1 | /* $Id: VBoxGuestR0LibGenericRequest.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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2 | /** @file
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3 | * VBoxGuestLibR0 - Generic VMMDev request management.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
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8 | *
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9 | * Permission is hereby granted, free of charge, to any person
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10 | * obtaining a copy of this software and associated documentation
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11 | * files (the "Software"), to deal in the Software without
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12 | * restriction, including without limitation the rights to use,
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13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 | * copies of the Software, and to permit persons to whom the
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15 | * Software is furnished to do so, subject to the following
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16 | * conditions:
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17 | *
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18 | * The above copyright notice and this permission notice shall be
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19 | * included in all copies or substantial portions of the Software.
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20 | *
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21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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28 | * OTHER DEALINGS IN THE SOFTWARE.
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29 | */
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30 |
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31 |
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32 | /*********************************************************************************************************************************
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33 | * Header Files *
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34 | *********************************************************************************************************************************/
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35 | #include "VBoxGuestR0LibInternal.h"
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36 | #include <iprt/asm.h>
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37 | #include <iprt/asm-amd64-x86.h>
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38 | #include <iprt/assert.h>
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39 | #include <iprt/string.h>
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40 | #include <VBox/err.h>
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41 |
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42 |
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43 | DECLR0VBGL(int) VbglGR0Verify(const VMMDevRequestHeader *pReq, size_t cbReq)
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44 | {
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45 | size_t cbReqExpected;
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46 |
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47 | if (RT_UNLIKELY(!pReq || cbReq < sizeof(VMMDevRequestHeader)))
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48 | {
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49 | dprintf(("VbglGR0Verify: Invalid parameter: pReq = %p, cbReq = %zu\n", pReq, cbReq));
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50 | return VERR_INVALID_PARAMETER;
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51 | }
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52 |
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53 | if (RT_UNLIKELY(pReq->size > cbReq))
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54 | {
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55 | dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
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56 | return VERR_INVALID_PARAMETER;
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57 | }
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58 |
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59 | /* The request size must correspond to the request type. */
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60 | cbReqExpected = vmmdevGetRequestSize(pReq->requestType);
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61 | if (RT_UNLIKELY(cbReq < cbReqExpected))
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62 | {
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63 | dprintf(("VbglGR0Verify: buffer size %zu < expected size %zu\n", cbReq, cbReqExpected));
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64 | return VERR_INVALID_PARAMETER;
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65 | }
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66 |
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67 | if (cbReqExpected == cbReq)
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68 | {
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69 | /*
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70 | * This is most likely a fixed size request, and in this case the
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71 | * request size must be also equal to the expected size.
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72 | */
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73 | if (RT_UNLIKELY(pReq->size != cbReqExpected))
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74 | {
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75 | dprintf(("VbglGR0Verify: request size %u != expected size %zu\n", pReq->size, cbReqExpected));
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76 | return VERR_INVALID_PARAMETER;
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77 | }
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78 |
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79 | return VINF_SUCCESS;
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80 | }
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81 |
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82 | /*
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83 | * This can be a variable size request. Check the request type and limit the size
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84 | * to VMMDEV_MAX_VMMDEVREQ_SIZE, which is max size supported by the host.
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85 | *
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86 | * Note: Keep this list sorted for easier human lookup!
