projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 0c18794e | 1 | /** @file\r |
| 2 | Implement all four UEFI Runtime Variable services for the nonvolatile\r | |
| 3 | and volatile storage space and install variable architecture protocol\r | |
| 4 | based on SMM variable module.\r | |
| 5 | \r | |
| dc204d5a JY |
6 | Caution: This module requires additional review when modified.\r |
| 7 | This driver will have external input - variable data.\r | |
| 8 | This external input must be validated carefully to avoid security issue like\r | |
| 9 | buffer overflow, integer overflow.\r | |
| 10 | \r | |
| 11 | RuntimeServiceGetVariable() and RuntimeServiceSetVariable() are external API\r | |
| 12 | to receive data buffer. The size should be checked carefully.\r | |
| 13 | \r | |
| 14 | InitCommunicateBuffer() is really function to check the variable data size.\r | |
| 15 | \r | |
| aab9212f | 16 | Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>\r |
| 0c18794e | 17 | This program and the accompanying materials \r |
| 18 | are licensed and made available under the terms and conditions of the BSD License \r | |
| 19 | which accompanies this distribution. The full text of the license may be found at \r | |
| 20 | http://opensource.org/licenses/bsd-license.php\r | |
| 21 | \r | |
| 22 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 23 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 24 | \r | |
| 25 | **/\r | |
| 26 | \r | |
| 27 | #include <PiDxe.h>\r | |
| 28 | #include <Protocol/VariableWrite.h>\r | |
| 29 | #include <Protocol/Variable.h>\r | |
| 30 | #include <Protocol/SmmCommunication.h>\r | |
| 31 | #include <Protocol/SmmVariable.h>\r | |
| 32 | \r | |
| 33 | #include <Library/UefiBootServicesTableLib.h>\r | |
| 34 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
| 35 | #include <Library/MemoryAllocationLib.h>\r | |
| 36 | #include <Library/UefiDriverEntryPoint.h>\r | |
| 37 | #include <Library/UefiRuntimeLib.h>\r | |
| 38 | #include <Library/BaseMemoryLib.h>\r | |
| 39 | #include <Library/DebugLib.h>\r | |
| 40 | #include <Library/PcdLib.h>\r | |
| 41 | #include <Library/UefiLib.h>\r | |
| 42 | #include <Library/BaseLib.h>\r | |
| 43 | \r | |
| 44 | #include <Guid/EventGroup.h>\r | |
| 45 | #include <Guid/AuthenticatedVariableFormat.h>\r | |
| 46 | #include <Guid/SmmVariableCommon.h>\r | |
| 47 | \r | |
| 48 | EFI_HANDLE mHandle = NULL; \r | |
| 49 | EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable = NULL;\r | |
| 50 | EFI_EVENT mVirtualAddressChangeEvent = NULL;\r | |
| 51 | EFI_SMM_COMMUNICATION_PROTOCOL *mSmmCommunication = NULL;\r | |
| 52 | UINT8 *mVariableBuffer = NULL;\r | |
| 53 | UINT8 *mVariableBufferPhysical = NULL;\r | |
| 54 | UINTN mVariableBufferSize;\r | |
| 6ed1ec59 | 55 | EFI_LOCK mVariableServicesLock;\r |
| 0c18794e | 56 | \r |
| 6ed1ec59 SZ |
57 | /**\r |
| 58 | Acquires lock only at boot time. Simply returns at runtime.\r | |
| 59 | \r | |
| 60 | This is a temperary function that will be removed when\r | |
| 61 | EfiAcquireLock() in UefiLib can handle the call in UEFI\r | |
| 62 | Runtimer driver in RT phase.\r | |
| 63 | It calls EfiAcquireLock() at boot time, and simply returns\r | |
| 64 | at runtime.\r | |
| 65 | \r | |
| 66 | @param Lock A pointer to the lock to acquire.\r | |
| 67 | \r | |
| 68 | **/\r | |
| 69 | VOID\r | |
| 70 | AcquireLockOnlyAtBootTime (\r | |
| 71 | IN EFI_LOCK *Lock\r | |
| 72 | )\r | |
| 73 | {\r | |
| 74 | if (!EfiAtRuntime ()) {\r | |
| 75 | EfiAcquireLock (Lock);\r | |
| 76 | }\r | |
| 77 | }\r | |
| 78 | \r | |
| 79 | /**\r | |
| 80 | Releases lock only at boot time. Simply returns at runtime.\r | |
| 81 | \r | |
| 82 | This is a temperary function which will be removed when\r | |
| 83 | EfiReleaseLock() in UefiLib can handle the call in UEFI\r | |
| 84 | Runtimer driver in RT phase.\r | |
| 85 | It calls EfiReleaseLock() at boot time and simply returns\r | |
| 86 | at runtime.\r | |
| 87 | \r | |
| 88 | @param Lock A pointer to the lock to release.\r | |
| 89 | \r | |
| 90 | **/\r | |
| 91 | VOID\r | |
| 92 | ReleaseLockOnlyAtBootTime (\r | |
| 93 | IN EFI_LOCK *Lock\r | |
| 94 | )\r | |
| 95 | {\r | |
| 96 | if (!EfiAtRuntime ()) {\r | |
| 97 | EfiReleaseLock (Lock);\r | |
| 98 | }\r | |
| 99 | }\r | |
| 0c18794e | 100 | \r |
| 101 | /**\r | |
| 102 | Initialize the communicate buffer using DataSize and Function.\r | |
| 103 | \r | |
| 104 | The communicate size is: SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE +\r | |
| 105 | DataSize.\r | |
| 106 | \r | |
| dc204d5a JY |
107 | Caution: This function may receive untrusted input.\r |
| 108 | The data size external input, so this function will validate it carefully to avoid buffer overflow.\r | |
| 109 | \r | |
| 0c18794e | 110 | @param[out] DataPtr Points to the data in the communicate buffer.\r |
| 111 | @param[in] DataSize The data size to send to SMM.\r | |
| 112 | @param[in] Function The function number to initialize the communicate header.\r | |
| 113 | \r | |
| 114 | @retval EFI_INVALID_PARAMETER The data size is too big.\r | |
| 115 | @retval EFI_SUCCESS Find the specified variable.\r | |
| 116 | \r | |
| 117 | **/\r | |
| 118 | EFI_STATUS\r | |
| 119 | InitCommunicateBuffer (\r | |
| 120 | OUT VOID **DataPtr OPTIONAL,\r | |
| 121 | IN UINTN DataSize,\r | |
| 122 | IN UINTN Function\r | |
| 123 | )\r | |
| 124 | {\r | |
| 125 | EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader; \r | |
| 126 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader; \r | |
| 127 | \r | |
| 128 | \r | |
| 129 | if (DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE > mVariableBufferSize) {\r | |
| 130 | return EFI_INVALID_PARAMETER;\r | |
| 131 | }\r | |
| 132 | \r | |
| 133 | SmmCommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *) mVariableBuffer;\r | |
| 134 | CopyGuid (&SmmCommunicateHeader->HeaderGuid, &gEfiSmmVariableProtocolGuid);\r | |
| 135 | SmmCommunicateHeader->MessageLength = DataSize + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
| 136 | \r | |
| 137 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *) SmmCommunicateHeader->Data;\r | |
| 138 | SmmVariableFunctionHeader->Function = Function;\r | |
| 139 | if (DataPtr != NULL) {\r | |
| 140 | *DataPtr = SmmVariableFunctionHeader->Data;\r | |
| 141 | }\r | |
| 142 | \r | |
| 143 | return EFI_SUCCESS;\r | |
| 144 | }\r | |
| 145 | \r | |
| 146 | \r | |
| 147 | /**\r | |
| 148 | Send the data in communicate buffer to SMM.\r | |
| 149 | \r | |
| 150 | @param[in] DataSize This size of the function header and the data.\r | |
| 151 | \r | |
| 152 | @retval EFI_SUCCESS Success is returned from the functin in SMM.\r | |
| 153 | @retval Others Failure is returned from the function in SMM. \r | |
| 154 | \r | |
| 155 | **/\r | |
| 156 | EFI_STATUS\r | |
| 157 | SendCommunicateBuffer (\r | |
| 158 | IN UINTN DataSize\r | |
| 159 | )\r | |
| 160 | {\r | |
| 161 | EFI_STATUS Status;\r | |
| 162 | UINTN CommSize;\r | |
| 163 | EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader; \r | |
| 164 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader;\r | |
| 165 | \r | |
| 166 | CommSize = DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
| 167 | Status = mSmmCommunication->Communicate (mSmmCommunication, mVariableBufferPhysical, &CommSize);\r | |
| 168 | ASSERT_EFI_ERROR (Status);\r | |
| 169 | \r | |
| 170 | SmmCommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *) mVariableBuffer;\r | |
| 171 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *)SmmCommunicateHeader->Data;\r | |
| 172 | return SmmVariableFunctionHeader->ReturnStatus;\r | |
| 173 | }\r | |
| 174 | \r | |
| 175 | \r | |
| 176 | /**\r | |
| 177 | This code finds variable in storage blocks (Volatile or Non-Volatile).\r | |
| 178 | \r | |
| dc204d5a JY |
179 | Caution: This function may receive untrusted input.\r |
| 180 | The data size is external input, so this function will validate it carefully to avoid buffer overflow.\r | |
| 181 | \r | |
| 0c18794e | 182 | @param[in] VariableName Name of Variable to be found.\r |
| 183 | @param[in] VendorGuid Variable vendor GUID.\r | |
| 184 | @param[out] Attributes Attribute value of the variable found.\r | |
| 185 | @param[in, out] DataSize Size of Data found. If size is less than the\r | |
| 186 | data, this value contains the required size.\r | |
| 187 | @param[out] Data Data pointer.\r | |
| 188 | \r | |
| 189 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
| 190 | @retval EFI_SUCCESS Find the specified variable.\r | |
| 191 | @retval EFI_NOT_FOUND Not found.\r | |
| 192 | @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result.\r | |
| 193 | \r | |
| 194 | **/\r | |
| 195 | EFI_STATUS\r | |
| 196 | EFIAPI\r | |
| 197 | RuntimeServiceGetVariable (\r | |
| 198 | IN CHAR16 *VariableName,\r | |
| 199 | IN EFI_GUID *VendorGuid,\r | |
| 200 | OUT UINT32 *Attributes OPTIONAL,\r | |
| 201 | IN OUT UINTN *DataSize,\r | |
| 202 | OUT VOID *Data\r | |
| 203 | )\r | |
| 204 | {\r | |
| 205 | EFI_STATUS Status;\r | |
| 206 | UINTN PayloadSize;\r | |
| 207 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
| 3a146f2a | 208 | UINTN SmmCommBufPayloadSize;\r |
| 209 | UINTN TempDataSize;\r | |
| 0c18794e | 210 | \r |
| 211 | if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {\r | |
| 212 | return EFI_INVALID_PARAMETER;\r | |
| 213 | }\r | |
| 214 | \r | |
| 215 | if ((*DataSize != 0) && (Data == NULL)) {\r | |
| 216 | return EFI_INVALID_PARAMETER;\r | |
| 217 | }\r | |
| 6ed1ec59 | 218 | \r |
| 3a146f2a | 219 | //\r |
| 220 | // SMM Communication Buffer max payload size\r | |
| 221 | //\r | |
| 222 | SmmCommBufPayloadSize = mVariableBufferSize - (SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE);\r | |
| 223 | TempDataSize = *DataSize;\r | |
| 224 | \r | |
| 225 | //\r | |
| 226 | // If VariableName exceeds SMM payload limit. Return failure\r | |
| 227 | //\r | |
| 228 | if (StrSize (VariableName) > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) {\r | |
| 3588bb35 SZ |
229 | return EFI_INVALID_PARAMETER;\r |
| 230 | }\r | |
| 231 | \r | |
| 6ed1ec59 SZ |
232 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 233 | \r | |
| 0c18794e | 234 | //\r |
| 235 | // Init the communicate buffer. The buffer data size is:\r | |
| 6ed1ec59 | 236 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r |
| 0c18794e | 237 | //\r |
| 3a146f2a | 238 | if (TempDataSize > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - StrSize (VariableName)) {\r |
| 239 | //\r | |
| 240 | // If output data buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r | |
| 241 | //\r | |
| 242 | TempDataSize = SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - StrSize (VariableName);\r | |
| 243 | }\r | |
| 244 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + TempDataSize;\r | |
| 245 | \r | |
| 0c18794e | 246 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_GET_VARIABLE);\r |
| 247 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 248 | goto Done;\r |
| 0c18794e | 249 | }\r |
| 250 | ASSERT (SmmVariableHeader != NULL);\r | |
| 251 | \r | |
| 252 | CopyGuid (&SmmVariableHeader->Guid, VendorGuid);\r | |
| 3a146f2a | 253 | SmmVariableHeader->DataSize = TempDataSize;\r |
| 0c18794e | 254 | SmmVariableHeader->NameSize = StrSize (VariableName);\r |
| 255 | if (Attributes == NULL) {\r | |
| 256 | SmmVariableHeader->Attributes = 0;\r | |
| 257 | } else {\r | |
| 258 | SmmVariableHeader->Attributes = *Attributes;\r | |
| 259 | }\r | |
| 260 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
| 261 | \r | |
| 262 | //\r | |
| 263 | // Send data to SMM.\r | |
| 264 | //\r | |
| 265 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 266 | \r | |
| 267 | //\r | |
| 268 | // Get data from SMM.\r | |
| 269 | //\r | |
| 3a146f2a | 270 | if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {\r |
| 271 | //\r | |
| 272 | // SMM CommBuffer DataSize can be a trimed value\r | |
| 273 | // Only update DataSize when needed\r | |
| 274 | //\r | |
| 275 | *DataSize = SmmVariableHeader->DataSize;\r | |
| 276 | }\r | |
| 0c18794e | 277 | if (Attributes != NULL) {\r |
| 278 | *Attributes = SmmVariableHeader->Attributes;\r | |
| 279 | }\r | |
| 280 | \r | |
| 281 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 282 | goto Done;\r |
| 0c18794e | 283 | }\r |
| 284 | \r | |
| 285 | CopyMem (Data, (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize, SmmVariableHeader->DataSize);\r | |
| 286 | \r | |
| 6ed1ec59 SZ |
287 | Done:\r |
| 288 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 289 | return Status;\r |
| 290 | }\r | |
| 291 | \r | |
| 292 | \r | |
| 293 | /**\r | |
| 294 | This code Finds the Next available variable.\r | |
| 295 | \r | |
| 296 | @param[in, out] VariableNameSize Size of the variable name.\r | |
| 297 | @param[in, out] VariableName Pointer to variable name.\r | |
| 298 | @param[in, out] VendorGuid Variable Vendor Guid.\r | |
| 299 | \r | |
| 300 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
| 301 | @retval EFI_SUCCESS Find the specified variable.\r | |
| 302 | @retval EFI_NOT_FOUND Not found.\r | |
| 303 | @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result.\r | |
| 304 | \r | |
| 305 | **/\r | |
| 306 | EFI_STATUS\r | |
| 307 | EFIAPI\r | |
| 308 | RuntimeServiceGetNextVariableName (\r | |
| 309 | IN OUT UINTN *VariableNameSize,\r | |
| 310 | IN OUT CHAR16 *VariableName,\r | |
| 311 | IN OUT EFI_GUID *VendorGuid\r | |
| 312 | )\r | |
| 313 | {\r | |
| 314 | EFI_STATUS Status;\r | |
| 315 | UINTN PayloadSize;\r | |
| 316 | SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *SmmGetNextVariableName;\r | |
| 0c55190f | 317 | UINTN SmmCommBufPayloadSize;\r |
| 0c18794e | 318 | \r |
| 319 | if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {\r | |
| 320 | return EFI_INVALID_PARAMETER;\r | |
| 321 | }\r | |
| 6ed1ec59 | 322 | \r |
| 0c55190f | 323 | //\r |
| 324 | // SMM Communication Buffer max payload size\r | |
| 325 | //\r | |
| 326 | SmmCommBufPayloadSize = mVariableBufferSize - (SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE);\r | |
| 327 | \r | |
| 328 | //\r | |
| 329 | // If input string exceeds SMM payload limit. Return failure\r | |
| 330 | //\r | |
| 331 | if (StrSize (VariableName) > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r | |
| 3588bb35 SZ |
332 | return EFI_INVALID_PARAMETER;\r |
| 333 | }\r | |
| 334 | \r | |
| 6ed1ec59 SZ |
335 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 336 | \r | |
| 0c18794e | 337 | //\r |
| 338 | // Init the communicate buffer. The buffer data size is:\r | |
| 339 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
| 340 | //\r | |
| 0c55190f | 341 | if (*VariableNameSize > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
| 342 | //\r | |
| 343 | // If output buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r | |
| 344 | //\r | |
| 345 | *VariableNameSize = SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name);\r | |
| 346 | }\r | |
| 347 | //\r | |
| 348 | // Payload should be Guid + NameSize + MAX of Input & Output buffer\r | |
| 349 | //\r | |
| 350 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + MAX (*VariableNameSize, StrSize (VariableName));\r | |
| 351 | \r | |
| 0c18794e | 352 | Status = InitCommunicateBuffer ((VOID **)&SmmGetNextVariableName, PayloadSize, SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME);\r |
| 353 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 354 | goto Done;\r |
| 0c18794e | 355 | }\r |
| 356 | ASSERT (SmmGetNextVariableName != NULL);\r | |
| 357 | \r | |
| 0c55190f | 358 | //\r |
| 359 | // SMM comm buffer->NameSize is buffer size for return string\r | |
| 360 | //\r | |
| 0c18794e | 361 | SmmGetNextVariableName->NameSize = *VariableNameSize;\r |
| 0c55190f | 362 | \r |
| 0c18794e | 363 | CopyGuid (&SmmGetNextVariableName->Guid, VendorGuid);\r |
| 0c55190f | 364 | //\r |
| 365 | // Copy whole string\r | |
| 366 | //\r | |
| 367 | CopyMem (SmmGetNextVariableName->Name, VariableName, StrSize (VariableName));\r | |
| 0c18794e | 368 | \r |
| 369 | //\r | |
| 370 | // Send data to SMM\r | |
| 371 | //\r | |
| 372 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 373 | \r | |
| 374 | //\r | |
| 375 | // Get data from SMM.\r | |
| 376 | //\r | |
| 377 | *VariableNameSize = SmmGetNextVariableName->NameSize; \r | |
| 378 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 379 | goto Done;\r |
| 0c18794e | 380 | }\r |
| 381 | \r | |
| 382 | CopyGuid (VendorGuid, &SmmGetNextVariableName->Guid);\r | |
| 383 | CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize); \r | |
| 384 | \r | |
| 6ed1ec59 SZ |
385 | Done:\r |
| 386 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 387 | return Status;\r |
| 388 | }\r | |
| 389 | \r | |
| 390 | /**\r | |
| 391 | This code sets variable in storage blocks (Volatile or Non-Volatile).\r | |
| 392 | \r | |
| dc204d5a JY |
393 | Caution: This function may receive untrusted input.\r |
| 394 | The data size and data are external input, so this function will validate it carefully to avoid buffer overflow.\r | |
| 395 | \r | |
| 0c18794e | 396 | @param[in] VariableName Name of Variable to be found.\r |
| 397 | @param[in] VendorGuid Variable vendor GUID.\r | |
| 398 | @param[in] Attributes Attribute value of the variable found\r | |
| 399 | @param[in] DataSize Size of Data found. If size is less than the\r | |
| 400 | data, this value contains the required size.\r | |
| 401 | @param[in] Data Data pointer.\r | |
| 402 | \r | |
| 403 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
| 404 | @retval EFI_SUCCESS Set successfully.\r | |
| 405 | @retval EFI_OUT_OF_RESOURCES Resource not enough to set variable.\r | |
| 406 | @retval EFI_NOT_FOUND Not found.\r | |
| 407 | @retval EFI_WRITE_PROTECTED Variable is read-only.\r | |
| 408 | \r | |
| 409 | **/\r | |
| 410 | EFI_STATUS\r | |
| 411 | EFIAPI\r | |
| 412 | RuntimeServiceSetVariable (\r | |
| 413 | IN CHAR16 *VariableName,\r | |
| 414 | IN EFI_GUID *VendorGuid,\r | |
| 415 | IN UINT32 Attributes,\r | |
| 416 | IN UINTN DataSize,\r | |
| 417 | IN VOID *Data\r | |
| 418 | )\r | |
| 419 | {\r | |
| 420 | EFI_STATUS Status;\r | |
| 421 | UINTN PayloadSize; \r | |
| 422 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
| 423 | \r | |
| 424 | //\r | |
| 425 | // Check input parameters.\r | |
| 426 | //\r | |
| 427 | if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r | |
| 428 | return EFI_INVALID_PARAMETER;\r | |
| 429 | } \r | |
| 430 | \r | |
| 431 | if (DataSize != 0 && Data == NULL) {\r | |
| 432 | return EFI_INVALID_PARAMETER;\r | |
| 433 | }\r | |
| 6ed1ec59 | 434 | \r |
| 3588bb35 SZ |
435 | if (DataSize >= mVariableBufferSize) {\r |
| 436 | //\r | |
| 437 | // DataSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to\r | |
| 438 | // overflow to a small value and pass the check in InitCommunicateBuffer().\r | |
| 439 | // To protect against this vulnerability, return EFI_INVALID_PARAMETER if DataSize is >= mVariableBufferSize.\r | |
| 440 | // And there will be further check to ensure the total size is also not > mVariableBufferSize.\r | |
| 441 | //\r | |
| 442 | return EFI_INVALID_PARAMETER;\r | |
| 443 | }\r | |
| 444 | \r | |
| 6ed1ec59 SZ |
445 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 446 | \r | |
| 0c18794e | 447 | //\r |
| 448 | // Init the communicate buffer. The buffer data size is:\r | |
| 449 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
| 450 | //\r | |
| 451 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + DataSize;\r | |
| 452 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_SET_VARIABLE);\r | |
| 453 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 454 | goto Done;\r |
| 0c18794e | 455 | }\r |
| 456 | ASSERT (SmmVariableHeader != NULL);\r | |
| 457 | \r | |
| 458 | CopyGuid ((EFI_GUID *) &SmmVariableHeader->Guid, VendorGuid);\r | |
| 459 | SmmVariableHeader->DataSize = DataSize;\r | |
| 460 | SmmVariableHeader->NameSize = StrSize (VariableName);\r | |
| 461 | SmmVariableHeader->Attributes = Attributes;\r | |
| 462 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
| 463 | CopyMem ((UINT8 *) SmmVariableHeader->Name + SmmVariableHeader->NameSize, Data, DataSize);\r | |
| 464 | \r | |
| 465 | //\r | |
| 466 | // Send data to SMM.\r | |
| 467 | //\r | |
| 468 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 6ed1ec59 SZ |
469 | \r |
| 470 | Done:\r | |
| 471 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 472 | return Status;\r |
| 473 | }\r | |
| 474 | \r | |
| 475 | \r | |
| 476 | /**\r | |
| 477 | This code returns information about the EFI variables.\r | |
| 478 | \r | |
| 479 | @param[in] Attributes Attributes bitmask to specify the type of variables\r | |
| 480 | on which to return information.\r | |
| 481 | @param[out] MaximumVariableStorageSize Pointer to the maximum size of the storage space available\r | |
| 482 | for the EFI variables associated with the attributes specified.\r | |
| 483 | @param[out] RemainingVariableStorageSize Pointer to the remaining size of the storage space available\r | |
| 484 | for EFI variables associated with the attributes specified.\r | |
| 485 | @param[out] MaximumVariableSize Pointer to the maximum size of an individual EFI variables\r | |
| 486 | associated with the attributes specified.\r | |
| 487 | \r | |
| 488 | @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.\r | |
| 489 | @retval EFI_SUCCESS Query successfully.\r | |
| 490 | @retval EFI_UNSUPPORTED The attribute is not supported on this platform.\r | |
| 491 | \r | |
| 492 | **/\r | |
| 493 | EFI_STATUS\r | |
| 494 | EFIAPI\r | |
| 495 | RuntimeServiceQueryVariableInfo (\r | |
| 496 | IN UINT32 Attributes,\r | |
| 497 | OUT UINT64 *MaximumVariableStorageSize,\r | |
| 498 | OUT UINT64 *RemainingVariableStorageSize,\r | |
| 499 | OUT UINT64 *MaximumVariableSize\r | |
| 500 | )\r | |
| 501 | {\r | |
| 502 | EFI_STATUS Status;\r | |
| 503 | UINTN PayloadSize;\r | |
| 504 | SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *SmmQueryVariableInfo;\r | |
| 505 | \r | |
| 506 | if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {\r | |
| 507 | return EFI_INVALID_PARAMETER;\r | |
| 508 | }\r | |
| 6ed1ec59 SZ |
509 | \r |
| 510 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r | |
| 511 | \r | |
| 0c18794e | 512 | //\r |
| 513 | // Init the communicate buffer. The buffer data size is:\r | |
| 514 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize;\r | |
| 515 | //\r | |
| 516 | PayloadSize = sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);\r | |
| 517 | Status = InitCommunicateBuffer ((VOID **)&SmmQueryVariableInfo, PayloadSize, SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO);\r | |
| 518 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 519 | goto Done;\r |
| 0c18794e | 520 | }\r |
| 521 | ASSERT (SmmQueryVariableInfo != NULL);\r | |
| 522 | \r | |
| 523 | SmmQueryVariableInfo->Attributes = Attributes;\r | |
| 524 | \r | |
| 525 | //\r | |
| 526 | // Send data to SMM.\r | |
| 527 | //\r | |
| 528 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 529 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 530 | goto Done;\r |
| 0c18794e | 531 | }\r |
| 532 | \r | |
| 533 | //\r | |
| 534 | // Get data from SMM.\r | |
| 535 | //\r | |
| 536 | *MaximumVariableSize = SmmQueryVariableInfo->MaximumVariableSize;\r | |
| 537 | *MaximumVariableStorageSize = SmmQueryVariableInfo->MaximumVariableStorageSize;\r | |
| 538 | *RemainingVariableStorageSize = SmmQueryVariableInfo->RemainingVariableStorageSize; \r | |
| 6ed1ec59 SZ |
539 | \r |
| 540 | Done:\r | |
| 541 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| aab9212f | 542 | return Status;\r |
| 0c18794e | 543 | }\r |
| 544 | \r | |
| 545 | \r | |
| 546 | /**\r | |
| 547 | Exit Boot Services Event notification handler.\r | |
| 548 | \r | |
| 549 | Notify SMM variable driver about the event.\r | |
| 550 | \r | |
| 551 | @param[in] Event Event whose notification function is being invoked.\r | |
| 552 | @param[in] Context Pointer to the notification function's context.\r | |
| 553 | \r | |
| 554 | **/\r | |
| 555 | VOID\r | |
| 556 | EFIAPI\r | |
| 557 | OnExitBootServices (\r | |
| 558 | IN EFI_EVENT Event,\r | |
| 559 | IN VOID *Context\r | |
| 560 | )\r | |
| 561 | {\r | |
| 562 | //\r | |
| 563 | // Init the communicate buffer. The buffer data size is:\r | |
| 564 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
| 565 | //\r | |
| 566 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE); \r | |
| 567 | \r | |
| 568 | //\r | |
| 569 | // Send data to SMM.\r | |
| 570 | //\r | |
| 571 | SendCommunicateBuffer (0);\r | |
| 572 | }\r | |
| 573 | \r | |
| 574 | \r | |
| 575 | /**\r | |
| 576 | On Ready To Boot Services Event notification handler.\r | |
| 577 | \r | |
| 578 | Notify SMM variable driver about the event.\r | |
| 579 | \r | |
| 580 | @param[in] Event Event whose notification function is being invoked\r | |
| 581 | @param[in] Context Pointer to the notification function's context\r | |
| 582 | \r | |
| 583 | **/\r | |
| 584 | VOID\r | |
| 585 | EFIAPI\r | |
| 586 | OnReadyToBoot (\r | |
| 587 | IN EFI_EVENT Event,\r | |
| 588 | IN VOID *Context\r | |
| 589 | )\r | |
| 590 | {\r | |
| 591 | //\r | |
| 592 | // Init the communicate buffer. The buffer data size is:\r | |
| 593 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
| 594 | //\r | |
| 595 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_READY_TO_BOOT);\r | |
| 596 | \r | |
| 597 | //\r | |
| 598 | // Send data to SMM.\r | |
| 599 | //\r | |
| 600 | SendCommunicateBuffer (0);\r | |
| 601 | }\r | |
| 602 | \r | |
| 603 | \r | |
| 604 | /**\r | |
| 605 | Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.\r | |
| 606 | \r | |
| 607 | This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
| 608 | It convers pointer to new virtual address.\r | |
| 609 | \r | |
| 610 | @param[in] Event Event whose notification function is being invoked.\r | |
| 611 | @param[in] Context Pointer to the notification function's context.\r | |
| 612 | \r | |
| 613 | **/\r | |
| 614 | VOID\r | |
| 615 | EFIAPI\r | |
| 616 | VariableAddressChangeEvent (\r | |
| 617 | IN EFI_EVENT Event,\r | |
| 618 | IN VOID *Context\r | |
| 619 | )\r | |
| 620 | {\r | |
| 621 | EfiConvertPointer (0x0, (VOID **) &mVariableBuffer);\r | |
| 622 | EfiConvertPointer (0x0, (VOID **) &mSmmCommunication);\r | |
| 623 | }\r | |
| 624 | \r | |
| 625 | \r | |
| 626 | /**\r | |
| 627 | Initialize variable service and install Variable Architectural protocol.\r | |
| 628 | \r | |
| 629 | @param[in] Event Event whose notification function is being invoked.\r | |
| 630 | @param[in] Context Pointer to the notification function's context.\r | |
| 631 | \r | |
| 632 | **/\r | |
| 633 | VOID\r | |
| 634 | EFIAPI\r | |
| 635 | SmmVariableReady (\r | |
| 636 | IN EFI_EVENT Event,\r | |
| 637 | IN VOID *Context\r | |
| 638 | )\r | |
| 639 | {\r | |
| 640 | EFI_STATUS Status;\r | |
| 641 | \r | |
| 642 | Status = gBS->LocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID **)&mSmmVariable);\r | |
| 643 | if (EFI_ERROR (Status)) {\r | |
| 644 | return;\r | |
| 645 | }\r | |
| 646 | \r | |
| 647 | Status = gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);\r | |
| 648 | ASSERT_EFI_ERROR (Status);\r | |
| 649 | \r | |
| 650 | //\r | |
| 651 | // Allocate memory for variable store.\r | |
| 652 | //\r | |
| 653 | mVariableBufferSize = SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
| 654 | mVariableBufferSize += MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));\r | |
| 655 | mVariableBuffer = AllocateRuntimePool (mVariableBufferSize);\r | |
| 656 | ASSERT (mVariableBuffer != NULL);\r | |
| 657 | \r | |
| 658 | //\r | |
| 659 | // Save the buffer physical address used for SMM conmunication.\r | |
| 660 | //\r | |
| 661 | mVariableBufferPhysical = mVariableBuffer;\r | |
| 662 | \r | |
| 663 | gRT->GetVariable = RuntimeServiceGetVariable;\r | |
| 664 | gRT->GetNextVariableName = RuntimeServiceGetNextVariableName;\r | |
| 665 | gRT->SetVariable = RuntimeServiceSetVariable;\r | |
| 666 | gRT->QueryVariableInfo = RuntimeServiceQueryVariableInfo;\r | |
| 667 | \r | |
| 668 | //\r | |
| 669 | // Install the Variable Architectural Protocol on a new handle.\r | |
| 670 | //\r | |
| 671 | Status = gBS->InstallProtocolInterface (\r | |
| 672 | &mHandle,\r | |
| 673 | &gEfiVariableArchProtocolGuid, \r | |
| 674 | EFI_NATIVE_INTERFACE,\r | |
| 675 | NULL\r | |
| 676 | );\r | |
| 677 | ASSERT_EFI_ERROR (Status);\r | |
| 678 | }\r | |
| 679 | \r | |
| 680 | \r | |
| 681 | /**\r | |
| 682 | SMM Non-Volatile variable write service is ready notify event handler.\r | |
| 683 | \r | |
| 684 | @param[in] Event Event whose notification function is being invoked.\r | |
| 685 | @param[in] Context Pointer to the notification function's context.\r | |
| 686 | \r | |
| 687 | **/\r | |
| 688 | VOID\r | |
| 689 | EFIAPI\r | |
| 690 | SmmVariableWriteReady (\r | |
| 691 | IN EFI_EVENT Event,\r | |
| 692 | IN VOID *Context\r | |
| 693 | )\r | |
| 694 | {\r | |
| 695 | EFI_STATUS Status;\r | |
| 696 | VOID *ProtocolOps;\r | |
| 697 | \r | |
| 698 | //\r | |
| 699 | // Check whether the protocol is installed or not.\r | |
| 700 | //\r | |
| 701 | Status = gBS->LocateProtocol (&gSmmVariableWriteGuid, NULL, (VOID **) &ProtocolOps);\r | |
| 702 | if (EFI_ERROR (Status)) {\r | |
| 703 | return;\r | |
| 704 | }\r | |
| 705 | \r | |
| 706 | Status = gBS->InstallProtocolInterface (\r | |
| 707 | &mHandle,\r | |
| 708 | &gEfiVariableWriteArchProtocolGuid, \r | |
| 709 | EFI_NATIVE_INTERFACE,\r | |
| 710 | NULL\r | |
| 711 | );\r | |
| 712 | ASSERT_EFI_ERROR (Status); \r | |
| 713 | }\r | |
| 714 | \r | |
| 715 | \r | |
| 716 | /**\r | |
| 717 | Variable Driver main entry point. The Variable driver places the 4 EFI\r | |
| 718 | runtime services in the EFI System Table and installs arch protocols \r | |
| 719 | for variable read and write services being available. It also registers\r | |
| 720 | a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
| 721 | \r | |
| 722 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
| 723 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
| 724 | \r | |
| 725 | @retval EFI_SUCCESS Variable service successfully initialized.\r | |
| 726 | \r | |
| 727 | **/\r | |
| 728 | EFI_STATUS\r | |
| 729 | EFIAPI\r | |
| 730 | VariableSmmRuntimeInitialize (\r | |
| 731 | IN EFI_HANDLE ImageHandle,\r | |
| 732 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
| 733 | )\r | |
| 734 | {\r | |
| 735 | VOID *SmmVariableRegistration;\r | |
| 736 | VOID *SmmVariableWriteRegistration;\r | |
| 737 | EFI_EVENT OnReadyToBootEvent;\r | |
| 738 | EFI_EVENT ExitBootServiceEvent;\r | |
| 6ed1ec59 SZ |
739 | \r |
| 740 | EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r | |
| 741 | \r | |
| 0c18794e | 742 | //\r |
| 743 | // Smm variable service is ready\r | |
| 744 | //\r | |
| 745 | EfiCreateProtocolNotifyEvent (\r | |
| 746 | &gEfiSmmVariableProtocolGuid, \r | |
| 747 | TPL_CALLBACK, \r | |
| 748 | SmmVariableReady, \r | |
| 749 | NULL, \r | |
| 750 | &SmmVariableRegistration\r | |
| 751 | );\r | |
| 752 | \r | |
| 753 | //\r | |
| 754 | // Smm Non-Volatile variable write service is ready\r | |
| 755 | //\r | |
| 756 | EfiCreateProtocolNotifyEvent (\r | |
| 757 | &gSmmVariableWriteGuid, \r | |
| 758 | TPL_CALLBACK, \r | |
| 759 | SmmVariableWriteReady, \r | |
| 760 | NULL, \r | |
| 761 | &SmmVariableWriteRegistration\r | |
| 762 | );\r | |
| 763 | \r | |
| 764 | //\r | |
| 765 | // Register the event to reclaim variable for OS usage.\r | |
| 766 | //\r | |
| 767 | EfiCreateEventReadyToBootEx (\r | |
| 768 | TPL_NOTIFY, \r | |
| 769 | OnReadyToBoot, \r | |
| 770 | NULL, \r | |
| 771 | &OnReadyToBootEvent\r | |
| 772 | ); \r | |
| 773 | \r | |
| 774 | //\r | |
| 775 | // Register the event to inform SMM variable that it is at runtime.\r | |
| 776 | //\r | |
| 777 | gBS->CreateEventEx (\r | |
| 778 | EVT_NOTIFY_SIGNAL,\r | |
| 779 | TPL_NOTIFY,\r | |
| 780 | OnExitBootServices,\r | |
| 781 | NULL,\r | |
| 782 | &gEfiEventExitBootServicesGuid,\r | |
| 783 | &ExitBootServiceEvent\r | |
| 784 | ); \r | |
| 785 | \r | |
| 786 | //\r | |
| 787 | // Register the event to convert the pointer for runtime.\r | |
| 788 | //\r | |
| 789 | gBS->CreateEventEx (\r | |
| 790 | EVT_NOTIFY_SIGNAL,\r | |
| 791 | TPL_NOTIFY,\r | |
| 792 | VariableAddressChangeEvent,\r | |
| 793 | NULL,\r | |
| 794 | &gEfiEventVirtualAddressChangeGuid,\r | |
| 795 | &mVirtualAddressChangeEvent\r | |
| 796 | );\r | |
| 797 | \r | |
| 798 | return EFI_SUCCESS;\r | |
| 799 | }\r | |
| 800 | \r |