| 1 | /* $Id: PATMGuest.cpp 26152 2010-02-02 16:00:35Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * PATMGuest - Guest OS Patching Manager (non-generic)
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
|
|---|
| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
|
|---|
| 19 | * additional information or have any questions.
|
|---|
| 20 | */
|
|---|
| 21 |
|
|---|
| 22 | /*******************************************************************************
|
|---|
| 23 | * Header Files *
|
|---|
| 24 | *******************************************************************************/
|
|---|
| 25 | #define LOG_GROUP LOG_GROUP_PATM
|
|---|
| 26 | #include <VBox/patm.h>
|
|---|
| 27 | #include <VBox/pgm.h>
|
|---|
| 28 | #include <VBox/iom.h>
|
|---|
| 29 | #include <VBox/param.h>
|
|---|
| 30 | #include <iprt/avl.h>
|
|---|
| 31 | #include "PATMInternal.h"
|
|---|
| 32 | #include <VBox/vm.h>
|
|---|
| 33 | #include <VBox/csam.h>
|
|---|
| 34 |
|
|---|
| 35 | #include <VBox/dbg.h>
|
|---|
| 36 | #include <VBox/err.h>
|
|---|
| 37 | #include <VBox/log.h>
|
|---|
| 38 | #include <iprt/assert.h>
|
|---|
| 39 | #include <iprt/string.h>
|
|---|
| 40 | #include <VBox/dis.h>
|
|---|
| 41 | #include <VBox/disopcode.h>
|
|---|
| 42 |
|
|---|
| 43 | /*
|
|---|
| 44 | * ntdll!KiFastSystemCall:
|
|---|
| 45 | * 7c90eb8b 8bd4 mov edx,esp
|
|---|
| 46 | * 7c90eb8d 0f34 sysenter
|
|---|
| 47 | * 7c90eb8f 90 nop
|
|---|
| 48 | * 7c90eb90 90 nop
|
|---|
| 49 | * 7c90eb91 90 nop
|
|---|
| 50 | * 7c90eb92 90 nop
|
|---|
| 51 | * 7c90eb93 90 nop
|
|---|
| 52 | * ntdll!KiFastSystemCallRet:
|
|---|
| 53 | * 7c90eb94 c3 ret
|
|---|
| 54 | *
|
|---|
| 55 | * ntdll!KiIntSystemCall:
|
|---|
| 56 | * 7c90eba5 8d542408 lea edx,[esp+0x8]
|
|---|
| 57 | * 7c90eba9 cd2e int 2e
|
|---|
| 58 | * 7c90ebab c3 ret
|
|---|
| 59 | *
|
|---|
| 60 | */
|
|---|
| 61 | static uint8_t uFnKiFastSystemCall[7] = {0x8b, 0xd4, 0x0f, 0x34, 0x90, 0x90, 0x90};
|
|---|
| 62 | static uint8_t uFnKiIntSystemCall[7] = {0x8d, 0x54, 0x24, 0x08, 0xcd, 0x2e, 0xc3};
|
|---|
| 63 |
|
|---|
| 64 | /*
|
|---|
| 65 | * OpenBSD 3.7 & 3.8:
|
|---|
| 66 | *
|
|---|
| 67 | * D0101B6D: push CS [0E]
|
|---|
| 68 | * D0101B6E: push ESI [56]
|
|---|
| 69 | * D0101B6F: cli [FA]
|
|---|
| 70 | */
|
|---|
| 71 | static uint8_t uFnOpenBSDHandlerPrefix1[3] = { 0x0E, 0x56, 0xFA };
|
|---|
| 72 | /*
|
|---|
| 73 | * OpenBSD 3.9 & 4.0
|
|---|
| 74 | *
|
|---|
| 75 | * D0101BD1: push CS [0E]
|
|---|
| 76 | * D0101BD2: push ESI [56]
|
|---|
| 77 | * D0101BD3: push 0x00 [6A 00]
|
|---|
| 78 | * D0101BD4: push 0x03 [6A 03]
|
|---|
| 79 | */
|
|---|
| 80 | static uint8_t uFnOpenBSDHandlerPrefix2[6] = { 0x0E, 0x56, 0x6A, 0x00, 0x6A, 0x03 };
|
|---|
| 81 |
|
|---|
| 82 |
|
|---|
| 83 | /**
|
|---|
| 84 | * Check Windows XP sysenter heuristics and install patch
|
|---|
| 85 | *
|
|---|
| 86 | * @returns VBox status code.
|
|---|
| 87 | * @param pVM The VM to operate on.
|
|---|
| 88 | * @param pInstrGC GC Instruction pointer for sysenter
|
|---|
| 89 | * @param pPatchRec Patch structure
|
|---|
| 90 | *
|
|---|
| 91 | */
|
|---|
| 92 | int PATMPatchSysenterXP(PVM pVM, RTGCPTR32 pInstrGC, PPATMPATCHREC pPatchRec)
|
|---|
| 93 | {
|
|---|
| 94 | PPATCHINFO pPatch = &pPatchRec->patch;
|
|---|
| 95 | uint8_t uTemp[16];
|
|---|
| 96 | RTGCPTR32 lpfnKiFastSystemCall, lpfnKiIntSystemCall = 0; /* (initializing it to shut up warning.) */
|
|---|
| 97 | int rc, i;
|
|---|
| 98 | PVMCPU pVCpu = VMMGetCpu0(pVM);
|
|---|
| 99 |
|
|---|
| 100 | Assert(sizeof(uTemp) > sizeof(uFnKiIntSystemCall));
|
|---|
| 101 | Assert(sizeof(uTemp) > sizeof(uFnKiFastSystemCall));
|
|---|
| 102 |
|
|---|
| 103 | /* Guest OS specific patch; check heuristics first */
|
|---|
| 104 |
|
|---|
| 105 | /* check the epilog of KiFastSystemCall */
|
|---|
| 106 | lpfnKiFastSystemCall = pInstrGC - 2;
|
|---|
| 107 | rc = PGMPhysSimpleReadGCPtr(pVCpu, uTemp, lpfnKiFastSystemCall, sizeof(uFnKiFastSystemCall));
|
|---|
| 108 | if ( RT_FAILURE(rc)
|
|---|
| 109 | || memcmp(uFnKiFastSystemCall, uTemp, sizeof(uFnKiFastSystemCall)))
|
|---|
| 110 | {
|
|---|
| 111 | return VERR_PATCHING_REFUSED;
|
|---|
| 112 | }
|
|---|
| 113 |
|
|---|
| 114 | /* Now search for KiIntSystemCall */
|
|---|
| 115 | for (i=0;i<64;i++)
|
|---|
| 116 | {
|
|---|
| 117 | rc = PGMPhysSimpleReadGCPtr(pVCpu, uTemp, pInstrGC + i, sizeof(uFnKiIntSystemCall));
|
|---|
| 118 | if(RT_FAILURE(rc))
|
|---|
| 119 | {
|
|---|
| 120 | break;
|
|---|
| 121 | }
|
|---|
| 122 | if(!memcmp(uFnKiIntSystemCall, uTemp, sizeof(uFnKiIntSystemCall)))
|
|---|
| 123 | {
|
|---|
| 124 | lpfnKiIntSystemCall = pInstrGC + i;
|
|---|
| 125 | /* Found it! */
|
|---|
| 126 | break;
|
|---|
| 127 | }
|
|---|
| 128 | }
|
|---|
| 129 | if (i == 64)
|
|---|
| 130 | {
|
|---|
| 131 | Log(("KiIntSystemCall not found!!\n"));
|
|---|
| 132 | return VERR_PATCHING_REFUSED;
|
|---|
| 133 | }
|
|---|
| 134 |
|
|---|
| 135 | if (PAGE_ADDRESS(lpfnKiFastSystemCall) != PAGE_ADDRESS(lpfnKiIntSystemCall))
|
|---|
| 136 | {
|
|---|
| 137 | Log(("KiFastSystemCall and KiIntSystemCall not in the same page!!\n"));
|
|---|
| 138 | return VERR_PATCHING_REFUSED;
|
|---|
| 139 | }
|
|---|
| 140 |
|
|---|
| 141 | // make a copy of the guest code bytes that will be overwritten
|
|---|
| 142 | rc = PGMPhysSimpleReadGCPtr(pVCpu, pPatch->aPrivInstr, pPatch->pPrivInstrGC, SIZEOF_NEARJUMP32);
|
|---|
| 143 | AssertRC(rc);
|
|---|
| 144 |
|
|---|
| 145 | /* Now we simply jump from the fast version to the 'old and slow' system call */
|
|---|
| 146 | uTemp[0] = 0xE9;
|
|---|
| 147 | *(RTGCPTR32 *)&uTemp[1] = lpfnKiIntSystemCall - (pInstrGC + SIZEOF_NEARJUMP32);
|
|---|
| 148 | rc = PGMPhysSimpleDirtyWriteGCPtr(pVCpu, pInstrGC, uTemp, SIZEOF_NEARJUMP32);
|
|---|
| 149 | if (RT_FAILURE(rc))
|
|---|
| 150 | {
|
|---|
| 151 | Log(("PGMPhysSimpleDirtyWriteGCPtr failed with rc=%Rrc!!\n", rc));
|
|---|
| 152 | return VERR_PATCHING_REFUSED;
|
|---|
| 153 | }
|
|---|
| 154 |
|
|---|
| 155 | #ifdef LOG_ENABLED
|
|---|
| 156 | Log(("Sysenter Patch code ----------------------------------------------------------\n"));
|
|---|
| 157 | patmr3DisasmCodeStream(pVM, pInstrGC, pInstrGC, patmr3DisasmCallback, pPatch);
|
|---|
| 158 | Log(("Sysenter Patch code ends -----------------------------------------------------\n"));
|
|---|
| 159 | #endif
|
|---|
| 160 |
|
|---|
| 161 | pPatch->uState = PATCH_ENABLED;
|
|---|
| 162 | return VINF_SUCCESS;
|
|---|
| 163 | }
|
|---|
| 164 |
|
|---|
| 165 | /**
|
|---|
| 166 | * Patch OpenBSD interrupt handler prefix
|
|---|
| 167 | *
|
|---|
| 168 | * @returns VBox status code.
|
|---|
| 169 | * @param pVM The VM to operate on
|
|---|
| 170 | * @param pCpu Disassembly state of instruction.
|
|---|
| 171 | * @param pInstrGC GC Instruction pointer for instruction
|
|---|
| 172 | * @param pInstrHC GC Instruction pointer for instruction
|
|---|
| 173 | * @param pPatchRec Patch structure
|
|---|
| 174 | *
|
|---|
| 175 | */
|
|---|
| 176 | int PATMPatchOpenBSDHandlerPrefix(PVM pVM, PDISCPUSTATE pCpu, RTGCPTR32 pInstrGC, uint8_t *pInstrHC, PPATMPATCHREC pPatchRec)
|
|---|
| 177 | {
|
|---|
| 178 | uint8_t uTemp[16];
|
|---|
| 179 | int rc;
|
|---|
| 180 |
|
|---|
| 181 | Assert(sizeof(uTemp) > RT_MAX(sizeof(uFnOpenBSDHandlerPrefix1), sizeof(uFnOpenBSDHandlerPrefix2)));
|
|---|
| 182 |
|
|---|
| 183 | /* Guest OS specific patch; check heuristics first */
|
|---|
| 184 |
|
|---|
| 185 | rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), uTemp, pInstrGC, RT_MAX(sizeof(uFnOpenBSDHandlerPrefix1), sizeof(uFnOpenBSDHandlerPrefix2)));
|
|---|
| 186 | if ( RT_FAILURE(rc)
|
|---|
| 187 | || ( memcmp(uFnOpenBSDHandlerPrefix1, uTemp, sizeof(uFnOpenBSDHandlerPrefix1))
|
|---|
| 188 | && memcmp(uFnOpenBSDHandlerPrefix2, uTemp, sizeof(uFnOpenBSDHandlerPrefix2))))
|
|---|
| 189 | {
|
|---|
| 190 | return VERR_PATCHING_REFUSED;
|
|---|
| 191 | }
|
|---|
| 192 | /* Found it; patch the push cs */
|
|---|
| 193 | pPatchRec->patch.flags &= ~(PATMFL_GUEST_SPECIFIC); /* prevent a breakpoint from being triggered */
|
|---|
| 194 | return PATMR3PatchInstrInt3(pVM, pInstrGC, pInstrHC, pCpu, &pPatchRec->patch);
|
|---|
| 195 | }
|
|---|
| 196 |
|
|---|
| 197 | /**
|
|---|
| 198 | * Install guest OS specific patch
|
|---|
| 199 | *
|
|---|
| 200 | * @returns VBox status code.
|
|---|
| 201 | * @param pVM The VM to operate on
|
|---|
| 202 | * @param pCpu Disassembly state of instruction.
|
|---|
| 203 | * @param pInstrGC GC Instruction pointer for instruction
|
|---|
| 204 | * @param pInstrHC GC Instruction pointer for instruction
|
|---|
| 205 | * @param pCallerGC GC address of caller; CODE32_UNKNOWN_CALLER if unknown
|
|---|
| 206 | * @param pPatchRec Patch structure
|
|---|
| 207 | *
|
|---|
| 208 | */
|
|---|
| 209 | int PATMInstallGuestSpecificPatch(PVM pVM, PDISCPUSTATE pCpu, RTGCPTR32 pInstrGC, uint8_t *pInstrHC, PPATMPATCHREC pPatchRec)
|
|---|
| 210 | {
|
|---|
| 211 | int rc;
|
|---|
| 212 |
|
|---|
| 213 | /** @todo might have to check if the patch crosses a page boundary. Currently not necessary, but that might change in the future!! */
|
|---|
| 214 | switch (pCpu->pCurInstr->opcode)
|
|---|
| 215 | {
|
|---|
| 216 | case OP_SYSENTER:
|
|---|
| 217 | pPatchRec->patch.flags |= PATMFL_SYSENTER_XP | PATMFL_USER_MODE | PATMFL_GUEST_SPECIFIC;
|
|---|
| 218 |
|
|---|
| 219 | rc = PATMPatchSysenterXP(pVM, pInstrGC, pPatchRec);
|
|---|
| 220 | if (RT_FAILURE(rc))
|
|---|
| 221 | {
|
|---|
| 222 | return VERR_PATCHING_REFUSED;
|
|---|
| 223 | }
|
|---|
| 224 | return VINF_SUCCESS;
|
|---|
| 225 |
|
|---|
| 226 | case OP_PUSH:
|
|---|
| 227 | /* OpenBSD guest specific patch for the following code block:
|
|---|
| 228 | *
|
|---|
| 229 | * pushf
|
|---|
| 230 | * push cs <- dangerous because of DPL 0 tests
|
|---|
| 231 | * push esi
|
|---|
| 232 | * cli
|
|---|
| 233 | */
|
|---|
| 234 | if (pCpu->pCurInstr->param1 == OP_PARM_REG_CS)
|
|---|
| 235 | return PATMPatchOpenBSDHandlerPrefix(pVM, pCpu, pInstrGC, pInstrHC, pPatchRec);
|
|---|
| 236 |
|
|---|
| 237 | return VERR_PATCHING_REFUSED;
|
|---|
| 238 |
|
|---|
| 239 | default:
|
|---|
| 240 | AssertMsgFailed(("PATMInstallGuestSpecificPatch: unknown opcode %d\n", pCpu->pCurInstr->opcode));
|
|---|
| 241 | return VERR_PATCHING_REFUSED;
|
|---|
| 242 | }
|
|---|
| 243 | return VERR_PATCHING_REFUSED;
|
|---|
| 244 | }
|
|---|
| 245 |
|
|---|