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87 | */
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88 | if ( pReq->requestType == VMMDevReq_ChangeMemBalloon
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89 | || pReq->requestType == VMMDevReq_GetDisplayChangeRequestMulti
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90 | #ifdef VBOX_WITH_64_BITS_GUESTS
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91 | || pReq->requestType == VMMDevReq_HGCMCall64
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92 | #endif
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93 | || pReq->requestType == VMMDevReq_HGCMCall32
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94 | || pReq->requestType == VMMDevReq_RegisterSharedModule
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95 | || pReq->requestType == VMMDevReq_ReportGuestUserState
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96 | || pReq->requestType == VMMDevReq_LogString
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97 | || pReq->requestType == VMMDevReq_SetPointerShape
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98 | || pReq->requestType == VMMDevReq_VideoSetVisibleRegion
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99 | || pReq->requestType == VMMDevReq_VideoUpdateMonitorPositions)
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100 | {
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101 | if (RT_UNLIKELY(cbReq > VMMDEV_MAX_VMMDEVREQ_SIZE))
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102 | {
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103 | dprintf(("VbglGR0Verify: VMMDevReq_LogString: buffer size %zu too big\n", cbReq));
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104 | return VERR_BUFFER_OVERFLOW; /** @todo is this error code ok? */
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105 | }
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106 | }
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107 | else
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108 | {
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109 | dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
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110 | return VERR_IO_BAD_LENGTH; /** @todo is this error code ok? */
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111 | }
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112 |
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113 | return VINF_SUCCESS;
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114 | }
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115 |
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116 | DECLR0VBGL(int) VbglR0GRAlloc(VMMDevRequestHeader **ppReq, size_t cbReq, VMMDevRequestType enmReqType)
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117 | {
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118 | int rc = vbglR0Enter();
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119 | if (RT_SUCCESS(rc))
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120 | {
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121 | if ( ppReq
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122 | && cbReq >= sizeof(VMMDevRequestHeader)
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123 | && cbReq == (uint32_t)cbReq)
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124 | {
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125 | VMMDevRequestHeader *pReq = (VMMDevRequestHeader *)VbglR0PhysHeapAlloc((uint32_t)cbReq);
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126 | AssertMsgReturn(pReq, ("VbglR0GRAlloc: no memory (cbReq=%u)\n", cbReq), VERR_NO_MEMORY);
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127 | memset(pReq, 0xAA, cbReq);
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128 |
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129 | pReq->size = (uint32_t)cbReq;
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130 | pReq->version = VMMDEV_REQUEST_HEADER_VERSION;
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131 | pReq->requestType = enmReqType;
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132 | pReq->rc = VERR_GENERAL_FAILURE;
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133 | pReq->reserved1 = 0;
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134 | #ifdef VBGL_VBOXGUEST
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135 | pReq->fRequestor = VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV
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136 | #else
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137 | pReq->fRequestor = VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV_OTHER
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138 | #endif
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139 |
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140 | | VMMDEV_REQUESTOR_CON_DONT_KNOW | VMMDEV_REQUESTOR_TRUST_NOT_GIVEN;
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141 | *ppReq = pReq;
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142 | rc = VINF_SUCCESS;
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143 | }
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144 | else
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145 | {
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146 | dprintf(("VbglR0GRAlloc: Invalid parameter: ppReq=%p cbReq=%u\n", ppReq, cbReq));
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147 | rc = VERR_INVALID_PARAMETER;
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148 | }
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149 | }
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150 | return rc;
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151 | }
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152 |
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153 | DECLR0VBGL(int) VbglR0GRPerform(VMMDevRequestHeader *pReq)
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154 | {
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155 | int rc = vbglR0Enter();
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156 | if (RT_SUCCESS(rc))
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157 | {
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158 | if (pReq)
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159 | {
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160 | RTCCPHYS PhysAddr = VbglR0PhysHeapGetPhysAddr(pReq);
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161 | if ( PhysAddr != 0
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162 | && PhysAddr < _4G) /* Port IO is 32 bit. */
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163 | {
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164 | ASMOutU32(g_vbgldata.portVMMDev + VMMDEV_PORT_OFF_REQUEST, (uint32_t)PhysAddr);
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165 | /* Make the compiler aware that the host has changed memory. */
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166 | ASMCompilerBarrier();
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167 | rc = pReq->rc;
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168 | }
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169 | else
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170 | rc = VERR_VBGL_INVALID_ADDR;
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171 | }
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172 | else
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173 | rc = VERR_INVALID_PARAMETER;
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174 | }
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175 | return rc;
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176 | }
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177 |
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178 | DECLR0VBGL(void) VbglR0GRFree(VMMDevRequestHeader *pReq)
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179 | {
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180 | int rc = vbglR0Enter();
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181 | if (RT_SUCCESS(rc))
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182 | VbglR0PhysHeapFree(pReq);
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183 | }
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