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1 | /* $Id: GenericRequest.cpp $ */ |
2 | /** @file | |
3 | * VBoxGuestLibR0 - Generic VMMDev request management. | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Copyright (C) 2006-2016 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 | * The contents of this file may alternatively be used under the terms | |
18 | * of the Common Development and Distribution License Version 1.0 | |
19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the | |
20 | * VirtualBox OSE distribution, in which case the provisions of the | |
21 | * CDDL are applicable instead of those of the GPL. | |
22 | * | |
23 | * You may elect to license modified versions of this file under the | |
24 | * terms and conditions of either the GPL or the CDDL or both. | |
25 | */ | |
26 | ||
27 | #include "VBGLInternal.h" | |
28 | #include <iprt/asm.h> | |
29 | #include <iprt/asm-amd64-x86.h> | |
30 | #include <iprt/assert.h> | |
31 | #include <iprt/string.h> | |
32 | ||
33 | ||
34 | DECLVBGL(int) VbglGRVerify(const VMMDevRequestHeader *pReq, size_t cbReq) | |
35 | { | |
36 | size_t cbReqExpected; | |
37 | ||
38 | if (RT_UNLIKELY(!pReq || cbReq < sizeof(VMMDevRequestHeader))) | |
39 | { | |
40 | dprintf(("VbglGRVerify: Invalid parameter: pReq = %p, cbReq = %zu\n", pReq, cbReq)); | |
41 | return VERR_INVALID_PARAMETER; | |
42 | } | |
43 | ||
44 | if (RT_UNLIKELY(pReq->size > cbReq)) | |
45 | { | |
46 | dprintf(("VbglGRVerify: request size %u > buffer size %zu\n", pReq->size, cbReq)); | |
47 | return VERR_INVALID_PARAMETER; | |
48 | } | |
49 | ||
50 | /* The request size must correspond to the request type. */ | |
51 | cbReqExpected = vmmdevGetRequestSize(pReq->requestType); | |
52 | if (RT_UNLIKELY(cbReq < cbReqExpected)) | |
53 | { | |
54 | dprintf(("VbglGRVerify: buffer size %zu < expected size %zu\n", cbReq, cbReqExpected)); | |
55 | return VERR_INVALID_PARAMETER; | |
56 | } | |
57 | ||
58 | if (cbReqExpected == cbReq) | |
59 | { | |
60 | /* | |
61 | * This is most likely a fixed size request, and in this case the | |
62 | * request size must be also equal to the expected size. | |
63 | */ | |
64 | if (RT_UNLIKELY(pReq->size != cbReqExpected)) | |
65 | { | |
66 | dprintf(("VbglGRVerify: request size %u != expected size %zu\n", pReq->size, cbReqExpected)); | |
67 | return VERR_INVALID_PARAMETER; | |
68 | } | |
69 | ||
70 | return VINF_SUCCESS; | |
71 | } | |
72 | ||
73 | /* | |
74 | * This can be a variable size request. Check the request type and limit the size | |
75 | * to VMMDEV_MAX_VMMDEVREQ_SIZE, which is max size supported by the host. | |
76 | * | |
77 | * Note: Keep this list sorted for easier human lookup! | |
78 | */ | |
79 | if ( pReq->requestType == VMMDevReq_ChangeMemBalloon | |
80 | #ifdef VBOX_WITH_64_BITS_GUESTS | |
81 | || pReq->requestType == VMMDevReq_HGCMCall32 | |
82 | || pReq->requestType == VMMDevReq_HGCMCall64 | |
83 | #else | |
