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[NTOSKRNL] Map the VACB in kernel space before inserting it in lists.

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The avoids race conditions where attempts to read from disk to
not fully initialized VACB were performed.
Also, added more debug prints in such situations.

CORE-14349
This commit is contained in:
Pierre Schweitzer
2018-04-08 18:45:38 +02:00
parent 42df4683d7
commit 1b672981e2
2 changed files with 15 additions and 13 deletions
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2
ntoskrnl/cc/copy.c
View File

@@ -110,6 +110,7 @@ CcReadVirtualAddress (
_SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
DPRINT1("MmProbeAndLockPages failed with: %lx for %p (%p, %p)\n", Status, Mdl, Vacb, Vacb->BaseAddress);
KeBugCheck(CACHE_MANAGER);
} _SEH2_END;
@@ -186,6 +187,7 @@ CcWriteVirtualAddress (
_SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
DPRINT1("MmProbeAndLockPages failed with: %lx for %p (%p, %p)\n", Status, Mdl, Vacb, Vacb->BaseAddress);
KeBugCheck(CACHE_MANAGER);
} _SEH2_END;

26
ntoskrnl/cc/view.c
View File

@@ -752,6 +752,17 @@ CcRosCreateVacb (
InitializeListHead(&current->CacheMapVacbListEntry);
InitializeListHead(&current->DirtyVacbListEntry);
InitializeListHead(&current->VacbLruListEntry);
CcRosVacbIncRefCount(current);
Status = CcRosMapVacbInKernelSpace(current);
if (!NT_SUCCESS(Status))
{
CcRosVacbDecRefCount(current);
ExFreeToNPagedLookasideList(&VacbLookasideList, current);
return Status;
}
CcRosAcquireVacbLock(current, NULL);
KeAcquireGuardedMutex(&ViewLock);
@@ -784,9 +795,10 @@ CcRosCreateVacb (
current);
}
#endif
CcRosVacbDecRefCount(*Vacb);
CcRosReleaseVacbLock(*Vacb);
KeReleaseGuardedMutex(&ViewLock);
ExFreeToNPagedLookasideList(&VacbLookasideList, *Vacb);
CcRosInternalFreeVacb(*Vacb);
*Vacb = current;
CcRosAcquireVacbLock(current, NULL);
return STATUS_SUCCESS;
@@ -813,7 +825,6 @@ CcRosCreateVacb (
}
KeReleaseSpinLock(&SharedCacheMap->CacheMapLock, oldIrql);
InsertTailList(&VacbLruListHead, &current->VacbLruListEntry);
CcRosVacbIncRefCount(current);
KeReleaseGuardedMutex(&ViewLock);
MI_SET_USAGE(MI_USAGE_CACHE);
@@ -838,17 +849,6 @@ CcRosCreateVacb (
/* Reference it to allow release */
CcRosVacbIncRefCount(current);
Status = CcRosMapVacbInKernelSpace(current);
if (!NT_SUCCESS(Status))
{
RemoveEntryList(&current->CacheMapVacbListEntry);
RemoveEntryList(&current->VacbLruListEntry);
CcRosReleaseVacb(SharedCacheMap, current, FALSE,
FALSE, FALSE);
CcRosVacbDecRefCount(current);
ExFreeToNPagedLookasideList(&VacbLookasideList, current);
}
return Status;
}