN_CONTINUE_ANALYSIS)
1107	{
1108	if (csamIsCodeScanned(pVM, pCurInstrGC, &pPage) == false)
1109	{
1110	if (pPage == NULL)
1111	{
1112	/* New address; let's take a look at it. */
1113	pPage = csamCreatePageRecord(pVM, pCurInstrGC, CSAM_TAG_CSAM, fCode32);
1114	if (pPage == NULL)
1115	{
1116	rc = VERR_NO_MEMORY;
1117	goto done;
1118	}
1119	}
1120	}
1121	else
1122	{
1123	LogFlow(("Code at %VGv has been scanned before\n", pCurInstrGC));
1124	rc = VINF_SUCCESS;
1125	goto done;
1126	}
1127
1128	pCurInstrHC = (uint8_t *)CSAMGCVirtToHCVirt(pVM, pCacheRec, pCurInstrGC);
1129	if (pCurInstrHC == NULL)
1130	{
1131	Log(("CSAMGCVirtToHCVirt failed for %VGv\n", pCurInstrGC));
1132	rc = VERR_PATCHING_REFUSED;
1133	goto done;
1134	}
1135	Assert(VALID_PTR(pCurInstrHC));
1136
1137	cpu.mode = (fCode32) ? CPUMODE_32BIT : CPUMODE_16BIT;
1138	STAM_PROFILE_START(&pVM->csam.s.StatTimeDisasm, a);
1139	#ifdef DEBUG
1140	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, szOutput);
1141	if (disret == true) Log(("CSAM Analysis: %s", szOutput));
1142	#else
1143	disret = CSAMR3DISInstr(pVM, &cpu, pCurInstrGC, pCurInstrHC, &opsize, NULL);
1144	#endif
1145	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeDisasm, a);
1146	if (disret == false)
1147	{
1148	Log(("Disassembly failed at %VGv (probably page not present) -> return to caller\n", pCurInstrGC));
1149	rc = VINF_SUCCESS;
1150	goto done;
1151	}
1152
1153	STAM_COUNTER_ADD(&pVM->csam.s.StatNrBytesRead, opsize);
1154
1155	csamMarkCode(pVM, pPage, pCurInstrGC, opsize, true);
1156
1157	GCPTRTYPE(uint8_t *) addr = 0;
1158	PCSAMPAGE pJmpPage = NULL;
1159
1160	if (PAGE_ADDRESS(pCurInstrGC) != PAGE_ADDRESS(pCurInstrGC + opsize - 1))
1161	{
1162	if (!PGMGstIsPagePresent(pVM, pCurInstrGC + opsize - 1))
1163	{
1164	/// @todo fault in the page
1165	Log(("Page for current instruction %VGv is not present!!\n", pCurInstrGC));
1166	rc = VWRN_CONTINUE_ANALYSIS;
1167	goto next_please;
1168	}
1169	//all is fine, let's continue
1170	csamR3CheckPageRecord(pVM, pCurInstrGC + opsize - 1);
1171	}
1172	/*
1173	* If it's harmless, then don't bother checking it (the disasm tables had better be accurate!)
1174	*/
1175	if ((cpu.pCurInstr->optype & ~OPTYPE_RRM_MASK) == OPTYPE_HARMLESS)
1176	{
1177	AssertMsg(pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage) == VWRN_CONTINUE_ANALYSIS, ("Instruction incorrectly marked harmless?!?!?\n"));
1178	rc = VWRN_CONTINUE_ANALYSIS;
1179	goto next_please;
1180	}
1181
1182	#ifdef CSAM_ANALYSE_BEYOND_RET
1183	/* Remember the address of the instruction following the ret in case the parent instruction was a call. */
1184	if ( pCacheRec->pCallExitRec
1185	&& cpu.pCurInstr->opcode == OP_RETN
1186	&& pCacheRec->pCallExitRec->cInstrAfterRet < CSAM_MAX_CALLEXIT_RET)
1187	{
1188	pCacheRec->pCallExitRec->pInstrAfterRetGC[pCacheRec->pCallExitRec->cInstrAfterRet] = pCurInstrGC + opsize;
1189	pCacheRec->pCallExitRec->cInstrAfterRet++;
1190	}
1191	#endif
1192
1193	rc = pfnCSAMR3Analyse(pVM, &cpu, pInstrGC, pCurInstrGC, pCacheRec, (void *)pPage);
1194	if (rc == VINF_SUCCESS)
1195	goto done;
1196
1197	// For our first attempt, we'll handle only simple relative jumps and calls (immediate offset coded in instruction)
1198	if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1199	{
1200	addr = CSAMResolveBranch(&cpu, pCurInstrGC);
1201	if (addr == 0)
1202	{
1203	Log(("We don't support far jumps here!! (%08X)\n", cpu.param1.flags));
1204	rc = VINF_SUCCESS;
1205	break;
1206	}
1207	Assert(!PATMIsPatchGCAddr(pVM, addr));
1208
1209	/* If the target address lies in a patch generated jump, then special action needs to be taken. */
1210	PATMR3DetectConflict(pVM, pCurInstrGC, addr);
1211
1212	/* Same page? */
1213	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pCurInstrGC ))
1214	{
1215	if (!PGMGstIsPagePresent(pVM, addr))
1216	{
1217	Log(("Page for current instruction %VGv is not present!!\n", addr));
1218	rc = VWRN_CONTINUE_ANALYSIS;
1219	goto next_please;
1220	}
1221
1222	/* All is fine, let's continue. */
1223	csamR3CheckPageRecord(pVM, addr);
1224	}
1225
1226	pJmpPage = NULL;
1227	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1228	{
1229	if (pJmpPage == NULL)
1230	{
1231	/* New branch target; let's take a look at it. */
1232	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1233	if (pJmpPage == NULL)
1234	{
1235	rc = VERR_NO_MEMORY;
1236	goto done;
1237	}
1238	Assert(pPage);
1239	}
1240	if (cpu.pCurInstr->opcode == OP_CALL)
1241	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1242	else
1243	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1244
1245	if (rc != VINF_SUCCESS) {
1246	goto done;
1247	}
1248	}
1249	if (cpu.pCurInstr->opcode == OP_JMP)
1250	{//unconditional jump; return to caller
1251	rc = VINF_SUCCESS;
1252	goto done;
1253	}
1254
1255	rc = VWRN_CONTINUE_ANALYSIS;
1256	} //if ((cpu.pCurInstr->optype & OPTYPE_CONTROLFLOW) && (OP_PARM_VTYPE(cpu.pCurInstr->param1) == OP_PARM_J))
1257	#ifdef CSAM_SCAN_JUMP_TABLE
1258	else
1259	if ( cpu.pCurInstr->opcode == OP_JMP
1260	&& (cpu.param1.flags & (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)) == (USE_DISPLACEMENT32\|USE_INDEX\|USE_SCALE)
1261	)
1262	{
1263	RTGCPTR pJumpTableGC = (RTGCPTR)cpu.param1.disp32;
1264	uint8_t *pJumpTableHC;
1265	int rc2;
1266
1267	Log(("Jump through jump table\n"));
1268
1269	rc2 = PGMPhysGCPtr2HCPtr(pVM, pJumpTableGC, (PRTHCPTR)&pJumpTableHC);
1270	if (rc2 == VINF_SUCCESS)
1271	{
1272	for (uint32_t i=0;i<2;i++)
1273	{
1274	uint64_t fFlags;
1275
1276	addr = pJumpTableGC + cpu.param1.scale * i;
1277	/* Same page? */
1278	if (PAGE_ADDRESS(addr) != PAGE_ADDRESS(pJumpTableGC))
1279	break;
1280
1281	addr = (RTGCPTR )(pJumpTableHC + cpu.param1.scale * i);
1282
1283	rc2 = PGMGstGetPage(pVM, addr, &fFlags, NULL);
1284	if ( rc2 != VINF_SUCCESS
1285	\|\| (fFlags & X86_PTE_US)
1286	\|\| !(fFlags & X86_PTE_P)
1287	)
1288	break;
1289
1290	Log(("Jump to %VGv\n", addr));
1291
1292	pJmpPage = NULL;
1293	if (csamIsCodeScanned(pVM, addr, &pJmpPage) == false)
1294	{
1295	if (pJmpPage == NULL)
1296	{
1297	/* New branch target; let's take a look at it. */
1298	pJmpPage = csamCreatePageRecord(pVM, addr, CSAM_TAG_CSAM, fCode32);
1299	if (pJmpPage == NULL)
1300	{
1301	rc = VERR_NO_MEMORY;
1302	goto done;
1303	}
1304	Assert(pPage);
1305	}
1306	rc = csamAnalyseCodeStream(pVM, pInstrGC, addr, fCode32, pfnCSAMR3Analyse, (void *)pJmpPage, pCacheRec);
1307	if (rc != VINF_SUCCESS) {
1308	goto done;
1309	}
1310	}
1311	}
1312	}
1313	}
1314	#endif
1315	if (rc != VWRN_CONTINUE_ANALYSIS) {
1316	break; //done!
1317	}
1318	next_please:
1319	if (cpu.pCurInstr->opcode == OP_JMP)
1320	{
1321	rc = VINF_SUCCESS;
1322	goto done;
1323	}
1324	pCurInstrGC += opsize;
1325	}
1326	done:
1327	pCacheRec->depth--;
1328	return rc;
1329	}
1330
1331
1332	/**
1333	* Calculates the 64 bits hash value for the current page
1334	*
1335	* @returns hash value
1336	* @param pVM The VM to operate on.
1337	* @param pInstr Page address
1338	*/
1339	uint64_t csamR3CalcPageHash(PVM pVM, RTGCPTR pInstr)
1340	{
1341	uint64_t hash = 0;
1342	uint32_t val[5];
1343	int rc;
1344
1345	Assert((pInstr & PAGE_OFFSET_MASK) == 0);
1346
1347	rc = PGMPhysReadGCPtr(pVM, &val[0], pInstr, sizeof(val[0]));
1348	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1349	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1350	{
1351	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1352	return ~0ULL;
1353	}
1354
1355	rc = PGMPhysReadGCPtr(pVM, &val[1], pInstr+1024, sizeof(val[0]));
1356	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1357	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1358	{
1359	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1360	return ~0ULL;
1361	}
1362
1363	rc = PGMPhysReadGCPtr(pVM, &val[2], pInstr+2048, sizeof(val[0]));
1364	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1365	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1366	{
1367	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1368	return ~0ULL;
1369	}
1370
1371	rc = PGMPhysReadGCPtr(pVM, &val[3], pInstr+3072, sizeof(val[0]));
1372	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1373	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1374	{
1375	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1376	return ~0ULL;
1377	}
1378
1379	rc = PGMPhysReadGCPtr(pVM, &val[4], pInstr+4092, sizeof(val[0]));
1380	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1381	if (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1382	{
1383	Log(("csamR3CalcPageHash: page %VGv not present!!\n", pInstr));
1384	return ~0ULL;
1385	}
1386
1387	// don't want to get division by zero traps
1388	val[2] \|= 1;
1389	val[4] \|= 1;
1390
1391	hash = (uint64_t)val[0] * (uint64_t)val[1] / (uint64_t)val[2] + (val[3]%val[4]);
1392	return (hash == ~0ULL) ? hash - 1 : hash;
1393	}
1394
1395
1396	/**
1397	* Notify CSAM of a page flush
1398	*
1399	* @returns VBox status code
1400	* @param pVM The VM to operate on.
1401	* @param addr GC address of the page to flush
1402	* @param fRemovePage Page removal flag
1403	*/
1404	static int csamFlushPage(PVM pVM, RTGCPTR addr, bool fRemovePage)
1405	{
1406	PCSAMPAGEREC pPageRec;
1407	int rc;
1408	RTGCPHYS GCPhys = 0;
1409	uint64_t fFlags = 0;
1410
1411	if (!CSAMIsEnabled(pVM))
1412	return VINF_SUCCESS;
1413
1414	STAM_PROFILE_START(&pVM->csam.s.StatTimeFlushPage, a);
1415
1416	addr = addr & PAGE_BASE_GC_MASK;
1417
1418	/*
1419	* Note: searching for the page in our tree first is more expensive (skipped flushes are two orders of magnitude more common)
1420	*/
1421	if (pVM->csam.s.pPageTree == NULL)
1422	{
1423	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1424	return VWRN_CSAM_PAGE_NOT_FOUND;
1425	}
1426
1427	rc = PGMGstGetPage(pVM, addr, &fFlags, &GCPhys);
1428	/* Returned at a very early stage (no paging yet presumably). */
1429	if (rc == VERR_NOT_SUPPORTED)
1430	{
1431	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1432	return rc;
1433	}
1434
1435	if (VBOX_SUCCESS(rc))
1436	{
1437	if ( (fFlags & X86_PTE_US)
1438	\|\| rc == VERR_PGM_PHYS_PAGE_RESERVED
1439	)
1440	{
1441	/* User page -> not relevant for us. */
1442	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1443	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1444	return VINF_SUCCESS;
1445	}
1446	}
1447	else
1448	if (rc != VERR_PAGE_NOT_PRESENT && rc != VERR_PAGE_TABLE_NOT_PRESENT)
1449	AssertMsgFailed(("PGMR3GetPage %VGv failed with %Vrc\n", addr, rc));
1450
1451	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)addr);
1452	if (pPageRec)
1453	{
1454	if ( GCPhys == pPageRec->page.GCPhys
1455	&& (fFlags & X86_PTE_P))
1456	{
1457	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushesSkipped, 1);
1458	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1459	return VINF_SUCCESS;
1460	}
1461
1462	Log(("CSAMR3FlushPage: page %VGv has changed -> FLUSH (rc=%Vrc) (Phys: %VGp vs %VGp)\n", addr, rc, GCPhys, pPageRec->page.GCPhys));
1463
1464	STAM_COUNTER_ADD(&pVM->csam.s.StatNrFlushes, 1);
1465
1466	if (fRemovePage)
1467	csamRemovePageRecord(pVM, addr);
1468	else
1469	{
1470	CSAMMarkPage(pVM, addr, false);
1471	pPageRec->page.GCPhys = 0;
1472	pPageRec->page.fFlags = 0;
1473	rc = PGMGstGetPage(pVM, addr, &pPageRec->page.fFlags, &pPageRec->page.GCPhys);
1474	if (rc == VINF_SUCCESS)
1475	pPageRec->page.u64Hash = csamR3CalcPageHash(pVM, addr);
1476
1477	if (pPageRec->page.pBitmap == NULL)
1478	{
1479	pPageRec->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, CSAM_PAGE_BITMAP_SIZE);
1480	Assert(pPageRec->page.pBitmap);
1481	if (pPageRec->page.pBitmap == NULL)
1482	return VERR_NO_MEMORY;
1483	}
1484	else
1485	memset(pPageRec->page.pBitmap, 0, CSAM_PAGE_BITMAP_SIZE);
1486	}
1487
1488
1489	/*
1490	* Inform patch manager about the flush; no need to repeat the above check twice.
