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 | |
| 208 | \r | |
| 209 | if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {\r | |
| 210 | return EFI_INVALID_PARAMETER;\r | |
| 211 | }\r | |
| 212 | \r | |
| 213 | if ((*DataSize != 0) && (Data == NULL)) {\r | |
| 214 | return EFI_INVALID_PARAMETER;\r | |
| 215 | }\r | |
| 6ed1ec59 | 216 | \r |
| 3588bb35 SZ |
217 | if (*DataSize >= mVariableBufferSize) {\r |
| 218 | //\r | |
| 219 | // DataSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to\r | |
| 220 | // overflow to a small value and pass the check in InitCommunicateBuffer().\r | |
| 221 | // To protect against this vulnerability, return EFI_INVALID_PARAMETER if DataSize is >= mVariableBufferSize.\r | |
| 222 | // And there will be further check to ensure the total size is also not > mVariableBufferSize.\r | |
| 223 | //\r | |
| 224 | return EFI_INVALID_PARAMETER;\r | |
| 225 | }\r | |
| 226 | \r | |
| 6ed1ec59 SZ |
227 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 228 | \r | |
| 0c18794e | 229 | //\r |
| 230 | // Init the communicate buffer. The buffer data size is:\r | |
| 6ed1ec59 | 231 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r |
| 0c18794e | 232 | //\r |
| 96277f74 | 233 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + *DataSize;\r |
| 0c18794e | 234 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_GET_VARIABLE);\r |
| 235 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 236 | goto Done;\r |
| 0c18794e | 237 | }\r |
| 238 | ASSERT (SmmVariableHeader != NULL);\r | |
| 239 | \r | |
| 240 | CopyGuid (&SmmVariableHeader->Guid, VendorGuid);\r | |
| 241 | SmmVariableHeader->DataSize = *DataSize;\r | |
| 242 | SmmVariableHeader->NameSize = StrSize (VariableName);\r | |
| 243 | if (Attributes == NULL) {\r | |
| 244 | SmmVariableHeader->Attributes = 0;\r | |
| 245 | } else {\r | |
| 246 | SmmVariableHeader->Attributes = *Attributes;\r | |
| 247 | }\r | |
| 248 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
| 249 | \r | |
| 250 | //\r | |
| 251 | // Send data to SMM.\r | |
| 252 | //\r | |
| 253 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 254 | \r | |
| 255 | //\r | |
| 256 | // Get data from SMM.\r | |
| 257 | //\r | |
| 258 | *DataSize = SmmVariableHeader->DataSize;\r | |
| 259 | if (Attributes != NULL) {\r | |
| 260 | *Attributes = SmmVariableHeader->Attributes;\r | |
| 261 | }\r | |
| 262 | \r | |
| 263 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 264 | goto Done;\r |
| 0c18794e | 265 | }\r |
| 266 | \r | |
| 267 | CopyMem (Data, (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize, SmmVariableHeader->DataSize);\r | |
| 268 | \r | |
| 6ed1ec59 SZ |
269 | Done:\r |
| 270 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 271 | return Status;\r |
| 272 | }\r | |
| 273 | \r | |
| 274 | \r | |
| 275 | /**\r | |
| 276 | This code Finds the Next available variable.\r | |
| 277 | \r | |
| 278 | @param[in, out] VariableNameSize Size of the variable name.\r | |
| 279 | @param[in, out] VariableName Pointer to variable name.\r | |
| 280 | @param[in, out] VendorGuid Variable Vendor Guid.\r | |
| 281 | \r | |
| 282 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
| 283 | @retval EFI_SUCCESS Find the specified variable.\r | |
| 284 | @retval EFI_NOT_FOUND Not found.\r | |
| 285 | @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result.\r | |
| 286 | \r | |
| 287 | **/\r | |
| 288 | EFI_STATUS\r | |
| 289 | EFIAPI\r | |
| 290 | RuntimeServiceGetNextVariableName (\r | |
| 291 | IN OUT UINTN *VariableNameSize,\r | |
| 292 | IN OUT CHAR16 *VariableName,\r | |
| 293 | IN OUT EFI_GUID *VendorGuid\r | |
| 294 | )\r | |
| 295 | {\r | |
| 296 | EFI_STATUS Status;\r | |
| 297 | UINTN PayloadSize;\r | |
| 298 | SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *SmmGetNextVariableName;\r | |
| 0c55190f | 299 | UINTN SmmCommBufPayloadSize;\r |
| 0c18794e | 300 | \r |
| 301 | if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {\r | |
| 302 | return EFI_INVALID_PARAMETER;\r | |
| 303 | }\r | |
| 6ed1ec59 | 304 | \r |
| 0c55190f | 305 | //\r |
| 306 | // SMM Communication Buffer max payload size\r | |
| 307 | //\r | |
| 308 | SmmCommBufPayloadSize = mVariableBufferSize - (SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE);\r | |
| 309 | \r | |
| 310 | //\r | |
| 311 | // If input string exceeds SMM payload limit. Return failure\r | |
| 312 | //\r | |
| 313 | if (StrSize (VariableName) > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r | |
| 3588bb35 SZ |
314 | return EFI_INVALID_PARAMETER;\r |
| 315 | }\r | |
| 316 | \r | |
| 6ed1ec59 SZ |
317 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 318 | \r | |
| 0c18794e | 319 | //\r |
| 320 | // Init the communicate buffer. The buffer data size is:\r | |
| 321 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
| 322 | //\r | |
| 0c55190f | 323 | if (*VariableNameSize > SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
| 324 | //\r | |
| 325 | // If output buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r | |
| 326 | //\r | |
| 327 | *VariableNameSize = SmmCommBufPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name);\r | |
| 328 | }\r | |
| 329 | //\r | |
| 330 | // Payload should be Guid + NameSize + MAX of Input & Output buffer\r | |
| 331 | //\r | |
| 332 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + MAX (*VariableNameSize, StrSize (VariableName));\r | |
| 333 | \r | |
| 0c18794e | 334 | Status = InitCommunicateBuffer ((VOID **)&SmmGetNextVariableName, PayloadSize, SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME);\r |
| 335 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 336 | goto Done;\r |
| 0c18794e | 337 | }\r |
| 338 | ASSERT (SmmGetNextVariableName != NULL);\r | |
| 339 | \r | |
| 0c55190f | 340 | //\r |
| 341 | // SMM comm buffer->NameSize is buffer size for return string\r | |
| 342 | //\r | |
| 0c18794e | 343 | SmmGetNextVariableName->NameSize = *VariableNameSize;\r |
| 0c55190f | 344 | \r |
| 0c18794e | 345 | CopyGuid (&SmmGetNextVariableName->Guid, VendorGuid);\r |
| 0c55190f | 346 | //\r |
| 347 | // Copy whole string\r | |
| 348 | //\r | |
| 349 | CopyMem (SmmGetNextVariableName->Name, VariableName, StrSize (VariableName));\r | |
| 0c18794e | 350 | \r |
| 351 | //\r | |
| 352 | // Send data to SMM\r | |
| 353 | //\r | |
| 354 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 355 | \r | |
| 356 | //\r | |
| 357 | // Get data from SMM.\r | |
| 358 | //\r | |
| 359 | *VariableNameSize = SmmGetNextVariableName->NameSize; \r | |
| 360 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 361 | goto Done;\r |
| 0c18794e | 362 | }\r |
| 363 | \r | |
| 364 | CopyGuid (VendorGuid, &SmmGetNextVariableName->Guid);\r | |
| 365 | CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize); \r | |
| 366 | \r | |
| 6ed1ec59 SZ |
367 | Done:\r |
| 368 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 369 | return Status;\r |
| 370 | }\r | |
| 371 | \r | |
| 372 | /**\r | |
| 373 | This code sets variable in storage blocks (Volatile or Non-Volatile).\r | |
| 374 | \r | |
| dc204d5a JY |
375 | Caution: This function may receive untrusted input.\r |
| 376 | The data size and data are external input, so this function will validate it carefully to avoid buffer overflow.\r | |
| 377 | \r | |
| 0c18794e | 378 | @param[in] VariableName Name of Variable to be found.\r |
| 379 | @param[in] VendorGuid Variable vendor GUID.\r | |
| 380 | @param[in] Attributes Attribute value of the variable found\r | |
| 381 | @param[in] DataSize Size of Data found. If size is less than the\r | |
| 382 | data, this value contains the required size.\r | |
| 383 | @param[in] Data Data pointer.\r | |
| 384 | \r | |
| 385 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
| 386 | @retval EFI_SUCCESS Set successfully.\r | |
| 387 | @retval EFI_OUT_OF_RESOURCES Resource not enough to set variable.\r | |
| 388 | @retval EFI_NOT_FOUND Not found.\r | |
| 389 | @retval EFI_WRITE_PROTECTED Variable is read-only.\r | |
| 390 | \r | |
| 391 | **/\r | |
| 392 | EFI_STATUS\r | |
| 393 | EFIAPI\r | |
| 394 | RuntimeServiceSetVariable (\r | |
| 395 | IN CHAR16 *VariableName,\r | |
| 396 | IN EFI_GUID *VendorGuid,\r | |
| 397 | IN UINT32 Attributes,\r | |
| 398 | IN UINTN DataSize,\r | |
| 399 | IN VOID *Data\r | |
| 400 | )\r | |
| 401 | {\r | |
| 402 | EFI_STATUS Status;\r | |
| 403 | UINTN PayloadSize; \r | |
| 404 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
| 405 | \r | |
| 406 | //\r | |
| 407 | // Check input parameters.\r | |
| 408 | //\r | |
| 409 | if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r | |
| 410 | return EFI_INVALID_PARAMETER;\r | |
| 411 | } \r | |
| 412 | \r | |
| 413 | if (DataSize != 0 && Data == NULL) {\r | |
| 414 | return EFI_INVALID_PARAMETER;\r | |
| 415 | }\r | |
| 6ed1ec59 | 416 | \r |
| 3588bb35 SZ |
417 | if (DataSize >= mVariableBufferSize) {\r |
| 418 | //\r | |
| 419 | // DataSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to\r | |
| 420 | // overflow to a small value and pass the check in InitCommunicateBuffer().\r | |
| 421 | // To protect against this vulnerability, return EFI_INVALID_PARAMETER if DataSize is >= mVariableBufferSize.\r | |
| 422 | // And there will be further check to ensure the total size is also not > mVariableBufferSize.\r | |
| 423 | //\r | |
| 424 | return EFI_INVALID_PARAMETER;\r | |
| 425 | }\r | |
| 426 | \r | |
| 6ed1ec59 SZ |
427 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
| 428 | \r | |
| 0c18794e | 429 | //\r |
| 430 | // Init the communicate buffer. The buffer data size is:\r | |
| 431 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
| 432 | //\r | |
| 433 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + DataSize;\r | |
| 434 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_SET_VARIABLE);\r | |
| 435 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 436 | goto Done;\r |
| 0c18794e | 437 | }\r |
| 438 | ASSERT (SmmVariableHeader != NULL);\r | |
| 439 | \r | |
| 440 | CopyGuid ((EFI_GUID *) &SmmVariableHeader->Guid, VendorGuid);\r | |
| 441 | SmmVariableHeader->DataSize = DataSize;\r | |
| 442 | SmmVariableHeader->NameSize = StrSize (VariableName);\r | |
| 443 | SmmVariableHeader->Attributes = Attributes;\r | |
| 444 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
| 445 | CopyMem ((UINT8 *) SmmVariableHeader->Name + SmmVariableHeader->NameSize, Data, DataSize);\r | |
| 446 | \r | |
| 447 | //\r | |
| 448 | // Send data to SMM.\r | |
| 449 | //\r | |
| 450 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 6ed1ec59 SZ |
451 | \r |
| 452 | Done:\r | |
| 453 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| 0c18794e | 454 | return Status;\r |
| 455 | }\r | |
| 456 | \r | |
| 457 | \r | |
| 458 | /**\r | |
| 459 | This code returns information about the EFI variables.\r | |
| 460 | \r | |
| 461 | @param[in] Attributes Attributes bitmask to specify the type of variables\r | |
| 462 | on which to return information.\r | |
| 463 | @param[out] MaximumVariableStorageSize Pointer to the maximum size of the storage space available\r | |
| 464 | for the EFI variables associated with the attributes specified.\r | |
| 465 | @param[out] RemainingVariableStorageSize Pointer to the remaining size of the storage space available\r | |
| 466 | for EFI variables associated with the attributes specified.\r | |
| 467 | @param[out] MaximumVariableSize Pointer to the maximum size of an individual EFI variables\r | |
| 468 | associated with the attributes specified.\r | |
| 469 | \r | |
| 470 | @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.\r | |
| 471 | @retval EFI_SUCCESS Query successfully.\r | |
| 472 | @retval EFI_UNSUPPORTED The attribute is not supported on this platform.\r | |
| 473 | \r | |
| 474 | **/\r | |
| 475 | EFI_STATUS\r | |
| 476 | EFIAPI\r | |
| 477 | RuntimeServiceQueryVariableInfo (\r | |
| 478 | IN UINT32 Attributes,\r | |
| 479 | OUT UINT64 *MaximumVariableStorageSize,\r | |
| 480 | OUT UINT64 *RemainingVariableStorageSize,\r | |
| 481 | OUT UINT64 *MaximumVariableSize\r | |
| 482 | )\r | |
| 483 | {\r | |
| 484 | EFI_STATUS Status;\r | |
| 485 | UINTN PayloadSize;\r | |
| 486 | SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *SmmQueryVariableInfo;\r | |
| 487 | \r | |
| 488 | if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {\r | |
| 489 | return EFI_INVALID_PARAMETER;\r | |
| 490 | }\r | |
| 6ed1ec59 SZ |
491 | \r |
| 492 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r | |
| 493 | \r | |
| 0c18794e | 494 | //\r |
| 495 | // Init the communicate buffer. The buffer data size is:\r | |
| 496 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize;\r | |
| 497 | //\r | |
| 498 | PayloadSize = sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);\r | |
| 499 | Status = InitCommunicateBuffer ((VOID **)&SmmQueryVariableInfo, PayloadSize, SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO);\r | |
| 500 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 501 | goto Done;\r |
| 0c18794e | 502 | }\r |
| 503 | ASSERT (SmmQueryVariableInfo != NULL);\r | |
| 504 | \r | |
| 505 | SmmQueryVariableInfo->Attributes = Attributes;\r | |
| 506 | \r | |
| 507 | //\r | |
| 508 | // Send data to SMM.\r | |
| 509 | //\r | |
| 510 | Status = SendCommunicateBuffer (PayloadSize);\r | |
| 511 | if (EFI_ERROR (Status)) {\r | |
| 6ed1ec59 | 512 | goto Done;\r |
| 0c18794e | 513 | }\r |
| 514 | \r | |
| 515 | //\r | |
| 516 | // Get data from SMM.\r | |
| 517 | //\r | |
| 518 | *MaximumVariableSize = SmmQueryVariableInfo->MaximumVariableSize;\r | |
| 519 | *MaximumVariableStorageSize = SmmQueryVariableInfo->MaximumVariableStorageSize;\r | |
| 520 | *RemainingVariableStorageSize = SmmQueryVariableInfo->RemainingVariableStorageSize; \r | |
| 6ed1ec59 SZ |
521 | \r |
| 522 | Done:\r | |
| 523 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
| aab9212f | 524 | return Status;\r |
| 0c18794e | 525 | }\r |
| 526 | \r | |
| 527 | \r | |
| 528 | /**\r | |
| 529 | Exit Boot Services Event notification handler.\r | |
| 530 | \r | |
| 531 | Notify SMM variable driver about the event.\r | |
| 532 | \r | |
| 533 | @param[in] Event Event whose notification function is being invoked.\r | |
| 534 | @param[in] Context Pointer to the notification function's context.\r | |
| 535 | \r | |
| 536 | **/\r | |
| 537 | VOID\r | |
| 538 | EFIAPI\r | |
| 539 | OnExitBootServices (\r | |
| 540 | IN EFI_EVENT Event,\r | |
| 541 | IN VOID *Context\r | |
| 542 | )\r | |
| 543 | {\r | |
| 544 | //\r | |
| 545 | // Init the communicate buffer. The buffer data size is:\r | |
| 546 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
| 547 | //\r | |
| 548 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE); \r | |
| 549 | \r | |
| 550 | //\r | |
| 551 | // Send data to SMM.\r | |
| 552 | //\r | |
| 553 | SendCommunicateBuffer (0);\r | |
| 554 | }\r | |
| 555 | \r | |
| 556 | \r | |
| 557 | /**\r | |
| 558 | On Ready To Boot Services Event notification handler.\r | |
| 559 | \r | |
| 560 | Notify SMM variable driver about the event.\r | |
| 561 | \r | |
| 562 | @param[in] Event Event whose notification function is being invoked\r | |
| 563 | @param[in] Context Pointer to the notification function's context\r | |
| 564 | \r | |
| 565 | **/\r | |
| 566 | VOID\r | |
| 567 | EFIAPI\r | |
| 568 | OnReadyToBoot (\r | |
| 569 | IN EFI_EVENT Event,\r | |
| 570 | IN VOID *Context\r | |
| 571 | )\r | |
| 572 | {\r | |
| 573 | //\r | |
| 574 | // Init the communicate buffer. The buffer data size is:\r | |
| 575 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
| 576 | //\r | |
| 577 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_READY_TO_BOOT);\r | |
| 578 | \r | |
| 579 | //\r | |
| 580 | // Send data to SMM.\r | |
| 581 | //\r | |
| 582 | SendCommunicateBuffer (0);\r | |
| 583 | }\r | |
| 584 | \r | |
| 585 | \r | |
| 586 | /**\r | |
| 587 | Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.\r | |
| 588 | \r | |
| 589 | This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
| 590 | It convers pointer to new virtual address.\r | |
| 591 | \r | |
| 592 | @param[in] Event Event whose notification function is being invoked.\r | |
| 593 | @param[in] Context Pointer to the notification function's context.\r | |
| 594 | \r | |
| 595 | **/\r | |
| 596 | VOID\r | |
| 597 | EFIAPI\r | |
| 598 | VariableAddressChangeEvent (\r | |
| 599 | IN EFI_EVENT Event,\r | |
| 600 | IN VOID *Context\r | |
| 601 | )\r | |
| 602 | {\r | |
| 603 | EfiConvertPointer (0x0, (VOID **) &mVariableBuffer);\r | |
| 604 | EfiConvertPointer (0x0, (VOID **) &mSmmCommunication);\r | |
| 605 | }\r | |
| 606 | \r | |
| 607 | \r | |
| 608 | /**\r | |
| 609 | Initialize variable service and install Variable Architectural protocol.\r | |
| 610 | \r | |
| 611 | @param[in] Event Event whose notification function is being invoked.\r | |
| 612 | @param[in] Context Pointer to the notification function's context.\r | |
| 613 | \r | |
| 614 | **/\r | |
| 615 | VOID\r | |
| 616 | EFIAPI\r | |
| 617 | SmmVariableReady (\r | |
| 618 | IN EFI_EVENT Event,\r | |
| 619 | IN VOID *Context\r | |
| 620 | )\r | |
| 621 | {\r | |
| 622 | EFI_STATUS Status;\r | |
| 623 | \r | |
| 624 | Status = gBS->LocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID **)&mSmmVariable);\r | |
| 625 | if (EFI_ERROR (Status)) {\r | |
| 626 | return;\r | |
| 627 | }\r | |
| 628 | \r | |
| 629 | Status = gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);\r | |
| 630 | ASSERT_EFI_ERROR (Status);\r | |
| 631 | \r | |
| 632 | //\r | |
| 633 | // Allocate memory for variable store.\r | |
| 634 | //\r | |
| 635 | mVariableBufferSize = SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
| 636 | mVariableBufferSize += MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));\r | |
| 637 | mVariableBuffer = AllocateRuntimePool (mVariableBufferSize);\r | |
| 638 | ASSERT (mVariableBuffer != NULL);\r | |
| 639 | \r | |
| 640 | //\r | |
| 641 | // Save the buffer physical address used for SMM conmunication.\r | |
| 642 | //\r | |
| 643 | mVariableBufferPhysical = mVariableBuffer;\r | |
| 644 | \r | |
| 645 | gRT->GetVariable = RuntimeServiceGetVariable;\r | |
| 646 | gRT->GetNextVariableName = RuntimeServiceGetNextVariableName;\r | |
| 647 | gRT->SetVariable = RuntimeServiceSetVariable;\r | |
| 648 | gRT->QueryVariableInfo = RuntimeServiceQueryVariableInfo;\r | |
| 649 | \r | |
| 650 | //\r | |
| 651 | // Install the Variable Architectural Protocol on a new handle.\r | |
| 652 | //\r | |
| 653 | Status = gBS->InstallProtocolInterface (\r | |
| 654 | &mHandle,\r | |
| 655 | &gEfiVariableArchProtocolGuid, \r | |
| 656 | EFI_NATIVE_INTERFACE,\r | |
| 657 | NULL\r | |
| 658 | );\r | |
| 659 | ASSERT_EFI_ERROR (Status);\r | |
| 660 | }\r | |
| 661 | \r | |
| 662 | \r | |
| 663 | /**\r | |
| 664 | SMM Non-Volatile variable write service is ready notify event handler.\r | |
| 665 | \r | |
| 666 | @param[in] Event Event whose notification function is being invoked.\r | |
| 667 | @param[in] Context Pointer to the notification function's context.\r | |
| 668 | \r | |
| 669 | **/\r | |
| 670 | VOID\r | |
| 671 | EFIAPI\r | |
| 672 | SmmVariableWriteReady (\r | |
| 673 | IN EFI_EVENT Event,\r | |
| 674 | IN VOID *Context\r | |
| 675 | )\r | |
| 676 | {\r | |
| 677 | EFI_STATUS Status;\r | |
| 678 | VOID *ProtocolOps;\r | |
| 679 | \r | |
| 680 | //\r | |
| 681 | // Check whether the protocol is installed or not.\r | |
| 682 | //\r | |
| 683 | Status = gBS->LocateProtocol (&gSmmVariableWriteGuid, NULL, (VOID **) &ProtocolOps);\r | |
| 684 | if (EFI_ERROR (Status)) {\r | |
| 685 | return;\r | |
| 686 | }\r | |
| 687 | \r | |
| 688 | Status = gBS->InstallProtocolInterface (\r | |
| 689 | &mHandle,\r | |
| 690 | &gEfiVariableWriteArchProtocolGuid, \r | |
| 691 | EFI_NATIVE_INTERFACE,\r | |
| 692 | NULL\r | |
| 693 | );\r | |
| 694 | ASSERT_EFI_ERROR (Status); \r | |
| 695 | }\r | |
| 696 | \r | |
| 697 | \r | |
| 698 | /**\r | |
| 699 | Variable Driver main entry point. The Variable driver places the 4 EFI\r | |
| 700 | runtime services in the EFI System Table and installs arch protocols \r | |
| 701 | for variable read and write services being available. It also registers\r | |
| 702 | a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
| 703 | \r | |
| 704 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
| 705 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
| 706 | \r | |
| 707 | @retval EFI_SUCCESS Variable service successfully initialized.\r | |
| 708 | \r | |
| 709 | **/\r | |
| 710 | EFI_STATUS\r | |
| 711 | EFIAPI\r | |
| 712 | VariableSmmRuntimeInitialize (\r | |
| 713 | IN EFI_HANDLE ImageHandle,\r | |
| 714 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
| 715 | )\r | |
| 716 | {\r | |
| 717 | VOID *SmmVariableRegistration;\r | |
| 718 | VOID *SmmVariableWriteRegistration;\r | |
| 719 | EFI_EVENT OnReadyToBootEvent;\r | |
| 720 | EFI_EVENT ExitBootServiceEvent;\r | |
| 6ed1ec59 SZ |
721 | \r |
| 722 | EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r | |
| 723 | \r | |
| 0c18794e | 724 | //\r |
| 725 | // Smm variable service is ready\r | |
| 726 | //\r | |
| 727 | EfiCreateProtocolNotifyEvent (\r | |
| 728 | &gEfiSmmVariableProtocolGuid, \r | |
| 729 | TPL_CALLBACK, \r | |
| 730 | SmmVariableReady, \r | |
| 731 | NULL, \r | |
| 732 | &SmmVariableRegistration\r | |
| 733 | );\r | |
| 734 | \r | |
| 735 | //\r | |
| 736 | // Smm Non-Volatile variable write service is ready\r | |
| 737 | //\r | |
| 738 | EfiCreateProtocolNotifyEvent (\r | |
| 739 | &gSmmVariableWriteGuid, \r | |
| 740 | TPL_CALLBACK, \r | |
| 741 | SmmVariableWriteReady, \r | |
| 742 | NULL, \r | |
| 743 | &SmmVariableWriteRegistration\r | |
| 744 | );\r | |
| 745 | \r | |
| 746 | //\r | |
| 747 | // Register the event to reclaim variable for OS usage.\r | |
| 748 | //\r | |
| 749 | EfiCreateEventReadyToBootEx (\r | |
| 750 | TPL_NOTIFY, \r | |
| 751 | OnReadyToBoot, \r | |
| 752 | NULL, \r | |
| 753 | &OnReadyToBootEvent\r | |
| 754 | ); \r | |
| 755 | \r | |
| 756 | //\r | |
| 757 | // Register the event to inform SMM variable that it is at runtime.\r | |
| 758 | //\r | |
| 759 | gBS->CreateEventEx (\r | |
| 760 | EVT_NOTIFY_SIGNAL,\r | |
| 761 | TPL_NOTIFY,\r | |
| 762 | OnExitBootServices,\r | |
| 763 | NULL,\r | |
| 764 | &gEfiEventExitBootServicesGuid,\r | |
| 765 | &ExitBootServiceEvent\r | |
| 766 | ); \r | |
| 767 | \r | |
| 768 | //\r | |
| 769 | // Register the event to convert the pointer for runtime.\r | |
| 770 | //\r | |
| 771 | gBS->CreateEventEx (\r | |
| 772 | EVT_NOTIFY_SIGNAL,\r | |
| 773 | TPL_NOTIFY,\r | |
| 774 | VariableAddressChangeEvent,\r | |
| 775 | NULL,\r | |
| 776 | &gEfiEventVirtualAddressChangeGuid,\r | |
| 777 | &mVirtualAddressChangeEvent\r | |
| 778 | );\r | |
| 779 | \r | |
| 780 | return EFI_SUCCESS;\r | |
| 781 | }\r | |
| 782 | \r |