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Sync with trunk r62529.
[reactos.git] / ntoskrnl / mm / ARM3 / virtual.c
1 /*
2 * PROJECT: ReactOS Kernel
3 * LICENSE: BSD - See COPYING.ARM in the top level directory
4 * FILE: ntoskrnl/mm/ARM3/virtual.c
5 * PURPOSE: ARM Memory Manager Virtual Memory Management
6 * PROGRAMMERS: ReactOS Portable Systems Group
7 */
8
9 /* INCLUDES *******************************************************************/
10 /* So long, and Thanks for All the Fish */
11
12 #include <ntoskrnl.h>
13 #define NDEBUG
14 #include <debug.h>
15
16 #define MODULE_INVOLVED_IN_ARM3
17 #include "../ARM3/miarm.h"
18
19 #define MI_MAPPED_COPY_PAGES 14
20 #define MI_POOL_COPY_BYTES 512
21 #define MI_MAX_TRANSFER_SIZE 64 * 1024
22
23 NTSTATUS NTAPI
24 MiProtectVirtualMemory(IN PEPROCESS Process,
25 IN OUT PVOID *BaseAddress,
26 IN OUT PSIZE_T NumberOfBytesToProtect,
27 IN ULONG NewAccessProtection,
28 OUT PULONG OldAccessProtection OPTIONAL);
29
30 VOID
31 NTAPI
32 MiFlushTbAndCapture(IN PMMVAD FoundVad,
33 IN PMMPTE PointerPte,
34 IN ULONG ProtectionMask,
35 IN PMMPFN Pfn1,
36 IN BOOLEAN CaptureDirtyBit);
37
38
39 /* PRIVATE FUNCTIONS **********************************************************/
40
41 ULONG
42 NTAPI
43 MiCalculatePageCommitment(IN ULONG_PTR StartingAddress,
44 IN ULONG_PTR EndingAddress,
45 IN PMMVAD Vad,
46 IN PEPROCESS Process)
47 {
48 PMMPTE PointerPte, LastPte, PointerPde;
49 ULONG CommittedPages;
50
51 /* Compute starting and ending PTE and PDE addresses */
52 PointerPde = MiAddressToPde(StartingAddress);
53 PointerPte = MiAddressToPte(StartingAddress);
54 LastPte = MiAddressToPte(EndingAddress);
55
56 /* Handle commited pages first */
57 if (Vad->u.VadFlags.MemCommit == 1)
58 {
59 /* This is a committed VAD, so Assume the whole range is committed */
60 CommittedPages = BYTES_TO_PAGES(EndingAddress - StartingAddress);
61
62 /* Is the PDE demand-zero? */
63 PointerPde = MiAddressToPte(PointerPte);
64 if (PointerPde->u.Long != 0)
65 {
66 /* It is not. Is it valid? */
67 if (PointerPde->u.Hard.Valid == 0)
68 {
69 /* Fault it in */
70 PointerPte = MiPteToAddress(PointerPde);
71 MiMakeSystemAddressValid(PointerPte, Process);
72 }
73 }
74 else
75 {
76 /* It is, skip it and move to the next PDE, unless we're done */
77 PointerPde++;
78 PointerPte = MiPteToAddress(PointerPde);
79 if (PointerPte > LastPte) return CommittedPages;
80 }
81
82 /* Now loop all the PTEs in the range */
83 while (PointerPte <= LastPte)
84 {
85 /* Have we crossed a PDE boundary? */
86 if (MiIsPteOnPdeBoundary(PointerPte))
87 {
88 /* Is this PDE demand zero? */
89 PointerPde = MiAddressToPte(PointerPte);
90 if (PointerPde->u.Long != 0)
91 {
92 /* It isn't -- is it valid? */
93 if (PointerPde->u.Hard.Valid == 0)
94 {
95 /* Nope, fault it in */
96 PointerPte = MiPteToAddress(PointerPde);
97 MiMakeSystemAddressValid(PointerPte, Process);
98 }
99 }
100 else
101 {
102 /* It is, skip it and move to the next PDE */
103 PointerPde++;
104 PointerPte = MiPteToAddress(PointerPde);
105 continue;
106 }
107 }
108
109 /* Is this PTE demand zero? */
110 if (PointerPte->u.Long != 0)
111 {
112 /* It isn't -- is it a decommited, invalid, or faulted PTE? */
113 if ((PointerPte->u.Soft.Protection == MM_DECOMMIT) &&
114 (PointerPte->u.Hard.Valid == 0) &&
115 ((PointerPte->u.Soft.Prototype == 0) ||
116 (PointerPte->u.Soft.PageFileHigh == MI_PTE_LOOKUP_NEEDED)))
117 {
118 /* It is, so remove it from the count of commited pages */
119 CommittedPages--;
120 }
121 }
122
123 /* Move to the next PTE */
124 PointerPte++;
125 }
126
127 /* Return how many committed pages there still are */
128 return CommittedPages;
129 }
130
131 /* This is a non-commited VAD, so assume none of it is committed */
132 CommittedPages = 0;
133
134 /* Is the PDE demand-zero? */
135 PointerPde = MiAddressToPte(PointerPte);
136 if (PointerPde->u.Long != 0)
137 {
138 /* It isn't -- is it invalid? */
139 if (PointerPde->u.Hard.Valid == 0)
140 {
141 /* It is, so page it in */
142 PointerPte = MiPteToAddress(PointerPde);
143 MiMakeSystemAddressValid(PointerPte, Process);
144 }
145 }
146 else
147 {
148 /* It is, so skip it and move to the next PDE */
149 PointerPde++;
150 PointerPte = MiPteToAddress(PointerPde);
151 if (PointerPte > LastPte) return CommittedPages;
152 }
153
154 /* Loop all the PTEs in this PDE */
155 while (PointerPte <= LastPte)
156 {
157 /* Have we crossed a PDE boundary? */
158 if (MiIsPteOnPdeBoundary(PointerPte))
159 {
160 /* Is this new PDE demand-zero? */
161 PointerPde = MiAddressToPte(PointerPte);
162 if (PointerPde->u.Long != 0)
163 {
164 /* It isn't. Is it valid? */
165 if (PointerPde->u.Hard.Valid == 0)
166 {
167 /* It isn't, so make it valid */
168 PointerPte = MiPteToAddress(PointerPde);
169 MiMakeSystemAddressValid(PointerPte, Process);
170 }
171 }
172 else
173 {
174 /* It is, so skip it and move to the next one */
175 PointerPde++;
176 PointerPte = MiPteToAddress(PointerPde);
177 continue;
178 }
179 }
180
181 /* Is this PTE demand-zero? */
182 if (PointerPte->u.Long != 0)
183 {
184 /* Nope. Is it a valid, non-decommited, non-paged out PTE? */
185 if ((PointerPte->u.Soft.Protection != MM_DECOMMIT) ||
186 (PointerPte->u.Hard.Valid == 1) ||
187 ((PointerPte->u.Soft.Prototype == 1) &&
188 (PointerPte->u.Soft.PageFileHigh != MI_PTE_LOOKUP_NEEDED)))
189 {
190 /* It is! So we'll treat this as a committed page */
191 CommittedPages++;
192 }
193 }
194
195 /* Move to the next PTE */
196 PointerPte++;
197 }
198
199 /* Return how many committed pages we found in this VAD */
200 return CommittedPages;
201 }
202
203 ULONG
204 NTAPI
205 MiMakeSystemAddressValid(IN PVOID PageTableVirtualAddress,
206 IN PEPROCESS CurrentProcess)
207 {
208 NTSTATUS Status;
209 BOOLEAN WsShared = FALSE, WsSafe = FALSE, LockChange = FALSE;
210 PETHREAD CurrentThread = PsGetCurrentThread();
211
212 /* Must be a non-pool page table, since those are double-mapped already */
213 ASSERT(PageTableVirtualAddress > MM_HIGHEST_USER_ADDRESS);
214 ASSERT((PageTableVirtualAddress < MmPagedPoolStart) ||
215 (PageTableVirtualAddress > MmPagedPoolEnd));
216
217 /* Working set lock or PFN lock should be held */
218 ASSERT(KeAreAllApcsDisabled() == TRUE);
219
220 /* Check if the page table is valid */
221 while (!MmIsAddressValid(PageTableVirtualAddress))
222 {
223 /* Release the working set lock */
224 MiUnlockProcessWorkingSetForFault(CurrentProcess,
225 CurrentThread,
226 &WsSafe,
227 &WsShared);
228
229 /* Fault it in */
230 Status = MmAccessFault(FALSE, PageTableVirtualAddress, KernelMode, NULL);
231 if (!NT_SUCCESS(Status))
232 {
233 /* This should not fail */
234 KeBugCheckEx(KERNEL_DATA_INPAGE_ERROR,
235 1,
236 Status,
237 (ULONG_PTR)CurrentProcess,
238 (ULONG_PTR)PageTableVirtualAddress);
239 }
240
241 /* Lock the working set again */
242 MiLockProcessWorkingSetForFault(CurrentProcess,
243 CurrentThread,
244 WsSafe,
245 WsShared);
246
247 /* This flag will be useful later when we do better locking */
248 LockChange = TRUE;
249 }
250
251 /* Let caller know what the lock state is */
252 return LockChange;
253 }
254
255 ULONG
256 NTAPI
257 MiMakeSystemAddressValidPfn(IN PVOID VirtualAddress,
258 IN KIRQL OldIrql)
259 {
260 NTSTATUS Status;
261 BOOLEAN LockChange = FALSE;
262
263 /* Must be e kernel address */
264 ASSERT(VirtualAddress > MM_HIGHEST_USER_ADDRESS);
265
266 /* Check if the page is valid */
267 while (!MmIsAddressValid(VirtualAddress))
268 {
269 /* Release the PFN database */
270 KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
271
272 /* Fault it in */
273 Status = MmAccessFault(FALSE, VirtualAddress, KernelMode, NULL);
274 if (!NT_SUCCESS(Status))
275 {
276 /* This should not fail */
277 KeBugCheckEx(KERNEL_DATA_INPAGE_ERROR,
278 3,
279 Status,
280 0,
281 (ULONG_PTR)VirtualAddress);
282 }
283
284 /* This flag will be useful later when we do better locking */
285 LockChange = TRUE;
286
287 /* Lock the PFN database */
288 OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
289 }
290
291 /* Let caller know what the lock state is */
292 return LockChange;
293 }
294
295 PFN_COUNT
296 NTAPI
297 MiDeleteSystemPageableVm(IN PMMPTE PointerPte,
298 IN PFN_NUMBER PageCount,
299 IN ULONG Flags,
300 OUT PPFN_NUMBER ValidPages)
301 {
302 PFN_COUNT ActualPages = 0;
303 PETHREAD CurrentThread = PsGetCurrentThread();
304 PMMPFN Pfn1, Pfn2;
305 PFN_NUMBER PageFrameIndex, PageTableIndex;
306 KIRQL OldIrql;
307 ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
308
309 /* Lock the system working set */
310 MiLockWorkingSet(CurrentThread, &MmSystemCacheWs);
311
312 /* Loop all pages */
313 while (PageCount)
314 {
315 /* Make sure there's some data about the page */
316 if (PointerPte->u.Long)
317 {
318 /* As always, only handle current ARM3 scenarios */
319 ASSERT(PointerPte->u.Soft.Prototype == 0);
320 ASSERT(PointerPte->u.Soft.Transition == 0);
321
322 /* Normally this is one possibility -- freeing a valid page */
323 if (PointerPte->u.Hard.Valid)
324 {
325 /* Get the page PFN */
326 PageFrameIndex = PFN_FROM_PTE(PointerPte);
327 Pfn1 = MiGetPfnEntry(PageFrameIndex);
328
329 /* Should not have any working set data yet */
330 ASSERT(Pfn1->u1.WsIndex == 0);
331
332 /* Actual valid, legitimate, pages */
333 if (ValidPages) (*ValidPages)++;
334
335 /* Get the page table entry */
336 PageTableIndex = Pfn1->u4.PteFrame;
337 Pfn2 = MiGetPfnEntry(PageTableIndex);
338
339 /* Lock the PFN database */
340 OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
341
342 /* Delete it the page */
343 MI_SET_PFN_DELETED(Pfn1);
344 MiDecrementShareCount(Pfn1, PageFrameIndex);
345
346 /* Decrement the page table too */
347 MiDecrementShareCount(Pfn2, PageTableIndex);
348
349 /* Release the PFN database */
350 KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
351
352 /* Destroy the PTE */
353 MI_ERASE_PTE(PointerPte);
354 }
355 else
356 {
357 /*
358 * The only other ARM3 possibility is a demand zero page, which would
359 * mean freeing some of the paged pool pages that haven't even been
360 * touched yet, as part of a larger allocation.
361 *
362 * Right now, we shouldn't expect any page file information in the PTE
363 */
364 ASSERT(PointerPte->u.Soft.PageFileHigh == 0);
365
366 /* Destroy the PTE */
367 MI_ERASE_PTE(PointerPte);
368 }
369
370 /* Actual legitimate pages */
371 ActualPages++;
372 }
373
374 /* Keep going */
375 PointerPte++;
376 PageCount--;
377 }
378
379 /* Release the working set */
380 MiUnlockWorkingSet(CurrentThread, &MmSystemCacheWs);
381
382 /* Flush the entire TLB */
383 KeFlushEntireTb(TRUE, TRUE);
384
385 /* Done */
386 return ActualPages;
387 }
388
389 VOID
390 NTAPI
391 MiDeletePte(IN PMMPTE PointerPte,
392 IN PVOID VirtualAddress,
393 IN PEPROCESS CurrentProcess,
394 IN PMMPTE PrototypePte)
395 {
396 PMMPFN Pfn1;
397 MMPTE TempPte;
398 PFN_NUMBER PageFrameIndex;
399 PMMPDE PointerPde;
400
401 /* PFN lock must be held */
402 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL);
403
404 /* Capture the PTE */
405 TempPte = *PointerPte;
406
407 /* We only support valid PTEs for now */
408 ASSERT(TempPte.u.Hard.Valid == 1);
409 if (TempPte.u.Hard.Valid == 0)
410 {
411 /* Invalid PTEs not supported yet */
412 ASSERT(TempPte.u.Soft.Prototype == 0);
413 ASSERT(TempPte.u.Soft.Transition == 0);
414 }
415
416 /* Get the PFN entry */
417 PageFrameIndex = PFN_FROM_PTE(&TempPte);
418 Pfn1 = MiGetPfnEntry(PageFrameIndex);
419
420 /* Check if this is a valid, prototype PTE */
421 if (Pfn1->u3.e1.PrototypePte == 1)
422 {
423 /* Get the PDE and make sure it's faulted in */
424 PointerPde = MiPteToPde(PointerPte);
425 if (PointerPde->u.Hard.Valid == 0)
426 {
427 #if (_MI_PAGING_LEVELS == 2)
428 /* Could be paged pool access from a new process -- synchronize the page directories */
429 if (!NT_SUCCESS(MiCheckPdeForPagedPool(VirtualAddress)))
430 {
431 #endif
432 /* The PDE must be valid at this point */
433 KeBugCheckEx(MEMORY_MANAGEMENT,
434 0x61940,
435 (ULONG_PTR)PointerPte,
436 PointerPte->u.Long,
437 (ULONG_PTR)VirtualAddress);
438 }
439 #if (_MI_PAGING_LEVELS == 2)
440 }
441 #endif
442 /* Drop the share count */
443 MiDecrementShareCount(Pfn1, PageFrameIndex);
444
445 /* Either a fork, or this is the shared user data page */
446 if ((PointerPte <= MiHighestUserPte) && (PrototypePte != Pfn1->PteAddress))
447 {
448 /* If it's not the shared user page, then crash, since there's no fork() yet */
449 if ((PAGE_ALIGN(VirtualAddress) != (PVOID)USER_SHARED_DATA) ||
450 (MmHighestUserAddress <= (PVOID)USER_SHARED_DATA))
451 {
452 /* Must be some sort of memory corruption */
453 KeBugCheckEx(MEMORY_MANAGEMENT,
454 0x400,
455 (ULONG_PTR)PointerPte,
456 (ULONG_PTR)PrototypePte,
457 (ULONG_PTR)Pfn1->PteAddress);
458 }
459 }
460 }
461 else
462 {
463 /* Make sure the saved PTE address is valid */
464 if ((PMMPTE)((ULONG_PTR)Pfn1->PteAddress & ~0x1) != PointerPte)
465 {
466 /* The PFN entry is illegal, or invalid */
467 KeBugCheckEx(MEMORY_MANAGEMENT,
468 0x401,
469 (ULONG_PTR)PointerPte,
470 PointerPte->u.Long,
471 (ULONG_PTR)Pfn1->PteAddress);
472 }
473
474 /* There should only be 1 shared reference count */
475 ASSERT(Pfn1->u2.ShareCount == 1);
476
477 /* Drop the reference on the page table. */
478 MiDecrementShareCount(MiGetPfnEntry(Pfn1->u4.PteFrame), Pfn1->u4.PteFrame);
479
480 /* Mark the PFN for deletion and dereference what should be the last ref */
481 MI_SET_PFN_DELETED(Pfn1);
482 MiDecrementShareCount(Pfn1, PageFrameIndex);
483
484 /* We should eventually do this */
485 //CurrentProcess->NumberOfPrivatePages--;
486 }
487
488 /* Destroy the PTE and flush the TLB */
489 MI_ERASE_PTE(PointerPte);
490 KeFlushCurrentTb();
491 }
492
493 VOID
494 NTAPI
495 MiDeleteVirtualAddresses(IN ULONG_PTR Va,
496 IN ULONG_PTR EndingAddress,
497 IN PMMVAD Vad)
498 {
499 PMMPTE PointerPte, PrototypePte, LastPrototypePte;
500 PMMPDE PointerPde;
501 MMPTE TempPte;
502 PEPROCESS CurrentProcess;
503 KIRQL OldIrql;
504 BOOLEAN AddressGap = FALSE;
505 PSUBSECTION Subsection;
506
507 /* Get out if this is a fake VAD, RosMm will free the marea pages */
508 if ((Vad) && (Vad->u.VadFlags.Spare == 1)) return;
509
510 /* Grab the process and PTE/PDE for the address being deleted */
511 CurrentProcess = PsGetCurrentProcess();
512 PointerPde = MiAddressToPde(Va);
513 PointerPte = MiAddressToPte(Va);
514
515 /* Check if this is a section VAD or a VM VAD */
516 if (!(Vad) || (Vad->u.VadFlags.PrivateMemory) || !(Vad->FirstPrototypePte))
517 {
518 /* Don't worry about prototypes */
519 PrototypePte = LastPrototypePte = NULL;
520 }
521 else
522 {
523 /* Get the prototype PTE */
524 PrototypePte = Vad->FirstPrototypePte;
525 LastPrototypePte = Vad->FirstPrototypePte + 1;
526 }
527
528 /* In all cases, we don't support fork() yet */
529 ASSERT(CurrentProcess->CloneRoot == NULL);
530
531 /* Loop the PTE for each VA */
532 while (TRUE)
533 {
534 /* First keep going until we find a valid PDE */
535 while (!PointerPde->u.Long)
536 {
537 /* There are gaps in the address space */
538 AddressGap = TRUE;
539
540 /* Still no valid PDE, try the next 4MB (or whatever) */
541 PointerPde++;
542
543 /* Update the PTE on this new boundary */
544 PointerPte = MiPteToAddress(PointerPde);
545
546 /* Check if all the PDEs are invalid, so there's nothing to free */
547 Va = (ULONG_PTR)MiPteToAddress(PointerPte);
548 if (Va > EndingAddress) return;
549 }
550
551 /* Now check if the PDE is mapped in */
552 if (!PointerPde->u.Hard.Valid)
553 {
554 /* It isn't, so map it in */
555 PointerPte = MiPteToAddress(PointerPde);
556 MiMakeSystemAddressValid(PointerPte, CurrentProcess);
557 }
558
559 /* Now we should have a valid PDE, mapped in, and still have some VA */
560 ASSERT(PointerPde->u.Hard.Valid == 1);
561 ASSERT(Va <= EndingAddress);
562
563 /* Check if this is a section VAD with gaps in it */
564 if ((AddressGap) && (LastPrototypePte))
565 {
566 /* We need to skip to the next correct prototype PTE */
567 PrototypePte = MI_GET_PROTOTYPE_PTE_FOR_VPN(Vad, Va >> PAGE_SHIFT);
568
569 /* And we need the subsection to skip to the next last prototype PTE */
570 Subsection = MiLocateSubsection(Vad, Va >> PAGE_SHIFT);
571 if (Subsection)
572 {
573 /* Found it! */
574 LastPrototypePte = &Subsection->SubsectionBase[Subsection->PtesInSubsection];
575 }
576 else
577 {
578 /* No more subsections, we are done with prototype PTEs */
579 PrototypePte = NULL;
580 }
581 }
582
583 /* Lock the PFN Database while we delete the PTEs */
584 OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
585 do
586 {
587 /* Capture the PDE and make sure it exists */
588 TempPte = *PointerPte;
589 if (TempPte.u.Long)
590 {
591 MiDecrementPageTableReferences((PVOID)Va);
592
593 /* Check if the PTE is actually mapped in */
594 if (MI_IS_MAPPED_PTE(&TempPte))
595 {
596 /* Are we dealing with section VAD? */
597 if ((LastPrototypePte) && (PrototypePte > LastPrototypePte))
598 {
599 /* We need to skip to the next correct prototype PTE */
600 PrototypePte = MI_GET_PROTOTYPE_PTE_FOR_VPN(Vad, Va >> PAGE_SHIFT);
601
602 /* And we need the subsection to skip to the next last prototype PTE */
603 Subsection = MiLocateSubsection(Vad, Va >> PAGE_SHIFT);
604 if (Subsection)
605 {
606 /* Found it! */
607 LastPrototypePte = &Subsection->SubsectionBase[Subsection->PtesInSubsection];
608 }
609 else
610 {
611 /* No more subsections, we are done with prototype PTEs */
612 PrototypePte = NULL;
613 }
614 }
615
616 /* Check for prototype PTE */
617 if ((TempPte.u.Hard.Valid == 0) &&
618 (TempPte.u.Soft.Prototype == 1))
619 {
620 /* Just nuke it */
621 MI_ERASE_PTE(PointerPte);
622 }
623 else
624 {
625 /* Delete the PTE proper */
626 MiDeletePte(PointerPte,
627 (PVOID)Va,
628 CurrentProcess,
629 PrototypePte);
630 }
631 }
632 else
633 {
634 /* The PTE was never mapped, just nuke it here */
635 MI_ERASE_PTE(PointerPte);
636 }
637 }
638
639 /* Update the address and PTE for it */
640 Va += PAGE_SIZE;
641 PointerPte++;
642 PrototypePte++;
643
644 /* Making sure the PDE is still valid */
645 ASSERT(PointerPde->u.Hard.Valid == 1);
646 }
647 while ((Va & (PDE_MAPPED_VA - 1)) && (Va <= EndingAddress));
648
649 /* The PDE should still be valid at this point */
650 ASSERT(PointerPde->u.Hard.Valid == 1);
651
652 /* Check remaining PTE count (go back 1 page due to above loop) */
653 if (MiQueryPageTableReferences((PVOID)(Va - PAGE_SIZE)) == 0)
654 {
655 if (PointerPde->u.Long != 0)
656 {
657 /* Delete the PTE proper */
658 MiDeletePte(PointerPde,
659 MiPteToAddress(PointerPde),
660 CurrentProcess,
661 NULL);
662 }
663 }
664
665 /* Release the lock and get out if we're done */
666 KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
667 if (Va > EndingAddress) return;
668
669 /* Otherwise, we exited because we hit a new PDE boundary, so start over */
670 PointerPde = MiAddressToPde(Va);
671 AddressGap = FALSE;
672 }
673 }
674
675 LONG
676 MiGetExceptionInfo(IN PEXCEPTION_POINTERS ExceptionInfo,
677 OUT PBOOLEAN HaveBadAddress,
678 OUT PULONG_PTR BadAddress)
679 {
680 PEXCEPTION_RECORD ExceptionRecord;
681 PAGED_CODE();
682
683 //
684 // Assume default
685 //
686 *HaveBadAddress = FALSE;
687
688 //
689 // Get the exception record
690 //
691 ExceptionRecord = ExceptionInfo->ExceptionRecord;
692
693 //
694 // Look at the exception code
695 //
696 if ((ExceptionRecord->ExceptionCode == STATUS_ACCESS_VIOLATION) ||
697 (ExceptionRecord->ExceptionCode == STATUS_GUARD_PAGE_VIOLATION) ||
698 (ExceptionRecord->ExceptionCode == STATUS_IN_PAGE_ERROR))
699 {
700 //
701 // We can tell the address if we have more than one parameter
702 //
703 if (ExceptionRecord->NumberParameters > 1)
704 {
705 //
706 // Return the address
707 //
708 *HaveBadAddress = TRUE;
709 *BadAddress = ExceptionRecord->ExceptionInformation[1];
710 }
711 }
712
713 //
714 // Continue executing the next handler
715 //
716 return EXCEPTION_EXECUTE_HANDLER;
717 }
718
719 NTSTATUS
720 NTAPI
721 MiDoMappedCopy(IN PEPROCESS SourceProcess,
722 IN PVOID SourceAddress,
723 IN PEPROCESS TargetProcess,
724 OUT PVOID TargetAddress,
725 IN SIZE_T BufferSize,
726 IN KPROCESSOR_MODE PreviousMode,
727 OUT PSIZE_T ReturnSize)
728 {
729 PFN_NUMBER MdlBuffer[(sizeof(MDL) / sizeof(PFN_NUMBER)) + MI_MAPPED_COPY_PAGES + 1];
730 PMDL Mdl = (PMDL)MdlBuffer;
731 SIZE_T TotalSize, CurrentSize, RemainingSize;
732 volatile BOOLEAN FailedInProbe = FALSE, FailedInMapping = FALSE, FailedInMoving;
733 volatile BOOLEAN PagesLocked;
734 PVOID CurrentAddress = SourceAddress, CurrentTargetAddress = TargetAddress;
735 volatile PVOID MdlAddress;
736 KAPC_STATE ApcState;
737 BOOLEAN HaveBadAddress;
738 ULONG_PTR BadAddress;
739 NTSTATUS Status = STATUS_SUCCESS;
740 PAGED_CODE();
741
742 //
743 // Calculate the maximum amount of data to move
744 //
745 TotalSize = MI_MAPPED_COPY_PAGES * PAGE_SIZE;
746 if (BufferSize <= TotalSize) TotalSize = BufferSize;
747 CurrentSize = TotalSize;
748 RemainingSize = BufferSize;
749
750 //
751 // Loop as long as there is still data
752 //
753 while (RemainingSize > 0)
754 {
755 //
756 // Check if this transfer will finish everything off
757 //
758 if (RemainingSize < CurrentSize) CurrentSize = RemainingSize;
759
760 //
761 // Attach to the source address space
762 //
763 KeStackAttachProcess(&SourceProcess->Pcb, &ApcState);
764
765 //
766 // Reset state for this pass
767 //
768 MdlAddress = NULL;
769 PagesLocked = FALSE;
770 FailedInMoving = FALSE;
771 ASSERT(FailedInProbe == FALSE);
772
773 //
774 // Protect user-mode copy
775 //
776 _SEH2_TRY
777 {
778 //
779 // If this is our first time, probe the buffer
780 //
781 if ((CurrentAddress == SourceAddress) && (PreviousMode != KernelMode))
782 {
783 //
784 // Catch a failure here
785 //
786 FailedInProbe = TRUE;
787
788 //
789 // Do the probe
790 //
791 ProbeForRead(SourceAddress, BufferSize, sizeof(CHAR));
792
793 //
794 // Passed
795 //
796 FailedInProbe = FALSE;
797 }
798
799 //
800 // Initialize and probe and lock the MDL
801 //
802 MmInitializeMdl(Mdl, CurrentAddress, CurrentSize);
803 MmProbeAndLockPages(Mdl, PreviousMode, IoReadAccess);
804 PagesLocked = TRUE;
805
806 //
807 // Now map the pages
808 //
809 MdlAddress = MmMapLockedPagesSpecifyCache(Mdl,
810 KernelMode,
811 MmCached,
812 NULL,
813 FALSE,
814 HighPagePriority);
815 if (!MdlAddress)
816 {
817 //
818 // Use our SEH handler to pick this up
819 //
820 FailedInMapping = TRUE;
821 ExRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
822 }
823
824 //
825 // Now let go of the source and grab to the target process
826 //
827 KeUnstackDetachProcess(&ApcState);
828 KeStackAttachProcess(&TargetProcess->Pcb, &ApcState);
829
830 //
831 // Check if this is our first time through
832 //
833 if ((CurrentAddress == SourceAddress) && (PreviousMode != KernelMode))
834 {
835 //
836 // Catch a failure here
837 //
838 FailedInProbe = TRUE;
839
840 //
841 // Do the probe
842 //
843 ProbeForWrite(TargetAddress, BufferSize, sizeof(CHAR));
844
845 //
846 // Passed
847 //
848 FailedInProbe = FALSE;
849 }
850
851 //
852 // Now do the actual move
853 //
854 FailedInMoving = TRUE;
855 RtlCopyMemory(CurrentTargetAddress, MdlAddress, CurrentSize);
856 }
857 _SEH2_EXCEPT(MiGetExceptionInfo(_SEH2_GetExceptionInformation(),
858 &HaveBadAddress,
859 &BadAddress))
860 {
861 //
862 // Detach from whoever we may be attached to
863 //
864 KeUnstackDetachProcess(&ApcState);
865
866 //
867 // Check if we had mapped the pages
868 //
869 if (MdlAddress) MmUnmapLockedPages(MdlAddress, Mdl);
870
871 //
872 // Check if we had locked the pages
873 //
874 if (PagesLocked) MmUnlockPages(Mdl);
875
876 //
877 // Check if we hit working set quota
878 //
879 if (_SEH2_GetExceptionCode() == STATUS_WORKING_SET_QUOTA)
880 {
881 //
882 // Return the error
883 //
884 _SEH2_YIELD(return STATUS_WORKING_SET_QUOTA);
885 }
886
887 //
888 // Check if we failed during the probe or mapping
889 //
890 if ((FailedInProbe) || (FailedInMapping))
891 {
892 //
893 // Exit
894 //
895 Status = _SEH2_GetExceptionCode();
896 _SEH2_YIELD(return Status);
897 }
898
899 //
900 // Otherwise, we failed probably during the move
901 //
902 *ReturnSize = BufferSize - RemainingSize;
903 if (FailedInMoving)
904 {
905 //
906 // Check if we know exactly where we stopped copying
907 //
908 if (HaveBadAddress)
909 {
910 //
911 // Return the exact number of bytes copied
912 //
913 *ReturnSize = BadAddress - (ULONG_PTR)SourceAddress;
914 }
915 }
916
917 //
918 // Return partial copy
919 //
920 Status = STATUS_PARTIAL_COPY;
921 }
922 _SEH2_END;
923
924 //
925 // Check for SEH status
926 //
927 if (Status != STATUS_SUCCESS) return Status;
928
929 //
930 // Detach from target
931 //
932 KeUnstackDetachProcess(&ApcState);
933
934 //
935 // Unmap and unlock
936 //
937 MmUnmapLockedPages(MdlAddress, Mdl);
938 MmUnlockPages(Mdl);
939
940 //
941 // Update location and size
942 //
943 RemainingSize -= CurrentSize;
944 CurrentAddress = (PVOID)((ULONG_PTR)CurrentAddress + CurrentSize);
945 CurrentTargetAddress = (PVOID)((ULONG_PTR)CurrentTargetAddress + CurrentSize);
946 }
947
948 //
949 // All bytes read
950 //
951 *ReturnSize = BufferSize;
952 return STATUS_SUCCESS;
953 }
954
955 NTSTATUS
956 NTAPI
957 MiDoPoolCopy(IN PEPROCESS SourceProcess,
958 IN PVOID SourceAddress,
959 IN PEPROCESS TargetProcess,
960 OUT PVOID TargetAddress,
961 IN SIZE_T BufferSize,
962 IN KPROCESSOR_MODE PreviousMode,
963 OUT PSIZE_T ReturnSize)
964 {
965 UCHAR StackBuffer[MI_POOL_COPY_BYTES];
966 SIZE_T TotalSize, CurrentSize, RemainingSize;
967 volatile BOOLEAN FailedInProbe = FALSE, FailedInMoving, HavePoolAddress = FALSE;
968 PVOID CurrentAddress = SourceAddress, CurrentTargetAddress = TargetAddress;
969 PVOID PoolAddress;
970 KAPC_STATE ApcState;
971 BOOLEAN HaveBadAddress;
972 ULONG_PTR BadAddress;
973 NTSTATUS Status = STATUS_SUCCESS;
974 PAGED_CODE();
975
976 //
977 // Calculate the maximum amount of data to move
978 //
979 TotalSize = MI_MAX_TRANSFER_SIZE;
980 if (BufferSize <= MI_MAX_TRANSFER_SIZE) TotalSize = BufferSize;
981 CurrentSize = TotalSize;
982 RemainingSize = BufferSize;
983
984 //
985 // Check if we can use the stack
986 //
987 if (BufferSize <= MI_POOL_COPY_BYTES)
988 {
989 //
990 // Use it
991 //
992 PoolAddress = (PVOID)StackBuffer;
993 }
994 else
995 {
996 //
997 // Allocate pool
998 //
999 PoolAddress = ExAllocatePoolWithTag(NonPagedPool, TotalSize, 'VmRw');
1000 if (!PoolAddress) ASSERT(FALSE);
1001 HavePoolAddress = TRUE;
1002 }
1003
1004 //
1005 // Loop as long as there is still data
1006 //
1007 while (RemainingSize > 0)
1008 {
1009 //
1010 // Check if this transfer will finish everything off
1011 //
1012 if (RemainingSize < CurrentSize) CurrentSize = RemainingSize;
1013
1014 //
1015 // Attach to the source address space
1016 //
1017 KeStackAttachProcess(&SourceProcess->Pcb, &ApcState);
1018
1019 //
1020 // Reset state for this pass
1021 //
1022 FailedInMoving = FALSE;
1023 ASSERT(FailedInProbe == FALSE);
1024
1025 //
1026 // Protect user-mode copy
1027 //
1028 _SEH2_TRY
1029 {
1030 //
1031 // If this is our first time, probe the buffer
1032 //
1033 if ((CurrentAddress == SourceAddress) && (PreviousMode != KernelMode))
1034 {
1035 //
1036 // Catch a failure here
1037 //
1038 FailedInProbe = TRUE;
1039
1040 //
1041 // Do the probe
1042 //
1043 ProbeForRead(SourceAddress, BufferSize, sizeof(CHAR));
1044
1045 //
1046 // Passed
1047 //
1048 FailedInProbe = FALSE;
1049 }
1050
1051 //
1052 // Do the copy
1053 //
1054 RtlCopyMemory(PoolAddress, CurrentAddress, CurrentSize);
1055
1056 //
1057 // Now let go of the source and grab to the target process
1058 //
1059 KeUnstackDetachProcess(&ApcState);
1060 KeStackAttachProcess(&TargetProcess->Pcb, &ApcState);
1061
1062 //
1063 // Check if this is our first time through
1064 //
1065 if ((CurrentAddress == SourceAddress) && (PreviousMode != KernelMode))
1066 {
1067 //
1068 // Catch a failure here
1069 //
1070 FailedInProbe = TRUE;
1071
1072 //
1073 // Do the probe
1074 //
1075 ProbeForWrite(TargetAddress, BufferSize, sizeof(CHAR));
1076
1077 //
1078 // Passed
1079 //
1080 FailedInProbe = FALSE;
1081 }
1082
1083 //
1084 // Now do the actual move
1085 //
1086 FailedInMoving = TRUE;
1087 RtlCopyMemory(CurrentTargetAddress, PoolAddress, CurrentSize);
1088 }
1089 _SEH2_EXCEPT(MiGetExceptionInfo(_SEH2_GetExceptionInformation(),
1090 &HaveBadAddress,
1091 &BadAddress))
1092 {
1093 //
1094 // Detach from whoever we may be attached to
1095 //
1096 KeUnstackDetachProcess(&ApcState);
1097
1098 //
1099 // Check if we had allocated pool
1100 //
1101 if (HavePoolAddress) ExFreePoolWithTag(PoolAddress, 'VmRw');
1102
1103 //
1104 // Check if we failed during the probe
1105 //
1106 if (FailedInProbe)
1107 {
1108 //
1109 // Exit
1110 //
1111 Status = _SEH2_GetExceptionCode();
1112 _SEH2_YIELD(return Status);
1113 }
1114
1115 //
1116 // Otherwise, we failed, probably during the move
1117 //
1118 *ReturnSize = BufferSize - RemainingSize;
1119 if (FailedInMoving)
1120 {
1121 //
1122 // Check if we know exactly where we stopped copying
1123 //
1124 if (HaveBadAddress)
1125 {
1126 //
1127 // Return the exact number of bytes copied
1128 //
1129 *ReturnSize = BadAddress - (ULONG_PTR)SourceAddress;
1130 }
1131 }
1132
1133 //
1134 // Return partial copy
1135 //
1136 Status = STATUS_PARTIAL_COPY;
1137 }
1138 _SEH2_END;
1139
1140 //
1141 // Check for SEH status
1142 //
1143 if (Status != STATUS_SUCCESS) return Status;
1144
1145 //
1146 // Detach from target
1147 //
1148 KeUnstackDetachProcess(&ApcState);
1149
1150 //
1151 // Update location and size
1152 //
1153 RemainingSize -= CurrentSize;
1154 CurrentAddress = (PVOID)((ULONG_PTR)CurrentAddress + CurrentSize);
1155 CurrentTargetAddress = (PVOID)((ULONG_PTR)CurrentTargetAddress +
1156 CurrentSize);
1157 }
1158
1159 //
1160 // Check if we had allocated pool
1161 //
1162 if (HavePoolAddress) ExFreePoolWithTag(PoolAddress, 'VmRw');
1163
1164 //
1165 // All bytes read
1166 //
1167 *ReturnSize = BufferSize;
1168 return STATUS_SUCCESS;
1169 }
1170
1171 NTSTATUS
1172 NTAPI
1173 MmCopyVirtualMemory(IN PEPROCESS SourceProcess,
1174 IN PVOID SourceAddress,
1175 IN PEPROCESS TargetProcess,
1176 OUT PVOID TargetAddress,
1177 IN SIZE_T BufferSize,
1178 IN KPROCESSOR_MODE PreviousMode,
1179 OUT PSIZE_T ReturnSize)
1180 {
1181 NTSTATUS Status;
1182 PEPROCESS Process = SourceProcess;
1183
1184 //
1185 // Don't accept zero-sized buffers
1186 //
1187 if (!BufferSize) return STATUS_SUCCESS;
1188
1189 //
1190 // If we are copying from ourselves, lock the target instead
1191 //
1192 if (SourceProcess == PsGetCurrentProcess()) Process = TargetProcess;
1193
1194 //
1195 // Acquire rundown protection
1196 //
1197 if (!ExAcquireRundownProtection(&Process->RundownProtect))
1198 {
1199 //
1200 // Fail
1201 //
1202 return STATUS_PROCESS_IS_TERMINATING;
1203 }
1204
1205 //
1206 // See if we should use the pool copy
1207 //
1208 if (BufferSize > MI_POOL_COPY_BYTES)
1209 {
1210 //
1211 // Use MDL-copy
1212 //
1213 Status = MiDoMappedCopy(SourceProcess,
1214 SourceAddress,
1215 TargetProcess,
1216 TargetAddress,
1217 BufferSize,
1218 PreviousMode,
1219 ReturnSize);
1220 }
1221 else
1222 {
1223 //
1224 // Do pool copy
1225 //
1226 Status = MiDoPoolCopy(SourceProcess,
1227 SourceAddress,
1228 TargetProcess,
1229 TargetAddress,
1230 BufferSize,
1231 PreviousMode,
1232 ReturnSize);
1233 }
1234
1235 //
1236 // Release the lock
1237 //
1238 ExReleaseRundownProtection(&Process->RundownProtect);
1239 return Status;
1240 }
1241
1242 NTSTATUS
1243 NTAPI
1244 MmFlushVirtualMemory(IN PEPROCESS Process,
1245 IN OUT PVOID *BaseAddress,
1246 IN OUT PSIZE_T RegionSize,
1247 OUT PIO_STATUS_BLOCK IoStatusBlock)
1248 {
1249 PAGED_CODE();
1250 UNIMPLEMENTED;
1251
1252 //
1253 // Fake success
1254 //
1255 return STATUS_SUCCESS;
1256 }
1257
1258 ULONG
1259 NTAPI
1260 MiGetPageProtection(IN PMMPTE PointerPte)
1261 {
1262 MMPTE TempPte;
1263 PMMPFN Pfn;
1264 PAGED_CODE();
1265
1266 /* Copy this PTE's contents */
1267 TempPte = *PointerPte;
1268
1269 /* Assure it's not totally zero */
1270 ASSERT(TempPte.u.Long);
1271
1272 /* Check for a special prototype format */
1273 if (TempPte.u.Soft.Valid == 0 &&
1274 TempPte.u.Soft.Prototype == 1)
1275 {
1276 /* Unsupported now */
1277 UNIMPLEMENTED;
1278 ASSERT(FALSE);
1279 }
1280
1281 /* In the easy case of transition or demand zero PTE just return its protection */
1282 if (!TempPte.u.Hard.Valid) return MmProtectToValue[TempPte.u.Soft.Protection];
1283
1284 /* If we get here, the PTE is valid, so look up the page in PFN database */
1285 Pfn = MiGetPfnEntry(TempPte.u.Hard.PageFrameNumber);
1286 if (!Pfn->u3.e1.PrototypePte)
1287 {
1288 /* Return protection of the original pte */
1289 ASSERT(Pfn->u4.AweAllocation == 0);
1290 return MmProtectToValue[Pfn->OriginalPte.u.Soft.Protection];
1291 }
1292
1293 /* This is software PTE */
1294 DPRINT1("Prototype PTE: %lx %p\n", TempPte.u.Hard.PageFrameNumber, Pfn);
1295 DPRINT1("VA: %p\n", MiPteToAddress(&TempPte));
1296 DPRINT1("Mask: %lx\n", TempPte.u.Soft.Protection);
1297 DPRINT1("Mask2: %lx\n", Pfn->OriginalPte.u.Soft.Protection);
1298 return MmProtectToValue[TempPte.u.Soft.Protection];
1299 }
1300
1301 ULONG
1302 NTAPI
1303 MiQueryAddressState(IN PVOID Va,
1304 IN PMMVAD Vad,
1305 IN PEPROCESS TargetProcess,
1306 OUT PULONG ReturnedProtect,
1307 OUT PVOID *NextVa)
1308 {
1309
1310 PMMPTE PointerPte, ProtoPte;
1311 PMMPDE PointerPde;
1312 MMPTE TempPte, TempProtoPte;
1313 BOOLEAN DemandZeroPte = TRUE, ValidPte = FALSE;
1314 ULONG State = MEM_RESERVE, Protect = 0;
1315 ASSERT((Vad->StartingVpn <= ((ULONG_PTR)Va >> PAGE_SHIFT)) &&
1316 (Vad->EndingVpn >= ((ULONG_PTR)Va >> PAGE_SHIFT)));
1317
1318 /* Only normal VADs supported */
1319 ASSERT(Vad->u.VadFlags.VadType == VadNone);
1320
1321 /* Get the PDE and PTE for the address */
1322 PointerPde = MiAddressToPde(Va);
1323 PointerPte = MiAddressToPte(Va);
1324
1325 /* Return the next range */
1326 *NextVa = (PVOID)((ULONG_PTR)Va + PAGE_SIZE);
1327
1328 /* Is the PDE demand-zero? */
1329 if (PointerPde->u.Long != 0)
1330 {
1331 /* It is not. Is it valid? */
1332 if (PointerPde->u.Hard.Valid == 0)
1333 {
1334 /* Is isn't, fault it in */
1335 PointerPte = MiPteToAddress(PointerPde);
1336 MiMakeSystemAddressValid(PointerPte, TargetProcess);
1337 ValidPte = TRUE;
1338 }
1339 }
1340 else
1341 {
1342 /* It is, skip it and move to the next PDE */
1343 *NextVa = MiPdeToAddress(PointerPde + 1);
1344 }
1345
1346 /* Is it safe to try reading the PTE? */
1347 if (ValidPte)
1348 {
1349 /* FIXME: watch out for large pages */
1350 ASSERT(PointerPde->u.Hard.LargePage == FALSE);
1351
1352 /* Capture the PTE */
1353 TempPte = *PointerPte;
1354 if (TempPte.u.Long != 0)
1355 {
1356 /* The PTE is valid, so it's not zeroed out */
1357 DemandZeroPte = FALSE;
1358
1359 /* Is it a decommited, invalid, or faulted PTE? */
1360 if ((TempPte.u.Soft.Protection == MM_DECOMMIT) &&
1361 (TempPte.u.Hard.Valid == 0) &&
1362 ((TempPte.u.Soft.Prototype == 0) ||
1363 (TempPte.u.Soft.PageFileHigh == MI_PTE_LOOKUP_NEEDED)))
1364 {
1365 /* Otherwise our defaults should hold */
1366 ASSERT(Protect == 0);
1367 ASSERT(State == MEM_RESERVE);
1368 }
1369 else
1370 {
1371 /* This means it's committed */
1372 State = MEM_COMMIT;
1373
1374 /* We don't support these */
1375 ASSERT(Vad->u.VadFlags.VadType != VadDevicePhysicalMemory);
1376 ASSERT(Vad->u.VadFlags.VadType != VadRotatePhysical);
1377 ASSERT(Vad->u.VadFlags.VadType != VadAwe);
1378
1379 /* Get protection state of this page */
1380 Protect = MiGetPageProtection(PointerPte);
1381
1382 /* Check if this is an image-backed VAD */
1383 if ((TempPte.u.Soft.Valid == 0) &&
1384 (TempPte.u.Soft.Prototype == 1) &&
1385 (Vad->u.VadFlags.PrivateMemory == 0) &&
1386 (Vad->ControlArea))
1387 {
1388 DPRINT1("Not supported\n");
1389 ASSERT(FALSE);
1390 }
1391 }
1392 }
1393 }
1394
1395 /* Check if this was a demand-zero PTE, since we need to find the state */
1396 if (DemandZeroPte)
1397 {
1398 /* Not yet handled */
1399 ASSERT(Vad->u.VadFlags.VadType != VadDevicePhysicalMemory);
1400 ASSERT(Vad->u.VadFlags.VadType != VadAwe);
1401
1402 /* Check if this is private commited memory, or an section-backed VAD */
1403 if ((Vad->u.VadFlags.PrivateMemory == 0) && (Vad->ControlArea))
1404 {
1405 /* Tell caller about the next range */
1406 *NextVa = (PVOID)((ULONG_PTR)Va + PAGE_SIZE);
1407
1408 /* Get the prototype PTE for this VAD */
1409 ProtoPte = MI_GET_PROTOTYPE_PTE_FOR_VPN(Vad,
1410 (ULONG_PTR)Va >> PAGE_SHIFT);
1411 if (ProtoPte)
1412 {
1413 /* We should unlock the working set, but it's not being held! */
1414
1415 /* Is the prototype PTE actually valid (committed)? */
1416 TempProtoPte = *ProtoPte;
1417 if (TempProtoPte.u.Long)
1418 {
1419 /* Unless this is a memory-mapped file, handle it like private VAD */
1420 State = MEM_COMMIT;
1421 ASSERT(Vad->u.VadFlags.VadType != VadImageMap);
1422 Protect = MmProtectToValue[Vad->u.VadFlags.Protection];
1423 }
1424
1425 /* We should re-lock the working set */
1426 }
1427 }
1428 else if (Vad->u.VadFlags.MemCommit)
1429 {
1430 /* This is committed memory */
1431 State = MEM_COMMIT;
1432
1433 /* Convert the protection */
1434 Protect = MmProtectToValue[Vad->u.VadFlags.Protection];
1435 }
1436 }
1437
1438 /* Return the protection code */
1439 *ReturnedProtect = Protect;
1440 return State;
1441 }
1442
1443 NTSTATUS
1444 NTAPI
1445 MiQueryMemoryBasicInformation(IN HANDLE ProcessHandle,
1446 IN PVOID BaseAddress,
1447 OUT PVOID MemoryInformation,
1448 IN SIZE_T MemoryInformationLength,
1449 OUT PSIZE_T ReturnLength)
1450 {
1451 PEPROCESS TargetProcess;
1452 NTSTATUS Status = STATUS_SUCCESS;
1453 PMMVAD Vad = NULL;
1454 PVOID Address, NextAddress;
1455 BOOLEAN Found = FALSE;
1456 ULONG NewProtect, NewState;
1457 ULONG_PTR BaseVpn;
1458 MEMORY_BASIC_INFORMATION MemoryInfo;
1459 KAPC_STATE ApcState;
1460 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
1461 PMEMORY_AREA MemoryArea;
1462 SIZE_T ResultLength;
1463
1464 /* Check for illegal addresses in user-space, or the shared memory area */
1465 if ((BaseAddress > MM_HIGHEST_VAD_ADDRESS) ||
1466 (PAGE_ALIGN(BaseAddress) == (PVOID)MM_SHARED_USER_DATA_VA))
1467 {
1468 Address = PAGE_ALIGN(BaseAddress);
1469
1470 /* Make up an info structure describing this range */
1471 MemoryInfo.BaseAddress = Address;
1472 MemoryInfo.AllocationProtect = PAGE_READONLY;
1473 MemoryInfo.Type = MEM_PRIVATE;
1474
1475 /* Special case for shared data */
1476 if (Address == (PVOID)MM_SHARED_USER_DATA_VA)
1477 {
1478 MemoryInfo.AllocationBase = (PVOID)MM_SHARED_USER_DATA_VA;
1479 MemoryInfo.State = MEM_COMMIT;
1480 MemoryInfo.Protect = PAGE_READONLY;
1481 MemoryInfo.RegionSize = PAGE_SIZE;
1482 }
1483 else
1484 {
1485 MemoryInfo.AllocationBase = (PCHAR)MM_HIGHEST_VAD_ADDRESS + 1;
1486 MemoryInfo.State = MEM_RESERVE;
1487 MemoryInfo.Protect = PAGE_NOACCESS;
1488 MemoryInfo.RegionSize = (ULONG_PTR)MM_HIGHEST_USER_ADDRESS + 1 - (ULONG_PTR)Address;
1489 }
1490
1491 /* Return the data, NtQueryInformation already probed it*/
1492 if (PreviousMode != KernelMode)
1493 {
1494 _SEH2_TRY
1495 {
1496 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1497 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1498 }
1499 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
1500 {
1501 Status = _SEH2_GetExceptionCode();
1502 }
1503 _SEH2_END;
1504 }
1505 else
1506 {
1507 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1508 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1509 }
1510
1511 return Status;
1512 }
1513
1514 /* Check if this is for a local or remote process */
1515 if (ProcessHandle == NtCurrentProcess())
1516 {
1517 TargetProcess = PsGetCurrentProcess();
1518 }
1519 else
1520 {
1521 /* Reference the target process */
1522 Status = ObReferenceObjectByHandle(ProcessHandle,
1523 PROCESS_QUERY_INFORMATION,
1524 PsProcessType,
1525 ExGetPreviousMode(),
1526 (PVOID*)&TargetProcess,
1527 NULL);
1528 if (!NT_SUCCESS(Status)) return Status;
1529
1530 /* Attach to it now */
1531 KeStackAttachProcess(&TargetProcess->Pcb, &ApcState);
1532 }
1533
1534 /* Lock the address space and make sure the process isn't already dead */
1535 MmLockAddressSpace(&TargetProcess->Vm);
1536 if (TargetProcess->VmDeleted)
1537 {
1538 /* Unlock the address space of the process */
1539 MmUnlockAddressSpace(&TargetProcess->Vm);
1540
1541 /* Check if we were attached */
1542 if (ProcessHandle != NtCurrentProcess())
1543 {
1544 /* Detach and dereference the process */
1545 KeUnstackDetachProcess(&ApcState);
1546 ObDereferenceObject(TargetProcess);
1547 }
1548
1549 /* Bail out */
1550 DPRINT1("Process is dying\n");
1551 return STATUS_PROCESS_IS_TERMINATING;
1552 }
1553
1554 /* Loop the VADs */
1555 ASSERT(TargetProcess->VadRoot.NumberGenericTableElements);
1556 if (TargetProcess->VadRoot.NumberGenericTableElements)
1557 {
1558 /* Scan on the right */
1559 Vad = (PMMVAD)TargetProcess->VadRoot.BalancedRoot.RightChild;
1560 BaseVpn = (ULONG_PTR)BaseAddress >> PAGE_SHIFT;
1561 while (Vad)
1562 {
1563 /* Check if this VAD covers the allocation range */
1564 if ((BaseVpn >= Vad->StartingVpn) &&
1565 (BaseVpn <= Vad->EndingVpn))
1566 {
1567 /* We're done */
1568 Found = TRUE;
1569 break;
1570 }
1571
1572 /* Check if this VAD is too high */
1573 if (BaseVpn < Vad->StartingVpn)
1574 {
1575 /* Stop if there is no left child */
1576 if (!Vad->LeftChild) break;
1577
1578 /* Search on the left next */
1579 Vad = Vad->LeftChild;
1580 }
1581 else
1582 {
1583 /* Then this VAD is too low, keep searching on the right */
1584 ASSERT(BaseVpn > Vad->EndingVpn);
1585
1586 /* Stop if there is no right child */
1587 if (!Vad->RightChild) break;
1588
1589 /* Search on the right next */
1590 Vad = Vad->RightChild;
1591 }
1592 }
1593 }
1594
1595 /* Was a VAD found? */
1596 if (!Found)
1597 {
1598 Address = PAGE_ALIGN(BaseAddress);
1599
1600 /* Calculate region size */
1601 if (Vad)
1602 {
1603 if (Vad->StartingVpn >= BaseVpn)
1604 {
1605 /* Region size is the free space till the start of that VAD */
1606 MemoryInfo.RegionSize = (ULONG_PTR)(Vad->StartingVpn << PAGE_SHIFT) - (ULONG_PTR)Address;
1607 }
1608 else
1609 {
1610 /* Get the next VAD */
1611 Vad = (PMMVAD)MiGetNextNode((PMMADDRESS_NODE)Vad);
1612 if (Vad)
1613 {
1614 /* Region size is the free space till the start of that VAD */
1615 MemoryInfo.RegionSize = (ULONG_PTR)(Vad->StartingVpn << PAGE_SHIFT) - (ULONG_PTR)Address;
1616 }
1617 else
1618 {
1619 /* Maximum possible region size with that base address */
1620 MemoryInfo.RegionSize = (PCHAR)MM_HIGHEST_VAD_ADDRESS + 1 - (PCHAR)Address;
1621 }
1622 }
1623 }
1624 else
1625 {
1626 /* Maximum possible region size with that base address */
1627 MemoryInfo.RegionSize = (PCHAR)MM_HIGHEST_VAD_ADDRESS + 1 - (PCHAR)Address;
1628 }
1629
1630 /* Unlock the address space of the process */
1631 MmUnlockAddressSpace(&TargetProcess->Vm);
1632
1633 /* Check if we were attached */
1634 if (ProcessHandle != NtCurrentProcess())
1635 {
1636 /* Detach and derefernece the process */
1637 KeUnstackDetachProcess(&ApcState);
1638 ObDereferenceObject(TargetProcess);
1639 }
1640
1641 /* Build the rest of the initial information block */
1642 MemoryInfo.BaseAddress = Address;
1643 MemoryInfo.AllocationBase = NULL;
1644 MemoryInfo.AllocationProtect = 0;
1645 MemoryInfo.State = MEM_FREE;
1646 MemoryInfo.Protect = PAGE_NOACCESS;
1647 MemoryInfo.Type = 0;
1648
1649 /* Return the data, NtQueryInformation already probed it*/
1650 if (PreviousMode != KernelMode)
1651 {
1652 _SEH2_TRY
1653 {
1654 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1655 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1656 }
1657 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
1658 {
1659 Status = _SEH2_GetExceptionCode();
1660 }
1661 _SEH2_END;
1662 }
1663 else
1664 {
1665 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1666 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1667 }
1668
1669 return Status;
1670 }
1671
1672 /* Set the correct memory type based on what kind of VAD this is */
1673 if ((Vad->u.VadFlags.PrivateMemory) ||
1674 (Vad->u.VadFlags.VadType == VadRotatePhysical))
1675 {
1676 MemoryInfo.Type = MEM_PRIVATE;
1677 }
1678 else if (Vad->u.VadFlags.VadType == VadImageMap)
1679 {
1680 MemoryInfo.Type = MEM_IMAGE;
1681 }
1682 else
1683 {
1684 MemoryInfo.Type = MEM_MAPPED;
1685 }
1686
1687 /* Find the memory area the specified address belongs to */
1688 MemoryArea = MmLocateMemoryAreaByAddress(&TargetProcess->Vm, BaseAddress);
1689 ASSERT(MemoryArea != NULL);
1690
1691 /* Determine information dependent on the memory area type */
1692 if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
1693 {
1694 Status = MmQuerySectionView(MemoryArea, BaseAddress, &MemoryInfo, &ResultLength);
1695 if (!NT_SUCCESS(Status))
1696 {
1697 DPRINT1("MmQuerySectionView failed. MemoryArea=%p (%p-%p), BaseAddress=%p\n",
1698 MemoryArea, MemoryArea->StartingAddress, MemoryArea->EndingAddress, BaseAddress);
1699 NT_ASSERT(NT_SUCCESS(Status));
1700 }
1701 }
1702 else
1703 {
1704 /* Build the initial information block */
1705 Address = PAGE_ALIGN(BaseAddress);
1706 MemoryInfo.BaseAddress = Address;
1707 MemoryInfo.AllocationBase = (PVOID)(Vad->StartingVpn << PAGE_SHIFT);
1708 MemoryInfo.AllocationProtect = MmProtectToValue[Vad->u.VadFlags.Protection];
1709 MemoryInfo.Type = MEM_PRIVATE;
1710
1711 /* Find the largest chunk of memory which has the same state and protection mask */
1712 MemoryInfo.State = MiQueryAddressState(Address,
1713 Vad,
1714 TargetProcess,
1715 &MemoryInfo.Protect,
1716 &NextAddress);
1717 Address = NextAddress;
1718 while (((ULONG_PTR)Address >> PAGE_SHIFT) <= Vad->EndingVpn)
1719 {
1720 /* Keep going unless the state or protection mask changed */
1721 NewState = MiQueryAddressState(Address, Vad, TargetProcess, &NewProtect, &NextAddress);
1722 if ((NewState != MemoryInfo.State) || (NewProtect != MemoryInfo.Protect)) break;
1723 Address = NextAddress;
1724 }
1725
1726 /* Now that we know the last VA address, calculate the region size */
1727 MemoryInfo.RegionSize = ((ULONG_PTR)Address - (ULONG_PTR)MemoryInfo.BaseAddress);
1728 }
1729
1730 /* Unlock the address space of the process */
1731 MmUnlockAddressSpace(&TargetProcess->Vm);
1732
1733 /* Check if we were attached */
1734 if (ProcessHandle != NtCurrentProcess())
1735 {
1736 /* Detach and derefernece the process */
1737 KeUnstackDetachProcess(&ApcState);
1738 ObDereferenceObject(TargetProcess);
1739 }
1740
1741 /* Return the data, NtQueryInformation already probed it */
1742 if (PreviousMode != KernelMode)
1743 {
1744 _SEH2_TRY
1745 {
1746 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1747 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1748 }
1749 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
1750 {
1751 Status = _SEH2_GetExceptionCode();
1752 }
1753 _SEH2_END;
1754 }
1755 else
1756 {
1757 *(PMEMORY_BASIC_INFORMATION)MemoryInformation = MemoryInfo;
1758 if (ReturnLength) *ReturnLength = sizeof(MEMORY_BASIC_INFORMATION);
1759 }
1760
1761 /* All went well */
1762 DPRINT("Base: %p AllocBase: %p AllocProtect: %lx Protect: %lx "
1763 "State: %lx Type: %lx Size: %lx\n",
1764 MemoryInfo.BaseAddress, MemoryInfo.AllocationBase,
1765 MemoryInfo.AllocationProtect, MemoryInfo.Protect,
1766 MemoryInfo.State, MemoryInfo.Type, MemoryInfo.RegionSize);
1767
1768 return Status;
1769 }
1770
1771 BOOLEAN
1772 NTAPI
1773 MiIsEntireRangeCommitted(IN ULONG_PTR StartingAddress,
1774 IN ULONG_PTR EndingAddress,
1775 IN PMMVAD Vad,
1776 IN PEPROCESS Process)
1777 {
1778 PMMPTE PointerPte, LastPte, PointerPde;
1779 BOOLEAN OnBoundary = TRUE;
1780 PAGED_CODE();
1781
1782 /* Get the PDE and PTE addresses */
1783 PointerPde = MiAddressToPde(StartingAddress);
1784 PointerPte = MiAddressToPte(StartingAddress);
1785 LastPte = MiAddressToPte(EndingAddress);
1786
1787 /* Loop all the PTEs */
1788 while (PointerPte <= LastPte)
1789 {
1790 /* Check if we've hit an new PDE boundary */
1791 if (OnBoundary)
1792 {
1793 /* Is this PDE demand zero? */
1794 PointerPde = MiAddressToPte(PointerPte);
1795 if (PointerPde->u.Long != 0)
1796 {
1797 /* It isn't -- is it valid? */
1798 if (PointerPde->u.Hard.Valid == 0)
1799 {
1800 /* Nope, fault it in */
1801 PointerPte = MiPteToAddress(PointerPde);
1802 MiMakeSystemAddressValid(PointerPte, Process);
1803 }
1804 }
1805 else
1806 {
1807 /* The PTE was already valid, so move to the next one */
1808 PointerPde++;
1809 PointerPte = MiPteToAddress(PointerPde);
1810
1811 /* Is the entire VAD committed? If not, fail */
1812 if (!Vad->u.VadFlags.MemCommit) return FALSE;
1813
1814 /* Everything is committed so far past the range, return true */
1815 if (PointerPte > LastPte) return TRUE;
1816 }
1817 }
1818
1819 /* Is the PTE demand zero? */
1820 if (PointerPte->u.Long == 0)
1821 {
1822 /* Is the entire VAD committed? If not, fail */
1823 if (!Vad->u.VadFlags.MemCommit) return FALSE;
1824 }
1825 else
1826 {
1827 /* It isn't -- is it a decommited, invalid, or faulted PTE? */
1828 if ((PointerPte->u.Soft.Protection == MM_DECOMMIT) &&
1829 (PointerPte->u.Hard.Valid == 0) &&
1830 ((PointerPte->u.Soft.Prototype == 0) ||
1831 (PointerPte->u.Soft.PageFileHigh == MI_PTE_LOOKUP_NEEDED)))
1832 {
1833 /* Then part of the range is decommitted, so fail */
1834 return FALSE;
1835 }
1836 }
1837
1838 /* Move to the next PTE */
1839 PointerPte++;
1840 OnBoundary = MiIsPteOnPdeBoundary(PointerPte);
1841 }
1842
1843 /* All PTEs seem valid, and no VAD checks failed, the range is okay */
1844 return TRUE;
1845 }
1846
1847 NTSTATUS
1848 NTAPI
1849 MiRosProtectVirtualMemory(IN PEPROCESS Process,
1850 IN OUT PVOID *BaseAddress,
1851 IN OUT PSIZE_T NumberOfBytesToProtect,
1852 IN ULONG NewAccessProtection,
1853 OUT PULONG OldAccessProtection OPTIONAL)
1854 {
1855 PMEMORY_AREA MemoryArea;
1856 PMMSUPPORT AddressSpace;
1857 ULONG OldAccessProtection_;
1858 NTSTATUS Status;
1859
1860 *NumberOfBytesToProtect = PAGE_ROUND_UP((ULONG_PTR)(*BaseAddress) + (*NumberOfBytesToProtect)) - PAGE_ROUND_DOWN(*BaseAddress);
1861 *BaseAddress = (PVOID)PAGE_ROUND_DOWN(*BaseAddress);
1862
1863 AddressSpace = &Process->Vm;
1864 MmLockAddressSpace(AddressSpace);
1865 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, *BaseAddress);
1866 if (MemoryArea == NULL || MemoryArea->DeleteInProgress)
1867 {
1868 MmUnlockAddressSpace(AddressSpace);
1869 return STATUS_UNSUCCESSFUL;
1870 }
1871
1872 if (OldAccessProtection == NULL) OldAccessProtection = &OldAccessProtection_;
1873
1874 ASSERT(MemoryArea->Type == MEMORY_AREA_SECTION_VIEW);
1875 Status = MmProtectSectionView(AddressSpace,
1876 MemoryArea,
1877 *BaseAddress,
1878 *NumberOfBytesToProtect,
1879 NewAccessProtection,
1880 OldAccessProtection);
1881
1882 MmUnlockAddressSpace(AddressSpace);
1883
1884 return Status;
1885 }
1886
1887 NTSTATUS
1888 NTAPI
1889 MiProtectVirtualMemory(IN PEPROCESS Process,
1890 IN OUT PVOID *BaseAddress,
1891 IN OUT PSIZE_T NumberOfBytesToProtect,
1892 IN ULONG NewAccessProtection,
1893 OUT PULONG OldAccessProtection OPTIONAL)
1894 {
1895 PMEMORY_AREA MemoryArea;
1896 PMMVAD Vad;
1897 PMMSUPPORT AddressSpace;
1898 ULONG_PTR StartingAddress, EndingAddress;
1899 PMMPTE PointerPde, PointerPte, LastPte;
1900 MMPTE PteContents;
1901 PMMPFN Pfn1;
1902 ULONG ProtectionMask, OldProtect;
1903 BOOLEAN Committed;
1904 NTSTATUS Status = STATUS_SUCCESS;
1905 PETHREAD Thread = PsGetCurrentThread();
1906
1907 /* Calculate base address for the VAD */
1908 StartingAddress = (ULONG_PTR)PAGE_ALIGN((*BaseAddress));
1909 EndingAddress = (((ULONG_PTR)*BaseAddress + *NumberOfBytesToProtect - 1) | (PAGE_SIZE - 1));
1910
1911 /* Calculate the protection mask and make sure it's valid */
1912 ProtectionMask = MiMakeProtectionMask(NewAccessProtection);
1913 if (ProtectionMask == MM_INVALID_PROTECTION)
1914 {
1915 DPRINT1("Invalid protection mask\n");
1916 return STATUS_INVALID_PAGE_PROTECTION;
1917 }
1918
1919 /* Check for ROS specific memory area */
1920 MemoryArea = MmLocateMemoryAreaByAddress(&Process->Vm, *BaseAddress);
1921 if ((MemoryArea) && (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW))
1922 {
1923 /* Evil hack */
1924 return MiRosProtectVirtualMemory(Process,
1925 BaseAddress,
1926 NumberOfBytesToProtect,
1927 NewAccessProtection,
1928 OldAccessProtection);
1929 }
1930
1931 /* Lock the address space and make sure the process isn't already dead */
1932 AddressSpace = MmGetCurrentAddressSpace();
1933 MmLockAddressSpace(AddressSpace);
1934 if (Process->VmDeleted)
1935 {
1936 DPRINT1("Process is dying\n");
1937 Status = STATUS_PROCESS_IS_TERMINATING;
1938 goto FailPath;
1939 }
1940
1941 /* Get the VAD for this address range, and make sure it exists */
1942 Vad = (PMMVAD)MiCheckForConflictingNode(StartingAddress >> PAGE_SHIFT,
1943 EndingAddress >> PAGE_SHIFT,
1944 &Process->VadRoot);
1945 if (!Vad)
1946 {
1947 DPRINT("Could not find a VAD for this allocation\n");
1948 Status = STATUS_CONFLICTING_ADDRESSES;
1949 goto FailPath;
1950 }
1951
1952 /* Make sure the address is within this VAD's boundaries */
1953 if ((((ULONG_PTR)StartingAddress >> PAGE_SHIFT) < Vad->StartingVpn) ||
1954 (((ULONG_PTR)EndingAddress >> PAGE_SHIFT) > Vad->EndingVpn))
1955 {
1956 Status = STATUS_CONFLICTING_ADDRESSES;
1957 goto FailPath;
1958 }
1959
1960 /* These kinds of VADs are not supported atm */
1961 if ((Vad->u.VadFlags.VadType == VadAwe) ||
1962 (Vad->u.VadFlags.VadType == VadDevicePhysicalMemory) ||
1963 (Vad->u.VadFlags.VadType == VadLargePages))
1964 {
1965 DPRINT1("Illegal VAD for attempting to set protection\n");
1966 Status = STATUS_CONFLICTING_ADDRESSES;
1967 goto FailPath;
1968 }
1969
1970 /* Check for a VAD whose protection can't be changed */
1971 if (Vad->u.VadFlags.NoChange == 1)
1972 {
1973 DPRINT1("Trying to change protection of a NoChange VAD\n");
1974 Status = STATUS_INVALID_PAGE_PROTECTION;
1975 goto FailPath;
1976 }
1977
1978 /* Is this section, or private memory? */
1979 if (Vad->u.VadFlags.PrivateMemory == 0)
1980 {
1981 /* Not yet supported */
1982 if (Vad->u.VadFlags.VadType == VadLargePageSection)
1983 {
1984 DPRINT1("Illegal VAD for attempting to set protection\n");
1985 Status = STATUS_CONFLICTING_ADDRESSES;
1986 goto FailPath;
1987 }
1988
1989 /* Rotate VADs are not yet supported */
1990 if (Vad->u.VadFlags.VadType == VadRotatePhysical)
1991 {
1992 DPRINT1("Illegal VAD for attempting to set protection\n");
1993 Status = STATUS_CONFLICTING_ADDRESSES;
1994 goto FailPath;
1995 }
1996
1997 /* Not valid on section files */
1998 if (NewAccessProtection & (PAGE_NOCACHE | PAGE_WRITECOMBINE))
1999 {
2000 /* Fail */
2001 DPRINT1("Invalid protection flags for section\n");
2002 Status = STATUS_INVALID_PARAMETER_4;
2003 goto FailPath;
2004 }
2005
2006 /* Check if data or page file mapping protection PTE is compatible */
2007 if (!Vad->ControlArea->u.Flags.Image)
2008 {
2009 /* Not yet */
2010 DPRINT1("Fixme: Not checking for valid protection\n");
2011 }
2012
2013 /* This is a section, and this is not yet supported */
2014 DPRINT1("Section protection not yet supported\n");
2015 OldProtect = 0;
2016 }
2017 else
2018 {
2019 /* Private memory, check protection flags */
2020 if ((NewAccessProtection & PAGE_WRITECOPY) ||
2021 (NewAccessProtection & PAGE_EXECUTE_WRITECOPY))
2022 {
2023 DPRINT1("Invalid protection flags for private memory\n");
2024 Status = STATUS_INVALID_PARAMETER_4;
2025 goto FailPath;
2026 }
2027
2028 /* Lock the working set */
2029 MiLockProcessWorkingSetUnsafe(Process, Thread);
2030
2031 /* Check if all pages in this range are committed */
2032 Committed = MiIsEntireRangeCommitted(StartingAddress,
2033 EndingAddress,
2034 Vad,
2035 Process);
2036 if (!Committed)
2037 {
2038 /* Fail */
2039 DPRINT1("The entire range is not committed\n");
2040 Status = STATUS_NOT_COMMITTED;
2041 MiUnlockProcessWorkingSetUnsafe(Process, Thread);
2042 goto FailPath;
2043 }
2044
2045 /* Compute starting and ending PTE and PDE addresses */
2046 PointerPde = MiAddressToPde(StartingAddress);
2047 PointerPte = MiAddressToPte(StartingAddress);
2048 LastPte = MiAddressToPte(EndingAddress);
2049
2050 /* Make this PDE valid */
2051 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
2052
2053 /* Save protection of the first page */
2054 if (PointerPte->u.Long != 0)
2055 {
2056 /* Capture the page protection and make the PDE valid */
2057 OldProtect = MiGetPageProtection(PointerPte);
2058 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
2059 }
2060 else
2061 {
2062 /* Grab the old protection from the VAD itself */
2063 OldProtect = MmProtectToValue[Vad->u.VadFlags.Protection];
2064 }
2065
2066 /* Loop all the PTEs now */
2067 while (PointerPte <= LastPte)
2068 {
2069 /* Check if we've crossed a PDE boundary and make the new PDE valid too */
2070 if (MiIsPteOnPdeBoundary(PointerPte))
2071 {
2072 PointerPde = MiAddressToPte(PointerPte);
2073 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
2074 }
2075
2076 /* Capture the PTE and check if it was empty */
2077 PteContents = *PointerPte;
2078 if (PteContents.u.Long == 0)
2079 {
2080 /* This used to be a zero PTE and it no longer is, so we must add a
2081 reference to the pagetable. */
2082 MiIncrementPageTableReferences(MiPteToAddress(PointerPte));
2083 }
2084
2085 /* Check what kind of PTE we are dealing with */
2086 if (PteContents.u.Hard.Valid == 1)
2087 {
2088 /* Get the PFN entry */
2089 Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(&PteContents));
2090
2091 /* We don't support this yet */
2092 ASSERT(Pfn1->u3.e1.PrototypePte == 0);
2093
2094 /* Check if the page should not be accessible at all */
2095 if ((NewAccessProtection & PAGE_NOACCESS) ||
2096 (NewAccessProtection & PAGE_GUARD))
2097 {
2098 /* The page should be in the WS and we should make it transition now */
2099 DPRINT1("Making valid page invalid is not yet supported!\n");
2100 Status = STATUS_NOT_IMPLEMENTED;
2101 /* Unlock the working set */
2102 MiUnlockProcessWorkingSetUnsafe(Process, Thread);
2103 goto FailPath;
2104 }
2105
2106 /* Write the protection mask and write it with a TLB flush */
2107 Pfn1->OriginalPte.u.Soft.Protection = ProtectionMask;
2108 MiFlushTbAndCapture(Vad,
2109 PointerPte,
2110 ProtectionMask,
2111 Pfn1,
2112 TRUE);
2113 }
2114 else
2115 {
2116 /* We don't support these cases yet */
2117 ASSERT(PteContents.u.Soft.Prototype == 0);
2118 ASSERT(PteContents.u.Soft.Transition == 0);
2119
2120 /* The PTE is already demand-zero, just update the protection mask */
2121 PteContents.u.Soft.Protection = ProtectionMask;
2122 MI_WRITE_INVALID_PTE(PointerPte, PteContents);
2123 ASSERT(PointerPte->u.Long != 0);
2124 }
2125
2126 /* Move to the next PTE */
2127 PointerPte++;
2128 }
2129
2130 /* Unlock the working set */
2131 MiUnlockProcessWorkingSetUnsafe(Process, Thread);
2132 }
2133
2134 /* Unlock the address space */
2135 MmUnlockAddressSpace(AddressSpace);
2136
2137 /* Return parameters and success */
2138 *NumberOfBytesToProtect = EndingAddress - StartingAddress + 1;
2139 *BaseAddress = (PVOID)StartingAddress;
2140 *OldAccessProtection = OldProtect;
2141 return STATUS_SUCCESS;
2142
2143 FailPath:
2144 /* Unlock the address space and return the failure code */
2145 MmUnlockAddressSpace(AddressSpace);
2146 return Status;
2147 }
2148
2149 VOID
2150 NTAPI
2151 MiMakePdeExistAndMakeValid(IN PMMPTE PointerPde,
2152 IN PEPROCESS TargetProcess,
2153 IN KIRQL OldIrql)
2154 {
2155 PMMPTE PointerPte, PointerPpe, PointerPxe;
2156
2157 //
2158 // Sanity checks. The latter is because we only use this function with the
2159 // PFN lock not held, so it may go away in the future.
2160 //
2161 ASSERT(KeAreAllApcsDisabled() == TRUE);
2162 ASSERT(OldIrql == MM_NOIRQL);
2163
2164 //
2165 // Also get the PPE and PXE. This is okay not to #ifdef because they will
2166 // return the same address as the PDE on 2-level page table systems.
2167 //
2168 // If everything is already valid, there is nothing to do.
2169 //
2170 PointerPpe = MiAddressToPte(PointerPde);
2171 PointerPxe = MiAddressToPde(PointerPde);
2172 if ((PointerPxe->u.Hard.Valid) &&
2173 (PointerPpe->u.Hard.Valid) &&
2174 (PointerPde->u.Hard.Valid))
2175 {
2176 return;
2177 }
2178
2179 //
2180 // At least something is invalid, so begin by getting the PTE for the PDE itself
2181 // and then lookup each additional level. We must do it in this precise order
2182 // because the pagfault.c code (as well as in Windows) depends that the next
2183 // level up (higher) must be valid when faulting a lower level
2184 //
2185 PointerPte = MiPteToAddress(PointerPde);
2186 do
2187 {
2188 //
2189 // Make sure APCs continued to be disabled
2190 //
2191 ASSERT(KeAreAllApcsDisabled() == TRUE);
2192
2193 //
2194 // First, make the PXE valid if needed
2195 //
2196 if (!PointerPxe->u.Hard.Valid)
2197 {
2198 MiMakeSystemAddressValid(PointerPpe, TargetProcess);
2199 ASSERT(PointerPxe->u.Hard.Valid == 1);
2200 }
2201
2202 //
2203 // Next, the PPE
2204 //
2205 if (!PointerPpe->u.Hard.Valid)
2206 {
2207 MiMakeSystemAddressValid(PointerPde, TargetProcess);
2208 ASSERT(PointerPpe->u.Hard.Valid == 1);
2209 }
2210
2211 //
2212 // And finally, make the PDE itself valid.
2213 //
2214 MiMakeSystemAddressValid(PointerPte, TargetProcess);
2215
2216 //
2217 // This should've worked the first time so the loop is really just for
2218 // show -- ASSERT that we're actually NOT going to be looping.
2219 //
2220 ASSERT(PointerPxe->u.Hard.Valid == 1);
2221 ASSERT(PointerPpe->u.Hard.Valid == 1);
2222 ASSERT(PointerPde->u.Hard.Valid == 1);
2223 } while (!(PointerPxe->u.Hard.Valid) ||
2224 !(PointerPpe->u.Hard.Valid) ||
2225 !(PointerPde->u.Hard.Valid));
2226 }
2227
2228 VOID
2229 NTAPI
2230 MiProcessValidPteList(IN PMMPTE *ValidPteList,
2231 IN ULONG Count)
2232 {
2233 KIRQL OldIrql;
2234 ULONG i;
2235 MMPTE TempPte;
2236 PFN_NUMBER PageFrameIndex;
2237 PMMPFN Pfn1, Pfn2;
2238
2239 //
2240 // Acquire the PFN lock and loop all the PTEs in the list
2241 //
2242 OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
2243 for (i = 0; i != Count; i++)
2244 {
2245 //
2246 // The PTE must currently be valid
2247 //
2248 TempPte = *ValidPteList[i];
2249 ASSERT(TempPte.u.Hard.Valid == 1);
2250
2251 //
2252 // Get the PFN entry for the page itself, and then for its page table
2253 //
2254 PageFrameIndex = PFN_FROM_PTE(&TempPte);
2255 Pfn1 = MiGetPfnEntry(PageFrameIndex);
2256 Pfn2 = MiGetPfnEntry(Pfn1->u4.PteFrame);
2257
2258 //
2259 // Decrement the share count on the page table, and then on the page
2260 // itself
2261 //
2262 MiDecrementShareCount(Pfn2, Pfn1->u4.PteFrame);
2263 MI_SET_PFN_DELETED(Pfn1);
2264 MiDecrementShareCount(Pfn1, PageFrameIndex);
2265
2266 //
2267 // Make the page decommitted
2268 //
2269 MI_WRITE_INVALID_PTE(ValidPteList[i], MmDecommittedPte);
2270 }
2271
2272 //
2273 // All the PTEs have been dereferenced and made invalid, flush the TLB now
2274 // and then release the PFN lock
2275 //
2276 KeFlushCurrentTb();
2277 KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
2278 }
2279
2280 ULONG
2281 NTAPI
2282 MiDecommitPages(IN PVOID StartingAddress,
2283 IN PMMPTE EndingPte,
2284 IN PEPROCESS Process,
2285 IN PMMVAD Vad)
2286 {
2287 PMMPTE PointerPde, PointerPte, CommitPte = NULL;
2288 ULONG CommitReduction = 0;
2289 PMMPTE ValidPteList[256];
2290 ULONG PteCount = 0;
2291 PMMPFN Pfn1;
2292 MMPTE PteContents;
2293 PETHREAD CurrentThread = PsGetCurrentThread();
2294
2295 //
2296 // Get the PTE and PTE for the address, and lock the working set
2297 // If this was a VAD for a MEM_COMMIT allocation, also figure out where the
2298 // commited range ends so that we can do the right accounting.
2299 //
2300 PointerPde = MiAddressToPde(StartingAddress);
2301 PointerPte = MiAddressToPte(StartingAddress);
2302 if (Vad->u.VadFlags.MemCommit) CommitPte = MiAddressToPte(Vad->EndingVpn << PAGE_SHIFT);
2303 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
2304
2305 //
2306 // Make the PDE valid, and now loop through each page's worth of data
2307 //
2308 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
2309 while (PointerPte <= EndingPte)
2310 {
2311 //
2312 // Check if we've crossed a PDE boundary
2313 //
2314 if (MiIsPteOnPdeBoundary(PointerPte))
2315 {
2316 //
2317 // Get the new PDE and flush the valid PTEs we had built up until
2318 // now. This helps reduce the amount of TLB flushing we have to do.
2319 // Note that Windows does a much better job using timestamps and
2320 // such, and does not flush the entire TLB all the time, but right
2321 // now we have bigger problems to worry about than TLB flushing.
2322 //
2323 PointerPde = MiAddressToPde(StartingAddress);
2324 if (PteCount)
2325 {
2326 MiProcessValidPteList(ValidPteList, PteCount);
2327 PteCount = 0;
2328 }
2329
2330 //
2331 // Make this PDE valid
2332 //
2333 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
2334 }
2335
2336 //
2337 // Read this PTE. It might be active or still demand-zero.
2338 //
2339 PteContents = *PointerPte;
2340 if (PteContents.u.Long)
2341 {
2342 //
2343 // The PTE is active. It might be valid and in a working set, or
2344 // it might be a prototype PTE or paged out or even in transition.
2345 //
2346 if (PointerPte->u.Long == MmDecommittedPte.u.Long)
2347 {
2348 //
2349 // It's already decommited, so there's nothing for us to do here
2350 //
2351 CommitReduction++;
2352 }
2353 else
2354 {
2355 //
2356 // Remove it from the counters, and check if it was valid or not
2357 //
2358 //Process->NumberOfPrivatePages--;
2359 if (PteContents.u.Hard.Valid)
2360 {
2361 //
2362 // It's valid. At this point make sure that it is not a ROS
2363 // PFN. Also, we don't support ProtoPTEs in this code path.
2364 //
2365 Pfn1 = MiGetPfnEntry(PteContents.u.Hard.PageFrameNumber);
2366 ASSERT(MI_IS_ROS_PFN(Pfn1) == FALSE);
2367 ASSERT(Pfn1->u3.e1.PrototypePte == FALSE);
2368
2369 //
2370 // Flush any pending PTEs that we had not yet flushed, if our
2371 // list has gotten too big, then add this PTE to the flush list.
2372 //
2373 if (PteCount == 256)
2374 {
2375 MiProcessValidPteList(ValidPteList, PteCount);
2376 PteCount = 0;
2377 }
2378 ValidPteList[PteCount++] = PointerPte;
2379 }
2380 else
2381 {
2382 //
2383 // We do not support any of these other scenarios at the moment
2384 //
2385 ASSERT(PteContents.u.Soft.Prototype == 0);
2386 ASSERT(PteContents.u.Soft.Transition == 0);
2387 ASSERT(PteContents.u.Soft.PageFileHigh == 0);
2388
2389 //
2390 // So the only other possibility is that it is still a demand
2391 // zero PTE, in which case we undo the accounting we did
2392 // earlier and simply make the page decommitted.
2393 //
2394 //Process->NumberOfPrivatePages++;
2395 MI_WRITE_INVALID_PTE(PointerPte, MmDecommittedPte);
2396 }
2397 }
2398 }
2399 else
2400 {
2401 //
2402 // This used to be a zero PTE and it no longer is, so we must add a
2403 // reference to the pagetable.
2404 //
2405 MiIncrementPageTableReferences(StartingAddress);
2406
2407 //
2408 // Next, we account for decommitted PTEs and make the PTE as such
2409 //
2410 if (PointerPte > CommitPte) CommitReduction++;
2411 MI_WRITE_INVALID_PTE(PointerPte, MmDecommittedPte);
2412 }
2413
2414 //
2415 // Move to the next PTE and the next address
2416 //
2417 PointerPte++;
2418 StartingAddress = (PVOID)((ULONG_PTR)StartingAddress + PAGE_SIZE);
2419 }
2420
2421 //
2422 // Flush any dangling PTEs from the loop in the last page table, and then
2423 // release the working set and return the commit reduction accounting.
2424 //
2425 if (PteCount) MiProcessValidPteList(ValidPteList, PteCount);
2426 MiUnlockProcessWorkingSetUnsafe(Process, CurrentThread);
2427 return CommitReduction;
2428 }
2429
2430 /* PUBLIC FUNCTIONS ***********************************************************/
2431
2432 /*
2433 * @unimplemented
2434 */
2435 PVOID
2436 NTAPI
2437 MmGetVirtualForPhysical(IN PHYSICAL_ADDRESS PhysicalAddress)
2438 {
2439 UNIMPLEMENTED;
2440 return 0;
2441 }
2442
2443 /*
2444 * @unimplemented
2445 */
2446 PVOID
2447 NTAPI
2448 MmSecureVirtualMemory(IN PVOID Address,
2449 IN SIZE_T Length,
2450 IN ULONG Mode)
2451 {
2452 static BOOLEAN Warn; if (!Warn++) UNIMPLEMENTED;
2453 return Address;
2454 }
2455
2456 /*
2457 * @unimplemented
2458 */
2459 VOID
2460 NTAPI
2461 MmUnsecureVirtualMemory(IN PVOID SecureMem)
2462 {
2463 static BOOLEAN Warn; if (!Warn++) UNIMPLEMENTED;
2464 }
2465
2466 /* SYSTEM CALLS ***************************************************************/
2467
2468 NTSTATUS
2469 NTAPI
2470 NtReadVirtualMemory(IN HANDLE ProcessHandle,
2471 IN PVOID BaseAddress,
2472 OUT PVOID Buffer,
2473 IN SIZE_T NumberOfBytesToRead,
2474 OUT PSIZE_T NumberOfBytesRead OPTIONAL)
2475 {
2476 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
2477 PEPROCESS Process;
2478 NTSTATUS Status = STATUS_SUCCESS;
2479 SIZE_T BytesRead = 0;
2480 PAGED_CODE();
2481
2482 //
2483 // Check if we came from user mode
2484 //
2485 if (PreviousMode != KernelMode)
2486 {
2487 //
2488 // Validate the read addresses
2489 //
2490 if ((((ULONG_PTR)BaseAddress + NumberOfBytesToRead) < (ULONG_PTR)BaseAddress) ||
2491 (((ULONG_PTR)Buffer + NumberOfBytesToRead) < (ULONG_PTR)Buffer) ||
2492 (((ULONG_PTR)BaseAddress + NumberOfBytesToRead) > MmUserProbeAddress) ||
2493 (((ULONG_PTR)Buffer + NumberOfBytesToRead) > MmUserProbeAddress))
2494 {
2495 //
2496 // Don't allow to write into kernel space
2497 //
2498 return STATUS_ACCESS_VIOLATION;
2499 }
2500
2501 //
2502 // Enter SEH for probe
2503 //
2504 _SEH2_TRY
2505 {
2506 //
2507 // Probe the output value
2508 //
2509 if (NumberOfBytesRead) ProbeForWriteSize_t(NumberOfBytesRead);
2510 }
2511 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2512 {
2513 //
2514 // Get exception code
2515 //
2516 _SEH2_YIELD(return _SEH2_GetExceptionCode());
2517 }
2518 _SEH2_END;
2519 }
2520
2521 //
2522 // Don't do zero-byte transfers
2523 //
2524 if (NumberOfBytesToRead)
2525 {
2526 //
2527 // Reference the process
2528 //
2529 Status = ObReferenceObjectByHandle(ProcessHandle,
2530 PROCESS_VM_READ,
2531 PsProcessType,
2532 PreviousMode,
2533 (PVOID*)(&Process),
2534 NULL);
2535 if (NT_SUCCESS(Status))
2536 {
2537 //
2538 // Do the copy
2539 //
2540 Status = MmCopyVirtualMemory(Process,
2541 BaseAddress,
2542 PsGetCurrentProcess(),
2543 Buffer,
2544 NumberOfBytesToRead,
2545 PreviousMode,
2546 &BytesRead);
2547
2548 //
2549 // Dereference the process
2550 //
2551 ObDereferenceObject(Process);
2552 }
2553 }
2554
2555 //
2556 // Check if the caller sent this parameter
2557 //
2558 if (NumberOfBytesRead)
2559 {
2560 //
2561 // Enter SEH to guard write
2562 //
2563 _SEH2_TRY
2564 {
2565 //
2566 // Return the number of bytes read
2567 //
2568 *NumberOfBytesRead = BytesRead;
2569 }
2570 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2571 {
2572 }
2573 _SEH2_END;
2574 }
2575
2576 //
2577 // Return status
2578 //
2579 return Status;
2580 }
2581
2582 NTSTATUS
2583 NTAPI
2584 NtWriteVirtualMemory(IN HANDLE ProcessHandle,
2585 IN PVOID BaseAddress,
2586 IN PVOID Buffer,
2587 IN SIZE_T NumberOfBytesToWrite,
2588 OUT PSIZE_T NumberOfBytesWritten OPTIONAL)
2589 {
2590 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
2591 PEPROCESS Process;
2592 NTSTATUS Status = STATUS_SUCCESS;
2593 SIZE_T BytesWritten = 0;
2594 PAGED_CODE();
2595
2596 //
2597 // Check if we came from user mode
2598 //
2599 if (PreviousMode != KernelMode)
2600 {
2601 //
2602 // Validate the read addresses
2603 //
2604 if ((((ULONG_PTR)BaseAddress + NumberOfBytesToWrite) < (ULONG_PTR)BaseAddress) ||
2605 (((ULONG_PTR)Buffer + NumberOfBytesToWrite) < (ULONG_PTR)Buffer) ||
2606 (((ULONG_PTR)BaseAddress + NumberOfBytesToWrite) > MmUserProbeAddress) ||
2607 (((ULONG_PTR)Buffer + NumberOfBytesToWrite) > MmUserProbeAddress))
2608 {
2609 //
2610 // Don't allow to write into kernel space
2611 //
2612 return STATUS_ACCESS_VIOLATION;
2613 }
2614
2615 //
2616 // Enter SEH for probe
2617 //
2618 _SEH2_TRY
2619 {
2620 //
2621 // Probe the output value
2622 //
2623 if (NumberOfBytesWritten) ProbeForWriteSize_t(NumberOfBytesWritten);
2624 }
2625 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2626 {
2627 //
2628 // Get exception code
2629 //
2630 _SEH2_YIELD(return _SEH2_GetExceptionCode());
2631 }
2632 _SEH2_END;
2633 }
2634
2635 //
2636 // Don't do zero-byte transfers
2637 //
2638 if (NumberOfBytesToWrite)
2639 {
2640 //
2641 // Reference the process
2642 //
2643 Status = ObReferenceObjectByHandle(ProcessHandle,
2644 PROCESS_VM_WRITE,
2645 PsProcessType,
2646 PreviousMode,
2647 (PVOID*)&Process,
2648 NULL);
2649 if (NT_SUCCESS(Status))
2650 {
2651 //
2652 // Do the copy
2653 //
2654 Status = MmCopyVirtualMemory(PsGetCurrentProcess(),
2655 Buffer,
2656 Process,
2657 BaseAddress,
2658 NumberOfBytesToWrite,
2659 PreviousMode,
2660 &BytesWritten);
2661
2662 //
2663 // Dereference the process
2664 //
2665 ObDereferenceObject(Process);
2666 }
2667 }
2668
2669 //
2670 // Check if the caller sent this parameter
2671 //
2672 if (NumberOfBytesWritten)
2673 {
2674 //
2675 // Enter SEH to guard write
2676 //
2677 _SEH2_TRY
2678 {
2679 //
2680 // Return the number of bytes written
2681 //
2682 *NumberOfBytesWritten = BytesWritten;
2683 }
2684 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2685 {
2686 }
2687 _SEH2_END;
2688 }
2689
2690 //
2691 // Return status
2692 //
2693 return Status;
2694 }
2695
2696 NTSTATUS
2697 NTAPI
2698 NtProtectVirtualMemory(IN HANDLE ProcessHandle,
2699 IN OUT PVOID *UnsafeBaseAddress,
2700 IN OUT SIZE_T *UnsafeNumberOfBytesToProtect,
2701 IN ULONG NewAccessProtection,
2702 OUT PULONG UnsafeOldAccessProtection)
2703 {
2704 PEPROCESS Process;
2705 ULONG OldAccessProtection;
2706 ULONG Protection;
2707 PEPROCESS CurrentProcess = PsGetCurrentProcess();
2708 PVOID BaseAddress = NULL;
2709 SIZE_T NumberOfBytesToProtect = 0;
2710 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
2711 NTSTATUS Status;
2712 BOOLEAN Attached = FALSE;
2713 KAPC_STATE ApcState;
2714 PAGED_CODE();
2715
2716 //
2717 // Check for valid protection flags
2718 //
2719 Protection = NewAccessProtection & ~(PAGE_GUARD|PAGE_NOCACHE);
2720 if (Protection != PAGE_NOACCESS &&
2721 Protection != PAGE_READONLY &&
2722 Protection != PAGE_READWRITE &&
2723 Protection != PAGE_WRITECOPY &&
2724 Protection != PAGE_EXECUTE &&
2725 Protection != PAGE_EXECUTE_READ &&
2726 Protection != PAGE_EXECUTE_READWRITE &&
2727 Protection != PAGE_EXECUTE_WRITECOPY)
2728 {
2729 //
2730 // Fail
2731 //
2732 return STATUS_INVALID_PAGE_PROTECTION;
2733 }
2734
2735 //
2736 // Check if we came from user mode
2737 //
2738 if (PreviousMode != KernelMode)
2739 {
2740 //
2741 // Enter SEH for probing
2742 //
2743 _SEH2_TRY
2744 {
2745 //
2746 // Validate all outputs
2747 //
2748 ProbeForWritePointer(UnsafeBaseAddress);
2749 ProbeForWriteSize_t(UnsafeNumberOfBytesToProtect);
2750 ProbeForWriteUlong(UnsafeOldAccessProtection);
2751
2752 //
2753 // Capture them
2754 //
2755 BaseAddress = *UnsafeBaseAddress;
2756 NumberOfBytesToProtect = *UnsafeNumberOfBytesToProtect;
2757 }
2758 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2759 {
2760 //
2761 // Get exception code
2762 //
2763 _SEH2_YIELD(return _SEH2_GetExceptionCode());
2764 }
2765 _SEH2_END;
2766 }
2767 else
2768 {
2769 //
2770 // Capture directly
2771 //
2772 BaseAddress = *UnsafeBaseAddress;
2773 NumberOfBytesToProtect = *UnsafeNumberOfBytesToProtect;
2774 }
2775
2776 //
2777 // Catch illegal base address
2778 //
2779 if (BaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER_2;
2780
2781 //
2782 // Catch illegal region size
2783 //
2784 if ((MmUserProbeAddress - (ULONG_PTR)BaseAddress) < NumberOfBytesToProtect)
2785 {
2786 //
2787 // Fail
2788 //
2789 return STATUS_INVALID_PARAMETER_3;
2790 }
2791
2792 //
2793 // 0 is also illegal
2794 //
2795 if (!NumberOfBytesToProtect) return STATUS_INVALID_PARAMETER_3;
2796
2797 //
2798 // Get a reference to the process
2799 //
2800 Status = ObReferenceObjectByHandle(ProcessHandle,
2801 PROCESS_VM_OPERATION,
2802 PsProcessType,
2803 PreviousMode,
2804 (PVOID*)(&Process),
2805 NULL);
2806 if (!NT_SUCCESS(Status)) return Status;
2807
2808 //
2809 // Check if we should attach
2810 //
2811 if (CurrentProcess != Process)
2812 {
2813 //
2814 // Do it
2815 //
2816 KeStackAttachProcess(&Process->Pcb, &ApcState);
2817 Attached = TRUE;
2818 }
2819
2820 //
2821 // Do the actual work
2822 //
2823 Status = MiProtectVirtualMemory(Process,
2824 &BaseAddress,
2825 &NumberOfBytesToProtect,
2826 NewAccessProtection,
2827 &OldAccessProtection);
2828
2829 //
2830 // Detach if needed
2831 //
2832 if (Attached) KeUnstackDetachProcess(&ApcState);
2833
2834 //
2835 // Release reference
2836 //
2837 ObDereferenceObject(Process);
2838
2839 //
2840 // Enter SEH to return data
2841 //
2842 _SEH2_TRY
2843 {
2844 //
2845 // Return data to user
2846 //
2847 *UnsafeOldAccessProtection = OldAccessProtection;
2848 *UnsafeBaseAddress = BaseAddress;
2849 *UnsafeNumberOfBytesToProtect = NumberOfBytesToProtect;
2850 }
2851 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
2852 {
2853 }
2854 _SEH2_END;
2855
2856 //
2857 // Return status
2858 //
2859 return Status;
2860 }
2861
2862 FORCEINLINE
2863 BOOLEAN
2864 MI_IS_LOCKED_VA(
2865 PMMPFN Pfn1,
2866 ULONG LockType)
2867 {
2868 // HACK until we have proper WSLIST support
2869 PMMWSLE Wsle = &Pfn1->Wsle;
2870
2871 if ((LockType & MAP_PROCESS) && (Wsle->u1.e1.LockedInWs))
2872 return TRUE;
2873 if ((LockType & MAP_SYSTEM) && (Wsle->u1.e1.LockedInMemory))
2874 return TRUE;
2875
2876 return FALSE;
2877 }
2878
2879 FORCEINLINE
2880 VOID
2881 MI_LOCK_VA(
2882 PMMPFN Pfn1,
2883 ULONG LockType)
2884 {
2885 // HACK until we have proper WSLIST support
2886 PMMWSLE Wsle = &Pfn1->Wsle;
2887
2888 if (!Wsle->u1.e1.LockedInWs &&
2889 !Wsle->u1.e1.LockedInMemory)
2890 {
2891 MiReferenceProbedPageAndBumpLockCount(Pfn1);
2892 }
2893
2894 if (LockType & MAP_PROCESS)
2895 Wsle->u1.e1.LockedInWs = 1;
2896 if (LockType & MAP_SYSTEM)
2897 Wsle->u1.e1.LockedInMemory = 1;
2898 }
2899
2900 FORCEINLINE
2901 VOID
2902 MI_UNLOCK_VA(
2903 PMMPFN Pfn1,
2904 ULONG LockType)
2905 {
2906 // HACK until we have proper WSLIST support
2907 PMMWSLE Wsle = &Pfn1->Wsle;
2908
2909 if (LockType & MAP_PROCESS)
2910 Wsle->u1.e1.LockedInWs = 0;
2911 if (LockType & MAP_SYSTEM)
2912 Wsle->u1.e1.LockedInMemory = 0;
2913
2914 if (!Wsle->u1.e1.LockedInWs &&
2915 !Wsle->u1.e1.LockedInMemory)
2916 {
2917 MiDereferencePfnAndDropLockCount(Pfn1);
2918 }
2919 }
2920
2921 static
2922 NTSTATUS
2923 MiCheckVadsForLockOperation(
2924 _Inout_ PVOID *BaseAddress,
2925 _Inout_ PSIZE_T RegionSize,
2926 _Inout_ PVOID *EndAddress)
2927
2928 {
2929 PMMVAD Vad;
2930 PVOID CurrentVa;
2931
2932 /* Get the base address and align the start address */
2933 *EndAddress = (PUCHAR)*BaseAddress + *RegionSize;
2934 *EndAddress = ALIGN_UP_POINTER_BY(*EndAddress, PAGE_SIZE);
2935 *BaseAddress = ALIGN_DOWN_POINTER_BY(*BaseAddress, PAGE_SIZE);
2936
2937 /* First loop and check all VADs */
2938 CurrentVa = *BaseAddress;
2939 while (CurrentVa < *EndAddress)
2940 {
2941 /* Get VAD */
2942 Vad = MiLocateAddress(CurrentVa);
2943 if (Vad == NULL)
2944 {
2945 /// FIXME: this might be a memory area for a section view...
2946 return STATUS_ACCESS_VIOLATION;
2947 }
2948
2949 /* Check VAD type */
2950 if ((Vad->u.VadFlags.VadType != VadNone) &&
2951 (Vad->u.VadFlags.VadType != VadImageMap) &&
2952 (Vad->u.VadFlags.VadType != VadWriteWatch))
2953 {
2954 *EndAddress = CurrentVa;
2955 *RegionSize = (PUCHAR)*EndAddress - (PUCHAR)*BaseAddress;
2956 return STATUS_INCOMPATIBLE_FILE_MAP;
2957 }
2958
2959 CurrentVa = (PVOID)((Vad->EndingVpn + 1) << PAGE_SHIFT);
2960 }
2961
2962 *RegionSize = (PUCHAR)*EndAddress - (PUCHAR)*BaseAddress;
2963 return STATUS_SUCCESS;
2964 }
2965
2966 static
2967 NTSTATUS
2968 MiLockVirtualMemory(
2969 IN OUT PVOID *BaseAddress,
2970 IN OUT PSIZE_T RegionSize,
2971 IN ULONG MapType)
2972 {
2973 PEPROCESS CurrentProcess;
2974 PMMSUPPORT AddressSpace;
2975 PVOID CurrentVa, EndAddress;
2976 PMMPTE PointerPte, LastPte;
2977 PMMPDE PointerPde;
2978 #if (_MI_PAGING_LEVELS >= 3)
2979 PMMPDE PointerPpe;
2980 #endif
2981 #if (_MI_PAGING_LEVELS == 4)
2982 PMMPDE PointerPxe;
2983 #endif
2984 PMMPFN Pfn1;
2985 NTSTATUS Status, TempStatus;
2986
2987 /* Lock the address space */
2988 AddressSpace = MmGetCurrentAddressSpace();
2989 MmLockAddressSpace(AddressSpace);
2990
2991 /* Make sure we still have an address space */
2992 CurrentProcess = PsGetCurrentProcess();
2993 if (CurrentProcess->VmDeleted)
2994 {
2995 Status = STATUS_PROCESS_IS_TERMINATING;
2996 goto Cleanup;
2997 }
2998
2999 /* Check the VADs in the requested range */
3000 Status = MiCheckVadsForLockOperation(BaseAddress, RegionSize, &EndAddress);
3001 if (!NT_SUCCESS(Status))
3002 {
3003 goto Cleanup;
3004 }
3005
3006 /* Enter SEH for probing */
3007 _SEH2_TRY
3008 {
3009 /* Loop all pages and probe them */
3010 CurrentVa = *BaseAddress;
3011 while (CurrentVa < EndAddress)
3012 {
3013 (void)(*(volatile CHAR*)CurrentVa);
3014 CurrentVa = (PUCHAR)CurrentVa + PAGE_SIZE;
3015 }
3016 }
3017 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3018 {
3019 Status = _SEH2_GetExceptionCode();
3020 goto Cleanup;
3021 }
3022 _SEH2_END;
3023
3024 /* All pages were accessible, since we hold the address space lock, nothing
3025 can be de-committed. Assume success for now. */
3026 Status = STATUS_SUCCESS;
3027
3028 /* Get the PTE and PDE */
3029 PointerPte = MiAddressToPte(*BaseAddress);
3030 PointerPde = MiAddressToPde(*BaseAddress);
3031 #if (_MI_PAGING_LEVELS >= 3)
3032 PointerPpe = MiAddressToPpe(*BaseAddress);
3033 #endif
3034 #if (_MI_PAGING_LEVELS == 4)
3035 PointerPxe = MiAddressToPxe(*BaseAddress);
3036 #endif
3037
3038 /* Get the last PTE */
3039 LastPte = MiAddressToPte((PVOID)((ULONG_PTR)EndAddress - 1));
3040
3041 /* Lock the process working set */
3042 MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3043
3044 /* Loop the pages */
3045 do
3046 {
3047 /* Check for a page that is not accessible */
3048 while (
3049 #if (_MI_PAGING_LEVELS == 4)
3050 (PointerPxe->u.Hard.Valid == 0) ||
3051 #endif
3052 #if (_MI_PAGING_LEVELS >= 3)
3053 (PointerPpe->u.Hard.Valid == 0) ||
3054 #endif
3055 (PointerPde->u.Hard.Valid == 0) ||
3056 (PointerPte->u.Hard.Valid == 0))
3057 {
3058 /* Release process working set */
3059 MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3060
3061 /* Access the page */
3062 CurrentVa = MiPteToAddress(PointerPte);
3063
3064 //HACK: Pass a placeholder TrapInformation so the fault handler knows we're unlocked
3065 TempStatus = MmAccessFault(TRUE, CurrentVa, KernelMode, (PVOID)0xBADBADA3);
3066 if (!NT_SUCCESS(TempStatus))
3067 {
3068 // This should only happen, when remote backing storage is not accessible
3069 ASSERT(FALSE);
3070 Status = TempStatus;
3071 goto Cleanup;
3072 }
3073
3074 /* Lock the process working set */
3075 MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3076 }
3077
3078 /* Get the PFN */
3079 Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
3080 ASSERT(Pfn1 != NULL);
3081
3082 /* Check the previous lock status */
3083 if (MI_IS_LOCKED_VA(Pfn1, MapType))
3084 {
3085 Status = STATUS_WAS_LOCKED;
3086 }
3087
3088 /* Lock it */
3089 MI_LOCK_VA(Pfn1, MapType);
3090
3091 /* Go to the next PTE */
3092 PointerPte++;
3093
3094 /* Check if we're on a PDE boundary */
3095 if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
3096 #if (_MI_PAGING_LEVELS >= 3)
3097 if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
3098 #endif
3099 #if (_MI_PAGING_LEVELS == 4)
3100 if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
3101 #endif
3102 } while (PointerPte <= LastPte);
3103
3104 /* Release process working set */
3105 MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3106
3107 Cleanup:
3108 /* Unlock address space */
3109 MmUnlockAddressSpace(AddressSpace);
3110
3111 return Status;
3112 }
3113
3114 NTSTATUS
3115 NTAPI
3116 NtLockVirtualMemory(IN HANDLE ProcessHandle,
3117 IN OUT PVOID *BaseAddress,
3118 IN OUT PSIZE_T NumberOfBytesToLock,
3119 IN ULONG MapType)
3120 {
3121 PEPROCESS Process;
3122 PEPROCESS CurrentProcess = PsGetCurrentProcess();
3123 NTSTATUS Status;
3124 BOOLEAN Attached = FALSE;
3125 KAPC_STATE ApcState;
3126 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
3127 PVOID CapturedBaseAddress;
3128 SIZE_T CapturedBytesToLock;
3129 PAGED_CODE();
3130
3131 //
3132 // Validate flags
3133 //
3134 if ((MapType & ~(MAP_PROCESS | MAP_SYSTEM)))
3135 {
3136 //
3137 // Invalid set of flags
3138 //
3139 return STATUS_INVALID_PARAMETER;
3140 }
3141
3142 //
3143 // At least one flag must be specified
3144 //
3145 if (!(MapType & (MAP_PROCESS | MAP_SYSTEM)))
3146 {
3147 //
3148 // No flag given
3149 //
3150 return STATUS_INVALID_PARAMETER;
3151 }
3152
3153 //
3154 // Enter SEH for probing
3155 //
3156 _SEH2_TRY
3157 {
3158 //
3159 // Validate output data
3160 //
3161 ProbeForWritePointer(BaseAddress);
3162 ProbeForWriteSize_t(NumberOfBytesToLock);
3163
3164 //
3165 // Capture it
3166 //
3167 CapturedBaseAddress = *BaseAddress;
3168 CapturedBytesToLock = *NumberOfBytesToLock;
3169 }
3170 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3171 {
3172 //
3173 // Get exception code
3174 //
3175 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3176 }
3177 _SEH2_END;
3178
3179 //
3180 // Catch illegal base address
3181 //
3182 if (CapturedBaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER;
3183
3184 //
3185 // Catch illegal region size
3186 //
3187 if ((MmUserProbeAddress - (ULONG_PTR)CapturedBaseAddress) < CapturedBytesToLock)
3188 {
3189 //
3190 // Fail
3191 //
3192 return STATUS_INVALID_PARAMETER;
3193 }
3194
3195 //
3196 // 0 is also illegal
3197 //
3198 if (!CapturedBytesToLock) return STATUS_INVALID_PARAMETER;
3199
3200 //
3201 // Get a reference to the process
3202 //
3203 Status = ObReferenceObjectByHandle(ProcessHandle,
3204 PROCESS_VM_OPERATION,
3205 PsProcessType,
3206 PreviousMode,
3207 (PVOID*)(&Process),
3208 NULL);
3209 if (!NT_SUCCESS(Status)) return Status;
3210
3211 //
3212 // Check if this is is system-mapped
3213 //
3214 if (MapType & MAP_SYSTEM)
3215 {
3216 //
3217 // Check for required privilege
3218 //
3219 if (!SeSinglePrivilegeCheck(SeLockMemoryPrivilege, PreviousMode))
3220 {
3221 //
3222 // Fail: Don't have it
3223 //
3224 ObDereferenceObject(Process);
3225 return STATUS_PRIVILEGE_NOT_HELD;
3226 }
3227 }
3228
3229 //
3230 // Check if we should attach
3231 //
3232 if (CurrentProcess != Process)
3233 {
3234 //
3235 // Do it
3236 //
3237 KeStackAttachProcess(&Process->Pcb, &ApcState);
3238 Attached = TRUE;
3239 }
3240
3241 //
3242 // Call the internal function
3243 //
3244 Status = MiLockVirtualMemory(&CapturedBaseAddress,
3245 &CapturedBytesToLock,
3246 MapType);
3247
3248 //
3249 // Detach if needed
3250 //
3251 if (Attached) KeUnstackDetachProcess(&ApcState);
3252
3253 //
3254 // Release reference
3255 //
3256 ObDereferenceObject(Process);
3257
3258 //
3259 // Enter SEH to return data
3260 //
3261 _SEH2_TRY
3262 {
3263 //
3264 // Return data to user
3265 //
3266 *BaseAddress = CapturedBaseAddress;
3267 *NumberOfBytesToLock = CapturedBytesToLock;
3268 }
3269 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3270 {
3271 //
3272 // Get exception code
3273 //
3274 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3275 }
3276 _SEH2_END;
3277
3278 //
3279 // Return status
3280 //
3281 return Status;
3282 }
3283
3284
3285 static
3286 NTSTATUS
3287 MiUnlockVirtualMemory(
3288 IN OUT PVOID *BaseAddress,
3289 IN OUT PSIZE_T RegionSize,
3290 IN ULONG MapType)
3291 {
3292 PEPROCESS CurrentProcess;
3293 PMMSUPPORT AddressSpace;
3294 PVOID EndAddress;
3295 PMMPTE PointerPte, LastPte;
3296 PMMPDE PointerPde;
3297 #if (_MI_PAGING_LEVELS >= 3)
3298 PMMPDE PointerPpe;
3299 #endif
3300 #if (_MI_PAGING_LEVELS == 4)
3301 PMMPDE PointerPxe;
3302 #endif
3303 PMMPFN Pfn1;
3304 NTSTATUS Status;
3305
3306 /* Lock the address space */
3307 AddressSpace = MmGetCurrentAddressSpace();
3308 MmLockAddressSpace(AddressSpace);
3309
3310 /* Make sure we still have an address space */
3311 CurrentProcess = PsGetCurrentProcess();
3312 if (CurrentProcess->VmDeleted)
3313 {
3314 Status = STATUS_PROCESS_IS_TERMINATING;
3315 goto Cleanup;
3316 }
3317
3318 /* Check the VADs in the requested range */
3319 Status = MiCheckVadsForLockOperation(BaseAddress, RegionSize, &EndAddress);
3320
3321 /* Note: only bail out, if we hit an area without a VAD. If we hit an
3322 incompatible VAD we continue, like Windows does */
3323 if (Status == STATUS_ACCESS_VIOLATION)
3324 {
3325 Status = STATUS_NOT_LOCKED;
3326 goto Cleanup;
3327 }
3328
3329 /* Get the PTE and PDE */
3330 PointerPte = MiAddressToPte(*BaseAddress);
3331 PointerPde = MiAddressToPde(*BaseAddress);
3332 #if (_MI_PAGING_LEVELS >= 3)
3333 PointerPpe = MiAddressToPpe(*BaseAddress);
3334 #endif
3335 #if (_MI_PAGING_LEVELS == 4)
3336 PointerPxe = MiAddressToPxe(*BaseAddress);
3337 #endif
3338
3339 /* Get the last PTE */
3340 LastPte = MiAddressToPte((PVOID)((ULONG_PTR)EndAddress - 1));
3341
3342 /* Lock the process working set */
3343 MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3344
3345 /* Loop the pages */
3346 do
3347 {
3348 /* Check for a page that is not present */
3349 if (
3350 #if (_MI_PAGING_LEVELS == 4)
3351 (PointerPxe->u.Hard.Valid == 0) ||
3352 #endif
3353 #if (_MI_PAGING_LEVELS >= 3)
3354 (PointerPpe->u.Hard.Valid == 0) ||
3355 #endif
3356 (PointerPde->u.Hard.Valid == 0) ||
3357 (PointerPte->u.Hard.Valid == 0))
3358 {
3359 /* Remember it, but keep going */
3360 Status = STATUS_NOT_LOCKED;
3361 }
3362 else
3363 {
3364 /* Get the PFN */
3365 Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
3366 ASSERT(Pfn1 != NULL);
3367
3368 /* Check if all of the requested locks are present */
3369 if (((MapType & MAP_SYSTEM) && !MI_IS_LOCKED_VA(Pfn1, MAP_SYSTEM)) ||
3370 ((MapType & MAP_PROCESS) && !MI_IS_LOCKED_VA(Pfn1, MAP_PROCESS)))
3371 {
3372 /* Remember it, but keep going */
3373 Status = STATUS_NOT_LOCKED;
3374
3375 /* Check if no lock is present */
3376 if (!MI_IS_LOCKED_VA(Pfn1, MAP_PROCESS | MAP_SYSTEM))
3377 {
3378 DPRINT1("FIXME: Should remove the page from WS\n");
3379 }
3380 }
3381 }
3382
3383 /* Go to the next PTE */
3384 PointerPte++;
3385
3386 /* Check if we're on a PDE boundary */
3387 if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
3388 #if (_MI_PAGING_LEVELS >= 3)
3389 if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
3390 #endif
3391 #if (_MI_PAGING_LEVELS == 4)
3392 if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
3393 #endif
3394 } while (PointerPte <= LastPte);
3395
3396 /* Check if we hit a page that was not locked */
3397 if (Status == STATUS_NOT_LOCKED)
3398 {
3399 goto CleanupWithWsLock;
3400 }
3401
3402 /* All pages in the region were locked, so unlock them all */
3403
3404 /* Get the PTE and PDE */
3405 PointerPte = MiAddressToPte(*BaseAddress);
3406 PointerPde = MiAddressToPde(*BaseAddress);
3407 #if (_MI_PAGING_LEVELS >= 3)
3408 PointerPpe = MiAddressToPpe(*BaseAddress);
3409 #endif
3410 #if (_MI_PAGING_LEVELS == 4)
3411 PointerPxe = MiAddressToPxe(*BaseAddress);
3412 #endif
3413
3414 /* Loop the pages */
3415 do
3416 {
3417 /* Unlock it */
3418 Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
3419 MI_UNLOCK_VA(Pfn1, MapType);
3420
3421 /* Go to the next PTE */
3422 PointerPte++;
3423
3424 /* Check if we're on a PDE boundary */
3425 if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
3426 #if (_MI_PAGING_LEVELS >= 3)
3427 if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
3428 #endif
3429 #if (_MI_PAGING_LEVELS == 4)
3430 if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
3431 #endif
3432 } while (PointerPte <= LastPte);
3433
3434 /* Everything is done */
3435 Status = STATUS_SUCCESS;
3436
3437 CleanupWithWsLock:
3438
3439 /* Release process working set */
3440 MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
3441
3442 Cleanup:
3443 /* Unlock address space */
3444 MmUnlockAddressSpace(AddressSpace);
3445
3446 return Status;
3447 }
3448
3449
3450 NTSTATUS
3451 NTAPI
3452 NtUnlockVirtualMemory(IN HANDLE ProcessHandle,
3453 IN OUT PVOID *BaseAddress,
3454 IN OUT PSIZE_T NumberOfBytesToUnlock,
3455 IN ULONG MapType)
3456 {
3457 PEPROCESS Process;
3458 PEPROCESS CurrentProcess = PsGetCurrentProcess();
3459 NTSTATUS Status;
3460 BOOLEAN Attached = FALSE;
3461 KAPC_STATE ApcState;
3462 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
3463 PVOID CapturedBaseAddress;
3464 SIZE_T CapturedBytesToUnlock;
3465 PAGED_CODE();
3466
3467 //
3468 // Validate flags
3469 //
3470 if ((MapType & ~(MAP_PROCESS | MAP_SYSTEM)))
3471 {
3472 //
3473 // Invalid set of flags
3474 //
3475 return STATUS_INVALID_PARAMETER;
3476 }
3477
3478 //
3479 // At least one flag must be specified
3480 //
3481 if (!(MapType & (MAP_PROCESS | MAP_SYSTEM)))
3482 {
3483 //
3484 // No flag given
3485 //
3486 return STATUS_INVALID_PARAMETER;
3487 }
3488
3489 //
3490 // Enter SEH for probing
3491 //
3492 _SEH2_TRY
3493 {
3494 //
3495 // Validate output data
3496 //
3497 ProbeForWritePointer(BaseAddress);
3498 ProbeForWriteSize_t(NumberOfBytesToUnlock);
3499
3500 //
3501 // Capture it
3502 //
3503 CapturedBaseAddress = *BaseAddress;
3504 CapturedBytesToUnlock = *NumberOfBytesToUnlock;
3505 }
3506 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3507 {
3508 //
3509 // Get exception code
3510 //
3511 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3512 }
3513 _SEH2_END;
3514
3515 //
3516 // Catch illegal base address
3517 //
3518 if (CapturedBaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER;
3519
3520 //
3521 // Catch illegal region size
3522 //
3523 if ((MmUserProbeAddress - (ULONG_PTR)CapturedBaseAddress) < CapturedBytesToUnlock)
3524 {
3525 //
3526 // Fail
3527 //
3528 return STATUS_INVALID_PARAMETER;
3529 }
3530
3531 //
3532 // 0 is also illegal
3533 //
3534 if (!CapturedBytesToUnlock) return STATUS_INVALID_PARAMETER;
3535
3536 //
3537 // Get a reference to the process
3538 //
3539 Status = ObReferenceObjectByHandle(ProcessHandle,
3540 PROCESS_VM_OPERATION,
3541 PsProcessType,
3542 PreviousMode,
3543 (PVOID*)(&Process),
3544 NULL);
3545 if (!NT_SUCCESS(Status)) return Status;
3546
3547 //
3548 // Check if this is is system-mapped
3549 //
3550 if (MapType & MAP_SYSTEM)
3551 {
3552 //
3553 // Check for required privilege
3554 //
3555 if (!SeSinglePrivilegeCheck(SeLockMemoryPrivilege, PreviousMode))
3556 {
3557 //
3558 // Fail: Don't have it
3559 //
3560 ObDereferenceObject(Process);
3561 return STATUS_PRIVILEGE_NOT_HELD;
3562 }
3563 }
3564
3565 //
3566 // Check if we should attach
3567 //
3568 if (CurrentProcess != Process)
3569 {
3570 //
3571 // Do it
3572 //
3573 KeStackAttachProcess(&Process->Pcb, &ApcState);
3574 Attached = TRUE;
3575 }
3576
3577 //
3578 // Call the internal function
3579 //
3580 Status = MiUnlockVirtualMemory(&CapturedBaseAddress,
3581 &CapturedBytesToUnlock,
3582 MapType);
3583
3584 //
3585 // Detach if needed
3586 //
3587 if (Attached) KeUnstackDetachProcess(&ApcState);
3588
3589 //
3590 // Release reference
3591 //
3592 ObDereferenceObject(Process);
3593
3594 //
3595 // Enter SEH to return data
3596 //
3597 _SEH2_TRY
3598 {
3599 //
3600 // Return data to user
3601 //
3602 *BaseAddress = CapturedBaseAddress;
3603 *NumberOfBytesToUnlock = CapturedBytesToUnlock;
3604 }
3605 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3606 {
3607 //
3608 // Get exception code
3609 //
3610 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3611 }
3612 _SEH2_END;
3613
3614 //
3615 // Return status
3616 //
3617 return STATUS_SUCCESS;
3618 }
3619
3620 NTSTATUS
3621 NTAPI
3622 NtFlushVirtualMemory(IN HANDLE ProcessHandle,
3623 IN OUT PVOID *BaseAddress,
3624 IN OUT PSIZE_T NumberOfBytesToFlush,
3625 OUT PIO_STATUS_BLOCK IoStatusBlock)
3626 {
3627 PEPROCESS Process;
3628 NTSTATUS Status;
3629 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
3630 PVOID CapturedBaseAddress;
3631 SIZE_T CapturedBytesToFlush;
3632 IO_STATUS_BLOCK LocalStatusBlock;
3633 PAGED_CODE();
3634
3635 //
3636 // Check if we came from user mode
3637 //
3638 if (PreviousMode != KernelMode)
3639 {
3640 //
3641 // Enter SEH for probing
3642 //
3643 _SEH2_TRY
3644 {
3645 //
3646 // Validate all outputs
3647 //
3648 ProbeForWritePointer(BaseAddress);
3649 ProbeForWriteSize_t(NumberOfBytesToFlush);
3650 ProbeForWriteIoStatusBlock(IoStatusBlock);
3651
3652 //
3653 // Capture them
3654 //
3655 CapturedBaseAddress = *BaseAddress;
3656 CapturedBytesToFlush = *NumberOfBytesToFlush;
3657 }
3658 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3659 {
3660 //
3661 // Get exception code
3662 //
3663 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3664 }
3665 _SEH2_END;
3666 }
3667 else
3668 {
3669 //
3670 // Capture directly
3671 //
3672 CapturedBaseAddress = *BaseAddress;
3673 CapturedBytesToFlush = *NumberOfBytesToFlush;
3674 }
3675
3676 //
3677 // Catch illegal base address
3678 //
3679 if (CapturedBaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER;
3680
3681 //
3682 // Catch illegal region size
3683 //
3684 if ((MmUserProbeAddress - (ULONG_PTR)CapturedBaseAddress) < CapturedBytesToFlush)
3685 {
3686 //
3687 // Fail
3688 //
3689 return STATUS_INVALID_PARAMETER;
3690 }
3691
3692 //
3693 // Get a reference to the process
3694 //
3695 Status = ObReferenceObjectByHandle(ProcessHandle,
3696 PROCESS_VM_OPERATION,
3697 PsProcessType,
3698 PreviousMode,
3699 (PVOID*)(&Process),
3700 NULL);
3701 if (!NT_SUCCESS(Status)) return Status;
3702
3703 //
3704 // Do it
3705 //
3706 Status = MmFlushVirtualMemory(Process,
3707 &CapturedBaseAddress,
3708 &CapturedBytesToFlush,
3709 &LocalStatusBlock);
3710
3711 //
3712 // Release reference
3713 //
3714 ObDereferenceObject(Process);
3715
3716 //
3717 // Enter SEH to return data
3718 //
3719 _SEH2_TRY
3720 {
3721 //
3722 // Return data to user
3723 //
3724 *BaseAddress = PAGE_ALIGN(CapturedBaseAddress);
3725 *NumberOfBytesToFlush = 0;
3726 *IoStatusBlock = LocalStatusBlock;
3727 }
3728 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3729 {
3730 }
3731 _SEH2_END;
3732
3733 //
3734 // Return status
3735 //
3736 return Status;
3737 }
3738
3739 /*
3740 * @unimplemented
3741 */
3742 NTSTATUS
3743 NTAPI
3744 NtGetWriteWatch(IN HANDLE ProcessHandle,
3745 IN ULONG Flags,
3746 IN PVOID BaseAddress,
3747 IN SIZE_T RegionSize,
3748 IN PVOID *UserAddressArray,
3749 OUT PULONG_PTR EntriesInUserAddressArray,
3750 OUT PULONG Granularity)
3751 {
3752 PEPROCESS Process;
3753 NTSTATUS Status;
3754 PVOID EndAddress;
3755 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
3756 ULONG_PTR CapturedEntryCount;
3757 PAGED_CODE();
3758
3759 //
3760 // Check if we came from user mode
3761 //
3762 if (PreviousMode != KernelMode)
3763 {
3764 //
3765 // Enter SEH for probing
3766 //
3767 _SEH2_TRY
3768 {
3769 //
3770 // Catch illegal base address
3771 //
3772 if (BaseAddress > MM_HIGHEST_USER_ADDRESS) _SEH2_YIELD(return STATUS_INVALID_PARAMETER_2);
3773
3774 //
3775 // Catch illegal region size
3776 //
3777 if ((MmUserProbeAddress - (ULONG_PTR)BaseAddress) < RegionSize)
3778 {
3779 //
3780 // Fail
3781 //
3782 _SEH2_YIELD(return STATUS_INVALID_PARAMETER_3);
3783 }
3784
3785 //
3786 // Validate all data
3787 //
3788 ProbeForWriteSize_t(EntriesInUserAddressArray);
3789 ProbeForWriteUlong(Granularity);
3790
3791 //
3792 // Capture them
3793 //
3794 CapturedEntryCount = *EntriesInUserAddressArray;
3795
3796 //
3797 // Must have a count
3798 //
3799 if (CapturedEntryCount == 0) _SEH2_YIELD(return STATUS_INVALID_PARAMETER_5);
3800
3801 //
3802 // Can't be larger than the maximum
3803 //
3804 if (CapturedEntryCount > (MAXULONG_PTR / sizeof(ULONG_PTR)))
3805 {
3806 //
3807 // Fail
3808 //
3809 _SEH2_YIELD(return STATUS_INVALID_PARAMETER_5);
3810 }
3811
3812 //
3813 // Probe the actual array
3814 //
3815 ProbeForWrite(UserAddressArray,
3816 CapturedEntryCount * sizeof(PVOID),
3817 sizeof(PVOID));
3818 }
3819 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3820 {
3821 //
3822 // Get exception code
3823 //
3824 _SEH2_YIELD(return _SEH2_GetExceptionCode());
3825 }
3826 _SEH2_END;
3827 }
3828 else
3829 {
3830 //
3831 // Capture directly
3832 //
3833 CapturedEntryCount = *EntriesInUserAddressArray;
3834 ASSERT(CapturedEntryCount != 0);
3835 }
3836
3837 //
3838 // Check if this is a local request
3839 //
3840 if (ProcessHandle == NtCurrentProcess())
3841 {
3842 //
3843 // No need to reference the process
3844 //
3845 Process = PsGetCurrentProcess();
3846 }
3847 else
3848 {
3849 //
3850 // Reference the target
3851 //
3852 Status = ObReferenceObjectByHandle(ProcessHandle,
3853 PROCESS_VM_OPERATION,
3854 PsProcessType,
3855 PreviousMode,
3856 (PVOID *)&Process,
3857 NULL);
3858 if (!NT_SUCCESS(Status)) return Status;
3859 }
3860
3861 //
3862 // Compute the last address and validate it
3863 //
3864 EndAddress = (PVOID)((ULONG_PTR)BaseAddress + RegionSize - 1);
3865 if (BaseAddress > EndAddress)
3866 {
3867 //
3868 // Fail
3869 //
3870 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
3871 return STATUS_INVALID_PARAMETER_4;
3872 }
3873
3874 //
3875 // Oops :(
3876 //
3877 UNIMPLEMENTED;
3878
3879 //
3880 // Dereference if needed
3881 //
3882 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
3883
3884 //
3885 // Enter SEH to return data
3886 //
3887 _SEH2_TRY
3888 {
3889 //
3890 // Return data to user
3891 //
3892 *EntriesInUserAddressArray = 0;
3893 *Granularity = PAGE_SIZE;
3894 }
3895 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
3896 {
3897 //
3898 // Get exception code
3899 //
3900 Status = _SEH2_GetExceptionCode();
3901 }
3902 _SEH2_END;
3903
3904 //
3905 // Return success
3906 //
3907 return STATUS_SUCCESS;
3908 }
3909
3910 /*
3911 * @unimplemented
3912 */
3913 NTSTATUS
3914 NTAPI
3915 NtResetWriteWatch(IN HANDLE ProcessHandle,
3916 IN PVOID BaseAddress,
3917 IN SIZE_T RegionSize)
3918 {
3919 PVOID EndAddress;
3920 PEPROCESS Process;
3921 NTSTATUS Status;
3922 KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
3923 ASSERT (KeGetCurrentIrql() == PASSIVE_LEVEL);
3924
3925 //
3926 // Catch illegal base address
3927 //
3928 if (BaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER_2;
3929
3930 //
3931 // Catch illegal region size
3932 //
3933 if ((MmUserProbeAddress - (ULONG_PTR)BaseAddress) < RegionSize)
3934 {
3935 //
3936 // Fail
3937 //
3938 return STATUS_INVALID_PARAMETER_3;
3939 }
3940
3941 //
3942 // Check if this is a local request
3943 //
3944 if (ProcessHandle == NtCurrentProcess())
3945 {
3946 //
3947 // No need to reference the process
3948 //
3949 Process = PsGetCurrentProcess();
3950 }
3951 else
3952 {
3953 //
3954 // Reference the target
3955 //
3956 Status = ObReferenceObjectByHandle(ProcessHandle,
3957 PROCESS_VM_OPERATION,
3958 PsProcessType,
3959 PreviousMode,
3960 (PVOID *)&Process,
3961 NULL);
3962 if (!NT_SUCCESS(Status)) return Status;
3963 }
3964
3965 //
3966 // Compute the last address and validate it
3967 //
3968 EndAddress = (PVOID)((ULONG_PTR)BaseAddress + RegionSize - 1);
3969 if (BaseAddress > EndAddress)
3970 {
3971 //
3972 // Fail
3973 //
3974 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
3975 return STATUS_INVALID_PARAMETER_3;
3976 }
3977
3978 //
3979 // Oops :(
3980 //
3981 UNIMPLEMENTED;
3982
3983 //
3984 // Dereference if needed
3985 //
3986 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
3987
3988 //
3989 // Return success
3990 //
3991 return STATUS_SUCCESS;
3992 }
3993
3994 NTSTATUS
3995 NTAPI
3996 NtQueryVirtualMemory(IN HANDLE ProcessHandle,
3997 IN PVOID BaseAddress,
3998 IN MEMORY_INFORMATION_CLASS MemoryInformationClass,
3999 OUT PVOID MemoryInformation,
4000 IN SIZE_T MemoryInformationLength,
4001 OUT PSIZE_T ReturnLength)
4002 {
4003 NTSTATUS Status = STATUS_SUCCESS;
4004 KPROCESSOR_MODE PreviousMode;
4005
4006 DPRINT("Querying class %d about address: %p\n", MemoryInformationClass, BaseAddress);
4007
4008 /* Bail out if the address is invalid */
4009 if (BaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER;
4010
4011 /* Probe return buffer */
4012 PreviousMode = ExGetPreviousMode();
4013 if (PreviousMode != KernelMode)
4014 {
4015 _SEH2_TRY
4016 {
4017 ProbeForWrite(MemoryInformation,
4018 MemoryInformationLength,
4019 sizeof(ULONG_PTR));
4020
4021 if (ReturnLength) ProbeForWriteSize_t(ReturnLength);
4022 }
4023 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4024 {
4025 Status = _SEH2_GetExceptionCode();
4026 }
4027 _SEH2_END;
4028
4029 if (!NT_SUCCESS(Status))
4030 {
4031 return Status;
4032 }
4033 }
4034
4035 switch(MemoryInformationClass)
4036 {
4037 case MemoryBasicInformation:
4038 /* Validate the size information of the class */
4039 if (MemoryInformationLength < sizeof(MEMORY_BASIC_INFORMATION))
4040 {
4041 /* The size is invalid */
4042 return STATUS_INFO_LENGTH_MISMATCH;
4043 }
4044 Status = MiQueryMemoryBasicInformation(ProcessHandle,
4045 BaseAddress,
4046 MemoryInformation,
4047 MemoryInformationLength,
4048 ReturnLength);
4049 break;
4050
4051 case MemorySectionName:
4052 /* Validate the size information of the class */
4053 if (MemoryInformationLength < sizeof(MEMORY_SECTION_NAME))
4054 {
4055 /* The size is invalid */
4056 return STATUS_INFO_LENGTH_MISMATCH;
4057 }
4058 Status = MiQueryMemorySectionName(ProcessHandle,
4059 BaseAddress,
4060 MemoryInformation,
4061 MemoryInformationLength,
4062 ReturnLength);
4063 break;
4064 case MemoryWorkingSetList:
4065 case MemoryBasicVlmInformation:
4066 default:
4067 DPRINT1("Unhandled memory information class %d\n", MemoryInformationClass);
4068 break;
4069 }
4070
4071 return Status;
4072 }
4073
4074 /*
4075 * @implemented
4076 */
4077 NTSTATUS
4078 NTAPI
4079 NtAllocateVirtualMemory(IN HANDLE ProcessHandle,
4080 IN OUT PVOID* UBaseAddress,
4081 IN ULONG_PTR ZeroBits,
4082 IN OUT PSIZE_T URegionSize,
4083 IN ULONG AllocationType,
4084 IN ULONG Protect)
4085 {
4086 PEPROCESS Process;
4087 PMEMORY_AREA MemoryArea;
4088 PFN_NUMBER PageCount;
4089 PMMVAD Vad, FoundVad;
4090 NTSTATUS Status;
4091 PMMSUPPORT AddressSpace;
4092 PVOID PBaseAddress;
4093 ULONG_PTR PRegionSize, StartingAddress, EndingAddress;
4094 PEPROCESS CurrentProcess = PsGetCurrentProcess();
4095 KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
4096 PETHREAD CurrentThread = PsGetCurrentThread();
4097 KAPC_STATE ApcState;
4098 ULONG ProtectionMask, QuotaCharge = 0, QuotaFree = 0;
4099 BOOLEAN Attached = FALSE, ChangeProtection = FALSE;
4100 MMPTE TempPte;
4101 PMMPTE PointerPte, PointerPde, LastPte;
4102 PAGED_CODE();
4103
4104 /* Check for valid Zero bits */
4105 if (ZeroBits > 21)
4106 {
4107 DPRINT1("Too many zero bits\n");
4108 return STATUS_INVALID_PARAMETER_3;
4109 }
4110
4111 /* Check for valid Allocation Types */
4112 if ((AllocationType & ~(MEM_COMMIT | MEM_RESERVE | MEM_RESET | MEM_PHYSICAL |
4113 MEM_TOP_DOWN | MEM_WRITE_WATCH)))
4114 {
4115 DPRINT1("Invalid Allocation Type\n");
4116 return STATUS_INVALID_PARAMETER_5;
4117 }
4118
4119 /* Check for at least one of these Allocation Types to be set */
4120 if (!(AllocationType & (MEM_COMMIT | MEM_RESERVE | MEM_RESET)))
4121 {
4122 DPRINT1("No memory allocation base type\n");
4123 return STATUS_INVALID_PARAMETER_5;
4124 }
4125
4126 /* MEM_RESET is an exclusive flag, make sure that is valid too */
4127 if ((AllocationType & MEM_RESET) && (AllocationType != MEM_RESET))
4128 {
4129 DPRINT1("Invalid use of MEM_RESET\n");
4130 return STATUS_INVALID_PARAMETER_5;
4131 }
4132
4133 /* Check if large pages are being used */
4134 if (AllocationType & MEM_LARGE_PAGES)
4135 {
4136 /* Large page allocations MUST be committed */
4137 if (!(AllocationType & MEM_COMMIT))
4138 {
4139 DPRINT1("Must supply MEM_COMMIT with MEM_LARGE_PAGES\n");
4140 return STATUS_INVALID_PARAMETER_5;
4141 }
4142
4143 /* These flags are not allowed with large page allocations */
4144 if (AllocationType & (MEM_PHYSICAL | MEM_RESET | MEM_WRITE_WATCH))
4145 {
4146 DPRINT1("Using illegal flags with MEM_LARGE_PAGES\n");
4147 return STATUS_INVALID_PARAMETER_5;
4148 }
4149 }
4150
4151 /* MEM_WRITE_WATCH can only be used if MEM_RESERVE is also used */
4152 if ((AllocationType & MEM_WRITE_WATCH) && !(AllocationType & MEM_RESERVE))
4153 {
4154 DPRINT1("MEM_WRITE_WATCH used without MEM_RESERVE\n");
4155 return STATUS_INVALID_PARAMETER_5;
4156 }
4157
4158 /* MEM_PHYSICAL can only be used if MEM_RESERVE is also used */
4159 if ((AllocationType & MEM_PHYSICAL) && !(AllocationType & MEM_RESERVE))
4160 {
4161 DPRINT1("MEM_WRITE_WATCH used without MEM_RESERVE\n");
4162 return STATUS_INVALID_PARAMETER_5;
4163 }
4164
4165 /* Check for valid MEM_PHYSICAL usage */
4166 if (AllocationType & MEM_PHYSICAL)
4167 {
4168 /* Only these flags are allowed with MEM_PHYSIAL */
4169 if (AllocationType & ~(MEM_RESERVE | MEM_TOP_DOWN | MEM_PHYSICAL))
4170 {
4171 DPRINT1("Using illegal flags with MEM_PHYSICAL\n");
4172 return STATUS_INVALID_PARAMETER_5;
4173 }
4174
4175 /* Then make sure PAGE_READWRITE is used */
4176 if (Protect != PAGE_READWRITE)
4177 {
4178 DPRINT1("MEM_PHYSICAL used without PAGE_READWRITE\n");
4179 return STATUS_INVALID_PARAMETER_6;
4180 }
4181 }
4182
4183 /* Calculate the protection mask and make sure it's valid */
4184 ProtectionMask = MiMakeProtectionMask(Protect);
4185 if (ProtectionMask == MM_INVALID_PROTECTION)
4186 {
4187 DPRINT1("Invalid protection mask\n");
4188 return STATUS_INVALID_PAGE_PROTECTION;
4189 }
4190
4191 /* Enter SEH */
4192 _SEH2_TRY
4193 {
4194 /* Check for user-mode parameters */
4195 if (PreviousMode != KernelMode)
4196 {
4197 /* Make sure they are writable */
4198 ProbeForWritePointer(UBaseAddress);
4199 ProbeForWriteUlong(URegionSize);
4200 }
4201
4202 /* Capture their values */
4203 PBaseAddress = *UBaseAddress;
4204 PRegionSize = *URegionSize;
4205 }
4206 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4207 {
4208 /* Return the exception code */
4209 _SEH2_YIELD(return _SEH2_GetExceptionCode());
4210 }
4211 _SEH2_END;
4212
4213 /* Make sure the allocation isn't past the VAD area */
4214 if (PBaseAddress >= MM_HIGHEST_VAD_ADDRESS)
4215 {
4216 DPRINT1("Virtual allocation base above User Space\n");
4217 return STATUS_INVALID_PARAMETER_2;
4218 }
4219
4220 /* Make sure the allocation wouldn't overflow past the VAD area */
4221 if ((((ULONG_PTR)MM_HIGHEST_VAD_ADDRESS + 1) - (ULONG_PTR)PBaseAddress) < PRegionSize)
4222 {
4223 DPRINT1("Region size would overflow into kernel-memory\n");
4224 return STATUS_INVALID_PARAMETER_4;
4225 }
4226
4227 /* Make sure there's a size specified */
4228 if (!PRegionSize)
4229 {
4230 DPRINT1("Region size is invalid (zero)\n");
4231 return STATUS_INVALID_PARAMETER_4;
4232 }
4233
4234 //
4235 // If this is for the current process, just use PsGetCurrentProcess
4236 //
4237 if (ProcessHandle == NtCurrentProcess())
4238 {
4239 Process = CurrentProcess;
4240 }
4241 else
4242 {
4243 //
4244 // Otherwise, reference the process with VM rights and attach to it if
4245 // this isn't the current process. We must attach because we'll be touching
4246 // PTEs and PDEs that belong to user-mode memory, and also touching the
4247 // Working Set which is stored in Hyperspace.
4248 //
4249 Status = ObReferenceObjectByHandle(ProcessHandle,
4250 PROCESS_VM_OPERATION,
4251 PsProcessType,
4252 PreviousMode,
4253 (PVOID*)&Process,
4254 NULL);
4255 if (!NT_SUCCESS(Status)) return Status;
4256 if (CurrentProcess != Process)
4257 {
4258 KeStackAttachProcess(&Process->Pcb, &ApcState);
4259 Attached = TRUE;
4260 }
4261 }
4262
4263 //
4264 // Check for large page allocations and make sure that the required privilege
4265 // is being held, before attempting to handle them.
4266 //
4267 if ((AllocationType & MEM_LARGE_PAGES) &&
4268 !(SeSinglePrivilegeCheck(SeLockMemoryPrivilege, PreviousMode)))
4269 {
4270 /* Fail without it */
4271 DPRINT1("Privilege not held for MEM_LARGE_PAGES\n");
4272 Status = STATUS_PRIVILEGE_NOT_HELD;
4273 goto FailPathNoLock;
4274 }
4275
4276 //
4277 // Fail on the things we don't yet support
4278 //
4279 if (ZeroBits != 0)
4280 {
4281 DPRINT1("Zero bits not supported\n");
4282 Status = STATUS_INVALID_PARAMETER;
4283 goto FailPathNoLock;
4284 }
4285 if ((AllocationType & MEM_LARGE_PAGES) == MEM_LARGE_PAGES)
4286 {
4287 DPRINT1("MEM_LARGE_PAGES not supported\n");
4288 Status = STATUS_INVALID_PARAMETER;
4289 goto FailPathNoLock;
4290 }
4291 if ((AllocationType & MEM_PHYSICAL) == MEM_PHYSICAL)
4292 {
4293 DPRINT1("MEM_PHYSICAL not supported\n");
4294 Status = STATUS_INVALID_PARAMETER;
4295 goto FailPathNoLock;
4296 }
4297 if ((AllocationType & MEM_WRITE_WATCH) == MEM_WRITE_WATCH)
4298 {
4299 DPRINT1("MEM_WRITE_WATCH not supported\n");
4300 Status = STATUS_INVALID_PARAMETER;
4301 goto FailPathNoLock;
4302 }
4303 if ((AllocationType & MEM_TOP_DOWN) == MEM_TOP_DOWN)
4304 {
4305 DPRINT1("MEM_TOP_DOWN not supported\n");
4306 AllocationType &= ~MEM_TOP_DOWN;
4307 }
4308
4309 if (Process->VmTopDown == 1)
4310 {
4311 DPRINT1("VmTopDown not supported\n");
4312 Status = STATUS_INVALID_PARAMETER;
4313 goto FailPathNoLock;
4314 }
4315
4316 //
4317 // Check if the caller is reserving memory, or committing memory and letting
4318 // us pick the base address
4319 //
4320 if (!(PBaseAddress) || (AllocationType & MEM_RESERVE))
4321 {
4322 //
4323 // Do not allow COPY_ON_WRITE through this API
4324 //
4325 if ((Protect & PAGE_WRITECOPY) || (Protect & PAGE_EXECUTE_WRITECOPY))
4326 {
4327 DPRINT1("Copy on write not allowed through this path\n");
4328 Status = STATUS_INVALID_PAGE_PROTECTION;
4329 goto FailPathNoLock;
4330 }
4331
4332 //
4333 // Does the caller have an address in mind, or is this a blind commit?
4334 //
4335 if (!PBaseAddress)
4336 {
4337 //
4338 // This is a blind commit, all we need is the region size
4339 //
4340 PRegionSize = ROUND_TO_PAGES(PRegionSize);
4341 PageCount = BYTES_TO_PAGES(PRegionSize);
4342 EndingAddress = 0;
4343 StartingAddress = 0;
4344 }
4345 else
4346 {
4347 //
4348 // This is a reservation, so compute the starting address on the
4349 // expected 64KB granularity, and see where the ending address will
4350 // fall based on the aligned address and the passed in region size
4351 //
4352 StartingAddress = ROUND_DOWN((ULONG_PTR)PBaseAddress, _64K);
4353 EndingAddress = ((ULONG_PTR)PBaseAddress + PRegionSize - 1) | (PAGE_SIZE - 1);
4354 PageCount = BYTES_TO_PAGES(EndingAddress - StartingAddress);
4355 }
4356
4357 //
4358 // Allocate and initialize the VAD
4359 //
4360 Vad = ExAllocatePoolWithTag(NonPagedPool, sizeof(MMVAD_LONG), 'SdaV');
4361 ASSERT(Vad != NULL);
4362 Vad->u.LongFlags = 0;
4363 if (AllocationType & MEM_COMMIT) Vad->u.VadFlags.MemCommit = 1;
4364 Vad->u.VadFlags.Protection = ProtectionMask;
4365 Vad->u.VadFlags.PrivateMemory = 1;
4366 Vad->u.VadFlags.CommitCharge = AllocationType & MEM_COMMIT ? PageCount : 0;
4367
4368 //
4369 // Lock the address space and make sure the process isn't already dead
4370 //
4371 AddressSpace = MmGetCurrentAddressSpace();
4372 MmLockAddressSpace(AddressSpace);
4373 if (Process->VmDeleted)
4374 {
4375 Status = STATUS_PROCESS_IS_TERMINATING;
4376 goto FailPath;
4377 }
4378
4379 //
4380 // Did we have a base address? If no, find a valid address that is 64KB
4381 // aligned in the VAD tree. Otherwise, make sure that the address range
4382 // which was passed in isn't already conflicting with an existing address
4383 // range.
4384 //
4385 if (!PBaseAddress)
4386 {
4387 Status = MiFindEmptyAddressRangeInTree(PRegionSize,
4388 _64K,
4389 &Process->VadRoot,
4390 (PMMADDRESS_NODE*)&Process->VadFreeHint,
4391 &StartingAddress);
4392 if (!NT_SUCCESS(Status)) goto FailPath;
4393
4394 //
4395 // Now we know where the allocation ends. Make sure it doesn't end up
4396 // somewhere in kernel mode.
4397 //
4398 EndingAddress = ((ULONG_PTR)StartingAddress + PRegionSize - 1) | (PAGE_SIZE - 1);
4399 if ((PVOID)EndingAddress > MM_HIGHEST_VAD_ADDRESS)
4400 {
4401 Status = STATUS_NO_MEMORY;
4402 goto FailPath;
4403 }
4404 }
4405 else if (MiCheckForConflictingNode(StartingAddress >> PAGE_SHIFT,
4406 EndingAddress >> PAGE_SHIFT,
4407 &Process->VadRoot))
4408 {
4409 //
4410 // The address specified is in conflict!
4411 //
4412 Status = STATUS_CONFLICTING_ADDRESSES;
4413 goto FailPath;
4414 }
4415
4416 //
4417 // Write out the VAD fields for this allocation
4418 //
4419 Vad->StartingVpn = (ULONG_PTR)StartingAddress >> PAGE_SHIFT;
4420 Vad->EndingVpn = (ULONG_PTR)EndingAddress >> PAGE_SHIFT;
4421
4422 //
4423 // FIXME: Should setup VAD bitmap
4424 //
4425 Status = STATUS_SUCCESS;
4426
4427 //
4428 // Lock the working set and insert the VAD into the process VAD tree
4429 //
4430 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
4431 Vad->ControlArea = NULL; // For Memory-Area hack
4432 MiInsertVad(Vad, Process);
4433 MiUnlockProcessWorkingSetUnsafe(Process, CurrentThread);
4434
4435 //
4436 // Update the virtual size of the process, and if this is now the highest
4437 // virtual size we have ever seen, update the peak virtual size to reflect
4438 // this.
4439 //
4440 Process->VirtualSize += PRegionSize;
4441 if (Process->VirtualSize > Process->PeakVirtualSize)
4442 {
4443 Process->PeakVirtualSize = Process->VirtualSize;
4444 }
4445
4446 //
4447 // Release address space and detach and dereference the target process if
4448 // it was different from the current process
4449 //
4450 MmUnlockAddressSpace(AddressSpace);
4451 if (Attached) KeUnstackDetachProcess(&ApcState);
4452 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
4453
4454 //
4455 // Use SEH to write back the base address and the region size. In the case
4456 // of an exception, we do not return back the exception code, as the memory
4457 // *has* been allocated. The caller would now have to call VirtualQuery
4458 // or do some other similar trick to actually find out where its memory
4459 // allocation ended up
4460 //
4461 _SEH2_TRY
4462 {
4463 *URegionSize = PRegionSize;
4464 *UBaseAddress = (PVOID)StartingAddress;
4465 }
4466 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4467 {
4468 }
4469 _SEH2_END;
4470 return STATUS_SUCCESS;
4471 }
4472
4473 //
4474 // This is a MEM_COMMIT on top of an existing address which must have been
4475 // MEM_RESERVED already. Compute the start and ending base addresses based
4476 // on the user input, and then compute the actual region size once all the
4477 // alignments have been done.
4478 //
4479 StartingAddress = (ULONG_PTR)PAGE_ALIGN(PBaseAddress);
4480 EndingAddress = (((ULONG_PTR)PBaseAddress + PRegionSize - 1) | (PAGE_SIZE - 1));
4481 PRegionSize = EndingAddress - StartingAddress + 1;
4482
4483 //
4484 // Lock the address space and make sure the process isn't already dead
4485 //
4486 AddressSpace = MmGetCurrentAddressSpace();
4487 MmLockAddressSpace(AddressSpace);
4488 if (Process->VmDeleted)
4489 {
4490 DPRINT1("Process is dying\n");
4491 Status = STATUS_PROCESS_IS_TERMINATING;
4492 goto FailPath;
4493 }
4494
4495 //
4496 // Get the VAD for this address range, and make sure it exists
4497 //
4498 FoundVad = (PMMVAD)MiCheckForConflictingNode(StartingAddress >> PAGE_SHIFT,
4499 EndingAddress >> PAGE_SHIFT,
4500 &Process->VadRoot);
4501 if (!FoundVad)
4502 {
4503 DPRINT1("Could not find a VAD for this allocation\n");
4504 Status = STATUS_CONFLICTING_ADDRESSES;
4505 goto FailPath;
4506 }
4507
4508 if ((AllocationType & MEM_RESET) == MEM_RESET)
4509 {
4510 /// @todo HACK: pretend success
4511 DPRINT("MEM_RESET not supported\n");
4512 Status = STATUS_SUCCESS;
4513 goto FailPath;
4514 }
4515
4516 //
4517 // These kinds of VADs are illegal for this Windows function when trying to
4518 // commit an existing range
4519 //
4520 if ((FoundVad->u.VadFlags.VadType == VadAwe) ||
4521 (FoundVad->u.VadFlags.VadType == VadDevicePhysicalMemory) ||
4522 (FoundVad->u.VadFlags.VadType == VadLargePages))
4523 {
4524 DPRINT1("Illegal VAD for attempting a MEM_COMMIT\n");
4525 Status = STATUS_CONFLICTING_ADDRESSES;
4526 goto FailPath;
4527 }
4528
4529 //
4530 // Make sure that this address range actually fits within the VAD for it
4531 //
4532 if (((StartingAddress >> PAGE_SHIFT) < FoundVad->StartingVpn) ||
4533 ((EndingAddress >> PAGE_SHIFT) > FoundVad->EndingVpn))
4534 {
4535 DPRINT1("Address range does not fit into the VAD\n");
4536 Status = STATUS_CONFLICTING_ADDRESSES;
4537 goto FailPath;
4538 }
4539
4540 //
4541 // Make sure this is an ARM3 section
4542 //
4543 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, (PVOID)PAGE_ROUND_DOWN(PBaseAddress));
4544 if (MemoryArea->Type != MEMORY_AREA_OWNED_BY_ARM3)
4545 {
4546 DPRINT1("Illegal commit of non-ARM3 section!\n");
4547 Status = STATUS_ALREADY_COMMITTED;
4548 goto FailPath;
4549 }
4550
4551 // Is this a previously reserved section being committed? If so, enter the
4552 // special section path
4553 //
4554 if (FoundVad->u.VadFlags.PrivateMemory == FALSE)
4555 {
4556 //
4557 // You cannot commit large page sections through this API
4558 //
4559 if (FoundVad->u.VadFlags.VadType == VadLargePageSection)
4560 {
4561 DPRINT1("Large page sections cannot be VirtualAlloc'd\n");
4562 Status = STATUS_INVALID_PAGE_PROTECTION;
4563 goto FailPath;
4564 }
4565
4566 //
4567 // You can only use caching flags on a rotate VAD
4568 //
4569 if ((Protect & (PAGE_NOCACHE | PAGE_WRITECOMBINE)) &&
4570 (FoundVad->u.VadFlags.VadType != VadRotatePhysical))
4571 {
4572 DPRINT1("Cannot use caching flags with anything but rotate VADs\n");
4573 Status = STATUS_INVALID_PAGE_PROTECTION;
4574 goto FailPath;
4575 }
4576
4577 //
4578 // We should make sure that the section's permissions aren't being
4579 // messed with
4580 //
4581 if (FoundVad->u.VadFlags.NoChange)
4582 {
4583 //
4584 // Make sure it's okay to touch it
4585 //
4586 Status = MiCheckSecuredVad(FoundVad,
4587 PBaseAddress,
4588 PRegionSize,
4589 ProtectionMask);
4590 if (!NT_SUCCESS(Status))
4591 {
4592 DPRINT1("Secured VAD being messed around with\n");
4593 goto FailPath;
4594 }
4595 }
4596
4597 //
4598 // ARM3 does not support file-backed sections, only shared memory
4599 //
4600 ASSERT(FoundVad->ControlArea->FilePointer == NULL);
4601
4602 //
4603 // Rotate VADs cannot be guard pages or inaccessible, nor copy on write
4604 //
4605 if ((FoundVad->u.VadFlags.VadType == VadRotatePhysical) &&
4606 (Protect & (PAGE_WRITECOPY | PAGE_EXECUTE_WRITECOPY | PAGE_NOACCESS | PAGE_GUARD)))
4607 {
4608 DPRINT1("Invalid page protection for rotate VAD\n");
4609 Status = STATUS_INVALID_PAGE_PROTECTION;
4610 goto FailPath;
4611 }
4612
4613 //
4614 // Compute PTE addresses and the quota charge, then grab the commit lock
4615 //
4616 PointerPte = MI_GET_PROTOTYPE_PTE_FOR_VPN(FoundVad, StartingAddress >> PAGE_SHIFT);
4617 LastPte = MI_GET_PROTOTYPE_PTE_FOR_VPN(FoundVad, EndingAddress >> PAGE_SHIFT);
4618 QuotaCharge = (ULONG)(LastPte - PointerPte + 1);
4619 KeAcquireGuardedMutexUnsafe(&MmSectionCommitMutex);
4620
4621 //
4622 // Get the segment template PTE and start looping each page
4623 //
4624 TempPte = FoundVad->ControlArea->Segment->SegmentPteTemplate;
4625 ASSERT(TempPte.u.Long != 0);
4626 while (PointerPte <= LastPte)
4627 {
4628 //
4629 // For each non-already-committed page, write the invalid template PTE
4630 //
4631 if (PointerPte->u.Long == 0)
4632 {
4633 MI_WRITE_INVALID_PTE(PointerPte, TempPte);
4634 }
4635 else
4636 {
4637 QuotaFree++;
4638 }
4639 PointerPte++;
4640 }
4641
4642 //
4643 // Now do the commit accounting and release the lock
4644 //
4645 ASSERT(QuotaCharge >= QuotaFree);
4646 QuotaCharge -= QuotaFree;
4647 FoundVad->ControlArea->Segment->NumberOfCommittedPages += QuotaCharge;
4648 KeReleaseGuardedMutexUnsafe(&MmSectionCommitMutex);
4649
4650 //
4651 // We are done with committing the section pages
4652 //
4653 Status = STATUS_SUCCESS;
4654 goto FailPath;
4655 }
4656
4657 //
4658 // This is a specific ReactOS check because we only use normal VADs
4659 //
4660 ASSERT(FoundVad->u.VadFlags.VadType == VadNone);
4661
4662 //
4663 // While this is an actual Windows check
4664 //
4665 ASSERT(FoundVad->u.VadFlags.VadType != VadRotatePhysical);
4666
4667 //
4668 // Throw out attempts to use copy-on-write through this API path
4669 //
4670 if ((Protect & PAGE_WRITECOPY) || (Protect & PAGE_EXECUTE_WRITECOPY))
4671 {
4672 DPRINT1("Write copy attempted when not allowed\n");
4673 Status = STATUS_INVALID_PAGE_PROTECTION;
4674 goto FailPath;
4675 }
4676
4677 //
4678 // Initialize a demand-zero PTE
4679 //
4680 TempPte.u.Long = 0;
4681 TempPte.u.Soft.Protection = ProtectionMask;
4682 NT_ASSERT(TempPte.u.Long != 0);
4683
4684 //
4685 // Get the PTE, PDE and the last PTE for this address range
4686 //
4687 PointerPde = MiAddressToPde(StartingAddress);
4688 PointerPte = MiAddressToPte(StartingAddress);
4689 LastPte = MiAddressToPte(EndingAddress);
4690
4691 //
4692 // Update the commit charge in the VAD as well as in the process, and check
4693 // if this commit charge was now higher than the last recorded peak, in which
4694 // case we also update the peak
4695 //
4696 FoundVad->u.VadFlags.CommitCharge += (1 + LastPte - PointerPte);
4697 Process->CommitCharge += (1 + LastPte - PointerPte);
4698 if (Process->CommitCharge > Process->CommitChargePeak)
4699 {
4700 Process->CommitChargePeak = Process->CommitCharge;
4701 }
4702
4703 //
4704 // Lock the working set while we play with user pages and page tables
4705 //
4706 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
4707
4708 //
4709 // Make the current page table valid, and then loop each page within it
4710 //
4711 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
4712 while (PointerPte <= LastPte)
4713 {
4714 //
4715 // Have we crossed into a new page table?
4716 //
4717 if (MiIsPteOnPdeBoundary(PointerPte))
4718 {
4719 //
4720 // Get the PDE and now make it valid too
4721 //
4722 PointerPde = MiAddressToPte(PointerPte);
4723 MiMakePdeExistAndMakeValid(PointerPde, Process, MM_NOIRQL);
4724 }
4725
4726 //
4727 // Is this a zero PTE as expected?
4728 //
4729 if (PointerPte->u.Long == 0)
4730 {
4731 //
4732 // First increment the count of pages in the page table for this
4733 // process
4734 //
4735 MiIncrementPageTableReferences(MiPteToAddress(PointerPte));
4736
4737 //
4738 // And now write the invalid demand-zero PTE as requested
4739 //
4740 MI_WRITE_INVALID_PTE(PointerPte, TempPte);
4741 }
4742 else if (PointerPte->u.Long == MmDecommittedPte.u.Long)
4743 {
4744 //
4745 // If the PTE was already decommitted, there is nothing else to do
4746 // but to write the new demand-zero PTE
4747 //
4748 MI_WRITE_INVALID_PTE(PointerPte, TempPte);
4749 }
4750 else if (!(ChangeProtection) && (Protect != MiGetPageProtection(PointerPte)))
4751 {
4752 //
4753 // We don't handle these scenarios yet
4754 //
4755 if (PointerPte->u.Soft.Valid == 0)
4756 {
4757 ASSERT(PointerPte->u.Soft.Prototype == 0);
4758 ASSERT(PointerPte->u.Soft.PageFileHigh == 0);
4759 }
4760
4761 //
4762 // There's a change in protection, remember this for later, but do
4763 // not yet handle it.
4764 //
4765 ChangeProtection = TRUE;
4766 }
4767
4768 //
4769 // Move to the next PTE
4770 //
4771 PointerPte++;
4772 }
4773
4774 //
4775 // Release the working set lock, unlock the address space, and detach from
4776 // the target process if it was not the current process. Also dereference the
4777 // target process if this wasn't the case.
4778 //
4779 MiUnlockProcessWorkingSetUnsafe(Process, CurrentThread);
4780 Status = STATUS_SUCCESS;
4781 FailPath:
4782 MmUnlockAddressSpace(AddressSpace);
4783
4784 //
4785 // Check if we need to update the protection
4786 //
4787 if (ChangeProtection)
4788 {
4789 PVOID ProtectBaseAddress = (PVOID)StartingAddress;
4790 SIZE_T ProtectSize = PRegionSize;
4791 ULONG OldProtection;
4792
4793 //
4794 // Change the protection of the region
4795 //
4796 MiProtectVirtualMemory(Process,
4797 &ProtectBaseAddress,
4798 &ProtectSize,
4799 Protect,
4800 &OldProtection);
4801 }
4802
4803 FailPathNoLock:
4804 if (Attached) KeUnstackDetachProcess(&ApcState);
4805 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
4806
4807 //
4808 // Use SEH to write back the base address and the region size. In the case
4809 // of an exception, we strangely do return back the exception code, even
4810 // though the memory *has* been allocated. This mimics Windows behavior and
4811 // there is not much we can do about it.
4812 //
4813 _SEH2_TRY
4814 {
4815 *URegionSize = PRegionSize;
4816 *UBaseAddress = (PVOID)StartingAddress;
4817 }
4818 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4819 {
4820 Status = _SEH2_GetExceptionCode();
4821 }
4822 _SEH2_END;
4823 return Status;
4824 }
4825
4826 /*
4827 * @implemented
4828 */
4829 NTSTATUS
4830 NTAPI
4831 NtFreeVirtualMemory(IN HANDLE ProcessHandle,
4832 IN PVOID* UBaseAddress,
4833 IN PSIZE_T URegionSize,
4834 IN ULONG FreeType)
4835 {
4836 PMEMORY_AREA MemoryArea;
4837 SIZE_T PRegionSize;
4838 PVOID PBaseAddress;
4839 LONG_PTR CommitReduction = 0;
4840 ULONG_PTR StartingAddress, EndingAddress;
4841 PMMVAD Vad;
4842 NTSTATUS Status;
4843 PEPROCESS Process;
4844 PMMSUPPORT AddressSpace;
4845 PETHREAD CurrentThread = PsGetCurrentThread();
4846 PEPROCESS CurrentProcess = PsGetCurrentProcess();
4847 KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
4848 KAPC_STATE ApcState;
4849 BOOLEAN Attached = FALSE;
4850 PAGED_CODE();
4851
4852 //
4853 // Only two flags are supported
4854 //
4855 if (!(FreeType & (MEM_RELEASE | MEM_DECOMMIT)))
4856 {
4857 DPRINT1("Invalid FreeType\n");
4858 return STATUS_INVALID_PARAMETER_4;
4859 }
4860
4861 //
4862 // Check if no flag was used, or if both flags were used
4863 //
4864 if (!((FreeType & (MEM_DECOMMIT | MEM_RELEASE))) ||
4865 ((FreeType & (MEM_DECOMMIT | MEM_RELEASE)) == (MEM_DECOMMIT | MEM_RELEASE)))
4866 {
4867 DPRINT1("Invalid FreeType combination\n");
4868 return STATUS_INVALID_PARAMETER_4;
4869 }
4870
4871 //
4872 // Enter SEH for probe and capture. On failure, return back to the caller
4873 // with an exception violation.
4874 //
4875 _SEH2_TRY
4876 {
4877 //
4878 // Check for user-mode parameters and make sure that they are writeable
4879 //
4880 if (PreviousMode != KernelMode)
4881 {
4882 ProbeForWritePointer(UBaseAddress);
4883 ProbeForWriteUlong(URegionSize);
4884 }
4885
4886 //
4887 // Capture the current values
4888 //
4889 PBaseAddress = *UBaseAddress;
4890 PRegionSize = *URegionSize;
4891 }
4892 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
4893 {
4894 _SEH2_YIELD(return _SEH2_GetExceptionCode());
4895 }
4896 _SEH2_END;
4897
4898 //
4899 // Make sure the allocation isn't past the user area
4900 //
4901 if (PBaseAddress >= MM_HIGHEST_USER_ADDRESS)
4902 {
4903 DPRINT1("Virtual free base above User Space\n");
4904 return STATUS_INVALID_PARAMETER_2;
4905 }
4906
4907 //
4908 // Make sure the allocation wouldn't overflow past the user area
4909 //
4910 if (((ULONG_PTR)MM_HIGHEST_USER_ADDRESS - (ULONG_PTR)PBaseAddress) < PRegionSize)
4911 {
4912 DPRINT1("Region size would overflow into kernel-memory\n");
4913 return STATUS_INVALID_PARAMETER_3;
4914 }
4915
4916 //
4917 // If this is for the current process, just use PsGetCurrentProcess
4918 //
4919 if (ProcessHandle == NtCurrentProcess())
4920 {
4921 Process = CurrentProcess;
4922 }
4923 else
4924 {
4925 //
4926 // Otherwise, reference the process with VM rights and attach to it if
4927 // this isn't the current process. We must attach because we'll be touching
4928 // PTEs and PDEs that belong to user-mode memory, and also touching the
4929 // Working Set which is stored in Hyperspace.
4930 //
4931 Status = ObReferenceObjectByHandle(ProcessHandle,
4932 PROCESS_VM_OPERATION,
4933 PsProcessType,
4934 PreviousMode,
4935 (PVOID*)&Process,
4936 NULL);
4937 if (!NT_SUCCESS(Status)) return Status;
4938 if (CurrentProcess != Process)
4939 {
4940 KeStackAttachProcess(&Process->Pcb, &ApcState);
4941 Attached = TRUE;
4942 }
4943 }
4944
4945 //
4946 // Lock the address space
4947 //
4948 AddressSpace = MmGetCurrentAddressSpace();
4949 MmLockAddressSpace(AddressSpace);
4950
4951 //
4952 // If the address space is being deleted, fail the de-allocation since it's
4953 // too late to do anything about it
4954 //
4955 if (Process->VmDeleted)
4956 {
4957 DPRINT1("Process is dead\n");
4958 Status = STATUS_PROCESS_IS_TERMINATING;
4959 goto FailPath;
4960 }
4961
4962 //
4963 // Compute start and end addresses, and locate the VAD
4964 //
4965 StartingAddress = (ULONG_PTR)PAGE_ALIGN(PBaseAddress);
4966 EndingAddress = ((ULONG_PTR)PBaseAddress + PRegionSize - 1) | (PAGE_SIZE - 1);
4967 Vad = MiLocateAddress((PVOID)StartingAddress);
4968 if (!Vad)
4969 {
4970 DPRINT1("Unable to find VAD for address 0x%p\n", StartingAddress);
4971 Status = STATUS_MEMORY_NOT_ALLOCATED;
4972 goto FailPath;
4973 }
4974
4975 //
4976 // If the range exceeds the VAD's ending VPN, fail this request
4977 //
4978 if (Vad->EndingVpn < (EndingAddress >> PAGE_SHIFT))
4979 {
4980 DPRINT1("Address 0x%p is beyond the VAD\n", EndingAddress);
4981 Status = STATUS_UNABLE_TO_FREE_VM;
4982 goto FailPath;
4983 }
4984
4985 //
4986 // Only private memory (except rotate VADs) can be freed through here */
4987 //
4988 if ((!(Vad->u.VadFlags.PrivateMemory) &&
4989 (Vad->u.VadFlags.VadType != VadRotatePhysical)) ||
4990 (Vad->u.VadFlags.VadType == VadDevicePhysicalMemory))
4991 {
4992 DPRINT1("Attempt to free section memory\n");
4993 Status = STATUS_UNABLE_TO_DELETE_SECTION;
4994 goto FailPath;
4995 }
4996
4997 //
4998 // ARM3 does not yet handle protected VM
4999 //
5000 ASSERT(Vad->u.VadFlags.NoChange == 0);
5001
5002 //
5003 // Finally, make sure there is a ReactOS Mm MEMORY_AREA for this allocation
5004 // and that is is an ARM3 memory area, and not a section view, as we currently
5005 // don't support freeing those though this interface.
5006 //
5007 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, (PVOID)StartingAddress);
5008 ASSERT(MemoryArea);
5009 ASSERT(MemoryArea->Type == MEMORY_AREA_OWNED_BY_ARM3);
5010
5011 //
5012 // Now we can try the operation. First check if this is a RELEASE or a DECOMMIT
5013 //
5014 if (FreeType & MEM_RELEASE)
5015 {
5016 //
5017 // ARM3 only supports this VAD in this path
5018 //
5019 ASSERT(Vad->u.VadFlags.VadType == VadNone);
5020
5021 //
5022 // Is the caller trying to remove the whole VAD, or remove only a portion
5023 // of it? If no region size is specified, then the assumption is that the
5024 // whole VAD is to be destroyed
5025 //
5026 if (!PRegionSize)
5027 {
5028 //
5029 // The caller must specify the base address identically to the range
5030 // that is stored in the VAD.
5031 //
5032 if (((ULONG_PTR)PBaseAddress >> PAGE_SHIFT) != Vad->StartingVpn)
5033 {
5034 DPRINT1("Address 0x%p does not match the VAD\n", PBaseAddress);
5035 Status = STATUS_FREE_VM_NOT_AT_BASE;
5036 goto FailPath;
5037 }
5038
5039 //
5040 // Now compute the actual start/end addresses based on the VAD
5041 //
5042 StartingAddress = Vad->StartingVpn << PAGE_SHIFT;
5043 EndingAddress = (Vad->EndingVpn << PAGE_SHIFT) | (PAGE_SIZE - 1);
5044
5045 //
5046 // Finally lock the working set and remove the VAD from the VAD tree
5047 //
5048 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
5049 ASSERT(Process->VadRoot.NumberGenericTableElements >= 1);
5050 MiRemoveNode((PMMADDRESS_NODE)Vad, &Process->VadRoot);
5051 }
5052 else
5053 {
5054 //
5055 // This means the caller wants to release a specific region within
5056 // the range. We have to find out which range this is -- the following
5057 // possibilities exist plus their union (CASE D):
5058 //
5059 // STARTING ADDRESS ENDING ADDRESS
5060 // [<========][========================================][=========>]
5061 // CASE A CASE B CASE C
5062 //
5063 //
5064 // First, check for case A or D
5065 //
5066 if ((StartingAddress >> PAGE_SHIFT) == Vad->StartingVpn)
5067 {
5068 //
5069 // Check for case D
5070 //
5071 if ((EndingAddress >> PAGE_SHIFT) == Vad->EndingVpn)
5072 {
5073 //
5074 // This is the easiest one to handle -- it is identical to
5075 // the code path above when the caller sets a zero region size
5076 // and the whole VAD is destroyed
5077 //
5078 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
5079 ASSERT(Process->VadRoot.NumberGenericTableElements >= 1);
5080 MiRemoveNode((PMMADDRESS_NODE)Vad, &Process->VadRoot);
5081 }
5082 else
5083 {
5084 //
5085 // This case is pretty easy too -- we compute a bunch of
5086 // pages to decommit, and then push the VAD's starting address
5087 // a bit further down, then decrement the commit charge
5088 //
5089 // NOT YET IMPLEMENTED IN ARM3.
5090 //
5091 DPRINT1("Case A not handled\n");
5092 Status = STATUS_FREE_VM_NOT_AT_BASE;
5093 goto FailPath;
5094
5095 //
5096 // After analyzing the VAD, set it to NULL so that we don't
5097 // free it in the exit path
5098 //
5099 Vad = NULL;
5100 }
5101 }
5102 else
5103 {
5104 //
5105 // This is case B or case C. First check for case C
5106 //
5107 if ((EndingAddress >> PAGE_SHIFT) == Vad->EndingVpn)
5108 {
5109 PMEMORY_AREA MemoryArea;
5110
5111 //
5112 // This is pretty easy and similar to case A. We compute the
5113 // amount of pages to decommit, update the VAD's commit charge
5114 // and then change the ending address of the VAD to be a bit
5115 // smaller.
5116 //
5117 MiLockProcessWorkingSetUnsafe(Process, CurrentThread);
5118 CommitReduction = MiCalculatePageCommitment(StartingAddress,
5119 EndingAddress,
5120 Vad,
5121 Process);
5122 Vad->u.VadFlags.CommitCharge -= CommitReduction;
5123 // For ReactOS: shrink the corresponding memory area
5124 MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, (PVOID)StartingAddress);
5125 ASSERT(Vad->StartingVpn << PAGE_SHIFT == (ULONG_PTR)MemoryArea->StartingAddress);
5126 ASSERT((Vad->EndingVpn + 1) << PAGE_SHIFT == (ULONG_PTR)MemoryArea->EndingAddress);
5127 Vad->EndingVpn = ((ULONG_PTR)StartingAddress - 1) >> PAGE_SHIFT;
5128 MemoryArea->EndingAddress = (PVOID)(((Vad->EndingVpn + 1) << PAGE_SHIFT) - 1);
5129 }
5130 else
5131 {
5132 //
5133 // This is case B and the hardest one. Because we are removing
5134 // a chunk of memory from the very middle of the VAD, we must
5135 // actually split the VAD into two new VADs and compute the
5136 // commit charges for each of them, and reinsert new charges.
5137 //
5138 // NOT YET IMPLEMENTED IN ARM3.
5139 //
5140 DPRINT1("Case B not handled\n");
5141 Status = STATUS_FREE_VM_NOT_AT_BASE;
5142 goto FailPath;
5143 }
5144
5145 //
5146 // After analyzing the VAD, set it to NULL so that we don't
5147 // free it in the exit path
5148 //
5149 Vad = NULL;
5150 }
5151 }
5152
5153 //
5154 // Now we have a range of pages to dereference, so call the right API
5155 // to do that and then release the working set, since we're done messing
5156 // around with process pages.
5157 //
5158 MiDeleteVirtualAddresses(StartingAddress, EndingAddress, NULL);
5159 MiUnlockProcessWorkingSetUnsafe(Process, CurrentThread);
5160 Status = STATUS_SUCCESS;
5161
5162 FinalPath:
5163 //
5164 // Update the process counters
5165 //
5166 PRegionSize = EndingAddress - StartingAddress + 1;
5167 Process->CommitCharge -= CommitReduction;
5168 if (FreeType & MEM_RELEASE) Process->VirtualSize -= PRegionSize;
5169
5170 //
5171 // Unlock the address space and free the VAD in failure cases. Next,
5172 // detach from the target process so we can write the region size and the
5173 // base address to the correct source process, and dereference the target
5174 // process.
5175 //
5176 MmUnlockAddressSpace(AddressSpace);
5177 if (Vad) ExFreePool(Vad);
5178 if (Attached) KeUnstackDetachProcess(&ApcState);
5179 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
5180
5181 //
5182 // Use SEH to safely return the region size and the base address of the
5183 // deallocation. If we get an access violation, don't return a failure code
5184 // as the deallocation *has* happened. The caller will just have to figure
5185 // out another way to find out where it is (such as VirtualQuery).
5186 //
5187 _SEH2_TRY
5188 {
5189 *URegionSize = PRegionSize;
5190 *UBaseAddress = (PVOID)StartingAddress;
5191 }
5192 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
5193 {
5194 }
5195 _SEH2_END;
5196 return Status;
5197 }
5198
5199 //
5200 // This is the decommit path. You cannot decommit from the following VADs in
5201 // Windows, so fail the vall
5202 //
5203 if ((Vad->u.VadFlags.VadType == VadAwe) ||
5204 (Vad->u.VadFlags.VadType == VadLargePages) ||
5205 (Vad->u.VadFlags.VadType == VadRotatePhysical))
5206 {
5207 DPRINT1("Trying to decommit from invalid VAD\n");
5208 Status = STATUS_MEMORY_NOT_ALLOCATED;
5209 goto FailPath;
5210 }
5211
5212 //
5213 // If the caller did not specify a region size, first make sure that this
5214 // region is actually committed. If it is, then compute the ending address
5215 // based on the VAD.
5216 //
5217 if (!PRegionSize)
5218 {
5219 if (((ULONG_PTR)PBaseAddress >> PAGE_SHIFT) != Vad->StartingVpn)
5220 {
5221 DPRINT1("Decomitting non-committed memory\n");
5222 Status = STATUS_FREE_VM_NOT_AT_BASE;
5223 goto FailPath;
5224 }
5225 EndingAddress = (Vad->EndingVpn << PAGE_SHIFT) | (PAGE_SIZE - 1);
5226 }
5227
5228 //
5229 // Decommit the PTEs for the range plus the actual backing pages for the
5230 // range, then reduce that amount from the commit charge in the VAD
5231 //
5232 CommitReduction = MiAddressToPte(EndingAddress) -
5233 MiAddressToPte(StartingAddress) +
5234 1 -
5235 MiDecommitPages((PVOID)StartingAddress,
5236 MiAddressToPte(EndingAddress),
5237 Process,
5238 Vad);
5239 ASSERT(CommitReduction >= 0);
5240 Vad->u.VadFlags.CommitCharge -= CommitReduction;
5241 ASSERT(Vad->u.VadFlags.CommitCharge >= 0);
5242
5243 //
5244 // We are done, go to the exit path without freeing the VAD as it remains
5245 // valid since we have not released the allocation.
5246 //
5247 Vad = NULL;
5248 Status = STATUS_SUCCESS;
5249 goto FinalPath;
5250
5251 //
5252 // In the failure path, we detach and derefernece the target process, and
5253 // return whatever failure code was sent.
5254 //
5255 FailPath:
5256 MmUnlockAddressSpace(AddressSpace);
5257 if (Attached) KeUnstackDetachProcess(&ApcState);
5258 if (ProcessHandle != NtCurrentProcess()) ObDereferenceObject(Process);
5259 return Status;
5260 }
5261
5262
5263 PHYSICAL_ADDRESS
5264 NTAPI
5265 MmGetPhysicalAddress(PVOID Address)
5266 {
5267 PHYSICAL_ADDRESS PhysicalAddress;
5268 MMPDE TempPde;
5269 MMPTE TempPte;
5270
5271 /* Check if the PXE/PPE/PDE is valid */
5272 if (
5273 #if (_MI_PAGING_LEVELS == 4)
5274 (MiAddressToPxe(Address)->u.Hard.Valid) &&
5275 #endif
5276 #if (_MI_PAGING_LEVELS >= 3)
5277 (MiAddressToPpe(Address)->u.Hard.Valid) &&
5278 #endif
5279 (MiAddressToPde(Address)->u.Hard.Valid))
5280 {
5281 /* Check for large pages */
5282 TempPde = *MiAddressToPde(Address);
5283 if (TempPde.u.Hard.LargePage)
5284 {
5285 /* Physical address is base page + large page offset */
5286 PhysicalAddress.QuadPart = (ULONG64)TempPde.u.Hard.PageFrameNumber << PAGE_SHIFT;
5287 PhysicalAddress.QuadPart += ((ULONG_PTR)Address & (PAGE_SIZE * PTE_PER_PAGE - 1));
5288 return PhysicalAddress;
5289 }
5290
5291 /* Check if the PTE is valid */
5292 TempPte = *MiAddressToPte(Address);
5293 if (TempPte.u.Hard.Valid)
5294 {
5295 /* Physical address is base page + page offset */
5296 PhysicalAddress.QuadPart = (ULONG64)TempPte.u.Hard.PageFrameNumber << PAGE_SHIFT;
5297 PhysicalAddress.QuadPart += ((ULONG_PTR)Address & (PAGE_SIZE - 1));
5298 return PhysicalAddress;
5299 }
5300 }
5301
5302 KeRosDumpStackFrames(NULL, 20);
5303 DPRINT1("MM:MmGetPhysicalAddressFailed base address was %p\n", Address);
5304 PhysicalAddress.QuadPart = 0;
5305 return PhysicalAddress;
5306 }
5307
5308
5309 /* EOF */
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