| 1 | ; $Id: SUPR3HardenedMainA-win.asm 82968 2020-02-04 10:35:17Z 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) 2012-2020 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 | extern NAME(supR3HardenedMonitor_KiUserApcDispatcher_C)
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| 37 | %ifndef VBOX_WITHOUT_HARDENDED_XCPT_LOGGING
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| 38 | extern NAME(supR3HardenedMonitor_KiUserExceptionDispatcher_C)
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| 39 | %endif
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| 40 |
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| 41 |
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| 42 | BEGINCODE
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| 43 |
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| 44 |
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| 45 | ;;
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| 46 | ; Alternative code for LdrInitializeThunk that performs the early process startup
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| 47 | ; for the Stub and VM processes.
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| 48 | ;
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| 49 | ; This does not concern itself with any arguments on stack or in registers that
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| 50 | ; may be passed to the LdrIntializeThunk routine as we just save and restore
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| 51 | ; them all before we restart the restored LdrInitializeThunk routine.
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| 52 | ;
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| 53 | ; @sa supR3HardenedEarlyProcessInit
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| 54 | ;
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| 55 | BEGINPROC supR3HardenedEarlyProcessInitThunk
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| 56 | ;
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| 57 | ; Prologue.
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| 58 | ;
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| 59 |
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| 60 | ; Reserve space for the "return" address.
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| 61 | push 0
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| 62 |
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| 63 | ; Create a stack frame, saving xBP.
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| 64 | push xBP
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| 65 | SEH64_PUSH_xBP
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| 66 | mov xBP, xSP
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| 67 | SEH64_SET_FRAME_xBP 0 ; probably wrong...
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| 68 |
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| 69 | ; Save all volatile registers.
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| 70 | push xAX
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| 71 | push xCX
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| 72 | push xDX
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| 73 | %ifdef RT_ARCH_AMD64
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| 74 | push r8
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| 75 | push r9
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| 76 | push r10
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| 77 | push r11
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| 78 | %endif
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| 79 |
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| 80 | ; Reserve spill space and align the stack.
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| 81 | sub xSP, 20h
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| 82 | and xSP, ~0fh
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| 83 | SEH64_END_PROLOGUE
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| 84 |
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| 85 | ;
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| 86 | ; Call the C/C++ code that does the actual work. This returns the
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| 87 | ; resume address in xAX, which we put in the "return" stack position.
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| 88 | ;
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| 89 | call NAME(supR3HardenedEarlyProcessInit)
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| 90 | mov [xBP + xCB], xAX
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| 91 |
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| 92 | ;
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| 93 | ; Restore volatile registers.
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| 94 | ;
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| 95 | mov xAX, [xBP - xCB*1]
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| 96 | mov xCX, [xBP - xCB*2]
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| 97 | mov xDX, [xBP - xCB*3]
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| 98 | %ifdef RT_ARCH_AMD64
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| 99 | mov r8, [xBP - xCB*4]
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| 100 | mov r9, [xBP - xCB*5]
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| 101 | mov r10, [xBP - xCB*6]
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| 102 | mov r11, [xBP - xCB*7]
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| 103 | %endif
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| 104 | ;
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| 105 | ; Use the leave instruction to restore xBP and set up xSP to point at
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| 106 | ; the resume address. Then use the 'ret' instruction to resume process
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| 107 | ; initializaton.
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| 108 | ;
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| 109 | leave
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| 110 | ret
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| 111 | ENDPROC supR3HardenedEarlyProcessInitThunk
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| 112 |
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| 113 |
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| 114 | ;;
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| 115 | ; Hook for KiUserApcDispatcher that validates user APC calls during early process
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| 116 | ; init to prevent calls going to or referring to executable memory we've freed
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| 117 | ; already.
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| 118 | ;
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| 119 | ; We just call C code here, just like supR3HardenedEarlyProcessInitThunk does.
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| 120 | ;
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| 121 | ; @sa supR3HardenedMonitor_KiUserApcDispatcher_C
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| 122 | ;
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| 123 | BEGINPROC supR3HardenedMonitor_KiUserApcDispatcher
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| 124 | ;
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| 125 | ; Prologue.
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| 126 | ;
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| 127 |
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| 128 | ; Reserve space for the "return" address.
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| 129 | push 0
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| 130 |
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| 131 | ; Create a stack frame, saving xBP.
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| 132 | push xBP
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| 133 | SEH64_PUSH_xBP
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| 134 | mov xBP, xSP
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| 135 | SEH64_SET_FRAME_xBP 0 ; probably wrong...
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| 136 |
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| 137 | ; Save all volatile registers.
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| 138 | push xAX
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| 139 | push xCX
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| 140 | push xDX
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| 141 | %ifdef RT_ARCH_AMD64
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| 142 | push r8
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| 143 | push r9
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| 144 | push r10
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| 145 | push r11
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| 146 | %endif
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| 147 |
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| 148 | ; Reserve spill space and align the stack.
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| 149 | sub xSP, 20h
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| 150 | and xSP, ~0fh
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| 151 | SEH64_END_PROLOGUE
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| 152 |
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| 153 | ;
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| 154 | ; Call the C/C++ code that does the actual work. This returns the
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| 155 | ; resume address in xAX, which we put in the "return" stack position.
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| 156 | ;
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| 157 | ; On AMD64, a CONTEXT structure is found at our RSP address when we're called.
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| 158 | ; On x86, there a 16 byte structure containing the two routines and their
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| 159 | ; arguments followed by a CONTEXT structure.
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| 160 | ;
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| 161 | lea xCX, [xBP + xCB + xCB]
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| 162 | %ifdef RT_ARCH_X86
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| 163 | mov [xSP], xCX
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| 164 | %endif
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| 165 | call NAME(supR3HardenedMonitor_KiUserApcDispatcher_C)
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| 166 | mov [xBP + xCB], xAX
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| 167 |
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| 168 | ;
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| 169 | ; Restore volatile registers.
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| 170 | ;
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| 171 | mov xAX, [xBP - xCB*1]
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| 172 | mov xCX, [xBP - xCB*2]
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| 173 | mov xDX, [xBP - xCB*3]
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| 174 | %ifdef RT_ARCH_AMD64
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| 175 | mov r8, [xBP - xCB*4]
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| 176 | mov r9, [xBP - xCB*5]
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| 177 | mov r10, [xBP - xCB*6]
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| 178 | mov r11, [xBP - xCB*7]
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| 179 | %endif
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| 180 | ;
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| 181 | ; Use the leave instruction to restore xBP and set up xSP to point at
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| 182 | ; the resume address. Then use the 'ret' instruction to execute the
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| 183 | ; original KiUserApcDispatcher code as if we've never been here...
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| 184 | ;
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| 185 | leave
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| 186 | ret
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| 187 | ENDPROC supR3HardenedMonitor_KiUserApcDispatcher
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| 188 |
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| 189 |
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| 190 | %ifndef VBOX_WITHOUT_HARDENDED_XCPT_LOGGING
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| 191 | ;;
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| 192 | ; Hook for KiUserExceptionDispatcher that logs exceptions.
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| 193 | ;
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| 194 | ; For the AMD64 variant, we're not directly intercepting the function itself, but
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| 195 | ; patching into a Wow64 callout that's done at the very start of the routine. RCX
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| 196 | ; and RDX are set to PEXCEPTION_RECORD and PCONTEXT respectively and there is a
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| 197 | ; return address. Also, we don't need to do any return-via-copied-out-code stuff.
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| 198 | ;
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| 199 | ; For X86 we hook the function and have PEXCEPTION_RECORD and PCONTEXT pointers on
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| 200 | ; the stack, but no return address.
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| 201 |
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| 202 | ; We just call C code here, just like supR3HardenedEarlyProcessInitThunk and
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| 203 | ; supR3HardenedMonitor_KiUserApcDispatcher does.
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| 204 | ;
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| 205 | ; @sa supR3HardenedMonitor_KiUserExceptionDispatcher_C
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| 206 | ;
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| 207 | BEGINPROC supR3HardenedMonitor_KiUserExceptionDispatcher
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| 208 | ;
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| 209 | ; Prologue.
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| 210 | ;
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| 211 |
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| 212 | %ifndef RT_ARCH_AMD64
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| 213 | ; Reserve space for the "return" address.
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| 214 | push 0
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| 215 | %endif
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| 216 |
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| 217 | ; Create a stack frame, saving xBP.
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| 218 | push xBP
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| 219 | SEH64_PUSH_xBP
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| 220 | mov xBP, xSP
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| 221 | SEH64_SET_FRAME_xBP 0 ; probably wrong...
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| 222 |
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| 223 | ; Save all volatile registers.
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| 224 | push xAX
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| 225 | push xCX
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| 226 | push xDX
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| 227 | %ifdef RT_ARCH_AMD64
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| 228 | push r8
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| 229 | push r9
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| 230 | push r10
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| 231 | push r11
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| 232 | %endif
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| 233 |
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| 234 | ; Reserve spill space and align the stack.
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| 235 | sub xSP, 20h
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| 236 | and xSP, ~0fh
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| 237 | SEH64_END_PROLOGUE
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| 238 |
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| 239 | ;
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| 240 | ; Call the C/C++ code that does the actual work. For x86 this returns
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| 241 | ; the resume address in xAX, which we put in the "return" stack position.
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| 242 | ;
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| 243 | ; On both AMD64 and X86 we have two parameters on the stack that we
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| 244 | ; passes along to the C code (see function description for details).
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| 245 | ;
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| 246 | %ifdef RT_ARCH_X86
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| 247 | mov xCX, [xBP + xCB*2]
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| 248 | mov xDX, [xBP + xCB*3]
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| 249 | mov [xSP], xCX
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| 250 | mov [xSP+4], xDX
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| 251 | %endif
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| 252 | call NAME(supR3HardenedMonitor_KiUserExceptionDispatcher_C)
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| 253 | %ifdef RT_ARCH_X86
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| 254 | mov [xBP + xCB], xAX
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| 255 | %endif
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| 256 |
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| 257 | ;
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| 258 | ; Restore volatile registers.
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| 259 | ;
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| 260 | mov xAX, [xBP - xCB*1]
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| 261 | mov xCX, [xBP - xCB*2]
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| 262 | mov xDX, [xBP - xCB*3]
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| 263 | %ifdef RT_ARCH_AMD64
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| 264 | mov r8, [xBP - xCB*4]
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| 265 | mov r9, [xBP - xCB*5]
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| 266 | mov r10, [xBP - xCB*6]
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| 267 | mov r11, [xBP - xCB*7]
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| 268 | %endif
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| 269 | ;
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| 270 | ; Use the leave instruction to restore xBP and set up xSP to point at
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| 271 | ; the resume address. Then use the 'ret' instruction to execute the
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| 272 | ; original KiUserExceptionDispatcher code as if we've never been here...
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| 273 | ;
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| 274 | leave
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| 275 | ret
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| 276 | ENDPROC supR3HardenedMonitor_KiUserExceptionDispatcher
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| 277 | %endif ; !VBOX_WITHOUT_HARDENDED_XCPT_LOGGING
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| 278 |
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| 279 | ;;
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| 280 | ; Composes a standard call name.
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| 281 | %ifdef RT_ARCH_X86
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| 282 | %define SUPHNTIMP_STDCALL_NAME(a,b) _ %+ a %+ @ %+ b
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| 283 | %else
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| 284 | %define SUPHNTIMP_STDCALL_NAME(a,b) NAME(a)
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| 285 | %endif
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| 286 |
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| 287 | ;; Concats two litterals.
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| 288 | %define SUPHNTIMP_CONCAT(a,b) a %+ b
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| 289 |
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| 290 |
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| 291 | ;;
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| 292 | ; Import data and code for an API call.
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| 293 | ;
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| 294 | ; @param 1 The plain API name.
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| 295 | ; @param 2 The parameter frame size on x86. Multiple of dword.
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| 296 | ; @param 3 Non-zero expression if system call.
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| 297 | ; @param 4 Non-zero expression if early available call
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| 298 | ;
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| 299 | %define SUPHNTIMP_SYSCALL 1
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| 300 | %macro SupHardNtImport 4
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| 301 | ;
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| 302 | ; The data.
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| 303 | ;
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| 304 | BEGINDATA
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| 305 | global __imp_ %+ SUPHNTIMP_STDCALL_NAME(%1,%2) ; The import name used via dllimport.
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| 306 | __imp_ %+ SUPHNTIMP_STDCALL_NAME(%1,%2):
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| 307 | GLOBALNAME g_pfn %+ %1 ; The name we like to refer to.
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| 308 | RTCCPTR_DEF 0
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| 309 | %if %3
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| 310 | GLOBALNAME g_uApiNo %+ %1
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| 311 | RTCCPTR_DEF 0
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| 312 | %endif
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| 313 |
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| 314 | ;
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| 315 | ; The code: First a call stub.
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| 316 | ;
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| 317 | BEGINCODE
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| 318 | global SUPHNTIMP_STDCALL_NAME(%1, %2)
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| 319 | SUPHNTIMP_STDCALL_NAME(%1, %2):
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| 320 | jmp RTCCPTR_PRE [NAME(g_pfn %+ %1) xWrtRIP]
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| 321 |
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| 322 | %if %3
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| 323 | ;
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| 324 | ; Make system calls.
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| 325 | ;
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| 326 | %ifdef RT_ARCH_AMD64
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| 327 | BEGINPROC %1 %+ _SyscallType1
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| 328 | SEH64_END_PROLOGUE
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| 329 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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| 330 | mov r10, rcx
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| 331 | syscall
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| 332 | ret
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| 333 | ENDPROC %1 %+ _SyscallType1
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| 334 | BEGINPROC %1 %+ _SyscallType2 ; Introduced with build 10525
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| 335 | SEH64_END_PROLOGUE
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| 336 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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| 337 | test byte [07ffe0308h], 1 ; SharedUserData!Something
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| 338 | mov r10, rcx
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| 339 | jnz .int_alternative
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| 340 | syscall
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| 341 | ret
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| 342 | .int_alternative:
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| 343 | int 2eh
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| 344 | ret
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| 345 | ENDPROC %1 %+ _SyscallType2
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| 346 | %else
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| 347 | BEGINPROC %1 %+ _SyscallType1
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| 348 | mov edx, 07ffe0300h ; SharedUserData!SystemCallStub
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| 349 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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| 350 | call dword [edx]
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| 351 | ret %2
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| 352 | ENDPROC %1 %+ _SyscallType1
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| 353 | BEGINPROC %1 %+ _SyscallType2
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| 354 | push .return
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| 355 | mov edx, esp
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| 356 | mov eax, [NAME(g_uApiNo %+ %1) xWrtRIP]
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| 357 | sysenter
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| 358 | add esp, 4
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| 359 | .return:
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| 360 | ret %2
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| 361 | ENDPROC %1 %+ _SyscallType2
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| 362 | %endif
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| 363 | %endif
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| 364 |
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| 365 | %if %4 == 0
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| 366 | global NAME(SUPHNTIMP_CONCAT(%1,_Early))
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| 367 | NAME(SUPHNTIMP_CONCAT(%1,_Early)):
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| 368 | int3
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| 369 | %ifdef RT_ARCH_AMD64
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| 370 | ret
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| 371 | %else
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| 372 | ret %2
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| 373 | %endif
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| 374 | %endif
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| 375 | %endmacro
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| 376 |
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| 377 | %define SUPHARNT_COMMENT(a_Comment)
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| 378 | %define SUPHARNT_IMPORT_SYSCALL(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, SUPHNTIMP_SYSCALL, 1
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| 379 | %define SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, 0, 0
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| 380 | %define SUPHARNT_IMPORT_STDCALL_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL(a_Name, a_cbParamsX86)
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| 381 | %define SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86) SupHardNtImport a_Name, a_cbParamsX86, 0, 1
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| 382 | %define SUPHARNT_IMPORT_STDCALL_EARLY_OPTIONAL(a_Name, a_cbParamsX86) SUPHARNT_IMPORT_STDCALL_EARLY(a_Name, a_cbParamsX86)
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| 383 | %include "import-template-ntdll.h"
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| 384 | %include "import-template-kernel32.h"
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| 385 |
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| 386 |
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| 387 | ;
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| 388 | ; For simplified LdrLoadDll patching we define a special writable, readable and
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| 389 | ; exectuable section of 4KB where we can put jump back code.
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| 390 | ;
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| 391 | section .rwxpg bss execute read write align=4096
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| 392 | GLOBALNAME g_abSupHardReadWriteExecPage
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| 393 | resb 4096
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| 394 |
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