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sys: FSP_FSCTL_VOLUME_PARAMS

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This commit is contained in:
Bill Zissimopoulos
2015-11-28 17:14:11 -08:00
parent d724b3a307
commit 76af18e4d0
4 changed files with 32 additions and 15 deletions
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1
src/sys/driver.h
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@ -253,6 +253,7 @@ typedef struct
typedef struct
{
FSP_DEVICE_EXTENSION Base;
FSP_FSCTL_VOLUME_PARAMS VolumeParams;
FSP_IOQ Ioq;
UINT8 SecurityDescriptorBuf[];
} FSP_FSVRT_DEVICE_EXTENSION;

20
src/sys/fsctl.c
View File

@ -44,8 +44,11 @@ static NTSTATUS FspFsctlCreateVolume(
ULONG InputBufferLength = IrpSp->Parameters.FileSystemControl.InputBufferLength;
ULONG OutputBufferLength = IrpSp->Parameters.FileSystemControl.OutputBufferLength;
PVOID SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
if (0 == InputBufferLength || 0 == SystemBuffer ||
!RtlValidRelativeSecurityDescriptor(SystemBuffer, InputBufferLength,
const FSP_FSCTL_VOLUME_PARAMS *Params = SystemBuffer;
PSECURITY_DESCRIPTOR SecurityDescriptor = (PVOID)(Params + 1);
DWORD SecurityDescriptorSize = InputBufferLength - sizeof *Params;
if (sizeof *Params >= InputBufferLength || 0 == SystemBuffer ||
!RtlValidRelativeSecurityDescriptor(SecurityDescriptor, SecurityDescriptorSize,
OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION))
return STATUS_INVALID_PARAMETER;
if (FSP_FSCTL_CREATE_BUFFER_SIZE > OutputBufferLength)
@ -60,10 +63,10 @@ static NTSTATUS FspFsctlCreateVolume(
return Result;
/* copy the security descriptor from the system buffer to a temporary one */
PVOID SecurityDescriptor = ExAllocatePoolWithTag(PagedPool, InputBufferLength, FSP_TAG);
if (0 == SecurityDescriptor)
PVOID SecurityDescriptorBuf = ExAllocatePoolWithTag(PagedPool, SecurityDescriptorSize, FSP_TAG);
if (0 == SecurityDescriptorBuf)
return STATUS_INSUFFICIENT_RESOURCES;
RtlCopyMemory(SecurityDescriptor, SystemBuffer, InputBufferLength);
RtlCopyMemory(SecurityDescriptorBuf, SecurityDescriptor, SecurityDescriptorSize);
/* create the virtual volume device */
PDEVICE_OBJECT FsvrtDeviceObject;
@ -78,7 +81,7 @@ static NTSTATUS FspFsctlCreateVolume(
Guid.Data4[4], Guid.Data4[5], Guid.Data4[6], Guid.Data4[7]);
ASSERT(NT_SUCCESS(Result));
Result = IoCreateDeviceSecure(DeviceObject->DriverObject,
sizeof(FSP_FSVRT_DEVICE_EXTENSION) + InputBufferLength, &DeviceName, FILE_DEVICE_VIRTUAL_DISK,
sizeof(FSP_FSVRT_DEVICE_EXTENSION) + SecurityDescriptorSize, &DeviceName, FILE_DEVICE_VIRTUAL_DISK,
FILE_DEVICE_SECURE_OPEN, FALSE,
&DeviceSddl, 0,
&FsvrtDeviceObject);
@ -86,14 +89,15 @@ static NTSTATUS FspFsctlCreateVolume(
{
FSP_FSVRT_DEVICE_EXTENSION *FsvrtDeviceExtension = FspFsvrtDeviceExtension(FsvrtDeviceObject);
FsvrtDeviceExtension->Base.Kind = FspFsvrtDeviceExtensionKind;
FsvrtDeviceExtension->VolumeParams = *Params;
FspIoqInitialize(&FsvrtDeviceExtension->Ioq);
RtlCopyMemory(FspFsvrtDeviceExtension(FsvrtDeviceObject)->SecurityDescriptorBuf,
SecurityDescriptor, InputBufferLength);
SecurityDescriptorBuf, SecurityDescriptorSize);
Irp->IoStatus.Information = DeviceName.Length + 1;
}
/* free the temporary security descriptor */
ExFreePoolWithTag(SecurityDescriptor, FSP_TAG);
ExFreePoolWithTag(SecurityDescriptorBuf, FSP_TAG);
return Result;
}