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[reactos.git] / reactos / ntoskrnl / mm / section.c
1 /*
2 * Copyright (C) 1998-2005 ReactOS Team (and the authors from the programmers section)
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 *
18 *
19 * PROJECT: ReactOS kernel
20 * FILE: ntoskrnl/mm/section.c
21 * PURPOSE: Implements section objects
22 *
23 * PROGRAMMERS: Rex Jolliff
24 * David Welch
25 * Eric Kohl
26 * Emanuele Aliberti
27 * Eugene Ingerman
28 * Casper Hornstrup
29 * KJK::Hyperion
30 * Guido de Jong
31 * Ge van Geldorp
32 * Royce Mitchell III
33 * Filip Navara
34 * Aleksey Bragin
35 * Jason Filby
36 * Thomas Weidenmueller
37 * Gunnar Andre' Dalsnes
38 * Mike Nordell
39 * Alex Ionescu
40 * Gregor Anich
41 * Steven Edwards
42 * Herve Poussineau
43 */
44
45 /* INCLUDES *****************************************************************/
46
47 #include <ntoskrnl.h>
48 #define NDEBUG
49 #include <debug.h>
50 #include <reactos/exeformat.h>
51
52 #if defined (ALLOC_PRAGMA)
53 #pragma alloc_text(INIT, MmCreatePhysicalMemorySection)
54 #pragma alloc_text(INIT, MmInitSectionImplementation)
55 #endif
56
57
58 /* TYPES *********************************************************************/
59
60 typedef struct
61 {
62 PROS_SECTION_OBJECT Section;
63 PMM_SECTION_SEGMENT Segment;
64 ULONG Offset;
65 BOOLEAN WasDirty;
66 BOOLEAN Private;
67 }
68 MM_SECTION_PAGEOUT_CONTEXT;
69
70 /* GLOBALS *******************************************************************/
71
72 POBJECT_TYPE MmSectionObjectType = NULL;
73
74 static GENERIC_MAPPING MmpSectionMapping = {
75 STANDARD_RIGHTS_READ | SECTION_MAP_READ | SECTION_QUERY,
76 STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE,
77 STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE,
78 SECTION_ALL_ACCESS};
79
80 #define PAGE_FROM_SSE(E) ((E) & 0xFFFFF000)
81 #define PFN_FROM_SSE(E) ((E) >> PAGE_SHIFT)
82 #define SHARE_COUNT_FROM_SSE(E) (((E) & 0x00000FFE) >> 1)
83 #define IS_SWAP_FROM_SSE(E) ((E) & 0x00000001)
84 #define MAX_SHARE_COUNT 0x7FF
85 #define MAKE_SSE(P, C) ((P) | ((C) << 1))
86 #define SWAPENTRY_FROM_SSE(E) ((E) >> 1)
87 #define MAKE_SWAP_SSE(S) (((S) << 1) | 0x1)
88
89 static const INFORMATION_CLASS_INFO ExSectionInfoClass[] =
90 {
91 ICI_SQ_SAME( sizeof(SECTION_BASIC_INFORMATION), sizeof(ULONG), ICIF_QUERY ), /* SectionBasicInformation */
92 ICI_SQ_SAME( sizeof(SECTION_IMAGE_INFORMATION), sizeof(ULONG), ICIF_QUERY ), /* SectionImageInformation */
93 };
94
95 /* FUNCTIONS *****************************************************************/
96
97 PFILE_OBJECT
98 NTAPI
99 MmGetFileObjectForSection(IN PROS_SECTION_OBJECT Section)
100 {
101 PAGED_CODE();
102 ASSERT(Section);
103
104 /* Return the file object */
105 return Section->FileObject; // Section->ControlArea->FileObject on NT
106 }
107
108 NTSTATUS
109 NTAPI
110 MmGetFileNameForSection(IN PROS_SECTION_OBJECT Section,
111 OUT POBJECT_NAME_INFORMATION *ModuleName)
112 {
113 POBJECT_NAME_INFORMATION ObjectNameInfo;
114 NTSTATUS Status;
115 ULONG ReturnLength;
116
117 /* Make sure it's an image section */
118 *ModuleName = NULL;
119 if (!(Section->AllocationAttributes & SEC_IMAGE))
120 {
121 /* It's not, fail */
122 return STATUS_SECTION_NOT_IMAGE;
123 }
124
125 /* Allocate memory for our structure */
126 ObjectNameInfo = ExAllocatePoolWithTag(PagedPool,
127 1024,
128 TAG('M', 'm', ' ', ' '));
129 if (!ObjectNameInfo) return STATUS_NO_MEMORY;
130
131 /* Query the name */
132 Status = ObQueryNameString(Section->FileObject,
133 ObjectNameInfo,
134 1024,
135 &ReturnLength);
136 if (!NT_SUCCESS(Status))
137 {
138 /* Failed, free memory */
139 ExFreePoolWithTag(ObjectNameInfo, TAG('M', 'm', ' ', ' '));
140 return Status;
141 }
142
143 /* Success */
144 *ModuleName = ObjectNameInfo;
145 return STATUS_SUCCESS;
146 }
147
148 NTSTATUS
149 NTAPI
150 MmGetFileNameForAddress(IN PVOID Address,
151 OUT PUNICODE_STRING ModuleName)
152 {
153 PROS_SECTION_OBJECT Section;
154 PMEMORY_AREA MemoryArea;
155 PMMSUPPORT AddressSpace;
156 POBJECT_NAME_INFORMATION ModuleNameInformation;
157 NTSTATUS Status = STATUS_ADDRESS_NOT_ASSOCIATED;
158
159 /* Get the MM_AVL_TABLE from EPROCESS */
160 if (Address >= MmSystemRangeStart)
161 {
162 AddressSpace = MmGetKernelAddressSpace();
163 }
164 else
165 {
166 AddressSpace = &PsGetCurrentProcess()->Vm;
167 }
168
169 /* Lock address space */
170 MmLockAddressSpace(AddressSpace);
171
172 /* Locate the memory area for the process by address */
173 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, Address);
174
175 /* Make sure it's a section view type */
176 if ((MemoryArea != NULL) && (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW))
177 {
178 /* Get the section pointer to the SECTION_OBJECT */
179 Section = MemoryArea->Data.SectionData.Section;
180
181 /* Unlock address space */
182 MmUnlockAddressSpace(AddressSpace);
183
184 /* Get the filename of the section */
185 Status = MmGetFileNameForSection(Section,&ModuleNameInformation);
186
187 if (NT_SUCCESS(Status))
188 {
189 /* Init modulename */
190 RtlCreateUnicodeString(ModuleName,
191 ModuleNameInformation->Name.Buffer);
192
193 /* Free temp taged buffer from MmGetFileNameForSection() */
194 ExFreePoolWithTag(ModuleNameInformation, TAG('M', 'm', ' ', ' '));
195 DPRINT("Found ModuleName %S by address %p\n",
196 ModuleName->Buffer,Address);
197 }
198 }
199 else
200 {
201 /* Unlock address space */
202 MmUnlockAddressSpace(AddressSpace);
203 }
204
205 return Status;
206 }
207
208 /* Note: Mmsp prefix denotes "Memory Manager Section Private". */
209
210 /*
211 * FUNCTION: Waits in kernel mode up to ten seconds for an MM_PAGEOP event.
212 * ARGUMENTS: PMM_PAGEOP which event we should wait for.
213 * RETURNS: Status of the wait.
214 */
215 static NTSTATUS
216 MmspWaitForPageOpCompletionEvent(PMM_PAGEOP PageOp)
217 {
218 LARGE_INTEGER Timeout;
219 #ifdef __GNUC__ /* TODO: Use other macro to check for suffix to use? */
220
221 Timeout.QuadPart = -100000000LL; // 10 sec
222 #else
223
224 Timeout.QuadPart = -100000000; // 10 sec
225 #endif
226
227 return KeWaitForSingleObject(&PageOp->CompletionEvent, 0, KernelMode, FALSE, &Timeout);
228 }
229
230
231 /*
232 * FUNCTION: Sets the page op completion event and releases the page op.
233 * ARGUMENTS: PMM_PAGEOP.
234 * RETURNS: In shorter time than it takes you to even read this
235 * description, so don't even think about geting a mug of coffee.
236 */
237 static void
238 MmspCompleteAndReleasePageOp(PMM_PAGEOP PageOp)
239 {
240 KeSetEvent(&PageOp->CompletionEvent, IO_NO_INCREMENT, FALSE);
241 MmReleasePageOp(PageOp);
242 }
243
244
245 /*
246 * FUNCTION: Waits in kernel mode indefinitely for a file object lock.
247 * ARGUMENTS: PFILE_OBJECT to wait for.
248 * RETURNS: Status of the wait.
249 */
250 static NTSTATUS
251 MmspWaitForFileLock(PFILE_OBJECT File)
252 {
253 return STATUS_SUCCESS;
254 //return KeWaitForSingleObject(&File->Lock, 0, KernelMode, FALSE, NULL);
255 }
256
257
258 VOID
259 MmFreePageTablesSectionSegment(PMM_SECTION_SEGMENT Segment)
260 {
261 ULONG i;
262 if (Segment->Length > NR_SECTION_PAGE_TABLES * PAGE_SIZE)
263 {
264 for (i = 0; i < NR_SECTION_PAGE_TABLES; i++)
265 {
266 if (Segment->PageDirectory.PageTables[i] != NULL)
267 {
268 ExFreePool(Segment->PageDirectory.PageTables[i]);
269 }
270 }
271 }
272 }
273
274 VOID
275 NTAPI
276 MmFreeSectionSegments(PFILE_OBJECT FileObject)
277 {
278 if (FileObject->SectionObjectPointer->ImageSectionObject != NULL)
279 {
280 PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
281 PMM_SECTION_SEGMENT SectionSegments;
282 ULONG NrSegments;
283 ULONG i;
284
285 ImageSectionObject = (PMM_IMAGE_SECTION_OBJECT)FileObject->SectionObjectPointer->ImageSectionObject;
286 NrSegments = ImageSectionObject->NrSegments;
287 SectionSegments = ImageSectionObject->Segments;
288 for (i = 0; i < NrSegments; i++)
289 {
290 if (SectionSegments[i].ReferenceCount != 0)
291 {
292 DPRINT1("Image segment %d still referenced (was %d)\n", i,
293 SectionSegments[i].ReferenceCount);
294 KeBugCheck(MEMORY_MANAGEMENT);
295 }
296 MmFreePageTablesSectionSegment(&SectionSegments[i]);
297 }
298 ExFreePool(ImageSectionObject->Segments);
299 ExFreePool(ImageSectionObject);
300 FileObject->SectionObjectPointer->ImageSectionObject = NULL;
301 }
302 if (FileObject->SectionObjectPointer->DataSectionObject != NULL)
303 {
304 PMM_SECTION_SEGMENT Segment;
305
306 Segment = (PMM_SECTION_SEGMENT)FileObject->SectionObjectPointer->
307 DataSectionObject;
308
309 if (Segment->ReferenceCount != 0)
310 {
311 DPRINT1("Data segment still referenced\n");
312 KeBugCheck(MEMORY_MANAGEMENT);
313 }
314 MmFreePageTablesSectionSegment(Segment);
315 ExFreePool(Segment);
316 FileObject->SectionObjectPointer->DataSectionObject = NULL;
317 }
318 }
319
320 VOID
321 NTAPI
322 MmLockSectionSegment(PMM_SECTION_SEGMENT Segment)
323 {
324 ExAcquireFastMutex(&Segment->Lock);
325 }
326
327 VOID
328 NTAPI
329 MmUnlockSectionSegment(PMM_SECTION_SEGMENT Segment)
330 {
331 ExReleaseFastMutex(&Segment->Lock);
332 }
333
334 VOID
335 NTAPI
336 MmSetPageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
337 ULONG Offset,
338 ULONG Entry)
339 {
340 PSECTION_PAGE_TABLE Table;
341 ULONG DirectoryOffset;
342 ULONG TableOffset;
343
344 if (Segment->Length <= NR_SECTION_PAGE_TABLES * PAGE_SIZE)
345 {
346 Table = (PSECTION_PAGE_TABLE)&Segment->PageDirectory;
347 }
348 else
349 {
350 DirectoryOffset = PAGE_TO_SECTION_PAGE_DIRECTORY_OFFSET(Offset);
351 Table = Segment->PageDirectory.PageTables[DirectoryOffset];
352 if (Table == NULL)
353 {
354 Table =
355 Segment->PageDirectory.PageTables[DirectoryOffset] =
356 ExAllocatePoolWithTag(NonPagedPool, sizeof(SECTION_PAGE_TABLE),
357 TAG_SECTION_PAGE_TABLE);
358 if (Table == NULL)
359 {
360 KeBugCheck(MEMORY_MANAGEMENT);
361 }
362 memset(Table, 0, sizeof(SECTION_PAGE_TABLE));
363 DPRINT("Table %x\n", Table);
364 }
365 }
366 TableOffset = PAGE_TO_SECTION_PAGE_TABLE_OFFSET(Offset);
367 Table->Entry[TableOffset] = Entry;
368 }
369
370
371 ULONG
372 NTAPI
373 MmGetPageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
374 ULONG Offset)
375 {
376 PSECTION_PAGE_TABLE Table;
377 ULONG Entry;
378 ULONG DirectoryOffset;
379 ULONG TableOffset;
380
381 DPRINT("MmGetPageEntrySection(Segment %x, Offset %x)\n", Segment, Offset);
382
383 if (Segment->Length <= NR_SECTION_PAGE_TABLES * PAGE_SIZE)
384 {
385 Table = (PSECTION_PAGE_TABLE)&Segment->PageDirectory;
386 }
387 else
388 {
389 DirectoryOffset = PAGE_TO_SECTION_PAGE_DIRECTORY_OFFSET(Offset);
390 Table = Segment->PageDirectory.PageTables[DirectoryOffset];
391 DPRINT("Table %x\n", Table);
392 if (Table == NULL)
393 {
394 return(0);
395 }
396 }
397 TableOffset = PAGE_TO_SECTION_PAGE_TABLE_OFFSET(Offset);
398 Entry = Table->Entry[TableOffset];
399 return(Entry);
400 }
401
402 VOID
403 NTAPI
404 MmSharePageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
405 ULONG Offset)
406 {
407 ULONG Entry;
408
409 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
410 if (Entry == 0)
411 {
412 DPRINT1("Entry == 0 for MmSharePageEntrySectionSegment\n");
413 KeBugCheck(MEMORY_MANAGEMENT);
414 }
415 if (SHARE_COUNT_FROM_SSE(Entry) == MAX_SHARE_COUNT)
416 {
417 DPRINT1("Maximum share count reached\n");
418 KeBugCheck(MEMORY_MANAGEMENT);
419 }
420 if (IS_SWAP_FROM_SSE(Entry))
421 {
422 KeBugCheck(MEMORY_MANAGEMENT);
423 }
424 Entry = MAKE_SSE(PAGE_FROM_SSE(Entry), SHARE_COUNT_FROM_SSE(Entry) + 1);
425 MmSetPageEntrySectionSegment(Segment, Offset, Entry);
426 }
427
428 BOOLEAN
429 NTAPI
430 MmUnsharePageEntrySectionSegment(PROS_SECTION_OBJECT Section,
431 PMM_SECTION_SEGMENT Segment,
432 ULONG Offset,
433 BOOLEAN Dirty,
434 BOOLEAN PageOut)
435 {
436 ULONG Entry;
437 BOOLEAN IsDirectMapped = FALSE;
438
439 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
440 if (Entry == 0)
441 {
442 DPRINT1("Entry == 0 for MmUnsharePageEntrySectionSegment\n");
443 KeBugCheck(MEMORY_MANAGEMENT);
444 }
445 if (SHARE_COUNT_FROM_SSE(Entry) == 0)
446 {
447 DPRINT1("Zero share count for unshare\n");
448 KeBugCheck(MEMORY_MANAGEMENT);
449 }
450 if (IS_SWAP_FROM_SSE(Entry))
451 {
452 KeBugCheck(MEMORY_MANAGEMENT);
453 }
454 Entry = MAKE_SSE(PAGE_FROM_SSE(Entry), SHARE_COUNT_FROM_SSE(Entry) - 1);
455 /*
456 * If we reducing the share count of this entry to zero then set the entry
457 * to zero and tell the cache the page is no longer mapped.
458 */
459 if (SHARE_COUNT_FROM_SSE(Entry) == 0)
460 {
461 PFILE_OBJECT FileObject;
462 PBCB Bcb;
463 SWAPENTRY SavedSwapEntry;
464 PFN_TYPE Page;
465 BOOLEAN IsImageSection;
466 ULONG FileOffset;
467
468 FileOffset = Offset + Segment->FileOffset;
469
470 IsImageSection = Section->AllocationAttributes & SEC_IMAGE ? TRUE : FALSE;
471
472 Page = PFN_FROM_SSE(Entry);
473 FileObject = Section->FileObject;
474 if (FileObject != NULL &&
475 !(Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
476 {
477
478 if ((FileOffset % PAGE_SIZE) == 0 &&
479 (Offset + PAGE_SIZE <= Segment->RawLength || !IsImageSection))
480 {
481 NTSTATUS Status;
482 Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
483 IsDirectMapped = TRUE;
484 Status = CcRosUnmapCacheSegment(Bcb, FileOffset, Dirty);
485 if (!NT_SUCCESS(Status))
486 {
487 DPRINT1("CcRosUnmapCacheSegment failed, status = %x\n", Status);
488 KeBugCheck(MEMORY_MANAGEMENT);
489 }
490 }
491 }
492
493 SavedSwapEntry = MmGetSavedSwapEntryPage(Page);
494 if (SavedSwapEntry == 0)
495 {
496 if (!PageOut &&
497 ((Segment->Flags & MM_PAGEFILE_SEGMENT) ||
498 (Segment->Characteristics & IMAGE_SCN_MEM_SHARED)))
499 {
500 /*
501 * FIXME:
502 * Try to page out this page and set the swap entry
503 * within the section segment. There exist no rmap entry
504 * for this page. The pager thread can't page out a
505 * page without a rmap entry.
506 */
507 MmSetPageEntrySectionSegment(Segment, Offset, Entry);
508 }
509 else
510 {
511 MmSetPageEntrySectionSegment(Segment, Offset, 0);
512 if (!IsDirectMapped)
513 {
514 MmReleasePageMemoryConsumer(MC_USER, Page);
515 }
516 }
517 }
518 else
519 {
520 if ((Segment->Flags & MM_PAGEFILE_SEGMENT) ||
521 (Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
522 {
523 if (!PageOut)
524 {
525 if (Dirty)
526 {
527 /*
528 * FIXME:
529 * We hold all locks. Nobody can do something with the current
530 * process and the current segment (also not within an other process).
531 */
532 NTSTATUS Status;
533 Status = MmWriteToSwapPage(SavedSwapEntry, Page);
534 if (!NT_SUCCESS(Status))
535 {
536 DPRINT1("MM: Failed to write to swap page (Status was 0x%.8X)\n", Status);
537 KeBugCheck(MEMORY_MANAGEMENT);
538 }
539 }
540 MmSetPageEntrySectionSegment(Segment, Offset, MAKE_SWAP_SSE(SavedSwapEntry));
541 MmSetSavedSwapEntryPage(Page, 0);
542 }
543 MmReleasePageMemoryConsumer(MC_USER, Page);
544 }
545 else
546 {
547 DPRINT1("Found a swapentry for a non private page in an image or data file sgment\n");
548 KeBugCheck(MEMORY_MANAGEMENT);
549 }
550 }
551 }
552 else
553 {
554 MmSetPageEntrySectionSegment(Segment, Offset, Entry);
555 }
556 return(SHARE_COUNT_FROM_SSE(Entry) > 0);
557 }
558
559 BOOLEAN MiIsPageFromCache(PMEMORY_AREA MemoryArea,
560 ULONG SegOffset)
561 {
562 if (!(MemoryArea->Data.SectionData.Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
563 {
564 PBCB Bcb;
565 PCACHE_SEGMENT CacheSeg;
566 Bcb = MemoryArea->Data.SectionData.Section->FileObject->SectionObjectPointer->SharedCacheMap;
567 CacheSeg = CcRosLookupCacheSegment(Bcb, SegOffset + MemoryArea->Data.SectionData.Segment->FileOffset);
568 if (CacheSeg)
569 {
570 CcRosReleaseCacheSegment(Bcb, CacheSeg, CacheSeg->Valid, FALSE, TRUE);
571 return TRUE;
572 }
573 }
574 return FALSE;
575 }
576
577 NTSTATUS
578 NTAPI
579 MiReadPage(PMEMORY_AREA MemoryArea,
580 ULONG SegOffset,
581 PPFN_TYPE Page)
582 /*
583 * FUNCTION: Read a page for a section backed memory area.
584 * PARAMETERS:
585 * MemoryArea - Memory area to read the page for.
586 * Offset - Offset of the page to read.
587 * Page - Variable that receives a page contains the read data.
588 */
589 {
590 ULONG BaseOffset;
591 ULONG FileOffset;
592 PVOID BaseAddress;
593 BOOLEAN UptoDate;
594 PCACHE_SEGMENT CacheSeg;
595 PFILE_OBJECT FileObject;
596 NTSTATUS Status;
597 ULONG RawLength;
598 PBCB Bcb;
599 BOOLEAN IsImageSection;
600 ULONG Length;
601
602 FileObject = MemoryArea->Data.SectionData.Section->FileObject;
603 Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
604 RawLength = MemoryArea->Data.SectionData.Segment->RawLength;
605 FileOffset = SegOffset + MemoryArea->Data.SectionData.Segment->FileOffset;
606 IsImageSection = MemoryArea->Data.SectionData.Section->AllocationAttributes & SEC_IMAGE ? TRUE : FALSE;
607
608 ASSERT(Bcb);
609
610 DPRINT("%S %x\n", FileObject->FileName.Buffer, FileOffset);
611
612 /*
613 * If the file system is letting us go directly to the cache and the
614 * memory area was mapped at an offset in the file which is page aligned
615 * then get the related cache segment.
616 */
617 if ((FileOffset % PAGE_SIZE) == 0 &&
618 (SegOffset + PAGE_SIZE <= RawLength || !IsImageSection) &&
619 !(MemoryArea->Data.SectionData.Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
620 {
621
622 /*
623 * Get the related cache segment; we use a lower level interface than
624 * filesystems do because it is safe for us to use an offset with a
625 * alignment less than the file system block size.
626 */
627 Status = CcRosGetCacheSegment(Bcb,
628 FileOffset,
629 &BaseOffset,
630 &BaseAddress,
631 &UptoDate,
632 &CacheSeg);
633 if (!NT_SUCCESS(Status))
634 {
635 return(Status);
636 }
637 if (!UptoDate)
638 {
639 /*
640 * If the cache segment isn't up to date then call the file
641 * system to read in the data.
642 */
643 Status = ReadCacheSegment(CacheSeg);
644 if (!NT_SUCCESS(Status))
645 {
646 CcRosReleaseCacheSegment(Bcb, CacheSeg, FALSE, FALSE, FALSE);
647 return Status;
648 }
649 }
650 /*
651 * Retrieve the page from the cache segment that we actually want.
652 */
653 (*Page) = MmGetPhysicalAddress((char*)BaseAddress +
654 FileOffset - BaseOffset).LowPart >> PAGE_SHIFT;
655
656 CcRosReleaseCacheSegment(Bcb, CacheSeg, TRUE, FALSE, TRUE);
657 }
658 else
659 {
660 PEPROCESS Process;
661 KIRQL Irql;
662 PVOID PageAddr;
663 ULONG CacheSegOffset;
664
665 /*
666 * Allocate a page, this is rather complicated by the possibility
667 * we might have to move other things out of memory
668 */
669 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, Page);
670 if (!NT_SUCCESS(Status))
671 {
672 return(Status);
673 }
674 Status = CcRosGetCacheSegment(Bcb,
675 FileOffset,
676 &BaseOffset,
677 &BaseAddress,
678 &UptoDate,
679 &CacheSeg);
680 if (!NT_SUCCESS(Status))
681 {
682 return(Status);
683 }
684 if (!UptoDate)
685 {
686 /*
687 * If the cache segment isn't up to date then call the file
688 * system to read in the data.
689 */
690 Status = ReadCacheSegment(CacheSeg);
691 if (!NT_SUCCESS(Status))
692 {
693 CcRosReleaseCacheSegment(Bcb, CacheSeg, FALSE, FALSE, FALSE);
694 return Status;
695 }
696 }
697
698 Process = PsGetCurrentProcess();
699 PageAddr = MiMapPageInHyperSpace(Process, *Page, &Irql);
700 CacheSegOffset = BaseOffset + CacheSeg->Bcb->CacheSegmentSize - FileOffset;
701 Length = RawLength - SegOffset;
702 if (Length <= CacheSegOffset && Length <= PAGE_SIZE)
703 {
704 memcpy(PageAddr, (char*)BaseAddress + FileOffset - BaseOffset, Length);
705 }
706 else if (CacheSegOffset >= PAGE_SIZE)
707 {
708 memcpy(PageAddr, (char*)BaseAddress + FileOffset - BaseOffset, PAGE_SIZE);
709 }
710 else
711 {
712 memcpy(PageAddr, (char*)BaseAddress + FileOffset - BaseOffset, CacheSegOffset);
713 MiUnmapPageInHyperSpace(Process, PageAddr, Irql);
714 CcRosReleaseCacheSegment(Bcb, CacheSeg, TRUE, FALSE, FALSE);
715 Status = CcRosGetCacheSegment(Bcb,
716 FileOffset + CacheSegOffset,
717 &BaseOffset,
718 &BaseAddress,
719 &UptoDate,
720 &CacheSeg);
721 if (!NT_SUCCESS(Status))
722 {
723 return(Status);
724 }
725 if (!UptoDate)
726 {
727 /*
728 * If the cache segment isn't up to date then call the file
729 * system to read in the data.
730 */
731 Status = ReadCacheSegment(CacheSeg);
732 if (!NT_SUCCESS(Status))
733 {
734 CcRosReleaseCacheSegment(Bcb, CacheSeg, FALSE, FALSE, FALSE);
735 return Status;
736 }
737 }
738 PageAddr = MiMapPageInHyperSpace(Process, *Page, &Irql);
739 if (Length < PAGE_SIZE)
740 {
741 memcpy((char*)PageAddr + CacheSegOffset, BaseAddress, Length - CacheSegOffset);
742 }
743 else
744 {
745 memcpy((char*)PageAddr + CacheSegOffset, BaseAddress, PAGE_SIZE - CacheSegOffset);
746 }
747 }
748 MiUnmapPageInHyperSpace(Process, PageAddr, Irql);
749 CcRosReleaseCacheSegment(Bcb, CacheSeg, TRUE, FALSE, FALSE);
750 }
751 return(STATUS_SUCCESS);
752 }
753
754 NTSTATUS
755 NTAPI
756 MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
757 MEMORY_AREA* MemoryArea,
758 PVOID Address,
759 BOOLEAN Locked)
760 {
761 ULONG Offset;
762 PFN_TYPE Page;
763 NTSTATUS Status;
764 PVOID PAddress;
765 PROS_SECTION_OBJECT Section;
766 PMM_SECTION_SEGMENT Segment;
767 ULONG Entry;
768 ULONG Entry1;
769 ULONG Attributes;
770 PMM_PAGEOP PageOp;
771 PMM_REGION Region;
772 BOOLEAN HasSwapEntry;
773 PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
774
775 /*
776 * There is a window between taking the page fault and locking the
777 * address space when another thread could load the page so we check
778 * that.
779 */
780 if (MmIsPagePresent(Process, Address))
781 {
782 if (Locked)
783 {
784 MmLockPage(MmGetPfnForProcess(Process, Address));
785 }
786 return(STATUS_SUCCESS);
787 }
788
789 PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
790 Offset = (ULONG_PTR)PAddress - (ULONG_PTR)MemoryArea->StartingAddress
791 + MemoryArea->Data.SectionData.ViewOffset;
792
793 Segment = MemoryArea->Data.SectionData.Segment;
794 Section = MemoryArea->Data.SectionData.Section;
795 Region = MmFindRegion(MemoryArea->StartingAddress,
796 &MemoryArea->Data.SectionData.RegionListHead,
797 Address, NULL);
798 /*
799 * Lock the segment
800 */
801 MmLockSectionSegment(Segment);
802
803 /*
804 * Check if this page needs to be mapped COW
805 */
806 if ((Segment->WriteCopy || MemoryArea->Data.SectionData.WriteCopyView) &&
807 (Region->Protect == PAGE_READWRITE ||
808 Region->Protect == PAGE_EXECUTE_READWRITE))
809 {
810 Attributes = Region->Protect == PAGE_READWRITE ? PAGE_READONLY : PAGE_EXECUTE_READ;
811 }
812 else
813 {
814 Attributes = Region->Protect;
815 }
816
817 /*
818 * Get or create a page operation descriptor
819 */
820 PageOp = MmGetPageOp(MemoryArea, NULL, 0, Segment, Offset, MM_PAGEOP_PAGEIN, FALSE);
821 if (PageOp == NULL)
822 {
823 DPRINT1("MmGetPageOp failed\n");
824 KeBugCheck(MEMORY_MANAGEMENT);
825 }
826
827 /*
828 * Check if someone else is already handling this fault, if so wait
829 * for them
830 */
831 if (PageOp->Thread != PsGetCurrentThread())
832 {
833 MmUnlockSectionSegment(Segment);
834 MmUnlockAddressSpace(AddressSpace);
835 Status = MmspWaitForPageOpCompletionEvent(PageOp);
836 /*
837 * Check for various strange conditions
838 */
839 if (Status != STATUS_SUCCESS)
840 {
841 DPRINT1("Failed to wait for page op, status = %x\n", Status);
842 KeBugCheck(MEMORY_MANAGEMENT);
843 }
844 if (PageOp->Status == STATUS_PENDING)
845 {
846 DPRINT1("Woke for page op before completion\n");
847 KeBugCheck(MEMORY_MANAGEMENT);
848 }
849 MmLockAddressSpace(AddressSpace);
850 /*
851 * If this wasn't a pagein then restart the operation
852 */
853 if (PageOp->OpType != MM_PAGEOP_PAGEIN)
854 {
855 MmspCompleteAndReleasePageOp(PageOp);
856 DPRINT("Address 0x%.8X\n", Address);
857 return(STATUS_MM_RESTART_OPERATION);
858 }
859
860 /*
861 * If the thread handling this fault has failed then we don't retry
862 */
863 if (!NT_SUCCESS(PageOp->Status))
864 {
865 Status = PageOp->Status;
866 MmspCompleteAndReleasePageOp(PageOp);
867 DPRINT("Address 0x%.8X\n", Address);
868 return(Status);
869 }
870 MmLockSectionSegment(Segment);
871 /*
872 * If the completed fault was for another address space then set the
873 * page in this one.
874 */
875 if (!MmIsPagePresent(Process, Address))
876 {
877 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
878 HasSwapEntry = MmIsPageSwapEntry(Process, (PVOID)PAddress);
879
880 if (PAGE_FROM_SSE(Entry) == 0 || HasSwapEntry)
881 {
882 /*
883 * The page was a private page in another or in our address space
884 */
885 MmUnlockSectionSegment(Segment);
886 MmspCompleteAndReleasePageOp(PageOp);
887 return(STATUS_MM_RESTART_OPERATION);
888 }
889
890 Page = PFN_FROM_SSE(Entry);
891
892 MmSharePageEntrySectionSegment(Segment, Offset);
893
894 /* FIXME: Should we call MmCreateVirtualMappingUnsafe if
895 * (Section->AllocationAttributes & SEC_PHYSICALMEMORY) is true?
896 */
897 Status = MmCreateVirtualMapping(Process,
898 Address,
899 Attributes,
900 &Page,
901 1);
902 if (!NT_SUCCESS(Status))
903 {
904 DPRINT1("Unable to create virtual mapping\n");
905 KeBugCheck(MEMORY_MANAGEMENT);
906 }
907 MmInsertRmap(Page, Process, (PVOID)PAddress);
908 }
909 if (Locked)
910 {
911 MmLockPage(Page);
912 }
913 MmUnlockSectionSegment(Segment);
914 PageOp->Status = STATUS_SUCCESS;
915 MmspCompleteAndReleasePageOp(PageOp);
916 DPRINT("Address 0x%.8X\n", Address);
917 return(STATUS_SUCCESS);
918 }
919
920 HasSwapEntry = MmIsPageSwapEntry(Process, (PVOID)PAddress);
921 if (HasSwapEntry)
922 {
923 /*
924 * Must be private page we have swapped out.
925 */
926 SWAPENTRY SwapEntry;
927
928 /*
929 * Sanity check
930 */
931 if (Segment->Flags & MM_PAGEFILE_SEGMENT)
932 {
933 DPRINT1("Found a swaped out private page in a pagefile section.\n");
934 KeBugCheck(MEMORY_MANAGEMENT);
935 }
936
937 MmUnlockSectionSegment(Segment);
938 MmDeletePageFileMapping(Process, (PVOID)PAddress, &SwapEntry);
939
940 MmUnlockAddressSpace(AddressSpace);
941 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
942 if (!NT_SUCCESS(Status))
943 {
944 KeBugCheck(MEMORY_MANAGEMENT);
945 }
946
947 Status = MmReadFromSwapPage(SwapEntry, Page);
948 if (!NT_SUCCESS(Status))
949 {
950 DPRINT1("MmReadFromSwapPage failed, status = %x\n", Status);
951 KeBugCheck(MEMORY_MANAGEMENT);
952 }
953 MmLockAddressSpace(AddressSpace);
954 Status = MmCreateVirtualMapping(Process,
955 Address,
956 Region->Protect,
957 &Page,
958 1);
959 if (!NT_SUCCESS(Status))
960 {
961 DPRINT("MmCreateVirtualMapping failed, not out of memory\n");
962 KeBugCheck(MEMORY_MANAGEMENT);
963 return(Status);
964 }
965
966 /*
967 * Store the swap entry for later use.
968 */
969 MmSetSavedSwapEntryPage(Page, SwapEntry);
970
971 /*
972 * Add the page to the process's working set
973 */
974 MmInsertRmap(Page, Process, (PVOID)PAddress);
975
976 /*
977 * Finish the operation
978 */
979 if (Locked)
980 {
981 MmLockPage(Page);
982 }
983 PageOp->Status = STATUS_SUCCESS;
984 MmspCompleteAndReleasePageOp(PageOp);
985 DPRINT("Address 0x%.8X\n", Address);
986 return(STATUS_SUCCESS);
987 }
988
989 /*
990 * Satisfying a page fault on a map of /Device/PhysicalMemory is easy
991 */
992 if (Section->AllocationAttributes & SEC_PHYSICALMEMORY)
993 {
994 MmUnlockSectionSegment(Segment);
995 /*
996 * Just map the desired physical page
997 */
998 Page = Offset >> PAGE_SHIFT;
999 Status = MmCreateVirtualMappingUnsafe(Process,
1000 Address,
1001 Region->Protect,
1002 &Page,
1003 1);
1004 if (!NT_SUCCESS(Status))
1005 {
1006 DPRINT("MmCreateVirtualMappingUnsafe failed, not out of memory\n");
1007 KeBugCheck(MEMORY_MANAGEMENT);
1008 return(Status);
1009 }
1010 /*
1011 * Don't add an rmap entry since the page mapped could be for
1012 * anything.
1013 */
1014 if (Locked)
1015 {
1016 MmLockPageUnsafe(Page);
1017 }
1018
1019 /*
1020 * Cleanup and release locks
1021 */
1022 PageOp->Status = STATUS_SUCCESS;
1023 MmspCompleteAndReleasePageOp(PageOp);
1024 DPRINT("Address 0x%.8X\n", Address);
1025 return(STATUS_SUCCESS);
1026 }
1027
1028 /*
1029 * Map anonymous memory for BSS sections
1030 */
1031 if (Segment->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
1032 {
1033 MmUnlockSectionSegment(Segment);
1034 Status = MmRequestPageMemoryConsumer(MC_USER, FALSE, &Page);
1035 if (!NT_SUCCESS(Status))
1036 {
1037 MmUnlockAddressSpace(AddressSpace);
1038 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
1039 MmLockAddressSpace(AddressSpace);
1040 }
1041 if (!NT_SUCCESS(Status))
1042 {
1043 KeBugCheck(MEMORY_MANAGEMENT);
1044 }
1045 Status = MmCreateVirtualMapping(Process,
1046 Address,
1047 Region->Protect,
1048 &Page,
1049 1);
1050 if (!NT_SUCCESS(Status))
1051 {
1052 DPRINT("MmCreateVirtualMapping failed, not out of memory\n");
1053 KeBugCheck(MEMORY_MANAGEMENT);
1054 return(Status);
1055 }
1056 MmInsertRmap(Page, Process, (PVOID)PAddress);
1057 if (Locked)
1058 {
1059 MmLockPage(Page);
1060 }
1061
1062 /*
1063 * Cleanup and release locks
1064 */
1065 PageOp->Status = STATUS_SUCCESS;
1066 MmspCompleteAndReleasePageOp(PageOp);
1067 DPRINT("Address 0x%.8X\n", Address);
1068 return(STATUS_SUCCESS);
1069 }
1070
1071 /*
1072 * Get the entry corresponding to the offset within the section
1073 */
1074 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
1075
1076 if (Entry == 0)
1077 {
1078 /*
1079 * If the entry is zero (and it can't change because we have
1080 * locked the segment) then we need to load the page.
1081 */
1082
1083 /*
1084 * Release all our locks and read in the page from disk
1085 */
1086 MmUnlockSectionSegment(Segment);
1087 MmUnlockAddressSpace(AddressSpace);
1088
1089 if ((Segment->Flags & MM_PAGEFILE_SEGMENT) ||
1090 (Offset >= PAGE_ROUND_UP(Segment->RawLength) && Section->AllocationAttributes & SEC_IMAGE))
1091 {
1092 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
1093 if (!NT_SUCCESS(Status))
1094 {
1095 DPRINT1("MmRequestPageMemoryConsumer failed (Status %x)\n", Status);
1096 }
1097 }
1098 else
1099 {
1100 Status = MiReadPage(MemoryArea, Offset, &Page);
1101 if (!NT_SUCCESS(Status))
1102 {
1103 DPRINT1("MiReadPage failed (Status %x)\n", Status);
1104 }
1105 }
1106 if (!NT_SUCCESS(Status))
1107 {
1108 /*
1109 * FIXME: What do we know in this case?
1110 */
1111 /*
1112 * Cleanup and release locks
1113 */
1114 MmLockAddressSpace(AddressSpace);
1115 PageOp->Status = Status;
1116 MmspCompleteAndReleasePageOp(PageOp);
1117 DPRINT("Address 0x%.8X\n", Address);
1118 return(Status);
1119 }
1120 /*
1121 * Relock the address space and segment
1122 */
1123 MmLockAddressSpace(AddressSpace);
1124 MmLockSectionSegment(Segment);
1125
1126 /*
1127 * Check the entry. No one should change the status of a page
1128 * that has a pending page-in.
1129 */
1130 Entry1 = MmGetPageEntrySectionSegment(Segment, Offset);
1131 if (Entry != Entry1)
1132 {
1133 DPRINT1("Someone changed ppte entry while we slept\n");
1134 KeBugCheck(MEMORY_MANAGEMENT);
1135 }
1136
1137 /*
1138 * Mark the offset within the section as having valid, in-memory
1139 * data
1140 */
1141 Entry = MAKE_SSE(Page << PAGE_SHIFT, 1);
1142 MmSetPageEntrySectionSegment(Segment, Offset, Entry);
1143 MmUnlockSectionSegment(Segment);
1144
1145 Status = MmCreateVirtualMapping(Process,
1146 Address,
1147 Attributes,
1148 &Page,
1149 1);
1150 if (!NT_SUCCESS(Status))
1151 {
1152 DPRINT1("Unable to create virtual mapping\n");
1153 KeBugCheck(MEMORY_MANAGEMENT);
1154 }
1155 MmInsertRmap(Page, Process, (PVOID)PAddress);
1156
1157 if (Locked)
1158 {
1159 MmLockPage(Page);
1160 }
1161 PageOp->Status = STATUS_SUCCESS;
1162 MmspCompleteAndReleasePageOp(PageOp);
1163 DPRINT("Address 0x%.8X\n", Address);
1164 return(STATUS_SUCCESS);
1165 }
1166 else if (IS_SWAP_FROM_SSE(Entry))
1167 {
1168 SWAPENTRY SwapEntry;
1169
1170 SwapEntry = SWAPENTRY_FROM_SSE(Entry);
1171
1172 /*
1173 * Release all our locks and read in the page from disk
1174 */
1175 MmUnlockSectionSegment(Segment);
1176
1177 MmUnlockAddressSpace(AddressSpace);
1178
1179 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
1180 if (!NT_SUCCESS(Status))
1181 {
1182 KeBugCheck(MEMORY_MANAGEMENT);
1183 }
1184
1185 Status = MmReadFromSwapPage(SwapEntry, Page);
1186 if (!NT_SUCCESS(Status))
1187 {
1188 KeBugCheck(MEMORY_MANAGEMENT);
1189 }
1190
1191 /*
1192 * Relock the address space and segment
1193 */
1194 MmLockAddressSpace(AddressSpace);
1195 MmLockSectionSegment(Segment);
1196
1197 /*
1198 * Check the entry. No one should change the status of a page
1199 * that has a pending page-in.
1200 */
1201 Entry1 = MmGetPageEntrySectionSegment(Segment, Offset);
1202 if (Entry != Entry1)
1203 {
1204 DPRINT1("Someone changed ppte entry while we slept\n");
1205 KeBugCheck(MEMORY_MANAGEMENT);
1206 }
1207
1208 /*
1209 * Mark the offset within the section as having valid, in-memory
1210 * data
1211 */
1212 Entry = MAKE_SSE(Page << PAGE_SHIFT, 1);
1213 MmSetPageEntrySectionSegment(Segment, Offset, Entry);
1214 MmUnlockSectionSegment(Segment);
1215
1216 /*
1217 * Save the swap entry.
1218 */
1219 MmSetSavedSwapEntryPage(Page, SwapEntry);
1220 Status = MmCreateVirtualMapping(Process,
1221 Address,
1222 Region->Protect,
1223 &Page,
1224 1);
1225 if (!NT_SUCCESS(Status))
1226 {
1227 DPRINT1("Unable to create virtual mapping\n");
1228 KeBugCheck(MEMORY_MANAGEMENT);
1229 }
1230 MmInsertRmap(Page, Process, (PVOID)PAddress);
1231 if (Locked)
1232 {
1233 MmLockPage(Page);
1234 }
1235 PageOp->Status = STATUS_SUCCESS;
1236 MmspCompleteAndReleasePageOp(PageOp);
1237 DPRINT("Address 0x%.8X\n", Address);
1238 return(STATUS_SUCCESS);
1239 }
1240 else
1241 {
1242 /*
1243 * If the section offset is already in-memory and valid then just
1244 * take another reference to the page
1245 */
1246
1247 Page = PFN_FROM_SSE(Entry);
1248
1249 MmSharePageEntrySectionSegment(Segment, Offset);
1250 MmUnlockSectionSegment(Segment);
1251
1252 Status = MmCreateVirtualMapping(Process,
1253 Address,
1254 Attributes,
1255 &Page,
1256 1);
1257 if (!NT_SUCCESS(Status))
1258 {
1259 DPRINT1("Unable to create virtual mapping\n");
1260 KeBugCheck(MEMORY_MANAGEMENT);
1261 }
1262 MmInsertRmap(Page, Process, (PVOID)PAddress);
1263 if (Locked)
1264 {
1265 MmLockPage(Page);
1266 }
1267 PageOp->Status = STATUS_SUCCESS;
1268 MmspCompleteAndReleasePageOp(PageOp);
1269 DPRINT("Address 0x%.8X\n", Address);
1270 return(STATUS_SUCCESS);
1271 }
1272 }
1273
1274 NTSTATUS
1275 NTAPI
1276 MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
1277 MEMORY_AREA* MemoryArea,
1278 PVOID Address,
1279 BOOLEAN Locked)
1280 {
1281 PMM_SECTION_SEGMENT Segment;
1282 PROS_SECTION_OBJECT Section;
1283 PFN_TYPE OldPage;
1284 PFN_TYPE NewPage;
1285 NTSTATUS Status;
1286 PVOID PAddress;
1287 ULONG Offset;
1288 PMM_PAGEOP PageOp;
1289 PMM_REGION Region;
1290 ULONG Entry;
1291 PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
1292
1293 DPRINT("MmAccessFaultSectionView(%x, %x, %x, %x)\n", AddressSpace, MemoryArea, Address, Locked);
1294
1295 /*
1296 * Check if the page has been paged out or has already been set readwrite
1297 */
1298 if (!MmIsPagePresent(Process, Address) ||
1299 MmGetPageProtect(Process, Address) & PAGE_READWRITE)
1300 {
1301 DPRINT("Address 0x%.8X\n", Address);
1302 return(STATUS_SUCCESS);
1303 }
1304
1305 /*
1306 * Find the offset of the page
1307 */
1308 PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
1309 Offset = (ULONG_PTR)PAddress - (ULONG_PTR)MemoryArea->StartingAddress
1310 + MemoryArea->Data.SectionData.ViewOffset;
1311
1312 Segment = MemoryArea->Data.SectionData.Segment;
1313 Section = MemoryArea->Data.SectionData.Section;
1314 Region = MmFindRegion(MemoryArea->StartingAddress,
1315 &MemoryArea->Data.SectionData.RegionListHead,
1316 Address, NULL);
1317 /*
1318 * Lock the segment
1319 */
1320 MmLockSectionSegment(Segment);
1321
1322 OldPage = MmGetPfnForProcess(NULL, Address);
1323 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
1324
1325 MmUnlockSectionSegment(Segment);
1326
1327 /*
1328 * Check if we are doing COW
1329 */
1330 if (!((Segment->WriteCopy || MemoryArea->Data.SectionData.WriteCopyView) &&
1331 (Region->Protect == PAGE_READWRITE ||
1332 Region->Protect == PAGE_EXECUTE_READWRITE)))
1333 {
1334 DPRINT("Address 0x%.8X\n", Address);
1335 return(STATUS_ACCESS_VIOLATION);
1336 }
1337
1338 if (IS_SWAP_FROM_SSE(Entry) ||
1339 PFN_FROM_SSE(Entry) != OldPage)
1340 {
1341 /* This is a private page. We must only change the page protection. */
1342 MmSetPageProtect(Process, PAddress, Region->Protect);
1343 return(STATUS_SUCCESS);
1344 }
1345
1346 /*
1347 * Get or create a pageop
1348 */
1349 PageOp = MmGetPageOp(MemoryArea, NULL, 0, Segment, Offset,
1350 MM_PAGEOP_ACCESSFAULT, FALSE);
1351 if (PageOp == NULL)
1352 {
1353 DPRINT1("MmGetPageOp failed\n");
1354 KeBugCheck(MEMORY_MANAGEMENT);
1355 }
1356
1357 /*
1358 * Wait for any other operations to complete
1359 */
1360 if (PageOp->Thread != PsGetCurrentThread())
1361 {
1362 MmUnlockAddressSpace(AddressSpace);
1363 Status = MmspWaitForPageOpCompletionEvent(PageOp);
1364 /*
1365 * Check for various strange conditions
1366 */
1367 if (Status == STATUS_TIMEOUT)
1368 {
1369 DPRINT1("Failed to wait for page op, status = %x\n", Status);
1370 KeBugCheck(MEMORY_MANAGEMENT);
1371 }
1372 if (PageOp->Status == STATUS_PENDING)
1373 {
1374 DPRINT1("Woke for page op before completion\n");
1375 KeBugCheck(MEMORY_MANAGEMENT);
1376 }
1377 /*
1378 * Restart the operation
1379 */
1380 MmLockAddressSpace(AddressSpace);
1381 MmspCompleteAndReleasePageOp(PageOp);
1382 DPRINT("Address 0x%.8X\n", Address);
1383 return(STATUS_MM_RESTART_OPERATION);
1384 }
1385
1386 /*
1387 * Release locks now we have the pageop
1388 */
1389 MmUnlockAddressSpace(AddressSpace);
1390
1391 /*
1392 * Allocate a page
1393 */
1394 Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &NewPage);
1395 if (!NT_SUCCESS(Status))
1396 {
1397 KeBugCheck(MEMORY_MANAGEMENT);
1398 }
1399
1400 /*
1401 * Copy the old page
1402 */
1403 MiCopyFromUserPage(NewPage, PAddress);
1404
1405 MmLockAddressSpace(AddressSpace);
1406 /*
1407 * Delete the old entry.
1408 */
1409 MmDeleteVirtualMapping(Process, Address, FALSE, NULL, NULL);
1410
1411 /*
1412 * Set the PTE to point to the new page
1413 */
1414 Status = MmCreateVirtualMapping(Process,
1415 Address,
1416 Region->Protect,
1417 &NewPage,
1418 1);
1419 if (!NT_SUCCESS(Status))
1420 {
1421 DPRINT("MmCreateVirtualMapping failed, not out of memory\n");
1422 KeBugCheck(MEMORY_MANAGEMENT);
1423 return(Status);
1424 }
1425 if (!NT_SUCCESS(Status))
1426 {
1427 DPRINT1("Unable to create virtual mapping\n");
1428 KeBugCheck(MEMORY_MANAGEMENT);
1429 }
1430 if (Locked)
1431 {
1432 MmLockPage(NewPage);
1433 MmUnlockPage(OldPage);
1434 }
1435
1436 /*
1437 * Unshare the old page.
1438 */
1439 MmDeleteRmap(OldPage, Process, PAddress);
1440 MmInsertRmap(NewPage, Process, PAddress);
1441 MmLockSectionSegment(Segment);
1442 MmUnsharePageEntrySectionSegment(Section, Segment, Offset, FALSE, FALSE);
1443 MmUnlockSectionSegment(Segment);
1444
1445 PageOp->Status = STATUS_SUCCESS;
1446 MmspCompleteAndReleasePageOp(PageOp);
1447 DPRINT("Address 0x%.8X\n", Address);
1448 return(STATUS_SUCCESS);
1449 }
1450
1451 VOID
1452 MmPageOutDeleteMapping(PVOID Context, PEPROCESS Process, PVOID Address)
1453 {
1454 MM_SECTION_PAGEOUT_CONTEXT* PageOutContext;
1455 BOOLEAN WasDirty;
1456 PFN_TYPE Page;
1457
1458 PageOutContext = (MM_SECTION_PAGEOUT_CONTEXT*)Context;
1459 if (Process)
1460 {
1461 MmLockAddressSpace(&Process->Vm);
1462 }
1463
1464 MmDeleteVirtualMapping(Process,
1465 Address,
1466 FALSE,
1467 &WasDirty,
1468 &Page);
1469 if (WasDirty)
1470 {
1471 PageOutContext->WasDirty = TRUE;
1472 }
1473 if (!PageOutContext->Private)
1474 {
1475 MmLockSectionSegment(PageOutContext->Segment);
1476 MmUnsharePageEntrySectionSegment((PROS_SECTION_OBJECT)PageOutContext->Section,
1477 PageOutContext->Segment,
1478 PageOutContext->Offset,
1479 PageOutContext->WasDirty,
1480 TRUE);
1481 MmUnlockSectionSegment(PageOutContext->Segment);
1482 }
1483 if (Process)
1484 {
1485 MmUnlockAddressSpace(&Process->Vm);
1486 }
1487
1488 if (PageOutContext->Private)
1489 {
1490 MmReleasePageMemoryConsumer(MC_USER, Page);
1491 }
1492
1493 DPRINT("PhysicalAddress %x, Address %x\n", Page << PAGE_SHIFT, Address);
1494 }
1495
1496 NTSTATUS
1497 NTAPI
1498 MmPageOutSectionView(PMMSUPPORT AddressSpace,
1499 MEMORY_AREA* MemoryArea,
1500 PVOID Address,
1501 PMM_PAGEOP PageOp)
1502 {
1503 PFN_TYPE Page;
1504 MM_SECTION_PAGEOUT_CONTEXT Context;
1505 SWAPENTRY SwapEntry;
1506 ULONG Entry;
1507 ULONG FileOffset;
1508 NTSTATUS Status;
1509 PFILE_OBJECT FileObject;
1510 PBCB Bcb = NULL;
1511 BOOLEAN DirectMapped;
1512 BOOLEAN IsImageSection;
1513 PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
1514
1515 Address = (PVOID)PAGE_ROUND_DOWN(Address);
1516
1517 /*
1518 * Get the segment and section.
1519 */
1520 Context.Segment = MemoryArea->Data.SectionData.Segment;
1521 Context.Section = MemoryArea->Data.SectionData.Section;
1522
1523 Context.Offset = (ULONG_PTR)Address - (ULONG_PTR)MemoryArea->StartingAddress
1524 + MemoryArea->Data.SectionData.ViewOffset;
1525 FileOffset = Context.Offset + Context.Segment->FileOffset;
1526
1527 IsImageSection = Context.Section->AllocationAttributes & SEC_IMAGE ? TRUE : FALSE;
1528
1529 FileObject = Context.Section->FileObject;
1530 DirectMapped = FALSE;
1531 if (FileObject != NULL &&
1532 !(Context.Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
1533 {
1534 Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
1535
1536 /*
1537 * If the file system is letting us go directly to the cache and the
1538 * memory area was mapped at an offset in the file which is page aligned
1539 * then note this is a direct mapped page.
1540 */
1541 if ((FileOffset % PAGE_SIZE) == 0 &&
1542 (Context.Offset + PAGE_SIZE <= Context.Segment->RawLength || !IsImageSection))
1543 {
1544 DirectMapped = TRUE;
1545 }
1546 }
1547
1548
1549 /*
1550 * This should never happen since mappings of physical memory are never
1551 * placed in the rmap lists.
1552 */
1553 if (Context.Section->AllocationAttributes & SEC_PHYSICALMEMORY)
1554 {
1555 DPRINT1("Trying to page out from physical memory section address 0x%X "
1556 "process %d\n", Address,
1557 Process ? Process->UniqueProcessId : 0);
1558 KeBugCheck(MEMORY_MANAGEMENT);
1559 }
1560
1561 /*
1562 * Get the section segment entry and the physical address.
1563 */
1564 Entry = MmGetPageEntrySectionSegment(Context.Segment, Context.Offset);
1565 if (!MmIsPagePresent(Process, Address))
1566 {
1567 DPRINT1("Trying to page out not-present page at (%d,0x%.8X).\n",
1568 Process ? Process->UniqueProcessId : 0, Address);
1569 KeBugCheck(MEMORY_MANAGEMENT);
1570 }
1571 Page = MmGetPfnForProcess(Process, Address);
1572 SwapEntry = MmGetSavedSwapEntryPage(Page);
1573
1574 /*
1575 * Prepare the context structure for the rmap delete call.
1576 */
1577 Context.WasDirty = FALSE;
1578 if (Context.Segment->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA ||
1579 IS_SWAP_FROM_SSE(Entry) ||
1580 PFN_FROM_SSE(Entry) != Page)
1581 {
1582 Context.Private = TRUE;
1583 }
1584 else
1585 {
1586 Context.Private = FALSE;
1587 }
1588
1589 /*
1590 * Take an additional reference to the page or the cache segment.
1591 */
1592 if (DirectMapped && !Context.Private)
1593 {
1594 if(!MiIsPageFromCache(MemoryArea, Context.Offset))
1595 {
1596 DPRINT1("Direct mapped non private page is not associated with the cache.\n");
1597 KeBugCheck(MEMORY_MANAGEMENT);
1598 }
1599 }
1600 else
1601 {
1602 MmReferencePage(Page);
1603 }
1604
1605 MmDeleteAllRmaps(Page, (PVOID)&Context, MmPageOutDeleteMapping);
1606
1607 /*
1608 * If this wasn't a private page then we should have reduced the entry to
1609 * zero by deleting all the rmaps.
1610 */
1611 if (!Context.Private && MmGetPageEntrySectionSegment(Context.Segment, Context.Offset) != 0)
1612 {
1613 if (!(Context.Segment->Flags & MM_PAGEFILE_SEGMENT) &&
1614 !(Context.Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
1615 {
1616 KeBugCheck(MEMORY_MANAGEMENT);
1617 }
1618 }
1619
1620 /*
1621 * If the page wasn't dirty then we can just free it as for a readonly page.
1622 * Since we unmapped all the mappings above we know it will not suddenly
1623 * become dirty.
1624 * If the page is from a pagefile section and has no swap entry,
1625 * we can't free the page at this point.
1626 */
1627 SwapEntry = MmGetSavedSwapEntryPage(Page);
1628 if (Context.Segment->Flags & MM_PAGEFILE_SEGMENT)
1629 {
1630 if (Context.Private)
1631 {
1632 DPRINT1("Found a %s private page (address %x) in a pagefile segment.\n",
1633 Context.WasDirty ? "dirty" : "clean", Address);
1634 KeBugCheck(MEMORY_MANAGEMENT);
1635 }
1636 if (!Context.WasDirty && SwapEntry != 0)
1637 {
1638 MmSetSavedSwapEntryPage(Page, 0);
1639 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, MAKE_SWAP_SSE(SwapEntry));
1640 MmReleasePageMemoryConsumer(MC_USER, Page);
1641 PageOp->Status = STATUS_SUCCESS;
1642 MmspCompleteAndReleasePageOp(PageOp);
1643 return(STATUS_SUCCESS);
1644 }
1645 }
1646 else if (Context.Segment->Characteristics & IMAGE_SCN_MEM_SHARED)
1647 {
1648 if (Context.Private)
1649 {
1650 DPRINT1("Found a %s private page (address %x) in a shared section segment.\n",
1651 Context.WasDirty ? "dirty" : "clean", Address);
1652 KeBugCheck(MEMORY_MANAGEMENT);
1653 }
1654 if (!Context.WasDirty || SwapEntry != 0)
1655 {
1656 MmSetSavedSwapEntryPage(Page, 0);
1657 if (SwapEntry != 0)
1658 {
1659 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, MAKE_SWAP_SSE(SwapEntry));
1660 }
1661 MmReleasePageMemoryConsumer(MC_USER, Page);
1662 PageOp->Status = STATUS_SUCCESS;
1663 MmspCompleteAndReleasePageOp(PageOp);
1664 return(STATUS_SUCCESS);
1665 }
1666 }
1667 else if (!Context.Private && DirectMapped)
1668 {
1669 if (SwapEntry != 0)
1670 {
1671 DPRINT1("Found a swapentry for a non private and direct mapped page (address %x)\n",
1672 Address);
1673 KeBugCheck(MEMORY_MANAGEMENT);
1674 }
1675 Status = CcRosUnmapCacheSegment(Bcb, FileOffset, FALSE);
1676 if (!NT_SUCCESS(Status))
1677 {
1678 DPRINT1("CCRosUnmapCacheSegment failed, status = %x\n", Status);
1679 KeBugCheck(MEMORY_MANAGEMENT);
1680 }
1681 PageOp->Status = STATUS_SUCCESS;
1682 MmspCompleteAndReleasePageOp(PageOp);
1683 return(STATUS_SUCCESS);
1684 }
1685 else if (!Context.WasDirty && !DirectMapped && !Context.Private)
1686 {
1687 if (SwapEntry != 0)
1688 {
1689 DPRINT1("Found a swap entry for a non dirty, non private and not direct mapped page (address %x)\n",
1690 Address);
1691 KeBugCheck(MEMORY_MANAGEMENT);
1692 }
1693 MmReleasePageMemoryConsumer(MC_USER, Page);
1694 PageOp->Status = STATUS_SUCCESS;
1695 MmspCompleteAndReleasePageOp(PageOp);
1696 return(STATUS_SUCCESS);
1697 }
1698 else if (!Context.WasDirty && Context.Private && SwapEntry != 0)
1699 {
1700 MmSetSavedSwapEntryPage(Page, 0);
1701 MmLockAddressSpace(AddressSpace);
1702 Status = MmCreatePageFileMapping(Process,
1703 Address,
1704 SwapEntry);
1705 MmUnlockAddressSpace(AddressSpace);
1706 if (!NT_SUCCESS(Status))
1707 {
1708 KeBugCheck(MEMORY_MANAGEMENT);
1709 }
1710 MmReleasePageMemoryConsumer(MC_USER, Page);
1711 PageOp->Status = STATUS_SUCCESS;
1712 MmspCompleteAndReleasePageOp(PageOp);
1713 return(STATUS_SUCCESS);
1714 }
1715
1716 /*
1717 * If necessary, allocate an entry in the paging file for this page
1718 */
1719 if (SwapEntry == 0)
1720 {
1721 SwapEntry = MmAllocSwapPage();
1722 if (SwapEntry == 0)
1723 {
1724 MmShowOutOfSpaceMessagePagingFile();
1725 MmLockAddressSpace(AddressSpace);
1726 /*
1727 * For private pages restore the old mappings.
1728 */
1729 if (Context.Private)
1730 {
1731 Status = MmCreateVirtualMapping(Process,
1732 Address,
1733 MemoryArea->Protect,
1734 &Page,
1735 1);
1736 MmSetDirtyPage(Process, Address);
1737 MmInsertRmap(Page,
1738 Process,
1739 Address);
1740 }
1741 else
1742 {
1743 /*
1744 * For non-private pages if the page wasn't direct mapped then
1745 * set it back into the section segment entry so we don't loose
1746 * our copy. Otherwise it will be handled by the cache manager.
1747 */
1748 Status = MmCreateVirtualMapping(Process,
1749 Address,
1750 MemoryArea->Protect,
1751 &Page,
1752 1);
1753 MmSetDirtyPage(Process, Address);
1754 MmInsertRmap(Page,
1755 Process,
1756 Address);
1757 Entry = MAKE_SSE(Page << PAGE_SHIFT, 1);
1758 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, Entry);
1759 }
1760 MmUnlockAddressSpace(AddressSpace);
1761 PageOp->Status = STATUS_UNSUCCESSFUL;
1762 MmspCompleteAndReleasePageOp(PageOp);
1763 return(STATUS_PAGEFILE_QUOTA);
1764 }
1765 }
1766
1767 /*
1768 * Write the page to the pagefile
1769 */
1770 Status = MmWriteToSwapPage(SwapEntry, Page);
1771 if (!NT_SUCCESS(Status))
1772 {
1773 DPRINT1("MM: Failed to write to swap page (Status was 0x%.8X)\n",
1774 Status);
1775 /*
1776 * As above: undo our actions.
1777 * FIXME: Also free the swap page.
1778 */
1779 MmLockAddressSpace(AddressSpace);
1780 if (Context.Private)
1781 {
1782 Status = MmCreateVirtualMapping(Process,
1783 Address,
1784 MemoryArea->Protect,
1785 &Page,
1786 1);
1787 MmSetDirtyPage(Process, Address);
1788 MmInsertRmap(Page,
1789 Process,
1790 Address);
1791 }
1792 else
1793 {
1794 Status = MmCreateVirtualMapping(Process,
1795 Address,
1796 MemoryArea->Protect,
1797 &Page,
1798 1);
1799 MmSetDirtyPage(Process, Address);
1800 MmInsertRmap(Page,
1801 Process,
1802 Address);
1803 Entry = MAKE_SSE(Page << PAGE_SHIFT, 1);
1804 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, Entry);
1805 }
1806 MmUnlockAddressSpace(AddressSpace);
1807 PageOp->Status = STATUS_UNSUCCESSFUL;
1808 MmspCompleteAndReleasePageOp(PageOp);
1809 return(STATUS_UNSUCCESSFUL);
1810 }
1811
1812 /*
1813 * Otherwise we have succeeded.
1814 */
1815 DPRINT("MM: Wrote section page 0x%.8X to swap!\n", Page << PAGE_SHIFT);
1816 MmSetSavedSwapEntryPage(Page, 0);
1817 if (Context.Segment->Flags & MM_PAGEFILE_SEGMENT ||
1818 Context.Segment->Characteristics & IMAGE_SCN_MEM_SHARED)
1819 {
1820 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, MAKE_SWAP_SSE(SwapEntry));
1821 }
1822 else
1823 {
1824 MmReleasePageMemoryConsumer(MC_USER, Page);
1825 }
1826
1827 if (Context.Private)
1828 {
1829 MmLockAddressSpace(AddressSpace);
1830 Status = MmCreatePageFileMapping(Process,
1831 Address,
1832 SwapEntry);
1833 MmUnlockAddressSpace(AddressSpace);
1834 if (!NT_SUCCESS(Status))
1835 {
1836 KeBugCheck(MEMORY_MANAGEMENT);
1837 }
1838 }
1839 else
1840 {
1841 Entry = MAKE_SWAP_SSE(SwapEntry);
1842 MmSetPageEntrySectionSegment(Context.Segment, Context.Offset, Entry);
1843 }
1844
1845 PageOp->Status = STATUS_SUCCESS;
1846 MmspCompleteAndReleasePageOp(PageOp);
1847 return(STATUS_SUCCESS);
1848 }
1849
1850 NTSTATUS
1851 NTAPI
1852 MmWritePageSectionView(PMMSUPPORT AddressSpace,
1853 PMEMORY_AREA MemoryArea,
1854 PVOID Address,
1855 PMM_PAGEOP PageOp)
1856 {
1857 ULONG Offset;
1858 PROS_SECTION_OBJECT Section;
1859 PMM_SECTION_SEGMENT Segment;
1860 PFN_TYPE Page;
1861 SWAPENTRY SwapEntry;
1862 ULONG Entry;
1863 BOOLEAN Private;
1864 NTSTATUS Status;
1865 PFILE_OBJECT FileObject;
1866 PBCB Bcb = NULL;
1867 BOOLEAN DirectMapped;
1868 BOOLEAN IsImageSection;
1869 PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
1870
1871 Address = (PVOID)PAGE_ROUND_DOWN(Address);
1872
1873 Offset = (ULONG_PTR)Address - (ULONG_PTR)MemoryArea->StartingAddress
1874 + MemoryArea->Data.SectionData.ViewOffset;
1875
1876 /*
1877 * Get the segment and section.
1878 */
1879 Segment = MemoryArea->Data.SectionData.Segment;
1880 Section = MemoryArea->Data.SectionData.Section;
1881 IsImageSection = Section->AllocationAttributes & SEC_IMAGE ? TRUE : FALSE;
1882
1883 FileObject = Section->FileObject;
1884 DirectMapped = FALSE;
1885 if (FileObject != NULL &&
1886 !(Segment->Characteristics & IMAGE_SCN_MEM_SHARED))
1887 {
1888 Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
1889
1890 /*
1891 * If the file system is letting us go directly to the cache and the
1892 * memory area was mapped at an offset in the file which is page aligned
1893 * then note this is a direct mapped page.
1894 */
1895 if (((Offset + Segment->FileOffset) % PAGE_SIZE) == 0 &&
1896 (Offset + PAGE_SIZE <= Segment->RawLength || !IsImageSection))
1897 {
1898 DirectMapped = TRUE;
1899 }
1900 }
1901
1902 /*
1903 * This should never happen since mappings of physical memory are never
1904 * placed in the rmap lists.
1905 */
1906 if (Section->AllocationAttributes & SEC_PHYSICALMEMORY)
1907 {
1908 DPRINT1("Trying to write back page from physical memory mapped at %X "
1909 "process %d\n", Address,
1910 Process ? Process->UniqueProcessId : 0);
1911 KeBugCheck(MEMORY_MANAGEMENT);
1912 }
1913
1914 /*
1915 * Get the section segment entry and the physical address.
1916 */
1917 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
1918 if (!MmIsPagePresent(Process, Address))
1919 {
1920 DPRINT1("Trying to page out not-present page at (%d,0x%.8X).\n",
1921 Process ? Process->UniqueProcessId : 0, Address);
1922 KeBugCheck(MEMORY_MANAGEMENT);
1923 }
1924 Page = MmGetPfnForProcess(Process, Address);
1925 SwapEntry = MmGetSavedSwapEntryPage(Page);
1926
1927 /*
1928 * Check for a private (COWed) page.
1929 */
1930 if (Segment->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA ||
1931 IS_SWAP_FROM_SSE(Entry) ||
1932 PFN_FROM_SSE(Entry) != Page)
1933 {
1934 Private = TRUE;
1935 }
1936 else
1937 {
1938 Private = FALSE;
1939 }
1940
1941 /*
1942 * Speculatively set all mappings of the page to clean.
1943 */
1944 MmSetCleanAllRmaps(Page);
1945
1946 /*
1947 * If this page was direct mapped from the cache then the cache manager
1948 * will take care of writing it back to disk.
1949 */
1950 if (DirectMapped && !Private)
1951 {
1952 ASSERT(SwapEntry == 0);
1953 CcRosMarkDirtyCacheSegment(Bcb, Offset + Segment->FileOffset);
1954 PageOp->Status = STATUS_SUCCESS;
1955 MmspCompleteAndReleasePageOp(PageOp);
1956 return(STATUS_SUCCESS);
1957 }
1958
1959 /*
1960 * If necessary, allocate an entry in the paging file for this page
1961 */
1962 if (SwapEntry == 0)
1963 {
1964 SwapEntry = MmAllocSwapPage();
1965 if (SwapEntry == 0)
1966 {
1967 MmSetDirtyAllRmaps(Page);
1968 PageOp->Status = STATUS_UNSUCCESSFUL;
1969 MmspCompleteAndReleasePageOp(PageOp);
1970 return(STATUS_PAGEFILE_QUOTA);
1971 }
1972 MmSetSavedSwapEntryPage(Page, SwapEntry);
1973 }
1974
1975 /*
1976 * Write the page to the pagefile
1977 */
1978 Status = MmWriteToSwapPage(SwapEntry, Page);
1979 if (!NT_SUCCESS(Status))
1980 {
1981 DPRINT1("MM: Failed to write to swap page (Status was 0x%.8X)\n",
1982 Status);
1983 MmSetDirtyAllRmaps(Page);
1984 PageOp->Status = STATUS_UNSUCCESSFUL;
1985 MmspCompleteAndReleasePageOp(PageOp);
1986 return(STATUS_UNSUCCESSFUL);
1987 }
1988
1989 /*
1990 * Otherwise we have succeeded.
1991 */
1992 DPRINT("MM: Wrote section page 0x%.8X to swap!\n", Page << PAGE_SHIFT);
1993 PageOp->Status = STATUS_SUCCESS;
1994 MmspCompleteAndReleasePageOp(PageOp);
1995 return(STATUS_SUCCESS);
1996 }
1997
1998 static VOID
1999 MmAlterViewAttributes(PMMSUPPORT AddressSpace,
2000 PVOID BaseAddress,
2001 ULONG RegionSize,
2002 ULONG OldType,
2003 ULONG OldProtect,
2004 ULONG NewType,
2005 ULONG NewProtect)
2006 {
2007 PMEMORY_AREA MemoryArea;
2008 PMM_SECTION_SEGMENT Segment;
2009 BOOLEAN DoCOW = FALSE;
2010 ULONG i;
2011 PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
2012
2013 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, BaseAddress);
2014 Segment = MemoryArea->Data.SectionData.Segment;
2015
2016 if ((Segment->WriteCopy || MemoryArea->Data.SectionData.WriteCopyView) &&
2017 (NewProtect == PAGE_READWRITE || NewProtect == PAGE_EXECUTE_READWRITE))
2018 {
2019 DoCOW = TRUE;
2020 }
2021
2022 if (OldProtect != NewProtect)
2023 {
2024 for (i = 0; i < PAGE_ROUND_UP(RegionSize) / PAGE_SIZE; i++)
2025 {
2026 PVOID Address = (char*)BaseAddress + (i * PAGE_SIZE);
2027 ULONG Protect = NewProtect;
2028
2029 /*
2030 * If we doing COW for this segment then check if the page is
2031 * already private.
2032 */
2033 if (DoCOW && MmIsPagePresent(Process, Address))
2034 {
2035 ULONG Offset;
2036 ULONG Entry;
2037 PFN_TYPE Page;
2038
2039 Offset = (ULONG_PTR)Address - (ULONG_PTR)MemoryArea->StartingAddress
2040 + MemoryArea->Data.SectionData.ViewOffset;
2041 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
2042 Page = MmGetPfnForProcess(Process, Address);
2043
2044 Protect = PAGE_READONLY;
2045 if (Segment->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA ||
2046 IS_SWAP_FROM_SSE(Entry) ||
2047 PFN_FROM_SSE(Entry) != Page)
2048 {
2049 Protect = NewProtect;
2050 }
2051 }
2052
2053 if (MmIsPagePresent(Process, Address))
2054 {
2055 MmSetPageProtect(Process, Address,
2056 Protect);
2057 }
2058 }
2059 }
2060 }
2061
2062 NTSTATUS
2063 NTAPI
2064 MmProtectSectionView(PMMSUPPORT AddressSpace,
2065 PMEMORY_AREA MemoryArea,
2066 PVOID BaseAddress,
2067 ULONG Length,
2068 ULONG Protect,
2069 PULONG OldProtect)
2070 {
2071 PMM_REGION Region;
2072 NTSTATUS Status;
2073 ULONG_PTR MaxLength;
2074
2075 MaxLength = (ULONG_PTR)MemoryArea->EndingAddress - (ULONG_PTR)BaseAddress;
2076 if (Length > MaxLength)
2077 Length = MaxLength;
2078
2079 Region = MmFindRegion(MemoryArea->StartingAddress,
2080 &MemoryArea->Data.SectionData.RegionListHead,
2081 BaseAddress, NULL);
2082 if ((MemoryArea->Flags & SEC_NO_CHANGE) &&
2083 Region->Protect != Protect)
2084 {
2085 return STATUS_INVALID_PAGE_PROTECTION;
2086 }
2087
2088 *OldProtect = Region->Protect;
2089 Status = MmAlterRegion(AddressSpace, MemoryArea->StartingAddress,
2090 &MemoryArea->Data.SectionData.RegionListHead,
2091 BaseAddress, Length, Region->Type, Protect,
2092 MmAlterViewAttributes);
2093
2094 return(Status);
2095 }
2096
2097 NTSTATUS NTAPI
2098 MmQuerySectionView(PMEMORY_AREA MemoryArea,
2099 PVOID Address,
2100 PMEMORY_BASIC_INFORMATION Info,
2101 PULONG ResultLength)
2102 {
2103 PMM_REGION Region;
2104 PVOID RegionBaseAddress;
2105 PROS_SECTION_OBJECT Section;
2106 PMM_SECTION_SEGMENT Segment;
2107
2108 Region = MmFindRegion((PVOID)MemoryArea->StartingAddress,
2109 &MemoryArea->Data.SectionData.RegionListHead,
2110 Address, &RegionBaseAddress);
2111 if (Region == NULL)
2112 {
2113 return STATUS_UNSUCCESSFUL;
2114 }
2115
2116 Section = MemoryArea->Data.SectionData.Section;
2117 if (Section->AllocationAttributes & SEC_IMAGE)
2118 {
2119 Segment = MemoryArea->Data.SectionData.Segment;
2120 Info->AllocationBase = (PUCHAR)MemoryArea->StartingAddress - Segment->VirtualAddress;
2121 Info->Type = MEM_IMAGE;
2122 }
2123 else
2124 {
2125 Info->AllocationBase = MemoryArea->StartingAddress;
2126 Info->Type = MEM_MAPPED;
2127 }
2128 Info->BaseAddress = RegionBaseAddress;
2129 Info->AllocationProtect = MemoryArea->Protect;
2130 Info->RegionSize = Region->Length;
2131 Info->State = MEM_COMMIT;
2132 Info->Protect = Region->Protect;
2133
2134 *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
2135 return(STATUS_SUCCESS);
2136 }
2137
2138 VOID
2139 NTAPI
2140 MmpFreePageFileSegment(PMM_SECTION_SEGMENT Segment)
2141 {
2142 ULONG Length;
2143 ULONG Offset;
2144 ULONG Entry;
2145 ULONG SavedSwapEntry;
2146 PFN_TYPE Page;
2147
2148 Page = 0;
2149
2150 Length = PAGE_ROUND_UP(Segment->Length);
2151 for (Offset = 0; Offset < Length; Offset += PAGE_SIZE)
2152 {
2153 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
2154 if (Entry)
2155 {
2156 if (IS_SWAP_FROM_SSE(Entry))
2157 {
2158 MmFreeSwapPage(SWAPENTRY_FROM_SSE(Entry));
2159 }
2160 else
2161 {
2162 Page = PFN_FROM_SSE(Entry);
2163 SavedSwapEntry = MmGetSavedSwapEntryPage(Page);
2164 if (SavedSwapEntry != 0)
2165 {
2166 MmSetSavedSwapEntryPage(Page, 0);
2167 MmFreeSwapPage(SavedSwapEntry);
2168 }
2169 MmReleasePageMemoryConsumer(MC_USER, Page);
2170 }
2171 MmSetPageEntrySectionSegment(Segment, Offset, 0);
2172 }
2173 }
2174 }
2175
2176 VOID NTAPI
2177 MmpDeleteSection(PVOID ObjectBody)
2178 {
2179 PROS_SECTION_OBJECT Section = (PROS_SECTION_OBJECT)ObjectBody;
2180
2181 DPRINT("MmpDeleteSection(ObjectBody %x)\n", ObjectBody);
2182 if (Section->AllocationAttributes & SEC_IMAGE)
2183 {
2184 ULONG i;
2185 ULONG NrSegments;
2186 ULONG RefCount;
2187 PMM_SECTION_SEGMENT SectionSegments;
2188
2189 /*
2190 * NOTE: Section->ImageSection can be NULL for short time
2191 * during the section creating. If we fail for some reason
2192 * until the image section is properly initialized we shouldn't
2193 * process further here.
2194 */
2195 if (Section->ImageSection == NULL)
2196 return;
2197
2198 SectionSegments = Section->ImageSection->Segments;
2199 NrSegments = Section->ImageSection->NrSegments;
2200
2201 for (i = 0; i < NrSegments; i++)
2202 {
2203 if (SectionSegments[i].Characteristics & IMAGE_SCN_MEM_SHARED)
2204 {
2205 MmLockSectionSegment(&SectionSegments[i]);
2206 }
2207 RefCount = InterlockedDecrementUL(&SectionSegments[i].ReferenceCount);
2208 if (SectionSegments[i].Characteristics & IMAGE_SCN_MEM_SHARED)
2209 {
2210 if (RefCount == 0)
2211 {
2212 MmpFreePageFileSegment(&SectionSegments[i]);
2213 }
2214 MmUnlockSectionSegment(&SectionSegments[i]);
2215 }
2216 }
2217 }
2218 else
2219 {
2220 /*
2221 * NOTE: Section->Segment can be NULL for short time
2222 * during the section creating.
2223 */
2224 if (Section->Segment == NULL)
2225 return;
2226
2227 if (Section->Segment->Flags & MM_PAGEFILE_SEGMENT)
2228 {
2229 MmpFreePageFileSegment(Section->Segment);
2230 MmFreePageTablesSectionSegment(Section->Segment);
2231 ExFreePool(Section->Segment);
2232 Section->Segment = NULL;
2233 }
2234 else
2235 {
2236 (void)InterlockedDecrementUL(&Section->Segment->ReferenceCount);
2237 }
2238 }
2239 if (Section->FileObject != NULL)
2240 {
2241 CcRosDereferenceCache(Section->FileObject);
2242 ObDereferenceObject(Section->FileObject);
2243 Section->FileObject = NULL;
2244 }
2245 }
2246
2247 VOID NTAPI
2248 MmpCloseSection(IN PEPROCESS Process OPTIONAL,
2249 IN PVOID Object,
2250 IN ACCESS_MASK GrantedAccess,
2251 IN ULONG ProcessHandleCount,
2252 IN ULONG SystemHandleCount)
2253 {
2254 DPRINT("MmpCloseSection(OB %x, HC %d)\n",
2255 Object, ProcessHandleCount);
2256 }
2257
2258 NTSTATUS
2259 INIT_FUNCTION
2260 NTAPI
2261 MmCreatePhysicalMemorySection(VOID)
2262 {
2263 PROS_SECTION_OBJECT PhysSection;
2264 NTSTATUS Status;
2265 OBJECT_ATTRIBUTES Obj;
2266 UNICODE_STRING Name = RTL_CONSTANT_STRING(L"\\Device\\PhysicalMemory");
2267 LARGE_INTEGER SectionSize;
2268 HANDLE Handle;
2269
2270 /*
2271 * Create the section mapping physical memory
2272 */
2273 SectionSize.QuadPart = 0xFFFFFFFF;
2274 InitializeObjectAttributes(&Obj,
2275 &Name,
2276 OBJ_PERMANENT,
2277 NULL,
2278 NULL);
2279 Status = MmCreateSection((PVOID)&PhysSection,
2280 SECTION_ALL_ACCESS,
2281 &Obj,
2282 &SectionSize,
2283 PAGE_EXECUTE_READWRITE,
2284 0,
2285 NULL,
2286 NULL);
2287 if (!NT_SUCCESS(Status))
2288 {
2289 DPRINT1("Failed to create PhysicalMemory section\n");
2290 KeBugCheck(MEMORY_MANAGEMENT);
2291 }
2292 Status = ObInsertObject(PhysSection,
2293 NULL,
2294 SECTION_ALL_ACCESS,
2295 0,
2296 NULL,
2297 &Handle);
2298 if (!NT_SUCCESS(Status))
2299 {
2300 ObDereferenceObject(PhysSection);
2301 }
2302 ObCloseHandle(Handle, KernelMode);
2303 PhysSection->AllocationAttributes |= SEC_PHYSICALMEMORY;
2304 PhysSection->Segment->Flags &= ~MM_PAGEFILE_SEGMENT;
2305
2306 return(STATUS_SUCCESS);
2307 }
2308
2309 NTSTATUS
2310 INIT_FUNCTION
2311 NTAPI
2312 MmInitSectionImplementation(VOID)
2313 {
2314 OBJECT_TYPE_INITIALIZER ObjectTypeInitializer;
2315 UNICODE_STRING Name;
2316
2317 DPRINT("Creating Section Object Type\n");
2318
2319 /* Initialize the Section object type */
2320 RtlZeroMemory(&ObjectTypeInitializer, sizeof(ObjectTypeInitializer));
2321 RtlInitUnicodeString(&Name, L"Section");
2322 ObjectTypeInitializer.Length = sizeof(ObjectTypeInitializer);
2323 ObjectTypeInitializer.DefaultPagedPoolCharge = sizeof(ROS_SECTION_OBJECT);
2324 ObjectTypeInitializer.PoolType = PagedPool;
2325 ObjectTypeInitializer.UseDefaultObject = TRUE;
2326 ObjectTypeInitializer.GenericMapping = MmpSectionMapping;
2327 ObjectTypeInitializer.DeleteProcedure = MmpDeleteSection;
2328 ObjectTypeInitializer.CloseProcedure = MmpCloseSection;
2329 ObjectTypeInitializer.ValidAccessMask = SECTION_ALL_ACCESS;
2330 ObCreateObjectType(&Name, &ObjectTypeInitializer, NULL, &MmSectionObjectType);
2331
2332 return(STATUS_SUCCESS);
2333 }
2334
2335 NTSTATUS
2336 NTAPI
2337 MmCreatePageFileSection(PROS_SECTION_OBJECT *SectionObject,
2338 ACCESS_MASK DesiredAccess,
2339 POBJECT_ATTRIBUTES ObjectAttributes,
2340 PLARGE_INTEGER UMaximumSize,
2341 ULONG SectionPageProtection,
2342 ULONG AllocationAttributes)
2343 /*
2344 * Create a section which is backed by the pagefile
2345 */
2346 {
2347 LARGE_INTEGER MaximumSize;
2348 PROS_SECTION_OBJECT Section;
2349 PMM_SECTION_SEGMENT Segment;
2350 NTSTATUS Status;
2351
2352 if (UMaximumSize == NULL)
2353 {
2354 return(STATUS_UNSUCCESSFUL);
2355 }
2356 MaximumSize = *UMaximumSize;
2357
2358 /*
2359 * Create the section
2360 */
2361 Status = ObCreateObject(ExGetPreviousMode(),
2362 MmSectionObjectType,
2363 ObjectAttributes,
2364 ExGetPreviousMode(),
2365 NULL,
2366 sizeof(ROS_SECTION_OBJECT),
2367 0,
2368 0,
2369 (PVOID*)(PVOID)&Section);
2370 if (!NT_SUCCESS(Status))
2371 {
2372 return(Status);
2373 }
2374
2375 /*
2376 * Initialize it
2377 */
2378 RtlZeroMemory(Section, sizeof(ROS_SECTION_OBJECT));
2379 Section->SectionPageProtection = SectionPageProtection;
2380 Section->AllocationAttributes = AllocationAttributes;
2381 Section->MaximumSize = MaximumSize;
2382 Segment = ExAllocatePoolWithTag(NonPagedPool, sizeof(MM_SECTION_SEGMENT),
2383 TAG_MM_SECTION_SEGMENT);
2384 if (Segment == NULL)
2385 {
2386 ObDereferenceObject(Section);
2387 return(STATUS_NO_MEMORY);
2388 }
2389 Section->Segment = Segment;
2390 Segment->ReferenceCount = 1;
2391 ExInitializeFastMutex(&Segment->Lock);
2392 Segment->FileOffset = 0;
2393 Segment->Protection = SectionPageProtection;
2394 Segment->RawLength = MaximumSize.u.LowPart;
2395 Segment->Length = PAGE_ROUND_UP(MaximumSize.u.LowPart);
2396 Segment->Flags = MM_PAGEFILE_SEGMENT;
2397 Segment->WriteCopy = FALSE;
2398 RtlZeroMemory(&Segment->PageDirectory, sizeof(SECTION_PAGE_DIRECTORY));
2399 Segment->VirtualAddress = 0;
2400 Segment->Characteristics = 0;
2401 *SectionObject = Section;
2402 return(STATUS_SUCCESS);
2403 }
2404
2405
2406 NTSTATUS
2407 NTAPI
2408 MmCreateDataFileSection(PROS_SECTION_OBJECT *SectionObject,
2409 ACCESS_MASK DesiredAccess,
2410 POBJECT_ATTRIBUTES ObjectAttributes,
2411 PLARGE_INTEGER UMaximumSize,
2412 ULONG SectionPageProtection,
2413 ULONG AllocationAttributes,
2414 HANDLE FileHandle)
2415 /*
2416 * Create a section backed by a data file
2417 */
2418 {
2419 PROS_SECTION_OBJECT Section;
2420 NTSTATUS Status;
2421 LARGE_INTEGER MaximumSize;
2422 PFILE_OBJECT FileObject;
2423 PMM_SECTION_SEGMENT Segment;
2424 ULONG FileAccess;
2425 IO_STATUS_BLOCK Iosb;
2426 LARGE_INTEGER Offset;
2427 CHAR Buffer;
2428 FILE_STANDARD_INFORMATION FileInfo;
2429
2430 /*
2431 * Create the section
2432 */
2433 Status = ObCreateObject(ExGetPreviousMode(),
2434 MmSectionObjectType,
2435 ObjectAttributes,
2436 ExGetPreviousMode(),
2437 NULL,
2438 sizeof(ROS_SECTION_OBJECT),
2439 0,
2440 0,
2441 (PVOID*)(PVOID)&Section);
2442 if (!NT_SUCCESS(Status))
2443 {
2444 return(Status);
2445 }
2446 /*
2447 * Initialize it
2448 */
2449 RtlZeroMemory(Section, sizeof(ROS_SECTION_OBJECT));
2450 Section->SectionPageProtection = SectionPageProtection;
2451 Section->AllocationAttributes = AllocationAttributes;
2452
2453 /*
2454 * Check file access required
2455 */
2456 if (SectionPageProtection & PAGE_READWRITE ||
2457 SectionPageProtection & PAGE_EXECUTE_READWRITE)
2458 {
2459 FileAccess = FILE_READ_DATA | FILE_WRITE_DATA;
2460 }
2461 else
2462 {
2463 FileAccess = FILE_READ_DATA;
2464 }
2465
2466 /*
2467 * Reference the file handle
2468 */
2469 Status = ObReferenceObjectByHandle(FileHandle,
2470 FileAccess,
2471 IoFileObjectType,
2472 ExGetPreviousMode(),
2473 (PVOID*)(PVOID)&FileObject,
2474 NULL);
2475 if (!NT_SUCCESS(Status))
2476 {
2477 ObDereferenceObject(Section);
2478 return(Status);
2479 }
2480
2481 /*
2482 * FIXME: This is propably not entirely correct. We can't look into
2483 * the standard FCB header because it might not be initialized yet
2484 * (as in case of the EXT2FS driver by Manoj Paul Joseph where the
2485 * standard file information is filled on first request).
2486 */
2487 Status = IoQueryFileInformation(FileObject,
2488 FileStandardInformation,
2489 sizeof(FILE_STANDARD_INFORMATION),
2490 &FileInfo,
2491 &Iosb.Information);
2492 if (!NT_SUCCESS(Status))
2493 {
2494 ObDereferenceObject(Section);
2495 ObDereferenceObject(FileObject);
2496 return Status;
2497 }
2498
2499 /*
2500 * FIXME: Revise this once a locking order for file size changes is
2501 * decided
2502 */
2503 if ((UMaximumSize != NULL) && (UMaximumSize->QuadPart != 0))
2504 {
2505 MaximumSize = *UMaximumSize;
2506 }
2507 else
2508 {
2509 MaximumSize = FileInfo.EndOfFile;
2510 /* Mapping zero-sized files isn't allowed. */
2511 if (MaximumSize.QuadPart == 0)
2512 {
2513 ObDereferenceObject(Section);
2514 ObDereferenceObject(FileObject);
2515 return STATUS_FILE_INVALID;
2516 }
2517 }
2518
2519 if (MaximumSize.QuadPart > FileInfo.EndOfFile.QuadPart)
2520 {
2521 Status = IoSetInformation(FileObject,
2522 FileAllocationInformation,
2523 sizeof(LARGE_INTEGER),
2524 &MaximumSize);
2525 if (!NT_SUCCESS(Status))
2526 {
2527 ObDereferenceObject(Section);
2528 ObDereferenceObject(FileObject);
2529 return(STATUS_SECTION_NOT_EXTENDED);
2530 }
2531 }
2532
2533 if (FileObject->SectionObjectPointer == NULL ||
2534 FileObject->SectionObjectPointer->SharedCacheMap == NULL)
2535 {
2536 /*
2537 * Read a bit so caching is initiated for the file object.
2538 * This is only needed because MiReadPage currently cannot
2539 * handle non-cached streams.
2540 */
2541 Offset.QuadPart = 0;
2542 Status = ZwReadFile(FileHandle,
2543 NULL,
2544 NULL,
2545 NULL,
2546 &Iosb,
2547 &Buffer,
2548 sizeof (Buffer),
2549 &Offset,
2550 0);
2551 if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE))
2552 {
2553 ObDereferenceObject(Section);
2554 ObDereferenceObject(FileObject);
2555 return(Status);
2556 }
2557 if (FileObject->SectionObjectPointer == NULL ||
2558 FileObject->SectionObjectPointer->SharedCacheMap == NULL)
2559 {
2560 /* FIXME: handle this situation */
2561 ObDereferenceObject(Section);
2562 ObDereferenceObject(FileObject);
2563 return STATUS_INVALID_PARAMETER;
2564 }
2565 }
2566
2567 /*
2568 * Lock the file
2569 */
2570 Status = MmspWaitForFileLock(FileObject);
2571 if (Status != STATUS_SUCCESS)
2572 {
2573 ObDereferenceObject(Section);
2574 ObDereferenceObject(FileObject);
2575 return(Status);
2576 }
2577
2578 /*
2579 * If this file hasn't been mapped as a data file before then allocate a
2580 * section segment to describe the data file mapping
2581 */
2582 if (FileObject->SectionObjectPointer->DataSectionObject == NULL)
2583 {
2584 Segment = ExAllocatePoolWithTag(NonPagedPool, sizeof(MM_SECTION_SEGMENT),
2585 TAG_MM_SECTION_SEGMENT);
2586 if (Segment == NULL)
2587 {
2588 //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
2589 ObDereferenceObject(Section);
2590 ObDereferenceObject(FileObject);
2591 return(STATUS_NO_MEMORY);
2592 }
2593 Section->Segment = Segment;
2594 Segment->ReferenceCount = 1;
2595 ExInitializeFastMutex(&Segment->Lock);
2596 /*
2597 * Set the lock before assigning the segment to the file object
2598 */
2599 ExAcquireFastMutex(&Segment->Lock);
2600 FileObject->SectionObjectPointer->DataSectionObject = (PVOID)Segment;
2601
2602 Segment->FileOffset = 0;
2603 Segment->Protection = SectionPageProtection;
2604 Segment->Flags = MM_DATAFILE_SEGMENT;
2605 Segment->Characteristics = 0;
2606 Segment->WriteCopy = FALSE;
2607 if (AllocationAttributes & SEC_RESERVE)
2608 {
2609 Segment->Length = Segment->RawLength = 0;
2610 }
2611 else
2612 {
2613 Segment->RawLength = MaximumSize.u.LowPart;
2614 Segment->Length = PAGE_ROUND_UP(Segment->RawLength);
2615 }
2616 Segment->VirtualAddress = 0;
2617 RtlZeroMemory(&Segment->PageDirectory, sizeof(SECTION_PAGE_DIRECTORY));
2618 }
2619 else
2620 {
2621 /*
2622 * If the file is already mapped as a data file then we may need
2623 * to extend it
2624 */
2625 Segment =
2626 (PMM_SECTION_SEGMENT)FileObject->SectionObjectPointer->
2627 DataSectionObject;
2628 Section->Segment = Segment;
2629 (void)InterlockedIncrementUL(&Segment->ReferenceCount);
2630 MmLockSectionSegment(Segment);
2631
2632 if (MaximumSize.u.LowPart > Segment->RawLength &&
2633 !(AllocationAttributes & SEC_RESERVE))
2634 {
2635 Segment->RawLength = MaximumSize.u.LowPart;
2636 Segment->Length = PAGE_ROUND_UP(Segment->RawLength);
2637 }
2638 }
2639 MmUnlockSectionSegment(Segment);
2640 Section->FileObject = FileObject;
2641 Section->MaximumSize = MaximumSize;
2642 CcRosReferenceCache(FileObject);
2643 //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
2644 *SectionObject = Section;
2645 return(STATUS_SUCCESS);
2646 }
2647
2648 /*
2649 TODO: not that great (declaring loaders statically, having to declare all of
2650 them, having to keep them extern, etc.), will fix in the future
2651 */
2652 extern NTSTATUS NTAPI PeFmtCreateSection
2653 (
2654 IN CONST VOID * FileHeader,
2655 IN SIZE_T FileHeaderSize,
2656 IN PVOID File,
2657 OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject,
2658 OUT PULONG Flags,
2659 IN PEXEFMT_CB_READ_FILE ReadFileCb,
2660 IN PEXEFMT_CB_ALLOCATE_SEGMENTS AllocateSegmentsCb
2661 );
2662
2663 extern NTSTATUS NTAPI ElfFmtCreateSection
2664 (
2665 IN CONST VOID * FileHeader,
2666 IN SIZE_T FileHeaderSize,
2667 IN PVOID File,
2668 OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject,
2669 OUT PULONG Flags,
2670 IN PEXEFMT_CB_READ_FILE ReadFileCb,
2671 IN PEXEFMT_CB_ALLOCATE_SEGMENTS AllocateSegmentsCb
2672 );
2673
2674 /* TODO: this is a standard DDK/PSDK macro */
2675 #ifndef RTL_NUMBER_OF
2676 #define RTL_NUMBER_OF(ARR_) (sizeof(ARR_) / sizeof((ARR_)[0]))
2677 #endif
2678
2679 static PEXEFMT_LOADER ExeFmtpLoaders[] =
2680 {
2681 PeFmtCreateSection,
2682 #ifdef __ELF
2683 ElfFmtCreateSection
2684 #endif
2685 };
2686
2687 static
2688 PMM_SECTION_SEGMENT
2689 NTAPI
2690 ExeFmtpAllocateSegments(IN ULONG NrSegments)
2691 {
2692 SIZE_T SizeOfSegments;
2693 PMM_SECTION_SEGMENT Segments;
2694
2695 /* TODO: check for integer overflow */
2696 SizeOfSegments = sizeof(MM_SECTION_SEGMENT) * NrSegments;
2697
2698 Segments = ExAllocatePoolWithTag(NonPagedPool,
2699 SizeOfSegments,
2700 TAG_MM_SECTION_SEGMENT);
2701
2702 if(Segments)
2703 RtlZeroMemory(Segments, SizeOfSegments);
2704
2705 return Segments;
2706 }
2707
2708 static
2709 NTSTATUS
2710 NTAPI
2711 ExeFmtpReadFile(IN PVOID File,
2712 IN PLARGE_INTEGER Offset,
2713 IN ULONG Length,
2714 OUT PVOID * Data,
2715 OUT PVOID * AllocBase,
2716 OUT PULONG ReadSize)
2717 {
2718 NTSTATUS Status;
2719 LARGE_INTEGER FileOffset;
2720 ULONG AdjustOffset;
2721 ULONG OffsetAdjustment;
2722 ULONG BufferSize;
2723 ULONG UsedSize;
2724 PVOID Buffer;
2725
2726 ASSERT_IRQL_LESS(DISPATCH_LEVEL);
2727
2728 if(Length == 0)
2729 {
2730 KeBugCheck(MEMORY_MANAGEMENT);
2731 }
2732
2733 FileOffset = *Offset;
2734
2735 /* Negative/special offset: it cannot be used in this context */
2736 if(FileOffset.u.HighPart < 0)
2737 {
2738 KeBugCheck(MEMORY_MANAGEMENT);
2739 }
2740
2741 AdjustOffset = PAGE_ROUND_DOWN(FileOffset.u.LowPart);
2742 OffsetAdjustment = FileOffset.u.LowPart - AdjustOffset;
2743 FileOffset.u.LowPart = AdjustOffset;
2744
2745 BufferSize = Length + OffsetAdjustment;
2746 BufferSize = PAGE_ROUND_UP(BufferSize);
2747
2748 /*
2749 * It's ok to use paged pool, because this is a temporary buffer only used in
2750 * the loading of executables. The assumption is that MmCreateSection is
2751 * always called at low IRQLs and that these buffers don't survive a brief
2752 * initialization phase
2753 */
2754 Buffer = ExAllocatePoolWithTag(PagedPool,
2755 BufferSize,
2756 TAG('M', 'm', 'X', 'r'));
2757
2758 UsedSize = 0;
2759
2760 #if 0
2761 Status = MmspPageRead(File,
2762 Buffer,
2763 BufferSize,
2764 &FileOffset,
2765 &UsedSize);
2766 #else
2767 /*
2768 * FIXME: if we don't use ZwReadFile, caching is not enabled for the file and
2769 * nothing will work. But using ZwReadFile is wrong, and using its side effects
2770 * to initialize internal state is even worse. Our cache manager is in need of
2771 * professional help
2772 */
2773 {
2774 IO_STATUS_BLOCK Iosb;
2775
2776 Status = ZwReadFile(File,
2777 NULL,
2778 NULL,
2779 NULL,
2780 &Iosb,
2781 Buffer,
2782 BufferSize,
2783 &FileOffset,
2784 NULL);
2785
2786 if(NT_SUCCESS(Status))
2787 {
2788 UsedSize = Iosb.Information;
2789 }
2790 }
2791 #endif
2792
2793 if(NT_SUCCESS(Status) && UsedSize < OffsetAdjustment)
2794 {
2795 Status = STATUS_IN_PAGE_ERROR;
2796 ASSERT(!NT_SUCCESS(Status));
2797 }
2798
2799 if(NT_SUCCESS(Status))
2800 {
2801 *Data = (PVOID)((ULONG_PTR)Buffer + OffsetAdjustment);
2802 *AllocBase = Buffer;
2803 *ReadSize = UsedSize - OffsetAdjustment;
2804 }
2805 else
2806 {
2807 ExFreePoolWithTag(Buffer, TAG('M', 'm', 'X', 'r'));
2808 }
2809
2810 return Status;
2811 }
2812
2813 #ifdef NASSERT
2814 # define MmspAssertSegmentsSorted(OBJ_) ((void)0)
2815 # define MmspAssertSegmentsNoOverlap(OBJ_) ((void)0)
2816 # define MmspAssertSegmentsPageAligned(OBJ_) ((void)0)
2817 #else
2818 static
2819 VOID
2820 NTAPI
2821 MmspAssertSegmentsSorted(IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
2822 {
2823 ULONG i;
2824
2825 for( i = 1; i < ImageSectionObject->NrSegments; ++ i )
2826 {
2827 ASSERT(ImageSectionObject->Segments[i].VirtualAddress >=
2828 ImageSectionObject->Segments[i - 1].VirtualAddress);
2829 }
2830 }
2831
2832 static
2833 VOID
2834 NTAPI
2835 MmspAssertSegmentsNoOverlap(IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
2836 {
2837 ULONG i;
2838
2839 MmspAssertSegmentsSorted(ImageSectionObject);
2840
2841 for( i = 0; i < ImageSectionObject->NrSegments; ++ i )
2842 {
2843 ASSERT(ImageSectionObject->Segments[i].Length > 0);
2844
2845 if(i > 0)
2846 {
2847 ASSERT(ImageSectionObject->Segments[i].VirtualAddress >=
2848 (ImageSectionObject->Segments[i - 1].VirtualAddress +
2849 ImageSectionObject->Segments[i - 1].Length));
2850 }
2851 }
2852 }
2853
2854 static
2855 VOID
2856 NTAPI
2857 MmspAssertSegmentsPageAligned(IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
2858 {
2859 ULONG i;
2860
2861 for( i = 0; i < ImageSectionObject->NrSegments; ++ i )
2862 {
2863 ASSERT((ImageSectionObject->Segments[i].VirtualAddress % PAGE_SIZE) == 0);
2864 ASSERT((ImageSectionObject->Segments[i].Length % PAGE_SIZE) == 0);
2865 }
2866 }
2867 #endif
2868
2869 static
2870 int
2871 __cdecl
2872 MmspCompareSegments(const void * x,
2873 const void * y)
2874 {
2875 const MM_SECTION_SEGMENT *Segment1 = (const MM_SECTION_SEGMENT *)x;
2876 const MM_SECTION_SEGMENT *Segment2 = (const MM_SECTION_SEGMENT *)y;
2877
2878 return
2879 (Segment1->VirtualAddress - Segment2->VirtualAddress) >>
2880 ((sizeof(ULONG_PTR) - sizeof(int)) * 8);
2881 }
2882
2883 /*
2884 * Ensures an image section's segments are sorted in memory
2885 */
2886 static
2887 VOID
2888 NTAPI
2889 MmspSortSegments(IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject,
2890 IN ULONG Flags)
2891 {
2892 if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_SORTED)
2893 {
2894 MmspAssertSegmentsSorted(ImageSectionObject);
2895 }
2896 else
2897 {
2898 qsort(ImageSectionObject->Segments,
2899 ImageSectionObject->NrSegments,
2900 sizeof(ImageSectionObject->Segments[0]),
2901 MmspCompareSegments);
2902 }
2903 }
2904
2905
2906 /*
2907 * Ensures an image section's segments don't overlap in memory and don't have
2908 * gaps and don't have a null size. We let them map to overlapping file regions,
2909 * though - that's not necessarily an error
2910 */
2911 static
2912 BOOLEAN
2913 NTAPI
2914 MmspCheckSegmentBounds
2915 (
2916 IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject,
2917 IN ULONG Flags
2918 )
2919 {
2920 ULONG i;
2921
2922 if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_NO_OVERLAP)
2923 {
2924 MmspAssertSegmentsNoOverlap(ImageSectionObject);
2925 return TRUE;
2926 }
2927
2928 ASSERT(ImageSectionObject->NrSegments >= 1);
2929
2930 for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
2931 {
2932 if(ImageSectionObject->Segments[i].Length == 0)
2933 {
2934 return FALSE;
2935 }
2936
2937 if(i > 0)
2938 {
2939 /*
2940 * TODO: relax the limitation on gaps. For example, gaps smaller than a
2941 * page could be OK (Windows seems to be OK with them), and larger gaps
2942 * could lead to image sections spanning several discontiguous regions
2943 * (NtMapViewOfSection could then refuse to map them, and they could
2944 * e.g. only be allowed as parameters to NtCreateProcess, like on UNIX)
2945 */
2946 if ((ImageSectionObject->Segments[i - 1].VirtualAddress +
2947 ImageSectionObject->Segments[i - 1].Length) !=
2948 ImageSectionObject->Segments[i].VirtualAddress)
2949 {
2950 return FALSE;
2951 }
2952 }
2953 }
2954
2955 return TRUE;
2956 }
2957
2958 /*
2959 * Merges and pads an image section's segments until they all are page-aligned
2960 * and have a size that is a multiple of the page size
2961 */
2962 static
2963 BOOLEAN
2964 NTAPI
2965 MmspPageAlignSegments
2966 (
2967 IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject,
2968 IN ULONG Flags
2969 )
2970 {
2971 ULONG i;
2972 ULONG LastSegment;
2973 BOOLEAN Initialized;
2974 PMM_SECTION_SEGMENT EffectiveSegment;
2975
2976 if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_PAGE_ALIGNED)
2977 {
2978 MmspAssertSegmentsPageAligned(ImageSectionObject);
2979 return TRUE;
2980 }
2981
2982 Initialized = FALSE;
2983 LastSegment = 0;
2984 EffectiveSegment = &ImageSectionObject->Segments[LastSegment];
2985
2986 for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
2987 {
2988 /*
2989 * The first segment requires special handling
2990 */
2991 if (i == 0)
2992 {
2993 ULONG_PTR VirtualAddress;
2994 ULONG_PTR VirtualOffset;
2995
2996 VirtualAddress = EffectiveSegment->VirtualAddress;
2997
2998 /* Round down the virtual address to the nearest page */
2999 EffectiveSegment->VirtualAddress = PAGE_ROUND_DOWN(VirtualAddress);
3000
3001 /* Round up the virtual size to the nearest page */
3002 EffectiveSegment->Length = PAGE_ROUND_UP(VirtualAddress + EffectiveSegment->Length) -
3003 EffectiveSegment->VirtualAddress;
3004
3005 /* Adjust the raw address and size */
3006 VirtualOffset = VirtualAddress - EffectiveSegment->VirtualAddress;
3007
3008 if (EffectiveSegment->FileOffset < VirtualOffset)
3009 {
3010 return FALSE;
3011 }
3012
3013 /*
3014 * Garbage in, garbage out: unaligned base addresses make the file
3015 * offset point in curious and odd places, but that's what we were
3016 * asked for
3017 */
3018 EffectiveSegment->FileOffset -= VirtualOffset;
3019 EffectiveSegment->RawLength += VirtualOffset;
3020 }
3021 else
3022 {
3023 PMM_SECTION_SEGMENT Segment = &ImageSectionObject->Segments[i];
3024 ULONG_PTR EndOfEffectiveSegment;
3025
3026 EndOfEffectiveSegment = EffectiveSegment->VirtualAddress + EffectiveSegment->Length;
3027 ASSERT((EndOfEffectiveSegment % PAGE_SIZE) == 0);
3028
3029 /*
3030 * The current segment begins exactly where the current effective
3031 * segment ended, therefore beginning a new effective segment
3032 */
3033 if (EndOfEffectiveSegment == Segment->VirtualAddress)
3034 {
3035 LastSegment ++;
3036 ASSERT(LastSegment <= i);
3037 ASSERT(LastSegment < ImageSectionObject->NrSegments);
3038
3039 EffectiveSegment = &ImageSectionObject->Segments[LastSegment];
3040
3041 if (LastSegment != i)
3042 {
3043 /*
3044 * Copy the current segment. If necessary, the effective segment
3045 * will be expanded later
3046 */
3047 *EffectiveSegment = *Segment;
3048 }
3049
3050 /*
3051 * Page-align the virtual size. We know for sure the virtual address
3052 * already is
3053 */
3054 ASSERT((EffectiveSegment->VirtualAddress % PAGE_SIZE) == 0);
3055 EffectiveSegment->Length = PAGE_ROUND_UP(EffectiveSegment->Length);
3056 }
3057 /*
3058 * The current segment is still part of the current effective segment:
3059 * extend the effective segment to reflect this
3060 */
3061 else if (EndOfEffectiveSegment > Segment->VirtualAddress)
3062 {
3063 static const ULONG FlagsToProtection[16] =
3064 {
3065 PAGE_NOACCESS,
3066 PAGE_READONLY,
3067 PAGE_READWRITE,
3068 PAGE_READWRITE,
3069 PAGE_EXECUTE_READ,
3070 PAGE_EXECUTE_READ,
3071 PAGE_EXECUTE_READWRITE,
3072 PAGE_EXECUTE_READWRITE,
3073 PAGE_WRITECOPY,
3074 PAGE_WRITECOPY,
3075 PAGE_WRITECOPY,
3076 PAGE_WRITECOPY,
3077 PAGE_EXECUTE_WRITECOPY,
3078 PAGE_EXECUTE_WRITECOPY,
3079 PAGE_EXECUTE_WRITECOPY,
3080 PAGE_EXECUTE_WRITECOPY
3081 };
3082
3083 unsigned ProtectionFlags;
3084
3085 /*
3086 * Extend the file size
3087 */
3088
3089 /* Unaligned segments must be contiguous within the file */
3090 if (Segment->FileOffset != (EffectiveSegment->FileOffset +
3091 EffectiveSegment->RawLength))
3092 {
3093 return FALSE;
3094 }
3095
3096 EffectiveSegment->RawLength += Segment->RawLength;
3097
3098 /*
3099 * Extend the virtual size
3100 */
3101 ASSERT(PAGE_ROUND_UP(Segment->VirtualAddress + Segment->Length) >= EndOfEffectiveSegment);
3102
3103 EffectiveSegment->Length = PAGE_ROUND_UP(Segment->VirtualAddress + Segment->Length) -
3104 EffectiveSegment->VirtualAddress;
3105
3106 /*
3107 * Merge the protection
3108 */
3109 EffectiveSegment->Protection |= Segment->Protection;
3110
3111 /* Clean up redundance */
3112 ProtectionFlags = 0;
3113
3114 if(EffectiveSegment->Protection & PAGE_IS_READABLE)
3115 ProtectionFlags |= 1 << 0;
3116
3117 if(EffectiveSegment->Protection & PAGE_IS_WRITABLE)
3118 ProtectionFlags |= 1 << 1;
3119
3120 if(EffectiveSegment->Protection & PAGE_IS_EXECUTABLE)
3121 ProtectionFlags |= 1 << 2;
3122
3123 if(EffectiveSegment->Protection & PAGE_IS_WRITECOPY)
3124 ProtectionFlags |= 1 << 3;
3125
3126 ASSERT(ProtectionFlags < 16);
3127 EffectiveSegment->Protection = FlagsToProtection[ProtectionFlags];
3128
3129 /* If a segment was required to be shared and cannot, fail */
3130 if(!(Segment->Protection & PAGE_IS_WRITECOPY) &&
3131 EffectiveSegment->Protection & PAGE_IS_WRITECOPY)
3132 {
3133 return FALSE;
3134 }
3135 }
3136 /*
3137 * We assume no holes between segments at this point
3138 */
3139 else
3140 {
3141 KeBugCheck(MEMORY_MANAGEMENT);
3142 }
3143 }
3144 }
3145 ImageSectionObject->NrSegments = LastSegment + 1;
3146
3147 return TRUE;
3148 }
3149
3150 NTSTATUS
3151 ExeFmtpCreateImageSection(HANDLE FileHandle,
3152 PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
3153 {
3154 LARGE_INTEGER Offset;
3155 PVOID FileHeader;
3156 PVOID FileHeaderBuffer;
3157 ULONG FileHeaderSize;
3158 ULONG Flags;
3159 ULONG OldNrSegments;
3160 NTSTATUS Status;
3161 ULONG i;
3162
3163 /*
3164 * Read the beginning of the file (2 pages). Should be enough to contain
3165 * all (or most) of the headers
3166 */
3167 Offset.QuadPart = 0;
3168
3169 /* FIXME: use FileObject instead of FileHandle */
3170 Status = ExeFmtpReadFile (FileHandle,
3171 &Offset,
3172 PAGE_SIZE * 2,
3173 &FileHeader,
3174 &FileHeaderBuffer,
3175 &FileHeaderSize);
3176
3177 if (!NT_SUCCESS(Status))
3178 return Status;
3179
3180 if (FileHeaderSize == 0)
3181 {
3182 ExFreePool(FileHeaderBuffer);
3183 return STATUS_UNSUCCESSFUL;
3184 }
3185
3186 /*
3187 * Look for a loader that can handle this executable
3188 */
3189 for (i = 0; i < RTL_NUMBER_OF(ExeFmtpLoaders); ++ i)
3190 {
3191 RtlZeroMemory(ImageSectionObject, sizeof(*ImageSectionObject));
3192 Flags = 0;
3193
3194 /* FIXME: use FileObject instead of FileHandle */
3195 Status = ExeFmtpLoaders[i](FileHeader,
3196 FileHeaderSize,
3197 FileHandle,
3198 ImageSectionObject,
3199 &Flags,
3200 ExeFmtpReadFile,
3201 ExeFmtpAllocateSegments);
3202
3203 if (!NT_SUCCESS(Status))
3204 {
3205 if (ImageSectionObject->Segments)
3206 {
3207 ExFreePool(ImageSectionObject->Segments);
3208 ImageSectionObject->Segments = NULL;
3209 }
3210 }
3211
3212 if (Status != STATUS_ROS_EXEFMT_UNKNOWN_FORMAT)
3213 break;
3214 }
3215
3216 ExFreePoolWithTag(FileHeaderBuffer, TAG('M', 'm', 'X', 'r'));
3217
3218 /*
3219 * No loader handled the format
3220 */
3221 if (Status == STATUS_ROS_EXEFMT_UNKNOWN_FORMAT)
3222 {
3223 Status = STATUS_INVALID_IMAGE_NOT_MZ;
3224 ASSERT(!NT_SUCCESS(Status));
3225 }
3226
3227 if (!NT_SUCCESS(Status))
3228 return Status;
3229
3230 ASSERT(ImageSectionObject->Segments != NULL);
3231
3232 /*
3233 * Some defaults
3234 */
3235 /* FIXME? are these values platform-dependent? */
3236 if(ImageSectionObject->StackReserve == 0)
3237 ImageSectionObject->StackReserve = 0x40000;
3238
3239 if(ImageSectionObject->StackCommit == 0)
3240 ImageSectionObject->StackCommit = 0x1000;
3241
3242 if(ImageSectionObject->ImageBase == 0)
3243 {
3244 if(ImageSectionObject->ImageCharacteristics & IMAGE_FILE_DLL)
3245 ImageSectionObject->ImageBase = 0x10000000;
3246 else
3247 ImageSectionObject->ImageBase = 0x00400000;
3248 }
3249
3250 /*
3251 * And now the fun part: fixing the segments
3252 */
3253
3254 /* Sort them by virtual address */
3255 MmspSortSegments(ImageSectionObject, Flags);
3256
3257 /* Ensure they don't overlap in memory */
3258 if (!MmspCheckSegmentBounds(ImageSectionObject, Flags))
3259 return STATUS_INVALID_IMAGE_FORMAT;
3260
3261 /* Ensure they are aligned */
3262 OldNrSegments = ImageSectionObject->NrSegments;
3263
3264 if (!MmspPageAlignSegments(ImageSectionObject, Flags))
3265 return STATUS_INVALID_IMAGE_FORMAT;
3266
3267 /* Trim them if the alignment phase merged some of them */
3268 if (ImageSectionObject->NrSegments < OldNrSegments)
3269 {
3270 PMM_SECTION_SEGMENT Segments;
3271 SIZE_T SizeOfSegments;
3272
3273 SizeOfSegments = sizeof(MM_SECTION_SEGMENT) * ImageSectionObject->NrSegments;
3274
3275 Segments = ExAllocatePoolWithTag(PagedPool,
3276 SizeOfSegments,
3277 TAG_MM_SECTION_SEGMENT);
3278
3279 if (Segments == NULL)
3280 return STATUS_INSUFFICIENT_RESOURCES;
3281
3282 RtlCopyMemory(Segments, ImageSectionObject->Segments, SizeOfSegments);
3283 ExFreePool(ImageSectionObject->Segments);
3284 ImageSectionObject->Segments = Segments;
3285 }
3286
3287 /* And finish their initialization */
3288 for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
3289 {
3290 ExInitializeFastMutex(&ImageSectionObject->Segments[i].Lock);
3291 ImageSectionObject->Segments[i].ReferenceCount = 1;
3292
3293 RtlZeroMemory(&ImageSectionObject->Segments[i].PageDirectory,
3294 sizeof(ImageSectionObject->Segments[i].PageDirectory));
3295 }
3296
3297 ASSERT(NT_SUCCESS(Status));
3298 return Status;
3299 }
3300
3301 NTSTATUS
3302 MmCreateImageSection(PROS_SECTION_OBJECT *SectionObject,
3303 ACCESS_MASK DesiredAccess,
3304 POBJECT_ATTRIBUTES ObjectAttributes,
3305 PLARGE_INTEGER UMaximumSize,
3306 ULONG SectionPageProtection,
3307 ULONG AllocationAttributes,
3308 HANDLE FileHandle)
3309 {
3310 PROS_SECTION_OBJECT Section;
3311 NTSTATUS Status;
3312 PFILE_OBJECT FileObject;
3313 PMM_SECTION_SEGMENT SectionSegments;
3314 PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
3315 ULONG i;
3316 ULONG FileAccess = 0;
3317
3318 /*
3319 * Specifying a maximum size is meaningless for an image section
3320 */
3321 if (UMaximumSize != NULL)
3322 {
3323 return(STATUS_INVALID_PARAMETER_4);
3324 }
3325
3326 /*
3327 * Check file access required
3328 */
3329 if (SectionPageProtection & PAGE_READWRITE ||
3330 SectionPageProtection & PAGE_EXECUTE_READWRITE)
3331 {
3332 FileAccess = FILE_READ_DATA | FILE_WRITE_DATA;
3333 }
3334 else
3335 {
3336 FileAccess = FILE_READ_DATA;
3337 }
3338
3339 /*
3340 * Reference the file handle
3341 */
3342 Status = ObReferenceObjectByHandle(FileHandle,
3343 FileAccess,
3344 IoFileObjectType,
3345 ExGetPreviousMode(),
3346 (PVOID*)(PVOID)&FileObject,
3347 NULL);
3348
3349 if (!NT_SUCCESS(Status))
3350 {
3351 return Status;
3352 }
3353
3354 /*
3355 * Create the section
3356 */
3357 Status = ObCreateObject (ExGetPreviousMode(),
3358 MmSectionObjectType,
3359 ObjectAttributes,
3360 ExGetPreviousMode(),
3361 NULL,
3362 sizeof(ROS_SECTION_OBJECT),
3363 0,
3364 0,
3365 (PVOID*)(PVOID)&Section);
3366 if (!NT_SUCCESS(Status))
3367 {
3368 ObDereferenceObject(FileObject);
3369 return(Status);
3370 }
3371
3372 /*
3373 * Initialize it
3374 */
3375 RtlZeroMemory(Section, sizeof(ROS_SECTION_OBJECT));
3376 Section->SectionPageProtection = SectionPageProtection;
3377 Section->AllocationAttributes = AllocationAttributes;
3378
3379 /*
3380 * Initialized caching for this file object if previously caching
3381 * was initialized for the same on disk file
3382 */
3383 Status = CcTryToInitializeFileCache(FileObject);
3384
3385 if (!NT_SUCCESS(Status) || FileObject->SectionObjectPointer->ImageSectionObject == NULL)
3386 {
3387 NTSTATUS StatusExeFmt;
3388
3389 ImageSectionObject = ExAllocatePoolWithTag(PagedPool, sizeof(MM_IMAGE_SECTION_OBJECT), TAG_MM_SECTION_SEGMENT);
3390 if (ImageSectionObject == NULL)
3391 {
3392 ObDereferenceObject(FileObject);
3393 ObDereferenceObject(Section);
3394 return(STATUS_NO_MEMORY);
3395 }
3396
3397 RtlZeroMemory(ImageSectionObject, sizeof(MM_IMAGE_SECTION_OBJECT));
3398
3399 StatusExeFmt = ExeFmtpCreateImageSection(FileHandle, ImageSectionObject);
3400
3401 if (!NT_SUCCESS(StatusExeFmt))
3402 {
3403 if(ImageSectionObject->Segments != NULL)
3404 ExFreePool(ImageSectionObject->Segments);
3405
3406 ExFreePool(ImageSectionObject);
3407 ObDereferenceObject(Section);
3408 ObDereferenceObject(FileObject);
3409 return(StatusExeFmt);
3410 }
3411
3412 Section->ImageSection = ImageSectionObject;
3413 ASSERT(ImageSectionObject->Segments);
3414
3415 /*
3416 * Lock the file
3417 */
3418 Status = MmspWaitForFileLock(FileObject);
3419 if (!NT_SUCCESS(Status))
3420 {
3421 ExFreePool(ImageSectionObject->Segments);
3422 ExFreePool(ImageSectionObject);
3423 ObDereferenceObject(Section);
3424 ObDereferenceObject(FileObject);
3425 return(Status);
3426 }
3427
3428 if (NULL != InterlockedCompareExchangePointer(&FileObject->SectionObjectPointer->ImageSectionObject,
3429 ImageSectionObject, NULL))
3430 {
3431 /*
3432 * An other thread has initialized the same image in the background
3433 */
3434 ExFreePool(ImageSectionObject->Segments);
3435 ExFreePool(ImageSectionObject);
3436 ImageSectionObject = FileObject->SectionObjectPointer->ImageSectionObject;
3437 Section->ImageSection = ImageSectionObject;
3438 SectionSegments = ImageSectionObject->Segments;
3439
3440 for (i = 0; i < ImageSectionObject->NrSegments; i++)
3441 {
3442 (void)InterlockedIncrementUL(&SectionSegments[i].ReferenceCount);
3443 }
3444 }
3445
3446 Status = StatusExeFmt;
3447 }
3448 else
3449 {
3450 /*
3451 * Lock the file
3452 */
3453 Status = MmspWaitForFileLock(FileObject);
3454 if (Status != STATUS_SUCCESS)
3455 {
3456 ObDereferenceObject(Section);
3457 ObDereferenceObject(FileObject);
3458 return(Status);
3459 }
3460
3461 ImageSectionObject = FileObject->SectionObjectPointer->ImageSectionObject;
3462 Section->ImageSection = ImageSectionObject;
3463 SectionSegments = ImageSectionObject->Segments;
3464
3465 /*
3466 * Otherwise just reference all the section segments
3467 */
3468 for (i = 0; i < ImageSectionObject->NrSegments; i++)
3469 {
3470 (void)InterlockedIncrementUL(&SectionSegments[i].ReferenceCount);
3471 }
3472
3473 Status = STATUS_SUCCESS;
3474 }
3475 Section->FileObject = FileObject;
3476 CcRosReferenceCache(FileObject);
3477 //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
3478 *SectionObject = Section;
3479 return(Status);
3480 }
3481
3482 /*
3483 * @implemented
3484 */
3485 NTSTATUS NTAPI
3486 NtCreateSection (OUT PHANDLE SectionHandle,
3487 IN ACCESS_MASK DesiredAccess,
3488 IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
3489 IN PLARGE_INTEGER MaximumSize OPTIONAL,
3490 IN ULONG SectionPageProtection OPTIONAL,
3491 IN ULONG AllocationAttributes,
3492 IN HANDLE FileHandle OPTIONAL)
3493 {
3494 LARGE_INTEGER SafeMaximumSize;
3495 PVOID SectionObject;
3496 KPROCESSOR_MODE PreviousMode;
3497 NTSTATUS Status = STATUS_SUCCESS;
3498
3499 PreviousMode = ExGetPreviousMode();
3500
3501 if(PreviousMode != KernelMode)
3502 {
3503 _SEH2_TRY
3504 {
3505 if (MaximumSize != NULL)
3506 {
3507 /* make a copy on the stack */
3508 SafeMaximumSize = ProbeForReadLargeInteger(MaximumSize);
3509 MaximumSize = &SafeMaximumSize;
3510 }
3511 ProbeForWriteHandle(SectionHandle);
3512 }
3513 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3514 {
3515 Status = _SEH2_GetExceptionCode();
3516 }
3517 _SEH2_END;
3518
3519 if(!NT_SUCCESS(Status))
3520 {
3521 return Status;
3522 }
3523 }
3524
3525 Status = MmCreateSection(&SectionObject,
3526 DesiredAccess,
3527 ObjectAttributes,
3528 MaximumSize,
3529 SectionPageProtection,
3530 AllocationAttributes,
3531 FileHandle,
3532 NULL);
3533 if (NT_SUCCESS(Status))
3534 {
3535 Status = ObInsertObject ((PVOID)SectionObject,
3536 NULL,
3537 DesiredAccess,
3538 0,
3539 NULL,
3540 SectionHandle);
3541 }
3542
3543 return Status;
3544 }
3545
3546
3547 /**********************************************************************
3548 * NAME
3549 * NtOpenSection
3550 *
3551 * DESCRIPTION
3552 *
3553 * ARGUMENTS
3554 * SectionHandle
3555 *
3556 * DesiredAccess
3557 *
3558 * ObjectAttributes
3559 *
3560 * RETURN VALUE
3561 *
3562 * REVISIONS
3563 */
3564 NTSTATUS NTAPI
3565 NtOpenSection(PHANDLE SectionHandle,
3566 ACCESS_MASK DesiredAccess,
3567 POBJECT_ATTRIBUTES ObjectAttributes)
3568 {
3569 HANDLE hSection;
3570 KPROCESSOR_MODE PreviousMode;
3571 NTSTATUS Status = STATUS_SUCCESS;
3572
3573 PreviousMode = ExGetPreviousMode();
3574
3575 if(PreviousMode != KernelMode)
3576 {
3577 _SEH2_TRY
3578 {
3579 ProbeForWriteHandle(SectionHandle);
3580 }
3581 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3582 {
3583 Status = _SEH2_GetExceptionCode();
3584 }
3585 _SEH2_END;
3586
3587 if(!NT_SUCCESS(Status))
3588 {
3589 return Status;
3590 }
3591 }
3592
3593 Status = ObOpenObjectByName(ObjectAttributes,
3594 MmSectionObjectType,
3595 PreviousMode,
3596 NULL,
3597 DesiredAccess,
3598 NULL,
3599 &hSection);
3600
3601 if(NT_SUCCESS(Status))
3602 {
3603 _SEH2_TRY
3604 {
3605 *SectionHandle = hSection;
3606 }
3607 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3608 {
3609 Status = _SEH2_GetExceptionCode();
3610 }
3611 _SEH2_END;
3612 }
3613
3614 return(Status);
3615 }
3616
3617 static NTSTATUS
3618 MmMapViewOfSegment(PMMSUPPORT AddressSpace,
3619 PROS_SECTION_OBJECT Section,
3620 PMM_SECTION_SEGMENT Segment,
3621 PVOID* BaseAddress,
3622 SIZE_T ViewSize,
3623 ULONG Protect,
3624 ULONG ViewOffset,
3625 ULONG AllocationType)
3626 {
3627 PMEMORY_AREA MArea;
3628 NTSTATUS Status;
3629 PHYSICAL_ADDRESS BoundaryAddressMultiple;
3630
3631 BoundaryAddressMultiple.QuadPart = 0;
3632
3633 Status = MmCreateMemoryArea(AddressSpace,
3634 MEMORY_AREA_SECTION_VIEW,
3635 BaseAddress,
3636 ViewSize,
3637 Protect,
3638 &MArea,
3639 FALSE,
3640 AllocationType,
3641 BoundaryAddressMultiple);
3642 if (!NT_SUCCESS(Status))
3643 {
3644 DPRINT1("Mapping between 0x%.8X and 0x%.8X failed (%X).\n",
3645 (*BaseAddress), (char*)(*BaseAddress) + ViewSize, Status);
3646 return(Status);
3647 }
3648
3649 ObReferenceObject((PVOID)Section);
3650
3651 MArea->Data.SectionData.Segment = Segment;
3652 MArea->Data.SectionData.Section = Section;
3653 MArea->Data.SectionData.ViewOffset = ViewOffset;
3654 MArea->Data.SectionData.WriteCopyView = FALSE;
3655 MmInitializeRegion(&MArea->Data.SectionData.RegionListHead,
3656 ViewSize, 0, Protect);
3657
3658 return(STATUS_SUCCESS);
3659 }
3660
3661
3662 /**********************************************************************
3663 * NAME EXPORTED
3664 * NtMapViewOfSection
3665 *
3666 * DESCRIPTION
3667 * Maps a view of a section into the virtual address space of a
3668 * process.
3669 *
3670 * ARGUMENTS
3671 * SectionHandle
3672 * Handle of the section.
3673 *
3674 * ProcessHandle
3675 * Handle of the process.
3676 *
3677 * BaseAddress
3678 * Desired base address (or NULL) on entry;
3679 * Actual base address of the view on exit.
3680 *
3681 * ZeroBits
3682 * Number of high order address bits that must be zero.
3683 *
3684 * CommitSize
3685 * Size in bytes of the initially committed section of
3686 * the view.
3687 *
3688 * SectionOffset
3689 * Offset in bytes from the beginning of the section
3690 * to the beginning of the view.
3691 *
3692 * ViewSize
3693 * Desired length of map (or zero to map all) on entry
3694 * Actual length mapped on exit.
3695 *
3696 * InheritDisposition
3697 * Specified how the view is to be shared with
3698 * child processes.
3699 *
3700 * AllocateType
3701 * Type of allocation for the pages.
3702 *
3703 * Protect
3704 * Protection for the committed region of the view.
3705 *
3706 * RETURN VALUE
3707 * Status.
3708 *
3709 * @implemented
3710 */
3711 NTSTATUS NTAPI
3712 NtMapViewOfSection(IN HANDLE SectionHandle,
3713 IN HANDLE ProcessHandle,
3714 IN OUT PVOID* BaseAddress OPTIONAL,
3715 IN ULONG_PTR ZeroBits OPTIONAL,
3716 IN SIZE_T CommitSize,
3717 IN OUT PLARGE_INTEGER SectionOffset OPTIONAL,
3718 IN OUT PSIZE_T ViewSize,
3719 IN SECTION_INHERIT InheritDisposition,
3720 IN ULONG AllocationType OPTIONAL,
3721 IN ULONG Protect)
3722 {
3723 PVOID SafeBaseAddress;
3724 LARGE_INTEGER SafeSectionOffset;
3725 SIZE_T SafeViewSize;
3726 PROS_SECTION_OBJECT Section;
3727 PEPROCESS Process;
3728 KPROCESSOR_MODE PreviousMode;
3729 PMMSUPPORT AddressSpace;
3730 NTSTATUS Status = STATUS_SUCCESS;
3731 ULONG tmpProtect;
3732 ACCESS_MASK DesiredAccess;
3733
3734 /*
3735 * Check the protection
3736 */
3737 if (Protect & ~PAGE_FLAGS_VALID_FROM_USER_MODE)
3738 {
3739 return STATUS_INVALID_PARAMETER_10;
3740 }
3741
3742 tmpProtect = Protect & ~(PAGE_GUARD|PAGE_NOCACHE);
3743 if (tmpProtect != PAGE_NOACCESS &&
3744 tmpProtect != PAGE_READONLY &&
3745 tmpProtect != PAGE_READWRITE &&
3746 tmpProtect != PAGE_WRITECOPY &&
3747 tmpProtect != PAGE_EXECUTE &&
3748 tmpProtect != PAGE_EXECUTE_READ &&
3749 tmpProtect != PAGE_EXECUTE_READWRITE &&
3750 tmpProtect != PAGE_EXECUTE_WRITECOPY)
3751 {
3752 return STATUS_INVALID_PAGE_PROTECTION;
3753 }
3754
3755 PreviousMode = ExGetPreviousMode();
3756
3757 if(PreviousMode != KernelMode)
3758 {
3759 SafeBaseAddress = NULL;
3760 SafeSectionOffset.QuadPart = 0;
3761 SafeViewSize = 0;
3762
3763 _SEH2_TRY
3764 {
3765 if(BaseAddress != NULL)
3766 {
3767 ProbeForWritePointer(BaseAddress);
3768 SafeBaseAddress = *BaseAddress;
3769 }
3770 if(SectionOffset != NULL)
3771 {
3772 ProbeForWriteLargeInteger(SectionOffset);
3773 SafeSectionOffset = *SectionOffset;
3774 }
3775 ProbeForWriteSize_t(ViewSize);
3776 SafeViewSize = *ViewSize;
3777 }
3778 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3779 {
3780 Status = _SEH2_GetExceptionCode();
3781 }
3782 _SEH2_END;
3783
3784 if(!NT_SUCCESS(Status))
3785 {
3786 return Status;
3787 }
3788 }
3789 else
3790 {
3791 SafeBaseAddress = (BaseAddress != NULL ? *BaseAddress : NULL);
3792 SafeSectionOffset.QuadPart = (SectionOffset != NULL ? SectionOffset->QuadPart : 0);
3793 SafeViewSize = (ViewSize != NULL ? *ViewSize : 0);
3794 }
3795
3796 SafeSectionOffset.LowPart = PAGE_ROUND_DOWN(SafeSectionOffset.LowPart);
3797
3798 Status = ObReferenceObjectByHandle(ProcessHandle,
3799 PROCESS_VM_OPERATION,
3800 PsProcessType,
3801 PreviousMode,
3802 (PVOID*)(PVOID)&Process,
3803 NULL);
3804 if (!NT_SUCCESS(Status))
3805 {
3806 return(Status);
3807 }
3808
3809 AddressSpace = &Process->Vm;
3810
3811 /* Convert NT Protection Attr to Access Mask */
3812 if (Protect == PAGE_READONLY)
3813 {
3814 DesiredAccess = SECTION_MAP_READ;
3815 }
3816 else if (Protect == PAGE_READWRITE)
3817 {
3818 DesiredAccess = SECTION_MAP_WRITE;
3819 }
3820 else if (Protect == PAGE_WRITECOPY)
3821 {
3822 DesiredAccess = SECTION_QUERY;
3823 }
3824 /* FIXME: Handle other Protection Attributes. For now keep previous behavior */
3825 else
3826 {
3827 DesiredAccess = SECTION_MAP_READ;
3828 }
3829
3830 Status = ObReferenceObjectByHandle(SectionHandle,
3831 DesiredAccess,
3832 MmSectionObjectType,
3833 PreviousMode,
3834 (PVOID*)(PVOID)&Section,
3835 NULL);
3836 if (!(NT_SUCCESS(Status)))
3837 {
3838 DPRINT("ObReference failed rc=%x\n",Status);
3839 ObDereferenceObject(Process);
3840 return(Status);
3841 }
3842
3843 Status = MmMapViewOfSection(Section,
3844 (PEPROCESS)Process,
3845 (BaseAddress != NULL ? &SafeBaseAddress : NULL),
3846 ZeroBits,
3847 CommitSize,
3848 (SectionOffset != NULL ? &SafeSectionOffset : NULL),
3849 (ViewSize != NULL ? &SafeViewSize : NULL),
3850 InheritDisposition,
3851 AllocationType,
3852 Protect);
3853
3854 /* Check if this is an image for the current process */
3855 if ((Section->AllocationAttributes & SEC_IMAGE) &&
3856 (Process == PsGetCurrentProcess()) &&
3857 (Status != STATUS_IMAGE_NOT_AT_BASE))
3858 {
3859 /* Notify the debugger */
3860 DbgkMapViewOfSection(Section,
3861 SafeBaseAddress,
3862 SafeSectionOffset.LowPart,
3863 SafeViewSize);
3864 }
3865
3866 ObDereferenceObject(Section);
3867 ObDereferenceObject(Process);
3868
3869 if(NT_SUCCESS(Status))
3870 {
3871 /* copy parameters back to the caller */
3872 _SEH2_TRY
3873 {
3874 if(BaseAddress != NULL)
3875 {
3876 *BaseAddress = SafeBaseAddress;
3877 }
3878 if(SectionOffset != NULL)
3879 {
3880 *SectionOffset = SafeSectionOffset;
3881 }
3882 if(ViewSize != NULL)
3883 {
3884 *ViewSize = SafeViewSize;
3885 }
3886 }
3887 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3888 {
3889 Status = _SEH2_GetExceptionCode();
3890 }
3891 _SEH2_END;
3892 }
3893
3894 return(Status);
3895 }
3896
3897 static VOID
3898 MmFreeSectionPage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
3899 PFN_TYPE Page, SWAPENTRY SwapEntry, BOOLEAN Dirty)
3900 {
3901 ULONG Entry;
3902 PFILE_OBJECT FileObject;
3903 PBCB Bcb;
3904 ULONG Offset;
3905 SWAPENTRY SavedSwapEntry;
3906 PMM_PAGEOP PageOp;
3907 NTSTATUS Status;
3908 PROS_SECTION_OBJECT Section;
3909 PMM_SECTION_SEGMENT Segment;
3910 PMMSUPPORT AddressSpace;
3911 PEPROCESS Process;
3912
3913 AddressSpace = (PMMSUPPORT)Context;
3914 Process = MmGetAddressSpaceOwner(AddressSpace);
3915
3916 Address = (PVOID)PAGE_ROUND_DOWN(Address);
3917
3918 Offset = ((ULONG_PTR)Address - (ULONG_PTR)MemoryArea->StartingAddress) +
3919 MemoryArea->Data.SectionData.ViewOffset;
3920
3921 Section = MemoryArea->Data.SectionData.Section;
3922 Segment = MemoryArea->Data.SectionData.Segment;
3923
3924 PageOp = MmCheckForPageOp(MemoryArea, NULL, NULL, Segment, Offset);
3925
3926 while (PageOp)
3927 {
3928 MmUnlockSectionSegment(Segment);
3929 MmUnlockAddressSpace(AddressSpace);
3930
3931 Status = MmspWaitForPageOpCompletionEvent(PageOp);
3932 if (Status != STATUS_SUCCESS)
3933 {
3934 DPRINT1("Failed to wait for page op, status = %x\n", Status);
3935 KeBugCheck(MEMORY_MANAGEMENT);
3936 }
3937
3938 MmLockAddressSpace(AddressSpace);
3939 MmLockSectionSegment(Segment);
3940 MmspCompleteAndReleasePageOp(PageOp);
3941 PageOp = MmCheckForPageOp(MemoryArea, NULL, NULL, Segment, Offset);
3942 }
3943
3944 Entry = MmGetPageEntrySectionSegment(Segment, Offset);
3945
3946 /*
3947 * For a dirty, datafile, non-private page mark it as dirty in the
3948 * cache manager.
3949 */
3950 if (Segment->Flags & MM_DATAFILE_SEGMENT)
3951 {
3952 if (Page == PFN_FROM_SSE(Entry) && Dirty)
3953 {
3954 FileObject = MemoryArea->Data.SectionData.Section->FileObject;
3955 Bcb = FileObject->SectionObjectPointer->SharedCacheMap;
3956 CcRosMarkDirtyCacheSegment(Bcb, Offset + Segment->FileOffset);
3957 ASSERT(SwapEntry == 0);
3958 }
3959 }
3960
3961 if (SwapEntry != 0)
3962 {
3963 /*
3964 * Sanity check
3965 */
3966 if (Segment->Flags & MM_PAGEFILE_SEGMENT)
3967 {
3968 DPRINT1("Found a swap entry for a page in a pagefile section.\n");
3969 KeBugCheck(MEMORY_MANAGEMENT);
3970 }
3971 MmFreeSwapPage(SwapEntry);
3972 }
3973 else if (Page != 0)
3974 {
3975 if (IS_SWAP_FROM_SSE(Entry) ||
3976 Page != PFN_FROM_SSE(Entry))
3977 {
3978 /*
3979 * Sanity check
3980 */
3981 if (Segment->Flags & MM_PAGEFILE_SEGMENT)
3982 {
3983 DPRINT1("Found a private page in a pagefile section.\n");
3984 KeBugCheck(MEMORY_MANAGEMENT);
3985 }
3986 /*
3987 * Just dereference private pages
3988 */
3989 SavedSwapEntry = MmGetSavedSwapEntryPage(Page);
3990 if (SavedSwapEntry != 0)
3991 {
3992 MmFreeSwapPage(SavedSwapEntry);
3993 MmSetSavedSwapEntryPage(Page, 0);
3994 }
3995 MmDeleteRmap(Page, Process, Address);
3996 MmReleasePageMemoryConsumer(MC_USER, Page);
3997 }
3998 else
3999 {
4000 MmDeleteRmap(Page, Process, Address);
4001 MmUnsharePageEntrySectionSegment(Section, Segment, Offset, Dirty, FALSE);
4002 }
4003 }
4004 }
4005
4006 static NTSTATUS
4007 MmUnmapViewOfSegment(PMMSUPPORT AddressSpace,
4008 PVOID BaseAddress)
4009 {
4010 NTSTATUS Status;
4011 PMEMORY_AREA MemoryArea;
4012 PROS_SECTION_OBJECT Section;
4013 PMM_SECTION_SEGMENT Segment;
4014 PLIST_ENTRY CurrentEntry;
4015 PMM_REGION CurrentRegion;
4016 PLIST_ENTRY RegionListHead;
4017
4018 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace,
4019 BaseAddress);
4020 if (MemoryArea == NULL)
4021 {
4022 return(STATUS_UNSUCCESSFUL);
4023 }
4024
4025 MemoryArea->DeleteInProgress = TRUE;
4026 Section = MemoryArea->Data.SectionData.Section;
4027 Segment = MemoryArea->Data.SectionData.Segment;
4028
4029 MmLockSectionSegment(Segment);
4030
4031 RegionListHead = &MemoryArea->Data.SectionData.RegionListHead;
4032 while (!IsListEmpty(RegionListHead))
4033 {
4034 CurrentEntry = RemoveHeadList(RegionListHead);
4035 CurrentRegion = CONTAINING_RECORD(CurrentEntry, MM_REGION, RegionListEntry);
4036 ExFreePoolWithTag(CurrentRegion, TAG_MM_REGION);
4037 }
4038
4039 if (Section->AllocationAttributes & SEC_PHYSICALMEMORY)
4040 {
4041 Status = MmFreeMemoryArea(AddressSpace,
4042 MemoryArea,
4043 NULL,
4044 NULL);
4045 }
4046 else
4047 {
4048 Status = MmFreeMemoryArea(AddressSpace,
4049 MemoryArea,
4050 MmFreeSectionPage,
4051 AddressSpace);
4052 }
4053 MmUnlockSectionSegment(Segment);
4054 ObDereferenceObject(Section);
4055 return(STATUS_SUCCESS);
4056 }
4057
4058 /*
4059 * @implemented
4060 */
4061 NTSTATUS NTAPI
4062 MmUnmapViewOfSection(PEPROCESS Process,
4063 PVOID BaseAddress)
4064 {
4065 NTSTATUS Status;
4066 PMEMORY_AREA MemoryArea;
4067 PMMSUPPORT AddressSpace;
4068 PROS_SECTION_OBJECT Section;
4069 PMM_PAGEOP PageOp;
4070 ULONG_PTR Offset;
4071 PVOID ImageBaseAddress = 0;
4072
4073 DPRINT("Opening memory area Process %x BaseAddress %x\n",
4074 Process, BaseAddress);
4075
4076 ASSERT(Process);
4077
4078 AddressSpace = &Process->Vm;
4079
4080 MmLockAddressSpace(AddressSpace);
4081 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace,
4082 BaseAddress);
4083 if (MemoryArea == NULL ||
4084 MemoryArea->Type != MEMORY_AREA_SECTION_VIEW ||
4085 MemoryArea->DeleteInProgress)
4086 {
4087 MmUnlockAddressSpace(AddressSpace);
4088 return STATUS_NOT_MAPPED_VIEW;
4089 }
4090
4091 MemoryArea->DeleteInProgress = TRUE;
4092
4093 while (MemoryArea->PageOpCount)
4094 {
4095 Offset = PAGE_ROUND_UP((ULONG_PTR)MemoryArea->EndingAddress - (ULONG_PTR)MemoryArea->StartingAddress);
4096
4097 while (Offset)
4098 {
4099 Offset -= PAGE_SIZE;
4100 PageOp = MmCheckForPageOp(MemoryArea, NULL, NULL,
4101 MemoryArea->Data.SectionData.Segment,
4102 Offset + MemoryArea->Data.SectionData.ViewOffset);
4103 if (PageOp)
4104 {
4105 MmUnlockAddressSpace(AddressSpace);
4106 Status = MmspWaitForPageOpCompletionEvent(PageOp);
4107 if (Status != STATUS_SUCCESS)
4108 {
4109 DPRINT1("Failed to wait for page op, status = %x\n", Status);
4110 KeBugCheck(MEMORY_MANAGEMENT);
4111 }
4112 MmLockAddressSpace(AddressSpace);
4113 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace,
4114 BaseAddress);
4115 if (MemoryArea == NULL ||
4116 MemoryArea->Type != MEMORY_AREA_SECTION_VIEW)
4117 {
4118 MmUnlockAddressSpace(AddressSpace);
4119 return STATUS_NOT_MAPPED_VIEW;
4120 }
4121 break;
4122 }
4123 }
4124 }
4125
4126 Section = MemoryArea->Data.SectionData.Section;
4127
4128 if (Section->AllocationAttributes & SEC_IMAGE)
4129 {
4130 ULONG i;
4131 ULONG NrSegments;
4132 PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
4133 PMM_SECTION_SEGMENT SectionSegments;
4134 PMM_SECTION_SEGMENT Segment;
4135
4136 Segment = MemoryArea->Data.SectionData.Segment;
4137 ImageSectionObject = Section->ImageSection;
4138 SectionSegments = ImageSectionObject->Segments;
4139 NrSegments = ImageSectionObject->NrSegments;
4140
4141 /* Search for the current segment within the section segments
4142 * and calculate the image base address */
4143 for (i = 0; i < NrSegments; i++)
4144 {
4145 if (!(SectionSegments[i].Characteristics & IMAGE_SCN_TYPE_NOLOAD))
4146 {
4147 if (Segment == &SectionSegments[i])
4148 {
4149 ImageBaseAddress = (char*)BaseAddress - (ULONG_PTR)SectionSegments[i].VirtualAddress;
4150 break;
4151 }
4152 }
4153 }
4154 if (i >= NrSegments)
4155 {
4156 KeBugCheck(MEMORY_MANAGEMENT);
4157 }
4158
4159 for (i = 0; i < NrSegments; i++)
4160 {
4161 if (!(SectionSegments[i].Characteristics & IMAGE_SCN_TYPE_NOLOAD))
4162 {
4163 PVOID SBaseAddress = (PVOID)
4164 ((char*)ImageBaseAddress + (ULONG_PTR)SectionSegments[i].VirtualAddress);
4165
4166 Status = MmUnmapViewOfSegment(AddressSpace, SBaseAddress);
4167 }
4168 }
4169 }
4170 else
4171 {
4172 Status = MmUnmapViewOfSegment(AddressSpace, BaseAddress);
4173 }
4174
4175 MmUnlockAddressSpace(AddressSpace);
4176
4177 /* Notify debugger */
4178 if (ImageBaseAddress) DbgkUnMapViewOfSection(ImageBaseAddress);
4179
4180 return(STATUS_SUCCESS);
4181 }
4182
4183 /**********************************************************************
4184 * NAME EXPORTED
4185 * NtUnmapViewOfSection
4186 *
4187 * DESCRIPTION
4188 *
4189 * ARGUMENTS
4190 * ProcessHandle
4191 *
4192 * BaseAddress
4193 *
4194 * RETURN VALUE
4195 * Status.
4196 *
4197 * REVISIONS
4198 */
4199 NTSTATUS NTAPI
4200 NtUnmapViewOfSection (HANDLE ProcessHandle,
4201 PVOID BaseAddress)
4202 {
4203 PEPROCESS Process;
4204 KPROCESSOR_MODE PreviousMode;
4205 NTSTATUS Status;
4206
4207 DPRINT("NtUnmapViewOfSection(ProcessHandle %x, BaseAddress %x)\n",
4208 ProcessHandle, BaseAddress);
4209
4210 PreviousMode = ExGetPreviousMode();
4211
4212 DPRINT("Referencing process\n");
4213 Status = ObReferenceObjectByHandle(ProcessHandle,
4214 PROCESS_VM_OPERATION,
4215 PsProcessType,
4216 PreviousMode,
4217 (PVOID*)(PVOID)&Process,
4218 NULL);
4219 if (!NT_SUCCESS(Status))
4220 {
4221 DPRINT("ObReferenceObjectByHandle failed (Status %x)\n", Status);
4222 return(Status);
4223 }
4224
4225 Status = MmUnmapViewOfSection(Process, BaseAddress);
4226
4227 ObDereferenceObject(Process);
4228
4229 return Status;
4230 }
4231
4232
4233 /**
4234 * Queries the information of a section object.
4235 *
4236 * @param SectionHandle
4237 * Handle to the section object. It must be opened with SECTION_QUERY
4238 * access.
4239 * @param SectionInformationClass
4240 * Index to a certain information structure. Can be either
4241 * SectionBasicInformation or SectionImageInformation. The latter
4242 * is valid only for sections that were created with the SEC_IMAGE
4243 * flag.
4244 * @param SectionInformation
4245 * Caller supplies storage for resulting information.
4246 * @param Length
4247 * Size of the supplied storage.
4248 * @param ResultLength
4249 * Data written.
4250 *
4251 * @return Status.
4252 *
4253 * @implemented
4254 */
4255 NTSTATUS NTAPI
4256 NtQuerySection(IN HANDLE SectionHandle,
4257 IN SECTION_INFORMATION_CLASS SectionInformationClass,
4258 OUT PVOID SectionInformation,
4259 IN ULONG SectionInformationLength,
4260 OUT PULONG ResultLength OPTIONAL)
4261 {
4262 PROS_SECTION_OBJECT Section;
4263 KPROCESSOR_MODE PreviousMode;
4264 NTSTATUS Status = STATUS_SUCCESS;
4265 PAGED_CODE();
4266
4267 PreviousMode = ExGetPreviousMode();
4268
4269 Status = DefaultQueryInfoBufferCheck(SectionInformationClass,
4270 ExSectionInfoClass,
4271 sizeof(ExSectionInfoClass) / sizeof(ExSectionInfoClass[0]),
4272 SectionInformation,
4273 SectionInformationLength,
4274 ResultLength,
4275 PreviousMode);
4276
4277 if(!NT_SUCCESS(Status))
4278 {
4279 DPRINT1("NtQuerySection() failed, Status: 0x%x\n", Status);
4280 return Status;
4281 }
4282
4283 Status = ObReferenceObjectByHandle(SectionHandle,
4284 SECTION_QUERY,
4285 MmSectionObjectType,
4286 PreviousMode,
4287 (PVOID*)(PVOID)&Section,
4288 NULL);
4289 if (NT_SUCCESS(Status))
4290 {
4291 switch (SectionInformationClass)
4292 {
4293 case SectionBasicInformation:
4294 {
4295 PSECTION_BASIC_INFORMATION Sbi = (PSECTION_BASIC_INFORMATION)SectionInformation;
4296
4297 _SEH2_TRY
4298 {
4299 Sbi->Attributes = Section->AllocationAttributes;
4300 if (Section->AllocationAttributes & SEC_IMAGE)
4301 {
4302 Sbi->BaseAddress = 0;
4303 Sbi->Size.QuadPart = 0;
4304 }
4305 else
4306 {
4307 Sbi->BaseAddress = (PVOID)Section->Segment->VirtualAddress;
4308 Sbi->Size.QuadPart = Section->Segment->Length;
4309 }
4310
4311 if (ResultLength != NULL)
4312 {
4313 *ResultLength = sizeof(SECTION_BASIC_INFORMATION);
4314 }
4315 Status = STATUS_SUCCESS;
4316 }
4317 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4318 {
4319 Status = _SEH2_GetExceptionCode();
4320 }
4321 _SEH2_END;
4322
4323 break;
4324 }
4325
4326 case SectionImageInformation:
4327 {
4328 PSECTION_IMAGE_INFORMATION Sii = (PSECTION_IMAGE_INFORMATION)SectionInformation;
4329
4330 _SEH2_TRY
4331 {
4332 memset(Sii, 0, sizeof(SECTION_IMAGE_INFORMATION));
4333 if (Section->AllocationAttributes & SEC_IMAGE)
4334 {
4335 PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
4336 ImageSectionObject = Section->ImageSection;
4337
4338 Sii->TransferAddress = (PVOID)ImageSectionObject->EntryPoint;
4339 Sii->MaximumStackSize = ImageSectionObject->StackReserve;
4340 Sii->CommittedStackSize = ImageSectionObject->StackCommit;
4341 Sii->SubSystemType = ImageSectionObject->Subsystem;
4342 Sii->SubSystemMinorVersion = ImageSectionObject->MinorSubsystemVersion;
4343 Sii->SubSystemMajorVersion = ImageSectionObject->MajorSubsystemVersion;
4344 Sii->ImageCharacteristics = ImageSectionObject->ImageCharacteristics;
4345 Sii->Machine = ImageSectionObject->Machine;
4346 Sii->ImageContainsCode = ImageSectionObject->Executable;
4347 }
4348
4349 if (ResultLength != NULL)
4350 {
4351 *ResultLength = sizeof(SECTION_IMAGE_INFORMATION);
4352 }
4353 Status = STATUS_SUCCESS;
4354 }
4355 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4356 {
4357 Status = _SEH2_GetExceptionCode();
4358 }
4359 _SEH2_END;
4360
4361 break;
4362 }
4363 }
4364
4365 ObDereferenceObject(Section);
4366 }
4367
4368 return(Status);
4369 }
4370
4371
4372 /**
4373 * Extends size of file backed section.
4374 *
4375 * @param SectionHandle
4376 * Handle to the section object. It must be opened with
4377 * SECTION_EXTEND_SIZE access.
4378 * @param NewMaximumSize
4379 * New maximum size of the section in bytes.
4380 *
4381 * @return Status.
4382 *
4383 * @todo Move the actual code to internal function MmExtendSection.
4384 * @unimplemented
4385 */
4386 NTSTATUS NTAPI
4387 NtExtendSection(IN HANDLE SectionHandle,
4388 IN PLARGE_INTEGER NewMaximumSize)
4389 {
4390 LARGE_INTEGER SafeNewMaximumSize;
4391 PROS_SECTION_OBJECT Section;
4392 KPROCESSOR_MODE PreviousMode;
4393 NTSTATUS Status = STATUS_SUCCESS;
4394
4395 PreviousMode = ExGetPreviousMode();
4396
4397 if(PreviousMode != KernelMode)
4398 {
4399 _SEH2_TRY
4400 {
4401 /* make a copy on the stack */
4402 SafeNewMaximumSize = ProbeForReadLargeInteger(NewMaximumSize);
4403 NewMaximumSize = &SafeNewMaximumSize;
4404 }
4405 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4406 {
4407 Status = _SEH2_GetExceptionCode();
4408 }
4409 _SEH2_END;
4410
4411 if(!NT_SUCCESS(Status))
4412 {
4413 return Status;
4414 }
4415 }
4416
4417 Status = ObReferenceObjectByHandle(SectionHandle,
4418 SECTION_EXTEND_SIZE,
4419 MmSectionObjectType,
4420 PreviousMode,
4421 (PVOID*)&Section,
4422 NULL);
4423 if (!NT_SUCCESS(Status))
4424 {
4425 return Status;
4426 }
4427
4428 if (!(Section->AllocationAttributes & SEC_FILE))
4429 {
4430 ObfDereferenceObject(Section);
4431 return STATUS_INVALID_PARAMETER;
4432 }
4433
4434 /*
4435 * - Acquire file extneding resource.
4436 * - Check if we're not resizing the section below it's actual size!
4437 * - Extend segments if needed.
4438 * - Set file information (FileAllocationInformation) to the new size.
4439 * - Release file extending resource.
4440 */
4441
4442 ObDereferenceObject(Section);
4443
4444 return STATUS_NOT_IMPLEMENTED;
4445 }
4446
4447
4448 /**********************************************************************
4449 * NAME INTERNAL
4450 * MmAllocateSection@4
4451 *
4452 * DESCRIPTION
4453 *
4454 * ARGUMENTS
4455 * Length
4456 *
4457 * RETURN VALUE
4458 *
4459 * NOTE
4460 * Code taken from ntoskrnl/mm/special.c.
4461 *
4462 * REVISIONS
4463 */
4464 PVOID NTAPI
4465 MmAllocateSection (IN ULONG Length, PVOID BaseAddress)
4466 {
4467 PVOID Result;
4468 MEMORY_AREA* marea;
4469 NTSTATUS Status;
4470 PMMSUPPORT AddressSpace;
4471 PHYSICAL_ADDRESS BoundaryAddressMultiple;
4472
4473 DPRINT("MmAllocateSection(Length %x)\n",Length);
4474
4475 BoundaryAddressMultiple.QuadPart = 0;
4476
4477 AddressSpace = MmGetKernelAddressSpace();
4478 Result = BaseAddress;
4479 MmLockAddressSpace(AddressSpace);
4480 Status = MmCreateMemoryArea (AddressSpace,
4481 MEMORY_AREA_SYSTEM,
4482 &Result,
4483 Length,
4484 0,
4485 &marea,
4486 FALSE,
4487 0,
4488 BoundaryAddressMultiple);
4489 MmUnlockAddressSpace(AddressSpace);
4490
4491 if (!NT_SUCCESS(Status))
4492 {
4493 return (NULL);
4494 }
4495 DPRINT("Result %p\n",Result);
4496
4497 /* Create a virtual mapping for this memory area */
4498 MmMapMemoryArea(Result, Length, MC_NPPOOL, PAGE_READWRITE);
4499
4500 return ((PVOID)Result);
4501 }
4502
4503
4504 /**********************************************************************
4505 * NAME EXPORTED
4506 * MmMapViewOfSection
4507 *
4508 * DESCRIPTION
4509 * Maps a view of a section into the virtual address space of a
4510 * process.
4511 *
4512 * ARGUMENTS
4513 * Section
4514 * Pointer to the section object.
4515 *
4516 * ProcessHandle
4517 * Pointer to the process.
4518 *
4519 * BaseAddress
4520 * Desired base address (or NULL) on entry;
4521 * Actual base address of the view on exit.
4522 *
4523 * ZeroBits
4524 * Number of high order address bits that must be zero.
4525 *
4526 * CommitSize
4527 * Size in bytes of the initially committed section of
4528 * the view.
4529 *
4530 * SectionOffset
4531 * Offset in bytes from the beginning of the section
4532 * to the beginning of the view.
4533 *
4534 * ViewSize
4535 * Desired length of map (or zero to map all) on entry
4536 * Actual length mapped on exit.
4537 *
4538 * InheritDisposition
4539 * Specified how the view is to be shared with
4540 * child processes.
4541 *
4542 * AllocationType
4543 * Type of allocation for the pages.
4544 *
4545 * Protect
4546 * Protection for the committed region of the view.
4547 *
4548 * RETURN VALUE
4549 * Status.
4550 *
4551 * @implemented
4552 */
4553 NTSTATUS NTAPI
4554 MmMapViewOfSection(IN PVOID SectionObject,
4555 IN PEPROCESS Process,
4556 IN OUT PVOID *BaseAddress,
4557 IN ULONG_PTR ZeroBits,
4558 IN SIZE_T CommitSize,
4559 IN OUT PLARGE_INTEGER SectionOffset OPTIONAL,
4560 IN OUT PSIZE_T ViewSize,
4561 IN SECTION_INHERIT InheritDisposition,
4562 IN ULONG AllocationType,
4563 IN ULONG Protect)
4564 {
4565 PROS_SECTION_OBJECT Section;
4566 PMMSUPPORT AddressSpace;
4567 ULONG ViewOffset;
4568 NTSTATUS Status = STATUS_SUCCESS;
4569
4570 ASSERT(Process);
4571
4572 if (!Protect || Protect & ~PAGE_FLAGS_VALID_FOR_SECTION)
4573 {
4574 return STATUS_INVALID_PAGE_PROTECTION;
4575 }
4576
4577
4578 Section = (PROS_SECTION_OBJECT)SectionObject;
4579 AddressSpace = &Process->Vm;
4580
4581 AllocationType |= (Section->AllocationAttributes & SEC_NO_CHANGE);
4582
4583 MmLockAddressSpace(AddressSpace);
4584
4585 if (Section->AllocationAttributes & SEC_IMAGE)
4586 {
4587 ULONG i;
4588 ULONG NrSegments;
4589 ULONG_PTR ImageBase;
4590 ULONG ImageSize;
4591 PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
4592 PMM_SECTION_SEGMENT SectionSegments;
4593
4594 ImageSectionObject = Section->ImageSection;
4595 SectionSegments = ImageSectionObject->Segments;
4596 NrSegments = ImageSectionObject->NrSegments;
4597
4598
4599 ImageBase = (ULONG_PTR)*BaseAddress;
4600 if (ImageBase == 0)
4601 {
4602 ImageBase = ImageSectionObject->ImageBase;
4603 }
4604
4605 ImageSize = 0;
4606 for (i = 0; i < NrSegments; i++)
4607 {
4608 if (!(SectionSegments[i].Characteristics & IMAGE_SCN_TYPE_NOLOAD))
4609 {
4610 ULONG_PTR MaxExtent;
4611 MaxExtent = (ULONG_PTR)SectionSegments[i].VirtualAddress +
4612 SectionSegments[i].Length;
4613 ImageSize = max(ImageSize, MaxExtent);
4614 }
4615 }
4616
4617 ImageSectionObject->ImageSize = ImageSize;
4618
4619 /* Check there is enough space to map the section at that point. */
4620 if (MmLocateMemoryAreaByRegion(AddressSpace, (PVOID)ImageBase,
4621 PAGE_ROUND_UP(ImageSize)) != NULL)
4622 {
4623 /* Fail if the user requested a fixed base address. */
4624 if ((*BaseAddress) != NULL)
4625 {
4626 MmUnlockAddressSpace(AddressSpace);
4627 return(STATUS_UNSUCCESSFUL);
4628 }
4629 /* Otherwise find a gap to map the image. */
4630 ImageBase = (ULONG_PTR)MmFindGap(AddressSpace, PAGE_ROUND_UP(ImageSize), PAGE_SIZE, FALSE);
4631 if (ImageBase == 0)
4632 {
4633 MmUnlockAddressSpace(AddressSpace);
4634 return(STATUS_UNSUCCESSFUL);
4635 }
4636 }
4637
4638 for (i = 0; i < NrSegments; i++)
4639 {
4640 if (!(SectionSegments[i].Characteristics & IMAGE_SCN_TYPE_NOLOAD))
4641 {
4642 PVOID SBaseAddress = (PVOID)
4643 ((char*)ImageBase + (ULONG_PTR)SectionSegments[i].VirtualAddress);
4644 MmLockSectionSegment(&SectionSegments[i]);
4645 Status = MmMapViewOfSegment(AddressSpace,
4646 Section,
4647 &SectionSegments[i],
4648 &SBaseAddress,
4649 SectionSegments[i].Length,
4650 SectionSegments[i].Protection,
4651 0,
4652 0);
4653 MmUnlockSectionSegment(&SectionSegments[i]);
4654 if (!NT_SUCCESS(Status))
4655 {
4656 MmUnlockAddressSpace(AddressSpace);
4657 return(Status);
4658 }
4659 }
4660 }
4661
4662 *BaseAddress = (PVOID)ImageBase;
4663 }
4664 else
4665 {
4666 /* check for write access */
4667 if ((Protect & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE)) &&
4668 !(Section->SectionPageProtection & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE)))
4669 {
4670 MmUnlockAddressSpace(AddressSpace);
4671 return STATUS_SECTION_PROTECTION;
4672 }
4673 /* check for read access */
4674 if ((Protect & (PAGE_READONLY|PAGE_WRITECOPY|PAGE_EXECUTE_READ|PAGE_EXECUTE_WRITECOPY)) &&
4675 !(Section->SectionPageProtection & (PAGE_READONLY|PAGE_READWRITE|PAGE_WRITECOPY|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)))
4676 {
4677 MmUnlockAddressSpace(AddressSpace);
4678 return STATUS_SECTION_PROTECTION;
4679 }
4680 /* check for execute access */
4681 if ((Protect & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)) &&
4682 !(Section->SectionPageProtection & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)))
4683 {
4684 MmUnlockAddressSpace(AddressSpace);
4685 return STATUS_SECTION_PROTECTION;
4686 }
4687
4688 if (ViewSize == NULL)
4689 {
4690 /* Following this pointer would lead to us to the dark side */
4691 /* What to do? Bugcheck? Return status? Do the mambo? */
4692 KeBugCheck(MEMORY_MANAGEMENT);
4693 }
4694
4695 if (SectionOffset == NULL)
4696 {
4697 ViewOffset = 0;
4698 }
4699 else
4700 {
4701 ViewOffset = SectionOffset->u.LowPart;
4702 }
4703
4704 if ((ViewOffset % PAGE_SIZE) != 0)
4705 {
4706 MmUnlockAddressSpace(AddressSpace);
4707 return(STATUS_MAPPED_ALIGNMENT);
4708 }
4709
4710 if ((*ViewSize) == 0)
4711 {
4712 (*ViewSize) = Section->MaximumSize.u.LowPart - ViewOffset;
4713 }
4714 else if (((*ViewSize)+ViewOffset) > Section->MaximumSize.u.LowPart)
4715 {
4716 (*ViewSize) = Section->MaximumSize.u.LowPart - ViewOffset;
4717 }
4718
4719 *ViewSize = PAGE_ROUND_UP(*ViewSize);
4720
4721 MmLockSectionSegment(Section->Segment);
4722 Status = MmMapViewOfSegment(AddressSpace,
4723 Section,
4724 Section->Segment,
4725 BaseAddress,
4726 *ViewSize,
4727 Protect,
4728 ViewOffset,
4729 AllocationType & (MEM_TOP_DOWN|SEC_NO_CHANGE));
4730 MmUnlockSectionSegment(Section->Segment);
4731 if (!NT_SUCCESS(Status))
4732 {
4733 MmUnlockAddressSpace(AddressSpace);
4734 return(Status);
4735 }
4736 }
4737
4738 MmUnlockAddressSpace(AddressSpace);
4739
4740 return(STATUS_SUCCESS);
4741 }
4742
4743 /*
4744 * @unimplemented
4745 */
4746 BOOLEAN NTAPI
4747 MmCanFileBeTruncated (IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
4748 IN PLARGE_INTEGER NewFileSize)
4749 {
4750 /* Check whether an ImageSectionObject exists */
4751 if (SectionObjectPointer->ImageSectionObject != NULL)
4752 {
4753 DPRINT1("ERROR: File can't be truncated because it has an image section\n");
4754 return FALSE;
4755 }
4756
4757 if (SectionObjectPointer->DataSectionObject != NULL)
4758 {
4759 PMM_SECTION_SEGMENT Segment;
4760
4761 Segment = (PMM_SECTION_SEGMENT)SectionObjectPointer->
4762 DataSectionObject;
4763
4764 if (Segment->ReferenceCount != 0)
4765 {
4766 /* Check size of file */
4767 if (SectionObjectPointer->SharedCacheMap)
4768 {
4769 PBCB Bcb = SectionObjectPointer->SharedCacheMap;
4770 if (NewFileSize->QuadPart <= Bcb->FileSize.QuadPart)
4771 {
4772 return FALSE;
4773 }
4774 }
4775 }
4776 else
4777 {
4778 /* Something must gone wrong
4779 * how can we have a Section but no
4780 * reference? */
4781 DPRINT1("ERROR: DataSectionObject without reference!\n");
4782 }
4783 }
4784
4785 DPRINT("FIXME: didn't check for outstanding write probes\n");
4786
4787 return TRUE;
4788 }
4789
4790
4791 /*
4792 * @unimplemented
4793 */
4794 BOOLEAN NTAPI
4795 MmDisableModifiedWriteOfSection (ULONG Unknown0)
4796 {
4797 UNIMPLEMENTED;
4798 return (FALSE);
4799 }
4800
4801 /*
4802 * @implemented
4803 */
4804 BOOLEAN NTAPI
4805 MmFlushImageSection (IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
4806 IN MMFLUSH_TYPE FlushType)
4807 {
4808 switch(FlushType)
4809 {
4810 case MmFlushForDelete:
4811 if (SectionObjectPointer->ImageSectionObject ||
4812 SectionObjectPointer->DataSectionObject)
4813 {
4814 return FALSE;
4815 }
4816 CcRosSetRemoveOnClose(SectionObjectPointer);
4817 return TRUE;
4818 case MmFlushForWrite:
4819 break;
4820 }
4821 return FALSE;
4822 }
4823
4824 /*
4825 * @unimplemented
4826 */
4827 BOOLEAN NTAPI
4828 MmForceSectionClosed (
4829 IN PSECTION_OBJECT_POINTERS SectionObjectPointer,
4830 IN BOOLEAN DelayClose)
4831 {
4832 UNIMPLEMENTED;
4833 return (FALSE);
4834 }
4835
4836
4837 /*
4838 * @implemented
4839 */
4840 NTSTATUS NTAPI
4841 MmMapViewInSystemSpace (IN PVOID SectionObject,
4842 OUT PVOID * MappedBase,
4843 IN OUT PULONG ViewSize)
4844 {
4845 PROS_SECTION_OBJECT Section;
4846 PMMSUPPORT AddressSpace;
4847 NTSTATUS Status;
4848
4849 DPRINT("MmMapViewInSystemSpace() called\n");
4850
4851 Section = (PROS_SECTION_OBJECT)SectionObject;
4852 AddressSpace = MmGetKernelAddressSpace();
4853
4854 MmLockAddressSpace(AddressSpace);
4855
4856
4857 if ((*ViewSize) == 0)
4858 {
4859 (*ViewSize) = Section->MaximumSize.u.LowPart;
4860 }
4861 else if ((*ViewSize) > Section->MaximumSize.u.LowPart)
4862 {
4863 (*ViewSize) = Section->MaximumSize.u.LowPart;
4864 }
4865
4866 MmLockSectionSegment(Section->Segment);
4867
4868
4869 Status = MmMapViewOfSegment(AddressSpace,
4870 Section,
4871 Section->Segment,
4872 MappedBase,
4873 *ViewSize,
4874 PAGE_READWRITE,
4875 0,
4876 0);
4877
4878 MmUnlockSectionSegment(Section->Segment);
4879 MmUnlockAddressSpace(AddressSpace);
4880
4881 return Status;
4882 }
4883
4884 /*
4885 * @unimplemented
4886 */
4887 NTSTATUS
4888 NTAPI
4889 MmMapViewInSessionSpace (
4890 IN PVOID Section,
4891 OUT PVOID *MappedBase,
4892 IN OUT PSIZE_T ViewSize
4893 )
4894 {
4895 UNIMPLEMENTED;
4896 return STATUS_NOT_IMPLEMENTED;
4897 }
4898
4899
4900 /*
4901 * @implemented
4902 */
4903 NTSTATUS NTAPI
4904 MmUnmapViewInSystemSpace (IN PVOID MappedBase)
4905 {
4906 PMMSUPPORT AddressSpace;
4907 NTSTATUS Status;
4908
4909 DPRINT("MmUnmapViewInSystemSpace() called\n");
4910
4911 AddressSpace = MmGetKernelAddressSpace();
4912
4913 Status = MmUnmapViewOfSegment(AddressSpace, MappedBase);
4914
4915 return Status;
4916 }
4917
4918 /*
4919 * @unimplemented
4920 */
4921 NTSTATUS
4922 NTAPI
4923 MmUnmapViewInSessionSpace (
4924 IN PVOID MappedBase
4925 )
4926 {
4927 UNIMPLEMENTED;
4928 return STATUS_NOT_IMPLEMENTED;
4929 }
4930
4931 /*
4932 * @unimplemented
4933 */
4934 NTSTATUS NTAPI
4935 MmSetBankedSection (ULONG Unknown0,
4936 ULONG Unknown1,
4937 ULONG Unknown2,
4938 ULONG Unknown3,
4939 ULONG Unknown4,
4940 ULONG Unknown5)
4941 {
4942 UNIMPLEMENTED;
4943 return (STATUS_NOT_IMPLEMENTED);
4944 }
4945
4946
4947 /**********************************************************************
4948 * NAME EXPORTED
4949 * MmCreateSection@
4950 *
4951 * DESCRIPTION
4952 * Creates a section object.
4953 *
4954 * ARGUMENTS
4955 * SectionObject (OUT)
4956 * Caller supplied storage for the resulting pointer
4957 * to a SECTION_OBJECT instance;
4958 *
4959 * DesiredAccess
4960 * Specifies the desired access to the section can be a
4961 * combination of:
4962 * STANDARD_RIGHTS_REQUIRED |
4963 * SECTION_QUERY |
4964 * SECTION_MAP_WRITE |
4965 * SECTION_MAP_READ |
4966 * SECTION_MAP_EXECUTE
4967 *
4968 * ObjectAttributes [OPTIONAL]
4969 * Initialized attributes for the object can be used
4970 * to create a named section;
4971 *
4972 * MaximumSize
4973 * Maximizes the size of the memory section. Must be
4974 * non-NULL for a page-file backed section.
4975 * If value specified for a mapped file and the file is
4976 * not large enough, file will be extended.
4977 *
4978 * SectionPageProtection
4979 * Can be a combination of:
4980 * PAGE_READONLY |
4981 * PAGE_READWRITE |
4982 * PAGE_WRITEONLY |
4983 * PAGE_WRITECOPY
4984 *
4985 * AllocationAttributes
4986 * Can be a combination of:
4987 * SEC_IMAGE |
4988 * SEC_RESERVE
4989 *
4990 * FileHandle
4991 * Handle to a file to create a section mapped to a file
4992 * instead of a memory backed section;
4993 *
4994 * File
4995 * Unknown.
4996 *
4997 * RETURN VALUE
4998 * Status.
4999 *
5000 * @implemented
5001 */
5002 NTSTATUS NTAPI
5003 MmCreateSection (OUT PVOID * Section,
5004 IN ACCESS_MASK DesiredAccess,
5005 IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
5006 IN PLARGE_INTEGER MaximumSize,
5007 IN ULONG SectionPageProtection,
5008 IN ULONG AllocationAttributes,
5009 IN HANDLE FileHandle OPTIONAL,
5010 IN PFILE_OBJECT File OPTIONAL)
5011 {
5012 ULONG Protection;
5013 PROS_SECTION_OBJECT *SectionObject = (PROS_SECTION_OBJECT *)Section;
5014
5015 /*
5016 * Check the protection
5017 */
5018 Protection = SectionPageProtection & ~(PAGE_GUARD|PAGE_NOCACHE);
5019 if (Protection != PAGE_READONLY &&
5020 Protection != PAGE_READWRITE &&
5021 Protection != PAGE_WRITECOPY &&
5022 Protection != PAGE_EXECUTE &&
5023 Protection != PAGE_EXECUTE_READ &&
5024 Protection != PAGE_EXECUTE_READWRITE &&
5025 Protection != PAGE_EXECUTE_WRITECOPY)
5026 {
5027 return STATUS_INVALID_PAGE_PROTECTION;
5028 }
5029
5030 if (AllocationAttributes & SEC_IMAGE)
5031 {
5032 return(MmCreateImageSection(SectionObject,
5033 DesiredAccess,
5034 ObjectAttributes,
5035 MaximumSize,
5036 SectionPageProtection,
5037 AllocationAttributes,
5038 FileHandle));
5039 }
5040
5041 if (FileHandle != NULL)
5042 {
5043 return(MmCreateDataFileSection(SectionObject,
5044 DesiredAccess,
5045 ObjectAttributes,
5046 MaximumSize,
5047 SectionPageProtection,
5048 AllocationAttributes,
5049 FileHandle));
5050 }
5051
5052 return(MmCreatePageFileSection(SectionObject,
5053 DesiredAccess,
5054 ObjectAttributes,
5055 MaximumSize,
5056 SectionPageProtection,
5057 AllocationAttributes));
5058 }
5059
5060 NTSTATUS
5061 NTAPI
5062 NtAllocateUserPhysicalPages(IN HANDLE ProcessHandle,
5063 IN OUT PULONG_PTR NumberOfPages,
5064 IN OUT PULONG_PTR UserPfnArray)
5065 {
5066 UNIMPLEMENTED;
5067 return STATUS_NOT_IMPLEMENTED;
5068 }
5069
5070 NTSTATUS
5071 NTAPI
5072 NtMapUserPhysicalPages(IN PVOID VirtualAddresses,
5073 IN ULONG_PTR NumberOfPages,
5074 IN OUT PULONG_PTR UserPfnArray)
5075 {
5076 UNIMPLEMENTED;
5077 return STATUS_NOT_IMPLEMENTED;
5078 }
5079
5080 NTSTATUS
5081 NTAPI
5082 NtMapUserPhysicalPagesScatter(IN PVOID *VirtualAddresses,
5083 IN ULONG_PTR NumberOfPages,
5084 IN OUT PULONG_PTR UserPfnArray)
5085 {
5086 UNIMPLEMENTED;
5087 return STATUS_NOT_IMPLEMENTED;
5088 }
5089
5090 NTSTATUS
5091 NTAPI
5092 NtFreeUserPhysicalPages(IN HANDLE ProcessHandle,
5093 IN OUT PULONG_PTR NumberOfPages,
5094 IN OUT PULONG_PTR UserPfnArray)
5095 {
5096 UNIMPLEMENTED;
5097 return STATUS_NOT_IMPLEMENTED;
5098 }
5099
5100 NTSTATUS
5101 NTAPI
5102 NtAreMappedFilesTheSame(IN PVOID File1MappedAsAnImage,
5103 IN PVOID File2MappedAsFile)
5104 {
5105 UNIMPLEMENTED;
5106 return STATUS_NOT_IMPLEMENTED;
5107 }
5108
5109
5110 /* EOF */
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