Re: [PATCH RFC 4/4] tpm: add the infrastructure for TPM space for TPM 2.0

[Jason Gunthorpe]

On Tue, Jan 03, 2017 at 02:37:30AM +0200, Jarkko Sakkinen wrote:
> On Mon, Jan 02, 2017 at 02:09:53PM -0700, Jason Gunthorpe wrote:
> > On Mon, Jan 02, 2017 at 03:22:10PM +0200, Jarkko Sakkinen wrote:
> > > Added a ioctl for creating a TPM space. The space is isolated from the
> > > other users of the TPM. Only a process holding the file with the handle
> > > can access the objects and only objects that are created through that
> > > file handle can be accessed.
> > 
> > I don't understand this comment. /dev/tpmX is forced to be
> > single-process-open, so how can there ever be more than 1 FD for it?
> > 
> > Since the space is tied to that single fd these patches just create a
> > way for the single user-space process to auto-cleanup if it crashes?
> > 
> > Is that the entire intent of this design? I guess it is OK as a
> > stepping point..
> 
> is_open is cleared in tpm_ioc_new_space.

There is also a bug with the uncondtional clear of is_open in
tpm_release - this cannot happen if the ioctl is done - but I think
this approach of using an ioctl is not a good idea.

I have pondered using an open flag in the past - what about using
something like O_EXCL to indicate that the fd is to be used in
resource sharing mode? Not sure if that would be considered abuse of
the open flags or not.

Jason