VirtualBox

source: vbox/trunk/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibGenericRequest.cpp@ 96407

Last change on this file since 96407 was 96407, checked in by vboxsync, 2 years ago

scm copyright and license note update

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File size: 6.5 KB
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1/* $Id: VBoxGuestR0LibGenericRequest.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2/** @file
3 * VBoxGuestLibR0 - Generic VMMDev request management.
4 */
5
6/*
7 * Copyright (C) 2006-2022 Oracle and/or its affiliates.
8 *
9 * Permission is hereby granted, free of charge, to any person
10 * obtaining a copy of this software and associated documentation
11 * files (the "Software"), to deal in the Software without
12 * restriction, including without limitation the rights to use,
13 * copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following
16 * conditions:
17 *
18 * The above copyright notice and this permission notice shall be
19 * included in all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
23 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
29 */
30
31
32/*********************************************************************************************************************************
33* Header Files *
34*********************************************************************************************************************************/
35#include "VBoxGuestR0LibInternal.h"
36#include <iprt/asm.h>
37#include <iprt/asm-amd64-x86.h>
38#include <iprt/assert.h>
39#include <iprt/string.h>
40#include <VBox/err.h>
41
42
43DECLR0VBGL(int) VbglGR0Verify(const VMMDevRequestHeader *pReq, size_t cbReq)
44{
45 size_t cbReqExpected;
46
47 if (RT_UNLIKELY(!pReq || cbReq < sizeof(VMMDevRequestHeader)))
48 {
49 dprintf(("VbglGR0Verify: Invalid parameter: pReq = %p, cbReq = %zu\n", pReq, cbReq));
50 return VERR_INVALID_PARAMETER;
51 }
52
53 if (RT_UNLIKELY(pReq->size > cbReq))
54 {
55 dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
56 return VERR_INVALID_PARAMETER;
57 }
58
59 /* The request size must correspond to the request type. */
60 cbReqExpected = vmmdevGetRequestSize(pReq->requestType);
61 if (RT_UNLIKELY(cbReq < cbReqExpected))
62 {
63 dprintf(("VbglGR0Verify: buffer size %zu < expected size %zu\n", cbReq, cbReqExpected));
64 return VERR_INVALID_PARAMETER;
65 }
66
67 if (cbReqExpected == cbReq)
68 {
69 /*
70 * This is most likely a fixed size request, and in this case the
71 * request size must be also equal to the expected size.
72 */
73 if (RT_UNLIKELY(pReq->size != cbReqExpected))
74 {
75 dprintf(("VbglGR0Verify: request size %u != expected size %zu\n", pReq->size, cbReqExpected));
76 return VERR_INVALID_PARAMETER;
77 }
78
79 return VINF_SUCCESS;
80 }
81
82 /*
83 * This can be a variable size request. Check the request type and limit the size
84 * to VMMDEV_MAX_VMMDEVREQ_SIZE, which is max size supported by the host.
85 *
86 * Note: Keep this list sorted for easier human lookup!
87 */
88 if ( pReq->requestType == VMMDevReq_ChangeMemBalloon
89 || pReq->requestType == VMMDevReq_GetDisplayChangeRequestMulti
90#ifdef VBOX_WITH_64_BITS_GUESTS
91 || pReq->requestType == VMMDevReq_HGCMCall64
92#endif
93 || pReq->requestType == VMMDevReq_HGCMCall32
94 || pReq->requestType == VMMDevReq_RegisterSharedModule
95 || pReq->requestType == VMMDevReq_ReportGuestUserState
96 || pReq->requestType == VMMDevReq_LogString
97 || pReq->requestType == VMMDevReq_SetPointerShape
98 || pReq->requestType == VMMDevReq_VideoSetVisibleRegion
99 || pReq->requestType == VMMDevReq_VideoUpdateMonitorPositions)
100 {
101 if (RT_UNLIKELY(cbReq > VMMDEV_MAX_VMMDEVREQ_SIZE))
102 {
103 dprintf(("VbglGR0Verify: VMMDevReq_LogString: buffer size %zu too big\n", cbReq));
104 return VERR_BUFFER_OVERFLOW; /** @todo is this error code ok? */
105 }
106 }
107 else
108 {
109 dprintf(("VbglGR0Verify: request size %u > buffer size %zu\n", pReq->size, cbReq));
110 return VERR_IO_BAD_LENGTH; /** @todo is this error code ok? */
111 }
112
113 return VINF_SUCCESS;
114}
115
116DECLR0VBGL(int) VbglR0GRAlloc(VMMDevRequestHeader **ppReq, size_t cbReq, VMMDevRequestType enmReqType)
117{
118 int rc = vbglR0Enter();
119 if (RT_SUCCESS(rc))
120 {
121 if ( ppReq
122 && cbReq >= sizeof(VMMDevRequestHeader)
123 && cbReq == (uint32_t)cbReq)
124 {
125 VMMDevRequestHeader *pReq = (VMMDevRequestHeader *)VbglR0PhysHeapAlloc((uint32_t)cbReq);
126 AssertMsgReturn(pReq, ("VbglR0GRAlloc: no memory (cbReq=%u)\n", cbReq), VERR_NO_MEMORY);
127 memset(pReq, 0xAA, cbReq);
128
129 pReq->size = (uint32_t)cbReq;
130 pReq->version = VMMDEV_REQUEST_HEADER_VERSION;
131 pReq->requestType = enmReqType;
132 pReq->rc = VERR_GENERAL_FAILURE;
133 pReq->reserved1 = 0;
134#ifdef VBGL_VBOXGUEST
135 pReq->fRequestor = VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV
136#else
137 pReq->fRequestor = VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV_OTHER
138#endif
139
140 | VMMDEV_REQUESTOR_CON_DONT_KNOW | VMMDEV_REQUESTOR_TRUST_NOT_GIVEN;
141 *ppReq = pReq;
142 rc = VINF_SUCCESS;
143 }
144 else
145 {
146 dprintf(("VbglR0GRAlloc: Invalid parameter: ppReq=%p cbReq=%u\n", ppReq, cbReq));
147 rc = VERR_INVALID_PARAMETER;
148 }
149 }
150 return rc;
151}
152
153DECLR0VBGL(int) VbglR0GRPerform(VMMDevRequestHeader *pReq)
154{
155 int rc = vbglR0Enter();
156 if (RT_SUCCESS(rc))
157 {
158 if (pReq)
159 {
160 RTCCPHYS PhysAddr = VbglR0PhysHeapGetPhysAddr(pReq);
161 if ( PhysAddr != 0
162 && PhysAddr < _4G) /* Port IO is 32 bit. */
163 {
164 ASMOutU32(g_vbgldata.portVMMDev + VMMDEV_PORT_OFF_REQUEST, (uint32_t)PhysAddr);
165 /* Make the compiler aware that the host has changed memory. */
166 ASMCompilerBarrier();
167 rc = pReq->rc;
168 }
169 else
170 rc = VERR_VBGL_INVALID_ADDR;
171 }
172 else
173 rc = VERR_INVALID_PARAMETER;
174 }
175 return rc;
176}
177
178DECLR0VBGL(void) VbglR0GRFree(VMMDevRequestHeader *pReq)
179{
180 int rc = vbglR0Enter();
181 if (RT_SUCCESS(rc))
182 VbglR0PhysHeapFree(pReq);
183}
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