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dll: fuse: properly acquire op guard for reparse point operations

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This commit is contained in:
Bill Zissimopoulos
2016-09-09 11:43:49 -07:00
parent 28a20d5199
commit 46ce4b1a6c
1 changed files with 86 additions and 4 deletions
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90
src/dll/fuse/fuse_intf.c
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@@ -17,6 +17,90 @@
#include <dll/fuse/library.h>
static inline
VOID fsp_fuse_op_enter_lock(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
{
switch (FileSystem->OpGuardStrategy)
{
case FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_FINE:
if ((FspFsctlTransactCreateKind == Request->Kind &&
FILE_OPEN != ((Request->Req.Create.CreateOptions >> 24) & 0xff)) ||
(FspFsctlTransactCleanupKind == Request->Kind &&
Request->Req.Cleanup.Delete) ||
(FspFsctlTransactSetInformationKind == Request->Kind &&
10/*FileRenameInformation*/ == Request->Req.SetInformation.FileInformationClass) ||
FspFsctlTransactSetVolumeInformationKind == Request->Kind ||
(FspFsctlTransactFlushBuffersKind == Request->Kind &&
0 == Request->Req.FlushBuffers.UserContext) ||
/* FSCTL_SET_REPARSE_POINT manipulates namespace */
(FspFsctlTransactFileSystemControlKind == Request->Kind &&
FSCTL_SET_REPARSE_POINT == Request->Req.FileSystemControl.FsControlCode))
{
AcquireSRWLockExclusive(&FileSystem->OpGuardLock);
}
else
if (FspFsctlTransactCreateKind == Request->Kind ||
(FspFsctlTransactSetInformationKind == Request->Kind &&
13/*FileDispositionInformation*/ == Request->Req.SetInformation.FileInformationClass) ||
FspFsctlTransactQueryDirectoryKind == Request->Kind ||
FspFsctlTransactQueryVolumeInformationKind == Request->Kind ||
/* FSCTL_GET_REPARSE_POINT may access namespace */
(FspFsctlTransactFileSystemControlKind == Request->Kind &&
FSCTL_GET_REPARSE_POINT == Request->Req.FileSystemControl.FsControlCode))
{
AcquireSRWLockShared(&FileSystem->OpGuardLock);
}
break;
case FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_COARSE:
AcquireSRWLockExclusive(&FileSystem->OpGuardLock);
break;
}
}
static inline
VOID fsp_fuse_op_leave_unlock(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
{
switch (FileSystem->OpGuardStrategy)
{
case FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_FINE:
if ((FspFsctlTransactCreateKind == Request->Kind &&
FILE_OPEN != ((Request->Req.Create.CreateOptions >> 24) & 0xff)) ||
(FspFsctlTransactCleanupKind == Request->Kind &&
Request->Req.Cleanup.Delete) ||
(FspFsctlTransactSetInformationKind == Request->Kind &&
10/*FileRenameInformation*/ == Request->Req.SetInformation.FileInformationClass) ||
FspFsctlTransactSetVolumeInformationKind == Request->Kind ||
(FspFsctlTransactFlushBuffersKind == Request->Kind &&
0 == Request->Req.FlushBuffers.UserContext) ||
/* FSCTL_SET_REPARSE_POINT manipulates namespace */
(FspFsctlTransactFileSystemControlKind == Request->Kind &&
FSCTL_SET_REPARSE_POINT == Request->Req.FileSystemControl.FsControlCode))
{
ReleaseSRWLockExclusive(&FileSystem->OpGuardLock);
}
else
if (FspFsctlTransactCreateKind == Request->Kind ||
(FspFsctlTransactSetInformationKind == Request->Kind &&
13/*FileDispositionInformation*/ == Request->Req.SetInformation.FileInformationClass) ||
FspFsctlTransactQueryDirectoryKind == Request->Kind ||
FspFsctlTransactQueryVolumeInformationKind == Request->Kind ||
/* FSCTL_GET_REPARSE_POINT may access namespace */
(FspFsctlTransactFileSystemControlKind == Request->Kind &&
FSCTL_GET_REPARSE_POINT == Request->Req.FileSystemControl.FsControlCode))
{
ReleaseSRWLockShared(&FileSystem->OpGuardLock);
}
break;
case FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_COARSE:
ReleaseSRWLockExclusive(&FileSystem->OpGuardLock);
break;
}
}
NTSTATUS fsp_fuse_op_enter(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response)
{
@@ -131,9 +215,7 @@ NTSTATUS fsp_fuse_op_enter(FSP_FILE_SYSTEM *FileSystem,
goto exit;
}
Result = FspFileSystemOpEnter(FileSystem, Request, Response);
if (!NT_SUCCESS(Result))
goto exit;
fsp_fuse_op_enter_lock(FileSystem, Request, Response);
context->fuse = f;
context->private_data = f->data;
@@ -167,7 +249,7 @@ NTSTATUS fsp_fuse_op_leave(FSP_FILE_SYSTEM *FileSystem,
struct fuse_context *context;
struct fsp_fuse_context_header *contexthdr;
FspFileSystemOpLeave(FileSystem, Request, Response);
fsp_fuse_op_leave_unlock(FileSystem, Request, Response);
context = fsp_fuse_get_context(f->env);
context->fuse = 0;