1 | ; $Id: SUPR3HardenedMainA-win.asm 69496 2017-10-28 14:55:58Z vboxsync $
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2 | ;; @file
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3 | ; VirtualBox Support Library - Hardened main(), Windows assembly bits.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2012-2017 Oracle Corporation
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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 (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 | ;*******************************************************************************
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28 | ;* Header Files *
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29 | ;*******************************************************************************
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30 | %define RT_ASM_WITH_SEH64
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31 | %include "iprt/asmdefs.mac"
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32 |
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33 |
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34 | ; External code.
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35 | extern NAME(supR3HardenedEarlyProcessInit)
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36 |
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37 |
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38 | BEGINCODE
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39 |
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40 |
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41 | ;;
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42 | ; Alternative code for LdrInitializeThunk that performs the early process startup
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43 | ; for the Stub and VM processes.
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44 | ;
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45 | ; This does not concern itself with any arguments on stack or in registers that
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46 | ; may be passed to the LdrIntializeThunk routine as we just save and restore
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47 | ; them all before we restart the restored LdrInitializeThunk routine.
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48 | ;
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49 | ; @sa supR3HardenedEarlyProcessInit
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50 | ;
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51 | BEGINPROC supR3HardenedEarlyProcessInitThunk
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52 | ;
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53 | ; Prologue.
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54 | ;
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55 |
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56 | ; Reserve space for the "return" address.
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57 | push 0
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58 |
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59 | ; Create a stack frame, saving xBP.
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60 | push xBP
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61 | SEH64_PUSH_xBP
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62 | mov xBP, xSP
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63 | SEH64_SET_FRAME_xBP 0 ; probably wrong...
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64 |
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65 | ; Save all volatile registers.
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66 | push xAX
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67 | push xCX
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68 | push xDX
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69 | %ifdef RT_ARCH_AMD64
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70 | push r8
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71 | push r9
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72 | push r10
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73 | push r11
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74 | %endif
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75 |
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76 | ; Reserve spill space and align the stack.
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77 | sub xSP, 20h
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78 | and xSP, ~0fh
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79 | SEH64_END_PROLOGUE
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80 |
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81 | ;
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82 | ; Call the C/C++ code that does the actual work. This returns the
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83 | ; resume address in xAX, which we put in the "return" stack position.
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84 | ;
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85 | call NAME(supR3HardenedEarlyProcessInit)
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86 | mov [xBP + xCB], xAX
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87 |
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88 | ;
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89 | ; Restore volatile registers.
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90 | ;
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91 | mov xAX, [xBP - xCB*1]
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92 | mov xCX, [xBP - xCB*2]
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93 | mov xDX, [xBP - xCB*3]
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94 | %ifdef RT_ARCH_AMD64
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95 | mov r8, [xBP - xCB*4]
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96 | mov r9, [xBP - xCB*5]
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97 | mov r10, [xBP - xCB*6]
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98 | mov r11, [xBP - xCB*7]
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99 | %endif
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100 | ;
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101 | ; Use the leave instruction to restore xBP and set up xSP to point at
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102 | ; the resume address. Then use the 'ret' instruction to resume process
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103 | ; initializaton.
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104 | ;
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105 | leave
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106 | ret
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107 | ENDPROC supR3HardenedEarlyProcessInitThunk
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108 |
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109 |
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110 |
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111 | ;;
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112 | ; Composes a standard call name.
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113 | %ifdef RT_ARCH_X86
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114 | %define SUPHNTIMP_STDCALL_NAME(a,b) _ %+ a %+ @ %+ b
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115 | %else
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116 | %define SUPHNTIMP_STDCALL_NAME(a,b) NAME(a)
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117 | %endif
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118 |
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119 | ;; Concats two litterals.
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120 | %define SUPHNTIMP_CONCAT(a,b) a %+ b
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121 |
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122 |
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123 | ;;
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124 | ; Import data and code for an API call.
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125 | ;
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126 | ; @param 1 The plain API name.
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127 | ; @param 2 The parameter frame size on x86. Multiple of dword.
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128 | ; @param 3 Non-zero expression if system call.
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129 | ; @param 4 Non-zero expression if early available call
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130 | ;
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131 | %define SUPHNTIMP_SYSCALL 1
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132 | %macro SupHardNtImport 4
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133 | ;
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134 | ; The data.
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135 | ;
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136 | BEGINDATA
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137 | global __imp_ %+ SUPHNTIMP_STDCALL_NAME(%1,%2) ; The import name used via dllimport.
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138 | __imp_ %+ SUPHNTIMP_STDCALL_NAME(%1,%2):
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139 | GLOBALNAME g_pfn %+ %1 ; The name we like to refer to.
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140 | RTCCPTR_DEF 0
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141 | %if %3
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142 | GLOBALNAME g_uApiNo %+ %1
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143 | RTCCPTR_DEF 0
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144 | %endif
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145 |
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146 | ;
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147 | ; The code: First a call stub.
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148 | ;
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149 | BEGINCODE
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150 | global SUPHNTIMP_STDCALL_NAME(%1, %2)
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151 | SUPHNTIMP_STDCALL_NAME(%1, %2):
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152 | jmp RTCCPTR_PRE [NAME(g_pfn %+ %1) xWrtRIP]
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153 |
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154 | %if %3
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155 | ;
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156 | ; Make system calls.
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157 | ;
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158 | %ifdef RT_ARCH_AMD64
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159 | BEGINPROC %1 %+ _SyscallType1
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160 | SEH64_END_PROLOGUE
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161 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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162 | mov r10, rcx
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163 | syscall
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164 | ret
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165 | ENDPROC %1 %+ _SyscallType1
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166 | BEGINPROC %1 %+ _SyscallType2 ; Introduced with build 10525
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167 | SEH64_END_PROLOGUE
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168 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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169 | test byte [07ffe0308h], 1 ; SharedUserData!Something
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170 | mov r10, rcx
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171 | jnz .int_alternative
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172 | syscall
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173 | ret
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174 | .int_alternative:
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175 | int 2eh
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176 | ret
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177 | ENDPROC %1 %+ _SyscallType2
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178 | %else
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179 | BEGINPROC %1 %+ _SyscallType1
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180 | mov edx, 07ffe0300h ; SharedUserData!SystemCallStub
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181 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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182 | call dword [edx]
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183 | ret %2
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184 | ENDPROC %1 %+ _SyscallType1
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185 | BEGINPROC %1 %+ _SyscallType2
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186 | push .return
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187 | mov edx, esp
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188 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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189 | sysenter
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190 | add esp, 4
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191 | .return:
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192 | ret %2
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193 | ENDPROC %1 %+ _SyscallType2
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194 | %endif
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195 | %endif
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196 |
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197 | %if %4 == 0
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198 | global NAME(SUPHNTIMP_CONCAT(%1,_Early))
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199 | NAME(SUPHNTIMP_CONCAT(%1,_Early)):
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200 | int3
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201 | %ifdef RT_ARCH_AMD64
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202 | ret
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203 | %else
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204 | ret %2
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205 | %endif
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206 | %endif
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207 | %endmacro
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208 |
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209 | %define SUPHARNT_COMMENT(a_Comment)
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210 | %define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, SUPHNTIMP_SYSCALL, 1
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211 | %define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, 0, 0
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212 | %define SUPHARNT_IMPORT_STDCALL_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86)
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213 | %define SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, 0, 1
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214 | %define SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86)
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215 | %include "import-template-ntdll.h"
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216 | %include "import-template-kernel32.h"
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217 |
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218 |
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219 | ;
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220 | ; For simplified LdrLoadDll patching we define a special writable, readable and
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221 | ; exectuable section of 4KB where we can put jump back code.
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222 | ;
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223 | section .rwxpg bss execute read write align=4096
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224 | GLOBALNAME g_abSupHardReadWriteExecPage
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225 | resb 4096
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226 |
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