Commit | Line | Data |
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d0e92aad JY |
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 | UINT32 mImageProtectionPolicy;\r | |
68 | \r | |
69 | /**\r | |
70 | Sort code section in image record, based upon CodeSegmentBase from low to high.\r | |
71 | \r | |
72 | @param ImageRecord image record to be sorted\r | |
73 | **/\r | |
74 | VOID\r | |
75 | SortImageRecordCodeSection (\r | |
76 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
77 | );\r | |
78 | \r | |
79 | /**\r | |
80 | Check if code section in image record is valid.\r | |
81 | \r | |
82 | @param ImageRecord image record to be checked\r | |
83 | \r | |
84 | @retval TRUE image record is valid\r | |
85 | @retval FALSE image record is invalid\r | |
86 | **/\r | |
87 | BOOLEAN\r | |
88 | IsImageRecordCodeSectionValid (\r | |
89 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
90 | );\r | |
91 | \r | |
92 | /**\r | |
93 | Get the image type.\r | |
94 | \r | |
95 | @param[in] File This is a pointer to the device path of the file that is\r | |
96 | being dispatched.\r | |
97 | \r | |
98 | @return UINT32 Image Type\r | |
99 | **/\r | |
100 | UINT32\r | |
101 | GetImageType (\r | |
102 | IN CONST EFI_DEVICE_PATH_PROTOCOL *File\r | |
103 | )\r | |
104 | {\r | |
105 | EFI_STATUS Status;\r | |
106 | EFI_HANDLE DeviceHandle;\r | |
107 | EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;\r | |
108 | \r | |
109 | if (File == NULL) {\r | |
110 | return IMAGE_UNKNOWN;\r | |
111 | }\r | |
112 | \r | |
113 | //\r | |
114 | // First check to see if File is from a Firmware Volume\r | |
115 | //\r | |
116 | DeviceHandle = NULL;\r | |
117 | TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *) File;\r | |
118 | Status = gBS->LocateDevicePath (\r | |
119 | &gEfiFirmwareVolume2ProtocolGuid,\r | |
120 | &TempDevicePath,\r | |
121 | &DeviceHandle\r | |
122 | );\r | |
123 | if (!EFI_ERROR (Status)) {\r | |
124 | Status = gBS->OpenProtocol (\r | |
125 | DeviceHandle,\r | |
126 | &gEfiFirmwareVolume2ProtocolGuid,\r | |
127 | NULL,\r | |
128 | NULL,\r | |
129 | NULL,\r | |
130 | EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r | |
131 | );\r | |
132 | if (!EFI_ERROR (Status)) {\r | |
133 | return IMAGE_FROM_FV;\r | |
134 | }\r | |
135 | }\r | |
136 | return IMAGE_UNKNOWN;\r | |
137 | }\r | |
138 | \r | |
139 | /**\r | |
140 | Get UEFI image protection policy based upon image type.\r | |
141 | \r | |
142 | @param[in] ImageType The UEFI image type\r | |
143 | \r | |
144 | @return UEFI image protection policy\r | |
145 | **/\r | |
146 | UINT32\r | |
147 | GetProtectionPolicyFromImageType (\r | |
148 | IN UINT32 ImageType\r | |
149 | )\r | |
150 | {\r | |
151 | if ((ImageType & mImageProtectionPolicy) == 0) {\r | |
152 | return DO_NOT_PROTECT;\r | |
153 | } else {\r | |
154 | return PROTECT_IF_ALIGNED_ELSE_ALLOW;\r | |
155 | }\r | |
156 | }\r | |
157 | \r | |
158 | /**\r | |
159 | Get UEFI image protection policy based upon loaded image device path.\r | |
160 | \r | |
161 | @param[in] LoadedImage The loaded image protocol\r | |
162 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
163 | \r | |
164 | @return UEFI image protection policy\r | |
165 | **/\r | |
166 | UINT32\r | |
167 | GetUefiImageProtectionPolicy (\r | |
168 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
169 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
170 | )\r | |
171 | {\r | |
172 | BOOLEAN InSmm;\r | |
173 | UINT32 ImageType;\r | |
174 | UINT32 ProtectionPolicy;\r | |
175 | \r | |
176 | //\r | |
177 | // Check SMM\r | |
178 | //\r | |
179 | InSmm = FALSE;\r | |
180 | if (gSmmBase2 != NULL) {\r | |
181 | gSmmBase2->InSmm (gSmmBase2, &InSmm);\r | |
182 | }\r | |
183 | if (InSmm) {\r | |
184 | return FALSE;\r | |
185 | }\r | |
186 | \r | |
187 | //\r | |
188 | // Check DevicePath\r | |
189 | //\r | |
190 | if (LoadedImage == gDxeCoreLoadedImage) {\r | |
191 | ImageType = IMAGE_FROM_FV;\r | |
192 | } else {\r | |
193 | ImageType = GetImageType (LoadedImageDevicePath);\r | |
194 | }\r | |
195 | ProtectionPolicy = GetProtectionPolicyFromImageType (ImageType);\r | |
196 | return ProtectionPolicy;\r | |
197 | }\r | |
198 | \r | |
199 | \r | |
200 | /**\r | |
201 | Set UEFI image memory attributes.\r | |
202 | \r | |
203 | @param[in] BaseAddress Specified start address\r | |
204 | @param[in] Length Specified length\r | |
205 | @param[in] Attributes Specified attributes\r | |
206 | **/\r | |
207 | VOID\r | |
208 | SetUefiImageMemoryAttributes (\r | |
209 | IN UINT64 BaseAddress,\r | |
210 | IN UINT64 Length,\r | |
211 | IN UINT64 Attributes\r | |
212 | )\r | |
213 | {\r | |
214 | EFI_STATUS Status;\r | |
215 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor;\r | |
216 | UINT64 FinalAttributes;\r | |
217 | \r | |
218 | Status = CoreGetMemorySpaceDescriptor(BaseAddress, &Descriptor);\r | |
219 | ASSERT_EFI_ERROR(Status);\r | |
220 | \r | |
221 | FinalAttributes = (Descriptor.Attributes & CACHE_ATTRIBUTE_MASK) | (Attributes & MEMORY_ATTRIBUTE_MASK);\r | |
222 | \r | |
223 | DEBUG ((DEBUG_INFO, "SetUefiImageMemoryAttributes - 0x%016lx - 0x%016lx (0x%016lx)\n", BaseAddress, Length, FinalAttributes));\r | |
224 | \r | |
225 | ASSERT(gCpu != NULL);\r | |
226 | gCpu->SetMemoryAttributes (gCpu, BaseAddress, Length, FinalAttributes);\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | Set UEFI image protection attributes.\r | |
231 | \r | |
232 | @param[in] ImageRecord A UEFI image record\r | |
233 | @param[in] Protect TRUE: Protect the UEFI image.\r | |
234 | FALSE: Unprotect the UEFI image.\r | |
235 | **/\r | |
236 | VOID\r | |
237 | SetUefiImageProtectionAttributes (\r | |
238 | IN IMAGE_PROPERTIES_RECORD *ImageRecord,\r | |
239 | IN BOOLEAN Protect\r | |
240 | )\r | |
241 | {\r | |
242 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
243 | LIST_ENTRY *ImageRecordCodeSectionLink;\r | |
244 | LIST_ENTRY *ImageRecordCodeSectionEndLink;\r | |
245 | LIST_ENTRY *ImageRecordCodeSectionList;\r | |
246 | UINT64 CurrentBase;\r | |
247 | UINT64 ImageEnd;\r | |
248 | UINT64 Attribute;\r | |
249 | \r | |
250 | ImageRecordCodeSectionList = &ImageRecord->CodeSegmentList;\r | |
251 | \r | |
252 | CurrentBase = ImageRecord->ImageBase;\r | |
253 | ImageEnd = ImageRecord->ImageBase + ImageRecord->ImageSize;\r | |
254 | \r | |
255 | ImageRecordCodeSectionLink = ImageRecordCodeSectionList->ForwardLink;\r | |
256 | ImageRecordCodeSectionEndLink = ImageRecordCodeSectionList;\r | |
257 | while (ImageRecordCodeSectionLink != ImageRecordCodeSectionEndLink) {\r | |
258 | ImageRecordCodeSection = CR (\r | |
