1 | /* $Id: CSAM.cpp 1996 2007-04-09 13:36:57Z vboxsync $ */
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2 | /** @file
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3 | * CSAM - Guest OS Code Scanning and Analysis Manager
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006 InnoTek Systemberatung GmbH
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License as published by the Free Software Foundation,
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13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * If you received this file as part of a commercial VirtualBox
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18 | * distribution, then only the terms of your commercial VirtualBox
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19 | * license agreement apply instead of the previous paragraph.
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20 | */
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21 |
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22 | /*******************************************************************************
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23 | * Header Files *
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24 | *******************************************************************************/
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25 | #define LOG_GROUP LOG_GROUP_CSAM
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26 | #include <VBox/cpum.h>
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27 | #include <VBox/stam.h>
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28 | #include <VBox/patm.h>
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29 | #include <VBox/csam.h>
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30 | #include <VBox/cpumdis.h>
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31 | #include <VBox/pgm.h>
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32 | #include <VBox/iom.h>
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33 | #include <VBox/sup.h>
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34 | #include <VBox/mm.h>
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35 | #include <VBox/em.h>
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36 | #include <VBox/rem.h>
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37 | #include <VBox/selm.h>
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38 | #include <VBox/trpm.h>
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39 | #include <VBox/cfgm.h>
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40 | #include <VBox/param.h>
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41 | #include <iprt/avl.h>
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42 | #include <iprt/asm.h>
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43 | #include <iprt/thread.h>
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44 | #include "CSAMInternal.h"
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45 | #include <VBox/vm.h>
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46 | #include <VBox/dbg.h>
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47 | #include <VBox/err.h>
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48 | #include <VBox/ssm.h>
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49 | #include <VBox/log.h>
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50 | #include <iprt/assert.h>
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51 | #include <iprt/string.h>
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52 | #include <VBox/dis.h>
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53 | #include <VBox/disopcode.h>
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54 | #include <stdlib.h>
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55 | #include <stdio.h>
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56 |
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57 |
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58 | /* Enabled by default */
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59 | #define CSAM_ENABLE
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60 |
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61 | /* Enable to monitor code pages for self-modifying code. */
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62 | #define CSAM_MONITOR_CODE_PAGES
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63 | /* Enable to monitor all scanned pages
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64 | #define CSAM_MONITOR_CSAM_CODE_PAGES */
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65 | /* Enable to scan beyond ret instructions.
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66 | #define CSAM_ANALYSE_BEYOND_RET */
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67 |
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68 | /*******************************************************************************
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69 | * Internal Functions *
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70 | *******************************************************************************/
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71 | static DECLCALLBACK(int) csamr3Save(PVM pVM, PSSMHANDLE pSSM);
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72 | static DECLCALLBACK(int) csamr3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t u32Version);
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73 | static DECLCALLBACK(int) CSAMCodePageWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
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74 | static DECLCALLBACK(int) CSAMCodePageInvalidate(PVM pVM, RTGCPTR GCPtr);
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75 |
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76 | bool csamIsCodeScanned(PVM pVM, RTGCPTR pInstr, PCSAMPAGE *pPage);
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77 | int csamR3CheckPageRecord(PVM pVM, RTGCPTR pInstr);
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78 | static PCSAMPAGE csamCreatePageRecord(PVM pVM, RTGCPTR GCPtr, CSAMTAG enmTag, bool fCode32, bool fMonitorInvalidation = false);
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79 | static int csamRemovePageRecord(PVM pVM, RTGCPTR GCPtr);
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80 | static int csamReinit(PVM pVM);
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81 | static void csamMarkCode(PVM pVM, PCSAMPAGE pPage, RTGCPTR pInstr, uint32_t opsize, bool fScanned);
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82 | static int csamAnalyseCodeStream(PVM pVM, GCPTRTYPE(uint8_t *) pInstrGC, GCPTRTYPE(uint8_t *) pCurInstrGC, bool fCode32,
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83 | PFN_CSAMR3ANALYSE pfnCSAMR3Analyse, void *pUserData, PCSAMP2GLOOKUPREC pCacheRec);
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84 |
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85 | /** @todo Temporary for debugging. */
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86 | static bool fInCSAMCodePageInvalidate = false;
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87 |
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88 | /*******************************************************************************
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89 | * Global Variables *
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90 | *******************************************************************************/
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91 | #ifdef VBOX_WITH_DEBUGGER
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92 | static DECLCALLBACK(int) csamr3CmdOn(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
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93 | static DECLCALLBACK(int) csamr3CmdOff(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs, PDBGCVAR pResult);
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94 |
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95 | /** Command descriptors. */
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96 | static const DBGCCMD g_aCmds[] =
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97 | {
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98 | /* pszCmd, cArgsMin, cArgsMax, paArgDesc, cArgDescs, pResultDesc, fFlags, pfnHandler pszSyntax, ....pszDescription */
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99 | { "csamon", 0, 0, NULL, 0, NULL, 0, csamr3CmdOn, "", "Enable CSAM code scanning." },
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100 | { "csamoff", 0, 0, NULL, 0, NULL, 0, csamr3CmdOff, "", "Disable CSAM code scanning." },
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101 | };
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102 | #endif
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103 |
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104 |
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105 | /**
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106 | * Initializes the CSAM.
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107 | *
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108 | * @returns VBox status code.
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109 | * @param pVM The VM to operate on.
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110 | */
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111 | CSAMR3DECL(int) CSAMR3Init(PVM pVM)
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112 | {
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113 | int rc;
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114 |
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115 | LogFlow(("CSAMR3Init\n"));
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116 |
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117 | /* Allocate bitmap for the page directory. */
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118 | rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKS*sizeof(RTHCPTR), 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDBitmapHC);
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119 | AssertRCReturn(rc, rc);
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120 | rc = MMR3HyperAllocOnceNoRel(pVM, CSAM_PGDIRBMP_CHUNKS*sizeof(RTGCPTR), 0, MM_TAG_CSAM, (void **)&pVM->csam.s.pPDGCBitmapHC);
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121 | AssertRCReturn(rc, rc);
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122 | pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
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123 | pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
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124 |
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125 | rc = csamReinit(pVM);
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126 | AssertRCReturn(rc, rc);
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127 |
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128 | /*
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129 | * Register save and load state notificators.
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130 | */
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131 | rc = SSMR3RegisterInternal(pVM, "CSAM", 0, CSAM_SSM_VERSION, sizeof(pVM->csam.s) + PAGE_SIZE*16,
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132 | NULL, csamr3Save, NULL,
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133 | NULL, csamr3Load, NULL);
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134 | AssertRCReturn(rc, rc);
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135 |
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136 | STAM_REG(pVM, &pVM->csam.s.StatNrTraps, STAMTYPE_COUNTER, "/CSAM/PageTraps", STAMUNIT_OCCURENCES, "The number of CSAM page traps.");
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137 | STAM_REG(pVM, &pVM->csam.s.StatDangerousWrite, STAMTYPE_COUNTER, "/CSAM/DangerousWrites", STAMUNIT_OCCURENCES, "The number of dangerous writes that cause a context switch.");
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138 |
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139 | STAM_REG(pVM, &pVM->csam.s.StatNrPageNPHC, STAMTYPE_COUNTER, "/CSAM/HC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
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140 | STAM_REG(pVM, &pVM->csam.s.StatNrPageNPGC, STAMTYPE_COUNTER, "/CSAM/GC/PageNotPresent", STAMUNIT_OCCURENCES, "The number of CSAM pages marked not present.");
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141 | STAM_REG(pVM, &pVM->csam.s.StatNrPages, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRW", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW monitoring).");
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142 | STAM_REG(pVM, &pVM->csam.s.StatNrPagesInv, STAMTYPE_COUNTER, "/CSAM/PageRec/AddedRWI", STAMUNIT_OCCURENCES, "The number of CSAM page records (RW & invalidation monitoring).");
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143 | STAM_REG(pVM, &pVM->csam.s.StatNrRemovedPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Removed", STAMUNIT_OCCURENCES, "The number of removed CSAM page records.");
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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.");
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145 |
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146 | STAM_REG(pVM, &pVM->csam.s.StatNrPatchPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Patch", STAMUNIT_OCCURENCES, "The number of CSAM patch page records.");
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147 | STAM_REG(pVM, &pVM->csam.s.StatNrUserPages, STAMTYPE_COUNTER, "/CSAM/PageRec/Ignore/User", STAMUNIT_OCCURENCES, "The number of CSAM user page records (ignored).");
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148 | STAM_REG(pVM, &pVM->csam.s.StatPagePATM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/PATM", STAMUNIT_OCCURENCES, "The number of PATM page records.");
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149 | STAM_REG(pVM, &pVM->csam.s.StatPageCSAM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/CSAM", STAMUNIT_OCCURENCES, "The number of CSAM page records.");
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150 | STAM_REG(pVM, &pVM->csam.s.StatPageREM, STAMTYPE_COUNTER, "/CSAM/PageRec/Type/REM", STAMUNIT_OCCURENCES, "The number of REM page records.");
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151 | STAM_REG(pVM, &pVM->csam.s.StatPageMonitor, STAMTYPE_COUNTER, "/CSAM/PageRec/Monitored", STAMUNIT_OCCURENCES, "The number of monitored pages.");
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152 |
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153 | STAM_REG(pVM, &pVM->csam.s.StatCodePageModified, STAMTYPE_COUNTER, "/CSAM/Monitor/DirtyPage", STAMUNIT_OCCURENCES, "The number of code page modifications.");
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154 |
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155 | STAM_REG(pVM, &pVM->csam.s.StatNrFlushes, STAMTYPE_COUNTER, "/CSAM/PageFlushes", STAMUNIT_OCCURENCES, "The number of CSAM page flushes.");
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156 | STAM_REG(pVM, &pVM->csam.s.StatNrFlushesSkipped, STAMTYPE_COUNTER, "/CSAM/PageFlushesSkipped", STAMUNIT_OCCURENCES, "The number of CSAM page flushes that were skipped.");
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157 | STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesHC, STAMTYPE_COUNTER, "/CSAM/HC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
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158 | STAM_REG(pVM, &pVM->csam.s.StatNrKnownPagesGC, STAMTYPE_COUNTER, "/CSAM/GC/KnownPageRecords", STAMUNIT_OCCURENCES, "The number of known CSAM page records.");
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159 | STAM_REG(pVM, &pVM->csam.s.StatNrInstr, STAMTYPE_COUNTER, "/CSAM/ScannedInstr", STAMUNIT_OCCURENCES, "The number of scanned instructions.");
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160 | STAM_REG(pVM, &pVM->csam.s.StatNrBytesRead, STAMTYPE_COUNTER, "/CSAM/BytesRead", STAMUNIT_OCCURENCES, "The number of bytes read for scanning.");
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161 | STAM_REG(pVM, &pVM->csam.s.StatNrOpcodeRead, STAMTYPE_COUNTER, "/CSAM/OpcodeBytesRead", STAMUNIT_OCCURENCES, "The number of opcode bytes read by the recompiler.");
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162 |
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163 | STAM_REG(pVM, &pVM->csam.s.StatBitmapAlloc, STAMTYPE_COUNTER, "/CSAM/Alloc/PageBitmap", STAMUNIT_OCCURENCES, "The number of page bitmap allocations.");
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164 |
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165 | STAM_REG(pVM, &pVM->csam.s.StatInstrCacheHit, STAMTYPE_COUNTER, "/CSAM/Cache/Hit", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache hits.");
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166 | STAM_REG(pVM, &pVM->csam.s.StatInstrCacheMiss, STAMTYPE_COUNTER, "/CSAM/Cache/Miss", STAMUNIT_OCCURENCES, "The number of dangerous instruction cache misses.");
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167 |
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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.");
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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.");
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170 |
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171 | STAM_REG(pVM, &pVM->csam.s.StatTime, STAMTYPE_PROFILE, "/PROF/CSAM/Scan", STAMUNIT_TICKS_PER_CALL, "Scanning overhead.");
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172 | STAM_REG(pVM, &pVM->csam.s.StatTimeCheckAddr, STAMTYPE_PROFILE, "/PROF/CSAM/CheckAddr", STAMUNIT_TICKS_PER_CALL, "Address check overhead.");
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173 | STAM_REG(pVM, &pVM->csam.s.StatTimeAddrConv, STAMTYPE_PROFILE, "/PROF/CSAM/AddrConv", STAMUNIT_TICKS_PER_CALL, "Address conversion overhead.");
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174 | STAM_REG(pVM, &pVM->csam.s.StatTimeFlushPage, STAMTYPE_PROFILE, "/PROF/CSAM/FlushPage", STAMUNIT_TICKS_PER_CALL, "Page flushing overhead.");
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175 | STAM_REG(pVM, &pVM->csam.s.StatTimeDisasm, STAMTYPE_PROFILE, "/PROF/CSAM/Disasm", STAMUNIT_TICKS_PER_CALL, "Disassembly overhead.");
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176 | STAM_REG(pVM, &pVM->csam.s.StatFlushDirtyPages, STAMTYPE_PROFILE, "/PROF/CSAM/FlushDirtyPage", STAMUNIT_TICKS_PER_CALL, "Dirty page flushing overhead.");
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177 | STAM_REG(pVM, &pVM->csam.s.StatCheckGates, STAMTYPE_PROFILE, "/PROF/CSAM/CheckGates", STAMUNIT_TICKS_PER_CALL, "CSAMR3CheckGates overhead.");
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178 |
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179 | /*
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180 | * Check CFGM option and enable/disable CSAM.
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181 | */
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182 | bool fEnabled;
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183 | rc = CFGMR3QueryBool(CFGMR3GetRoot(pVM), "CSAMEnabled", &fEnabled);
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184 | if (VBOX_FAILURE(rc))
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185 | #ifdef CSAM_ENABLE
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186 | fEnabled = true;
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187 | #else
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188 | fEnabled = false;
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189 | #endif
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190 | if (fEnabled)
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191 | CSAMEnableScanning(pVM);
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192 |
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193 | #ifdef VBOX_WITH_DEBUGGER
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194 | /*
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195 | * Debugger commands.
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196 | */
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197 | static bool fRegisteredCmds = false;
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198 | if (!fRegisteredCmds)
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199 | {
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200 | int rc = DBGCRegisterCommands(&g_aCmds[0], ELEMENTS(g_aCmds));
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201 | if (VBOX_SUCCESS(rc))
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202 | fRegisteredCmds = true;
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203 | }
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204 | #endif
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205 |
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206 | return VINF_SUCCESS;
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207 | }
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208 |
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209 | /**
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210 | * (Re)initializes CSAM
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211 | *
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212 | * @param pVM The VM.
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213 | */
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214 | static int csamReinit(PVM pVM)
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215 | {
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216 | /*
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217 | * Assert alignment and sizes.
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218 | */
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219 | AssertRelease(!(RT_OFFSETOF(VM, csam.s) & 31));
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220 | AssertRelease(sizeof(pVM->csam.s) <= sizeof(pVM->csam.padding));
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221 |
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222 | /*
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223 | * Setup any fixed pointers and offsets.
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224 | */
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225 | pVM->csam.s.offVM = RT_OFFSETOF(VM, patm);
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226 |
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227 | pVM->csam.s.fGatesChecked = false;
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228 | pVM->csam.s.fScanningStarted = false;
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229 |
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230 | VM_FF_CLEAR(pVM, VM_FF_CSAM_PENDING_ACTION);
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231 | pVM->csam.s.cDirtyPages = 0;
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232 | /* not necessary */
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233 | memset(pVM->csam.s.pvDirtyBasePage, 0, sizeof(pVM->csam.s.pvDirtyBasePage));
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234 | memset(pVM->csam.s.pvDirtyFaultPage, 0, sizeof(pVM->csam.s.pvDirtyFaultPage));
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235 |
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236 | memset(&pVM->csam.s.aDangerousInstr, 0, sizeof(pVM->csam.s.aDangerousInstr));
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237 | pVM->csam.s.cDangerousInstr = 0;
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238 | pVM->csam.s.iDangerousInstr = 0;
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239 |
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240 | /** @note never mess with the pgdir bitmap here! */
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241 | return VINF_SUCCESS;
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242 | }
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243 |
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244 | /**
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245 | * Applies relocations to data and code managed by this
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246 | * component. This function will be called at init and
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247 | * whenever the VMM need to relocate itself inside the GC.
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248 | *
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249 | * The csam will update the addresses used by the switcher.
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250 | *
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251 | * @param pVM The VM.
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252 | * @param offDelta Relocation delta.
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253 | */
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254 | CSAMR3DECL(void) CSAMR3Relocate(PVM pVM, RTGCINTPTR offDelta)
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255 | {
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256 | if (offDelta)
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257 | {
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258 | /* Adjust pgdir and page bitmap pointers. */
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259 | pVM->csam.s.pPDBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDGCBitmapHC);
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260 | pVM->csam.s.pPDHCBitmapGC = MMHyperHC2GC(pVM, pVM->csam.s.pPDBitmapHC);
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261 |
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262 | for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
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263 | {
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264 | if (pVM->csam.s.pPDGCBitmapHC[i])
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265 | {
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266 | pVM->csam.s.pPDGCBitmapHC[i] += offDelta;
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267 | }
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268 | }
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269 | }
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270 | return;
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271 | }
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272 |
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273 | /**
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274 | * Terminates the csam.
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275 | *
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276 | * Termination means cleaning up and freeing all resources,
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277 | * the VM it self is at this point powered off or suspended.
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278 | *
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279 | * @returns VBox status code.
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280 | * @param pVM The VM to operate on.
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281 | */
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282 | CSAMR3DECL(int) CSAMR3Term(PVM pVM)
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283 | {
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284 | int rc;
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285 |
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286 | rc = CSAMR3Reset(pVM);
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287 | AssertRC(rc);
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288 |
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289 | /* @todo triggers assertion in MMHyperFree */
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290 | #if 0
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291 | for(int i=0;i<CSAM_PAGEBMP_CHUNKS;i++)
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292 | {
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293 | if (pVM->csam.s.pPDBitmapHC[i])
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294 | MMHyperFree(pVM, pVM->csam.s.pPDBitmapHC[i]);
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295 | }
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296 | #endif
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297 |
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298 | return VINF_SUCCESS;
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299 | }
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300 |
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301 | /**
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302 | * CSAM reset callback.
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303 | *
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304 | * @returns VBox status code.
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305 | * @param pVM The VM which is reset.
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306 | */
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307 | CSAMR3DECL(int) CSAMR3Reset(PVM pVM)
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308 | {
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309 | /* Clear page bitmaps. */
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310 | for(int i=0;i<CSAM_PGDIRBMP_CHUNKS;i++)
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311 | {
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312 | if (pVM->csam.s.pPDBitmapHC[i])
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313 | {
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314 | Assert((CSAM_PAGE_BITMAP_SIZE& 3) == 0);
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315 | ASMMemZero32(pVM->csam.s.pPDBitmapHC[i], CSAM_PAGE_BITMAP_SIZE);
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316 | }
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317 | }
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318 |
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319 | /* Remove all CSAM page records. */
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320 | while(true)
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321 | {
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322 | PCSAMPAGEREC pPageRec = (PCSAMPAGEREC)RTAvlPVGetBestFit(&pVM->csam.s.pPageTree, 0, true);
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323 | if (pPageRec)
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324 | {
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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
|
---|