1491	*/
1492	PATMR3FlushPage(pVM, addr);
1493
1494	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1495	return VINF_SUCCESS;
1496	}
1497	else
1498	{
1499	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeFlushPage, a);
1500	return VWRN_CSAM_PAGE_NOT_FOUND;
1501	}
1502	}
1503
1504	/**
1505	* Notify CSAM of a page flush
1506	*
1507	* @returns VBox status code
1508	* @param pVM The VM to operate on.
1509	* @param addr GC address of the page to flush
1510	*/
1511	CSAMR3DECL(int) CSAMR3FlushPage(PVM pVM, RTGCPTR addr)
1512	{
1513	return csamFlushPage(pVM, addr, true /* remove page record */);
1514	}
1515
1516	/**
1517	* Remove a CSAM monitored page. Use with care!
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) CSAMR3RemovePage(PVM pVM, RTGCPTR addr)
1524	{
1525	PCSAMPAGEREC pPageRec;
1526	int rc;
1527
1528	addr = addr & PAGE_BASE_GC_MASK;
1529
1530	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)addr);
1531	if (pPageRec)
1532	{
1533	rc = csamRemovePageRecord(pVM, addr);
1534	if (VBOX_SUCCESS(rc))
1535	PATMR3FlushPage(pVM, addr);
1536	return VINF_SUCCESS;
1537	}
1538	return VWRN_CSAM_PAGE_NOT_FOUND;
1539	}
1540
1541	/**
1542	* Check a page record in case a page has been changed
1543	*
1544	* @returns VBox status code. (trap handled or not)
1545	* @param pVM The VM to operate on.
1546	* @param pInstrGC GC instruction pointer
1547	*/
1548	int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstrGC)
1549	{
1550	PCSAMPAGEREC pPageRec;
1551	uint64_t u64hash;
1552
1553	pInstrGC = pInstrGC & PAGE_BASE_GC_MASK;
1554
1555	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstrGC);
1556	if (pPageRec)
1557	{
1558	u64hash = csamR3CalcPageHash(pVM, pInstrGC);
1559	if (u64hash != pPageRec->page.u64Hash)
1560	csamFlushPage(pVM, pInstrGC, false /* don't remove page record */);
1561	}
1562	else
1563	return VWRN_CSAM_PAGE_NOT_FOUND;
1564
1565	return VINF_SUCCESS;
1566	}
1567
1568	/**
1569	* Returns monitor description based on CSAM tag
1570	*
1571	* @return description string
1572	* @param enmTag Owner tag
1573	*/
1574	const char *csamGetMonitorDescription(CSAMTAG enmTag)
1575	{
1576	if (enmTag == CSAM_TAG_PATM)
1577	return "CSAM-PATM self-modifying code monitor handler";
1578	else
1579	if (enmTag == CSAM_TAG_REM)
1580	return "CSAM-REM self-modifying code monitor handler";
1581	Assert(enmTag == CSAM_TAG_CSAM);
1582	return "CSAM self-modifying code monitor handler";
1583	}
1584
1585	/**
1586	* Adds page record to our lookup tree
1587	*
1588	* @returns CSAMPAGE ptr or NULL if failure
1589	* @param pVM The VM to operate on.
1590	* @param GCPtr Page address
1591	* @param enmTag Owner tag
1592	* @param fCode32 16 or 32 bits code
1593	* @param fMonitorInvalidation Monitor page invalidation flag
1594	*/
1595	static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation)
1596	{
1597	PCSAMPAGEREC pPage;
1598	int rc;
1599	bool ret;
1600
1601	Log(("New page record for %VGv\n", GCPtr & PAGE_BASE_GC_MASK));
1602
1603	pPage = (PCSAMPAGEREC)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, sizeof(CSAMPAGEREC));
1604	if (pPage == NULL)
1605	{
1606	AssertMsgFailed(("csamCreatePageRecord: Out of memory!!!!\n"));
1607	return NULL;
1608	}
1609	/* Round down to page boundary. */
1610	GCPtr = (GCPtr & PAGE_BASE_GC_MASK);
1611	pPage->Core.Key = (AVLPVKEY)GCPtr;
1612	pPage->page.pPageGC = GCPtr;
1613	pPage->page.fCode32 = fCode32;
1614	pPage->page.fMonitorInvalidation = fMonitorInvalidation;
1615	pPage->page.enmTag = enmTag;
1616	pPage->page.fMonitorActive = false;
1617	pPage->page.pBitmap = (uint8_t *)MMR3HeapAllocZ(pVM, MM_TAG_CSAM_PATCH, PAGE_SIZE/sizeof(uint8_t));
1618	rc = PGMGstGetPage(pVM, GCPtr, &pPage->page.fFlags, &pPage->page.GCPhys);
1619	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1620
1621	pPage->page.u64Hash = csamR3CalcPageHash(pVM, GCPtr);
1622	ret = RTAvlPVInsert(&pVM->csam.s.pPageTree, &pPage->Core);
1623	Assert(ret);
1624
1625	#ifdef CSAM_MONITOR_CODE_PAGES
1626	AssertRelease(!fInCSAMCodePageInvalidate);
1627
1628	switch (enmTag)
1629	{
1630	case CSAM_TAG_PATM:
1631	case CSAM_TAG_REM:
1632	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1633	case CSAM_TAG_CSAM:
1634	#endif
1635	{
1636	int rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtr, GCPtr + (PAGE_SIZE - 1) /* inclusive! */,
1637	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1638	csamGetMonitorDescription(enmTag));
1639	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", GCPtr, rc));
1640	if (VBOX_FAILURE(rc))
1641	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", GCPtr, rc));
1642
1643	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1644
1645	/* Prefetch it in case it's not there yet. */
1646	rc = PGMPrefetchPage(pVM, GCPtr);
1647	AssertRC(rc);
1648
1649	rc = PGMShwModifyPage(pVM, GCPtr, 1, 0, ~(uint64_t)X86_PTE_RW);
1650	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1651
1652	pPage->page.fMonitorActive = true;
1653	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1654	break;
1655	}
1656	default:
1657	break; /* to shut up GCC */
1658	}
1659
1660	Log(("csamCreatePageRecord %VGv HCPhys=%VGp\n", GCPtr, pPage->page.GCPhys));
1661
1662	#ifdef VBOX_WITH_STATISTICS
1663	switch (enmTag)
1664	{
1665	case CSAM_TAG_CSAM:
1666	STAM_COUNTER_INC(&pVM->csam.s.StatPageCSAM);
1667	break;
1668	case CSAM_TAG_PATM:
1669	STAM_COUNTER_INC(&pVM->csam.s.StatPagePATM);
1670	break;
1671	case CSAM_TAG_REM:
1672	STAM_COUNTER_INC(&pVM->csam.s.StatPageREM);
1673	break;
1674	default:
1675	break; /* to shut up GCC */
1676	}
1677	#endif
1678
1679	#endif
1680
1681	STAM_COUNTER_INC(&pVM->csam.s.StatNrPages);
1682	if (fMonitorInvalidation)
1683	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1684
1685	return &pPage->page;
1686	}
1687
1688	/**
1689	* Monitors a code page (if not already monitored)
1690	*
1691	* @returns VBox status code
1692	* @param pVM The VM to operate on.
1693	* @param pPageAddrGC The page to monitor
1694	* @param enmTag Monitor tag
1695	*/
1696	CSAMR3DECL(int) CSAMR3MonitorPage(PVM pVM, RTGCPTR pPageAddrGC, CSAMTAG enmTag)
1697	{
1698	PCSAMPAGEREC pPageRec = NULL;
1699	int rc;
1700	bool fMonitorInvalidation;
1701
1702	/* Dirty pages must be handled before calling this function!. */
1703	Assert(!pVM->csam.s.cDirtyPages);
1704
1705	if (pVM->csam.s.fScanningStarted == false)
1706	return VINF_SUCCESS; /* too early */
1707
1708	pPageAddrGC &= PAGE_BASE_GC_MASK;
1709
1710	Log(("CSAMR3MonitorPage %VGv %d\n", pPageAddrGC, enmTag));
1711
1712	/** @todo implicit assumption */
1713	fMonitorInvalidation = (enmTag == CSAM_TAG_PATM);
1714
1715	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1716	if (pPageRec == NULL)
1717	{
1718	uint64_t fFlags;
1719
1720	rc = PGMGstGetPage(pVM, pPageAddrGC, &fFlags, NULL);
1721	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
1722	if ( rc == VINF_SUCCESS
1723	&& (fFlags & X86_PTE_US))
1724	{
1725	/* We don't care about user pages. */
1726	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
1727	return VINF_SUCCESS;
1728	}
1729
1730	csamCreatePageRecord(pVM, pPageAddrGC, enmTag, true /* 32 bits code */, fMonitorInvalidation);
1731
1732	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pPageAddrGC);
1733	Assert(pPageRec);
1734	}
1735	/** @todo reference count */
1736
1737	#ifdef CSAM_MONITOR_CSAM_CODE_PAGES
1738	Assert(pPageRec->page.fMonitorActive);
1739	#endif
1740
1741	#ifdef CSAM_MONITOR_CODE_PAGES
1742	if (!pPageRec->page.fMonitorActive)
1743	{
1744	Log(("CSAMR3MonitorPage: activate monitoring for %VGv\n", pPageAddrGC));
1745
1746	rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, pPageAddrGC, pPageAddrGC + (PAGE_SIZE - 1) /* inclusive! */,
1747	(fMonitorInvalidation) ? CSAMCodePageInvalidate : 0, CSAMCodePageWriteHandler, "CSAMGCCodePageWriteHandler", 0,
1748	csamGetMonitorDescription(enmTag));
1749	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT, ("PGMR3HandlerVirtualRegisterEx %VGv failed with %Vrc\n", pPageAddrGC, rc));
1750	if (VBOX_FAILURE(rc))
1751	Log(("PGMR3HandlerVirtualRegisterEx for %VGv failed with %Vrc\n", pPageAddrGC, rc));
1752
1753	/* Could fail, because it's already monitored. Don't treat that condition as fatal. */
1754
1755	/* Prefetch it in case it's not there yet. */
1756	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1757	AssertRC(rc);
1758
1759	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1760	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1761
1762	STAM_COUNTER_INC(&pVM->csam.s.StatPageMonitor);
1763
1764	pPageRec->page.fMonitorActive = true;
1765	pPageRec->page.fMonitorInvalidation = fMonitorInvalidation;
1766	}
1767	else
1768	if ( !pPageRec->page.fMonitorInvalidation
1769	&& fMonitorInvalidation)
1770	{
1771	Assert(pPageRec->page.fMonitorActive);
1772	PGMHandlerVirtualChangeInvalidateCallback(pVM, pPageRec->page.pPageGC, CSAMCodePageInvalidate);
1773	pPageRec->page.fMonitorInvalidation = true;
1774	STAM_COUNTER_INC(&pVM->csam.s.StatNrPagesInv);
1775
1776	/* Prefetch it in case it's not there yet. */
1777	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1778	AssertRC(rc);
1779
1780	/* Make sure it's readonly. Page invalidation may have modified the attributes. */
1781	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1782	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1783	}
1784
1785	#if 0 /* def VBOX_STRICT -> very annoying) */
1786	if (pPageRec->page.fMonitorActive)
1787	{
1788	uint64_t fPageShw;
1789	RTHCPHYS GCPhys;
1790	rc = PGMShwGetPage(pVM, pPageAddrGC, &fPageShw, &GCPhys);
1791	// AssertMsg( (rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT)
1792	// \|\| !(fPageShw & X86_PTE_RW)
1793	// \|\| (pPageRec->page.GCPhys == 0), ("Shadow page flags for %VGv (%VHp) aren't readonly (%VX64)!!\n", pPageAddrGC, GCPhys, fPageShw));
1794	}
1795	#endif
1796
1797	if (pPageRec->page.GCPhys == 0)
1798	{
1799	/* Prefetch it in case it's not there yet. */
1800	rc = PGMPrefetchPage(pVM, pPageAddrGC);
1801	AssertRC(rc);
1802	/* The page was changed behind our back. It won't be made read-only until the next SyncCR3, so force it here. */
1803	rc = PGMShwModifyPage(pVM, pPageAddrGC, 1, 0, ~(uint64_t)X86_PTE_RW);
1804	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
1805	}
1806	#endif /* CSAM_MONITOR_CODE_PAGES */
1807	return VINF_SUCCESS;
1808	}
1809
1810	/**
1811	* Removes a page record from our lookup tree
1812	*
1813	* @returns VBox status code
1814	* @param pVM The VM to operate on.
1815	* @param GCPtr Page address
1816	*/
1817	static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr)
1818	{
1819	PCSAMPAGEREC pPageRec;
1820
1821	Log(("csamRemovePageRecord %VGv\n", GCPtr));
1822	pPageRec = (PCSAMPAGEREC)RTAvlPVRemove(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
1823
1824	if (pPageRec)
1825	{
1826	STAM_COUNTER_INC(&pVM->csam.s.StatNrRemovedPages);
1827
1828	#ifdef CSAM_MONITOR_CODE_PAGES
1829	if (pPageRec->page.fMonitorActive)
1830	{
1831	/* @todo -> this is expensive (cr3 reload)!!!
1832	* if this happens often, then reuse it instead!!!
1833	*/
1834	Assert(!fInCSAMCodePageInvalidate);
1835	STAM_COUNTER_DEC(&pVM->csam.s.StatPageMonitor);
1836	PGMHandlerVirtualDeregister(pVM, GCPtr);
1837	}
1838	if (pPageRec->page.enmTag == CSAM_TAG_PATM)
1839	{
1840	/* Make sure the recompiler flushes its cache as this page is no longer monitored. */
1841	STAM_COUNTER_INC(&pVM->csam.s.StatPageRemoveREMFlush);
1842	CPUMSetChangedFlags(pVM, CPUM_CHANGED_GLOBAL_TLB_FLUSH);
1843	}
1844	#endif
1845
1846	#ifdef VBOX_WITH_STATISTICS
1847	switch (pPageRec->page.enmTag)
1848	{
1849	case CSAM_TAG_CSAM:
1850	STAM_COUNTER_DEC(&pVM->csam.s.StatPageCSAM);
1851	break;
1852	case CSAM_TAG_PATM:
1853	STAM_COUNTER_DEC(&pVM->csam.s.StatPagePATM);
1854	break;
1855	case CSAM_TAG_REM:
1856	STAM_COUNTER_DEC(&pVM->csam.s.StatPageREM);
1857	break;
1858	default:
1859	break; /* to shut up GCC */
1860	}
1861	#endif
1862
1863	if (pPageRec->page.pBitmap) MMR3HeapFree(pPageRec->page.pBitmap);
1864	MMR3HeapFree(pPageRec);
1865	}
1866	else
1867	AssertFailed();
1868
1869	return VINF_SUCCESS;
1870	}
1871
1872	/**
1873	* Callback for delayed writes from non-EMT threads
1874	*
1875	* @param pVM VM Handle.
1876	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1877	* @param cbBuf How much it's reading/writing.
1878	*/
1879	static DECLCALLBACK(void) CSAMDelayedWriteHandler(PVM pVM, RTGCPTR GCPtr, size_t cbBuf)
1880	{
1881	int rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1882	AssertRC(rc);
1883	}
1884
1885	/**
1886	* #PF Handler callback for virtual access handler ranges.
1887	*
1888	* Important to realize that a physical page in a range can have aliases, and
1889	* for ALL and WRITE handlers these will also trigger.
1890	*
1891	* @returns VINF_SUCCESS if the handler have carried out the operation.
1892	* @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
1893	* @param pVM VM Handle.
1894	* @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
1895	* @param pvPtr The HC mapping of that address.
1896	* @param pvBuf What the guest is reading/writing.
1897	* @param cbBuf How much it's reading/writing.
1898	* @param enmAccessType The access type.
1899	* @param pvUser User argument.
1900	*/
1901	static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void pvPtr, void pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser)
1902	{
1903	int rc;
1904
1905	Assert(enmAccessType == PGMACCESSTYPE_WRITE);
1906	Log(("CSAMCodePageWriteHandler: write to %VGv size=%d\n", GCPtr, cbBuf));
1907
1908	if (VM_IS_EMT(pVM))
1909	{
1910	rc = PATMR3PatchWrite(pVM, GCPtr, cbBuf);
1911	}
1912	else
1913	{
1914	/* Queue the write instead otherwise we'll get concurrency issues. */
1915	/** @note in theory not correct to let it write the data first before disabling a patch!
1916	* (if it writes the same data as the patch jump and we replace it with obsolete opcodes)
1917	*/
1918	Log(("CSAMCodePageWriteHandler: delayed write!\n"));
1919	rc = VMR3ReqCallEx(pVM, NULL, 0, VMREQFLAGS_NO_WAIT \| VMREQFLAGS_VOID,
1920	(PFNRT)CSAMDelayedWriteHandler, 3, pVM, GCPtr, cbBuf);
1921	}
1922	AssertRC(rc);
1923
1924	return VINF_PGM_HANDLER_DO_DEFAULT;
1925	}
1926
1927	/**
1928	* #PF Handler callback for invalidation of virtual access handler ranges.
1929	*
1930	* @param pVM VM Handle.
1931	* @param GCPtr The virtual address the guest has changed.
1932	*/
1933	static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr)
1934	{
1935	fInCSAMCodePageInvalidate = true;
1936	LogFlow(("CSAMCodePageInvalidate %VGv\n", GCPtr));
1937	/** @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. */
1938	csamFlushPage(pVM, GCPtr, false /* don't remove page! */);
1939	fInCSAMCodePageInvalidate = false;
1940	return VINF_SUCCESS;
1941	}
1942
1943	/**
1944	* Check if the current instruction has already been checked before
1945	*
1946	* @returns VBox status code. (trap handled or not)
1947	* @param pVM The VM to operate on.
1948	* @param pInstr Instruction pointer
1949	* @param pPage CSAM patch structure pointer
1950	*/
1951	bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage)
1952	{
1953	PCSAMPAGEREC pPageRec;
1954	uint32_t offset;
1955
1956	STAM_PROFILE_START(&pVM->csam.s.StatTimeCheckAddr, a);
1957
1958	offset = pInstr & PAGE_OFFSET_MASK;
1959	pInstr = pInstr & PAGE_BASE_GC_MASK;
1960
1961	Assert(pPage);
1962
1963	if (pPage && (pPage)->pPageGC == pInstr)
1964	{
1965	if ((pPage)->pBitmap == NULL \|\| ASMBitTest((pPage)->pBitmap, offset))
1966	{
1967	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1968	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1969	return true;
1970	}
1971	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1972	return false;
1973	}
1974
1975	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)pInstr);
1976	if (pPageRec)
1977	{
1978	if (pPage) *pPage= &pPageRec->page;
1979	if (pPageRec->page.pBitmap == NULL \|\| ASMBitTest(pPageRec->page.pBitmap, offset))
1980	{
1981	STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesHC, 1);
1982	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1983	return true;
1984	}
1985	}
1986	else
1987	{
1988	if (pPage) *pPage = NULL;
1989	}
1990	STAM_PROFILE_STOP(&pVM->csam.s.StatTimeCheckAddr, a);
1991	return false;
1992	}
1993
1994	/**
1995	* Mark an instruction in a page as scanned/not scanned
1996	*
1997	* @param pVM The VM to operate on.
1998	* @param pPage Patch structure pointer
1999	* @param pInstr Instruction pointer
2000	* @param opsize Instruction size
2001	* @param fScanned Mark as scanned or not
2002	*/
2003	static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
2004	{
2005	LogFlow(("csamMarkCodeAsScanned %VGv opsize=%d\n", pInstr, opsize));
2006	CSAMMarkPage(pVM, pInstr, fScanned);
2007
2008	/** @todo should recreate empty bitmap if !fScanned */
2009	if (pPage->pBitmap == NULL)
2010	return;
2011
2012	if (fScanned)
2013	{
2014	// retn instructions can be scanned more than once
2015	if (ASMBitTest(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK) == 0)
2016	{
2017	pPage->uSize += opsize;
2018	STAM_COUNTER_ADD(&pVM->csam.s.StatNrInstr, 1);
2019	}
2020	if (pPage->uSize >= PAGE_SIZE)
2021	{
2022	Log(("Scanned full page (%VGv) -> free bitmap\n", pInstr & PAGE_BASE_GC_MASK));
2023	MMR3HeapFree(pPage->pBitmap);
2024	pPage->pBitmap = NULL;
2025	}
2026	else
2027	ASMBitSet(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2028	}
2029	else
2030	ASMBitClear(pPage->pBitmap, pInstr & PAGE_OFFSET_MASK);
2031	}
2032
2033	/**
2034	* Mark an instruction in a page as scanned/not scanned
2035	*
2036	* @returns VBox status code.
2037	* @param pVM The VM to operate on.
2038	* @param pInstr Instruction pointer
2039	* @param opsize Instruction size
2040	* @param fScanned Mark as scanned or not
2041	*/
2042	CSAMR3DECL(int) CSAMR3MarkCode(PVM pVM, RTGCPTR pInstr, uint32_t opsize, bool fScanned)
2043	{
2044	PCSAMPAGE pPage = 0;
2045
2046	Assert(!fScanned); /* other case not implemented. */
2047	Assert(!PATMIsPatchGCAddr(pVM, pInstr));
2048
2049	if (csamIsCodeScanned(pVM, pInstr, &pPage) == false)
2050	{
2051	Assert(fScanned == true); /* other case should not be possible */
2052	return VINF_SUCCESS;
2053	}
2054
2055	Log(("CSAMR3MarkCode: %VGv size=%d fScanned=%d\n", pInstr, opsize, fScanned));
2056	csamMarkCode(pVM, pPage, pInstr, opsize, fScanned);
2057	return VINF_SUCCESS;
2058	}
2059
2060
2061	/**
2062	* Scan and analyse code
2063	*
2064	* @returns VBox status code.
2065	* @param pVM The VM to operate on.
2066	* @param Sel selector
2067	* @param pHiddenSel The hidden selector register.
2068	* @param pInstrGC Instruction pointer
2069	*/
2070	CSAMR3DECL(int) CSAMR3CheckCodeEx(PVM pVM, RTSEL Sel, CPUMSELREGHID *pHiddenSel, RTGCPTR pInstrGC)
2071	{
2072	if (EMIsRawRing0Enabled(pVM) == false \|\| PATMIsPatchGCAddr(pVM, pInstrGC) == true)
2073	{
2074	// No use
2075	return VINF_SUCCESS;
2076	}
2077
2078	if (CSAMIsEnabled(pVM))
2079	{
2080	X86EFLAGS fakeflags;
2081
2082	/* we're not in v86 mode here */
2083	fakeflags.u32 = 0;
2084
2085	bool fCode32 = SELMIsSelector32Bit(pVM, fakeflags, Sel, pHiddenSel);
2086
2087	//assuming 32 bits code for now
2088	Assert(fCode32); NOREF(fCode32);
2089
2090	pInstrGC = SELMToFlat(pVM, fakeflags, Sel, pHiddenSel, pInstrGC);
2091
2092	return CSAMR3CheckCode(pVM, pInstrGC);
2093	}
2094	return VINF_SUCCESS;
2095	}
2096
2097	/**
2098	* Scan and analyse code
2099	*
2100	* @returns VBox status code.
2101	* @param pVM The VM to operate on.
2102	* @param pInstrGC Instruction pointer (0:32 virtual address)
2103	*/
2104	CSAMR3DECL(int) CSAMR3CheckCode(PVM pVM, RTGCPTR pInstrGC)
2105	{
2106	int rc;
2107	PCSAMPAGE pPage = NULL;
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	// Cache record for PATMGCVirtToHCVirt
2118	CSAMP2GLOOKUPREC cacheRec = {0};
2119
2120	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2121	rc = csamAnalyseCallCodeStream(pVM, pInstrGC, pInstrGC, true /* 32 bits code */, CSAMR3AnalyseCallback, pPage, &cacheRec);
2122	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2123	if (rc != VINF_SUCCESS)
2124	{
2125	Log(("csamAnalyseCodeStream failed with %d\n", rc));
2126	return rc;
2127	}
2128	}
2129	return VINF_SUCCESS;
2130	}
2131
2132	/**
2133	* Flush dirty code pages
2134	*
2135	* @returns VBox status code.
2136	* @param pVM The VM to operate on.
2137	*/
2138	static int csamR3FlushDirtyPages(PVM pVM)
2139	{
2140	STAM_PROFILE_START(&pVM->csam.s.StatFlushDirtyPages, a);
2141
2142	for (uint32_t i=0;i<pVM->csam.s.cDirtyPages;i++)
2143	{
2144	int rc;
2145	PCSAMPAGEREC pPageRec;
2146	RTGCPTR GCPtr = pVM->csam.s.pvDirtyBasePage[i];
2147
2148	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2149
2150	/* Notify the recompiler that this page has been changed. */
2151	REMR3NotifyCodePageChanged(pVM, GCPtr);
2152
2153	/* Enable write protection again. (use the fault address as it might be an alias) */
2154	rc = PGMShwModifyPage(pVM, pVM->csam.s.pvDirtyFaultPage[i], 1, 0, ~(uint64_t)X86_PTE_RW);
2155	Assert(rc == VINF_SUCCESS \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT);
2156
2157	Log(("CSAMR3FlushDirtyPages: flush %VGv (modifypage rc=%Vrc)\n", pVM->csam.s.pvDirtyBasePage[i], rc));
2158
2159	pPageRec = (PCSAMPAGEREC)RTAvlPVGet(&pVM->csam.s.pPageTree, (AVLPVKEY)GCPtr);
2160	if (pPageRec && pPageRec->page.enmTag == CSAM_TAG_REM)
2161	{
2162	uint64_t fFlags;
2163
2164	rc = PGMGstGetPage(pVM, GCPtr, &fFlags, NULL);
2165	AssertMsg(VBOX_SUCCESS(rc) \|\| rc == VERR_PAGE_NOT_PRESENT \|\| rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc = %Vrc\n", rc));
2166	if ( rc == VINF_SUCCESS
2167	&& (fFlags & X86_PTE_US))
2168	{
2169	/* We don't care about user pages. */
2170	csamRemovePageRecord(pVM, GCPtr);
2171	STAM_COUNTER_INC(&pVM->csam.s.StatNrUserPages);
2172	}
2173	}
2174	}
2175	pVM->csam.s.cDirtyPages = 0;
2176	STAM_PROFILE_STOP(&pVM->csam.s.StatFlushDirtyPages, a);
2177	return VINF_SUCCESS;
2178	}
2179
2180	/**
2181	* Flush potential new code pages
2182	*
2183	* @returns VBox status code.
2184	* @param pVM The VM to operate on.
2185	*/
2186	static int csamR3FlushCodePages(PVM pVM)
2187	{
2188	for (uint32_t i=0;i<pVM->csam.s.cPossibleCodePages;i++)
2189	{
2190	RTGCPTR GCPtr = pVM->csam.s.pvPossibleCodePage[i];
2191
2192	GCPtr = GCPtr & PAGE_BASE_GC_MASK;
2193
2194	Log(("csamR3FlushCodePages: %VGv\n", GCPtr));
2195	PGMShwSetPage(pVM, GCPtr, 1, 0);
2196	/* Resync the page to make sure instruction fetch will fault */
2197	CSAMMarkPage(pVM, GCPtr, false);
2198	}
2199	pVM->csam.s.cPossibleCodePages = 0;
2200	return VINF_SUCCESS;
2201	}
2202
2203	/**
2204	* Perform any pending actions
2205	*
2206	* @returns VBox status code.
2207	* @param pVM The VM to operate on.
2208	*/
2209	CSAMR3DECL(int) CSAMR3DoPendingAction(PVM pVM)
2210	{
2211	csamR3FlushDirtyPages(pVM);
2212	csamR3FlushCodePages(pVM);
2213
2214	VM_FF_CLEAR(pVM, VM_FF_CSAM_PENDING_ACTION);
2215	return VINF_SUCCESS;
2216	}
2217
2218	/**
2219	* Analyse interrupt and trap gates
2220	*
2221	* @returns VBox status code.
2222	* @param pVM The VM to operate on.
2223	* @param iGate Start gate
2224	* @param cGates Number of gates to check
2225	*/
2226	CSAMR3DECL(int) CSAMR3CheckGates(PVM pVM, uint32_t iGate, uint32_t cGates)
2227	{
2228	uint16_t cbIDT;
2229	RTGCPTR GCPtrIDT = CPUMGetGuestIDTR(pVM, &cbIDT);
2230	uint32_t iGateEnd;
2231	uint32_t maxGates;
2232	VBOXIDTE aIDT[256];
2233	PVBOXIDTE pGuestIdte;
2234	int rc;
2235
2236	if (EMIsRawRing0Enabled(pVM) == false)
2237	{
2238	/* Enabling interrupt gates only works when raw ring 0 is enabled. */
2239	//AssertFailed();
2240	return VINF_SUCCESS;
2241	}
2242
2243	/* We only check all gates once during a session */
2244	if ( !pVM->csam.s.fGatesChecked
2245	&& cGates != 256)
2246	return VINF_SUCCESS; /* too early */
2247
2248	/* We only check all gates once during a session */
2249	if ( pVM->csam.s.fGatesChecked
2250	&& cGates != 1)
2251	return VINF_SUCCESS; /* ignored */
2252
2253	Assert(cGates <= 256);
2254	if (!GCPtrIDT \|\| cGates > 256)
2255	return VERR_INVALID_PARAMETER;
2256
2257	if (cGates != 1)
2258	pVM->csam.s.fGatesChecked = true;
2259
2260	/* Determine valid upper boundary. */
2261	maxGates = (cbIDT+1) / sizeof(VBOXIDTE);
2262	Assert(iGate < maxGates);
2263	if (iGate > maxGates)
2264	return VERR_INVALID_PARAMETER;
2265
2266	if (iGate + cGates > maxGates)
2267	cGates = maxGates - iGate;
2268
2269	GCPtrIDT = GCPtrIDT + iGate * sizeof(VBOXIDTE);
2270	iGateEnd = iGate + cGates;
2271
2272	STAM_PROFILE_START(&pVM->csam.s.StatCheckGates, a);
2273
2274	/*
2275	* Get IDT entries.
2276	*/
2277	if (PAGE_ADDRESS(GCPtrIDT) == PAGE_ADDRESS(GCPtrIDT+cGates*sizeof(VBOXIDTE)))
2278	{
2279	/* Just convert the IDT address to a HC pointer. The whole IDT fits in one page. */
2280	rc = PGMPhysGCPtr2HCPtr(pVM, GCPtrIDT, (PRTHCPTR)&pGuestIdte);
2281	if (VBOX_FAILURE(rc))
2282	{
2283	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2284	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2285	return rc;
2286	}
2287	}
2288	else
2289	{
2290	/* Slow method when it crosses a page boundary. */
2291	rc = PGMPhysReadGCPtr(pVM, aIDT, GCPtrIDT, cGates*sizeof(VBOXIDTE));
2292	if (VBOX_FAILURE(rc))
2293	{
2294	AssertMsgRC(rc, ("Failed to read IDTE! rc=%Vrc\n", rc));
2295	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2296	return rc;
2297	}
2298	pGuestIdte = &aIDT[0];
2299	}
2300
2301	for (/iGate/; iGate<iGateEnd; iGate++, pGuestIdte++)
2302	{
2303	Assert(TRPMR3GetGuestTrapHandler(pVM, iGate) == TRPM_INVALID_HANDLER);
2304
2305	if ( pGuestIdte->Gen.u1Present
2306	&& (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32 \|\| pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_INT_32)
2307	&& (pGuestIdte->Gen.u2DPL == 3 \|\| pGuestIdte->Gen.u2DPL == 0)
2308	)
2309	{
2310	RTGCPTR pHandler;
2311	CSAMP2GLOOKUPREC cacheRec = {0}; /* Cache record for PATMGCVirtToHCVirt. */
2312	PCSAMPAGE pPage = NULL;
2313	X86EFLAGS fakeflags;
2314	SELMSELINFO selInfo;
2315
2316	/* we're not in v86 mode here */
2317	fakeflags.u32 = 0;
2318
2319	pHandler = (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow;
2320	pHandler = SELMToFlat(pVM, fakeflags, pGuestIdte->Gen.u16SegSel, 0, pHandler);
2321
2322	rc = SELMR3GetSelectorInfo(pVM, pGuestIdte->Gen.u16SegSel, &selInfo);
2323	if ( VBOX_FAILURE(rc)
2324	\|\| selInfo.GCPtrBase != 0
2325	\|\| selInfo.cbLimit != ~0U
2326	)
2327	{
2328	/* Refuse to patch a handler whose idt cs selector isn't wide open. */
2329	Log(("CSAMCheckGates: check gate %d failed due to rc %Vrc GCPtrBase=%VGv limit=%x\n", iGate, rc, selInfo.GCPtrBase, selInfo.cbLimit));
2330	continue;
2331	}
2332
2333
2334	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2335	{
2336	Log(("CSAMCheckGates: check trap gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2337	}
2338	else
2339	{
2340	Log(("CSAMCheckGates: check interrupt gate %d at %04X:%08X (flat %VGv)\n", iGate, pGuestIdte->Gen.u16SegSel, (pGuestIdte->Gen.u16OffsetHigh << 16) \| pGuestIdte->Gen.u16OffsetLow, pHandler));
2341	}
2342
2343	STAM_PROFILE_START(&pVM->csam.s.StatTime, a);
2344	rc = csamAnalyseCodeStream(pVM, pHandler, pHandler, true, CSAMR3AnalyseCallback, pPage, &cacheRec);
2345	STAM_PROFILE_STOP(&pVM->csam.s.StatTime, a);
2346	if (rc != VINF_SUCCESS)
2347	{
2348	Log(("CSAMCheckGates: csamAnalyseCodeStream failed with %d\n", rc));
2349	continue;
2350	}
2351	/* OpenBSD guest specific patch test. */
2352	if (iGate >= 0x20)
2353	{
2354	PCPUMCTX pCtx;
2355	DISCPUSTATE cpu;
2356	RTGCUINTPTR aOpenBsdPushCSOffset[3] = {0x03, /* OpenBSD 3.7 & 3.8 */
2357	0x2B, /* OpenBSD 4.0 installation ISO */
2358	0x2F}; /* OpenBSD 4.0 after install */
2359
2360	rc = CPUMQueryGuestCtxPtr(pVM, &pCtx);
2361	AssertRC(rc); /* can't fail */
2362
2363	for (unsigned i=0;i<ELEMENTS(aOpenBsdPushCSOffset);i++)
2364	{
2365	rc = CPUMR3DisasmInstrCPU(pVM, pCtx, pHandler - aOpenBsdPushCSOffset[i], &cpu, NULL);
2366	if ( rc == VINF_SUCCESS
2367	&& cpu.pCurInstr->opcode == OP_PUSH
2368	&& cpu.pCurInstr->param1 == OP_PARM_REG_CS)
2369	{
2370	rc = PATMR3InstallPatch(pVM, pHandler - aOpenBsdPushCSOffset[i], PATMFL_CODE32 \| PATMFL_GUEST_SPECIFIC);
2371	if (VBOX_SUCCESS(rc))
2372	Log(("Installed OpenBSD interrupt handler prefix instruction (push cs) patch\n"));
2373	}
2374	}
2375	}
2376
2377	/* Trap gates and certain interrupt gates. */
2378	uint32_t fPatchFlags = PATMFL_CODE32 \| PATMFL_IDTHANDLER;
2379
2380	if (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32)
2381	fPatchFlags \|= PATMFL_TRAPHANDLER;
2382	else
2383	fPatchFlags \|= PATMFL_INTHANDLER;
2384
2385	switch (iGate) {
2386	case 8:
2387	case 10:
2388	case 11:
2389	case 12:
2390	case 13:
2391	case 14:
2392	case 17:
2393	fPatchFlags \|= PATMFL_TRAPHANDLER_WITH_ERRORCODE;
2394	break;
2395	default:
2396	/* No error code. */
2397	break;
2398	}
2399
2400	Log(("Installing %s gate handler for 0x%X at %VGv\n", (pGuestIdte->Gen.u5Type2 == VBOX_IDTE_TYPE2_TRAP_32) ? "trap" : "intr", iGate, pHandler));
2401
2402	rc = PATMR3InstallPatch(pVM, pHandler, fPatchFlags);
2403	if (VBOX_SUCCESS(rc) \|\| rc == VERR_PATM_ALREADY_PATCHED)
2404	{
2405	Log(("Gate handler 0x%X is SAFE!\n", iGate));
2406
2407	RTGCPTR pNewHandlerGC = PATMR3QueryPatchGCPtr(pVM, pHandler);
2408	if (pNewHandlerGC)
2409	{
2410	rc = TRPMR3SetGuestTrapHandler(pVM, iGate, pNewHandlerGC);
2411	if (VBOX_FAILURE(rc))
2412	Log(("TRPMR3SetGuestTrapHandler %d failed with %Vrc\n", iGate, rc));
2413	}
2414	}
2415	}
2416	} /* for */
2417	STAM_PROFILE_STOP(&pVM->csam.s.StatCheckGates, a);
2418	return VINF_SUCCESS;
2419	}
2420
2421	/**
2422	* Query CSAM state (enabled/disabled)
2423	*
2424	* @returns 0 - disabled, 1 - enabled
2425	* @param pVM The VM to operate on.
2426	*/
2427	CSAMR3DECL(int) CSAMR3IsEnabled(PVM pVM)
2428	{
2429	return pVM->fCSAMEnabled;
2430	}
2431
2432	#ifdef VBOX_WITH_DEBUGGER
2433	/**
2434	* The '.csamoff' command.
2435	*
2436	* @returns VBox status.
2437	* @param pCmd Pointer to the command descriptor (as registered).
2438	* @param pCmdHlp Pointer to command helper functions.
2439	* @param pVM Pointer to the current VM (if any).
2440	* @param paArgs Pointer to (readonly) array of arguments.
2441	* @param cArgs Number of arguments in the array.
2442	*/
2443	static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2444	{
2445	/*
2446	* Validate input.
2447	*/
2448	if (!pVM)
2449	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2450
2451	CSAMDisableScanning(pVM);
2452	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning disabled\n");
2453	}
2454
2455	/**
2456	* The '.csamon' command.
2457	*
2458	* @returns VBox status.
2459	* @param pCmd Pointer to the command descriptor (as registered).
2460	* @param pCmdHlp Pointer to command helper functions.
2461	* @param pVM Pointer to the current VM (if any).
2462	* @param paArgs Pointer to (readonly) array of arguments.
2463	* @param cArgs Number of arguments in the array.
2464	*/
2465	static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult)
2466	{
2467	/*
2468	* Validate input.
2469	*/
2470	if (!pVM)
2471	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "error: The command requires VM to be selected.\n");
2472
2473	CSAMEnableScanning(pVM);
2474	return pCmdHlp->pfnPrintf(pCmdHlp, NULL, "CSAM Scanning enabled\n");
2475	}
2476	#endif

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/VMM/PATM/CSAM.cpp@ 3020

Download in other formats: