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[NTOSKRNL] Rework ObpDeleteSymbolicLinkName and ObpCreateSymbolicLinkName
So that they handle LUID mappings and process device maps. Get rid of the ObpParseSymbolicLinkToIoDeviceObject helper and introduce a new helper ObpProcessDosDeviceSymbolicLink that will do the same things but also handle name creation/deletion as well as device map handling. All this is based on previous code (hence the same comments :-)). What's left to do now is to add support for device maps in ObpLookupObjectName
This commit is contained in:
Pierre Schweitzer
parent
acc821e1ea
commit
f6eb13a969
1 changed files with 289 additions and 222 deletions
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@ -20,288 +20,355 @@ POBJECT_TYPE ObpSymbolicLinkObjectType = NULL;
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/* PRIVATE FUNCTIONS *********************************************************/
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VOID
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NTAPI
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ObpDeleteSymbolicLinkName(IN POBJECT_SYMBOLIC_LINK SymbolicLink)
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ObpProcessDosDeviceSymbolicLink(IN POBJECT_SYMBOLIC_LINK SymbolicLink,
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IN BOOLEAN DeleteLink)
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{
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PDEVICE_MAP DeviceMap;
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UNICODE_STRING TargetPath, LocalTarget;
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POBJECT_DIRECTORY NameDirectory, DirectoryObject;
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ULONG MaxReparse;
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OBP_LOOKUP_CONTEXT LookupContext;
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ULONG DriveType;
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POBJECT_HEADER ObjectHeader;
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POBJECT_HEADER_NAME_INFO ObjectNameInfo;
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BOOLEAN DirectoryLocked;
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PVOID Object;
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/* FIXME: Need to support Device maps */
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/*
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* To prevent endless reparsing, setting an upper limit on the
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* number of reparses.
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*/
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MaxReparse = 32;
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NameDirectory = NULL;
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/* Get header data */
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ObjectHeader = OBJECT_TO_OBJECT_HEADER(SymbolicLink);
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ObjectNameInfo = ObpReferenceNameInfo(ObjectHeader);
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ObjectNameInfo = OBJECT_HEADER_TO_NAME_INFO(ObjectHeader);
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/* Check if we are not actually in a directory with a device map */
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if (!(ObjectNameInfo) ||
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!(ObjectNameInfo->Directory) /*||
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!(ObjectNameInfo->Directory->DeviceMap)*/)
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/* Check if we have a directory in our symlink to use */
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if (ObjectNameInfo != NULL)
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{
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ObpDereferenceNameInfo(ObjectNameInfo);
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return;
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NameDirectory = ObjectNameInfo->Directory;
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}
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/* Check if it's a DOS drive letter, and remove the entry from drive map if needed */
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if (SymbolicLink->DosDeviceDriveIndex != 0 &&
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ObjectNameInfo->Name.Length == 2 * sizeof(WCHAR) &&
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ObjectNameInfo->Name.Buffer[1] == L':' &&
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( (ObjectNameInfo->Name.Buffer[0] >= L'A' &&
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ObjectNameInfo->Name.Buffer[0] <= L'Z') ||
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(ObjectNameInfo->Name.Buffer[0] >= L'a' &&
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ObjectNameInfo->Name.Buffer[0] <= L'z') ))
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/* Initialize lookup context */
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ObpInitializeLookupContext(&LookupContext);
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/*
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* If we have to create the link, locate the IoDeviceObject if any
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* this symbolic link points to.
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*/
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if (SymbolicLink->LinkTargetObject != NULL || !DeleteLink)
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{
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/* Remove the drive entry */
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KeAcquireGuardedMutex(&ObpDeviceMapLock);
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ObSystemDeviceMap->DriveType[SymbolicLink->DosDeviceDriveIndex-1] =
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DOSDEVICE_DRIVE_UNKNOWN;
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ObSystemDeviceMap->DriveMap &=
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~(1 << (SymbolicLink->DosDeviceDriveIndex-1));
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KeReleaseGuardedMutex(&ObpDeviceMapLock);
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/* Start the search from the root */
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DirectoryObject = ObpRootDirectoryObject;
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/* Reset the drive index, valid drive index starts from 1 */
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SymbolicLink->DosDeviceDriveIndex = 0;
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}
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/* Keep track of our progress while parsing the name */
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LocalTarget = SymbolicLink->LinkTarget;
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ObpDereferenceNameInfo(ObjectNameInfo);
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}
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NTSTATUS
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NTAPI
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ObpParseSymbolicLinkToIoDeviceObject(IN POBJECT_DIRECTORY SymbolicLinkDirectory,
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IN OUT POBJECT_DIRECTORY *Directory,
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IN OUT PUNICODE_STRING TargetPath,
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IN OUT POBP_LOOKUP_CONTEXT Context,
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OUT PVOID *Object)
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{
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UNICODE_STRING Name;
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BOOLEAN ManualUnlock;
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if (! TargetPath || ! Object || ! Context || ! Directory ||
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! SymbolicLinkDirectory)
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{
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return STATUS_INVALID_PARAMETER;
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}
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/* FIXME: Need to support Device maps */
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/* Try walking the target path and open each part of the path */
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while (TargetPath->Length)
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{
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/* Strip '\' if present at the beginning of the target path */
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if (TargetPath->Length >= sizeof(OBJ_NAME_PATH_SEPARATOR)&&
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TargetPath->Buffer[0] == OBJ_NAME_PATH_SEPARATOR)
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/* If LUID mappings are enabled, use system map */
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if (ObpLUIDDeviceMapsEnabled != 0)
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{
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TargetPath->Buffer++;
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TargetPath->Length -= sizeof(OBJ_NAME_PATH_SEPARATOR);
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DeviceMap = ObSystemDeviceMap;
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}
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/* Otherwise, use the one in the process */
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else
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{
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DeviceMap = PsGetCurrentProcess()->DeviceMap;
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}
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/* Remember the current component of the target path */
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Name = *TargetPath;
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/* Move forward to the next component of the target path */
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while (TargetPath->Length >= sizeof(OBJ_NAME_PATH_SEPARATOR))
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ReparseTargetPath:
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/*
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* If we have a device map active, check whether we have a drive
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* letter prefixed with ??, if so, chomp it
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*/
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if (DeviceMap != NULL)
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{
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if (TargetPath->Buffer[0] != OBJ_NAME_PATH_SEPARATOR)
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if (!((ULONG_PTR)(LocalTarget.Buffer) & 7))
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{
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TargetPath->Buffer++;
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TargetPath->Length -= sizeof(OBJ_NAME_PATH_SEPARATOR);
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if (DeviceMap->DosDevicesDirectory != NULL)
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{
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if (LocalTarget.Length >= ObpDosDevicesShortName.Length &&
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(*(PULONGLONG)LocalTarget.Buffer ==
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ObpDosDevicesShortNamePrefix.Alignment.QuadPart))
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{
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DirectoryObject = DeviceMap->DosDevicesDirectory;
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LocalTarget.Length -= ObpDosDevicesShortName.Length;
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LocalTarget.Buffer += (ObpDosDevicesShortName.Length / sizeof(WCHAR));
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}
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}
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}
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}
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/* Try walking the target path and open each part of the path */
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while (TRUE)
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{
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if (LocalTarget.Buffer[0] == OBJ_NAME_PATH_SEPARATOR)
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{
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++LocalTarget.Buffer;
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LocalTarget.Length -= sizeof(WCHAR);
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}
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/* Remember the current component of the target path */
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TargetPath = LocalTarget;
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/* Move forward to the next component of the target path */
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if (LocalTarget.Length != 0)
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{
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do
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{
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if (LocalTarget.Buffer[0] == OBJ_NAME_PATH_SEPARATOR)
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{
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break;
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}
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++LocalTarget.Buffer;
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LocalTarget.Length -= sizeof(WCHAR);
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}
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while (LocalTarget.Length != 0);
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}
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TargetPath.Length -= LocalTarget.Length;
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/*
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* Finished processing the entire path, stop
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* That's a failure case, we quit here
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*/
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if (TargetPath.Length == 0)
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{
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ObpReleaseLookupContext(&LookupContext);
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return;
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}
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/*
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* Make sure a deadlock does not occur as an exclusive lock on a pushlock
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* would have already taken one in ObpLookupObjectName() on the parent
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* directory where the symlink is being created [ObInsertObject()].