259 | ImageRecordCodeSectionLink,\r | |
260 | IMAGE_PROPERTIES_RECORD_CODE_SECTION,\r | |
261 | Link,\r | |
262 | IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE\r | |
263 | );\r | |
264 | ImageRecordCodeSectionLink = ImageRecordCodeSectionLink->ForwardLink;\r | |
265 | \r | |
266 | ASSERT (CurrentBase <= ImageRecordCodeSection->CodeSegmentBase);\r | |
267 | if (CurrentBase < ImageRecordCodeSection->CodeSegmentBase) {\r | |
268 | //\r | |
269 | // DATA\r | |
270 | //\r | |
271 | if (Protect) {\r | |
272 | Attribute = EFI_MEMORY_XP;\r | |
273 | } else {\r | |
274 | Attribute = 0;\r | |
275 | }\r | |
276 | SetUefiImageMemoryAttributes (\r | |
277 | CurrentBase,\r | |
278 | ImageRecordCodeSection->CodeSegmentBase - CurrentBase,\r | |
279 | Attribute\r | |
280 | );\r | |
281 | }\r | |
282 | //\r | |
283 | // CODE\r | |
284 | //\r | |
285 | if (Protect) {\r | |
286 | Attribute = EFI_MEMORY_RO;\r | |
287 | } else {\r | |
288 | Attribute = 0;\r | |
289 | }\r | |
290 | SetUefiImageMemoryAttributes (\r | |
291 | ImageRecordCodeSection->CodeSegmentBase,\r | |
292 | ImageRecordCodeSection->CodeSegmentSize,\r | |
293 | Attribute\r | |
294 | );\r | |
295 | CurrentBase = ImageRecordCodeSection->CodeSegmentBase + ImageRecordCodeSection->CodeSegmentSize;\r | |
296 | }\r | |
297 | //\r | |
298 | // Last DATA\r | |
299 | //\r | |
300 | ASSERT (CurrentBase <= ImageEnd);\r | |
301 | if (CurrentBase < ImageEnd) {\r | |
302 | //\r | |
303 | // DATA\r | |
304 | //\r | |
305 | if (Protect) {\r | |
306 | Attribute = EFI_MEMORY_XP;\r | |
307 | } else {\r | |
308 | Attribute = 0;\r | |
309 | }\r | |
310 | SetUefiImageMemoryAttributes (\r | |
311 | CurrentBase,\r | |
312 | ImageEnd - CurrentBase,\r | |
313 | Attribute\r | |
314 | );\r | |
315 | }\r | |
316 | return ;\r | |
317 | }\r | |
318 | \r | |
319 | /**\r | |
320 | Return if the PE image section is aligned.\r | |
321 | \r | |
322 | @param[in] SectionAlignment PE/COFF section alignment\r | |
323 | @param[in] MemoryType PE/COFF image memory type\r | |
324 | \r | |
325 | @retval TRUE The PE image section is aligned.\r | |
326 | @retval FALSE The PE image section is not aligned.\r | |
327 | **/\r | |
328 | BOOLEAN\r | |
329 | IsMemoryProtectionSectionAligned (\r | |
330 | IN UINT32 SectionAlignment,\r | |
331 | IN EFI_MEMORY_TYPE MemoryType\r | |
332 | )\r | |
333 | {\r | |
334 | UINT32 PageAlignment;\r | |
335 | \r | |
336 | switch (MemoryType) {\r | |
337 | case EfiRuntimeServicesCode:\r | |
338 | case EfiACPIMemoryNVS:\r | |
339 | PageAlignment = EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT;\r | |
340 | break;\r | |
341 | case EfiRuntimeServicesData:\r | |
342 | case EfiACPIReclaimMemory:\r | |
343 | ASSERT (FALSE);\r | |
344 | PageAlignment = EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT;\r | |
345 | break;\r | |
346 | case EfiBootServicesCode:\r | |
347 | case EfiLoaderCode:\r | |
348 | case EfiReservedMemoryType:\r | |
349 | PageAlignment = EFI_PAGE_SIZE;\r | |
350 | break;\r | |
351 | default:\r | |
352 | ASSERT (FALSE);\r | |
353 | PageAlignment = EFI_PAGE_SIZE;\r | |
354 | break;\r | |
355 | }\r | |
356 | \r | |
357 | if ((SectionAlignment & (PageAlignment - 1)) != 0) {\r | |
358 | return FALSE;\r | |
359 | } else {\r | |
360 | return TRUE;\r | |
361 | }\r | |
362 | }\r | |
363 | \r | |
364 | /**\r | |
365 | Free Image record.\r | |
366 | \r | |
367 | @param[in] ImageRecord A UEFI image record\r | |
368 | **/\r | |
369 | VOID\r | |
370 | FreeImageRecord (\r | |
371 | IN IMAGE_PROPERTIES_RECORD *ImageRecord\r | |
372 | )\r | |
373 | {\r | |
374 | LIST_ENTRY *CodeSegmentListHead;\r | |
375 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
376 | \r | |
377 | CodeSegmentListHead = &ImageRecord->CodeSegmentList;\r | |
378 | while (!IsListEmpty (CodeSegmentListHead)) {\r | |
379 | ImageRecordCodeSection = CR (\r | |
380 | CodeSegmentListHead->ForwardLink,\r | |
381 | IMAGE_PROPERTIES_RECORD_CODE_SECTION,\r | |
382 | Link,\r | |
383 | IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE\r | |
384 | );\r | |
385 | RemoveEntryList (&ImageRecordCodeSection->Link);\r | |
386 | FreePool (ImageRecordCodeSection);\r | |
387 | }\r | |
388 | \r | |
389 | if (ImageRecord->Link.ForwardLink != NULL) {\r | |
390 | RemoveEntryList (&ImageRecord->Link);\r | |
391 | }\r | |
392 | FreePool (ImageRecord);\r | |
393 | }\r | |
394 | \r | |
395 | /**\r | |
396 | Protect or unprotect UEFI image common function.\r | |
397 | \r | |
398 | @param[in] LoadedImage The loaded image protocol\r | |
399 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
400 | @param[in] Protect TRUE: Protect the UEFI image.\r | |
401 | FALSE: Unprotect the UEFI image.\r | |
402 | **/\r | |
403 | VOID\r | |
404 | ProtectUefiImageCommon (\r | |
405 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
406 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath,\r | |
407 | IN BOOLEAN Protect\r | |
408 | )\r | |
409 | {\r | |
410 | VOID *ImageAddress;\r | |
411 | EFI_IMAGE_DOS_HEADER *DosHdr;\r | |
412 | UINT32 PeCoffHeaderOffset;\r | |
413 | UINT32 SectionAlignment;\r | |
414 | EFI_IMAGE_SECTION_HEADER *Section;\r | |
415 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r | |
416 | UINT8 *Name;\r | |
417 | UINTN Index;\r | |
418 | IMAGE_PROPERTIES_RECORD *ImageRecord;\r | |
419 | CHAR8 *PdbPointer;\r | |
420 | IMAGE_PROPERTIES_RECORD_CODE_SECTION *ImageRecordCodeSection;\r | |
421 | UINT16 Magic;\r | |
422 | BOOLEAN IsAligned;\r | |
423 | UINT32 ProtectionPolicy;\r | |
424 | \r | |
425 | DEBUG ((DEBUG_INFO, "ProtectUefiImageCommon - 0x%x\n", LoadedImage));\r | |
426 | DEBUG ((DEBUG_INFO, " - 0x%016lx - 0x%016lx\n", (EFI_PHYSICAL_ADDRESS)(UINTN)LoadedImage->ImageBase, LoadedImage->ImageSize));\r | |
427 | \r | |
428 | if (gCpu == NULL) {\r | |
429 | return ;\r | |
430 | }\r | |
431 | \r | |
432 | ProtectionPolicy = GetUefiImageProtectionPolicy (LoadedImage, LoadedImageDevicePath);\r | |
433 | switch (ProtectionPolicy) {\r | |
434 | case DO_NOT_PROTECT:\r | |
435 | return ;\r | |
436 | case PROTECT_IF_ALIGNED_ELSE_ALLOW:\r | |
437 | break;\r | |
438 | default:\r | |
439 | ASSERT(FALSE);\r | |
440 | return ;\r | |
441 | }\r | |
442 | \r | |
443 | ImageRecord = AllocateZeroPool (sizeof(*ImageRecord));\r | |
444 | if (ImageRecord == NULL) {\r | |
445 | return ;\r | |
446 | }\r | |
447 | ImageRecord->Signature = IMAGE_PROPERTIES_RECORD_SIGNATURE;\r | |
448 | \r | |
449 | //\r | |
450 | // Step 1: record whole region\r | |
451 | //\r | |
452 | ImageRecord->ImageBase = (EFI_PHYSICAL_ADDRESS)(UINTN)LoadedImage->ImageBase;\r | |
453 | ImageRecord->ImageSize = LoadedImage->ImageSize;\r | |
454 | \r | |
455 | ImageAddress = LoadedImage->ImageBase;\r | |
456 | \r | |
457 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
458 | if (PdbPointer != NULL) {\r | |
459 | DEBUG ((DEBUG_VERBOSE, " Image - %a\n", PdbPointer));\r | |
460 | }\r | |
461 | \r | |
462 | //\r | |
463 | // Check PE/COFF image\r | |
464 | //\r | |
465 | DosHdr = (EFI_IMAGE_DOS_HEADER *) (UINTN) ImageAddress;\r | |
466 | PeCoffHeaderOffset = 0;\r | |
467 | if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {\r | |
468 | PeCoffHeaderOffset = DosHdr->e_lfanew;\r | |
469 | }\r | |
470 | \r | |
471 | Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINT8 *) (UINTN) ImageAddress + PeCoffHeaderOffset);\r | |
472 | if (Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {\r | |
473 | DEBUG ((DEBUG_VERBOSE, "Hdr.Pe32->Signature invalid - 0x%x\n", Hdr.Pe32->Signature));\r | |
474 | // It might be image in SMM.\r | |
475 | goto Finish;\r | |
476 | }\r | |
477 | \r | |
478 | //\r | |
479 | // Get SectionAlignment\r | |
480 | //\r | |
481 | if (Hdr.Pe32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64 && Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r | |
482 | //\r | |
483 | // NOTE: Some versions of Linux ELILO for Itanium have an incorrect magic value\r | |
484 | // in the PE/COFF Header. If the MachineType is Itanium(IA64) and the\r | |
485 | // Magic value in the OptionalHeader is EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC\r | |
486 | // then override the magic value to EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC\r | |
487 | //\r | |
488 | Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;\r | |
489 | } else {\r | |
490 | //\r | |
491 | // Get the magic value from the PE/COFF Optional Header\r | |
492 | //\r | |
493 | Magic = Hdr.Pe32->OptionalHeader.Magic;\r | |
494 | }\r | |
495 | if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {\r | |
496 | SectionAlignment = Hdr.Pe32->OptionalHeader.SectionAlignment;\r | |
497 | } else {\r | |
498 | SectionAlignment = Hdr.Pe32Plus->OptionalHeader.SectionAlignment;\r | |
499 | }\r | |
500 | \r | |
501 | IsAligned = IsMemoryProtectionSectionAligned (SectionAlignment, LoadedImage->ImageCodeType);\r | |
502 | if (!IsAligned) {\r | |
503 | DEBUG ((DEBUG_VERBOSE, "!!!!!!!! ProtectUefiImageCommon - Section Alignment(0x%x) is incorrect !!!!!!!!\n",\r | |
504 | SectionAlignment));\r | |
505 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
506 | if (PdbPointer != NULL) {\r | |
507 | DEBUG ((DEBUG_VERBOSE, "!!!!!!!! Image - %a !!!!!!!!\n", PdbPointer));\r | |
508 | }\r | |
509 | goto Finish;\r | |
510 | }\r | |
511 | \r | |
512 | Section = (EFI_IMAGE_SECTION_HEADER *) (\r | |
513 | (UINT8 *) (UINTN) ImageAddress +\r | |
514 | PeCoffHeaderOffset +\r | |
515 | sizeof(UINT32) +\r | |
516 | sizeof(EFI_IMAGE_FILE_HEADER) +\r | |
517 | Hdr.Pe32->FileHeader.SizeOfOptionalHeader\r | |
518 | );\r | |
519 | ImageRecord->CodeSegmentCount = 0;\r | |
520 | InitializeListHead (&ImageRecord->CodeSegmentList);\r | |
521 | for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {\r | |
522 | Name = Section[Index].Name;\r | |
523 | DEBUG ((\r | |
524 | DEBUG_VERBOSE,\r | |
525 | " Section - '%c%c%c%c%c%c%c%c'\n",\r | |
526 | Name[0],\r | |
527 | Name[1],\r | |
528 | Name[2],\r | |
529 | Name[3],\r | |
530 | Name[4],\r | |
531 | Name[5],\r | |
532 | Name[6],\r | |
533 | Name[7]\r | |
534 | ));\r | |
535 | \r | |
a2ed40c0 AB |
536 | //\r |
537 | // Instead of assuming that a PE/COFF section of type EFI_IMAGE_SCN_CNT_CODE\r | |
538 | // can always be mapped read-only, classify a section as a code section only\r | |
539 | // if it has the executable attribute set and the writable attribute cleared.\r | |
540 | //\r | |
541 | // This adheres more closely to the PE/COFF spec, and avoids issues with\r | |
542 | // Linux OS loaders that may consist of a single read/write/execute section.\r | |
543 | //\r | |
544 | if ((Section[Index].Characteristics & (EFI_IMAGE_SCN_MEM_WRITE | EFI_IMAGE_SCN_MEM_EXECUTE)) == EFI_IMAGE_SCN_MEM_EXECUTE) {\r | |
d0e92aad JY |
545 | DEBUG ((DEBUG_VERBOSE, " VirtualSize - 0x%08x\n", Section[Index].Misc.VirtualSize));\r |
546 | DEBUG ((DEBUG_VERBOSE, " VirtualAddress - 0x%08x\n", Section[Index].VirtualAddress));\r | |
547 | DEBUG ((DEBUG_VERBOSE, " SizeOfRawData - 0x%08x\n", Section[Index].SizeOfRawData));\r | |
548 | DEBUG ((DEBUG_VERBOSE, " PointerToRawData - 0x%08x\n", Section[Index].PointerToRawData));\r | |
549 | DEBUG ((DEBUG_VERBOSE, " PointerToRelocations - 0x%08x\n", Section[Index].PointerToRelocations));\r | |
550 | DEBUG ((DEBUG_VERBOSE, " PointerToLinenumbers - 0x%08x\n", Section[Index].PointerToLinenumbers));\r | |
551 | DEBUG ((DEBUG_VERBOSE, " NumberOfRelocations - 0x%08x\n", Section[Index].NumberOfRelocations));\r | |
552 | DEBUG ((DEBUG_VERBOSE, " NumberOfLinenumbers - 0x%08x\n", Section[Index].NumberOfLinenumbers));\r | |
553 | DEBUG ((DEBUG_VERBOSE, " Characteristics - 0x%08x\n", Section[Index].Characteristics));\r | |
554 | \r | |
555 | //\r | |
556 | // Step 2: record code section\r | |
557 | //\r | |
558 | ImageRecordCodeSection = AllocatePool (sizeof(*ImageRecordCodeSection));\r | |
559 | if (ImageRecordCodeSection == NULL) {\r | |
560 | return ;\r | |
561 | }\r | |
562 | ImageRecordCodeSection->Signature = IMAGE_PROPERTIES_RECORD_CODE_SECTION_SIGNATURE;\r | |
563 | \r | |
564 | ImageRecordCodeSection->CodeSegmentBase = (UINTN)ImageAddress + Section[Index].VirtualAddress;\r | |
565 | ImageRecordCodeSection->CodeSegmentSize = ALIGN_VALUE(Section[Index].SizeOfRawData, SectionAlignment);\r | |
566 | \r | |
567 | DEBUG ((DEBUG_VERBOSE, "ImageCode: 0x%016lx - 0x%016lx\n", ImageRecordCodeSection->CodeSegmentBase, ImageRecordCodeSection->CodeSegmentSize));\r | |
568 | \r | |
569 | InsertTailList (&ImageRecord->CodeSegmentList, &ImageRecordCodeSection->Link);\r | |
570 | ImageRecord->CodeSegmentCount++;\r | |
571 | }\r | |
572 | }\r | |
573 | \r | |
574 | if (ImageRecord->CodeSegmentCount == 0) {\r | |
575 | DEBUG ((DEBUG_ERROR, "!!!!!!!! ProtectUefiImageCommon - CodeSegmentCount is 0 !!!!!!!!\n"));\r | |
576 | PdbPointer = PeCoffLoaderGetPdbPointer ((VOID*) (UINTN) ImageAddress);\r | |
577 | if (PdbPointer != NULL) {\r | |
578 | DEBUG ((DEBUG_ERROR, "!!!!!!!! Image - %a !!!!!!!!\n", PdbPointer));\r | |
579 | }\r | |
580 | goto Finish;\r | |
581 | }\r | |
582 | \r | |
583 | //\r | |
584 | // Final\r | |
585 | //\r | |
586 | SortImageRecordCodeSection (ImageRecord);\r | |
587 | //\r | |
588 | // Check overlap all section in ImageBase/Size\r | |
589 | //\r | |
590 | if (!IsImageRecordCodeSectionValid (ImageRecord)) {\r | |
591 | DEBUG ((DEBUG_ERROR, "IsImageRecordCodeSectionValid - FAIL\n"));\r | |
592 | goto Finish;\r | |
593 | }\r | |
594 | \r | |
595 | //\r | |
596 | // Round up the ImageSize, some CPU arch may return EFI_UNSUPPORTED if ImageSize is not aligned.\r | |
597 | // Given that the loader always allocates full pages, we know the space after the image is not used.\r | |
598 | //\r | |
599 | ImageRecord->ImageSize = ALIGN_VALUE(LoadedImage->ImageSize, EFI_PAGE_SIZE);\r | |
600 | \r | |
601 | //\r | |
602 | // CPU ARCH present. Update memory attribute directly.\r | |
603 | //\r | |
604 | SetUefiImageProtectionAttributes (ImageRecord, Protect);\r | |
605 | \r | |
606 | //\r | |
607 | // Clean up\r | |
608 | //\r | |
609 | FreeImageRecord (ImageRecord);\r | |
610 | \r | |
611 | Finish:\r | |
612 | return ;\r | |
613 | }\r | |
614 | \r | |
615 | /**\r | |
616 | Protect UEFI image.\r | |
617 | \r | |
618 | @param[in] LoadedImage The loaded image protocol\r | |
619 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
620 | **/\r | |
621 | VOID\r | |
622 | ProtectUefiImage (\r | |
623 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
624 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
625 | )\r | |
626 | {\r | |
627 | if (PcdGet32(PcdImageProtectionPolicy) != 0) {\r | |
628 | ProtectUefiImageCommon (LoadedImage, LoadedImageDevicePath, TRUE);\r | |
629 | }\r | |
630 | }\r | |
631 | \r | |
632 | /**\r | |
633 | Unprotect UEFI image.\r | |
634 | \r | |
635 | @param[in] LoadedImage The loaded image protocol\r | |
636 | @param[in] LoadedImageDevicePath The loaded image device path protocol\r | |
637 | **/\r | |
638 | VOID\r | |
639 | UnprotectUefiImage (\r | |
640 | IN EFI_LOADED_IMAGE_PROTOCOL *LoadedImage,\r | |
641 | IN EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath\r | |
642 | )\r | |
643 | {\r | |
644 | if (PcdGet32(PcdImageProtectionPolicy) != 0) {\r | |
645 | ProtectUefiImageCommon (LoadedImage, LoadedImageDevicePath, FALSE);\r | |
646 | }\r | |
647 | }\r | |
648 | \r | |
649 | /**\r | |
650 | A notification for CPU_ARCH protocol.\r | |
651 | \r | |
652 | @param[in] Event Event whose notification function is being invoked.\r | |
653 | @param[in] Context Pointer to the notification function's context,\r | |
654 | which is implementation-dependent.\r | |
655 | \r | |
656 | **/\r | |
657 | VOID\r | |
658 | EFIAPI\r | |
659 | MemoryProtectionCpuArchProtocolNotify (\r | |
660 | IN EFI_EVENT Event,\r | |
661 | IN VOID *Context\r | |
662 | )\r | |
663 | {\r | |
664 | EFI_STATUS Status;\r | |
665 | EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;\r | |
666 | EFI_DEVICE_PATH_PROTOCOL *LoadedImageDevicePath;\r | |
667 | UINTN NoHandles;\r | |
668 | EFI_HANDLE *HandleBuffer;\r | |
669 | UINTN Index;\r | |
670 | \r | |
671 | DEBUG ((DEBUG_INFO, "MemoryProtectionCpuArchProtocolNotify:\n"));\r | |
672 | Status = CoreLocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);\r | |
673 | if (EFI_ERROR (Status)) {\r | |
674 | return;\r | |
675 | }\r | |
676 | \r | |
677 | Status = gBS->LocateHandleBuffer (\r | |
678 | ByProtocol,\r | |
679 | &gEfiLoadedImageProtocolGuid,\r | |
680 | NULL,\r | |
681 | &NoHandles,\r | |
682 | &HandleBuffer\r | |
683 | );\r | |
684 | if (EFI_ERROR (Status) && (NoHandles == 0)) {\r | |
685 | return ;\r | |
686 | }\r | |
687 | \r | |
688 | for (Index = 0; Index < NoHandles; Index++) {\r | |
689 | Status = gBS->HandleProtocol (\r | |
690 | HandleBuffer[Index],\r | |
691 | &gEfiLoadedImageProtocolGuid,\r | |
692 | (VOID **)&LoadedImage\r | |
693 | );\r | |
694 | if (EFI_ERROR(Status)) {\r | |
695 | continue;\r | |
696 | }\r | |
697 | Status = gBS->HandleProtocol (\r | |
698 | HandleBuffer[Index],\r | |
699 | &gEfiLoadedImageDevicePathProtocolGuid,\r | |
700 | (VOID **)&LoadedImageDevicePath\r | |
701 | );\r | |
702 | if (EFI_ERROR(Status)) {\r | |
703 | LoadedImageDevicePath = NULL;\r | |
704 | }\r | |
705 | \r | |
706 | ProtectUefiImage (LoadedImage, LoadedImageDevicePath);\r | |
707 | }\r | |
708 | \r | |
709 | CoreCloseEvent (Event);\r | |
710 | return;\r | |
711 | }\r | |
712 | \r | |
713 | /**\r | |
714 | ExitBootServices Callback function for memory protection.\r | |
715 | **/\r | |
716 | VOID\r | |
717 | MemoryProtectionExitBootServicesCallback (\r | |
718 | VOID\r | |
719 | )\r | |
720 | {\r | |
721 | EFI_RUNTIME_IMAGE_ENTRY *RuntimeImage;\r | |
722 | LIST_ENTRY *Link;\r | |
723 | \r | |
724 | //\r | |
725 | // We need remove the RT protection, because RT relocation need write code segment\r | |
726 | // at SetVirtualAddressMap(). We cannot assume OS/Loader has taken over page table at that time.\r | |
727 | //\r | |
728 | // Firmware does not own page tables after ExitBootServices(), so the OS would\r | |
729 | // have to relax protection of RT code pages across SetVirtualAddressMap(), or\r | |
730 | // delay setting protections on RT code pages until after SetVirtualAddressMap().\r | |
731 | // OS may set protection on RT based upon EFI_MEMORY_ATTRIBUTES_TABLE later.\r | |
732 | //\r | |
733 | if (mImageProtectionPolicy != 0) {\r | |
734 | for (Link = gRuntime->ImageHead.ForwardLink; Link != &gRuntime->ImageHead; Link = Link->ForwardLink) {\r | |
735 | RuntimeImage = BASE_CR (Link, EFI_RUNTIME_IMAGE_ENTRY, Link);\r | |
736 | SetUefiImageMemoryAttributes ((UINT64)(UINTN)RuntimeImage->ImageBase, ALIGN_VALUE(RuntimeImage->ImageSize, EFI_PAGE_SIZE), 0);\r | |
737 | }\r | |
738 | }\r | |
739 | }\r | |
740 | \r | |
741 | /**\r | |
742 | Initialize Memory Protection support.\r | |
743 | **/\r | |
744 | VOID\r | |
745 | EFIAPI\r | |
746 | CoreInitializeMemoryProtection (\r | |
747 | VOID\r | |
748 | )\r | |
749 | {\r | |
750 | EFI_STATUS Status;\r | |
751 | EFI_EVENT Event;\r | |
752 | VOID *Registration;\r | |
753 | \r | |
754 | mImageProtectionPolicy = PcdGet32(PcdImageProtectionPolicy);\r | |
755 | \r | |
756 | if (mImageProtectionPolicy != 0) {\r | |
757 | Status = CoreCreateEvent (\r | |
758 | EVT_NOTIFY_SIGNAL,\r | |
759 | TPL_CALLBACK,\r | |
760 | MemoryProtectionCpuArchProtocolNotify,\r | |
761 | NULL,\r | |
762 | &Event\r | |
763 | );\r | |
764 | ASSERT_EFI_ERROR(Status);\r | |
765 | \r | |
766 | //\r | |
767 | // Register for protocol notifactions on this event\r | |
768 | //\r | |
769 | Status = CoreRegisterProtocolNotify (\r | |
770 | &gEfiCpuArchProtocolGuid,\r | |
771 | Event,\r | |
772 | &Registration\r | |
773 | );\r | |
774 | ASSERT_EFI_ERROR(Status);\r | |
775 | }\r | |
776 | return ;\r | |
777 | }\r |