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Commit | Line | Data |
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abad83e6 JY |
1 | /** @file\r |
2 | TCG MOR (Memory Overwrite Request) Lock Control support (SMM version).\r | |
3 | \r | |
4 | This module initilizes MemoryOverwriteRequestControlLock variable.\r | |
5 | This module adds Variable Hook and check MemoryOverwriteRequestControlLock.\r | |
6 | \r | |
5da2c9b2 | 7 | Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>\r |
e176bafc | 8 | Copyright (c) Microsoft Corporation.\r |
9d510e61 | 9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
abad83e6 JY |
10 | \r |
11 | **/\r | |
12 | \r | |
13 | #include <PiDxe.h>\r | |
14 | #include <Guid/MemoryOverwriteControl.h>\r | |
15 | #include <IndustryStandard/MemoryOverwriteRequestControlLock.h>\r | |
16 | #include <Library/DebugLib.h>\r | |
17 | #include <Library/BaseLib.h>\r | |
18 | #include <Library/BaseMemoryLib.h>\r | |
19 | #include "Variable.h"\r | |
20 | \r | |
e176bafc | 21 | #include <Protocol/VariablePolicy.h>\r |
98ee0c68 | 22 | #include <Library/VariablePolicyHelperLib.h>\r |
e176bafc BB |
23 | #include <Library/VariablePolicyLib.h>\r |
24 | \r | |
abad83e6 | 25 | typedef struct {\r |
1436aea4 MK |
26 | CHAR16 *VariableName;\r |
27 | EFI_GUID *VendorGuid;\r | |
abad83e6 JY |
28 | } VARIABLE_TYPE;\r |
29 | \r | |
30 | VARIABLE_TYPE mMorVariableType[] = {\r | |
1436aea4 MK |
31 | { MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME, &gEfiMemoryOverwriteControlDataGuid },\r |
32 | { MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME, &gEfiMemoryOverwriteRequestControlLockGuid },\r | |
abad83e6 JY |
33 | };\r |
34 | \r | |
1436aea4 | 35 | BOOLEAN mMorPassThru = FALSE;\r |
fda8f631 | 36 | \r |
1436aea4 MK |
37 | #define MOR_LOCK_DATA_UNLOCKED 0x0\r |
38 | #define MOR_LOCK_DATA_LOCKED_WITHOUT_KEY 0x1\r | |
39 | #define MOR_LOCK_DATA_LOCKED_WITH_KEY 0x2\r | |
abad83e6 JY |
40 | \r |
41 | #define MOR_LOCK_V1_SIZE 1\r | |
42 | #define MOR_LOCK_V2_KEY_SIZE 8\r | |
43 | \r | |
44 | typedef enum {\r | |
45 | MorLockStateUnlocked = 0,\r | |
1436aea4 | 46 | MorLockStateLocked = 1,\r |
abad83e6 JY |
47 | } MOR_LOCK_STATE;\r |
48 | \r | |
7516532f | 49 | BOOLEAN mMorLockInitializationRequired = FALSE;\r |
abad83e6 JY |
50 | UINT8 mMorLockKey[MOR_LOCK_V2_KEY_SIZE];\r |
51 | BOOLEAN mMorLockKeyEmpty = TRUE;\r | |
52 | BOOLEAN mMorLockPassThru = FALSE;\r | |
1436aea4 | 53 | MOR_LOCK_STATE mMorLockState = MorLockStateUnlocked;\r |
abad83e6 JY |
54 | \r |
55 | /**\r | |
56 | Returns if this is MOR related variable.\r | |
57 | \r | |
58 | @param VariableName the name of the vendor's variable, it's a Null-Terminated Unicode String\r | |
59 | @param VendorGuid Unify identifier for vendor.\r | |
60 | \r | |
61 | @retval TRUE The variable is MOR related.\r | |
62 | @retval FALSE The variable is NOT MOR related.\r | |
63 | **/\r | |
64 | BOOLEAN\r | |
65 | IsAnyMorVariable (\r | |
1436aea4 MK |
66 | IN CHAR16 *VariableName,\r |
67 | IN EFI_GUID *VendorGuid\r | |
abad83e6 JY |
68 | )\r |
69 | {\r | |
1436aea4 | 70 | UINTN Index;\r |
abad83e6 | 71 | \r |
1436aea4 | 72 | for (Index = 0; Index < sizeof (mMorVariableType)/sizeof (mMorVariableType[0]); Index++) {\r |
abad83e6 | 73 | if ((StrCmp (VariableName, mMorVariableType[Index].VariableName) == 0) &&\r |
1436aea4 MK |
74 | (CompareGuid (VendorGuid, mMorVariableType[Index].VendorGuid)))\r |
75 | {\r | |
abad83e6 JY |
76 | return TRUE;\r |
77 | }\r | |
78 | }\r | |
1436aea4 | 79 | \r |
abad83e6 JY |
80 | return FALSE;\r |
81 | }\r | |
82 | \r | |
83 | /**\r | |
84 | Returns if this is MOR lock variable.\r | |
85 | \r | |
86 | @param VariableName the name of the vendor's variable, it's a Null-Terminated Unicode String\r | |
87 | @param VendorGuid Unify identifier for vendor.\r | |
88 | \r | |
89 | @retval TRUE The variable is MOR lock variable.\r | |
90 | @retval FALSE The variable is NOT MOR lock variable.\r | |
91 | **/\r | |
92 | BOOLEAN\r | |
93 | IsMorLockVariable (\r | |
1436aea4 MK |
94 | IN CHAR16 *VariableName,\r |
95 | IN EFI_GUID *VendorGuid\r | |
abad83e6 JY |
96 | )\r |
97 | {\r | |
98 | if ((StrCmp (VariableName, MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME) == 0) &&\r | |
1436aea4 MK |
99 | (CompareGuid (VendorGuid, &gEfiMemoryOverwriteRequestControlLockGuid)))\r |
100 | {\r | |
abad83e6 JY |
101 | return TRUE;\r |
102 | }\r | |
1436aea4 | 103 | \r |
abad83e6 JY |
104 | return FALSE;\r |
105 | }\r | |
106 | \r | |
107 | /**\r | |
108 | Set MOR lock variable.\r | |
109 | \r | |
110 | @param Data MOR Lock variable data.\r | |
111 | \r | |
112 | @retval EFI_SUCCESS The firmware has successfully stored the variable and its data as\r | |
113 | defined by the Attributes.\r | |
114 | @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the\r | |
115 | DataSize exceeds the maximum allowed.\r | |
116 | @retval EFI_INVALID_PARAMETER VariableName is an empty Unicode string.\r | |
117 | @retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.\r | |
118 | @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.\r | |
119 | @retval EFI_WRITE_PROTECTED The variable in question is read-only.\r | |
120 | @retval EFI_WRITE_PROTECTED The variable in question cannot be deleted.\r | |
4073f85d | 121 | @retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\r |
abad83e6 JY |
122 | set but the AuthInfo does NOT pass the validation check carried\r |
123 | out by the firmware.\r | |
124 | @retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.\r | |
125 | **/\r | |
126 | EFI_STATUS\r | |
127 | SetMorLockVariable (\r | |
128 | IN UINT8 Data\r | |
129 | )\r | |
130 | {\r | |
131 | EFI_STATUS Status;\r | |
132 | \r | |
133 | mMorLockPassThru = TRUE;\r | |
1436aea4 MK |
134 | Status = VariableServiceSetVariable (\r |
135 | MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME,\r | |
136 | &gEfiMemoryOverwriteRequestControlLockGuid,\r | |
137 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
138 | sizeof (Data),\r | |
139 | &Data\r | |
140 | );\r | |
abad83e6 JY |
141 | mMorLockPassThru = FALSE;\r |
142 | return Status;\r | |
143 | }\r | |
144 | \r | |
145 | /**\r | |
146 | This service is an MorLock checker handler for the SetVariable().\r | |
147 | \r | |
148 | @param VariableName the name of the vendor's variable, as a\r | |
149 | Null-Terminated Unicode String\r | |
150 | @param VendorGuid Unify identifier for vendor.\r | |
151 | @param Attributes Point to memory location to return the attributes of variable. If the point\r | |
152 | is NULL, the parameter would be ignored.\r | |
153 | @param DataSize The size in bytes of Data-Buffer.\r | |
154 | @param Data Point to the content of the variable.\r | |
155 | \r | |
156 | @retval EFI_SUCCESS The MorLock check pass, and Variable driver can store the variable data.\r | |
157 | @retval EFI_INVALID_PARAMETER The MorLock data or data size or attributes is not allowed.\r | |
158 | @retval EFI_ACCESS_DENIED The MorLock is locked.\r | |
159 | @retval EFI_WRITE_PROTECTED The MorLock deletion is not allowed.\r | |
160 | @retval EFI_ALREADY_STARTED The MorLock variable is handled inside this function.\r | |
161 | Variable driver can just return EFI_SUCCESS.\r | |
162 | **/\r | |
163 | EFI_STATUS\r | |
164 | SetVariableCheckHandlerMorLock (\r | |
1436aea4 MK |
165 | IN CHAR16 *VariableName,\r |
166 | IN EFI_GUID *VendorGuid,\r | |
167 | IN UINT32 Attributes,\r | |
168 | IN UINTN DataSize,\r | |
169 | IN VOID *Data\r | |
abad83e6 JY |
170 | )\r |
171 | {\r | |
172 | EFI_STATUS Status;\r | |
173 | \r | |
174 | //\r | |
175 | // Basic Check\r | |
176 | //\r | |
1436aea4 | 177 | if ((Attributes == 0) || (DataSize == 0) || (Data == NULL)) {\r |
e3531164 LE |
178 | //\r |
179 | // Permit deletion for passthru request, deny it otherwise.\r | |
180 | //\r | |
181 | return mMorLockPassThru ? EFI_SUCCESS : EFI_WRITE_PROTECTED;\r | |
abad83e6 JY |
182 | }\r |
183 | \r | |
184 | if ((Attributes != (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS)) ||\r | |
1436aea4 MK |
185 | ((DataSize != MOR_LOCK_V1_SIZE) && (DataSize != MOR_LOCK_V2_KEY_SIZE)))\r |
186 | {\r | |
abad83e6 JY |
187 | return EFI_INVALID_PARAMETER;\r |
188 | }\r | |
189 | \r | |
190 | //\r | |
191 | // Do not check if the request is passthru.\r | |
192 | //\r | |
193 | if (mMorLockPassThru) {\r | |
194 | return EFI_SUCCESS;\r | |
195 | }\r | |
196 | \r | |
197 | if (mMorLockState == MorLockStateUnlocked) {\r | |
198 | //\r | |
199 | // In Unlocked State\r | |
200 | //\r | |
201 | if (DataSize == MOR_LOCK_V1_SIZE) {\r | |
202 | //\r | |
0a18956d | 203 | // V1 - lock permanently\r |
abad83e6 JY |
204 | //\r |
205 | if (*(UINT8 *)Data == MOR_LOCK_DATA_UNLOCKED) {\r | |
206 | //\r | |
207 | // Unlock\r | |
208 | //\r | |
209 | Status = SetMorLockVariable (MOR_LOCK_DATA_UNLOCKED);\r | |
210 | if (!EFI_ERROR (Status)) {\r | |
211 | //\r | |
212 | // return EFI_ALREADY_STARTED to skip variable set.\r | |
213 | //\r | |
214 | return EFI_ALREADY_STARTED;\r | |
215 | } else {\r | |
216 | //\r | |
217 | // SetVar fail\r | |
218 | //\r | |
219 | return Status;\r | |
220 | }\r | |
221 | } else if (*(UINT8 *)Data == MOR_LOCK_DATA_LOCKED_WITHOUT_KEY) {\r | |
222 | //\r | |
223 | // Lock without key\r | |
224 | //\r | |
225 | Status = SetMorLockVariable (MOR_LOCK_DATA_LOCKED_WITHOUT_KEY);\r | |
226 | if (!EFI_ERROR (Status)) {\r | |
227 | //\r | |
228 | // Lock success\r | |
229 | //\r | |
230 | mMorLockState = MorLockStateLocked;\r | |
231 | //\r | |
232 | // return EFI_ALREADY_STARTED to skip variable set.\r | |
233 | //\r | |
234 | return EFI_ALREADY_STARTED;\r | |
235 | } else {\r | |
236 | //\r | |
237 | // SetVar fail\r | |
238 | //\r | |
239 | return Status;\r | |
240 | }\r | |
241 | } else {\r | |
242 | return EFI_INVALID_PARAMETER;\r | |
243 | }\r | |
244 | } else if (DataSize == MOR_LOCK_V2_KEY_SIZE) {\r | |
245 | //\r | |
246 | // V2 lock and provision the key\r | |
247 | //\r | |
248 | \r | |
249 | //\r | |
250 | // Need set here because the data value on flash is different\r | |
251 | //\r | |
252 | Status = SetMorLockVariable (MOR_LOCK_DATA_LOCKED_WITH_KEY);\r | |
1436aea4 | 253 | if (EFI_ERROR (Status)) {\r |
abad83e6 JY |
254 | //\r |
255 | // SetVar fail, do not provision the key\r | |
256 | //\r | |
257 | return Status;\r | |
258 | } else {\r | |
259 | //\r | |
260 | // Lock success, provision the key\r | |
261 | //\r | |
262 | mMorLockKeyEmpty = FALSE;\r | |
263 | CopyMem (mMorLockKey, Data, MOR_LOCK_V2_KEY_SIZE);\r | |
264 | mMorLockState = MorLockStateLocked;\r | |
265 | //\r | |
266 | // return EFI_ALREADY_STARTED to skip variable set.\r | |
267 | //\r | |
268 | return EFI_ALREADY_STARTED;\r | |
269 | }\r | |
270 | } else {\r | |
271 | ASSERT (FALSE);\r | |
272 | return EFI_OUT_OF_RESOURCES;\r | |
273 | }\r | |
274 | } else {\r | |
275 | //\r | |
276 | // In Locked State\r | |
277 | //\r | |
278 | if (mMorLockKeyEmpty || (DataSize != MOR_LOCK_V2_KEY_SIZE)) {\r | |
279 | return EFI_ACCESS_DENIED;\r | |
280 | }\r | |
1436aea4 | 281 | \r |
abad83e6 JY |
282 | if ((CompareMem (Data, mMorLockKey, MOR_LOCK_V2_KEY_SIZE) == 0)) {\r |
283 | //\r | |
284 | // Key match - unlock\r | |
285 | //\r | |
286 | \r | |
287 | //\r | |
288 | // Need set here because the data value on flash is different\r | |
289 | //\r | |
290 | Status = SetMorLockVariable (MOR_LOCK_DATA_UNLOCKED);\r | |
291 | if (EFI_ERROR (Status)) {\r | |
292 | //\r | |
293 | // SetVar fail\r | |
294 | //\r | |
295 | return Status;\r | |
296 | } else {\r | |
297 | //\r | |
298 | // Unlock Success\r | |
299 | //\r | |
1436aea4 | 300 | mMorLockState = MorLockStateUnlocked;\r |
abad83e6 | 301 | mMorLockKeyEmpty = TRUE;\r |
1436aea4 | 302 | ZeroMem (mMorLockKey, sizeof (mMorLockKey));\r |
abad83e6 JY |
303 | //\r |
304 | // return EFI_ALREADY_STARTED to skip variable set.\r | |
305 | //\r | |
306 | return EFI_ALREADY_STARTED;\r | |
307 | }\r | |
308 | } else {\r | |
309 | //\r | |
310 | // Key mismatch - Prevent Dictionary Attack\r | |
311 | //\r | |
1436aea4 | 312 | mMorLockState = MorLockStateLocked;\r |
abad83e6 | 313 | mMorLockKeyEmpty = TRUE;\r |
1436aea4 | 314 | ZeroMem (mMorLockKey, sizeof (mMorLockKey));\r |
abad83e6 JY |
315 | return EFI_ACCESS_DENIED;\r |
316 | }\r | |
317 | }\r | |
318 | }\r | |
319 | \r | |
320 | /**\r | |
321 | This service is an MOR/MorLock checker handler for the SetVariable().\r | |
322 | \r | |
03877377 LE |
323 | @param[in] VariableName the name of the vendor's variable, as a\r |
324 | Null-Terminated Unicode String\r | |
325 | @param[in] VendorGuid Unify identifier for vendor.\r | |
326 | @param[in] Attributes Attributes bitmask to set for the variable.\r | |
327 | @param[in] DataSize The size in bytes of Data-Buffer.\r | |
328 | @param[in] Data Point to the content of the variable.\r | |
329 | \r | |
330 | @retval EFI_SUCCESS The MOR/MorLock check pass, and Variable\r | |
331 | driver can store the variable data.\r | |
332 | @retval EFI_INVALID_PARAMETER The MOR/MorLock data or data size or\r | |
333 | attributes is not allowed for MOR variable.\r | |
abad83e6 | 334 | @retval EFI_ACCESS_DENIED The MOR/MorLock is locked.\r |
03877377 LE |
335 | @retval EFI_ALREADY_STARTED The MorLock variable is handled inside this\r |
336 | function. Variable driver can just return\r | |
337 | EFI_SUCCESS.\r | |
abad83e6 JY |
338 | **/\r |
339 | EFI_STATUS\r | |
340 | SetVariableCheckHandlerMor (\r | |
1436aea4 MK |
341 | IN CHAR16 *VariableName,\r |
342 | IN EFI_GUID *VendorGuid,\r | |
343 | IN UINT32 Attributes,\r | |
344 | IN UINTN DataSize,\r | |
345 | IN VOID *Data\r | |
abad83e6 JY |
346 | )\r |
347 | {\r | |
348 | //\r | |
349 | // do not handle non-MOR variable\r | |
350 | //\r | |
351 | if (!IsAnyMorVariable (VariableName, VendorGuid)) {\r | |
352 | return EFI_SUCCESS;\r | |
353 | }\r | |
354 | \r | |
e176bafc | 355 | // Permit deletion when policy is disabled.\r |
1436aea4 | 356 | if (!IsVariablePolicyEnabled () && ((Attributes == 0) || (DataSize == 0))) {\r |
e176bafc BB |
357 | return EFI_SUCCESS;\r |
358 | }\r | |
359 | \r | |
abad83e6 JY |
360 | //\r |
361 | // MorLock variable\r | |
362 | //\r | |
363 | if (IsMorLockVariable (VariableName, VendorGuid)) {\r | |
364 | return SetVariableCheckHandlerMorLock (\r | |
365 | VariableName,\r | |
366 | VendorGuid,\r | |
367 | Attributes,\r | |
368 | DataSize,\r | |
369 | Data\r | |
370 | );\r | |
371 | }\r | |
372 | \r | |
373 | //\r | |
374 | // Mor Variable\r | |
375 | //\r | |
376 | \r | |
fda8f631 LE |
377 | //\r |
378 | // Permit deletion for passthru request.\r | |
379 | //\r | |
380 | if (((Attributes == 0) || (DataSize == 0)) && mMorPassThru) {\r | |
381 | return EFI_SUCCESS;\r | |
382 | }\r | |
383 | \r | |
abad83e6 JY |
384 | //\r |
385 | // Basic Check\r | |
386 | //\r | |
387 | if ((Attributes != (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS)) ||\r | |
1436aea4 MK |
388 | (DataSize != sizeof (UINT8)) ||\r |
389 | (Data == NULL))\r | |
390 | {\r | |
abad83e6 JY |
391 | return EFI_INVALID_PARAMETER;\r |
392 | }\r | |
1436aea4 | 393 | \r |
abad83e6 JY |
394 | if (mMorLockState == MorLockStateLocked) {\r |
395 | //\r | |
396 | // If lock, deny access\r | |
397 | //\r | |
398 | return EFI_ACCESS_DENIED;\r | |
399 | }\r | |
1436aea4 | 400 | \r |
abad83e6 JY |
401 | //\r |
402 | // grant access\r | |
403 | //\r | |
404 | return EFI_SUCCESS;\r | |
405 | }\r | |
406 | \r | |
407 | /**\r | |
03877377 | 408 | Initialization for MOR Control Lock.\r |
abad83e6 | 409 | \r |
03877377 | 410 | @retval EFI_SUCCESS MorLock initialization success.\r |
abad83e6 JY |
411 | @return Others Some error occurs.\r |
412 | **/\r | |
413 | EFI_STATUS\r | |
414 | MorLockInit (\r | |
415 | VOID\r | |
416 | )\r | |
417 | {\r | |
7516532f LE |
418 | mMorLockInitializationRequired = TRUE;\r |
419 | return EFI_SUCCESS;\r | |
abad83e6 | 420 | }\r |
f1304280 LE |
421 | \r |
422 | /**\r | |
423 | Delayed initialization for MOR Control Lock at EndOfDxe.\r | |
424 | \r | |
425 | This function performs any operations queued by MorLockInit().\r | |
426 | **/\r | |
427 | VOID\r | |
428 | MorLockInitAtEndOfDxe (\r | |
429 | VOID\r | |
430 | )\r | |
431 | {\r | |
1436aea4 MK |
432 | UINTN MorSize;\r |
433 | EFI_STATUS MorStatus;\r | |
434 | EFI_STATUS Status;\r | |
435 | VARIABLE_POLICY_ENTRY *NewPolicy;\r | |
7516532f LE |
436 | \r |
437 | if (!mMorLockInitializationRequired) {\r | |
438 | //\r | |
439 | // The EFI_SMM_FAULT_TOLERANT_WRITE_PROTOCOL has never been installed, thus\r | |
440 | // the variable write service is unavailable. This should never happen.\r | |
441 | //\r | |
442 | ASSERT (FALSE);\r | |
443 | return;\r | |
444 | }\r | |
445 | \r | |
446 | //\r | |
447 | // Check if the MOR variable exists.\r | |
448 | //\r | |
1436aea4 | 449 | MorSize = 0;\r |
7516532f LE |
450 | MorStatus = VariableServiceGetVariable (\r |
451 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
452 | &gEfiMemoryOverwriteControlDataGuid,\r | |
453 | NULL, // Attributes\r | |
454 | &MorSize,\r | |
455 | NULL // Data\r | |
456 | );\r | |
f1304280 | 457 | //\r |
7516532f | 458 | // We provided a zero-sized buffer, so the above call can never succeed.\r |
f1304280 | 459 | //\r |
7516532f LE |
460 | ASSERT (EFI_ERROR (MorStatus));\r |
461 | \r | |
462 | if (MorStatus == EFI_BUFFER_TOO_SMALL) {\r | |
463 | //\r | |
fda8f631 | 464 | // The MOR variable exists.\r |
7516532f | 465 | //\r |
fda8f631 LE |
466 | // Some OSes don't follow the TCG's Platform Reset Attack Mitigation spec\r |
467 | // in that the OS should never create the MOR variable, only read and write\r | |
468 | // it -- these OSes (unintentionally) create MOR if the platform firmware\r | |
469 | // does not produce it. Whether this is the case (from the last OS boot)\r | |
470 | // can be deduced from the absence of the TCG / TCG2 protocols, as edk2's\r | |
471 | // MOR implementation depends on (one of) those protocols.\r | |
472 | //\r | |
a855f63e | 473 | if (VariableHaveTcgProtocols ()) {\r |
fda8f631 LE |
474 | //\r |
475 | // The MOR variable originates from the platform firmware; set the MOR\r | |
476 | // Control Lock variable to report the locking capability to the OS.\r | |
477 | //\r | |
478 | SetMorLockVariable (0);\r | |
479 | return;\r | |
480 | }\r | |
481 | \r | |
482 | //\r | |
483 | // The MOR variable's origin is inexplicable; delete it.\r | |
484 | //\r | |
485 | DEBUG ((\r | |
486 | DEBUG_WARN,\r | |
487 | "%a: deleting unexpected / unsupported variable %g:%s\n",\r | |
488 | __FUNCTION__,\r | |
489 | &gEfiMemoryOverwriteControlDataGuid,\r | |
490 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME\r | |
491 | ));\r | |
492 | \r | |
493 | mMorPassThru = TRUE;\r | |
494 | VariableServiceSetVariable (\r | |
495 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
496 | &gEfiMemoryOverwriteControlDataGuid,\r | |
497 | 0, // Attributes\r | |
498 | 0, // DataSize\r | |
499 | NULL // Data\r | |
500 | );\r | |
501 | mMorPassThru = FALSE;\r | |
7516532f LE |
502 | }\r |
503 | \r | |
504 | //\r | |
fda8f631 LE |
505 | // The MOR variable is absent; the platform firmware does not support it.\r |
506 | // Lock the variable so that no other module may create it.\r | |
507 | //\r | |
98ee0c68 | 508 | NewPolicy = NULL;\r |
1436aea4 MK |
509 | Status = CreateBasicVariablePolicy (\r |
510 | &gEfiMemoryOverwriteControlDataGuid,\r | |
511 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
512 | VARIABLE_POLICY_NO_MIN_SIZE,\r | |
513 | VARIABLE_POLICY_NO_MAX_SIZE,\r | |
514 | VARIABLE_POLICY_NO_MUST_ATTR,\r | |
515 | VARIABLE_POLICY_NO_CANT_ATTR,\r | |
516 | VARIABLE_POLICY_TYPE_LOCK_NOW,\r | |
517 | &NewPolicy\r | |
518 | );\r | |
519 | if (!EFI_ERROR (Status)) {\r | |
520 | Status = RegisterVariablePolicy (NewPolicy);\r | |
98ee0c68 | 521 | }\r |
1436aea4 MK |
522 | \r |
523 | if (EFI_ERROR (Status)) {\r | |
524 | DEBUG ((DEBUG_ERROR, "%a - Failed to lock variable %s! %r\n", __FUNCTION__, MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME, Status));\r | |
525 | ASSERT_EFI_ERROR (Status);\r | |
98ee0c68 | 526 | }\r |
1436aea4 | 527 | \r |
98ee0c68 | 528 | if (NewPolicy != NULL) {\r |
1436aea4 | 529 | FreePool (NewPolicy);\r |
98ee0c68 | 530 | }\r |
fda8f631 LE |
531 | \r |
532 | //\r | |
533 | // Delete the MOR Control Lock variable too (should it exists for some\r | |
534 | // reason) and prevent other modules from creating it.\r | |
7516532f LE |
535 | //\r |
536 | mMorLockPassThru = TRUE;\r | |
537 | VariableServiceSetVariable (\r | |
538 | MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME,\r | |
539 | &gEfiMemoryOverwriteRequestControlLockGuid,\r | |
540 | 0, // Attributes\r | |
541 | 0, // DataSize\r | |
542 | NULL // Data\r | |
543 | );\r | |
544 | mMorLockPassThru = FALSE;\r | |
545 | \r | |
98ee0c68 | 546 | NewPolicy = NULL;\r |
1436aea4 MK |
547 | Status = CreateBasicVariablePolicy (\r |
548 | &gEfiMemoryOverwriteRequestControlLockGuid,\r | |
549 | MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME,\r | |
550 | VARIABLE_POLICY_NO_MIN_SIZE,\r | |
551 | VARIABLE_POLICY_NO_MAX_SIZE,\r | |
552 | VARIABLE_POLICY_NO_MUST_ATTR,\r | |
553 | VARIABLE_POLICY_NO_CANT_ATTR,\r | |
554 | VARIABLE_POLICY_TYPE_LOCK_NOW,\r | |
555 | &NewPolicy\r | |
556 | );\r | |
557 | if (!EFI_ERROR (Status)) {\r | |
558 | Status = RegisterVariablePolicy (NewPolicy);\r | |
98ee0c68 | 559 | }\r |
1436aea4 MK |
560 | \r |
561 | if (EFI_ERROR (Status)) {\r | |
562 | DEBUG ((DEBUG_ERROR, "%a - Failed to lock variable %s! %r\n", __FUNCTION__, MEMORY_OVERWRITE_REQUEST_CONTROL_LOCK_NAME, Status));\r | |
563 | ASSERT_EFI_ERROR (Status);\r | |
98ee0c68 | 564 | }\r |
1436aea4 | 565 | \r |
98ee0c68 | 566 | if (NewPolicy != NULL) {\r |
1436aea4 | 567 | FreePool (NewPolicy);\r |
98ee0c68 | 568 | }\r |
f1304280 | 569 | }\r |