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1 | /** @file\r |
2 | Instance of MM memory check library.\r | |
3 | \r | |
4 | MM memory check library library implementation. This library consumes MM_ACCESS_PROTOCOL\r | |
5 | to get MMRAM information. In order to use this library instance, the platform should produce\r | |
6 | all MMRAM range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core\r | |
7 | and MM driver) and/or specific dedicated hardware.\r | |
8 | \r | |
9 | Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
10 | Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>\r | |
11 | \r | |
12 | This program and the accompanying materials\r | |
13 | are licensed and made available under the terms and conditions of the BSD License\r | |
14 | which accompanies this distribution. The full text of the license may be found at\r | |
15 | http://opensource.org/licenses/bsd-license.php\r | |
16 | \r | |
17 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
18 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
19 | \r | |
20 | **/\r | |
21 | \r | |
22 | \r | |
23 | #include <PiMm.h>\r | |
24 | \r | |
25 | #include <Library/BaseLib.h>\r | |
26 | #include <Library/BaseMemoryLib.h>\r | |
27 | #include <Library/DebugLib.h>\r | |
28 | \r | |
29 | EFI_MMRAM_DESCRIPTOR *mMmMemLibInternalMmramRanges;\r | |
30 | UINTN mMmMemLibInternalMmramCount;\r | |
31 | \r | |
32 | //\r | |
33 | // Maximum support address used to check input buffer\r | |
34 | //\r | |
35 | EFI_PHYSICAL_ADDRESS mMmMemLibInternalMaximumSupportAddress = 0;\r | |
36 | \r | |
37 | /**\r | |
38 | Calculate and save the maximum support address.\r | |
39 | \r | |
40 | **/\r | |
41 | VOID\r | |
42 | MmMemLibInternalCalculateMaximumSupportAddress (\r | |
43 | VOID\r | |
44 | );\r | |
45 | \r | |
46 | /**\r | |
47 | This function check if the buffer is valid per processor architecture and not overlap with MMRAM.\r | |
48 | \r | |
49 | @param Buffer The buffer start address to be checked.\r | |
50 | @param Length The buffer length to be checked.\r | |
51 | \r | |
52 | @retval TRUE This buffer is valid per processor architecture and not overlap with MMRAM.\r | |
53 | @retval FALSE This buffer is not valid per processor architecture or overlap with MMRAM.\r | |
54 | **/\r | |
55 | BOOLEAN\r | |
56 | EFIAPI\r | |
57 | MmIsBufferOutsideMmValid (\r | |
58 | IN EFI_PHYSICAL_ADDRESS Buffer,\r | |
59 | IN UINT64 Length\r | |
60 | )\r | |
61 | {\r | |
62 | UINTN Index;\r | |
63 | \r | |
64 | //\r | |
65 | // Check override.\r | |
66 | // NOTE: (B:0->L:4G) is invalid for IA32, but (B:1->L:4G-1)/(B:4G-1->L:1) is valid.\r | |
67 | //\r | |
68 | if ((Length > mMmMemLibInternalMaximumSupportAddress) ||\r | |
69 | (Buffer > mMmMemLibInternalMaximumSupportAddress) ||\r | |
70 | ((Length != 0) && (Buffer > (mMmMemLibInternalMaximumSupportAddress - (Length - 1)))) ) {\r | |
71 | //\r | |
72 | // Overflow happen\r | |
73 | //\r | |
74 | DEBUG ((\r | |
75 | DEBUG_ERROR,\r | |
76 | "MmIsBufferOutsideMmValid: Overflow: Buffer (0x%lx) - Length (0x%lx), MaximumSupportAddress (0x%lx)\n",\r | |
77 | Buffer,\r | |
78 | Length,\r | |
79 | mMmMemLibInternalMaximumSupportAddress\r | |
80 | ));\r | |
81 | return FALSE;\r | |
82 | }\r | |
83 | \r | |
84 | for (Index = 0; Index < mMmMemLibInternalMmramCount; Index ++) {\r | |
85 | if (((Buffer >= mMmMemLibInternalMmramRanges[Index].CpuStart) &&\r | |
86 | (Buffer < mMmMemLibInternalMmramRanges[Index].CpuStart + mMmMemLibInternalMmramRanges[Index].PhysicalSize)) ||\r | |
87 | ((mMmMemLibInternalMmramRanges[Index].CpuStart >= Buffer) &&\r | |
88 | (mMmMemLibInternalMmramRanges[Index].CpuStart < Buffer + Length))) {\r | |
89 | DEBUG ((\r | |
90 | DEBUG_ERROR,\r | |
91 | "MmIsBufferOutsideMmValid: Overlap: Buffer (0x%lx) - Length (0x%lx), ",\r | |
92 | Buffer,\r | |
93 | Length\r | |
94 | ));\r | |
95 | DEBUG ((\r | |
96 | DEBUG_ERROR,\r | |
97 | "CpuStart (0x%lx) - PhysicalSize (0x%lx)\n",\r | |
98 | mMmMemLibInternalMmramRanges[Index].CpuStart,\r | |
99 | mMmMemLibInternalMmramRanges[Index].PhysicalSize\r | |
100 | ));\r | |
101 | return FALSE;\r | |
102 | }\r | |
103 | }\r | |
104 | \r | |
105 | return TRUE;\r | |
106 | }\r | |
107 | \r | |
108 | /**\r | |
109 | Copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).\r | |
110 | \r | |
111 | This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).\r | |
112 | It checks if source buffer is valid per processor architecture and not overlap with MMRAM.\r | |
113 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
114 | If the check fails, it return EFI_SECURITY_VIOLATION.\r | |
115 | The implementation must be reentrant.\r | |
116 | \r | |
117 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r | |
118 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
119 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
120 | \r | |
121 | @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.\r | |
122 | @retval EFI_SUCCESS Memory is copied.\r | |
123 | \r | |
124 | **/\r | |
125 | EFI_STATUS\r | |
126 | EFIAPI\r | |
127 | MmCopyMemToMmram (\r | |
128 | OUT VOID *DestinationBuffer,\r | |
129 | IN CONST VOID *SourceBuffer,\r | |
130 | IN UINTN Length\r | |
131 | )\r | |
132 | {\r | |
133 | if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {\r | |
134 | DEBUG ((DEBUG_ERROR, "MmCopyMemToMmram: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));\r | |
135 | return EFI_SECURITY_VIOLATION;\r | |
136 | }\r | |
137 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
138 | return EFI_SUCCESS;\r | |
139 | }\r | |
140 | \r | |
141 | /**\r | |
142 | Copies a source buffer (MMRAM) to a destination buffer (NON-MMRAM).\r | |
143 | \r | |
144 | This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).\r | |
145 | It checks if destination buffer is valid per processor architecture and not overlap with MMRAM.\r | |
146 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
147 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
148 | The implementation must be reentrant.\r | |
149 | \r | |
150 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r | |
151 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
152 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
153 | \r | |
154 | @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.\r | |
155 | @retval EFI_SUCCESS Memory is copied.\r | |
156 | \r | |
157 | **/\r | |
158 | EFI_STATUS\r | |
159 | EFIAPI\r | |
160 | MmCopyMemFromMmram (\r | |
161 | OUT VOID *DestinationBuffer,\r | |
162 | IN CONST VOID *SourceBuffer,\r | |
163 | IN UINTN Length\r | |
164 | )\r | |
165 | {\r | |
166 | if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {\r | |
167 | DEBUG ((DEBUG_ERROR, "MmCopyMemFromMmram: Security Violation: Destination (0x%x), Length (0x%x)\n",\r | |
168 | DestinationBuffer, Length));\r | |
169 | return EFI_SECURITY_VIOLATION;\r | |
170 | }\r | |
171 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
172 | return EFI_SUCCESS;\r | |
173 | }\r | |
174 | \r | |
175 | /**\r | |
176 | Copies a source buffer (NON-MMRAM) to a destination buffer (NON-MMRAM).\r | |
177 | \r | |
178 | This function copies a source buffer (non-MMRAM) to a destination buffer (MMRAM).\r | |
179 | It checks if source buffer and destination buffer are valid per processor architecture and not overlap with MMRAM.\r | |
180 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
181 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
182 | The implementation must be reentrant, and it must handle the case where source buffer overlaps destination buffer.\r | |
183 | \r | |
184 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r | |
185 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
186 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
187 | \r | |
188 | @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with MMRAM.\r | |
189 | @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with MMRAM.\r | |
190 | @retval EFI_SUCCESS Memory is copied.\r | |
191 | \r | |
192 | **/\r | |
193 | EFI_STATUS\r | |
194 | EFIAPI\r | |
195 | MmCopyMem (\r | |
196 | OUT VOID *DestinationBuffer,\r | |
197 | IN CONST VOID *SourceBuffer,\r | |
198 | IN UINTN Length\r | |
199 | )\r | |
200 | {\r | |
201 | if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {\r | |
202 | DEBUG ((DEBUG_ERROR, "MmCopyMem: Security Violation: Destination (0x%x), Length (0x%x)\n",\r | |
203 | DestinationBuffer, Length));\r | |
204 | return EFI_SECURITY_VIOLATION;\r | |
205 | }\r | |
206 | if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {\r | |
207 | DEBUG ((DEBUG_ERROR, "MmCopyMem: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));\r | |
208 | return EFI_SECURITY_VIOLATION;\r | |
209 | }\r | |
210 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
211 | return EFI_SUCCESS;\r | |
212 | }\r | |
213 | \r | |
214 | /**\r | |
215 | Fills a target buffer (NON-MMRAM) with a byte value.\r | |
216 | \r | |
217 | This function fills a target buffer (non-MMRAM) with a byte value.\r | |
218 | It checks if target buffer is valid per processor architecture and not overlap with MMRAM.\r | |
219 | If the check passes, it fills memory and returns EFI_SUCCESS.\r | |
220 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
221 | \r | |
222 | @param Buffer The memory to set.\r | |
223 | @param Length The number of bytes to set.\r | |
224 | @param Value The value with which to fill Length bytes of Buffer.\r | |
225 | \r | |
226 | @retval EFI_SECURITY_VIOLATION The Buffer is invalid per processor architecture or overlap with MMRAM.\r | |
227 | @retval EFI_SUCCESS Memory is set.\r | |
228 | \r | |
229 | **/\r | |
230 | EFI_STATUS\r | |
231 | EFIAPI\r | |
232 | MmSetMem (\r | |
233 | OUT VOID *Buffer,\r | |
234 | IN UINTN Length,\r | |
235 | IN UINT8 Value\r | |
236 | )\r | |
237 | {\r | |
238 | if (!MmIsBufferOutsideMmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)Buffer, Length)) {\r | |
239 | DEBUG ((DEBUG_ERROR, "MmSetMem: Security Violation: Source (0x%x), Length (0x%x)\n", Buffer, Length));\r | |
240 | return EFI_SECURITY_VIOLATION;\r | |
241 | }\r | |
242 | SetMem (Buffer, Length, Value);\r | |
243 | return EFI_SUCCESS;\r | |
244 | }\r | |
245 | \r | |
246 | /**\r | |
247 | The constructor function initializes the Mm Mem library\r | |
248 | \r | |
249 | @param ImageHandle The firmware allocated handle for the EFI image.\r | |
250 | @param SystemTable A pointer to the EFI System Table.\r | |
251 | \r | |
252 | @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r | |
253 | \r | |
254 | **/\r | |
255 | EFI_STATUS\r | |
256 | EFIAPI\r | |
257 | MemLibConstructor (\r | |
258 | IN EFI_HANDLE ImageHandle,\r | |
259 | IN EFI_MM_SYSTEM_TABLE *MmSystemTable\r | |
260 | )\r | |
261 | {\r | |
262 | \r | |
263 | //\r | |
264 | // Calculate and save maximum support address\r | |
265 | //\r | |
266 | MmMemLibInternalCalculateMaximumSupportAddress ();\r | |
267 | \r | |
268 | return EFI_SUCCESS;\r | |
269 | }\r |