84 | || pReq->requestType == VMMDevReq_HGCMCall | |
85 | #endif | |
86 | || pReq->requestType == VMMDevReq_RegisterSharedModule | |
87 | || pReq->requestType == VMMDevReq_ReportGuestUserState | |
88 | || pReq->requestType == VMMDevReq_LogString | |
89 | || pReq->requestType == VMMDevReq_SetPointerShape | |
90 | || pReq->requestType == VMMDevReq_VideoSetVisibleRegion) | |
91 | { | |
92 | if (RT_UNLIKELY(cbReq > VMMDEV_MAX_VMMDEVREQ_SIZE)) | |
93 | { | |
94 | dprintf(("VbglGRVerify: VMMDevReq_LogString: buffer size %zu too big\n", cbReq)); | |
95 | return VERR_BUFFER_OVERFLOW; /** @todo is this error code ok? */ | |
96 | } | |
97 | } | |
98 | else | |
99 | { | |
100 | dprintf(("VbglGRVerify: request size %u > buffer size %zu\n", pReq->size, cbReq)); | |
101 | return VERR_IO_BAD_LENGTH; /** @todo is this error code ok? */ | |
102 | } | |
103 | ||
104 | return VINF_SUCCESS; | |
105 | } | |
106 | ||
107 | DECLVBGL(int) VbglGRAlloc(VMMDevRequestHeader **ppReq, size_t cbReq, VMMDevRequestType enmReqType) | |
108 | { | |
109 | int rc = vbglR0Enter(); | |
110 | if (RT_SUCCESS(rc)) | |
111 | { | |
112 | if ( ppReq | |
113 | && cbReq >= sizeof(VMMDevRequestHeader) | |
114 | && cbReq == (uint32_t)cbReq) | |
115 | { | |
116 | VMMDevRequestHeader *pReq = (VMMDevRequestHeader *)VbglPhysHeapAlloc((uint32_t)cbReq); | |
117 | AssertMsgReturn(pReq, ("VbglGRAlloc: no memory (cbReq=%u)\n", cbReq), VERR_NO_MEMORY); | |
118 | memset(pReq, 0xAA, cbReq); | |
119 | ||
120 | pReq->size = (uint32_t)cbReq; | |
121 | pReq->version = VMMDEV_REQUEST_HEADER_VERSION; | |
122 | pReq->requestType = enmReqType; | |
123 | pReq->rc = VERR_GENERAL_FAILURE; | |
124 | pReq->reserved1 = 0; | |
125 | pReq->reserved2 = 0; | |
126 | ||
127 | *ppReq = pReq; | |
128 | rc = VINF_SUCCESS; | |
129 | } | |
130 | else | |
131 | { | |
132 | dprintf(("VbglGRAlloc: Invalid parameter: ppReq=%p cbReq=%u\n", ppReq, cbReq)); | |
133 | rc = VERR_INVALID_PARAMETER; | |
134 | } | |
135 | } | |
136 | return rc; | |
137 | } | |
138 | ||
139 | DECLVBGL(int) VbglGRPerform(VMMDevRequestHeader *pReq) | |
140 | { | |
141 | int rc = vbglR0Enter(); | |
142 | if (RT_SUCCESS(rc)) | |
143 | { | |
144 | if (pReq) | |
145 | { | |
146 | RTCCPHYS PhysAddr = VbglPhysHeapGetPhysAddr(pReq); | |
147 | if ( PhysAddr != 0 | |
148 | && PhysAddr < _4G) /* Port IO is 32 bit. */ | |
149 | { | |
150 | ASMOutU32(g_vbgldata.portVMMDev + VMMDEV_PORT_OFF_REQUEST, (uint32_t)PhysAddr); | |
151 | /* Make the compiler aware that the host has changed memory. */ | |
152 | ASMCompilerBarrier(); | |
153 | rc = pReq->rc; | |
154 | } | |
155 | else | |
156 | rc = VERR_VBGL_INVALID_ADDR; | |
157 | } | |
158 | else | |
159 | rc = VERR_INVALID_PARAMETER; | |
160 | } | |
161 | return rc; | |
162 | } | |
163 | ||
164 | DECLVBGL(void) VbglGRFree(VMMDevRequestHeader *pReq) | |
165 | { | |
166 | int rc = vbglR0Enter(); | |
167 | if (RT_SUCCESS(rc)) | |
168 | VbglPhysHeapFree(pReq); | |
169 | } | |
170 |