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* Prevent recursive locking by faking lock state in the lookup context
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* when the current directory is same as the parent directory where
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* the symlink is being created. If the lock state is not faked,
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* ObpLookupEntryDirectory() will try to get a recursive lock on the
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* pushlock and hang. For e.g. this happens when a substed drive is pointed to
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* another substed drive.
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*/
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if (DirectoryObject == NameDirectory)
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{
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DirectoryLocked = LookupContext.DirectoryLocked;
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LookupContext.DirectoryLocked = TRUE;
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}
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else
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{
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DirectoryLocked = FALSE;
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}
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Object = ObpLookupEntryDirectory(DirectoryObject,
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&TargetPath,
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0,
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FALSE,
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&LookupContext);
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/* Locking was faked, undo it now */
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if (DirectoryObject == NameDirectory)
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{
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LookupContext.DirectoryLocked = DirectoryLocked;
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}
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/* Lookup failed, stop */
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if (Object == NULL)
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{
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break;
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}
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}
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Name.Length -= TargetPath->Length;
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/* If we don't have a directory object, we'll have to handle the object */
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if (OBJECT_TO_OBJECT_HEADER(Object)->Type != ObpDirectoryObjectType)
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{
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/* If that's not a symbolic link, stop here, nothing to do */
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if (OBJECT_TO_OBJECT_HEADER(Object)->Type != ObpSymbolicLinkObjectType ||
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(((POBJECT_SYMBOLIC_LINK)Object)->DosDeviceDriveIndex != 0))
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{
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break;
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}
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/* Finished processing the entire path, stop */
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if (! Name.Length)
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break;
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/* We're out of reparse attempts */
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if (MaxReparse == 0)
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{
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Object = NULL;
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break;
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}
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/*
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* Make sure a deadlock does not occur as an exclusive lock on a pushlock
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* would have already taken one in ObpLookupObjectName() on the parent
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* directory where the symlink is being created [ObInsertObject()].
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* Prevent recursive locking by faking lock state in the lookup context
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* when the current directory is same as the parent directory where
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* the symlink is being created. If the lock state is not faked,
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* ObpLookupEntryDirectory() will try to get a recursive lock on the
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* pushlock and hang. For e.g. this happens when a substed drive is pointed to
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* another substed drive.
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*/
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if (*Directory == SymbolicLinkDirectory && ! Context->DirectoryLocked)
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{
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/* Fake lock state so that ObpLookupEntryDirectory() doesn't attempt a lock */
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ManualUnlock = TRUE;
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Context->DirectoryLocked = TRUE;
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}
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else
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ManualUnlock = FALSE;
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--MaxReparse;
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*Object = ObpLookupEntryDirectory(*Directory,
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&Name,
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0,
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FALSE,
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Context);
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/* Symlink points to another initialized symlink, ask caller to reparse */
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DirectoryObject = ObpRootDirectoryObject;
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/* Locking was faked, undo it now */
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if (*Directory == SymbolicLinkDirectory && ManualUnlock)
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Context->DirectoryLocked = FALSE;
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LocalTarget = ((POBJECT_SYMBOLIC_LINK)Object)->LinkTarget;
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/* Lookup failed, stop */
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if (! *Object)
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break;
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goto ReparseTargetPath;
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}
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if (OBJECT_TO_OBJECT_HEADER(*Object)->Type == ObpDirectoryObjectType)
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{
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/* Make this current directory, and continue search */
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*Directory = (POBJECT_DIRECTORY)*Object;
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}
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else if (OBJECT_TO_OBJECT_HEADER(*Object)->Type == ObpSymbolicLinkObjectType &&
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(((POBJECT_SYMBOLIC_LINK)*Object)->DosDeviceDriveIndex == 0))
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{
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/* Symlink points to another initialized symlink, ask caller to reparse */
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*Directory = ObpRootDirectoryObject;
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TargetPath = &((POBJECT_SYMBOLIC_LINK)*Object)->LinkTarget;
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return STATUS_REPARSE_OBJECT;
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}
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else
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{
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/* Neither directory or symlink, stop */
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break;
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DirectoryObject = Object;
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}
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}
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/* Return a valid object, only if object type is IoDeviceObject */
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if (*Object &&
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OBJECT_TO_OBJECT_HEADER(*Object)->Type != IoDeviceObjectType)
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DeviceMap = NULL;
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/* That's a drive letter, find a suitable device map */
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if (SymbolicLink->DosDeviceDriveIndex != 0)
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{
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*Object = NULL;
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ObjectHeader = OBJECT_TO_OBJECT_HEADER(SymbolicLink);
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ObjectNameInfo = ObpReferenceNameInfo(ObjectHeader);
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if (ObjectNameInfo != NULL)
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{
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if (ObjectNameInfo->Directory != NULL)
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{
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DeviceMap = ObjectNameInfo->Directory->DeviceMap;
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}
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ObpDereferenceNameInfo(ObjectNameInfo);
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}
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}
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return STATUS_SUCCESS;
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/* If we were asked to delete the symlink */
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if (DeleteLink)
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{
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/* Zero its target */
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RtlInitUnicodeString(&SymbolicLink->LinkTargetRemaining, NULL);
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/* If we had a target objected, dereference it */
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if (SymbolicLink->LinkTargetObject != NULL)
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{
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ObDereferenceObject(SymbolicLink->LinkTargetObject);
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SymbolicLink->LinkTargetObject = NULL;
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}
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/* If it was a drive letter */
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if (DeviceMap != NULL)
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{
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/* Acquire the device map lock */
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KeAcquireGuardedMutex(&ObpDeviceMapLock);
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/* Remove the drive entry */
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DeviceMap->DriveType[SymbolicLink->DosDeviceDriveIndex - 1] =
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DOSDEVICE_DRIVE_UNKNOWN;
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DeviceMap->DriveMap &=
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~(1 << (SymbolicLink->DosDeviceDriveIndex - 1));
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/* Release the device map lock */
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KeReleaseGuardedMutex(&ObpDeviceMapLock);
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/* Reset the drive index, valid drive index starts from 1 */
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SymbolicLink->DosDeviceDriveIndex = 0;
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}
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}
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else
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{
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DriveType = DOSDEVICE_DRIVE_CALCULATE;
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/* If we have a drive letter and a pointer device object */
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if (Object != NULL && SymbolicLink->DosDeviceDriveIndex != 0 &&
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OBJECT_TO_OBJECT_HEADER(Object)->Type == IoDeviceObjectType)
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{
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/* Calculate the drive type */
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switch(((PDEVICE_OBJECT)Object)->DeviceType)
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{
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case FILE_DEVICE_VIRTUAL_DISK:
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DriveType = DOSDEVICE_DRIVE_RAMDISK;
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break;
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case FILE_DEVICE_CD_ROM:
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case FILE_DEVICE_CD_ROM_FILE_SYSTEM:
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DriveType = DOSDEVICE_DRIVE_CDROM;
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break;
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case FILE_DEVICE_DISK:
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case FILE_DEVICE_DISK_FILE_SYSTEM:
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case FILE_DEVICE_FILE_SYSTEM:
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if (((PDEVICE_OBJECT)Object)->Characteristics & FILE_REMOVABLE_MEDIA)
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DriveType = DOSDEVICE_DRIVE_REMOVABLE;
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else
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DriveType = DOSDEVICE_DRIVE_FIXED;
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break;
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case FILE_DEVICE_NETWORK:
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case FILE_DEVICE_NETWORK_FILE_SYSTEM:
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DriveType = DOSDEVICE_DRIVE_REMOTE;
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break;
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default:
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DPRINT1("Device Type %lu for %wZ is not known or unhandled\n",
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((PDEVICE_OBJECT)Object)->DeviceType,
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&SymbolicLink->LinkTarget);
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DriveType = DOSDEVICE_DRIVE_UNKNOWN;
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}
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}
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/* Add a new drive entry */
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if (DeviceMap != NULL)
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{
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/* Acquire the device map lock */
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KeAcquireGuardedMutex(&ObpDeviceMapLock);
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DeviceMap->DriveType[SymbolicLink->DosDeviceDriveIndex - 1] =
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(UCHAR)DriveType;
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DeviceMap->DriveMap |=
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1 << (SymbolicLink->DosDeviceDriveIndex - 1);
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/* Release the device map lock */
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KeReleaseGuardedMutex(&ObpDeviceMapLock);
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}
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}
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/* Cleanup */
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ObpReleaseLookupContext(&LookupContext);
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}
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VOID
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NTAPI
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ObpDeleteSymbolicLinkName(IN POBJECT_SYMBOLIC_LINK SymbolicLink)
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{
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/* Just call the helper */
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ObpProcessDosDeviceSymbolicLink(SymbolicLink, TRUE);
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}
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VOID
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NTAPI
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ObpCreateSymbolicLinkName(IN POBJECT_SYMBOLIC_LINK SymbolicLink)
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{
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WCHAR UpperDrive;
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POBJECT_HEADER ObjectHeader;
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POBJECT_HEADER_NAME_INFO ObjectNameInfo;
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PVOID Object = NULL;
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POBJECT_DIRECTORY Directory;
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UNICODE_STRING TargetPath;
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NTSTATUS Status;
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ULONG DriveType = DOSDEVICE_DRIVE_CALCULATE;
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ULONG ReparseCnt;
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const ULONG MaxReparseAttempts = 20;
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OBP_LOOKUP_CONTEXT Context;
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/* FIXME: Need to support Device maps */
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/* Get header data */
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ObjectHeader = OBJECT_TO_OBJECT_HEADER(SymbolicLink);
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ObjectNameInfo = ObpReferenceNameInfo(ObjectHeader);
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/* Check if we are not actually in a directory with a device map */
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if (!(ObjectNameInfo) ||
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!(ObjectNameInfo->Directory) /*||
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!(ObjectNameInfo->Directory->DeviceMap)*/)
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/* No name info, nothing to create */
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if (ObjectNameInfo == NULL)
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{
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ObpDereferenceNameInfo(ObjectNameInfo);
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return;
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}
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/* Check if it's a DOS drive letter, and set the drive index accordingly */
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if (ObjectNameInfo->Name.Length == 2 * sizeof(WCHAR) &&
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ObjectNameInfo->Name.Buffer[1] == L':' &&
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( (ObjectNameInfo->Name.Buffer[0] >= L'A' &&
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ObjectNameInfo->Name.Buffer[0] <= L'Z') ||
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(ObjectNameInfo->Name.Buffer[0] >= L'a' &&
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ObjectNameInfo->Name.Buffer[0] <= L'z') ))
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/* If we have a device map, look for creating a letter based drive */
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if (ObjectNameInfo->Directory != NULL &&
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ObjectNameInfo->Directory->DeviceMap != NULL)
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{
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SymbolicLink->DosDeviceDriveIndex =
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RtlUpcaseUnicodeChar(ObjectNameInfo->Name.Buffer[0]) - L'A';
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/* The Drive index start from 1 */
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SymbolicLink->DosDeviceDriveIndex++;
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/* Initialize lookup context */
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ObpInitializeLookupContext(&Context);
|
||||
|
||||
/* Start the search from the root */
|
||||
Directory = ObpRootDirectoryObject;
|
||||
TargetPath = SymbolicLink->LinkTarget;
|
||||
|
||||
/*
|
||||
* Locate the IoDeviceObject if any this symbolic link points to.
|
||||
* To prevent endless reparsing, setting an upper limit on the
|
||||
* number of reparses.
|
||||
*/
|
||||
Status = STATUS_REPARSE_OBJECT;
|
||||
ReparseCnt = 0;
|
||||
while (Status == STATUS_REPARSE_OBJECT &&
|
||||
ReparseCnt < MaxReparseAttempts)
|
||||
/* Is it a drive letter based name? */
|
||||
if (ObjectNameInfo->Name.Length == 2 * sizeof(WCHAR))
|
||||
{
|
||||
Status =
|
||||
ObpParseSymbolicLinkToIoDeviceObject(ObjectNameInfo->Directory,
|
||||
&Directory,
|
||||
&TargetPath,
|
||||
&Context,
|
||||
&Object);
|
||||
if (Status == STATUS_REPARSE_OBJECT)
|
||||
ReparseCnt++;
|
||||
}
|
||||
|
||||
/* Cleanup lookup context */
|
||||
ObpReleaseLookupContext(&Context);
|
||||
|
||||
/* Error, or max resparse attemtps exceeded */
|
||||
if (! NT_SUCCESS(Status) || ReparseCnt >= MaxReparseAttempts)
|
||||
{
|
||||
/* Cleanup */
|
||||
ObpDereferenceNameInfo(ObjectNameInfo);
|
||||
return;
|
||||
}
|
||||
|
||||
if (Object)
|
||||
{
|
||||
/* Calculate the drive type */
|
||||
switch(((PDEVICE_OBJECT)Object)->DeviceType)
|
||||
if (ObjectNameInfo->Name.Buffer[1] == L':')
|
||||
{
|
||||
case FILE_DEVICE_VIRTUAL_DISK:
|
||||
DriveType = DOSDEVICE_DRIVE_RAMDISK;
|
||||
break;
|
||||
case FILE_DEVICE_CD_ROM:
|
||||
case FILE_DEVICE_CD_ROM_FILE_SYSTEM:
|
||||
DriveType = DOSDEVICE_DRIVE_CDROM;
|
||||
break;
|
||||
case FILE_DEVICE_DISK:
|
||||
case FILE_DEVICE_DISK_FILE_SYSTEM:
|
||||
case FILE_DEVICE_FILE_SYSTEM:
|
||||
if (((PDEVICE_OBJECT)Object)->Characteristics & FILE_REMOVABLE_MEDIA)
|
||||
DriveType = DOSDEVICE_DRIVE_REMOVABLE;
|
||||
else
|
||||
DriveType = DOSDEVICE_DRIVE_FIXED;
|
||||
break;
|
||||
case FILE_DEVICE_NETWORK:
|
||||
case FILE_DEVICE_NETWORK_FILE_SYSTEM:
|
||||
DriveType = DOSDEVICE_DRIVE_REMOTE;
|
||||
break;
|
||||
default:
|
||||
DPRINT1("Device Type %lu for %wZ is not known or unhandled\n",
|
||||
((PDEVICE_OBJECT)Object)->DeviceType,
|
||||
&SymbolicLink->LinkTarget);
|
||||
DriveType = DOSDEVICE_DRIVE_UNKNOWN;
|
||||
UpperDrive = RtlUpcaseUnicodeChar(ObjectNameInfo->Name.Buffer[0]);
|
||||
if (UpperDrive >= L'A' && UpperDrive <= L'Z')
|
||||
{
|
||||
/* Compute its index (it's 1 based - 0 means no letter) */
|
||||
SymbolicLink->DosDeviceDriveIndex = UpperDrive - (L'A' - 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Add a new drive entry */
|
||||
KeAcquireGuardedMutex(&ObpDeviceMapLock);
|
||||
ObSystemDeviceMap->DriveType[SymbolicLink->DosDeviceDriveIndex-1] =
|
||||
(UCHAR)DriveType;
|
||||
ObSystemDeviceMap->DriveMap |=
|
||||
1 << (SymbolicLink->DosDeviceDriveIndex-1);
|
||||
KeReleaseGuardedMutex(&ObpDeviceMapLock);
|
||||
/* Call the helper */
|
||||
ObpProcessDosDeviceSymbolicLink(SymbolicLink, FALSE);
|
||||
}
|
||||
|
||||
/* Cleanup */
|
||||
/* We're done */
|
||||
ObpDereferenceNameInfo(ObjectNameInfo);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue