[tfaber] 56950: [NPFS] - Keep a reference count for FCBs to prevent race conditions when closing multiple handles to the same pipe concurrently - Acquire the pipe list lock in NpfsQueryDirectory to...
23 Jul
2012
23 Jul
'12
1:24 p.m.
Author: tfaber
Date: Mon Jul 23 13:24:48 2012
New Revision: 56950
URL: http://svn.reactos.org/svn/reactos?rev=56950&view=rev
Log:
[NPFS]
- Keep a reference count for FCBs to prevent race conditions when closing multiple handles
to the same pipe concurrently
- Acquire the pipe list lock in NpfsQueryDirectory to guard against concurrent deletion of
pipes
See issue #7205 for more details.
Modified:
trunk/reactos/drivers/filesystems/npfs/create.c
trunk/reactos/drivers/filesystems/npfs/dirctl.c
trunk/reactos/drivers/filesystems/npfs/fsctrl.c
trunk/reactos/drivers/filesystems/npfs/npfs.c
trunk/reactos/drivers/filesystems/npfs/npfs.h
Modified: trunk/reactos/drivers/filesystems/npfs/create.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/npfs/c…
==============================================================================
--- trunk/reactos/drivers/filesystems/npfs/create.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/npfs/create.c [iso-8859-1] Mon Jul 23 13:24:48 2012
@@ -17,17 +17,20 @@
/* FUNCTIONS *****************************************************************/
-static
VOID
-NpfsDeleteFcb(PNPFS_FCB Fcb)
+NpfsDereferenceFcb(PNPFS_FCB Fcb)
{
PNPFS_VCB Vcb = Fcb->Vcb;
KeLockMutex(&Vcb->PipeListLock);
- RemoveEntryList(&Fcb->PipeListEntry);
+ if (InterlockedDecrement(&Fcb->RefCount) == 0)
+ {
+ DPRINT("NpfsDereferenceFcb. Deleting %p\n", Fcb);
+ RemoveEntryList(&Fcb->PipeListEntry);
+ RtlFreeUnicodeString(&Fcb->PipeName);
+ ExFreePoolWithTag(Fcb, TAG_NPFS_FCB);
+ }
KeUnlockMutex(&Vcb->PipeListLock);
- RtlFreeUnicodeString(&Fcb->PipeName);
- ExFreePoolWithTag(Fcb, TAG_NPFS_FCB);
}
static
@@ -103,6 +106,7 @@
TRUE) == 0)
{
DPRINT("<%wZ> = <%wZ>\n", PipeName,
&Fcb->PipeName);
+ (VOID)InterlockedIncrement(&Fcb->RefCount);
return Fcb;
}
@@ -337,6 +341,7 @@
{
DPRINT("No memory!\n");
KeUnlockMutex(&Fcb->CcbListLock);
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_NO_MEMORY;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NO_MEMORY;
@@ -365,6 +370,7 @@
DPRINT("No memory!\n");
NpfsDereferenceCcb(ClientCcb);
KeUnlockMutex(&Fcb->CcbListLock);
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_NO_MEMORY;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NO_MEMORY;
@@ -437,6 +443,7 @@
NpfsDereferenceCcb(ClientCcb);
KeUnlockMutex(&Fcb->CcbListLock);
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_OBJECT_PATH_NOT_FOUND;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_OBJECT_PATH_NOT_FOUND;
@@ -460,8 +467,8 @@
}
NpfsDereferenceCcb(ClientCcb);
-
KeUnlockMutex(&Fcb->CcbListLock);
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_UNSUCCESSFUL;
@@ -510,7 +517,6 @@
PNPFS_FCB Fcb;
PNPFS_CCB Ccb;
PNAMED_PIPE_CREATE_PARAMETERS Buffer;
- BOOLEAN NewPipe = FALSE;
DPRINT("NpfsCreateNamedPipe(DeviceObject %p Irp %p)\n", DeviceObject,
Irp);
@@ -549,6 +555,7 @@
if (Fcb->CurrentInstances >= Fcb->MaximumInstances)
{
DPRINT("Out of instances.\n");
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_INSTANCE_NOT_AVAILABLE;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_INSTANCE_NOT_AVAILABLE;
@@ -559,6 +566,7 @@
Fcb->PipeType != Buffer->NamedPipeType)
{
DPRINT("Asked for invalid pipe mode.\n");
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_ACCESS_DENIED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_ACCESS_DENIED;
@@ -566,7 +574,6 @@
}
else
{
- NewPipe = TRUE;
Fcb = ExAllocatePoolWithTag(NonPagedPool, sizeof(NPFS_FCB), TAG_NPFS_FCB);
if (Fcb == NULL)
{
@@ -579,6 +586,7 @@
Fcb->Type = FCB_PIPE;
Fcb->Vcb = Vcb;
+ Fcb->RefCount = 1;
Fcb->PipeName.Length = FileObject->FileName.Length;
Fcb->PipeName.MaximumLength = Fcb->PipeName.Length + sizeof(UNICODE_NULL);
Fcb->PipeName.Buffer = ExAllocatePoolWithTag(NonPagedPool,
@@ -678,11 +686,7 @@
Ccb = NpfsAllocateCcb(CCB_PIPE, Fcb);
if (Ccb == NULL)
{
- if (NewPipe)
- {
- NpfsDeleteFcb(Fcb);
- }
-
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_NO_MEMORY;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NO_MEMORY;
@@ -698,11 +702,7 @@
if (Ccb->Data == NULL)
{
NpfsDereferenceCcb(Ccb);
-
- if (NewPipe)
- {
- NpfsDeleteFcb(Fcb);
- }
+ NpfsDereferenceFcb(Fcb);
Irp->IoStatus.Status = STATUS_NO_MEMORY;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
@@ -1004,12 +1004,8 @@
KeUnlockMutex(&Fcb->CcbListLock);
- if (IsListEmpty(&Fcb->ServerCcbListHead) &&
- IsListEmpty(&Fcb->ClientCcbListHead))
- {
- NpfsDeleteFcb(Fcb);
- FileObject->FsContext = NULL;
- }
+ NpfsDereferenceFcb(Fcb);
+ FileObject->FsContext = NULL;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
Modified: trunk/reactos/drivers/filesystems/npfs/dirctl.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/npfs/d…
==============================================================================
--- trunk/reactos/drivers/filesystems/npfs/dirctl.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/npfs/dirctl.c [iso-8859-1] Mon Jul 23 13:24:48 2012
@@ -144,6 +144,7 @@
PipeIndex = 0;
Vcb = Ccb->Fcb->Vcb;
+ KeLockMutex(&Vcb->PipeListLock);
CurrentEntry = Vcb->PipeListHead.Flink;
while (CurrentEntry != &Vcb->PipeListHead &&
Status == STATUS_SUCCESS)
@@ -252,11 +253,17 @@
/* Leave, if there is no space left in the buffer */
if (Status == STATUS_BUFFER_OVERFLOW)
+ {
+ KeUnlockMutex(&Vcb->PipeListLock);
return Status;
+ }
/* Leave, if we should return only one entry */
if (Stack->Flags & SL_RETURN_SINGLE_ENTRY)
+ {
+ KeUnlockMutex(&Vcb->PipeListLock);
return STATUS_SUCCESS;
+ }
/* Store the current offset for the next round */
LastOffset = CurrentOffset;
@@ -270,6 +277,7 @@
CurrentEntry = CurrentEntry->Flink;
}
+ KeUnlockMutex(&Vcb->PipeListLock);
/* Return STATUS_NO_MORE_FILES if no matching pipe name was found */
if (CurrentOffset == 0)
Modified: trunk/reactos/drivers/filesystems/npfs/fsctrl.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/npfs/f…
==============================================================================
--- trunk/reactos/drivers/filesystems/npfs/fsctrl.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/npfs/fsctrl.c [iso-8859-1] Mon Jul 23 13:24:48 2012
@@ -375,7 +375,7 @@
{
/* found a listening server CCB */
DPRINT("Listening server CCB found -- connecting\n");
-
+ NpfsDereferenceFcb(Fcb);
return STATUS_SUCCESS;
}
@@ -402,6 +402,7 @@
/* Wait forever */
TimeOut = NULL;
}
+ NpfsDereferenceFcb(Fcb);
Status = KeWaitForSingleObject(&Ccb->ConnectEvent,
UserRequest,
@@ -507,7 +508,9 @@
{
/* found a listening server CCB */
DPRINT("Listening server CCB found -- connecting\n");
-
+#ifdef USING_PROPER_NPFS_WAIT_SEMANTICS
+ NpfsDereferenceFcb(Fcb);
+#endif
return STATUS_SUCCESS;
}
@@ -521,6 +524,9 @@
TimeOut = WaitPipe->Timeout;
else
TimeOut = Fcb->TimeOut;
+#ifdef USING_PROPER_NPFS_WAIT_SEMANTICS
+ NpfsDereferenceFcb(Fcb);
+#endif
/* Wait for one */
Status = KeWaitForSingleObject(&Ccb->ConnectEvent,
Modified: trunk/reactos/drivers/filesystems/npfs/npfs.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/npfs/n…
==============================================================================
--- trunk/reactos/drivers/filesystems/npfs/npfs.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/npfs/npfs.c [iso-8859-1] Mon Jul 23 13:24:48 2012
@@ -89,12 +89,14 @@
Fcb = ExAllocatePoolWithTag(NonPagedPool, sizeof(NPFS_FCB), TAG_NPFS_FCB);
Fcb->Type = FCB_DEVICE;
Fcb->Vcb = Vcb;
+ Fcb->RefCount = 1;
Vcb->DeviceFcb = Fcb;
/* Create the root directory FCB */
Fcb = ExAllocatePoolWithTag(NonPagedPool, sizeof(NPFS_FCB), TAG_NPFS_FCB);
Fcb->Type = FCB_DIRECTORY;
Fcb->Vcb = Vcb;
+ Fcb->RefCount = 1;
Vcb->RootFcb = Fcb;
return STATUS_SUCCESS;
Modified: trunk/reactos/drivers/filesystems/npfs/npfs.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/npfs/n…
==============================================================================
--- trunk/reactos/drivers/filesystems/npfs/npfs.h [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/npfs/npfs.h [iso-8859-1] Mon Jul 23 13:24:48 2012
@@ -51,6 +51,7 @@
{
FCB_TYPE Type;
PNPFS_VCB Vcb;
+ volatile LONG RefCount;
UNICODE_STRING PipeName;
LIST_ENTRY PipeListEntry;
KMUTEX CcbListLock;
@@ -83,8 +84,7 @@
LIST_ENTRY CcbListEntry;
CCB_TYPE Type;
PNPFS_FCB Fcb;
-
- PFILE_OBJECT FileObject;
+ PFILE_OBJECT FileObject;
struct _NPFS_CCB* OtherSide;
struct ETHREAD *Thread;
@@ -190,6 +190,9 @@
DriverEntry(PDRIVER_OBJECT DriverObject,
PUNICODE_STRING RegistryPath);
+VOID
+NpfsDereferenceFcb(PNPFS_FCB Fcb);
+
PNPFS_FCB
NpfsFindPipe(PNPFS_VCB Vcb,
PUNICODE_STRING PipeName);
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