VirtualBox

source: vbox/trunk/src/VBox/VMM/PATM/PATMGuest.cpp@ 30084

Last change on this file since 30084 was 28800, checked in by vboxsync, 15 years ago

Automated rebranding to Oracle copyright/license strings via filemuncher
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 8.1 KB
Line 
1/* $Id: PATMGuest.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2/** @file
3 * PATMGuest - Guest OS Patching Manager (non-generic)
4 */
5
6/*
7 * Copyright (C) 2006-2007 Oracle Corporation
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
18/*******************************************************************************
19* Header Files *
20*******************************************************************************/
21#define LOG_GROUP LOG_GROUP_PATM
22#include <VBox/patm.h>
23#include <VBox/pgm.h>
24#include <VBox/iom.h>
25#include <VBox/param.h>
26#include <iprt/avl.h>
27#include "PATMInternal.h"
28#include <VBox/vm.h>
29#include <VBox/csam.h>
30
31#include <VBox/dbg.h>
32#include <VBox/err.h>
33#include <VBox/log.h>
34#include <iprt/assert.h>
35#include <iprt/string.h>
36#include <VBox/dis.h>
37#include <VBox/disopcode.h>
38
39/*
40 * ntdll!KiFastSystemCall:
41 * 7c90eb8b 8bd4 mov edx,esp
42 * 7c90eb8d 0f34 sysenter
43 * 7c90eb8f 90 nop
44 * 7c90eb90 90 nop
45 * 7c90eb91 90 nop
46 * 7c90eb92 90 nop
47 * 7c90eb93 90 nop
48 * ntdll!KiFastSystemCallRet:
49 * 7c90eb94 c3 ret
50 *
51 * ntdll!KiIntSystemCall:
52 * 7c90eba5 8d542408 lea edx,[esp+0x8]
53 * 7c90eba9 cd2e int 2e
54 * 7c90ebab c3 ret
55 *
56 */
57static uint8_t uFnKiFastSystemCall[7] = {0x8b, 0xd4, 0x0f, 0x34, 0x90, 0x90, 0x90};
58static uint8_t uFnKiIntSystemCall[7] = {0x8d, 0x54, 0x24, 0x08, 0xcd, 0x2e, 0xc3};
59
60/*
61 * OpenBSD 3.7 & 3.8:
62 *
63 * D0101B6D: push CS [0E]
64 * D0101B6E: push ESI [56]
65 * D0101B6F: cli [FA]
66 */
67static uint8_t uFnOpenBSDHandlerPrefix1[3] = { 0x0E, 0x56, 0xFA };
68/*
69 * OpenBSD 3.9 & 4.0
70 *
71 * D0101BD1: push CS [0E]
72 * D0101BD2: push ESI [56]
73 * D0101BD3: push 0x00 [6A 00]
74 * D0101BD4: push 0x03 [6A 03]
75 */
76static uint8_t uFnOpenBSDHandlerPrefix2[6] = { 0x0E, 0x56, 0x6A, 0x00, 0x6A, 0x03 };
77
78
79/**
80 * Check Windows XP sysenter heuristics and install patch
81 *
82 * @returns VBox status code.
83 * @param pVM The VM to operate on.
84 * @param pInstrGC GC Instruction pointer for sysenter
85 * @param pPatchRec Patch structure
86 *
87 */
88int PATMPatchSysenterXP(PVM pVM, RTGCPTR32 pInstrGC, PPATMPATCHREC pPatchRec)
89{
90 PPATCHINFO pPatch = &pPatchRec->patch;
91 uint8_t uTemp[16];
92 RTGCPTR32 lpfnKiFastSystemCall, lpfnKiIntSystemCall = 0; /* (initializing it to shut up warning.) */
93 int rc, i;
94 PVMCPU pVCpu = VMMGetCpu0(pVM);
95
96 Assert(sizeof(uTemp) > sizeof(uFnKiIntSystemCall));
97 Assert(sizeof(uTemp) > sizeof(uFnKiFastSystemCall));
98
99 /* Guest OS specific patch; check heuristics first */
100
101 /* check the epilog of KiFastSystemCall */
102 lpfnKiFastSystemCall = pInstrGC - 2;
103 rc = PGMPhysSimpleReadGCPtr(pVCpu, uTemp, lpfnKiFastSystemCall, sizeof(uFnKiFastSystemCall));
104 if ( RT_FAILURE(rc)
105 || memcmp(uFnKiFastSystemCall, uTemp, sizeof(uFnKiFastSystemCall)))
106 {
107 return VERR_PATCHING_REFUSED;
108 }
109
110 /* Now search for KiIntSystemCall */
111 for (i=0;i<64;i++)
112 {
113 rc = PGMPhysSimpleReadGCPtr(pVCpu, uTemp, pInstrGC + i, sizeof(uFnKiIntSystemCall));
114 if(RT_FAILURE(rc))
115 {
116 break;
117 }
118 if(!memcmp(uFnKiIntSystemCall, uTemp, sizeof(uFnKiIntSystemCall)))
119 {
120 lpfnKiIntSystemCall = pInstrGC + i;
121 /* Found it! */
122 break;
123 }
124 }
125 if (i == 64)
126 {
127 Log(("KiIntSystemCall not found!!\n"));
128 return VERR_PATCHING_REFUSED;
129 }
130
131 if (PAGE_ADDRESS(lpfnKiFastSystemCall) != PAGE_ADDRESS(lpfnKiIntSystemCall))
132 {
133 Log(("KiFastSystemCall and KiIntSystemCall not in the same page!!\n"));
134 return VERR_PATCHING_REFUSED;
135 }
136
137 // make a copy of the guest code bytes that will be overwritten
138 rc = PGMPhysSimpleReadGCPtr(pVCpu, pPatch->aPrivInstr, pPatch->pPrivInstrGC, SIZEOF_NEARJUMP32);
139 AssertRC(rc);
140
141 /* Now we simply jump from the fast version to the 'old and slow' system call */
142 uTemp[0] = 0xE9;
143 *(RTGCPTR32 *)&uTemp[1] = lpfnKiIntSystemCall - (pInstrGC + SIZEOF_NEARJUMP32);
144 rc = PGMPhysSimpleDirtyWriteGCPtr(pVCpu, pInstrGC, uTemp, SIZEOF_NEARJUMP32);
145 if (RT_FAILURE(rc))
146 {
147 Log(("PGMPhysSimpleDirtyWriteGCPtr failed with rc=%Rrc!!\n", rc));
148 return VERR_PATCHING_REFUSED;
149 }
150
151#ifdef LOG_ENABLED
152 Log(("Sysenter Patch code ----------------------------------------------------------\n"));
153 patmr3DisasmCodeStream(pVM, pInstrGC, pInstrGC, patmr3DisasmCallback, pPatch);
154 Log(("Sysenter Patch code ends -----------------------------------------------------\n"));
155#endif
156
157 pPatch->uState = PATCH_ENABLED;
158 return VINF_SUCCESS;
159}
160
161/**
162 * Patch OpenBSD interrupt handler prefix
163 *
164 * @returns VBox status code.
165 * @param pVM The VM to operate on
166 * @param pCpu Disassembly state of instruction.
167 * @param pInstrGC GC Instruction pointer for instruction
168 * @param pInstrHC GC Instruction pointer for instruction
169 * @param pPatchRec Patch structure
170 *
171 */
172int PATMPatchOpenBSDHandlerPrefix(PVM pVM, PDISCPUSTATE pCpu, RTGCPTR32 pInstrGC, uint8_t *pInstrHC, PPATMPATCHREC pPatchRec)
173{
174 uint8_t uTemp[16];
175 int rc;
176
177 Assert(sizeof(uTemp) > RT_MAX(sizeof(uFnOpenBSDHandlerPrefix1), sizeof(uFnOpenBSDHandlerPrefix2)));
178
179 /* Guest OS specific patch; check heuristics first */
180
181 rc = PGMPhysSimpleReadGCPtr(VMMGetCpu0(pVM), uTemp, pInstrGC, RT_MAX(sizeof(uFnOpenBSDHandlerPrefix1), sizeof(uFnOpenBSDHandlerPrefix2)));
182 if ( RT_FAILURE(rc)
183 || ( memcmp(uFnOpenBSDHandlerPrefix1, uTemp, sizeof(uFnOpenBSDHandlerPrefix1))
184 && memcmp(uFnOpenBSDHandlerPrefix2, uTemp, sizeof(uFnOpenBSDHandlerPrefix2))))
185 {
186 return VERR_PATCHING_REFUSED;
187 }
188 /* Found it; patch the push cs */
189 pPatchRec->patch.flags &= ~(PATMFL_GUEST_SPECIFIC); /* prevent a breakpoint from being triggered */
190 return PATMR3PatchInstrInt3(pVM, pInstrGC, pInstrHC, pCpu, &pPatchRec->patch);
191}
192
193/**
194 * Install guest OS specific patch
195 *
196 * @returns VBox status code.
197 * @param pVM The VM to operate on
198 * @param pCpu Disassembly state of instruction.
199 * @param pInstrGC GC Instruction pointer for instruction
200 * @param pInstrHC GC Instruction pointer for instruction
201 * @param pCallerGC GC address of caller; CODE32_UNKNOWN_CALLER if unknown
202 * @param pPatchRec Patch structure
203 *
204 */
205int PATMInstallGuestSpecificPatch(PVM pVM, PDISCPUSTATE pCpu, RTGCPTR32 pInstrGC, uint8_t *pInstrHC, PPATMPATCHREC pPatchRec)
206{
207 int rc;
208
209 /** @todo might have to check if the patch crosses a page boundary. Currently not necessary, but that might change in the future!! */
210 switch (pCpu->pCurInstr->opcode)
211 {
212 case OP_SYSENTER:
213 pPatchRec->patch.flags |= PATMFL_SYSENTER_XP | PATMFL_USER_MODE | PATMFL_GUEST_SPECIFIC;
214
215 rc = PATMPatchSysenterXP(pVM, pInstrGC, pPatchRec);
216 if (RT_FAILURE(rc))
217 {
218 return VERR_PATCHING_REFUSED;
219 }
220 return VINF_SUCCESS;
221
222 case OP_PUSH:
223 /* OpenBSD guest specific patch for the following code block:
224 *
225 * pushf
226 * push cs <- dangerous because of DPL 0 tests
227 * push esi
228 * cli
229 */
230 if (pCpu->pCurInstr->param1 == OP_PARM_REG_CS)
231 return PATMPatchOpenBSDHandlerPrefix(pVM, pCpu, pInstrGC, pInstrHC, pPatchRec);
232
233 return VERR_PATCHING_REFUSED;
234
235 default:
236 AssertMsgFailed(("PATMInstallGuestSpecificPatch: unknown opcode %d\n", pCpu->pCurInstr->opcode));
237 return VERR_PATCHING_REFUSED;
238 }
239 return VERR_PATCHING_REFUSED;
240}
241
Note: See TracBrowser for help on using the repository browser.

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette