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1 | /** @file\r | |
2 | UEFI Memory Protection support.\r | |
3 | \r | |
4 | If the UEFI image is page aligned, the image code section is set to read only\r | |
5 | and the image data section is set to non-executable.\r | |
6 | \r | |
7 | 1) This policy is applied for all UEFI image including boot service driver,\r | |
8 | runtime driver or application.\r | |
9 | 2) This policy is applied only if the UEFI image meets the page alignment\r | |
10 | requirement.\r | |
11 | 3) This policy is applied only if the Source UEFI image matches the\r | |
12 | PcdImageProtectionPolicy definition.\r | |
13 | 4) This policy is not applied to the non-PE image region.\r | |
14 | \r | |
15 | The DxeCore calls CpuArchProtocol->SetMemoryAttributes() to protect\r | |
16 | the image. If the CpuArch protocol is not installed yet, the DxeCore\r | |
17 | enqueues the protection request. Once the CpuArch is installed, the\r | |
18 | DxeCore dequeues the protection request and applies policy.\r | |
19 | \r | |
20 | Once the image is unloaded, the protection is removed automatically.\r | |
21 | \r | |
22 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r | |
23 | This program and the accompanying materials\r | |
24 | are licensed and made available under the terms and conditions of the BSD License\r | |
25 | which accompanies this distribution. The full text of the license may be found at\r | |
26 | http://opensource.org/licenses/bsd-license.php\r | |
27 | \r | |
28 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
29 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
30 | \r | |
31 | **/\r | |
32 | \r | |
33 | #include <PiDxe.h>\r | |
34 | #include <Library/BaseLib.h>\r | |
35 | #include <Library/BaseMemoryLib.h>\r | |
36 | #include <Library/MemoryAllocationLib.h>\r | |
37 | #include <Library/UefiBootServicesTableLib.h>\r | |
38 | #include <Library/DxeServicesTableLib.h>\r | |
39 | #include <Library/DebugLib.h>\r | |
40 | #include <Library/UefiLib.h>\r | |
41 | \r | |
42 | #include <Guid/EventGroup.h>\r | |
43 | #include <Guid/MemoryAttributesTable.h>\r | |
44 | #include <Guid/PropertiesTable.h>\r | |
45 | \r | |
46 | #include <Protocol/FirmwareVolume2.h>\r | |
47 | #include <Protocol/BlockIo.h>\r | |
48 | #include <Protocol/SimpleFileSystem.h>\r | |
49 | \r | |
50 | #include "DxeMain.h"\r | |
51 | \r | |
52 | #define CACHE_ATTRIBUTE_MASK (EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT | EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_WP)\r | |
53 | #define MEMORY_ATTRIBUTE_MASK (EFI_MEMORY_RP | EFI_MEMORY_XP | EFI_MEMORY_RO)\r | |
54 | \r | |
55 | //\r | |
56 | // Image type definitions\r | |
57 | //\r | |
58 | #define IMAGE_UNKNOWN 0x00000001\r | |
59 | #define IMAGE_FROM_FV 0x00000002\r | |
60 | \r | |
61 | //\r | |
62 | // Protection policy bit definition\r | |
63 | //\r | |
64 | #define DO_NOT_PROTECT 0x00000000\r | |
65 | #define PROTECT_IF_ALIGNED_ELSE_ALLOW 0x00000001\r | |
66 | \r | |
67 | #define MEMORY_TYPE_OS_RESERVED_MIN 0x80000000\r | |
68 | #define MEMORY_TYPE_OEM_RESERVED_MIN 0x70000000\r | |
69 | \r | |
70 | #define PREVIOUS_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r | |
71 | ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) - (Size)))\r | |
72 | \r | |
73 | UINT32 mImageProtectionPolicy;\r | |
74 | \r | |
75 | extern LIST_ENTRY mGcdMemorySpaceMap;\r | |
76 | \r | |
77 | /**\r | |
78 | Sort code section in image record, based upon CodeSegmentBase from low to high.\r | |
79 | \r | |
80 | @param ImageRecord image record to be sorted\r | |
81 | **/\r | |
82 | VOID\r | |
83 | SortImageRecordCodeSection (\r | |
84 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
85 | );\r | |
86 | \r | |
87 | /**\r | |
88 | Check if code section in image record is valid.\r | |
89 | \r | |
90 | @param ImageRecord image record to be checked\r | |
91 | \r | |
92 | @retval TRUE image record is valid\r | |
93 | @retval FALSE image record is invalid\r | |
94 | **/\r | |
95 | BOOLEAN\r | |
96 | IsImageRecordCodeSectionValid (\r | |
97 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
98 | );\r | |
99 | \r | |
100 | /**\r | |
101 | Get the image type.\r | |
102 | \r | |
103 | @param[in] File This is a pointer to the device path of the file that is\r | |
104 | being dispatched.\r | |
105 | \r | |
106 | @return UINT32 Image Type\r | |
107 | **/\r | |
108 | UINT32\r | |
109 | GetImageType (\r | |
110 | IN CONST EFI_DEVICE_PATH_PROTOCOL *File\r | |
111 | )\r | |
112 | {\r | |
113 | EFI_STATUS Status;\r | |
114 | EFI_HANDLE DeviceHandle;\r | |
115 | EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;\r | |
116 | \r | |
117 | if (File == NULL) {\r | |
118 | return IMAGE_UNKNOWN;\r | |
119 | }\r | |
120 | \r | |
121 | //\r | |
122 | // First check to see if File is from a Firmware Volume\r | |
123 | //\r | |
124 | DeviceHandle = NULL;\r | |
125 | TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *) File;\r | |
126 | Status = gBS->LocateDevicePath (\r | |
127 | &gEfiFirmwareVolume2ProtocolGuid,\r | |
128 | &TempDevicePath,\r | |
129 | &DeviceHandle\r | |
130 | );\r | |
131 | if (!EFI_ERROR (Status)) {\r | |
132 | Status = gBS->OpenProtocol (\r | |
133 | DeviceHandle,\r | |
134 | &gEfiFirmwareVolume2ProtocolGuid,\r | |
135 | NULL,\r | |
136 | NULL,\r | |
137 | NULL,\r | |
138 | EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r | |
139 | );\r | |
140 | if (!EFI_ERROR (Status)) {\r | |
141 | return IMAGE_FROM_FV;\r | |
142 | }\r | |
143 | }\r | |
144 | return IMAGE_UNKNOWN;\r | |
145 | }\r | |
146 | \r | |
147 | /**\r | |
148 | Get UEFI image protection policy based upon image type.\r | |
149 | \r | |
150 | @param[in] ImageType The UEFI image type\r | |
151 | \r | |
152 | @return UEFI image protection policy\r | |
153 | **/\r | |
154 | UINT32\r | |
155 | GetProtectionPolicyFromImageType (\r | |
156 | IN UINT32 ImageType\r | |
157 | )\r | |
158 | {\r | |
159 | if ((ImageType & mImageProtectionPolicy) == 0) {\r | |
160 | return DO_NOT_PROTECT;\r | |
161 | } else {\r | |
162 | return PROTECT_IF_ALIGNED_ELSE_ALLOW;\r | |
163 | }\r | |
164 | }\r | |
165 | \r | |
166 | /**\r | |
167 | Get UEFI image protection policy based upon loaded image device path.\r | |
168 | \r | |
169 | @param[in] LoadedImage The loaded image protocol\r | |
170 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
171 | \r | |
172 | @return UEFI image protection policy\r | |
173 | **/\r | |
174 | UINT32\r | |
175 | GetUefiImageProtectionPolicy (\r | |
176 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
177 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
178 | )\r | |
179 | {\r | |
180 | BOOLEAN InSmm;\r | |
181 | UINT32 ImageType;\r | |
182 | UINT32 ProtectionPolicy;\r | |
183 | \r | |
184 | //\r | |
185 | // Check SMM\r | |
186 | //\r | |
187 | InSmm = FALSE;\r | |
188 | if (gSmmBase2 != NULL) {\r | |
189 | gSmmBase2->InSmm (gSmmBase2, &InSmm);\r | |
190 | }\r | |
191 | if (InSmm) {\r | |
192 | return FALSE;\r | |
193 | }\r | |
194 | \r | |
195 | //\r | |
196 | // Check DevicePath\r | |
197 | //\r | |
198 | if (LoadedImage == gDxeCoreLoadedImage) {\r | |
199 | ImageType = IMAGE_FROM_FV;\r | |
200 | } else {\r | |
201 | ImageType = GetImageType (LoadedImageDevicePath);\r | |
202 | }\r | |
203 | ProtectionPolicy = GetProtectionPolicyFromImageType (ImageType);\r | |
204 | return ProtectionPolicy;\r | |
205 | }\r | |
206 | \r | |
207 | \r | |
208 | /**\r | |
209 | Set UEFI image memory attributes.\r | |
210 | \r | |
211 | @param[in] BaseAddress Specified start address\r | |
212 | @param[in] Length Specified length\r | |
213 | @param[in] Attributes Specified attributes\r | |
214 | **/\r | |
215 | VOID\r | |
216 | SetUefiImageMemoryAttributes (\r | |
217 | IN UINT64 BaseAddress,\r | |
218 | IN UINT64 Length,\r | |
219 | IN UINT64 Attributes\r | |
220 | )\r | |
221 | {\r | |
222 | EFI_STATUS Status;\r | |
223 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor;\r | |
224 | UINT64 FinalAttributes;\r | |
225 | \r | |
226 | Status = CoreGetMemorySpaceDescriptor(BaseAddress, &Descriptor);\r | |
227 | ASSERT_EFI_ERROR(Status);\r | |
228 | \r | |
229 | FinalAttributes = (Descriptor.Attributes & CACHE_ATTRIBUTE_MASK) | (Attributes & MEMORY_ATTRIBUTE_MASK);\r | |
230 | \r | |
231 | DEBUG ((DEBUG_INFO, "SetUefiImageMemoryAttributes - 0x%016lx - 0x%016lx (0x%016lx)\n", BaseAddress, Length, FinalAttributes));\r | |
232 | \r | |
233 | ASSERT(gCpu != NULL);\r | |
234 | gCpu->SetMemoryAttributes (gCpu, BaseAddress, Length, FinalAttributes);\r | |
235 | }\r | |
236 | \r | |
237 | /**\r | |
238 | Set UEFI image protection attributes.\r | |
239 | \r | |
240 | @param[in] ImageRecord A UEFI image record\r | |
241 | @param[in] Protect TRUE: Protect the UEFI image.\r | |
242 | FALSE: Unprotect the UEFI image.\r | |
243 | **/\r | |
244 | VOID\r | |
245 | SetUefiImageProtectionAttributes (\r | |
246 | IN IMAGE_PROPERTIES_RECORD *ImageRecord,\r | |
247 | IN BOOLEAN Protect\r | |
248 | )\r | |
249 | {\r | |
250 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
251 | LIST_ENTRY *ImageRecordCodeSectionLink;\r | |
252 | LIST_ENTRY *ImageRecordCodeSectionEndLink;\r | |
253 | LIST_ENTRY *ImageRecordCodeSectionList;\r | |
254 | UINT64 CurrentBase;\r | |
255 | UINT64 ImageEnd;\r | |
256 | UINT64 Attribute;\r | |
257 | \r | |
258 | ImageRecordCodeSectionList = &ImageRecord->CodeSegmentList;\r | |
259 | \r | |
260 | CurrentBase = ImageRecord->ImageBase;\r | |
261 | ImageEnd = ImageRecord->ImageBase + ImageRecord->ImageSize;\r | |
262 | \r | |
263 | ImageRecordCodeSectionLink = ImageRecordCodeSectionList->ForwardLink;\r | |
264 | ImageRecordCodeSectionEndLink = ImageRecordCodeSectionList;\r | |
265 | while (ImageRecordCodeSectionLink != ImageRecordCodeSectionEndLink) {\r | |
266 | ImageRecordCodeSection = CR (\r | |
267 | ImageRecordCodeSectionLink,\r | |
268 | IMAGE_PROPERTIES_RECORD_CODE_SECTION,\r | |
269 | Link,\r | |
270 | IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE\r | |
271 | );\r | |
272 | ImageRecordCodeSectionLink = ImageRecordCodeSectionLink->ForwardLink;\r | |
273 | \r | |
274 | ASSERT (CurrentBase <= ImageRecordCodeSection->CodeSegmentBase);\r | |
275 | if (CurrentBase < ImageRecordCodeSection->CodeSegmentBase) {\r | |
276 | //\r | |
277 | // DATA\r | |
278 | //\r | |
279 | if (Protect) {\r | |
280 | Attribute = EFI_MEMORY_XP;\r | |
281 | } else {\r | |
282 | Attribute = 0;\r | |
283 | }\r | |
284 | SetUefiImageMemoryAttributes (\r | |
285 | CurrentBase,\r | |
286 | ImageRecordCodeSection->CodeSegmentBase - CurrentBase,\r | |
287 | Attribute\r | |
288 | );\r | |
289 | }\r | |
290 | //\r | |
291 | // CODE\r | |
292 | //\r | |
293 | if (Protect) {\r | |
294 | Attribute = EFI_MEMORY_RO;\r | |
295 | } else {\r | |
296 | Attribute = 0;\r | |
297 | }\r | |
298 | SetUefiImageMemoryAttributes (\r | |
299 | ImageRecordCodeSection->CodeSegmentBase,\r | |
300 | ImageRecordCodeSection->CodeSegmentSize,\r | |
301 | Attribute\r | |
302 | );\r | |
303 | CurrentBase = ImageRecordCodeSection->CodeSegmentBase + ImageRecordCodeSection->CodeSegmentSize;\r | |
304 | }\r | |
305 | //\r | |
306 | // Last DATA\r | |
307 | //\r | |
308 | ASSERT (CurrentBase <= ImageEnd);\r | |
309 | if (CurrentBase < ImageEnd) {\r | |
310 | //\r | |
311 | // DATA\r | |
312 | //\r | |
313 | if (Protect) {\r | |
314 | Attribute = EFI_MEMORY_XP;\r | |
315 | } else {\r | |
316 | Attribute = 0;\r | |
317 | }\r | |
318 | SetUefiImageMemoryAttributes (\r | |
319 | CurrentBase,\r | |
320 | ImageEnd - CurrentBase,\r | |
321 | Attribute\r | |
322 | );\r | |
323 | }\r | |
324 | return ;\r | |
325 | }\r | |
326 | \r | |
327 | /**\r | |
328 | Return if the PE image section is aligned.\r | |
329 | \r | |
330 | @param[in] SectionAlignment PE/COFF section alignment\r | |
331 | @param[in] MemoryType PE/COFF image memory type\r | |
332 | \r | |
333 | @retval TRUE The PE image section is aligned.\r | |
334 | @retval FALSE The PE image section is not aligned.\r | |
335 | **/\r | |
336 | BOOLEAN\r | |
337 | IsMemoryProtectionSectionAligned (\r | |
338 | IN UINT32 SectionAlignment,\r | |
339 | IN EFI_MEMORY_TYPE MemoryType\r | |
340 | )\r | |
341 | {\r | |
342 | UINT32 PageAlignment;\r | |
343 | \r | |
344 | switch (MemoryType) {\r | |
345 | case EfiRuntimeServicesCode:\r | |
346 | case EfiACPIMemoryNVS:\r | |
347 | PageAlignment = RUNTIME_PAGE_ALLOCATION_GRANULARITY;\r | |
348 | break;\r | |
349 | case EfiRuntimeServicesData:\r | |
350 | case EfiACPIReclaimMemory:\r | |
351 | ASSERT (FALSE);\r | |
352 | PageAlignment = RUNTIME_PAGE_ALLOCATION_GRANULARITY;\r | |
353 | break;\r | |
354 | case EfiBootServicesCode:\r | |
355 | case EfiLoaderCode:\r | |
356 | case EfiReservedMemoryType:\r | |
357 | PageAlignment = EFI_PAGE_SIZE;\r | |
358 | break;\r | |
359 | default:\r | |
360 | ASSERT (FALSE);\r | |
361 | PageAlignment = EFI_PAGE_SIZE;\r | |
362 | break;\r | |
363 | }\r | |
364 | \r | |
365 | if ((SectionAlignment & (PageAlignment - 1)) != 0) {\r | |
366 | return FALSE;\r | |
367 | } else {\r | |
368 | return TRUE;\r | |
369 | }\r | |
370 | }\r | |
371 | \r | |
372 | /**\r | |
373 | Free Image record.\r | |
374 | \r | |
375 | @param[in] ImageRecord A UEFI image record\r | |
376 | **/\r | |
377 | VOID\r | |
378 | FreeImageRecord (\r | |
379 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
380 | )\r | |
381 | {\r | |
382 | LIST_ENTRY *CodeSegmentListHead;\r | |
383 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
384 | \r | |
385 | CodeSegmentListHead = &ImageRecord->CodeSegmentList;\r | |
386 | while (!IsListEmpty (CodeSegmentListHead)) {\r | |
387 | ImageRecordCodeSection = CR (\r | |
388 | CodeSegmentListHead->ForwardLink,\r | |
389 | IMAGE_PROPERTIES_RECORD_CODE_SECTION,\r | |
390 | Link,\r | |
391 | IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE\r | |
392 | );\r | |
393 | RemoveEntryList (&ImageRecordCodeSection->Link);\r | |
394 | FreePool (ImageRecordCodeSection);\r | |
395 | }\r | |
396 | \r | |
397 | if (ImageRecord->Link.ForwardLink != NULL) {\r | |
398 | RemoveEntryList (&ImageRecord->Link);\r | |
399 | }\r | |
400 | FreePool (ImageRecord);\r | |
401 | }\r | |
402 | \r | |
403 | /**\r | |
404 | Protect or unprotect UEFI image common function.\r | |
405 | \r | |
406 | @param[in] LoadedImage The loaded image protocol\r | |
407 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
408 | @param[in] Protect TRUE: Protect the UEFI image.\r | |
409 | FALSE: Unprotect the UEFI image.\r | |
410 | **/\r | |
411 | VOID\r | |
412 | ProtectUefiImageCommon (\r | |
413 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
414 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath,\r | |
415 | IN BOOLEAN Protect\r | |
416 | )\r | |
417 | {\r | |
418 | VOID *ImageAddress;\r | |
419 | EFI_IMAGE_DOS_HEADER *DosHdr;\r | |
420 | UINT32 PeCoffHeaderOffset;\r | |
421 | UINT32 SectionAlignment;\r | |
422 | EFI_IMAGE_SECTION_HEADER *Section;\r | |
423 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r | |
424 | UINT8 *Name;\r | |
425 | UINTN Index;\r | |
426 | IMAGE_PROPERTIES_RECORD *ImageRecord;\r | |
427 | CHAR8 *PdbPointer;\r | |
428 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
429 | UINT16 Magic;\r | |
430 | BOOLEAN IsAligned;\r | |
431 | UINT32 ProtectionPolicy;\r | |
432 | \r | |
433 | DEBUG ((DEBUG_INFO, "ProtectUefiImageCommon - 0x%x\n", LoadedImage));\r | |
434 | DEBUG ((DEBUG_INFO, " - 0x%016lx - 0x%016lx\n", (EFI_PHYSICAL_ADDRESS)(UINTN)LoadedImage->ImageBase, LoadedImage->ImageSize));\r | |
435 | \r | |
436 | if (gCpu == NULL) {\r | |
437 | return ;\r | |
438 | }\r | |
439 | \r | |
440 | ProtectionPolicy = GetUefiImageProtectionPolicy (LoadedImage, LoadedImageDevicePath);\r | |
441 | switch (ProtectionPolicy) {\r | |
442 | case DO_NOT_PROTECT:\r | |
443 | return ;\r | |
444 | case PROTECT_IF_ALIGNED_ELSE_ALLOW:\r | |
445 | break;\r | |
446 | default:\r | |
447 | ASSERT(FALSE);\r | |
448 | return ;\r | |
449 | }\r | |
450 | \r | |
451 | ImageRecord = AllocateZeroPool (sizeof(*ImageRecord));\r | |
452 | if (ImageRecord == NULL) {\r | |
453 | return ;\r | |
454 | }\r | |
455 | ImageRecord->Signature = IMAGE_PROPERTIES_RECORD_SIGNATURE;\r | |
456 | \r | |
457 | //\r | |
458 | // Step 1: record whole region\r | |
459 | //\r | |
460 | ImageRecord->ImageBase = (EFI_PHYSICAL_ADDRESS)(UINTN)LoadedImage->ImageBase;\r | |
461 | ImageRecord->ImageSize = LoadedImage->ImageSize;\r | |
462 | \r | |
463 | ImageAddress = LoadedImage->ImageBase;\r | |
464 | \r | |
465 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
466 | if (PdbPointer != NULL) {\r | |
467 | DEBUG ((DEBUG_VERBOSE, " Image - %a\n", PdbPointer));\r | |
468 | }\r | |
469 | \r | |
470 | //\r | |
471 | // Check PE/COFF image\r | |
472 | //\r | |
473 | DosHdr = (EFI_IMAGE_DOS_HEADER *) (UINTN) ImageAddress;\r | |
474 | PeCoffHeaderOffset = 0;\r | |
475 | if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {\r | |
476 | PeCoffHeaderOffset = DosHdr->e_lfanew;\r | |
477 | }\r | |
478 | \r | |
479 | Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset);\r | |
480 | if (Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {\r | |
481 | DEBUG ((DEBUG_VERBOSE, "Hdr.Pe32->Signature invalid - 0x%x\n", Hdr.Pe32->Signature));\r | |
482 | // It might be image in SMM.\r | |
483 | goto Finish;\r | |
484 | }\r | |
485 | \r | |
486 | //\r | |
487 | // Get SectionAlignment\r | |
488 | //\r | |
489 | if (Hdr.Pe32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64 && Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r | |
490 | //\r | |
491 | // NOTE: Some versions of Linux ELILO for Itanium have an incorrect magic value\r | |
492 | // in the PE/COFF Header. If the MachineType is Itanium(IA64) and the\r | |
493 | // Magic value in the OptionalHeader is EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC\r | |
494 | // then override the magic value to EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC\r | |
495 | //\r | |
496 | Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;\r | |
497 | } else {\r | |
498 | //\r | |
499 | // Get the magic value from the PE/COFF Optional Header\r | |
500 | //\r | |
501 | Magic = Hdr.Pe32->OptionalHeader.Magic;\r | |
502 | }\r | |
503 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r | |
504 | SectionAlignment = Hdr.Pe32->OptionalHeader.SectionAlignment;\r | |
505 | } else {\r | |
506 | SectionAlignment = Hdr.Pe32Plus->OptionalHeader.SectionAlignment;\r | |
507 | }\r | |
508 | \r | |
509 | IsAligned = IsMemoryProtectionSectionAligned (SectionAlignment, LoadedImage->ImageCodeType);\r | |
510 | if (!IsAligned) {\r | |
511 | DEBUG ((DEBUG_VERBOSE, "!!!!!!!! ProtectUefiImageCommon - Section Alignment(0x%x) is incorrect !!!!!!!!\n",\r | |
512 | SectionAlignment));\r | |
513 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
514 | if (PdbPointer != NULL) {\r | |
515 | DEBUG ((DEBUG_VERBOSE, "!!!!!!!! Image - %a !!!!!!!!\n", PdbPointer));\r | |
516 | }\r | |
517 | goto Finish;\r | |
518 | }\r | |
519 | \r | |
520 | Section = (EFI_IMAGE_SECTION_HEADER *) (\r | |
521 | (UINT8 *) (UINTN) ImageAddress +\r | |
522 | PeCoffHeaderOffset +\r | |
523 | sizeof(UINT32) +\r | |
524 | sizeof(EFI_IMAGE_FILE_HEADER) +\r | |
525 | Hdr.Pe32->FileHeader.SizeOfOptionalHeader\r | |
526 | );\r | |
527 | ImageRecord->CodeSegmentCount = 0;\r | |
528 | InitializeListHead (&ImageRecord->CodeSegmentList);\r | |
529 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r | |
530 | Name = Section[Index].Name;\r | |
531 | DEBUG ((\r | |
532 | DEBUG_VERBOSE,\r | |
533 | " Section - '%c%c%c%c%c%c%c%c'\n",\r | |
534 | Name[0],\r | |
535 | Name[1],\r | |
536 | Name[2],\r | |
537 | Name[3],\r | |
538 | Name[4],\r | |
539 | Name[5],\r | |
540 | Name[6],\r | |
541 | Name[7]\r | |
542 | ));\r | |
543 | \r | |
544 | //\r | |
545 | // Instead of assuming that a PE/COFF section of type EFI_IMAGE_SCN_CNT_CODE\r | |
546 | // can always be mapped read-only, classify a section as a code section only\r | |
547 | // if it has the executable attribute set and the writable attribute cleared.\r | |
548 | //\r | |
549 | // This adheres more closely to the PE/COFF spec, and avoids issues with\r | |
550 | // Linux OS loaders that may consist of a single read/write/execute section.\r | |
551 | //\r | |
552 | if ((Section[Index].Characteristics & (EFI_IMAGE_SCN_MEM_WRITE | EFI_IMAGE_SCN_MEM_EXECUTE)) == EFI_IMAGE_SCN_MEM_EXECUTE) {\r | |
553 | DEBUG ((DEBUG_VERBOSE, " VirtualSize - 0x%08x\n", Section[Index].Misc.VirtualSize));\r | |
554 | DEBUG ((DEBUG_VERBOSE, " VirtualAddress - 0x%08x\n", Section[Index].VirtualAddress));\r | |
555 | DEBUG ((DEBUG_VERBOSE, " SizeOfRawData - 0x%08x\n", Section[Index].SizeOfRawData));\r | |
556 | DEBUG ((DEBUG_VERBOSE, " PointerToRawData - 0x%08x\n", Section[Index].PointerToRawData));\r | |
557 | DEBUG ((DEBUG_VERBOSE, " PointerToRelocations - 0x%08x\n", Section[Index].PointerToRelocations));\r | |
558 | DEBUG ((DEBUG_VERBOSE, " PointerToLinenumbers - 0x%08x\n", Section[Index].PointerToLinenumbers));\r | |
559 | DEBUG ((DEBUG_VERBOSE, " NumberOfRelocations - 0x%08x\n", Section[Index].NumberOfRelocations));\r | |
560 | DEBUG ((DEBUG_VERBOSE, " NumberOfLinenumbers - 0x%08x\n", Section[Index].NumberOfLinenumbers));\r | |
561 | DEBUG ((DEBUG_VERBOSE, " Characteristics - 0x%08x\n", Section[Index].Characteristics));\r | |
562 | \r | |
563 | //\r | |
564 | // Step 2: record code section\r | |
565 | //\r | |
566 | ImageRecordCodeSection = AllocatePool (sizeof(*ImageRecordCodeSection));\r | |
567 | if (ImageRecordCodeSection == NULL) {\r | |
568 | return ;\r | |
569 | }\r | |
570 | ImageRecordCodeSection->Signature = IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE;\r | |
571 | \r | |
572 | ImageRecordCodeSection->CodeSegmentBase = (UINTN)ImageAddress + Section[Index].VirtualAddress;\r | |
573 | ImageRecordCodeSection->CodeSegmentSize = ALIGN_VALUE(Section[Index].SizeOfRawData, SectionAlignment);\r | |
574 | \r | |
575 | DEBUG ((DEBUG_VERBOSE, "ImageCode: 0x%016lx - 0x%016lx\n", ImageRecordCodeSection->CodeSegmentBase, ImageRecordCodeSection->CodeSegmentSize));\r | |
576 | \r | |
577 | InsertTailList (&ImageRecord->CodeSegmentList, &ImageRecordCodeSection->Link);\r | |
578 | ImageRecord->CodeSegmentCount++;\r | |
579 | }\r | |
580 | }\r | |
581 | \r | |
582 | if (ImageRecord->CodeSegmentCount == 0) {\r | |
583 | DEBUG ((DEBUG_ERROR, "!!!!!!!! ProtectUefiImageCommon - CodeSegmentCount is 0 !!!!!!!!\n"));\r | |
584 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
585 | if (PdbPointer != NULL) {\r | |
586 | DEBUG ((DEBUG_ERROR, "!!!!!!!! Image - %a !!!!!!!!\n", PdbPointer));\r | |
587 | }\r | |
588 | goto Finish;\r | |
589 | }\r | |
590 | \r | |
591 | //\r | |
592 | // Final\r | |
593 | //\r | |
594 | SortImageRecordCodeSection (ImageRecord);\r | |
595 | //\r | |
596 | // Check overlap all section in ImageBase/Size\r | |
597 | //\r | |
598 | if (!IsImageRecordCodeSectionValid (ImageRecord)) {\r | |
599 | DEBUG ((DEBUG_ERROR, "IsImageRecordCodeSectionValid - FAIL\n"));\r | |
600 | goto Finish;\r | |
601 | }\r | |
602 | \r | |
603 | //\r | |
604 | // Round up the ImageSize, some CPU arch may return EFI_UNSUPPORTED if ImageSize is not aligned.\r | |
605 | // Given that the loader always allocates full pages, we know the space after the image is not used.\r | |
606 | //\r | |
607 | ImageRecord->ImageSize = ALIGN_VALUE(LoadedImage->ImageSize, EFI_PAGE_SIZE);\r | |
608 | \r | |
609 | //\r | |
610 | // CPU ARCH present. Update memory attribute directly.\r | |
611 | //\r | |
612 | SetUefiImageProtectionAttributes (ImageRecord, Protect);\r | |
613 | \r | |
614 | //\r | |
615 | // Clean up\r | |
616 | //\r | |
617 | FreeImageRecord (ImageRecord);\r | |
618 | \r | |
619 | Finish:\r | |
620 | return ;\r | |
621 | }\r | |
622 | \r | |
623 | /**\r | |
624 | Protect UEFI image.\r | |
625 | \r | |
626 | @param[in] LoadedImage The loaded image protocol\r | |
627 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
628 | **/\r | |
629 | VOID\r | |
630 | ProtectUefiImage (\r | |
631 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
632 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
633 | )\r | |
634 | {\r | |
635 | if (PcdGet32(PcdImageProtectionPolicy) != 0) {\r | |
636 | ProtectUefiImageCommon (LoadedImage, LoadedImageDevicePath, TRUE);\r | |
637 | }\r | |
638 | }\r | |
639 | \r | |
640 | /**\r | |
641 | Unprotect UEFI image.\r | |
642 | \r | |
643 | @param[in] LoadedImage The loaded image protocol\r | |
644 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
645 | **/\r | |
646 | VOID\r | |
647 | UnprotectUefiImage (\r | |
648 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
649 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
650 | )\r | |
651 | {\r | |
652 | if (PcdGet32(PcdImageProtectionPolicy) != 0) {\r | |
653 | ProtectUefiImageCommon (LoadedImage, LoadedImageDevicePath, FALSE);\r | |
654 | }\r | |
655 | }\r | |
656 | \r | |
657 | /**\r | |
658 | Return the EFI memory permission attribute associated with memory\r | |
659 | type 'MemoryType' under the configured DXE memory protection policy.\r | |
660 | **/\r | |
661 | STATIC\r | |
662 | UINT64\r | |
663 | GetPermissionAttributeForMemoryType (\r | |
664 | IN EFI_MEMORY_TYPE MemoryType\r | |
665 | )\r | |
666 | {\r | |
667 | UINT64 TestBit;\r | |
668 | \r | |
669 | if ((UINT32)MemoryType >= MEMORY_TYPE_OS_RESERVED_MIN) {\r | |
670 | TestBit = BIT63;\r | |
671 | } else if ((UINT32)MemoryType >= MEMORY_TYPE_OEM_RESERVED_MIN) {\r | |
672 | TestBit = BIT62;\r | |
673 | } else {\r | |
674 | TestBit = LShiftU64 (1, MemoryType);\r | |
675 | }\r | |
676 | \r | |
677 | if ((PcdGet64 (PcdDxeNxMemoryProtectionPolicy) & TestBit) != 0) {\r | |
678 | return EFI_MEMORY_XP;\r | |
679 | } else {\r | |
680 | return 0;\r | |
681 | }\r | |
682 | }\r | |
683 | \r | |
684 | /**\r | |
685 | Sort memory map entries based upon PhysicalStart, from low to high.\r | |
686 | \r | |
687 | @param MemoryMap A pointer to the buffer in which firmware places\r | |
688 | the current memory map.\r | |
689 | @param MemoryMapSize Size, in bytes, of the MemoryMap buffer.\r | |
690 | @param DescriptorSize Size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r | |
691 | **/\r | |
692 | STATIC\r | |
693 | VOID\r | |
694 | SortMemoryMap (\r | |
695 | IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,\r | |
696 | IN UINTN MemoryMapSize,\r | |
697 | IN UINTN DescriptorSize\r | |
698 | )\r | |
699 | {\r | |
700 | EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r | |
701 | EFI_MEMORY_DESCRIPTOR *NextMemoryMapEntry;\r | |
702 | EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r | |
703 | EFI_MEMORY_DESCRIPTOR TempMemoryMap;\r | |
704 | \r | |
705 | MemoryMapEntry = MemoryMap;\r | |
706 | NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
707 | MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);\r | |
708 | while (MemoryMapEntry < MemoryMapEnd) {\r | |
709 | while (NextMemoryMapEntry < MemoryMapEnd) {\r | |
710 | if (MemoryMapEntry->PhysicalStart > NextMemoryMapEntry->PhysicalStart) {\r | |
711 | CopyMem (&TempMemoryMap, MemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r | |
712 | CopyMem (MemoryMapEntry, NextMemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r | |
713 | CopyMem (NextMemoryMapEntry, &TempMemoryMap, sizeof(EFI_MEMORY_DESCRIPTOR));\r | |
714 | }\r | |
715 | \r | |
716 | NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r | |
717 | }\r | |
718 | \r | |
719 | MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
720 | NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
721 | }\r | |
722 | }\r | |
723 | \r | |
724 | /**\r | |
725 | Merge adjacent memory map entries if they use the same memory protection policy\r | |
726 | \r | |
727 | @param[in, out] MemoryMap A pointer to the buffer in which firmware places\r | |
728 | the current memory map.\r | |
729 | @param[in, out] MemoryMapSize A pointer to the size, in bytes, of the\r | |
730 | MemoryMap buffer. On input, this is the size of\r | |
731 | the current memory map. On output,\r | |
732 | it is the size of new memory map after merge.\r | |
733 | @param[in] DescriptorSize Size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r | |
734 | **/\r | |
735 | STATIC\r | |
736 | VOID\r | |
737 | MergeMemoryMapForProtectionPolicy (\r | |
738 | IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,\r | |
739 | IN OUT UINTN *MemoryMapSize,\r | |
740 | IN UINTN DescriptorSize\r | |
741 | )\r | |
742 | {\r | |
743 | EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r | |
744 | EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r | |
745 | UINT64 MemoryBlockLength;\r | |
746 | EFI_MEMORY_DESCRIPTOR *NewMemoryMapEntry;\r | |
747 | EFI_MEMORY_DESCRIPTOR *NextMemoryMapEntry;\r | |
748 | UINT64 Attributes;\r | |
749 | \r | |
750 | SortMemoryMap (MemoryMap, *MemoryMapSize, DescriptorSize);\r | |
751 | \r | |
752 | MemoryMapEntry = MemoryMap;\r | |
753 | NewMemoryMapEntry = MemoryMap;\r | |
754 | MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + *MemoryMapSize);\r | |
755 | while ((UINTN)MemoryMapEntry < (UINTN)MemoryMapEnd) {\r | |
756 | CopyMem (NewMemoryMapEntry, MemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r | |
757 | NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
758 | \r | |
759 | do {\r | |
760 | MemoryBlockLength = (UINT64) (EFI_PAGES_TO_SIZE((UINTN)MemoryMapEntry->NumberOfPages));\r | |
761 | Attributes = GetPermissionAttributeForMemoryType (MemoryMapEntry->Type);\r | |
762 | \r | |
763 | if (((UINTN)NextMemoryMapEntry < (UINTN)MemoryMapEnd) &&\r | |
764 | Attributes == GetPermissionAttributeForMemoryType (NextMemoryMapEntry->Type) &&\r | |
765 | ((MemoryMapEntry->PhysicalStart + MemoryBlockLength) == NextMemoryMapEntry->PhysicalStart)) {\r | |
766 | MemoryMapEntry->NumberOfPages += NextMemoryMapEntry->NumberOfPages;\r | |
767 | if (NewMemoryMapEntry != MemoryMapEntry) {\r | |
768 | NewMemoryMapEntry->NumberOfPages += NextMemoryMapEntry->NumberOfPages;\r | |
769 | }\r | |
770 | \r | |
771 | NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r | |
772 | continue;\r | |
773 | } else {\r | |
774 | MemoryMapEntry = PREVIOUS_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r | |
775 | break;\r | |
776 | }\r | |
777 | } while (TRUE);\r | |
778 | \r | |
779 | MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
780 | NewMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NewMemoryMapEntry, DescriptorSize);\r | |
781 | }\r | |
782 | \r | |
783 | *MemoryMapSize = (UINTN)NewMemoryMapEntry - (UINTN)MemoryMap;\r | |
784 | \r | |
785 | return ;\r | |
786 | }\r | |
787 | \r | |
788 | \r | |
789 | /**\r | |
790 | Remove exec permissions from all regions whose type is identified by\r | |
791 | PcdDxeNxMemoryProtectionPolicy\r | |
792 | **/\r | |
793 | STATIC\r | |
794 | VOID\r | |
795 | InitializeDxeNxMemoryProtectionPolicy (\r | |
796 | VOID\r | |
797 | )\r | |
798 | {\r | |
799 | UINTN MemoryMapSize;\r | |
800 | UINTN MapKey;\r | |
801 | UINTN DescriptorSize;\r | |
802 | UINT32 DescriptorVersion;\r | |
803 | EFI_MEMORY_DESCRIPTOR *MemoryMap;\r | |
804 | EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r | |
805 | EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r | |
806 | EFI_STATUS Status;\r | |
807 | UINT64 Attributes;\r | |
808 | LIST_ENTRY *Link;\r | |
809 | EFI_GCD_MAP_ENTRY *Entry;\r | |
810 | \r | |
811 | //\r | |
812 | // Get the EFI memory map.\r | |
813 | //\r | |
814 | MemoryMapSize = 0;\r | |
815 | MemoryMap = NULL;\r | |
816 | \r | |
817 | Status = gBS->GetMemoryMap (\r | |
818 | &MemoryMapSize,\r | |
819 | MemoryMap,\r | |
820 | &MapKey,\r | |
821 | &DescriptorSize,\r | |
822 | &DescriptorVersion\r | |
823 | );\r | |
824 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
825 | do {\r | |
826 | MemoryMap = (EFI_MEMORY_DESCRIPTOR *) AllocatePool (MemoryMapSize);\r | |
827 | ASSERT (MemoryMap != NULL);\r | |
828 | Status = gBS->GetMemoryMap (\r | |
829 | &MemoryMapSize,\r | |
830 | MemoryMap,\r | |
831 | &MapKey,\r | |
832 | &DescriptorSize,\r | |
833 | &DescriptorVersion\r | |
834 | );\r | |
835 | if (EFI_ERROR (Status)) {\r | |
836 | FreePool (MemoryMap);\r | |
837 | }\r | |
838 | } while (Status == EFI_BUFFER_TOO_SMALL);\r | |
839 | ASSERT_EFI_ERROR (Status);\r | |
840 | \r | |
841 | DEBUG((DEBUG_ERROR, "%a: applying strict permissions to active memory regions\n",\r | |
842 | __FUNCTION__));\r | |
843 | \r | |
844 | MergeMemoryMapForProtectionPolicy (MemoryMap, &MemoryMapSize, DescriptorSize);\r | |
845 | \r | |
846 | MemoryMapEntry = MemoryMap;\r | |
847 | MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);\r | |
848 | while ((UINTN) MemoryMapEntry < (UINTN) MemoryMapEnd) {\r | |
849 | \r | |
850 | Attributes = GetPermissionAttributeForMemoryType (MemoryMapEntry->Type);\r | |
851 | if (Attributes != 0) {\r | |
852 | SetUefiImageMemoryAttributes (\r | |
853 | MemoryMapEntry->PhysicalStart,\r | |
854 | LShiftU64 (MemoryMapEntry->NumberOfPages, EFI_PAGE_SHIFT),\r | |
855 | Attributes);\r | |
856 | }\r | |
857 | MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
858 | }\r | |
859 | FreePool (MemoryMap);\r | |
860 | \r | |
861 | //\r | |
862 | // Apply the policy for RAM regions that we know are present and\r | |
863 | // accessible, but have not been added to the UEFI memory map (yet).\r | |
864 | //\r | |
865 | if (GetPermissionAttributeForMemoryType (EfiConventionalMemory) != 0) {\r | |
866 | DEBUG((DEBUG_ERROR,\r | |
867 | "%a: applying strict permissions to inactive memory regions\n",\r | |
868 | __FUNCTION__));\r | |
869 | \r | |
870 | CoreAcquireGcdMemoryLock ();\r | |
871 | \r | |
872 | Link = mGcdMemorySpaceMap.ForwardLink;\r | |
873 | while (Link != &mGcdMemorySpaceMap) {\r | |
874 | \r | |
875 | Entry = CR (Link, EFI_GCD_MAP_ENTRY, Link, EFI_GCD_MAP_SIGNATURE);\r | |
876 | \r | |
877 | if (Entry->GcdMemoryType == EfiGcdMemoryTypeReserved &&\r | |
878 | Entry->EndAddress < MAX_ADDRESS &&\r | |
879 | (Entry->Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==\r | |
880 | (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED)) {\r | |
881 | \r | |
882 | Attributes = GetPermissionAttributeForMemoryType (EfiConventionalMemory) |\r | |
883 | (Entry->Attributes & CACHE_ATTRIBUTE_MASK);\r | |
884 | \r | |
885 | DEBUG ((DEBUG_INFO,\r | |
886 | "Untested GCD memory space region: - 0x%016lx - 0x%016lx (0x%016lx)\n",\r | |
887 | Entry->BaseAddress, Entry->EndAddress - Entry->BaseAddress + 1,\r | |
888 | Attributes));\r | |
889 | \r | |
890 | ASSERT(gCpu != NULL);\r | |
891 | gCpu->SetMemoryAttributes (gCpu, Entry->BaseAddress,\r | |
892 | Entry->EndAddress - Entry->BaseAddress + 1, Attributes);\r | |
893 | }\r | |
894 | \r | |
895 | Link = Link->ForwardLink;\r | |
896 | }\r | |
897 | CoreReleaseGcdMemoryLock ();\r | |
898 | }\r | |
899 | }\r | |
900 | \r | |
901 | \r | |
902 | /**\r | |
903 | A notification for CPU_ARCH protocol.\r | |
904 | \r | |
905 | @param[in] Event Event whose notification function is being invoked.\r | |
906 | @param[in] Context Pointer to the notification function's context,\r | |
907 | which is implementation-dependent.\r | |
908 | \r | |
909 | **/\r | |
910 | VOID\r | |
911 | EFIAPI\r | |
912 | MemoryProtectionCpuArchProtocolNotify (\r | |
913 | IN EFI_EVENT Event,\r | |
914 | IN VOID *Context\r | |
915 | )\r | |
916 | {\r | |
917 | EFI_STATUS Status;\r | |
918 | EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;\r | |
919 | EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath;\r | |
920 | UINTN NoHandles;\r | |
921 | EFI_HANDLE *HandleBuffer;\r | |
922 | UINTN Index;\r | |
923 | \r | |
924 | DEBUG ((DEBUG_INFO, "MemoryProtectionCpuArchProtocolNotify:\n"));\r | |
925 | Status = CoreLocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);\r | |
926 | if (EFI_ERROR (Status)) {\r | |
927 | return;\r | |
928 | }\r | |
929 | \r | |
930 | //\r | |
931 | // Apply the memory protection policy on non-BScode/RTcode regions.\r | |
932 | //\r | |
933 | if (PcdGet64 (PcdDxeNxMemoryProtectionPolicy) != 0) {\r | |
934 | InitializeDxeNxMemoryProtectionPolicy ();\r | |
935 | }\r | |
936 | \r | |
937 | if (mImageProtectionPolicy == 0) {\r | |
938 | return;\r | |
939 | }\r | |
940 | \r | |
941 | Status = gBS->LocateHandleBuffer (\r | |
942 | ByProtocol,\r | |
943 | &gEfiLoadedImageProtocolGuid,\r | |
944 | NULL,\r | |
945 | &NoHandles,\r | |
946 | &HandleBuffer\r | |
947 | );\r | |
948 | if (EFI_ERROR (Status) && (NoHandles == 0)) {\r | |
949 | return ;\r | |
950 | }\r | |
951 | \r | |
952 | for (Index = 0; Index < NoHandles; Index++) {\r | |
953 | Status = gBS->HandleProtocol (\r | |
954 | HandleBuffer[Index],\r | |
955 | &gEfiLoadedImageProtocolGuid,\r | |
956 | (VOID **)&LoadedImage\r | |
957 | );\r | |
958 | if (EFI_ERROR(Status)) {\r | |
959 | continue;\r | |
960 | }\r | |
961 | Status = gBS->HandleProtocol (\r | |
962 | HandleBuffer[Index],\r | |
963 | &gEfiLoadedImageDevicePathProtocolGuid,\r | |
964 | (VOID **)&LoadedImageDevicePath\r | |
965 | );\r | |
966 | if (EFI_ERROR(Status)) {\r | |
967 | LoadedImageDevicePath = NULL;\r | |
968 | }\r | |
969 | \r | |
970 | ProtectUefiImage (LoadedImage, LoadedImageDevicePath);\r | |
971 | }\r | |
972 | \r | |
973 | CoreCloseEvent (Event);\r | |
974 | return;\r | |
975 | }\r | |
976 | \r | |
977 | /**\r | |
978 | ExitBootServices Callback function for memory protection.\r | |
979 | **/\r | |
980 | VOID\r | |
981 | MemoryProtectionExitBootServicesCallback (\r | |
982 | VOID\r | |
983 | )\r | |
984 | {\r | |
985 | EFI_RUNTIME_IMAGE_ENTRY *RuntimeImage;\r | |
986 | LIST_ENTRY *Link;\r | |
987 | \r | |
988 | //\r | |
989 | // We need remove the RT protection, because RT relocation need write code segment\r | |
990 | // at SetVirtualAddressMap(). We cannot assume OS/Loader has taken over page table at that time.\r | |
991 | //\r | |
992 | // Firmware does not own page tables after ExitBootServices(), so the OS would\r | |
993 | // have to relax protection of RT code pages across SetVirtualAddressMap(), or\r | |
994 | // delay setting protections on RT code pages until after SetVirtualAddressMap().\r | |
995 | // OS may set protection on RT based upon EFI_MEMORY_ATTRIBUTES_TABLE later.\r | |
996 | //\r | |
997 | if (mImageProtectionPolicy != 0) {\r | |
998 | for (Link = gRuntime->ImageHead.ForwardLink; Link != &gRuntime->ImageHead; Link = Link->ForwardLink) {\r | |
999 | RuntimeImage = BASE_CR (Link, EFI_RUNTIME_IMAGE_ENTRY, Link);\r | |
1000 | SetUefiImageMemoryAttributes ((UINT64)(UINTN)RuntimeImage->ImageBase, ALIGN_VALUE(RuntimeImage->ImageSize, EFI_PAGE_SIZE), 0);\r | |
1001 | }\r | |
1002 | }\r | |
1003 | }\r | |
1004 | \r | |
1005 | /**\r | |
1006 | Initialize Memory Protection support.\r | |
1007 | **/\r | |
1008 | VOID\r | |
1009 | EFIAPI\r | |
1010 | CoreInitializeMemoryProtection (\r | |
1011 | VOID\r | |
1012 | )\r | |
1013 | {\r | |
1014 | EFI_STATUS Status;\r | |
1015 | EFI_EVENT Event;\r | |
1016 | VOID *Registration;\r | |
1017 | \r | |
1018 | mImageProtectionPolicy = PcdGet32(PcdImageProtectionPolicy);\r | |
1019 | \r | |
1020 | //\r | |
1021 | // Sanity check the PcdDxeNxMemoryProtectionPolicy setting:\r | |
1022 | // - code regions should have no EFI_MEMORY_XP attribute\r | |
1023 | // - EfiConventionalMemory and EfiBootServicesData should use the\r | |
1024 | // same attribute\r | |
1025 | //\r | |
1026 | ASSERT ((GetPermissionAttributeForMemoryType (EfiBootServicesCode) & EFI_MEMORY_XP) == 0);\r | |
1027 | ASSERT ((GetPermissionAttributeForMemoryType (EfiRuntimeServicesCode) & EFI_MEMORY_XP) == 0);\r | |
1028 | ASSERT ((GetPermissionAttributeForMemoryType (EfiLoaderCode) & EFI_MEMORY_XP) == 0);\r | |
1029 | ASSERT (GetPermissionAttributeForMemoryType (EfiBootServicesData) ==\r | |
1030 | GetPermissionAttributeForMemoryType (EfiConventionalMemory));\r | |
1031 | \r | |
1032 | if (mImageProtectionPolicy != 0 || PcdGet64 (PcdDxeNxMemoryProtectionPolicy) != 0) {\r | |
1033 | Status = CoreCreateEvent (\r | |
1034 | EVT_NOTIFY_SIGNAL,\r | |
1035 | TPL_CALLBACK,\r | |
1036 | MemoryProtectionCpuArchProtocolNotify,\r | |
1037 | NULL,\r | |
1038 | &Event\r | |
1039 | );\r | |
1040 | ASSERT_EFI_ERROR(Status);\r | |
1041 | \r | |
1042 | //\r | |
1043 | // Register for protocol notifactions on this event\r | |
1044 | //\r | |
1045 | Status = CoreRegisterProtocolNotify (\r | |
1046 | &gEfiCpuArchProtocolGuid,\r | |
1047 | Event,\r | |
1048 | &Registration\r | |
1049 | );\r | |
1050 | ASSERT_EFI_ERROR(Status);\r | |
1051 | }\r | |
1052 | return ;\r | |
1053 | }\r | |
1054 | \r | |
1055 | /**\r | |
1056 | Returns whether we are currently executing in SMM mode\r | |
1057 | **/\r | |
1058 | STATIC\r | |
1059 | BOOLEAN\r | |
1060 | IsInSmm (\r | |
1061 | VOID\r | |
1062 | )\r | |
1063 | {\r | |
1064 | BOOLEAN InSmm;\r | |
1065 | \r | |
1066 | InSmm = FALSE;\r | |
1067 | if (gSmmBase2 != NULL) {\r | |
1068 | gSmmBase2->InSmm (gSmmBase2, &InSmm);\r | |
1069 | }\r | |
1070 | return InSmm;\r | |
1071 | }\r | |
1072 | \r | |
1073 | /**\r | |
1074 | Manage memory permission attributes on a memory range, according to the\r | |
1075 | configured DXE memory protection policy.\r | |
1076 | \r | |
1077 | @param OldType The old memory type of the range\r | |
1078 | @param NewType The new memory type of the range\r | |
1079 | @param Memory The base address of the range\r | |
1080 | @param Length The size of the range (in bytes)\r | |
1081 | \r | |
1082 | @return EFI_SUCCESS If we are executing in SMM mode. No permission attributes\r | |
1083 | are updated in this case\r | |
1084 | @return EFI_SUCCESS If the the CPU arch protocol is not installed yet\r | |
1085 | @return EFI_SUCCESS If no DXE memory protection policy has been configured\r | |
1086 | @return EFI_SUCCESS If OldType and NewType use the same permission attributes\r | |
1087 | @return other Return value of gCpu->SetMemoryAttributes()\r | |
1088 | \r | |
1089 | **/\r | |
1090 | EFI_STATUS\r | |
1091 | EFIAPI\r | |
1092 | ApplyMemoryProtectionPolicy (\r | |
1093 | IN EFI_MEMORY_TYPE OldType,\r | |
1094 | IN EFI_MEMORY_TYPE NewType,\r | |
1095 | IN EFI_PHYSICAL_ADDRESS Memory,\r | |
1096 | IN UINT64 Length\r | |
1097 | )\r | |
1098 | {\r | |
1099 | UINT64 OldAttributes;\r | |
1100 | UINT64 NewAttributes;\r | |
1101 | \r | |
1102 | //\r | |
1103 | // The policy configured in PcdDxeNxMemoryProtectionPolicy\r | |
1104 | // does not apply to allocations performed in SMM mode.\r | |
1105 | //\r | |
1106 | if (IsInSmm ()) {\r | |
1107 | return EFI_SUCCESS;\r | |
1108 | }\r | |
1109 | \r | |
1110 | //\r | |
1111 | // If the CPU arch protocol is not installed yet, we cannot manage memory\r | |
1112 | // permission attributes, and it is the job of the driver that installs this\r | |
1113 | // protocol to set the permissions on existing allocations.\r | |
1114 | //\r | |
1115 | if (gCpu == NULL) {\r | |
1116 | return EFI_SUCCESS;\r | |
1117 | }\r | |
1118 | \r | |
1119 | //\r | |
1120 | // Check if a DXE memory protection policy has been configured\r | |
1121 | //\r | |
1122 | if (PcdGet64 (PcdDxeNxMemoryProtectionPolicy) == 0) {\r | |
1123 | return EFI_SUCCESS;\r | |
1124 | }\r | |
1125 | \r | |
1126 | //\r | |
1127 | // Update the executable permissions according to the DXE memory\r | |
1128 | // protection policy, but only if\r | |
1129 | // - the policy is different between the old and the new type, or\r | |
1130 | // - this is a newly added region (OldType == EfiMaxMemoryType)\r | |
1131 | //\r | |
1132 | NewAttributes = GetPermissionAttributeForMemoryType (NewType);\r | |
1133 | \r | |
1134 | if (OldType != EfiMaxMemoryType) {\r | |
1135 | OldAttributes = GetPermissionAttributeForMemoryType (OldType);\r | |
1136 | if (OldAttributes == NewAttributes) {\r | |
1137 | // policy is the same between OldType and NewType\r | |
1138 | return EFI_SUCCESS;\r | |
1139 | }\r | |
1140 | } else if (NewAttributes == 0) {\r | |
1141 | // newly added region of a type that does not require protection\r | |
1142 | return EFI_SUCCESS;\r | |
1143 | }\r | |
1144 | \r | |
1145 | return gCpu->SetMemoryAttributes (gCpu, Memory, Length, NewAttributes);\r | |
1146 | }\r |